Source: http://www.google.es/patents/US20090073411
Timestamp: 2017-11-24 13:38:55
Document Index: 480323131

Matched Legal Cases: ['Application No. 60', 'Application No. 61', 'Application No. 2005', 'Application No. 2005', 'Application No. 2003', 'Application No. 2003', 'Application No. 2008', 'Application No. 2008']

Patente US20090073411 - Illumination optical system, exposure apparatus, optical element and ... - Google Patentes
An illumination optical system which illuminates a surface to be illuminated on the basis of light from a light source has a first optical path in which a diffractive optical element can be arranged at a first position thereof; a second optical path in which a spatial light modulator with a plurality...http://www.google.es/patents/US20090073411?utm_source=gb-gplus-sharePatente US20090073411 - Illumination optical system, exposure apparatus, optical element and manufacturing method thereof, and device manufacturing method
Número de publicación US20090073411 A1
Número de solicitud US 12/191,821
También publicado como CN101743497A, CN102385258A, CN102385258B, CN103488056A, CN103488056B, EP2188664A2, EP2188664B1, EP2278380A1, EP2278380B1, EP2631699A1, EP2631699B1, US8451427, US9057963, US9366970, US20130229639, US20140347645, WO2009035129A2, WO2009035129A3
Número de publicación 12191821, 191821, US 2009/0073411 A1, US 2009/073411 A1, US 20090073411 A1, US 20090073411A1, US 2009073411 A1, US 2009073411A1, US-A1-20090073411, US-A1-2009073411, US2009/0073411A1, US2009/073411A1, US20090073411 A1, US20090073411A1, US2009073411 A1, US2009073411A1
Inventores Osamu Tanitsu
Citas de patentes (63), Citada por (64), Clasificaciones (18), Eventos legales (2)
US 20090073411 A1
a second optical path in which a spatial light modulator with a plurality of optical elements arrayed two-dimensionally and controlled individually can be arranged at a second position thereof; and
a third optical path which is an optical path of light having passed via at least one of the first optical path and the second optical path and in which a distribution forming optical system is arranged;
wherein the distribution forming optical system forms a predetermined light intensity distribution on an illumination pupil located in the third optical path, based on the light having passed via at least one of the first and second optical paths.
2. The illumination optical system according to claim 1, wherein the second position is the same position as the first position or a position optically conjugate with the first position.
3. The illumination optical system according to claim 1, comprising a selector for switching between an optical path in which the light from the light source is guided to the diffractive optical element arranged in the first optical path and an optical path in which the light from the light source is guided to the spatial light modulator arranged at the second position.
4. The illumination optical system according to claim 3, wherein the selector inserts or retracts a plane mirror or a prism mirror at or from the second position, thereby implementing selection of the optical path.
5. The illumination optical system according to claim 3, wherein the selector comprises a reflecting mirror which can be inserted at or retracted from a position immediately before the spatial light modulator.
6. An illumination optical system which illuminates a surface to be illuminated on the basis of light from a light source, the illumination optical system comprising:
a spatial light modulator with a plurality of optical elements arrayed two-dimensionally and controlled individually; and
a distribution forming optical system which forms a predetermined light intensity distribution on an illumination pupil, based on light having passed via the spatial light modulator;
wherein the plurality of optical elements of the spatial light modulator are selectively located between a position in an optical path of the illumination optical system and a position off the optical path of the illumination optical system.
7. The illumination optical system according to claim 6, wherein the spatial light modulator can be inserted into or retracted from the optical path of the illumination optical system.
8. The illumination optical system according to claim 6, comprising a reflecting surface arranged so that it can be inserted on or retracted from an entrance side of the plurality of optical elements of the spatial light modulator.
9. An illumination optical system which illuminates a surface to be illuminated on the basis of light from a light source, the illumination optical system comprising:
a diffractive optical element which can be inserted at a first position in an optical path of the illumination optical system;
a spatial light modulator with a plurality of optical elements arrayed two-dimensionally and controlled individually, which can be inserted at the first position or at a second position optically conjugate with the first position; and
a distribution forming optical system which forms a predetermined light intensity distribution on an illumination pupil, based on light having passed via at least one of the diffractive optical element and the spatial light modulator.
10. The illumination optical system according to claim 9, wherein the spatial light modulator can be replaced with a plane mirror or a prism mirror at the second position.
11. The illumination optical system according to claim 10, comprising a path folding reflecting mirror which is arranged immediately before the spatial light modulator and which sets an angle of incidence of light to the spatial light modulator to not more than a predetermined angle.
12. The illumination optical system according to claim 10, which comprises a polarization beam splitter arranged in an optical path between the light source and the spatial light modulator, and a quarter wave plate arranged in an optical path between the polarization beam splitter and the spatial light modulator, wherein light incident to the polarization beam splitter is guided via the quarter wave plate, the spatial light modulator, the quarter wave plate, and the polarization beam splitter to the surface to be illuminated.
13. The illumination optical system according to claim 9, comprising a control unit which controls arrangement of at least one of the diffractive optical element and the spatial light modulator in the optical path.
14. The illumination optical system according to claim 13, wherein the control unit arranges either one of the diffractive optical element and the spatial light modulator at the first position.
15. The illumination optical system according to claim 13, wherein the control unit arranges the diffractive optical element at the first position and the spatial light modulator at the second position.
16. The illumination optical system according to claim 9, wherein the spatial light modulator includes a plurality of mirror elements arrayed two-dimensionally, and a driving unit which individually controls and drives postures of the plurality of mirror elements.
17. The illumination optical system according to claim 16, wherein the driving unit continuously or discretely changes orientations of the plurality of mirror elements.
18. The illumination optical system according to claim 9, which is used in combination with a projection optical system which forms a surface optically conjugate with the surface to be illuminated, wherein the illumination pupil is at a position optically conjugate with an aperture stop of the projection optical system.
19. An exposure apparatus comprising the illumination optical system as set forth in claim 9, for illuminating a predetermined pattern, the exposure apparatus performing an exposure of the predetermined pattern on a photosensitive substrate.
effecting the exposure of the predetermined pattern on the photosensitive substrate, using the exposure apparatus as set forth in claim 19;
21. The illumination optical system according to claim 1, wherein the spatial light modulator includes a plurality of mirror elements arrayed two-dimensionally, and a driving unit which individually controls and drives postures of the plurality of mirror elements.
22. The illumination optical system according to claim 21, wherein the driving unit continuously or discretely changes orientations of the plurality of mirror elements.
23. The illumination optical system according to claim 1, which is used in combination with a projection optical system which forms a surface optically conjugate with the surface to be illuminated, wherein the illumination pupil is at a position optically conjugate with an aperture stop of the projection optical system.
24. An exposure apparatus comprising the illumination optical system as set forth in claim 1, for illuminating a predetermined pattern, the exposure apparatus performing an exposure of the predetermined pattern on a photosensitive substrate.
effecting the exposure of the predetermined pattern on the photosensitive substrate, using the exposure apparatus as set forth in claim 24;
26. The illumination optical system according to claim 6, wherein the spatial light modulator includes a plurality of mirror elements arrayed two-dimensionally, and a driving unit which individually controls and drives postures of the plurality of mirror elements.
27. The illumination optical system according to claim 26, wherein the driving unit continuously or discretely changes orientations of the plurality of mirror elements.
28. The illumination optical system according to claim 6, which is used in combination with a projection optical system which forms a surface optically conjugate with the surface to be illuminated, wherein the illumination pupil is at a position optically conjugate with an aperture stop of the projection optical system.
29. An exposure apparatus comprising the illumination optical system as set forth in claim 6, for illuminating a predetermined pattern, the exposure apparatus performing an exposure of the predetermined pattern on a photosensitive substrate.
effecting the exposure of the predetermined pattern on the photosensitive substrate, using the exposure apparatus as set forth in claim 29;
31. A method for manufacturing an optical element for forming a predetermined illumination pupil luminance distribution on the basis of light from a light source, the optical element being applied to an exposure apparatus performing an exposure of a predetermined pattern on a substrate with light from the predetermined illumination pupil luminance distribution, the method comprising:
a first step in which the predetermined pattern is set in the exposure apparatus;
a second step in which the light from the light source is modulated by a spatial light modulator, for forming a required illumination pupil luminance distribution;
a third step in which the exposure of the predetermined pattern set in the exposure apparatus is effected on the substrate, based on the light modulated by the spatial light modulator;
a fourth step in which an exposed pattern exposed on the substrate is measured;
a fifth step in which the illumination pupil luminance distribution is adjusted based on the exposed pattern measured in the fourth step; and
a sixth step in which the optical element is manufactured based on information of the illumination pupil luminance distribution used in the exposure of the exposed pattern.
32. The method according to claim 31, wherein the fifth step comprises again executing the third step, the fourth step, and the fifth step after adjusting the illumination pupil luminance distribution, based on the exposed pattern measured in the fourth step.
33. The method according to claim 31, wherein the fifth step comprises adjusting the illumination pupil luminance distribution without change thereof, based on the exposed pattern measured in the fourth step.
34. The method according to claim 31, wherein the fifth step comprises adjusting the illumination pupil luminance distribution, based on a shape error of the exposed pattern measured in the fourth step.
35. The method according to claim 31, comprising a seventh step in which a photosensitive material on the substrate is developed and the exposed pattern is obtained, between the third step and the fourth step.
36. The method according to claim 31, wherein the predetermined pattern includes an optical proximity correction pattern.
37. The method according to claim 31, wherein the optical element is a diffractive optical element.
38. An optical element manufactured according to the method as set forth in claim 31.
39. An exposure apparatus comprising an illumination optical system for illuminating a predetermined pattern with illumination light having passed via the optical element as set forth in claim 38, the exposure apparatus performing the exposure of the predetermined pattern on a photosensitive substrate.
effecting the exposure of the predetermined pattern on the photosensitive substrate, using the exposure apparatus as set forth in claim 39;
This application is based upon and claims the benefit of priorities from U.S. Provisional Application No. 60/960,085, filed on Sep. 14, 2007 and U.S. Provisional Application No. 61/071,949, filed on May 27, 2008, the entire contents of which are incorporated herein by reference.
In the present embodiment, the spatial light modulator 3 used herein is, for example, a spatial light modulator configured to continuously change orientations of mirror elements 3 a arrayed two-dimensionally. The spatial light modulator of this type applicable herein can be selected, for example, from those disclosed in Japanese Patent Application Laid-open (Translation of PCT Application) No. 10-503300 and European Patent Publication EP 779530A corresponding thereto, Japanese Patent Application Laid-open No. 2004-78136 and U.S. Pat. No. 6,900,915 corresponding thereto, Japanese Patent Application Laid-open (Translation of PCT Application) No. 2006-524349 and U.S. Pat. No. 7,095,546 corresponding thereto, and Japanese Patent Application Laid-open No. 2006-113437. European Patent Publication EP 779530A, U.S. Pat. No. 6,900,915 and U.S. Pat. No. 7,095,546 are incorporated as references herein. An embodiment of a manufacturing method of a diffractive optical element will be described below with reference to FIG. 3. FIG. 3 is a flowchart showing blocks of manufacturing an optical element (diffractive optical element). As shown in FIG. 3, a mask M having a pattern for exposures of mass-produced devices is set in the exposure apparatus (block S101). In other words, the mask M with the pattern for exposures of mass-produced devices is mounted on the mask stage MS in the exposure apparatus. This pattern of the mask M may have an OPC pattern (pattern for Optical Proximity Correction) and does not always have to be a pattern approximately similar to a light pattern formed on an exposure surface (image plane).
On the other hand, the afocal lens 7, zoom lens 10, and cylindrical micro fly's eye lens 11 constitute a distribution forming optical system which forms the predetermined light intensity distribution on the illumination pupil on the basis of the light having passed via the diffractive optical element 6. When the diffractive optical element 6 is used, the light intensity distribution or illumination pupil luminance distribution formed on the illumination pupil according to the diffraction pattern thereof is fixed. In contrast to it, when the spatial light modulator 3 is used, the illumination pupil luminance distribution can be freely and quickly changed according to the control signal from the control unit 4 to the mirror elements 3 a. Namely, the spatial light modulator 3 is similar to the diffractive optical element 6 in that it forms the predetermined light intensity distribution on the illumination pupil, but is different from the diffractive optical element 6 in that it variably forms the light intensity distribution on the illumination pupil.
In the above description, the spatial light modulator in which the orientations (inclinations) of the reflecting faces arrayed two-dimensionally can be individually controlled is used as the spatial light modulator with the plurality of optical elements arrayed two-dimensionally and controlled individually. However, without having to be limited to this, it is also possible, for example, to use a spatial light modulator in which heights (positions) of reflecting faces arrayed two-dimensionally can be individually controlled. The spatial light modulator of this type applicable herein can be, for example, one selected from those disclosed in Japanese Patent Application Laid-open No. 6-281869 and U.S. Pat. No. 5,312,513 corresponding thereto, and FIG. 1 d of Japanese Patent Application Laid-open (Translation of PCT Application) No. 2004-520618 and U.S. Pat. No. 6,885,493 corresponding thereto. These spatial light modulators are able to subject incident light to an action similar to that of a diffractive surface when a two-dimensional height distribution is formed therein. U.S. Pat. No. 5,312,513 and U.S. Pat. No. 6,885,493 are incorporated as references herein.
The aforementioned spatial light modulator with the plurality of reflecting faces arrayed two-dimensionally may be modified, for example, according to the disclosure in Japanese Patent Application Laid-open (Translation of PCT Application) No. 2006-513442 and U.S. Pat. No. 6,891,655 corresponding thereto, or according to the disclosure in Japanese Patent Application Laid-open (Translation of PCT Application) No. 2005-524112 and U.S. Pat. Published Application No. 2005/0095749 corresponding thereto. In the above description, the spatial light modulator used was the reflective spatial light modulator 3 with the plurality of mirror elements 3 a, but, without having to be limited to this, it is also possible to use, for example, a transmissive spatial light modulator disclosed in U.S. Pat. No. 5,229,872. U.S. Pat. No. 5,229,872, U.S. Pat. No. 6,891,655, and U.S. Pat. Published Application No. 2005/0095749 are incorporated as references herein.
FIG. 6A shows a modification example wherein the plane mirror PM is retractably provided in the entrance-side (exit-side) optical path of the mirror elements 3 a of the spatial light modulator 3 in the embodiment of FIG. 1; FIG. 6B shows a modification example wherein the plane mirror PM is retractably provided in the entrance-side (exit-side) optical path of the mirror elements 3 a of the spatial light modulator 3 in the modification example of FIG. 4; FIG. 6C shows a modification example wherein the plane mirror PM is retractably provided in the entrance-side (exit-side) optical path of the mirror elements 3 a of the spatial light modulator 3 in the modification example of FIG. 5.
In the above-described embodiment and modification examples, the optical system may be modified so that in the formation of the illumination pupil luminance distribution using the spatial light modulator 3, the illumination pupil luminance distribution is measured with a pupil luminance distribution measuring device and the spatial light modulator 3 is controlled according to the result of the measurement. Such technology is disclosed, for example, in Japanese Patent Application Laid-open No. 2006-54328 and in Japanese Patent Application Laid-open No. 2003-22967 and U.S. Pat. Published Application No. 2003/0038225 corresponding thereto. U.S. Pat. Published Application No. 2003/0038225 is incorporated as references herein. It is also possible to use, for example, the pupil luminance distribution measuring device disclosed in U.S. Pat. Published Application No. 2008/0030707. Teachings of U.S. Pat. Published Application No. 2008/0030707 are incorporated as reference herein. In the aforementioned embodiment, the mask can be replaced with a variable pattern forming device which forms a predetermined pattern on the basis of predetermined electronic data. Use of such a variable pattern forming device can minimize influence on synchronization accuracy even when the pattern surface is vertical. The variable pattern forming device applicable herein can be, for example, a DMD (Digital Micromirror Device) including a plurality of reflective elements driven based on predetermined electronic data. The exposure apparatus with the DMD is disclosed, for example, in Japanese Patent Application Laid-open No. 2004-304135 and International Publication WO 2006/080285. Besides the reflective spatial light modulators of the non-emission type like the DMD, it is also possible to use a transmissive spatial light modulator or a self-emission type image display device. It is noted that the variable pattern forming device can also be used in cases where the pattern surface is horizontal.
In the foregoing embodiment, it is also possible to apply the so-called polarized illumination method disclosed in U.S. Pat. Published Application Nos. 2006/0203214, 2006/0170901, and 2007/0146676. Teachings of the U.S. Pat. Published Application Nos. 2006/0203214, 2006/0170901, and 2007/0146676 are incorporated herein by reference.
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Clasificación de EE.UU. 355/67, 359/238, 359/290
Clasificación internacional G02F1/01, G02B26/00, G03F7/20
Clasificación cooperativa G03F7/70116, G03F7/70108, G03F7/70141, G03F7/70158, G02B27/0927, G02B26/02, G03F7/70058, G02B26/00
Clasificación europea G03F7/70D8F, G03F7/70D16B, G03F7/70D14, G03F7/70D8D
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