EP1471539A1 - Abbildungssystem für ein, auf extrem ultravioletter (EUV) Strahlung basierendem Mikroskop - Google Patents
Abbildungssystem für ein, auf extrem ultravioletter (EUV) Strahlung basierendem Mikroskop Download PDFInfo
- Publication number
- EP1471539A1 EP1471539A1 EP03016371A EP03016371A EP1471539A1 EP 1471539 A1 EP1471539 A1 EP 1471539A1 EP 03016371 A EP03016371 A EP 03016371A EP 03016371 A EP03016371 A EP 03016371A EP 1471539 A1 EP1471539 A1 EP 1471539A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- imaging system
- imaging
- diffractive
- euv
- radiation
- 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.)
- Granted
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Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/06—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K7/00—Gamma- or X-ray microscopes
Definitions
- the present invention relates to a reflective imaging system for a X-ray microscope for examining an object in an object plane, the object with rays of a wavelength ⁇ 100 nm, in particular ⁇ 30 nm illuminated and enlarged in an image plane.
- the microscopic examination of objects with X-rays is proposed especially important in the semiconductor industry. Smaller structure sizes consequently require ever higher resolutions, which can only be achieved with a Shortening the examination wavelength can be achieved. Especially this is important for the microscopic inspection of masks for the Lithography process.
- the lithography uses extremely ultraviolet (EUV) radiation is the most promising solution for chip production in the next years.
- EUV extremely ultraviolet
- a reflective X-ray microscope for examining an object for microlithography in an object plane with radiation of a wavelength ⁇ 100 nm, in particular ⁇ 30 nm, is known from JP 2001116900.
- This in X-ray microscope disclosed in this application is a Schwarzschild system with a concave first mirror and a convex second Mirror.
- the Beam path for examining the object on the object is not telecentric, see above that an examination in reflection, for example of EUV reflection masks, is made possible. This system is very disadvantageous large length to achieve large image scales.
- FIGS Applications DE 102 20 815 and DE 102 20 816 are described.
- the Imaging optics designed as a purely reflective system and in terms of less Length optimized at high magnifications. This will u. a. through the Using highly aspherical mirrors achieved.
- a disadvantage of these Arrangements is that the manufacturing tolerances for the aspherical mirror to achieve a high image quality are extremely demanding and therefore high Requirements to be met by manufacturing technology and measuring technology.
- the object of the present invention is an imaging system to develop for an X-ray microscope which the in the prior art avoids known disadvantages. Furthermore, a high image quality should can be achieved with a reasonable manufacturing effort.
- the object is characterized by the features of the independent Claims resolved. Preferred further developments and refinements are Subject of the dependent claims.
- the proposed imaging system includes all of one imaging Optical elements belonging to optics and generated by the extreme ultraviolet (EUV) radiation a corresponding intermediate image. This can further processed by further imaging systems, d. H. further enlarged become.
- EUV extreme ultraviolet
- Imaging system can be used for example in photolithography.
- At least one of the imaging optical elements 2 and 3 present in the beam path has a diffractive-reflective structure.
- the diffractive-reflective structure is applied to a spherical or a flat base surface of one or both imaging optical elements 2 and 3 . Concave or convex curvatures are possible as a spherical base.
- the second imaging system can be based on an x-ray image, one electro-optic imaging or an illustration showing radiation above 200nm used are based.
- the second can Imaging system also another imaging optical element with a spherical convex base without a diffractive structure.
- the imaging system according to the invention is preferably for wavelengths in the range less than 30nm, with a magnification of 5 - 1000x and one Length of less than 3m provided.
- the imaging system has two imaging optical elements 2 and 3 , each with a diffractive-reflective structure, the first imaging optical element 2 having a concave base area and the second imaging optical element 3 having a convex base area for the respective diffractive surface. have reflective structure.
- the imaging optical elements 2 and 3 are arranged in such a way that the optical paths cross once.
- the optical axis of the imaging system is inclined to the object normal.
- the imaging optical elements 2 and 3 can also be arranged such that the optical paths do not cross.
- Imaging system as the basis for an inspection system for lithography masks be used.
- imaging system as the basis for an inspection system for lithography masks be used.
- the first imaging optical element 2 with a spherically concave base surface has, for example, a diffractive-reflective structure with approximately 240 lines / mm
- the second imaging optical element 3 with a spherically convex base surface has a diffractive-reflective structure with approximately 660 lines / mm.
- the imaging optical elements 2 and 3 are arranged in such a way that the optical paths cross once.
- FIG. 1 and FIG. 2 the corresponding ray profiles in the imaging system are shown, starting from the object 1 to be examined, via the imaging optical elements 2 and 3 , up to the intermediate image 4 generated.
- the beam path shown relates to an imaging system for a microscope based on extremely ultraviolet (EUV) radiation or a corresponding inspection system for lithography masks.
- EUV extremely ultraviolet
- FIG. 4 shows the schematic overall view of an inspection system for lithography masks based on EUV radiation.
- EUV radiation In contrast to UV radiation, EUV radiation is used in almost all of them Materials very strongly absorbed. Because the absorption length in air at Normal pressure is far below 1 mm, the EUV radiation can only in a vacuum almost lossless over the distances required for EUV lithography spread.
- the EUV radiation is focused on the object 1 by the illumination optics 6.
- the EUV radiation reflected by the object 1 is focused by the imaging optics 7 as an intermediate image 4 onto a converter layer.
- the subsystem according to the invention, starting from the object level 1 to the intermediate image 4 , on the converter layer is also referred to as the first subsystem and is based entirely on the EUV radiation.
- the intermediate image 4 generated in this way can be further enlarged, for example, by a second subsystem.
- the second subsystem can be based on both EUV radiation and a different wavelength.
- the EUV radiation is converted, for example, into VIS radiation from the converter layer (intermediate image 4 ).
- This VIS radiation is imaged on a camera chip 9 by a further imaging optics 8 used as a second subsystem, which is simultaneously designed as a window of the vacuum chamber 10 .
- the camera chip 9 is used to control the radiation.
- an imaging system for Provided which the disadvantages known in the prior art avoids and ensures a high image quality.
- the manufacturing effort remains justifiable through the exclusive use of spherical mirrors.
- the microscopic examination of objects with X-rays, especially with extremely ultraviolet (EUV) radiation is used mainly in Semiconductor industry increasingly important. Require smaller structure sizes consequently ever higher resolutions, which only by one Shortening the examination wavelength can be achieved. Especially this is important for the microscopic inspection of masks for the Lithography process.
- EUV extremely ultraviolet
- X-ray microscopy is particularly important in the case of people such as for example the so-called AIMS (Aenai Imaging Measurement).
- AIMS Azai Imaging Measurement
- the lithography stepper is replaced by a less expensive one and simulated simpler microscopic arrangement. It is important that the Figure with the same wavelength of e.g. B. 13.5nm, the same Lighting conditions and the same image quality as with an EUV stepper is produced. In contrast to the stepper, the image field is approx. 10 ⁇ m much smaller instead of several mm. Another difference is that the mask typically magnified 10 - 1000 times on a camera become.
Abstract
Description
- Figur 1:
- Strahlenverlauf im ersten Subsystem des Mikroskops,
- Figur 2:
- einen vergrößerten Ausschnitt des Strahlenverlaufes im ersten Subsystem des Mikroskops und
- Figur 3:
- eine schematische Gesamtansicht eines Inspektionssystems für Lithographiemasken, basierend auf EUV-Strahlung.
Claims (9)
- Abbildungssystem für ein, auf extrem ultravioletter (EUV) Strahlung basierendem Mikroskop mit Wellenlängen im Bereich < 100nm, mit einer Vergrößerung von 0,1 - 1000x und einer Baulänge < 5m, bei dem mindestens eines der im Strahlengang vorhandenen abbildenden optischen Elemente eine diffraktiv-reflektive Struktur aufweist.
- Abbildungssystem nach Anspruch 1, bei dem die diffraktiv-reflektive Struktur auf einer sphärischen oder einer planen Grundfläche aufgebracht ist und eine nicht rotationssymmetrische, asymmetrische Form aufweist.
- Abbildungssystem nach Anspruch 1 und 2, bei dem die sphärischen Grundflächen konkav oder konvex ausgeprägt ist.
- Abbildungssystem nach mindestens einem der vorgenannten Ansprüche, bei dem zwei abbildenden optischen Elemente mit jeweils einer diffraktiv-reflektiven Struktur versehen sind, wobei das erste abbildende optische Element eine konkave und das zweite abbildende optische Element eine konvexe sphärische Grundfläche für die jeweilige diffraktiv-reflektive Struktur aufweisen.
- Abbildungssystem nach mindestens einem der vorgenannten Ansprüche, bei dem die optische Achse des Abbildungssystems zur Objektnormalen geneigt ist.
- Abbildungssystem nach mindestens einem der vorgenannten Ansprüche, bei dem die abbildenden optischen Elemente so angeordnet sind, dass sich die optischen Wege mindestens einmal kreuzen.
- Abbildungssystem nach mindestens einem der vorgenannten Ansprüche, bei dem die abbildenden optischen Elemente so angeordnet sind, dass sich die optischen Wege nicht kreuzen.
- Abbildungssystem nach mindestens einem der vorgenannten Ansprüche, bei dem ein weiteres Abbildungssystem nachgeordnet wird, um eine Gesamtvergrößerung von 5 - 10000x zu realisieren.
- Inspektionssystem für Lithographiemasken basierend auf einem Abbildungssystem nach mindestens einem der vorgenannten Ansprüche, bei dem ein erstes abbildendes optisches Element mit sphärisch konkaver Grundfläche eine diffraktiv-reflektiv wirkende Struktur mit ca. 240 Linien/mm und ein zweites abbildendes optisches Element mit sphärisch konvexer Grundfläche eine diffraktiv-reflektiv wirkende Struktur mit ca. 660 Linien/mm aufweisen und sich die optischen Wege einmal kreuzen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10319269 | 2003-04-25 | ||
DE10319269A DE10319269A1 (de) | 2003-04-25 | 2003-04-25 | Abbildungssystem für ein, auf extrem ultravioletter (EUV) Strahlung basierendem Mikroskop |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1471539A1 true EP1471539A1 (de) | 2004-10-27 |
EP1471539B1 EP1471539B1 (de) | 2006-08-23 |
Family
ID=32946454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03016371A Expired - Lifetime EP1471539B1 (de) | 2003-04-25 | 2003-07-19 | Abbildungssystem für ein, auf extrem ultravioletter (EUV) Strahlung basierendem Mikroskop |
Country Status (4)
Country | Link |
---|---|
US (1) | US6894837B2 (de) |
EP (1) | EP1471539B1 (de) |
AT (1) | ATE337605T1 (de) |
DE (2) | DE10319269A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009118130A1 (de) * | 2008-03-27 | 2009-10-01 | Carl Zeiss Sms Gmbh | Mikroskop und mikroskopierverfahren zur untersuchung eines reflektierenden objektes |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE488013T1 (de) * | 2002-05-10 | 2010-11-15 | Zeiss Carl Smt Ag | Reflektives roentgenmikroskop zur untersuchung von objekten mit wellenlaengen = 100nm in reflexion |
DE102010029050A1 (de) | 2010-05-18 | 2011-03-31 | Carl Zeiss Smt Gmbh | Vergrößernde abbildende Optik sowie Metrologiesystem mit einer derartigen abbildenden Optik |
DE102011081914A1 (de) | 2011-08-31 | 2012-09-06 | Carl Zeiss Smt Gmbh | Beleuchtungsoptik zur Beleuchtung eines in einem Objektfeld anordenbaren, strukturierten Objektes |
DE102013211269A1 (de) | 2013-06-17 | 2014-04-30 | Carl Zeiss Smt Gmbh | Beleuchtungsoptik zur Beleuchtung eines in einem Objektfeld anordenbaren, strukturierten Objektes sowie Metrologiesystem für die Untersuchung eines strukturierten Objektes |
DE102019124919B4 (de) | 2019-09-17 | 2021-08-26 | Ri Research Instruments Gmbh | Mikroskopisches System zur Prüfung von Strukturen und Defekten auf EUV-Lithographie-Photomasken |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5719915A (en) * | 1995-03-23 | 1998-02-17 | Agency Of Industrial Science And Technology | X-ray dispersing/focusing device and method of producing same |
US6118577A (en) * | 1998-08-06 | 2000-09-12 | Euv, L.L.C | Diffractive element in extreme-UV lithography condenser |
US6522717B1 (en) * | 1999-08-11 | 2003-02-18 | Nikon Corporation | Reflective-type soft x-ray microscope |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH02210299A (ja) * | 1989-02-10 | 1990-08-21 | Olympus Optical Co Ltd | X線用光学系及びそれに用いる多層膜反射鏡 |
JP2865257B2 (ja) * | 1989-03-07 | 1999-03-08 | オリンパス光学工業株式会社 | シュヴアルツシルド光学系 |
JP2945431B2 (ja) * | 1990-03-01 | 1999-09-06 | オリンパス光学工業株式会社 | 結像型x線顕微鏡 |
JP2921038B2 (ja) | 1990-06-01 | 1999-07-19 | キヤノン株式会社 | X線を用いた観察装置 |
DE4027285A1 (de) * | 1990-08-29 | 1992-03-05 | Zeiss Carl Fa | Roentgenmikroskop |
US5291339A (en) * | 1990-11-30 | 1994-03-01 | Olympus Optical Co., Ltd. | Schwarzschild optical system |
JPH04353800A (ja) * | 1991-05-31 | 1992-12-08 | Olympus Optical Co Ltd | 軟x線顕微鏡 |
US5177774A (en) * | 1991-08-23 | 1993-01-05 | Trustees Of Princeton University | Reflection soft X-ray microscope and method |
US5384817A (en) * | 1993-07-12 | 1995-01-24 | Ovonic Synthetic Materials Company | X-ray optical element and method for its manufacture |
JP3167095B2 (ja) * | 1995-07-04 | 2001-05-14 | キヤノン株式会社 | 照明装置とこれを有する露光装置や顕微鏡装置、ならびにデバイス生産方法 |
US6469827B1 (en) * | 1998-08-06 | 2002-10-22 | Euv Llc | Diffraction spectral filter for use in extreme-UV lithography condenser |
DE10130212A1 (de) | 2001-06-22 | 2003-01-02 | Zeiss Carl Jena Gmbh | Objektiv |
DE10220816A1 (de) | 2002-05-10 | 2003-11-20 | Zeiss Carl Microelectronic Sys | Reflektives Röntgenmikroskop und Inspektionssystem zur Untersuchung von Objekten mit Wellenlängen 100 nm |
DE10220815A1 (de) | 2002-05-10 | 2003-11-20 | Zeiss Carl Microelectronic Sys | Reflektives Röntgenmikroskop und Inspektionssystem zur Untersuchung von Objekten mit Wellenlängen 100 nm |
US6801298B2 (en) * | 2002-07-25 | 2004-10-05 | Intel Corporation | Light condenser |
-
2003
- 2003-04-25 DE DE10319269A patent/DE10319269A1/de not_active Ceased
- 2003-07-19 EP EP03016371A patent/EP1471539B1/de not_active Expired - Lifetime
- 2003-07-19 AT AT03016371T patent/ATE337605T1/de not_active IP Right Cessation
- 2003-07-19 DE DE50304739T patent/DE50304739D1/de not_active Expired - Fee Related
- 2003-07-24 US US10/626,130 patent/US6894837B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5719915A (en) * | 1995-03-23 | 1998-02-17 | Agency Of Industrial Science And Technology | X-ray dispersing/focusing device and method of producing same |
US6118577A (en) * | 1998-08-06 | 2000-09-12 | Euv, L.L.C | Diffractive element in extreme-UV lithography condenser |
US6522717B1 (en) * | 1999-08-11 | 2003-02-18 | Nikon Corporation | Reflective-type soft x-ray microscope |
Non-Patent Citations (1)
Title |
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SNIGIREV A ET AL: "High energy X-ray phase contrast microscopy using a circular Bragg-Fresnel lens", OPTICS COMMUNICATIONS, NORTH-HOLLAND PUBLISHING CO. AMSTERDAM, NL, vol. 135, no. 4, 15 February 1997 (1997-02-15), pages 378 - 384, XP004016534, ISSN: 0030-4018 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009118130A1 (de) * | 2008-03-27 | 2009-10-01 | Carl Zeiss Sms Gmbh | Mikroskop und mikroskopierverfahren zur untersuchung eines reflektierenden objektes |
Also Published As
Publication number | Publication date |
---|---|
ATE337605T1 (de) | 2006-09-15 |
US6894837B2 (en) | 2005-05-17 |
US20040212891A1 (en) | 2004-10-28 |
EP1471539B1 (de) | 2006-08-23 |
DE50304739D1 (de) | 2006-10-05 |
DE10319269A1 (de) | 2004-11-25 |
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