EP1979926A2 - Fokussier- und positionierhilfseinrichtung für ein teilchenoptisches rastermikroskop - Google Patents
Fokussier- und positionierhilfseinrichtung für ein teilchenoptisches rastermikroskopInfo
- Publication number
- EP1979926A2 EP1979926A2 EP07703114A EP07703114A EP1979926A2 EP 1979926 A2 EP1979926 A2 EP 1979926A2 EP 07703114 A EP07703114 A EP 07703114A EP 07703114 A EP07703114 A EP 07703114A EP 1979926 A2 EP1979926 A2 EP 1979926A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- particle
- optical
- axis
- positioning
- focusing
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/20—Means for supporting or positioning the object or the material; Means for adjusting diaphragms or lenses associated with the support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/21—Means for adjusting the focus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/22—Optical, image processing or photographic arrangements associated with the tube
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
- H01J37/28—Electron or ion microscopes; Electron or ion diffraction tubes with scanning beams
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/21—Focus adjustment
- H01J2237/216—Automatic focusing methods
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/248—Components associated with the control of the tube
- H01J2237/2482—Optical means
Definitions
- the present invention relates to a focusing and positioning auxiliary device for a particle-optical scanning microscope, a particle-optical scanning microscope with a corresponding focusing and positioning aid, and a method for focusing and positioning of an object in a particle-optical scanning microscope.
- the positioning of the object takes place relative to the particle-optical or electron-optical beam axis by means of the adjustable in three mutually perpendicular directions object table.
- the adjustable In scanning electron microscopes and other particle-optical scanning devices, the positioning of the object takes place relative to the particle-optical or electron-optical beam axis by means of the adjustable in three mutually perpendicular directions object table.
- To observe the object during positioning is a CCD camera with a, often infrared, chamber illumination. Since the optics of the CCD camera have a very large depth of field, it is hardly possible to position the object in the direction of the optical axis of the CCD camera with an accuracy better than about 5 mm.
- the CCD camera image also serves to position the object in the direction of the particle-optical beam axis, ie to bring the object plane into the plane defined by the working distance of the particle-optical objective.
- this is also possible only with an accuracy of a few millimeters, which is often insufficient for a coarsely focused particle-optical image. Therefore, it is often necessary to search under particle optical irradiation and the existing positioning sensitivity both the desired location on the object as well as the object to the correct working distance.
- JP 63254649 has already been proposed in a
- Scanning electron microscope additionally provide an optical microscope, with the laser beam an auxiliary signal for the generation of an autofocus signal for the electron optics is generated.
- This object is achieved by a focusing and positioning auxiliary device having the features of claim 1.
- This object is achieved by a particle scanning microscope having the features of claim 7.
- Another object of the invention is to provide a method for easier and reliable setting of an object on the working distance of the particle-optical objective and for easier and reliable positioning of an object detail of interest perpendicular to the particle-optical axis of a scanning microscope. This object is achieved by a method having the features of claim 8.
- a focusing and positioning auxiliary device for a particle-optical scanning microscope has an illumination device which generates a collimated or focused light beam at a first angle to the particle-optical beam axis, which intersects the particle-optical beam axis of the scanning microscope at a predefined position.
- the focusing and positioning auxiliary device furthermore has a camera sensitive to the wavelength of the light beam, with which an image of an object positioned on the object table is recorded at a second angle relative to the particle-optical beam axis.
- a display is provided as well as a control device for the generation of an image recorded with the camera on the display together with a marking which indicates the position of the particle-optical beam axis in the image.
- a particle beam system comprises a particle beam generator, an objective lens, a sample chamber and an object table arranged in the sample chamber. Furthermore, a focusing and positioning auxiliary device is provided, which generates a collimated or focused light beam at a first angle to the particle-optical beam axis, which intersects the particle-optical beam axis of the scanning microscope at a predefined position.
- the focusing and positioning auxiliary device furthermore has a camera sensitive to the wavelength of the light beam, with which an image of an object positioned on the object table is recorded at a second angle relative to the particle-optical beam axis.
- a display is provided as well as a control device for the generation of an image recorded with the camera on the display together with a marking which indicates the position of the particle-optical beam axis in the image.
- a method for focusing and positioning an object in a particle scanning microscope comprises the following steps: a) providing a light beam which intersects the particle-optical axis of the objective at a predetermined position, b) providing a camera corresponding to the wavelength of the C) providing a display on which the position of the particle-optical axis of the objective is marked, d) recording an image of an object positioned on the object table with the camera, e) positioning the object table in the direction of the particle-optical axis of the objective until the image of the object shown on the display intersects the object on the marking, and f) switching the particle-optical scanning microscope to irradiation of the object with electrons and displaying an image of the object by detected particles or quanta of light generated by irradiation of the object with charged particles.
- Figure 1 The schematic diagram of a scanning electron microscope with a focus
- FIG. 2 the scanning electron microscope from FIG. 1 in a direction perpendicular to FIG
- FIG. 3 shows a camera image of an object with a superimposed marking
- FIG. 4 shows a block diagram of the method steps taking place in a focusing and positioning method.
- the scanning electron microscope in FIG. 1 has a sample chamber (1) and the electron-optical column (2) received thereon.
- the elements required for the beam shaping of the beam of charged ponds are excluded.
- a particle emitter (3) is provided, for example, in the form of a thermal electron source, an LAB6 emitter or a thermal or cold field emission source.
- electrodes (4, 5) subjected to a corresponding electrostatic potential, the charged particles are extracted from the emitter (3) and accelerated to the desired target energy of the particle beam. If the particles of the particle beam are negatively charged, as in the case of electrons, the electrostatic potentials of the electrodes (4. 5) are positive to the electrostatic potential of the emitter (3).
- both the condenser lens (6) and the objective lens (8) are formed as magnetic lenses, which is why they are shown as magnetic pole pieces with magnetic coils (9, 20) accommodated therein.
- both the condenser lens (6) and the objective lens (8) may also be formed as an electrostatic lens.
- the objective lens (8) may be formed as a combination electrostatic-magnetic lens that generates both a magnetic field and an electrostatic field.
- the beam deflection device is arranged, which is realized in the embodiment shown in Figure 1 by deflection coils (10), which are arranged approximately at the level of Polschuhspalts the objective lens (8).
- the particle beam focused by the objective lens (8) can be deflected perpendicular to the particle-optical beam axis (7) (hereinafter also referred to as optical axis (7) for short) defined by the rotational symmetry of the objective lens (8).
- the beam deflection device can also be designed as a so-called double deflection system with two individual deflection systems successive in the direction of the optical axis (7).
- An arrangement of the deflection coils at the height of the Polschuhspalts the objective lens is not mandatory.
- the object table (1 1) is adjustable by means not shown adjusting in three zuenkenkrechten directions, which is indicated by the arrows (12), and in addition to a perpendicular to the particle-axis (7) axis tiltable.
- a diode laser (15) which generates a collimated or focused light beam, is accommodated on an adjusting unit (14).
- the opening at which the diode laser (15) is received. can be a flange opening.
- the diode laser contains a laser diode (17) with an upstream optical system (18), which provide a light beam along an axis (19).
- the laser diode upstream optics (18) generates a focus of the laser beam at the point along the laser beam axis (19) at which this intersects the particle-optical beam axis (7).
- About the adjusting unit (14) of the diode laser (15) in both directions perpendicular to the laser beam axis (19) is adjustable.
- the inclusion of the diode laser (15) on the sample chamber (1) relative to the particle-optical column (2) is such that the planes in which, depending on the positioning of the diode laser (15) by means of the adjusting unit (14), the beam axis (19) of the laser beam is always at an inclination angle ( ⁇ ) to the particle-optical axis (7) lie, wherein this inclination angle ( ⁇ ) is not equal to 0 ° and 90 °, and preferably in the range 20 ° to 70 °.
- the beam axis (19) of the diode laser is then adjusted so that the beam axis (19) of the laser beam intersects the particle-optical axis (7) at a predefined position.
- the camera chip (22) is also sensitive to the wavelength of the diode laser (15).
- the optical axis (24) of the camera module is likewise inclined at an angle ( ⁇ ) to the particle-optical axis (7), whereby the angle of inclination ( ⁇ ) of the camera module (21) can deviate from the angle of inclination ( ⁇ ) of the diode laser (15) ,
- the angle of inclination ( ⁇ ) of the camera module (21) is selected such that the surface of the object table (11) can be observed obliquely from above with the camera chip (22) and an inclined view of the object table on a monitor or display (26) (1 1) and an object recorded on it can be displayed.
- a chamber illumination is provided by which the area around the stage is illuminated with light of a wavelength for which the camera chip (22) is sensitive.
- the output signals of the camera module (21) are first fed to a control device (27), by which further information can be superimposed on the images recorded with the camera chip (22), so that corresponding overlaid images are displayed on the monitor (26).
- a marking in the form of a line is generated by the control device (27), which indicates the position of the particle-optical axis (7) in the image taken with the camera chip (22).
- the extent of the marking is greater in the direction of the particle-optical axis than perpendicular to the particle-optical axis (7).
- the positioning of the object then takes place with the aid of the system according to the invention according to the method illustrated in FIG. 4 as a block diagram.
- the point of impact of the laser module (15) is generated
- Light beam searched on the object or the stage A corresponding superimposed image of an object (32) recorded on the object table (11) is shown in FIG. 3.
- the deposit between the point of impact (31) of the laser beam and the mark (30) indicates that the surface of the object (32) is not yet at the desired working distance along the particle-optical axis (7).
- the drive of the object table (11) firstly displaces it in the direction of the optical axis until the point of impact (31) of the laser beam on the marking
- a second step (42) the object (25) is displaced perpendicular to the particle-optical axis (7) by means of the other drives of the stage (11) until the mark (30) in the optical image recorded with the camera chip (22) ) is in the range of an object detail of interest. If the position of the point of incidence (31) of the laser beam moves away from the marking in this movement perpendicular to the particle-optical axis, then the first step (41) is repeated once again and the object table is moved in the direction of the particle-optical axis (7) until the position of the object of impact
- the switchover to particle-optical microscopy is carried out by signals having a detector (33). be detected and used for image formation, which arise by irradiation of the object with primary particles.
- Such induced by partial irradiation secondary particles can backscattered electrons.
- Be secondary electrons or light quanta which are either triggered by the object itself or caused by interaction of backscattered or secondary electrons with gas molecules in the sample chamber.
- the initial adjustment of the system can be done using an object that has a prominent location, such as an acute-angled edge. Under particle irradiation, this point is first sought and moved by moving the object table this prominent point in the direction of the particle-optical axis (7) until this striking object location is in the desired working distance in the direction of the particle-optical axis, for example by the signals generated by the particle beam show maximum lateral resolution. Subsequently, the diode laser (15) is then positioned by means of the adjusting unit so that in the image taken with the camera chip (22) the light beam impinges on the object precisely at the striking object location.
- this point is first sought and moved by moving the object table this prominent point in the direction of the particle-optical axis (7) until this striking object location is in the desired working distance in the direction of the particle-optical axis, for example by the signals generated by the particle beam show maximum lateral resolution.
- the diode laser (15) is then positioned by means of the adjusting unit so that in the image taken
- a line is then established in the video image by means of the control device (27) as a marking, which runs through the striking object point and runs in the direction of the center of the objective lens.
- the set up mark is then saved as an annotation and is later available when objects with less concise object details are to be microscoped.
- the marking can be produced particularly simply if the camera chip (22) is received in such a way that it is oriented on the sample chamber such that the vertical direction in the image recorded with the camera chip coincides with the direction of the particle-optical axis.
- the marker (30) is then simply in the image, the image column or a part of the image column, in which the distinctive object location lies.
- the point of intersection of the light beam with the particle-optical axis can be adjusted to any desired working distance desired by the customer - that is, to any desired position along the particle-optical axis in practice.
- the power supply of the diode laser can be varied via a variable current source or a resistance potentiometer, so that the brightness of the laser beam is variable and thereby the current brightness conditions and possibly a different Reflection behavior of the object for the light of the laser beam and the ER light of the chamber illumination can be adjusted. If required, the brightness control of the diode laser can also be automated by software.
- an auxiliary module according to the present invention can be easily retrofitted to existing devices. It only needs to be recorded on a free port of the sample chamber, the laser module with the required adjustment.
- the coupling of the laser beam can also be done by a glass plate, which closes the sample chamber vacuum-tight with respect to the outside world.
- a video mixing device has to be added, with which the desired mark can be generated and stored in the video image of the camera.
- the optical axis (24) of the camera module and the laser beam axis (19) are aligned perpendicular or nearly perpendicular to one another. This results in a particularly clear displacement of the point of impingement of the laser focus on the object in the image taken with the camera as a function of a change in the position of the object table in the direction of the particle-optical axis.
- the optical axis (24) of the camera module and the laser beam axis (19) should include an angle that deviates significantly from 0 ° and 180 °, for example in the range between 45 ° and 135 °.
- the illumination device is designed as a diode laser which generates a focused light beam.
- the illumination device can also be realized otherwise, for example by an incandescent lamp or an LED. which, with the aid of an upstream optical system, generates a focused light beam whose focus ideally lies at the intersection of the light beam with the particle-optical axis.
- a diode laser instead of a diode laser, a gas laser, a solid-state laser, a fiber laser or a fiber-coupled light source can be used.
- the entire diode laser can also be arranged within the sample chamber.
- the fiber-coupled light source when using a fiber-coupled light source, it can be arranged outside the sample chamber and the fiber can be guided into the sample chamber. In this case, the exit end of the fiber would then be received at an adjusting device to be arranged within the sample chamber.
- infrared illumination is provided as chamber illumination and, as a camera, a camera sensitive to IR is provided.
- the chamber illumination may also have a different wavelength; Accordingly, the camera should then be sensitive to a different wavelength or a different wavelength range.
- the diode laser does not have to emit in the infrared spectral range but can have any wavelength. All that is required is that the camera is simultaneously sensitive to both the chamber illumination and the light of the illumination device of the focusing and positioning auxiliary device.
- the focusing and positioning auxiliary device is to be used universally for sample chambers of different sizes, it is useful if the position of the laser focus along the laser beam axis (19) can be varied by the optics (18). If, on the other hand, the diode laser can always be arranged at almost the same distance from the point of intersection of the laser beam axis with the particle-optical axis even with different sample chambers, a diode laser with a fixed optics and resulting fixed position of the laser focus along the laser beam axis can also be used.
- the detector (33) is arranged in the sample chamber for signals which arise due to irradiation of the object with primary particles.
- this detector can also be arranged in the particle-optical column, for example in the region of the objective facing the particle source (so-called in-lens detector), or one or more detectors in the sample chamber and another detector in the particle-optical column be arranged.
- the detector (33) for signals which are generated by irradiation of the object with primary particles can be, for example, an Everhardt-Thornley detector, an EDX detector or a light detector or an electrode.
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Laser Beam Processing (AREA)
- Microscoopes, Condenser (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006004950 | 2006-02-03 | ||
| PCT/EP2007/000759 WO2007090537A2 (de) | 2006-02-03 | 2007-01-30 | Fokussier- und positionierhilfseinrichtung für ein teilchenoptisches rastermikroskop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1979926A2 true EP1979926A2 (de) | 2008-10-15 |
Family
ID=38294142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07703114A Withdrawn EP1979926A2 (de) | 2006-02-03 | 2007-01-30 | Fokussier- und positionierhilfseinrichtung für ein teilchenoptisches rastermikroskop |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7888643B2 (de) |
| EP (1) | EP1979926A2 (de) |
| JP (1) | JP2009525571A (de) |
| WO (1) | WO2007090537A2 (de) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008001812B4 (de) * | 2008-05-15 | 2013-05-29 | Carl Zeiss Microscopy Gmbh | Positioniereinrichtung für ein Teilchenstrahlgerät |
| US8227752B1 (en) | 2011-02-17 | 2012-07-24 | Carl Zeiss Nts Gmbh | Method of operating a scanning electron microscope |
| US8487252B2 (en) | 2010-09-29 | 2013-07-16 | Carl Zeiss Nts Gmbh | Particle beam microscope and method for operating the particle beam microscope |
| GB2484197A (en) * | 2010-09-29 | 2012-04-04 | Zeiss Carl Nts Gmbh | Particle beam microscope and method of operating the particle microscope |
| NL2013262B1 (en) * | 2014-07-25 | 2016-09-09 | Delmic B V | Method for inspecting a sample using an assembly comprising a scanning electron microscope and a light microscope. |
| JP6659290B2 (ja) | 2015-09-30 | 2020-03-04 | 株式会社日立ハイテクサイエンス | 試料位置合わせ方法および荷電粒子ビーム装置 |
| DE102017201706B4 (de) * | 2017-02-02 | 2025-10-23 | Carl Zeiss Microscopy Gmbh | Teilchenstrahlgerät mit einer Abbildungseinrichtung zur Abbildung eines Objekts und zur Abbildung einer Baueinheit in dem Teilchenstrahlgerät sowie Verfahren zum Betrieb des Teilchenstrahlgeräts |
| US11545334B2 (en) | 2018-08-02 | 2023-01-03 | Hitachi High-Tech Corporation | Charged particle beam device |
| JP7065253B2 (ja) * | 2019-03-12 | 2022-05-11 | 株式会社日立ハイテク | 荷電粒子線装置 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001077004A (ja) * | 1999-09-03 | 2001-03-23 | Hitachi Ltd | 露光装置および電子線露光装置 |
| JP2004319518A (ja) * | 2004-07-22 | 2004-11-11 | Topcon Corp | 走査型電子顕微鏡装置 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2498767A1 (fr) * | 1981-01-23 | 1982-07-30 | Cameca | Micro-analyseur a sonde electronique comportant un systeme d'observation a double grandissement |
| JPH077653B2 (ja) | 1987-04-11 | 1995-01-30 | 株式会社日立製作所 | 走査電子顕微鏡による観察装置 |
| JPH0754684B2 (ja) * | 1987-08-28 | 1995-06-07 | 株式会社日立製作所 | 電子顕微鏡 |
| JPH03141544A (ja) | 1989-10-26 | 1991-06-17 | Brother Ind Ltd | レーザ変位計を備えた走査型電子顕微鏡 |
| US5025165A (en) * | 1990-03-26 | 1991-06-18 | At&T Bell Laboratories | Method for producing a semiconductor device using an electron beam exposure tool and apparatus for producing the device |
| US5216235A (en) * | 1992-04-24 | 1993-06-01 | Amray, Inc. | Opto-mechanical automatic focusing system and method |
| JP2875940B2 (ja) * | 1993-08-26 | 1999-03-31 | 株式会社日立製作所 | 試料の高さ計測手段を備えた電子ビーム装置 |
| JP3216474B2 (ja) * | 1995-03-30 | 2001-10-09 | 株式会社日立製作所 | 走査型電子顕微鏡 |
| US5905266A (en) * | 1996-12-19 | 1999-05-18 | Schlumberger Technologies, Inc. | Charged particle beam system with optical microscope |
| JPH11250847A (ja) * | 1998-02-27 | 1999-09-17 | Hitachi Ltd | 収束荷電粒子線装置およびそれを用いた検査方法 |
| US6335532B1 (en) * | 1998-02-27 | 2002-01-01 | Hitachi, Ltd. | Convergent charged particle beam apparatus and inspection method using same |
| JP2000180391A (ja) | 1998-12-11 | 2000-06-30 | Sony Corp | 電子顕微鏡および欠陥形状確認方法 |
| JP2000228166A (ja) * | 1999-02-05 | 2000-08-15 | Horon:Kk | 試料観察装置 |
| US6633831B2 (en) * | 2000-09-20 | 2003-10-14 | Kla Tencor Technologies | Methods and systems for determining a critical dimension and a thin film characteristic of a specimen |
| JP4610798B2 (ja) * | 2001-06-19 | 2011-01-12 | エスアイアイ・ナノテクノロジー株式会社 | レーザ欠陥検出機能を備えた走査型電子顕微鏡とそのオートフォーカス方法 |
| US6683316B2 (en) * | 2001-08-01 | 2004-01-27 | Aspex, Llc | Apparatus for correlating an optical image and a SEM image and method of use thereof |
| JP2004053550A (ja) | 2002-07-24 | 2004-02-19 | Suruga Seiki Kk | 半導体デバイス検査装置 |
-
2007
- 2007-01-30 WO PCT/EP2007/000759 patent/WO2007090537A2/de not_active Ceased
- 2007-01-30 JP JP2008552732A patent/JP2009525571A/ja active Pending
- 2007-01-30 EP EP07703114A patent/EP1979926A2/de not_active Withdrawn
-
2008
- 2008-08-01 US US12/222,087 patent/US7888643B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001077004A (ja) * | 1999-09-03 | 2001-03-23 | Hitachi Ltd | 露光装置および電子線露光装置 |
| JP2004319518A (ja) * | 2004-07-22 | 2004-11-11 | Topcon Corp | 走査型電子顕微鏡装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007090537A3 (de) | 2008-02-14 |
| WO2007090537A2 (de) | 2007-08-16 |
| US20080315120A1 (en) | 2008-12-25 |
| US7888643B2 (en) | 2011-02-15 |
| JP2009525571A (ja) | 2009-07-09 |
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