EP4288839A1 - Procédé de fabrication d'un élément optique, appareil de fabrication d'un élément optique, élément optique et système de lithographie - Google Patents

Procédé de fabrication d'un élément optique, appareil de fabrication d'un élément optique, élément optique et système de lithographie

Info

Publication number
EP4288839A1
EP4288839A1 EP22703354.5A EP22703354A EP4288839A1 EP 4288839 A1 EP4288839 A1 EP 4288839A1 EP 22703354 A EP22703354 A EP 22703354A EP 4288839 A1 EP4288839 A1 EP 4288839A1
Authority
EP
European Patent Office
Prior art keywords
initial surface
processing
starting
vacuum environment
optical element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22703354.5A
Other languages
German (de)
English (en)
Inventor
Sebastian Strobel
Vitaliy Shklover
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Zeiss SMT GmbH
Original Assignee
Carl Zeiss SMT GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Zeiss SMT GmbH filed Critical Carl Zeiss SMT GmbH
Publication of EP4288839A1 publication Critical patent/EP4288839A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
    • G03F7/7095—Materials, e.g. materials for housing, stage or other support having particular properties, e.g. weight, strength, conductivity, thermal expansion coefficient
    • G03F7/70958—Optical materials or coatings, e.g. with particular transmittance, reflectance or anti-reflection properties
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/02—Pretreatment of the material to be coated
    • C23C14/021—Cleaning or etching treatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/52—Means for observation of the coating process
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
    • C23C14/564—Means for minimising impurities in the coating chamber such as dust, moisture, residual gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/94—Investigating contamination, e.g. dust

Definitions

  • the invention relates to a method for producing an optical element for a lithography system, the method being carried out outside of the lithography system in which the optical element is used, after which an initial surface of a base body, in particular an occurrence of foreign bodies on the initial surface, before a machining process is inspected and/or characterized and/or cleaned and from this a qualification of the original surface for the following processing method is determined.
  • the invention also relates to a device for producing an optical element for a lithography system, the optical element being formed from a base body with an initial surface, the device being spatially and functionally separate from the lithography system in which the optical element is used, having a processing device for processing the initial surface and a data acquisition device for inspecting and/or characterizing a surface condition of the initial surface, in particular the presence of foreign bodies on the initial surface, and/or a cleaning device for cleaning the initial surface, with a determination of a qualification of the initial surface for processing based on the inspection and/or characterization and/or cleaning by means of the processing device.
  • the invention also relates to an optical element, in particular a mirror.
  • the invention relates to a lithography system, in particular a projection exposure system for microlithography with an illumination system and illumination optics, which has at least one optical element.
  • optical elements influence the properties of light waves interacting with them. Precise surface processing of the optical elements is necessary to avoid undesirable structures in the resulting wave fronts.
  • optical elements that can be mentioned are planar mirrors, concave mirrors, convex mirrors, facet mirrors, convex lenses, concave lenses, convex-concave lenses, plano-convex lenses and plano-concave lenses. Glass and silicon, among others, are known as materials for optical elements, in particular mirrors.
  • Projection exposure systems have a large number of optical elements.
  • the nature of the optical elements is of particular importance when using the optical elements in a microlithographic DUV (Deep Ultra Violet) projection exposure system and especially when used in a microlithographic EUV (Extreme Ultra Violet) projection exposure system.
  • the optical elements are exposed to a large number of damaging influences which can deteriorate their condition, since the light modulated by the optical elements, for example an EUV mirror, has a very small wavelength and the resulting wave fronts do be disturbed by the slightest impairment of the condition of the optical element.
  • the structures shown on the projection surface are very small and therefore also susceptible to the slightest change in the nature of the optical element.
  • the damaging influences that can affect the optical element before and during its production include, for example, foreign bodies adhering to the surface of a substrate, which can impede surface processing.
  • optical elements can be formed from a substrate which is coated with a reflective layer system, for example. If foreign bodies adhere to the substrate before the coating is applied, this can result in faulty formation of the coating.
  • a disadvantage of the cleaning methods known from the prior art is that the substrate can again become contaminated with foreign bodies after the cleaning has been completed. Accordingly, it is disadvantageous that it is not ensured that the substrate is qualified for the coating process at the beginning of a coating process, since new contamination can occur between the determination of the qualification, for example by cleaning, and the processing. This can lead to defective formation of the coating.
  • the present invention is based on the object of creating a method for producing an optical element for a lithography system which avoids the disadvantages of the prior art, in particular ensuring suitable qualification of the initial surface of a base body for a subsequent processing method.
  • this object is achieved by a method for producing an optical element for a lithography system, according to which the method is carried out outside the lithography system in which the optical element is used, after which an initial surface of a base body, in particular an occurrence of foreign bodies on the initial surface, is inspected and/or characterized and/or cleaned prior to a machining process and from this a qualification of the initial surface for the subsequent machining process is determined, with the initial surface from a point in time at the latest immediately after the determination of the qualification of the initial surface at least up to the conclusion of the machining process under one continuous vacuum environment.
  • the present invention is also based on the object of creating a device for producing an optical element for a lithography system which avoids the disadvantages of the prior art, in particular ensuring suitable qualification of the initial surface of a base body for a subsequent processing method.
  • this object is achieved by a device for producing an optical element for a lithography system, the device being spatially and functionally separate from the lithography system in which the optical element is used, and the optical element being formed from a base body with an initial surface , wherein the device has a processing device for processing the initial surface and a data acquisition device for inspecting and/or characterizing a surface condition of the initial surface, in particular the presence of foreign bodies on the initial surface, and/or a cleaning device for cleaning the initial surface, with a determination of a qualification of the Output surface for processing by means of the processing device based on the inspection and / or characterization and / or cleaning, and a vacuum device for generating a continuous vacuum environment is provided to maintain the initial surface under a continuous vacuum environment from no later than immediately after the determination of the qualification of the initial surface at least until a completion of the processing by the processing device.
  • the present invention is also based on the object of creating an optical element which avoids the disadvantages of the prior art, in particular having a precisely and undisturbedly machined surface.
  • this object is achieved by an optical element, in particular a mirror, which is at least partially produced using the method according to the invention and/or at least partially using the device according to the invention.
  • the present invention is also based on the object of creating a lithography system which avoids the disadvantages of the prior art and in particular enables optical imaging that is as exact as possible.
  • this object is achieved by a lithography system, in particular a projection exposure system for microlithography, with an illumination system that has a radiation source, illumination optics and projection optics, the illumination optics and/or the projection optics having at least one optical element, which at least partially is produced using the method according to the invention and/or at least one of the optical elements is produced using the device according to the invention and/or at least one of the optical elements is an optical element according to the invention.
  • an initial surface of a base body in particular an occurrence of foreign bodies on the initial surface, is Machining processes inspected and/or characterized and/or cleaned. From this, a qualification of the starting surface for the following machining process is determined.
  • the initial surface is kept under a continuous vacuum environment from a point in time at the latest immediately after the determination of the qualification of the initial surface at least until the beginning of the machining process.
  • optical element is to be understood in particular as a use in a projection exposure system for microlithography for the exposure of wafers for the semiconductor industry.
  • the lithography system in which the optical element is used can in particular be a projection exposure system for microlithography for the exposure of wafers for the semiconductor industry.
  • the optical element can be any functional element in a beam path.
  • the optical elements within the scope of the invention can be, for example, lenses and/or mirrors and/or masks and/or wafer inspection systems and/or optical circuits and/or holograms, in particular computer-generated holograms and/or micro-optics and/or optical ones Act memory and / or optoelectronic elements and / or photolithographic pellicles and / or acousto-optical elements and / or magneto-optical elements and / or electro-optical elements.
  • an inspection or inspection of the initial surface is understood to mean the acquisition of data about the initial surface with regard to specifications and a comparison of the data acquired with the specifications.
  • a characterization of the initial surface means the collection of data about the initial surface, which can include information other than that which is collected for comparison with specifications as part of the inspection, the comparison of the data collected with the specifications can be omitted.
  • the starting surface is to be understood as a polished and/or cleaned and/or structured, in particular microstructured and/or etched, in particular ion beam-etched and/or machined and/or partially machined surface of the base body, which is supplied to the machining process target.
  • a continuous vacuum environment designates a vacuum environment that is formed without any spatial and/or temporal interruption. In its spatial and/or temporal profile, the continuous vacuum environment has at least approximately constant and/or uniform and/or similar properties.
  • Continuous environmental conditions denote environmental conditions, in particular vacuum conditions, which are formed without spatial and/or temporal interruptions.
  • the continuous environmental conditions, in particular vacuum conditions have at least approximately constant and/or uniform and/or similar properties in their spatial and/or temporal progression.
  • the initial surface is kept under a continuous vacuum environment at the latest from a point in time at which a qualification or suitability of the initial surface for the subsequent machining process is determined, at least until the end of the subsequent machining process, foreign bodies and/or other Disturbances of the initial surface between the determination of the qualification and the start of the machining process are avoided.
  • a suitable qualification for the machining process can be ensured and, for example, it can be avoided that, for example, foreign bodies prevent the formation of a precisely and undisturbed machined surface.
  • a vacuum environment is particularly advantageous because foreign bodies, for example dirt particles and/or dust particles, sediment immediately and quickly in the absence of a buoyancy force caused by the vacuum.
  • the starting surface is suitably oriented in space, in particular pointing in the direction of gravity, particles or foreign bodies falling from above and almost exclusively following the force of gravity in the vacuum environment cannot reach the starting surface.
  • the vacuum environment is continuous, so that the initial surface is not subjected to any new and/or repeated evacuation cycles or is removed from a vacuum environment and a new vacuum environment between the determination of the qualification and the start of the machining process is supplied, whereby the vacuum environment would be interrupted and not continuous.
  • foreign objects such as z. B. dirt particles are whirled up and thus entered on the output surface.
  • the initial surface can also be qualified by cleaning, provided that the cleaning leads with sufficient certainty to the suitability of the surface for the subsequent processing method.
  • cleaning removes 99.99% of all foreign bodies on the initial surface and no further foreign bodies are introduced by the cleaning. If this is proven, e.g. by tests, the completion of the cleaning can be regarded as a sufficient determination of the qualification of the original surface.
  • An inspection and/or a characterization and a cleaning are preferably provided for the qualification of the initial surface.
  • the initial surface is kept under the continuous vacuum environment at least until the machining method is completed.
  • the vacuum environment is a high-vacuum environment.
  • a high-vacuum environment is particularly advantageous, since foreign bodies, in particular dirt particles and/or dust particles, settle quickly in the environment. Likewise, fewer foreign bodies and/or dirt particles are whirled up by a buoyancy force that is advantageously reduced compared to a simple vacuum environment.
  • the initial surface is kept under the continuous vacuum environment from a point in time at the latest while it is being inspected and/or characterized and/or cleaned, at least until the processing method is completed.
  • qualification of the initial surface is determined by inspection and/or characterization and/or cleaning, it is advantageous if those processes which lead to a determination of the qualification of the initial surface, in particular the inspection process and/or the characterization process and the cleaning process, are the continuous vacuum environment. In this way, the entry of foreign bodies can already be ruled out during the ongoing qualification process.
  • a geometric contour of the initial surface, in particular the presence of foreign bodies is measured using an optical and/or mechanical and/or electrical and/or acoustic measuring method, in particular using static light scattering (SLS) and /or interferometry and/or light microscopy and/or atomic force microscopy and/or scanning tunneling microscopy and/or scanning electron microscopy and/or scanning transmission electron microscopy and/or transmission electron microscopy and/or a measuring method for surface acoustic waves and/or is inspected and/or characterized.
  • SLS static light scattering
  • the geometric contour of the initial surface can provide information about the presence of foreign bodies on the initial surface, for example. For example, an abrupt elevation on the initial surface that deviates greatly from the surrounding initial surface can indicate a foreign body on the initial surface.
  • a sharp cut unexpected from the vicinity of the original surface may indicate a manufacturing defect of the original surface itself.
  • the measurement methods mentioned represent measurement methods known from the prior art which are particularly suitable for use within the scope of the method according to the invention.
  • the measurement methods work in a robust and precise manner and thus allow a robust and precise inspection and/or characterization of the geometric contour of the initial surface.
  • a material composition of the initial surface is analyzed by means of a measurement method, in particular by means of a fluorescence measurement and/or X-ray photoelectron spectroscopy and/or spectroscopy, in particular a Fourier transformation - Infrared spectroscopy and/or an Auger electron spectroscopy, and/or an X-ray measurement.
  • An analysis of the material composition of the initial surface can be of particular advantage, since it can be distinguished, for example, whether there are substances on the initial surface that do not consist of and/or contain the material forming the initial surface.
  • measures adapted to the determined material composition can be taken, which work towards a determination of the qualification.
  • the starting surface is cleaned by sucking and/or blowing off and/or adhesively removing and/or vaporizing and/or crushing and/or etching away and/or, in particular, the foreign bodies from the starting surface visually, to be captured.
  • the initial surface is determined as a function of the inspection process and/or the characterization process Information regarding a geometric contour and / or the material composition of the initial surface is cleaned. Within the scope of the invention, the cleaning can also be carried out without prior inspection and/or characterization.
  • Foreign bodies on the initial surface can, for example, be mechanically and/or kinetically suctioned off and/or blown off and/or adhesively removed using a suitable adhesive. Furthermore, a harmful influence of foreign bodies can also be reduced by their thermal and/or chemical decomposition and comminution.
  • a jet of particles directed at the foreign body is introduced into the vacuum environment.
  • the foreign body can be removed from the starting surface by the action of the gas particles, for example by momentum transmission.
  • the particles can have a high speed, as a result of which the number of particles to achieve a specific momentum transfer can be reduced.
  • the gas particles can be electrically charged in a targeted manner and/or brought to the same potential as the initial surface.
  • the particles can advantageously be formed in such a way that the particles themselves do not cause any contamination and/or chemical reactions with the substrate.
  • the particles are atoms of a noble gas.
  • the initial surface can preferably be cleaned on the basis of the data recorded in the inspection and/or the characterization and thus qualified for the subsequent processing method.
  • the initial surface is changed by means of a change method before the qualification is determined.
  • the original surface is inspected and/or characterized and/or independent of the presence of foreign bodies in terms of its nature, in particular with regard to chemical properties and/or electrical and/or impurities and/or the extent of a chemically modified layer, for example an oxide layer cleaned and/or altered without disrupting the continuous vacuum environment.
  • a characterization and/or an inspection of the form of the chemically modified layer can be provided in particular with regard to its absence and/or its local differences and/or its incomplete formation, for example in the form of holes.
  • the determination of the qualification is automated and/or semi-automated and/or manual, based on predefined rules and/or comparative data and/or references, and/or by means of image recognition methods and/or based on simulations and/or models.
  • a simulation can be provided in order to determine an effect of the error on the subsequent processing.
  • the error can then be corrected by the modification method, for example, or the production of the optical element can be terminated.
  • a probability of success of the correction of the error by the modification method can be determined, for example, by means of a suitable simulation. Depending on the probability of success, the correction can be initiated or the production can be aborted.
  • an effect of a correction to be made to the error can be determined, for example, by means of a suitable simulation. If, for example, the corrected error also has a negative effect on the optical properties, production can be stopped.
  • defects are known on the original surface, it can be advantageous to include this prior knowledge in determining the qualification. For example, a previously known defect can be ignored if it is formed in an optically less relevant area of the optical element.
  • a lateral structure preferably conductor tracks and/or grids, and/or a topography is formed and/or inspected and/or characterized and/or cleaned and/or changed on the initial surface.
  • the initial surface can have functional structures, the correct form of which must be checked before the machining process begins. This testing can be done as part of the inspection and characterization of the original surface. Furthermore, as part of the modification process, the initial surface can be modified in such a way that after the modification process the initial surface has the functional structures as part of the initial surface and/or that already existing functional structures are modified and/or cleaned.
  • the functional structures in particular conductor tracks and/or grids, are to be understood here as part of the initial surface.
  • the topography present and/or applied on the initial surface is changed by removing steps from side surfaces and/or sharpening and/or rounding edges in order to produce preferably continuous surfaces.
  • upper and/or lower edges for example of webs and/or lateral structuring, can be sharpened and/or rounded in order to produce preferably continuous surfaces.
  • a topography already present and/or applied on the initial surface in particular waviness and/or roughness and/or structuring and/or steps already present in the initial surface, is inspected and/or characterized and/or cleaned and/or modified.
  • a top layer and/or top layer stacks and/or partial top layer stacks are inspected and/or characterized and/or cleaned and/or changed and/or applied to the initial surface.
  • Cover layers can be applied to a surface of the base body that has been partially machined, for example, before and in particular after the machining process.
  • a cover layer can be applied to the original surface before processing as part of the modification process, for example to protect functional structures from the damaging effects of the processing process.
  • an effect of an inspected and/or characterized initial surface is evaluated using reference images and/or simulations, with the qualification, in particular a classification, of the initial surface being carried out and/or depending on the evaluated effect measures acting on the initial surface are derived, the measures including a removal of foreign bodies and/or a modification of the initial surface and/or a transfer of information to a subsequent process step, the subsequent process step based on the transferred function derives its own measures, with the subsequent process step taking place in and/or outside the continuous vacuum environment.
  • an optical and/or mechanical and/or chemical and/or geometric property of the initial surface is influenced by means of the modification method, in particular a structuring of individual monolayers and/or an, in particular reactive, mixing of several Monolayers is carried out in a multilayer stack.
  • Frequently occurring defects in the initial surface can be due to shifts in different atomic layers of the material forming the initial surface.
  • a largely defect-free starting surface is advantageously created by the modification process. This can be done in particular by rearranging individual monolayers in a multilayer stack.
  • the initial surface is filled and/or applied and/or removed and/or redistributed and/or smoothed and/or passivated and/or oxidized and/or terminated before the qualification is determined and /or cracks and/or fissures and/or indentations and/or holes in the original surface are healed.
  • additive methods can be used for filling.
  • a termination of the surface of the base body can be provided after processing.
  • the initial surface is filled and/or applied and/or removed and/or redistributed and/or smoothed and/or passivated and/or oxidized and/or or is terminated and/or cracks and/or crevices and/or depressions and/or holes of the original surface are healed. It is particularly advantageous if the aforementioned modification processes are carried out under the continuous vacuum environment, whereby no foreign bodies occurring after the modification process are introduced onto the starting surface and/or chemical changes by particles of gases are minimized.
  • the chemical and/or electrical and/or molecular properties of the initial surface are completely and/or partially inspected and/or characterized and/or changed.
  • the measures relating to the various properties can be carried out in full or in part.
  • the starting surface is inspected completely with regard to its electrical properties and partially with regard to its chemical properties.
  • the starting surface is inspected and/or characterized and/or changed with regard to its chemical properties, preferably nitrated and/or fluorinated and/or doped and/or mixed and/or hydrogenated in a targeted manner, and/or the chemical bonding conditions, in particular between single bonds and double bonds, are inspected and/or characterized and/or changed, and/or the initial surface is modified by means of atomic layer deposition and/or atomic layer etching and/or atomic layer processing
  • the starting surface is formed by an outermost layer of the base body, which has a layer thickness of 0.05 nm to 100 ⁇ m, preferably 0.1 nm to 10 ⁇ m, preferably a layer thickness of 8 nm to 1 pm.
  • the initial surface is formed within the aforementioned layer thicknesses.
  • the initial surface can also include underlying material layers, insofar as these are important for the surface physics of the base body.
  • the starting surface is formed by an outermost layer of the base body, which comprises a plurality of, preferably between 2 and 10, atomic monolayers of the base body.
  • An indication of the layer thickness of the starting surface in numbers of atomic monolayers can be advantageous since the properties of the atomic monolayers forming the starting surface determine the surface physics of the starting surface.
  • the initial surface and/or an initial surface at least partially machined by means of the machining method is inspected and/or characterized and/or cleaned and/or modified during and/or after the end of the machining method.
  • the machined initial surface can be changed in such a way that the errors are corrected.
  • the inspection and/or the characterization and/or the cleaning and/or the modification method are carried out at least partially cyclically with the processing method.
  • the inspection and/or the characterization and/or the cleaning and/or the modification process is carried out at least partially cyclically with the processing method, it can be provided that the inspection and/or the characterization and/or the cleaning and/or the modification process a qualification of the starting surface for a first machining process is determined.
  • the original surface is then processed.
  • the now machined surface of the base body in turn represents a new starting surface, for which a qualification of the starting surface for a second machining process can be determined by the inspection and/or the characterization and/or the cleaning and/or the modification process. This cycle can be repeated until a desired final state of the surface of the base body is reached.
  • the first, second, etc. processing methods can be the same or at least partially different processing methods.
  • the processing method is a surface coating method by which the initial surface of the base body is coated.
  • a processing method for coating a surface is advantageous, in particular for optical elements, in order to increase a reflectivity, for example. Furthermore, reflective coatings in particular, especially reflective layer systems, benefit from a particularly defect-free and undisturbed starting surface.
  • the initial surface and/or a current surface of the base body is additionally inspected and/or characterized and/or cleaned and/or changed by means of the modification method during the processing method.
  • inspection cycles and/or characterization cycles and/or cleaning cycles and/or modification cycles can also be carried out on the surface of the base body during the machining process.
  • a current state of the surface of the base body i. H. an instantaneous surface can be characterized.
  • the current surface can be cleaned or modified, for example, in order to guarantee that the further coating is formed correctly.
  • the inspection and/or the characterization and/or the cleaning and/or the modification method and the processing method are carried out in the same facility.
  • the device has a continuous working chamber in which the continuous vacuum environment is formed.
  • interruptions and/or fluctuations and/or fluctuations in the vacuum environment caused, for example, by a transfer of the base body from one device to another can be reliably avoided.
  • the environmental conditions can also include other influencing factors of the environment on the starting surface, for example a temperature and/or exposure to light, to which the starting surface can be exposed.
  • these other influencing factors are also kept as constant as possible within a range that is not harmful to the initial surface.
  • the inspection and/or the characterization and/or the cleaning and/or the modification process is carried out in a first working chamber and the processing method is carried out in a second working chamber, with the working chambers being connected to one another in this way are connected that there are continuous vacuum conditions in the working chambers and the base body is transferred from the first working chamber to the second working chamber under continuous vacuum conditions directly or using a transport box in which continuous vacuum conditions prevail.
  • more than two working chambers can also be provided, for example a separate working chamber for each method step or a first working chamber for inspection and/or characterization and cleaning, a second working chamber for the processing method and a further working chamber for the modification method.
  • first working chamber and “second working chamber” does not represent a limitation.
  • the method for determining the qualification is carried out in a first spatial structure and there in particular in a first working chamber and the base body is brought into a second working chamber in a second spatial structure, with continuous ambient conditions prevailing in both working chambers.
  • a spatial separation between the individual method steps can be achieved, which leads to an advantageous possibility of a division of labor.
  • a spatial separation between the individual process steps can lead to the possibility of inspecting and/or characterizing and/or cleaning and/or changing a first base body, while a second base body whose qualification for the subsequent processing method has already been determined , is edited.
  • a vacuum device for generating a continuous vacuum environment in order to To keep the initial surface under a continuous vacuum environment from a point in time at the latest immediately after the determination of the qualification of the initial surface at least until completion of the processing.
  • the vacuum device can advantageously be designed as a vacuum pump, since the use of a vacuum pump represents a reliable and established method of generating a vacuum environment.
  • the invention also relates to a device for producing an optical element.
  • the device according to the invention for producing an optical element for a lithography system wherein the optical element is formed from a base body with an initial surface and wherein the device is formed spatially and functionally separately from the lithography system in which the optical element is used, has a processing device for processing the initial surface and a data acquisition device for inspecting and/or characterizing a surface condition of the initial surface, in particular the presence of foreign bodies on the initial surface, and/or a cleaning device for cleaning the initial surface.
  • a determination of a qualification of the initial surface for processing by means of the processing device is based on the inspection and/or the characterization and/or the cleaning.
  • a vacuum device is provided for creating a continuous vacuum environment in order to keep the initial surface under a continuous vacuum environment from a point in time at the latest immediately after the determination of the qualification of the initial surface at least until the start of processing by the processing device.
  • the device according to the invention offers the advantage that entry of foreign bodies between the determination of qualification and the start of processing is prevented. In this way, a suitable qualification for the processing method can be ensured. In this way, optical elements can be created which have a particularly precise and undisturbed surface.
  • the device is set up to keep the initial surface under a continuous vacuum environment from a point in time at the latest immediately after the determination of the qualification of the initial surface at least until the processing by the processing device is completed.
  • the data acquisition device and/or the cleaning device and the processing device located at least partially within the continuous vacuum environment created by the vacuum means.
  • An arrangement of the data acquisition device and/or the cleaning device as well as the processing device in the vacuum environment has an advantageous effect in that, for example, the parts of the devices acting on the initial surface of the base body are arranged in the vacuum environment and are thus shielded from the entry of foreign bodies.
  • the vacuum environment is a high-vacuum environment.
  • a high-vacuum environment has the advantage over a vacuum environment that the ingress of foreign bodies is reduced by an even greater reduction in buoyancy forces.
  • the vacuum environment is formed in a spatially connected, vacuum-tight working chamber, in which the data acquisition device and/or the cleaning device and the processing device are accommodated.
  • the data acquisition device and/or the cleaning device and the processing device can be arranged in a simple manner in such a way that the base body and/or the starting surface are located in a continuous vacuum environment.
  • the vacuum environment is formed in several vacuum-tight working chambers that can at least partially be docked onto and/or undocked from one another, or in several working chambers and a transport box in order to transport the base body between the working chambers, with the data acquisition device and/or the cleaning device is accommodated in at least one working chamber and the processing device is accommodated in at least one working chamber.
  • the vacuum environment can also be formed in a system of several working chambers, provided these can be at least partially docked with one another and/or can be undocked from one another and are vacuum-tight.
  • a transport box for example, is also to be considered as a moving part of the working chamber or as an element to connect the working chambers to one another while maintaining a continuous vacuum environment.
  • different work steps can be carried out at different locations. It is also advantageous if the various working chambers of the system of working chambers are subjected to a continuous vacuum environment by one and the same vacuum device.
  • a vacuum pump can be connected to the individual working chambers of the system of working chambers via vacuum-tight lines, thereby creating a continuous vacuum environment in all working chambers and possibly also in a transport box.
  • the lines from the individual working chambers to the vacuum pump thus also connect the working chambers, so that identical vacuum environments prevail in the working chambers.
  • the transport box can be docked to the working chambers by means of suitable lock devices.
  • the data acquisition device is a device for optical and/or mechanical and/or electrical and/or acoustic inspection and/or characterization of the geometric contour of the initial surface, in particular a static light scattering (SLS) device and/or an interferometer and/or a light microscope and/or an atomic force microscope and/or a scanning tunneling microscope and/or a scanning electron microscope and/or a scanning transmission electron microscope and/or a transmission electron microscope and/or a measuring device for surface acoustic waves.
  • SLS static light scattering
  • the data acquisition devices mentioned are known from the prior art.
  • the data acquisition devices mentioned are advantageously suitable for use under high-vacuum conditions. They therefore offer a reliable possibility of precisely inspecting and/or characterizing the starting surface within the scope of the invention.
  • Optical and/or acoustic devices have the additional advantage that they can also be arranged outside of the vacuum environment.
  • a light source can be arranged outside the working chamber.
  • the light can enter the working chamber through a vacuum-tight window that is transparent to the light of the wavelength used, and the scattered light can exit the working chamber again through the window.
  • the data acquisition device is designed to analyze the material composition of the initial surface, in particular a fluorescence measuring device and/or an X-ray photoelectron spectroscopy device and/or a spectroscope, in particular a Fourier transformation infrared spectroscope and /or an Auger electron spectroscope, and/or an X-ray device.
  • a fluorescence measuring device is an optical device that can advantageously also be arranged outside the working chamber.
  • the cleaning device acts as a device for removing foreign bodies from the initial surface, in particular as a suction device and/or as a compressed air device and/or as a removal device, in particular as a device for adhesive removal and/or as a radiation trap.
  • a desorption device in particular as a laser desorption device and/or as a microwave desorption device and/or resonance-adapted radiation desorption device
  • an etching device in particular as an ion etching device and/or as an ion beam processing device and/or as a reactive gas etching device and/or as Application device is designed for chemical additives or has at least one, in particular several, of the devices.
  • An optical trap is an optical device that can advantageously also be arranged outside the working chamber.
  • a changing device is provided in order to change a surface quality of the base body before processing by means of the processing device.
  • the changing device is a device which is based on radiation, for example, then it can advantageously also be arranged outside the working chamber.
  • the changing device is set up to apply a starting material forming the starting surface to the starting surface and/or to remove and/or redistribute a starting material forming the starting surface from the starting surface and/or to smooth the starting surface and /or to passivate the initial surface and/or to oxidize the initial surface and/or to terminate the initial surface and/or to heal cracks and/or crevices and/or depressions and/or holes in the initial surface.
  • the device can advantageously be set up to enable the initial surface to be inspected and/or characterized and/or modified with regard to its chemical properties, preferably nitrated and/or fluorinated and/or doped and/or specifically mixed and/or hydrogenated, and/or the chemical bonding conditions, in particular between single bonds and double bonds, are inspected and/or characterized and/or changed, and/or the initial surface is modified by means of atomic layer deposition and/or atomic layer etching and/or atomic layer processing.
  • the changing device can have an atomic layer deposition device and/or an atomic layer etching device and/or an atomic layer processing device.
  • the changing device is designed as a heating device for smoothing the initial surface.
  • a mobility of the atoms and/or molecules forming the initial surface can be increased by a heating device.
  • any defects present in the surface such as elevations or depressions, can be compensated for by an increased mobility of the atoms and/or molecules forming the surface.
  • atoms that form an elevation can be moved by increased mobility to distribute themselves evenly on the initial surface and, for example, to fill indentations or gaps.
  • the changing device is at least partially arranged in the vacuum environment.
  • the changing device By arranging the changing device in the vacuum environment, the changing device can have a direct effect on the initial surface and the effect does not have to take place through walls of a vacuum-tight working chamber, for example.
  • Shielding the data acquisition device and/or the cleaning device and/or the changing device can advantageously prevent the subsequent processing method, in particular a surface coating process, which is carried out, for example, in the form of a sputtering process, from causing an undesirable coating and thus reducing the functionality of the data acquisition device and/or the cleaning device and/or the changing device.
  • a shielding device provided for shielding can be implemented, for example, by a plate which prevents particles of a coating material from getting onto the devices.
  • a computing device is provided in order to determine the qualification of the starting surface for processing by the processing device from the surface condition.
  • the computing device is advantageous for calculating a qualification of the starting surface from information about the surface condition of the starting surface, which is obtained for example by the data acquisition device and/or the cleaning device, on the basis of clear, in particular mathematically formulated, criteria.
  • the computing device determines a roughness of the initial surface from data of a light scattering and determines the qualification of the initial surface for processing when the roughness falls below a certain threshold value.
  • the processing device is set up for applying a coating to the initial surface.
  • Optical properties and, for example, a longevity of optical elements can be advantageously improved by suitable coatings.
  • the data acquisition device and/or the cleaning device and/or the changing device and/or the processing device are designed as a combined device.
  • the various components of the device according to the invention are formed in a combination device.
  • the devices are arranged in a common working chamber in such a way that movement of the base body between the individual devices is minimized. It is particularly advantageous if the base body does not have to be moved in order to reach the areas of influence of the various devices, that is to say it is located in the areas of influence at the same time.
  • the base body is rotated in order to reach the effective areas of the various devices.
  • the invention also relates to an optical element, in particular a mirror.
  • the optical element in particular a mirror, is produced at least partially using the method according to the invention and/or at least partially using the device according to the invention.
  • the invention also relates to a lithography system, in particular a projection exposure system.
  • Projection exposure systems have a large number of optical elements.
  • an optical element produced at least partially with a method according to the invention and/or the device according to the invention can advantageously be used.
  • the lithography system according to the invention in particular a projection exposure system for microlithography, comprises an illumination system which has a radiation source, illumination optics and projection optics, the illumination optics and/or the projection optics having at least one optical element.
  • the at least one optical element is produced at least partially with the method according to the invention and/or at least partially using a device according to the invention and/or an optical element according to the invention.
  • the projection exposure system according to the invention has at least one optical element according to the invention, in particular in the form of at least one mirror according to the invention.
  • the method for producing an optical element for a lithography system is carried out outside the lithography system, in particular outside of a projection exposure system, very particularly outside of an EUV projection exposure system.
  • carrying out the method outside the lithography system can be understood in particular to mean that the method is carried out in particular outside a vacuum environment corresponding to the lithography system, in particular outside a vacuum chamber of the lithography system and thus outside the system limits of the lithography system.
  • the method for producing an optical element is carried out as a method for producing optics for EUV projection exposure systems.
  • the initial surface of the base body is inspected and/or cleaned in situ and/or ex situ.
  • An in situ inspection and/or an in situ cleaning of the initial surface can be understood as meaning in particular an inspection and/or cleaning of the initial surface within a location and/or a vacuum chamber of the processing device according to the invention.
  • an inspection and / or cleaning of the initial surface within the spatial and / or functional limits in which the processing method according to the invention, in particular Coating process, takes place, especially within a sphere of action of the machining process.
  • An ex situ inspection and/or an ex situ cleaning of the starting surface can be understood as meaning in particular an inspection and/or cleaning of the starting surface outside of a location and/or a vacuum chamber of the processing device according to the invention.
  • an ex situ inspection and/or an ex situ cleaning of the initial surface can include an inspection and/or cleaning of the initial surface outside the spatial and/or functional limits in which the processing method according to the invention, in particular a coating method, takes place. especially outside a sphere of action of the machining process.
  • the vacuum chamber of the machining process and the flanged-on vacuum chamber are not closed off from one another and thus share a continuous vacuum environment.
  • the processing method comprises at least one changing method.
  • the at least one modifying method can in particular include a modification of the initial surface, such as an application of material, in particular a coating and/or a removal of material, in particular etching.
  • the at least one modifying method can include an exposure, in particular an exposure of a photoresist and/or a doping of the starting surface and/or the optical element, in particular an implantation.
  • the photoresist and/or the exposure are only to be understood as examples of material that is modified or structured by irradiation with electromagnetic waves, such as light, or particles, such as electrons and/or ions, or by the action of heat or temperature can be. It can be provided that the method according to the invention for producing an optical element is a method for ab initio production of the optical element.
  • the full-area coating can be homogeneous and/or inhomogeneous.
  • the processing method of the method according to the invention comprises a coating method in which a larger area, in particular a larger area than the initial surface, is coated inhomogeneously and/or in a spatially resolved manner.
  • a large area is formed from many small areas, which are machined together and/or synchronously. Before processing, the surface or the starting area of each individual part (small area) can be checked and cleaned if necessary.
  • the processing method is carried out in the form of a conditioning method. Provision can be made for the processing method in the form of a coating method and the cleaning and/or the inspection to be carried out alternately in the method according to the invention.
  • the method according to the invention comprises an inspection and/or cleaning and then a processing method, in particular in the form of a coating method, and after the first processing another inspection and/or cleaning and then another processing method, in particular in the form of a coating method is carried out, with another inspection and/or cleaning, if necessary after the second treatment, and then another treatment method, in particular in the form of a coating method, being carried out.
  • the sequence of the inspection and/or the cleaning and the processing method can be carried out repeatedly, in particular as often as necessary.
  • a first layer is applied and then the first layer is cleaned and/or inspected and then a second layer is applied, after which the second layer is cleaned and inspected, etc
  • This process can be repeated with a plurality of layers.
  • the multilayer coating applied in this way can be a molybdenum-silicon layer system.
  • the transport box can be provided to maintain the vacuum during transport.
  • the processing device is set up to modify the initial surface.
  • the modification of the initial surface can include, for example, an application of material, in particular a coating, and/or a removal of material, in particular etching.
  • the processing device for Carrying out a physical vapor deposition in particular for carrying out thermal evaporation, electron beam evaporation, magnetron sputtering and/or molecular beam epitaxy.
  • the processing device is set up to carry out atomic layer deposition.
  • the device is designed as a processing machine for the production of components of lithography systems, the production of the components preferably proceeding from initio.
  • the device is set up to produce optics for EUV projection exposure systems.
  • the device is not a lithography system and is also not part of a lithography system.
  • the device is spatially and functionally separate from a lithography system in which the optical element to be produced is later used.
  • PVD physical vapor deposition
  • a starting material is converted into a gas phase using physical processes.
  • the gaseous material is then fed to a substrate to be coated, where it condenses and forms the target layer.
  • thermal evaporation is to be understood in particular as a vacuum-based coating technique in which an entire starting material is heated to temperatures close to a boiling point by an electrical heater, which can be resistive and/or inductive, after which a material vapor moved to a substrate and condensed there to form a layer.
  • electron beam evaporation is to be understood in particular as a method in which evaporation energy is introduced into a crucible by means of an electron gun is brought to a vaporizer. Thin layers can be vapour-deposited onto a target surface by condensing the gaseous material.
  • magnetron sputtering is to be understood in particular as a sputtering method in which an additional magnetic field is arranged behind a cathode plate of a sputtering system known from the prior art.
  • an electric field and the magnetic field By superimposing an electric field and the magnetic field, charge carriers no longer move parallel to electric field lines, but are deflected onto a spiral path, causing them to circle over a target surface.
  • molecular beam epitaxy is to be understood in particular as a method for producing crystalline thin layers or layer systems, in which substances from which the layer to be produced in the coating method should consist are heated in evaporation crucibles and guided to the substrate as a directed molecular beam. In this case, the substrate is also heated, which allows the layer to grow in an orderly manner.
  • atomic layer deposition is to be understood in particular as a method for depositing extremely thin layers, down to atomic monolayers, on a starting material, in particular the starting surface.
  • This is a highly modified chemical vapor deposition process with two or more cyclically performed self-limiting surface reactions.
  • the material to be deposited is bound in chemical form to one or more carrier gases, with the carrier gases being fed alternately into a reaction chamber and reacted there with the substrate, whereupon the substance bound in the gas is deposited on the substrate material.
  • a conditioning method is to be understood in particular as a method in which a condition of the surface is changed, in particular by chemical oxidation and/or by chemical reduction.
  • ion beam etching is to be understood in particular as a removal process in which ions, in particular argon ions, are accelerated in a vacuum in the direction of a substrate to be processed, so that when the high-energy ions hit the substrate, momentum is transmitted , whereby its surface is atomized and removed.
  • the ion beam etching can be carried out as ion beam figuring.
  • the device according to the invention can be set up in particular to carry out the method steps described above.
  • the values and parameters described here are deviations or fluctuations of ⁇ 10% or less, preferably ⁇ 5% or less, more preferably ⁇ 1% or less, and very particularly preferably ⁇ 0.1% or less of the respectively named Include value or parameter, provided that these deviations are not excluded in the implementation of the invention in practice.
  • the specification of ranges by means of initial and final values also includes all those values and fractions that are enclosed by the range specified in each case, in particular the initial and final values and a respective mean value.
  • FIG. 1 shows an EUV projection exposure system in meridional section
  • FIG. 2 shows a DUV projection exposure system
  • FIG. 3 shows a schematic representation of an exemplary embodiment of the device according to the invention
  • FIG. 4 shows a further schematic illustration of an exemplary embodiment of the device according to the invention.
  • FIG. 5 shows a block diagram representation of an exemplary embodiment of the method according to the invention
  • FIG. 6 shows a block diagram representation of a further exemplary embodiment of the method according to the invention.
  • FIG. 7 shows a schematic illustration of a section through an initial surface of a base body, on which various structures are illustrated by way of example.
  • FIG. 8 shows a schematic representation of a carrier structure with an optical element accommodated
  • FIG. 9 shows a schematic representation of a carrier structure with two optical elements accommodated
  • FIG. 10 shows a further schematic illustration of a carrier structure with a plurality of optical elements accommodated.
  • FIG. 11 shows a schematic representation of a multilayer coating with a layer defect.
  • an illumination system 101 of the EUV projection exposure system 100 has illumination optics 103 for illuminating an object field 104 in an object plane 105 .
  • a reticle 106 arranged in the object field 104 is exposed Reticle holder 107 held.
  • the reticle holder 107 can be displaced via a reticle displacement drive 108, in particular in a scanning direction.
  • FIG. 1 A Cartesian xyz coordinate system is shown in FIG. 1 for explanation.
  • the x-direction runs perpendicularly into the plane of the drawing.
  • the y-direction is horizontal and the z-direction is vertical.
  • the scanning direction runs along the y-direction.
  • the z-direction runs perpendicular to the object plane 105.
  • the EUV projection exposure system 100 includes projection optics 109.
  • the projection optics 109 is used to image the object field 104 in an image field 110 in an image plane 111.
  • the image plane 111 runs parallel to the object plane 105. Alternatively, there is also an angle different from 0° between the object plane 105 and the image plane 111 possible.
  • a structure on the reticle 106 is imaged on a light-sensitive layer of a wafer 112 arranged in the region of the image field 110 in the image plane 111.
  • the wafer 112 is held by a wafer holder 113.
  • the wafer holder 113 can be displaced via a wafer displacement drive 114, in particular along the y-direction.
  • the displacement of the reticle 106 via the reticle displacement drive 108 on the one hand and the wafer 112 on the other hand via the wafer displacement drive 114 can be synchronized with one another.
  • the radiation source 102 is an EUV radiation source.
  • the radiation source 102 emits in particular EUV radiation 115, which is also referred to below as useful radiation or illumination radiation.
  • the useful radiation 115 has, in particular, a wavelength in the range between 5 nm and 30 nm a DPP ("Gas Discharged Produced Plasma") source. It can also be a synchrotron-based radiation source.
  • the radiation source 102 can be a free-electron laser (FEL).
  • the illumination radiation 115 emanating from the radiation source 102 is bundled by a collector 116 .
  • the collector 116 can be a collector with one or more ellipsoidal and/or hyperboloidal reflection surfaces.
  • the at least one reflection surface of the collector 116 can in grazing incidence ("Grazing Incidence", Gl), i.e. with angles of incidence greater than 45°, or in normal incidence ("Normal Incidence", NI), i.e. with angles of incidence smaller than 45°, with of the illumination radiation 115 are applied.
  • Gl grazing Incidence
  • NI normal incidence
  • the collector 116 can be structured and/or coated on the one hand to optimize its reflectivity for the useful radiation 115 and on the other hand to suppress stray light.
  • the illumination radiation 1 15 propagates through an intermediate focus in a
  • the intermediate focal plane 1 17 can be a separation between a Radiation source module, comprising the radiation source 102 and the collector 116, and the illumination optics 103 represent.
  • the illumination optics 103 includes a deflection mirror 118 and a first facet mirror 119 downstream of this in the beam path.
  • the deflection mirror 118 can be a planar deflection mirror or alternatively a mirror with an effect that influences the bundle beyond the pure deflection effect. Alternatively or additionally, the deflection mirror 118 can be designed as a spectral filter, which separates a useful light wavelength of the illumination radiation 115 from stray light of a different wavelength.
  • the first facet mirror 119 is arranged in a plane of the illumination optics 103 which is optically conjugate to the object plane 105 as a field plane, it is also referred to as a field facet mirror.
  • the first facet mirror 119 includes a multiplicity of individual first facets 120, which are also referred to below as field facets. A few of these facets 120 are shown in FIG. 1 only by way of example.
  • the first facets 120 can be embodied as macroscopic facets, in particular as rectangular facets or as facets with an arcuate or part-circular edge contour.
  • the first facets 120 can be embodied as planar facets or alternatively as convexly or concavely curved facets.
  • the first facets 120 themselves can each also be composed of a multiplicity of individual mirrors, in particular a multiplicity of micromirrors.
  • the first facet mirror 119 can be embodied in particular as a microelectromechanical system (MEMS system). Reference is made to DE 10 2008 009 600 A1 for details.
  • MEMS system microelectromechanical system
  • the illumination radiation 115 runs horizontally between the collector 116 and the deflection mirror 118, ie along the y-direction.
  • a second facet mirror 121 is arranged downstream of the first facet mirror 119 in the beam path of the illumination optics 103. If the second facet mirror 121 is arranged in a pupil plane of the illumination optics 103, it is also referred to as a pupil facet mirror. The second facet mirror 121 can also be arranged at a distance from a pupil plane of the illumination optics 103 . In this case, the combination of the first facet mirror 119 and the second facet mirror 121 is also referred to as a specular reflector. Specular reflectors are known from US 2006/0132747 A1, EP 1 614 008 B1 and US Pat. No. 6,573,978.
  • the second facet mirror 121 includes a plurality of second facets 122.
  • the second facets 122 are also referred to as pupil facets.
  • the second facets 122 can also be macroscopic facets, which can have round, rectangular or hexagonal borders, for example, or alternatively facets composed of micromirrors. In this regard, reference is also made to DE 10 2008 009 600 A1.
  • the second facets 122 can have plane or alternatively convexly or concavely curved reflection surfaces.
  • the illumination optics 103 thus forms a double-faceted system. This basic principle is also called "Fly's Eye Integrator”.
  • the individual first facets 120 are imaged in the object field 104 with the aid of the second facet mirror 121 .
  • the second facet mirror 121 is the last beam-forming mirror or actually the last mirror for the illumination radiation 115 in the beam path in front of the object field 104.
  • transmission optics can be arranged in the beam path between the second facet mirror 121 and the object field 104 , which particularly contribute to the imaging of the first facets 120 in the object field 104 .
  • the transmission optics can have exactly one mirror, but alternatively also have two or more mirrors, which are arranged one behind the other in the beam path of the illumination optics 103 .
  • the transmission optics can in particular comprise one or two mirrors for normal incidence (NI mirror, "normal incidence” mirror) and/or one or two mirrors for grazing incidence (GI mirror, "gracing incidence” mirror).
  • the illumination optics 103 has exactly three mirrors after the collector 116, namely the deflection mirror 118, the field facet mirror 119 and the pupil facet mirror 121.
  • the deflection mirror 118 can also be omitted, so that the illumination optics 103 can then have exactly two mirrors downstream of the collector 116, namely the first facet mirror 119 and the second facet mirror 121.
  • the imaging of the first facets 120 by means of the second facets 122 or with the second facets 122 and transmission optics in the object plane 105 is generally only an approximate imaging.
  • the projection optics 109 includes a plurality of mirrors Mi, which are numbered consecutively according to their arrangement in the beam path of the EUV projection exposure system 100 .
  • the projection optics 109 include six mirrors M1 to M6. Alternatives with four, eight, ten, twelve or another number of mirrors Mi are also possible.
  • the penultimate mirror M5 and the last mirror M6 each have a passage opening for the illumination radiation 115.
  • the projection optics 109 are doubly obscured optics.
  • the projection optics 109 has an image-side numerical aperture which is greater than 0.5 and which can also be greater than 0.6 and which can be 0.7 or 0.75, for example.
  • Reflection surfaces of the mirrors Mi can be designed as free-form surfaces without a rotational axis of symmetry.
  • the reflection surfaces of the mirrors Mi can be designed as aspherical surfaces with exactly one axis of rotational symmetry of the reflection surface shape.
  • the mirrors Mi can have highly reflective coatings for the illumination radiation 115. These coatings can be designed as multilayer coatings, in particular with alternating layers of molybdenum and silicon.
  • the projection optics 109 has a large object-image offset in the y-direction between a y-coordinate of a center of the object field 104 and a y-coordinate of the center of the image field 110.
  • This object-image offset in the y-direction can be approximately as large as a z-distance between the object plane 105 and the image plane 1 11.
  • the projection optics 109 can in particular be anamorphic. In particular, it has different imaging scales ⁇ x, ⁇ y in the x and y directions.
  • a positive image scale ß means an image without image reversal.
  • a negative sign for the imaging scale ß means imaging with image reversal.
  • the projection optics 109 thus leads to a reduction in the ratio 4:1 in the x-direction, ie in the direction perpendicular to the scanning direction.
  • the projection optics 109 lead to a reduction of 8:1 in the y-direction, ie in the scanning direction.
  • Imaging scales are also possible.
  • the number of intermediate image planes in the x-direction and in the y-direction in the beam path between the object field 104 and the image field 110 can be the same or, depending on the design of the projection optics 109, can be different.
  • Examples of projection optics with different numbers of such intermediate images in the x and y direction are known from US 2018/0074303 A1.
  • one of the pupil facets 122 is assigned to precisely one of the field facets 120 in order to form a respective illumination channel for illuminating the object field 104 . In this way, in particular, lighting can result according to Köhler's principle.
  • the far field is broken down into a large number of object fields 104 with the aid of the field facets 120 .
  • the field facets 120 generate a plurality of images of the intermediate focus on the pupil facets 122 respectively assigned to them.
  • the field facets 120 are each imaged onto the reticle 106 by an associated pupil facet 122 in a superimposed manner in order to illuminate the object field 104 .
  • the illumination of the object field 104 is as homogeneous as possible. It preferably has a uniformity error of less than 2%. Field uniformity can be achieved by superimposing different illumination channels.
  • the illumination of the entrance pupil of the projection optics 109 can be geometrically defined by an arrangement of the pupil facets.
  • the intensity distribution in the entrance pupil of the projection optics 109 can be set by selecting the illumination channels, in particular the subset of the pupil facets that guide light. This intensity distribution is also referred to as an illumination setting.
  • a likewise preferred pupil uniformity in the area of defined illuminated sections of an illumination pupil of the illumination optics 103 can be achieved by redistributing the illumination channels.
  • the projection optics 109 can in particular have a homocentric entrance pupil. This can be accessible. It can also be inaccessible.
  • the entrance pupil of the projection optics 109 cannot regularly be illuminated exactly with the pupil facet mirror 121 .
  • the aperture rays often do not intersect at a single point.
  • a surface can be found in which the distance between the aperture rays, which is determined in pairs, is minimal. This surface represents the entrance pupil or a surface conjugate to it in position space. In particular, this surface shows a finite curvature.
  • the projection optics 109 may have different positions of the entrance pupil for the tangential and for the sagittal beam path.
  • an imaging element in particular an optical component of the transmission optics, should be provided between the second facet mirror 121 and the reticle 106 . With the help of this optical component, the different positions of the tangential entrance pupil and the sagittal entrance pupil can be taken into account.
  • the first field facet mirror 119 is arranged tilted to the object plane 105 .
  • the first facet mirror 119 is tilted relative to an arrangement plane that is defined by the deflection mirror 118.
  • the first facet mirror 119 is tilted relative to an arrangement plane that is defined by the second facet mirror 121 .
  • the DUV projection exposure system 200 has an illumination system 201, a device called a reticle stage 202 for receiving and precisely positioning a reticle 203, through which the later structures on a wafer 204 are determined, a wafer holder 205 for holding, moving and precisely positioning the wafer 204 and an imaging device, namely projection optics 206, with a plurality of optical elements, in particular lenses 207, which are held in an objective housing 209 of the projection optics 206 via mounts 208.
  • an illumination system 201 a device called a reticle stage 202 for receiving and precisely positioning a reticle 203, through which the later structures on a wafer 204 are determined
  • a wafer holder 205 for holding, moving and precisely positioning the wafer 204
  • an imaging device namely projection optics 206, with a plurality of optical elements, in particular lenses 207, which are held in an objective housing 209 of the projection optics 206 via mounts 208.
  • various refractive, diffractive and/or reflective optical elements including mirrors, prisms, end plates and the like, can be provided.
  • the basic functional principle of the DUV projection exposure system 200 provides that the structures introduced into the reticle 203 are imaged onto the wafer 204 .
  • the illumination system 201 provides a projection beam 210 in the form of electromagnetic radiation that is required for imaging the reticle 203 onto the wafer 204 .
  • a laser, a plasma source or the like can be used as the source for this radiation.
  • the radiation is shaped in the illumination system 201 via optical elements in such a way that the projection beam 210 has the desired properties in terms of diameter, polarization, shape of the wave front and the like when it strikes the reticle 203 .
  • An image of the reticle 203 is generated by means of the projection beam 210 and transmitted to the wafer 204 in a correspondingly reduced size by the projection optics 206 .
  • the reticle 203 and the wafer 204 can be moved synchronously, so that areas of the reticle 203 are imaged onto corresponding areas of the wafer 204 practically continuously during a so-called scanning process.
  • an air gap between the last lens 207 and the wafer 204 can be replaced by a liquid medium which has a refractive index greater than 1.0.
  • the liquid medium can be, for example, ultrapure water.
  • Such a structure is also referred to as immersion lithography and has an increased photolithographic resolution.
  • the use of the invention is not limited to use in projection exposure systems 100, 200, in particular not with the structure described.
  • the invention and the following exemplary embodiments are not to be understood as being restricted to a specific design.
  • the following figures represent the invention only by way of example and in a highly schematic manner.
  • Figure 3 shows a possible exemplary embodiment of a device 1 for producing an optical element 2 (see Figure 4) for a lithography system, the optical element 2 being formed from a base body 3 with an initial surface 4, with the device 1 being spatially and functionally separate from the Lithography system in which the optical element is used is formed.
  • the device 1 has a processing device 5 for processing the initial surface 4 and a data acquisition device 6 for inspecting and/or characterizing a surface condition of the initial surface 4 , in particular the occurrence of foreign bodies 7 on the initial surface 4 .
  • the device 1 has a cleaning device 8 for cleaning the starting surface 4 .
  • a determination of a qualification of the initial surface 4 for processing by means of the processing device 5 is based on the inspection and/or the characterization and/or the cleaning. Furthermore, a vacuum device 9 is provided for generating a continuous vacuum environment 19 in order to keep the initial surface 4 under a continuous vacuum environment 19 from a point in time at the latest immediately after the determination of the qualification of the initial surface 4 at least until the start of processing.
  • the optical element 2 can be, for example, an optical element, in particular a concave mirror, within the illumination optics 103 and/or the projection optics 109, 206 of one of the projection exposure systems 100, 200 described above (or another projection exposure system).
  • the optical element can be designed, for example, as a mirror 116, 118, 119, 120, 121, 122, Mi or as a lens 207 or as another functional element in the beam path.
  • the functional elements can be, for example, masks and/or wafer inspection systems and/or optical circuits and/or holograms, in particular computer-generated holograms and/or micro-optics and/or optical memories and/or optoelectronic elements and/or photolithographic pellicles and/or or act acousto-optical elements and / or magneto-optical elements and / or electro-optical elements.
  • the method according to the invention and the device according to the invention are particularly suitable for use in the production of mirrors for grazing incidence (GI mirrors, "Gracing Incidence” mirrors), in particular for mirrors for grazing incidence which are used in projection exposure systems.
  • GI mirrors "Gracing Incidence” mirrors
  • the exemplary embodiment of the device 1 illustrated in FIG. 3 is also set up to activate the starting surface 4 from a point in time at the latest immediately after the determination of the qualification of the To keep the starting surface 4 under a continuous vacuum environment 19 at least until the processing by the processing device 5 has been completed.
  • the data acquisition device 6 is particularly suitable for inspecting and/or characterizing the initial surface 4.
  • the vacuum environment 19 is a high-vacuum environment.
  • the vacuum environment 19 is formed in a spatially connected, vacuum-tight working chamber 10, in which the data acquisition device 6 and the cleaning device 8 as well as the processing device 5 are accommodated.
  • an SLS device and/or an interferometer and/or a light microscope and/or an atomic force microscope (AFM) and/or a scanning tunneling microscope and/or a scanning electron microscope and/or a scanning transmission electron microscope and/or a transmission electron microscope and/or a measuring device for acoustic is surface waves.
  • the data acquisition device 6 is a fluorescence measuring device and/or an X-ray photoelectron spectroscopy device and/or a spectroscope, in particular a Fourier transform infrared spectroscope and/or an Auger electron spectroscope and/or an X-ray device.
  • the cleaning device 8 is designed as a device for removing foreign bodies 7 from the starting surface 4 .
  • the cleaning device 8 functions as a suction device and/or as a compressed air device and/or as a removal device, in particular as a device for adhesive removal and/or as a radiation trap, in particular as an optical trap, in particular as optical tweezers and/or or as a desorption device, in particular as a laser desorption device and/or as a microwave desorption device and/or as a resonance-adapted radiation desorption device and/or as an etching device, in particular as an ion etching device and/or as a Ion beam processing device and/or as a reactive gas etching device and/or as an application device for chemical additives.
  • the cleaning device 8 can have at least one, in particular also several of the aforementioned devices.
  • the changing device 11 is set up to apply a starting material forming the starting surface 4 to the starting surface 4 and/or to remove and/or redistribute a starting material forming the starting surface 4 from the starting surface 4 and/or to smooth the starting surface 4 and/or to smooth the starting surface 4 to passivate and/or to oxidize the starting surface 4 and/or to terminate the starting surface 4 and/or to heal cracks and/or crevices and/or depressions and/or holes of the starting surface 4.
  • the changing device 11 is preferably designed as a heating device for smoothing the initial surface 4 .
  • a heating effect is achieved in that the changing device 11 emits infrared radiation, which heats the exit surface 4 of the base body 3 .
  • the changing device 11 is preferably arranged in the vacuum environment 19, as illustrated.
  • a computing device 12 is also provided in order to determine the qualification of the starting surface 4 for processing by the processing device 5 from the surface condition.
  • the processing device 5 is set up to apply a coating 13 to the initial surface 4 .
  • the data acquisition device 6 and the cleaning device 8 and the changing device 11 and the processing device 5 are designed as a combined device in such a way that the base body 4 is simultaneously in an area of influence of the named devices 5, 6, 8, 11.
  • FIG. 4 shows an exemplary embodiment of a device 1, wherein the vacuum environment 19 is formed in a plurality of vacuum-tight working chambers 10 that can at least partially be docked onto one another and/or can be undocked from one another, and a transport box 14.
  • the transport box 14 is set up to transport the base body 3 between the working chambers 10 .
  • the data acquisition device 6 and the cleaning device 8 and the changing device 11 are accommodated in a working chamber 10 .
  • the processing device 5 is accommodated in the other working chamber 10 .
  • FIG. 4 further working chambers 10 can also be provided, in particular in order to accommodate the devices 5, 6, 8 and 10 individually or in groups. If the working chambers 10 are designed to be able to be at least partially docked to and/or undocked from one another, a transport box 14 can also be dispensed with. If a transport box 14 is used, it can also suffice if it can be connected to the working chambers 10 in each case. This means that docking and/or undocking of the working chambers 10 can be dispensed with.
  • Figure 5 shows a block diagram representation of an embodiment of the method according to the invention for producing an optical element 2 for a lithography system, the method being carried out outside of the lithography system in which the optical element is used, after which the starting surface 4 of the base body 3, in particular an occurrence of foreign objects 7 on the initial surface 4 before the processing method, represented by a processing block 15, inspected and/or characterized, represented by a data acquisition block 16 and/or cleaned, represented by a cleaning block 17, and from this a qualification of the initial surface 4 for the following processing method, represented by the processing block 15, is determined, represented by a determination block 18.
  • the starting surface 4 is kept under a continuous vacuum environment, shown in Figure 5 by a vacuum block 19, from a point in time at the latest immediately after the determination of the qualification (determination block 18) of the starting surface 4, at least until the start of the processing method (processing block 15).
  • the vacuum environment 19 is a high-vacuum environment.
  • FIG. 6 shows an exemplary embodiment of a method according to which the starting surface 4 is kept under the continuous vacuum environment 19 from a point in time at the latest while it is being inspected and/or characterized and/or cleaned and at least until a conclusion of the processing method.
  • the data acquisition block 16 and the cleaning block 17 and the detection block 18 and the processing block 15 are located within the vacuum block 19, i.e. within the vacuum environment.
  • the starting surface 4 is kept under a continuous vacuum environment 19 at least until the machining process 15 has been completed.
  • a geometric contour of the initial surface 4, in particular an occurrence of foreign bodies 7, is measured using an optical and/or mechanical and/or electrical and/or acoustic measuring method inspected and/or characterized.
  • static light scattering and/or interferometry and/or light microscopy and/or atomic force microscopy and/or scanning tunneling microscopy and/or scanning electron microscopy and/or scanning transmission electron microscopy and/or transmission electron microscopy and/or a measuring method for the method can be used be surface acoustic waves.
  • the inspection and/or characterization represented by the data acquisition block 16 is designed in such a way that a material composition of the initial surface 4, in particular the presence of foreign bodies 7, is analyzed by means of a measuring method.
  • the measuring method can be a fluorescence measurement and/or an X-ray photoelectron spectroscopy and/or a spectroscopy, in particular a Fourier transformation infrared spectroscopy and/or an Auger electron spectroscopy and/or an X-ray measurement.
  • the cleaning block 17 includes a cleaning, after which the starting surface 4 is cleaned by the foreign bodies 7 being sucked off and/or blown off and/or adhesively removed and/or evaporated and/or crushed and/or etched away and/or, in particular optically, from the starting surface 4 , to be captured.
  • the initial surface 4 is changed by means of a change method, represented by a change block 20, before the qualification is determined.
  • an effect of an inspected and/or characterized initial surface 4 is evaluated using reference images and/or simulations, with the qualification, in particular a classification, of the initial surface 4 being determined depending on the evaluated effect takes place and/or measures acting on the initial surface 4 are derived, the measures including a removal of foreign bodies 7 and/or a modification of the initial surface 4 and/or a transfer of information to a subsequent process step, the subsequent process step being based on the transferred Function derives its own measures, with the subsequent process step taking place in and/or outside of the continuous vacuum environment 19 .
  • An optical and/or mechanical and/or chemical and/or geometric property of the initial surface 4 is influenced by means of the modification method illustrated in the modification block 20; in particular, individual monolayers are structured and/or, in particular reactively, several monolayers are mixed in a multilayer stack .
  • the modification method shown in the modification block 20 allows the initial surface 4 to be filled and/or applied and/or removed and/or redistributed and/or smoothed and/or passivated and/or oxidized and/or terminated before the qualification is determined. Furthermore, cracks and/or crevices and/or depressions and/or holes in the surface 4 can be healed.
  • the chemical and/or electrical and/or molecular properties of the initial surface 4 can be completely and/or partially inspected and/or characterized and/or changed by the methods illustrated in the exemplary embodiments in FIGS.
  • the methods illustrated in the exemplary embodiments in FIGS. 5 and 6 can also cause the starting surface 4 to be inspected and/or characterized and/or modified with regard to its chemical properties, preferably nitrated and/or fluorinated and/or doped and/or specifically is mixed and/or hydrogenated, and/or the chemical bonding conditions, in particular between single bonds and double bonds, are inspected and/or characterized and/or changed, and/or the starting surface 4 is exposed by means of atomic layer deposition and/or atomic layer etching and/or atomic layer processing is modified
  • the machining method represented by the machining block 15 is a surface coating method, by means of which the starting surface 4 of the base body 3 is coated.
  • Those method steps which are located within the vacuum block 19 in the exemplary embodiment shown in FIG. 6 can be carried out multiple times in succession in the order shown. In particular, the method shown in FIG. 6 can be carried out several times in succession. This means that during the machining process the initial surface 4 and/or a current surface of the base body can also be inspected and/or characterized and/or cleaned and/or changed by means of the modification process.
  • the vacuum block 19 shown in FIG. 6 also enables continuous vacuum conditions to be provided from the beginning of the inspection and/or characterization 16 and/or the cleaning 17 and/or the modification process 20 to the completion of the machining process 15.
  • the exemplary embodiment of the method illustrated in FIG. 6 also provides that the starting surface (4) and/or a surface is at least partially machined by means of the machining method Output surface (4) is inspected and/or characterized and/or cleaned and/or modified during and/or after the completion of the machining process.
  • the exemplary embodiment of the method illustrated in FIG. 6 also provides that the inspection and/or the characterization and/or the cleaning and/or the modification method 20 are carried out at least partially cyclically with the processing method 15.
  • the method shown in FIG. 6 can, for example, advantageously be carried out in the device 1 shown in FIG.
  • the inspection and/or characterization 16 and/or the cleaning 17 and/or the modification method 20 and the processing method 15 can be carried out in the same device, in particular the device 1 .
  • the inspection and/or characterization 16 and/or the cleaning 17 and/or the modification process 20 can be carried out in a first working chamber 10 and the processing method 15 can be carried out in a second working chamber 10 .
  • the working chambers 10 should be connected to one another in such a way that continuous vacuum conditions prevail in the working chambers 10 and the base body 4 is transferred from the first working chamber 10 to the second working chamber 10 under continuous vacuum conditions directly or using a transport box 14 in which continuous vacuum conditions prevail becomes.
  • all process steps take place within a continuous vacuum environment, represented by the vacuum block 19 .
  • the transition from the locations of the respective method steps is represented by the arrows between the blocks. Also these arrows, i. H. the transitions of the base body 3 between the locations of the individual process steps are located within the continuous vacuum environment and thus within the vacuum block 19.
  • FIG. 7 shows a schematic representation of a section through an initial surface 4 of a base body 3 on which different structures are represented by way of example.
  • the structures shown below can be formed individually or in any combination on an initial surface 4 of a base body.
  • the output surface 4 here has, for example, a lateral structure 21 and a conductor track 22 as part of a topography 23 .
  • the topography 23 comprises steps 25 having side faces 24.
  • the steps 25 also have edges 26 in the example shown in FIG.
  • the initial surface 4 has a waviness 27 , a roughness 28 and a partial cover layer package 10 .
  • the lateral structuring 21, preferably Conductor tracks 22 and/or grids and/or the topography 23 is formed and/or inspected and/or characterized and/or cleaned and/or modified.
  • the topography 23 present and/or applied on the starting surface 4 is changed by cleaning the side surfaces 24 of the steps 25 and/or the edges 26 may be sharpened and/or rounded to preferably produce smooth surfaces.
  • the topography 23 already present and/or applied on the starting surface 4, in particular the waviness 27 and/or the roughness 28 and/or the structuring and /or the steps 25 already present in the starting surface 4 are inspected and/or characterized and/or cleaned and/or modified.
  • a cover layer and/or cover layer packages and/or the partial cover layer packages 29 are inspected and/or characterized and/or cleaned and/or changed and /or be raised.
  • the starting surface 4 shown in FIG. 7 is formed by an outermost layer of the base body 3, which has a layer thickness of 0.05 nm to 1000 ⁇ m, preferably 0.1 nm to 10 ⁇ m, preferably a layer thickness of 8 nm to 1 ⁇ m.
  • the starting surface 4 shown in FIG. 7 can be formed by an outermost layer of the base body 3, which can comprise a plurality of, preferably between 2 and 10, atomic monolayers of the base body 3.
  • FIG. 8 shows a schematic representation of a carrier structure 30 with a single optical element 2 accommodated, with the output surface 4 of the optical element 2 being shown in a plan view.
  • a preferably full-area coating of the entire support structure 30 and thus also of the initial surface 4 within the support structure 30 can be provided.
  • FIG. 9 shows a schematic representation of the carrier structure 30, two optical elements 2 with respective output surfaces 4 being arranged on the carrier structure 30.
  • FIG. Within the processing block 15 (see FIG. 6) it can be provided that the entire carrier structure 30 is coated, whereby both initial surfaces 4 are coated simultaneously.
  • FIG. 10 shows a further schematic illustration of the support structure 30, with a multiplicity of optical elements 2 being accommodated in the support structure 30.
  • One of the optical output surfaces 4 is covered by a mask 31 , preferably partially, which results in a homogeneous coating of the optical output surfaces 4 with the exception of the area covered by the mask 31 when the carrier structure 30 is coated over the entire surface.
  • the carrier structure 30 shown in FIGS. 8, 9 and 10 can preferably have a diameter 32 of 0.1 m to 3 m, preferably 0.2 m to 2 m, particularly preferably 0.3 m to 1 m, or an area of 0.008 m 2 to 7 m 2 , preferably from 0.03 m 2 to 3 m 2 , in particular from 0.07 m 2 to 0.79 m 2 .
  • FIG. 11 shows a schematic representation of a coating 13 designed as a multi-layer coating, with a layer defect 33 penetrating all layers of the multi-layer coating by way of example.
  • a layer defect 33 can be avoided when the method according to the invention is carried out with a layer-by-layer alternating implementation of the processing method in the form of the coating method and the inspection and/or cleaning.

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Abstract

L'invention concerne un procédé de fabrication d'un élément optique (2) destiné à un système de lithographie, le procédé étant mis en œuvre à l'extérieur du système de lithographie dans lequel l'élément optique (2) est utilisé, procédé au cours duquel la surface d'origine (4) d'un corps principal (3), plus particulièrement la présence des corps étrangers (7) sur ladite surface d'origine (4), est inspectée et/ou caractérisée et/ou nettoyée avant un processus d'usinage (15) et, sur cette base, il est déterminé si la surface d'origine (4) est qualifiée pour passer au processus d'usinage suivant (15). En outre, la surface d'origine (4) est maintenue dans un environnement sous vide continu (19) à partir d'un point dans le temps au plus tard immédiatement après qu'il a été déterminé si la surface d'origine (4) est qualifiée et s'étale au moins jusqu'au début du processus d'usinage (15).
EP22703354.5A 2021-02-03 2022-02-02 Procédé de fabrication d'un élément optique, appareil de fabrication d'un élément optique, élément optique et système de lithographie Pending EP4288839A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021201001.6A DE102021201001A1 (de) 2021-02-03 2021-02-03 Verfahren zur Herstellung eines optischen Elements, Vorrichtung zur Herstellung eines optischen Elements, optisches Element und Lithografiesystem
PCT/EP2022/052437 WO2022167466A1 (fr) 2021-02-03 2022-02-02 Procédé de fabrication d'un élément optique, appareil de fabrication d'un élément optique, élément optique et système de lithographie

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EP4288839A1 true EP4288839A1 (fr) 2023-12-13

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EP (1) EP4288839A1 (fr)
CN (1) CN116848471A (fr)
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Publication number Priority date Publication date Assignee Title
US6573978B1 (en) 1999-01-26 2003-06-03 Mcguire, Jr. James P. EUV condenser with non-imaging optics
DE10101014A1 (de) * 2001-01-05 2002-07-11 Zeiss Carl Beschichtung optischer Elemente, insbesondere für Verwendung mit Ultraviolettlicht
JP2004108876A (ja) * 2002-09-17 2004-04-08 Canon Inc 多層膜ミラーの検査修正装置
DE10258715B4 (de) * 2002-12-10 2006-12-21 Carl Zeiss Smt Ag Verfahren zur Herstellung eines optischen Abbildungssystems
DE10317667A1 (de) 2003-04-17 2004-11-18 Carl Zeiss Smt Ag Optisches Element für ein Beleuchtungssystem
DE102008009600A1 (de) 2008-02-15 2009-08-20 Carl Zeiss Smt Ag Facettenspiegel zum Einsatz in einer Projektionsbelichtungsanlage für die Mikro-Lithographie
DE102015226531A1 (de) 2015-04-14 2016-10-20 Carl Zeiss Smt Gmbh Abbildende Optik zur Abbildung eines Objektfeldes in ein Bildfeld sowie Projektionsbelichtungsanlage mit einer derartigen abbildenden Optik

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