Source: https://patents.google.com/patent/US9195069
Timestamp: 2018-02-25 06:47:11
Document Index: 129174943

Matched Legal Cases: ['Application No. 2006', 'Application No. 60', 'art 3', 'art 4', 'art 3', 'art 4', 'Application No. 2008', 'Application No. 096111592', 'Application No. 096111592', 'Application No. 07739716']

US9195069B2 - Illumination optical apparatus, exposure apparatus, and device manufacturing method - Google Patents
US9195069B2
US9195069B2 US11783561 US78356107A US9195069B2 US 9195069 B2 US9195069 B2 US 9195069B2 US 11783561 US11783561 US 11783561 US 78356107 A US78356107 A US 78356107A US 9195069 B2 US9195069 B2 US 9195069B2
US20070258077A1 (en )
This application is based upon and claims the benefit of priorities from Japanese Patent Application No. 2006-112883 filed on Apr. 17, 2006, and U.S. Provisional Application No. 60/897,874 filed on Jan. 29, 2007, the entire contents of which are incorporated herein by reference.
FIG. 23 is a drawing schematically showing a configuration of a double-headed projection optical system consisting of refracting systems and folding mirrors.
The following will explain an illustrative case where beams of linearly polarized light having a circular cross section as indicated by a dashed line in FIG. 2 and having the polarization direction along the Z-direction are incident from the fly's eye lens 5 into the polarization varying member 6 by virtue of the actions of the polarization state varying part 3 and the beam shape varying part 4. In this case, the first light beams after converted into the X-directional linear polarization state having the polarization direction along the X-direction through the first optical rotation members 6 a and folded into the obliquely upward direction in FIG. 1 through the first folding members 7 a form a circular light intensity distribution as schematically shown in FIG. 4( a), at or near the pupil of the imaging optical system 10, and, therefore, at the position of the pupil of the relay optical system 13 or at the position of the illumination pupil near it. The beams forming this circular light intensity distribution are in the X-directional linear polarization state on the illumination pupil (corresponding to the X-directional linear polarization state on the first mask M1).
On the other hand, the second light beams after kept in the Z-directional linear polarization state having the polarization direction along the Z-direction through the second optical rotation members 6 b and folded into the obliquely downward direction in FIG. 1 through the second folding members 7 b form a circular light intensity distribution as schematically shown in FIG. 4( b), at the position of the pupil of the imaging optical system 10 or at the position of the illumination pupil near it. The beams forming this circular light intensity distribution are in the Z-directional linear polarization state on the illumination pupil (corresponding to the Y-directional linear polarization state on the second mask M2). Rectangular regions 20 a hatched in FIG. 4( a) are light regions corresponding to the beams having passed through the first optical rotation members 6 a and the first folding members 7 a, and rectangular regions 20 b hatched in FIG. 4( b) are light regions corresponding to the beams having passed through the second optical rotation members 6 b and the second folding members 7 b. In FIGS. 4( a) and (b), the two-headed arrows indicate the polarization directions of light, and the circle indicated by a dashed line corresponds to a cross section of the beams incident from the fly's eye lens 5 into the polarization varying member 6.
The first light beams forming the circular light intensity distribution on the pupil of the relay optical system 13 or on the illumination pupil near it form an illumination region IR1 of a rectangular shape elongated along the X-direction on the first mask M1, as shown in FIG. 5( a). The second light beams forming the circular light intensity distribution on the pupil of the imaging optical system 10 or on the illumination pupil near it form an illumination region IR2 of a rectangular shape elongated along the X-direction on the second mask M2, as shown in FIG. 5( b). As indicated by the two-headed arrows in FIGS. 5( a) and (b), the beams forming the first illumination region IR1 are in the X-directional linear polarization state, and the beams forming the second illumination region IR2 are in the Y-directional linear polarization state.
Namely, in a pattern region PA1 of the first mask M1, a pattern corresponding to the first illumination region IR1 is circularly illuminated by the light in the X-directional linear polarization state. In a pattern region PA2 of the second mask M2, a pattern corresponding to the second illumination region IR2 is circularly illuminated by the light in the Y-directional linear polarization state. In this manner, as shown in FIG. 5( c), a pattern image of the first mask M1 illuminated by the first illumination region IR1 is formed in a first region ER1 of a rectangular shape elongated along the X-direction in an effective imaging region ER of the projection optical system PL, and a pattern image of the second mask M2 illuminated by the second illumination region IR2 is formed in a second region ER2 having a rectangular contour shape elongated similarly along the X-direction in the effective imaging region ER, and located in parallel in the Y-direction to the first region ER1.
In the modification example shown in FIG. 7, the second folding members 7 b are intensively arranged in the central part of the beam splitting member 7 so as to correspond to the small circle indicated by the dashed line, and the first folding members 7 a are arranged so as to surround this group of second folding members 7 b. Therefore, in the case where the beams having the circular cross section are incident from the fly's eye lens 5 through the polarization varying member 6 into the beam splitting member 7, the first light beams folded into the obliquely upward direction in FIG. 1 through the first folding members 7 a form an annular light intensity distribution as schematically shown in FIG. 8( a), at the position of the pupil of the relay optical system 13 or at the position of the illumination pupil near it. On the other hand, the second light beams folded into the obliquely downward direction in FIG. 1 through the second folding members 7 b form a circular light intensity distribution as schematically shown in FIG. 8( b), at the position of the pupil of the imaging optical system 10 or at the position of the illumination pupil near it.
Rectangular regions 21 a hatched in FIG. 8( a) are light regions corresponding to the beams having passed through the first folding members 7 a, and rectangular regions 21 b hatched in FIG. 8( b) are light regions corresponding to the beams having passed through the second folding members 7 b. In FIGS. 8( a) and (b), the large circle indicated by a dashed line corresponds to the cross section of the beams incident from the fly's eye lens 5 into the beam splitting member 7. In the modification example shown in FIG. 7, as arranged in this manner, the first light beams forming the annular light intensity distribution on the pupil of the relay optical system 13 or on the illumination pupil near it annularly illuminate the first illumination region IR1 on the first mask M1. The second light beams forming the circular light intensity distribution on the pupil of the imaging optical system 10 or on the illumination pupil near it circularly illuminate the second illumination region IR2 on the second mask M2.
In the modification example shown in FIG. 7, as described above, it is feasible to implement various forms as to the polarization state of the light intensity distribution formed on the illumination pupil by the first light beams or by the second light beams, by changing the number of types of optical rotation members forming the polarization varying member 6, the optical rotation characteristics of the respective types of optical rotation members, the arrangement of the types of optical rotation members, the polarization state of the light incident to the polarization varying member 6, and so on. Specifically, as shown in FIG. 9( a), the polarization state of the annular light intensity distribution formed on the illumination pupil by the first light beams can be set, for example, in the circumferential polarization state. Furthermore, the polarization state of the circular light intensity distribution formed on the illumination pupil by the second light beams can be set, for example, in the Z-directional linear polarization state (or in the X-directional linear polarization state, in an unpolarized state, or the like), as shown in FIG. 9( b).
In the modification example of FIG. 10, the first light beams separated through the beam splitting member 7 form, for example, a circular light intensity distribution at the position of the pupil of the imaging optical system 10 or at the position of the illumination pupil near it, and then travel via the path-folding reflector 15 to form a rectangular illumination region IR1 elongated along the X-direction on the common mask M, as shown in FIG. 11( a). On the other hand, the second light beams separated through the beam splitting member 7 form, for example, a circular light intensity distribution at the position of the pupil of the imaging optical system 10 or at the position of the illumination pupil near it, and then travel via the path-folding reflector 15 to form a rectangular illumination region IR2 elongated along the X-direction on the common mask M, as shown in FIG. 11( b). Namely, in the modification example of FIG. 10, the first illumination region IR1 is formed so as to cover a portion of a first pattern region PA1 of the common mask M and the second illumination region IR2 is formed so as to cover a portion of a second pattern region PA2 next along the Y-direction to the first pattern region PA1.
In this manner, in the modification example of FIG. 10, as in the case of the embodiment of FIG. 1, the first pattern image illuminated by the first illumination region IR1 is also formed in the rectangular first region ER1 elongated along the X-direction in the effective imaging region ER of the projection optical system PL and the second pattern image illuminated by the second illumination region IR2 is formed in the second region ER2 having the rectangular contour shape elongated similarly along the X-direction in the effective imaging region ER, and located in parallel in the Y-direction to the first region ER1, as shown in FIG. 5( c). The modification example of FIG. 10 achieves the maximum common optical path for guiding the two types of beams immediately after the separation by the beam splitting member 7 and thus can implement the simpler configuration and more compact form than the embodiment of FIG. 1.
The first folding members 17 a indicated by fan-shaped hatching regions in FIG. 13 are configured to fold rays incident along the Y-direction into the obliquely upward direction in the drawing, as shown in FIG. 14( a). On the other hand, the second folding members 17 b indicated by fan-shaped outline regions in FIG. 13 are configured to fold rays incident along the Y-direction into the obliquely downward direction in the drawing, as shown in FIG. 14( b). The pair of first folding members 17 a and the pair of second folding members 17 b each are arranged so as to be opposed to each other with the optical axis AX in between.
Specifically, the first optical rotation members 16 a indicated by fan-shaped hatching regions in FIG. 13 are arranged corresponding to the first folding members 17 a as shown in FIG. 14( a), and the thickness thereof is so set that when linearly polarized light having the polarization direction along the Z-direction is incident thereto, they output linearly polarized light having the polarization direction along a direction resulting from +90° rotation of the Z-direction around the Y-axis, i.e., along the X-direction. On the other hand, the second optical rotation members 16 b indicated by fan-shaped outline regions in FIG. 13 are arranged corresponding to the second folding members 17 b as shown in FIG. 14( b), and the thickness thereof is so set that when linearly polarized light having the polarization direction along the Z-direction is incident thereto, they output linearly polarized light having the polarization direction along a direction resulting from +180° rotation of the Z-direction around the Y-axis, i.e., along the Z-direction. In other words, the first optical rotation members 16 a have a function of converting incident vertically polarized light into horizontally polarized light, and the second optical rotation members 16 b have a function of transmitting incident linearly polarized light without any change in its polarization state.
The following will explain an illustrative case in which quadrupolar light consisting of four beams of an elliptical cross section as indicated by dashed lines in FIG. 13 are incident in the Z-directional linear polarization state having the polarization direction along the Z-direction, to the polarization varying member 16, by virtue of the actions of the polarization state varying part 3 and the beam shape varying part 4. In this case, the first light beams after converted into the X-directional linear polarization state through the first optical rotation members 16 a and folded into the obliquely upward direction in FIG. 12 through the first folding members 17 a form a light intensity distribution of a Z-directionally dipolar shape consisting of two upper and lower beams 22 a of an elliptical cross section as shown in FIG. 15 (a), at the position of the exit surface of the beam splitting member 17, i.e., at the position of the illumination pupil.
On the other hand, the second light beams after maintained in the Z-directional linear polarization state through the second optical rotation members 16 b and folded into the obliquely downward direction in FIG. 12 through the second folding members 17 b form a light intensity distribution of an X-directionally dipolar shape consisting of two left and right beams 22 b of an elliptical cross section as shown in FIG. 15( b), at the position of the exit surface of the beam splitting member 17, i.e., at the position of the illumination pupil. In FIGS. 15( a) and (b), two-headed arrows indicate the polarization directions of light, and a circle and two line segments indicated by dashed lines correspond to the contours of the folding members 17 a and 17 b.
The first light beams forming the light intensity distribution of the Z-directionally dipolar shape on the pupil of the imaging optical system 10 or on the illumination pupil near it form the illumination region IR1 of the rectangular shape elongated along the X-direction on the first mask M1, as shown in FIG. 5( a). The second light beams forming the light intensity distribution of the X-directionally dipolar shape on the pupil of the imaging optical system 10 or on the illumination pupil near it form the illumination region IR2 of the rectangular shape elongated along the X-direction on the second mask M2, as shown in FIG. 5( b). Namely, in the pattern region PA1 of the first mask M1, a pattern corresponding to the first illumination region IR1 is dipolarly illuminated by the light in the X-directional linear polarization state. In the pattern region PA2 of the second mask M2, a pattern corresponding to the second illumination region IR2 is dipolarly illuminated by the light in the Y-directional linear polarization state.
In the modification example of FIG. 16, the first light beams after converted from the Z-directional linear polarization state into the X-directional linear polarization state through the first optical rotation members 16 a and folded into the obliquely upward direction in FIG. 12 through the first folding members 17 a form a light intensity distribution of a Z-directionally dipolar shape consisting of two upper and lower beams 22 a having an elliptical cross section as shown in FIG. 15( a), at the position of the exit surface of the beam splitting member 17′, i.e., at the position of the illumination pupil. On the other hand, the second light beams after having traveled straight through the optically transparent portions 17 c while being maintained in the Z-directional linear polarization state form a light intensity distribution of an X-directionally dipolar shape consisting of two left and right beams 22 b having an elliptical cross section as shown in FIG. 15( b), at the position of the exit surface of the beam splitting member 17′, i.e., at the position of the illumination pupil.
In the modification example of FIG. 16, as arranged in this manner, the first light beams forming the light intensity distribution of the Z-directionally dipolar shape on the pupil of the imaging optical system 10 or on the illumination pupil near it, also form the illumination region IR1 of the rectangular shape elongated along the X-direction on the first mask M1, as shown in FIG. 5( a), as in the second embodiment. Furthermore, the second light beams forming the light intensity distribution of the X-directionally dipolar shape on the pupil of the imaging optical system 10 or on the illumination pupil near it, also form the illumination region IR2 of the rectangular shape elongated along the X-direction on the second mask M2, as shown in FIG. 5( b).
In the modification example of FIG. 17, the first light beams separated through the beam splitting member 17 (17′) form, for example, a light intensity distribution of a dipolar shape at the position of the pupil of the imaging optical system 10 or at the position of the illumination pupil near it, and then travel via the path-folding reflector 18 to form the illumination region IR1 of the rectangular shape elongated along the X-direction on the common mask M, as shown in FIG. 11( a). On the other hand, the second light beams separated through the beam splitting member 17 (17′) form, for example, a light intensity distribution of a dipolar shape at the position of the pupil of the imaging optical system 10 or at the position of the illumination pupil near it, and then travel via the path-folding reflector 18 to form the illumination region IR2 of the rectangular shape elongated along the X-direction on the common mask M, as shown in FIG. 11( b). In this manner, the first illumination region IR1 is also formed so as to cover a portion of the first pattern region PA1 of the common mask M and the second illumination region IR2 is also formed so as to cover a portion of the second pattern region PA2 next along the Y-direction to the first pattern region PA1 in the modification example of FIG. 17 as in the modification example of FIG. 10.
The diffractive optical element 41, for example as shown in FIG. 19( a), has a first diffraction region 41A and a second diffraction region 41B. A light beam LB illuminating the first diffraction region 41A is diffracted by this first diffraction region 41A to form a light intensity distribution of a Z-directionally dipolar shape consisting of two upper and lower beams (LB1, LB2) having a fan-shaped cross section as shown in FIG. 19( b), at the position of the exit surface of the beam splitting member 17, i.e., at the position of the illumination pupil. At this time, the light intensity distribution of the Z-directionally dipolar shape is converted into X-directionally linearly polarized light by the first optical rotation members 16 a (cf. FIGS. 13 and 14) in the polarization varying member 16 as a polarization varying means, as shown in FIG. 19( b). Then a pattern corresponding to the first illumination region IR1 of the first mask M1 is dipolarly illuminated by the light in the X-directional linear polarization state (light having the fan-shaped cross section on the illumination pupil).
The light beam LB illuminating the second diffraction region 41B is diffracted by this second diffraction region 41B to form a light intensity distribution of an X-directionally dipolar shape consisting of two left and right beams (LB3, LB4) having a fan-shaped cross section as shown in FIG. 19( c), at the position of the exit surface of the beam splitting member 17, i.e., at the position of the illumination pupil. At this time, the light intensity distribution of the X-directionally dipolar shape is converted into Z-directionally linearly polarized light by the second optical rotation members 16 b (cf. FIGS. 13 and 14) in the polarization varying member 16 as a polarization varying means, as shown in FIG. 19 (c). Then a pattern corresponding to the second illumination region IR2 of the second mask M2 is dipolarly illuminated by the light in the Y-directional linear polarization state (light having the fan-shaped cross section on the illumination pupil).
Here the change in the respective illumination conditions in the first illumination region IR1 and in the second illumination region IR2 is achieved by replacement of the diffractive optical element 41 shown in FIG. 18, or by the power-varying optical system 42. First, the diffractive optical element 41 is replaced with another diffractive optical element 141 for implementing different illumination conditions for the respective illumination regions (IR1, IR2) by the replacing device such as a turret. The diffractive optical element 141, for example as shown in FIG. 20( a), has a first diffraction region 141A and a second diffraction region 141B. The light beam LB illuminating the first diffraction region 141A is diffracted by this first diffraction region 141A to form a light intensity distribution of a Z-directionally dipolar shape consisting of two upper and lower beams (LB11, LB12) having a circular cross section as shown in FIG. 20( b), at the position of the exit surface of the beam splitting member 17, i.e., at the position of the illumination pupil.
At this time, the light intensity distribution of the Z-directionally dipolar shape is converted into X-directionally linearly polarized light by the first optical rotation members 16 a (cf. FIGS. 13 and 14) in the polarization varying member 16, as shown in FIG. 20( b). Then a pattern corresponding to the first illumination region IR1 of the first mask M1 is dipolarly illuminated by the light in the X-directional linear polarization state (light having the circular cross section on the illumination pupil). In this case, since the sectional shape of light on the illumination pupil in the dipolar illumination is different from that in the case where the diffractive optical element 41 is disposed in the optical path, the pattern corresponding to the first illumination region IR1 of the first mask M1 is illuminated under a different illumination condition.
Furthermore, the light beam LB illuminating the second diffraction region 141B of the diffractive optical element 141 is diffracted by this second diffraction region 141B to form a light intensity distribution of an X-directionally dipolar shape consisting of two left and right beams (LB13, LB14) having a circular cross section as shown in FIG. 20( c), at the position of the exit surface of the beam splitting member 17, i.e., at the position of the illumination pupil. At this time, the light intensity distribution of the X-directionally dipolar shape is converted into Z-directionally linearly polarized light by the second optical rotation members 16 b (cf. FIGS. 13 and 14) in the polarization varying member 16, as shown in FIG. 20( c). Then a pattern corresponding to the second illumination region IR2 of the second mask M2 is dipolarly illuminated by the light in the Y-directional linear polarization state (light having the circular cross section on the illumination pupil). In this case, since the sectional shape of light on the illumination pupil in the dipolar illumination is different from that in the case where the diffractive optical element 41 is disposed in the optical path, the pattern corresponding to the second illumination region IR2 of the second mask M2 is illuminated under a different illumination condition.
Here the polarization varying member 43, as shown in FIG. 22 (a), has a first polarization varying region 43A corresponding to the first diffraction region 41A of the diffractive optical element 41, and a second polarization varying region 43B corresponding to the second diffraction region 41B of the diffractive optical element 41. The light beam LB illuminating the first polarization varying region 43A is converted into linearly polarized light in an X-directionally polarized state by polarizing action in this first polarization varying region 43A. Thereafter, this linearly polarized light is diffracted by the first diffraction region 41A to form a light intensity distribution of a Z-directionally dipolar shape consisting of two upper and lower beams (LB1, LB2) having a fan-shaped cross section as shown in FIG. 22( b), at the position of the exit surface of the beam splitting member 17, i.e., at the position of the illumination pupil. Then a pattern corresponding to the first illumination region IR1 of the first mask M1 is dipolarly illuminated by the light in the X-directional linear polarization state (light having the fan-shaped cross section on the illumination pupil).
Furthermore, the light beam LB illuminating the second polarization varying region 43B is converted into linearly polarized light in a Z-directionally polarized state by polarizing action in this second polarization varying region 43B. Thereafter, this linearly polarized light is diffracted by the second diffraction region 41B to form a light intensity distribution of an X-directionally dipolar shape consisting of two left and right beams (LB3, LB4) having a fan-shaped cross section as shown in FIG. 22( c), at the position of the exit surface of the beam splitting member 17, i.e., at the position of the illumination pupil. Then a pattern corresponding to the second illumination region IR2 of the second mask M2 is dipolarly illuminated by the light in the Y-directional linear polarization state (light having the fan-shaped cross section on the illumination pupil).
an optical integrator comprising a plurality of lens elements including at least a first lens element and a second lens element;
a beam splitting member comprising a first folding member and a second folding member, the first folding member being located at an illumination light path of the illumination optical apparatus and folding a light from the first lens element to emerge as a first light beam, the second folding member being located at a position different from that of the first folding member and folding a light from the second lens element to emerge as a second light beam, the beam splitting member being arranged for splitting an incident beam into the first light beam and the second light beam to form a first illumination region and a second illumination region;
a second light-guide optical system which is arranged in an optical path of the second light beam and which guides the second light beam to the second illumination region located apart from the first illumination region, the second light-guide optical system being different from the first light-guide optical system.
2. The illumination optical apparatus according to claim 1, comprising a polarization varying member which is arrangeable in an optical path of the illumination optical apparatus and which varies a polarization state of at least one of the first light beam and the second light beam.
3. The illumination optical apparatus according to claim 2, wherein the polarization varying member is located near the beam splitting member.
4. The illumination optical apparatus according to claim 2, wherein the optical integrator includes a plurality of wavefront splitting regions, each of the first lens element and the second lens element being a wavefront splitting region, and the beam splitting member includes a plurality of folding members located so as to correspond to respective wavefront splitting regions of the optical integrator.
5. The illumination optical apparatus according to claim 2, wherein the optical integrator includes a plurality of wavefront splitting regions, each of the first lens element and the second lens element being a wavefront splitting region, and the polarization varying member includes a plurality of optical rotation members located so as to correspond to respective wavefront splitting regions of the optical integrator.
6. The illumination optical apparatus according to claim 2, further comprising an imaging optical system located behind the optical integrator, and arranged for forming the first light beam on the first illumination region and for forming the second light beam on the second illumination region;
wherein the beam splitting member is located at a position of a pupil of the imaging optical system or at a position near the pupil of the imaging optical system.
7. The illumination optical apparatus according to claim 6, wherein the beam splitting member includes the first folding member which folds a first portion of the incident beam to convert the first portion of the incident beam into the first light beam traveling along a first direction, and a light transmitting portion for transmitting a second portion of the incident beam without folding the second portion of the incident beam.
8. The illumination optical apparatus according to claim 7, wherein the polarization varying member includes an optical rotation member provided corresponding to the folding member.
9. The illumination optical apparatus according to claim 6, wherein the beam splitting member includes the first folding member which folds a first portion of the incident beam to convert the first portion of the incident beam into the first light beam traveling along a first direction, and the second folding member which folds a second portion of the incident beam to convert the second portion of the incident beam into the second light beam traveling along a second direction.
10. The illumination optical apparatus according to claim 9, wherein the polarization varying member includes an optical rotation member provided corresponding to at least one of the first folding member and the second folding member.
11. The illumination optical apparatus according to claim 1, comprising a common optical system which guides light from a light source to the beam splitting member.
12. The illumination optical apparatus according to claim 11, wherein the common optical system includes a variator which includes an ability to vary a first illumination condition in the first illumination region and a second illumination condition in the second illumination region.
13. An exposure apparatus comprising the illumination optical apparatus as set forth in claim 1, the exposure apparatus being arranged to effect exposure of predetermined patterns illuminated by the illumination optical apparatus, on a photosensitive substrate.
14. The exposure apparatus according to claim 13, comprising a projection optical system for projecting a pattern image of a first mask illuminated by the first illumination region and a pattern image of a second mask illuminated by the second illumination region, onto the photosensitive substrate.
15. The exposure apparatus according to claim 14, wherein the pattern image of the first mask illuminated by the first illumination region is effected in a first shot area on the photosensitive substrate, and the pattern image of the second mask illuminated by the second illumination region is effected in a second shot area on the photosensitive substrate.
exposing the predetermined patterns on the photosensitive substrate using the exposure apparatus as set forth in claim 13;
developing the photosensitive substrate on which the predetermined pattern is transferred, and forming a mask layer in a shape corresponding to the predetermined pattern on a surface of the photosensitive substrate; and
17. The illumination optical apparatus according to claim 1, wherein the beam splitting member is located at a pupil position of the illumination optical apparatus.
18. The illumination optical apparatus according to claim 1, further comprising a common optical system including a condenser optical system, the beam splitting member being located in a position between the optical integrator and the condenser optical system.
19. The illumination optical apparatus according to claim 1, wherein the beam splitting member splits light beams divided by the optical integrator into the first light beam and the second light beam.
20. The illumination optical apparatus according to claim 1, wherein the optical integrator includes a plurality of wavefront splitting regions, each of the first lens element and the second lens element being a wavefront splitting region, and the beam splitting member is composed of a plurality of folding members arranged vertically and horizontally so that each folding member corresponds to respective wavefront splitting regions of the optical integrator.
21. The illumination optical apparatus according to claim 1, wherein in the beam spitting member, the first folding member is arranged in an optical path of the light from the first lens element and the second folding element is arranged in an optical path of the light from the second lens element.
22. An illumination optical apparatus comprising:
a beam splitting member comprising a first folding member and a second folding member, the first folding member being located at an illumination light path of the illumination optical apparatus and folding a light from the first lens element to emerge as a first light beam, the second folding member being located at a position different from that of the first folding member and folding a light from the second lens element to emerge as a second light beam, the beam splitting member being arranged in an optical path of an incident beam and which splits the incident beam into the first light beam and the second light beam to form a first illumination region and a second illumination region;
a second light-guide optical system which is arranged in an optical path of the second light beam and which guides the second light beam to the second illumination region located apart from the first illumination region, the second light-guide optical system being different from the first light-guide optical system, and
wherein the common optical system includes a variator which includes an ability to vary a first illumination condition in the first illumination region and a second illumination condition in the second illumination region; and
a polarization variator which variably sets the first light beam in a desired polarization state in the first illumination region and variably sets the second light beam in a desired polarization state in the second illumination region, and the polarization variator is located in an incident side optical path of the variator or in an optical path between the variator and the beam splitting member.
23. An exposure apparatus comprising the illumination optical apparatus as set forth in claim 22, the exposure apparatus being arranged to effect exposure of predetermined patterns illuminated by the illumination optical apparatus, on a photosensitive substrate.
24. The exposure apparatus according to claim 23, comprising a projection optical system for projecting a pattern image of a first mask illuminated by the first illumination region and a pattern image of a second mask illuminated by the second illumination region, onto the photosensitive substrate.
25. The exposure apparatus according to claim 24, wherein the pattern image of the first mask illuminated by the first illumination region is effected in a first shot area on the photosensitive substrate, and the pattern image of the second mask illuminated by the second illumination region is effected in a second shot area on the photosensitive substrate.
exposing the predetermined patterns on the photosensitive substrate using the exposure apparatus as set forth in claim 23;
27. The illumination optical apparatus according to claim 22, wherein in the beam spitting member, the first folding member is arranged in an optical path of the light from the first lens element and the second folding element is arranged in an optical path of the light from the second lens element.
28. An illumination optical apparatus comprising:
a setting member located in an incident side optical path of the beam splitting member and arranged for setting each of a first illumination condition in the first illumination region and a second illumination condition in the second illumination region
wherein the setting member includes a polarization setting member which variably sets the first light beam in a first polarized illumination state in the first illumination region and variably sets the second light beam in the second polarized illumination state in the second illumination region.
29. The illumination optical apparatus according to claim 28 wherein the setting member includes a varying member which includes an ability to vary each of the first illumination condition in the first illumination region and the second illumination condition in the second illumination region.
30. The illumination optical apparatus according to claim 28, wherein the setting member changes a light intensity distribution on an illumination pupil to change an illumination condition in the first illumination region and to change an illumination condition in the second illumination region.
31. The illumination optical apparatus according to claim 30, wherein the setting member includes a diffractive optical element which diffracts incident light to form a desired light intensity distribution on the illumination pupil, and a power-varying optical system which varies the light intensity distribution on the illumination pupil.
32. The illumination optical apparatus according to claim 28, wherein the setting member includes a polarizing member located on the light source side and in proximity of the beam splitting member.
33. The illumination optical apparatus according to claim 28, wherein the beam splitting member is located at or near an illumination pupil.
34. An exposure apparatus comprising the illumination optical apparatus as set forth in claim 28, the exposure apparatus being arranged to effect exposure of predetermined patterns illuminated by the illumination optical apparatus, on a photosensitive substrate.
35. The exposure apparatus according to claim 34, comprising a projection optical system for projecting a pattern image of a first mask illuminated by the first illumination region and a pattern image of a second mask illuminated by the second illumination region, onto the photosensitive substrate.
36. The exposure apparatus according to claim 35, wherein the pattern image of the first mask illuminated by the first illumination region is effected in a first shot area on the photosensitive substrate, and the pattern image of the second mask illuminated by the second illumination region is effected in a second shot area on the photosensitive substrate.
exposing the predetermined patterns on the photosensitive substrate using the exposure apparatus as set forth in claim 34;
38. The illumination optical apparatus according to claim 28, wherein in the beam spitting member, the first folding member is arranged in an optical path of the light from the first lens element and the second folding element is arranged in an optical path of the light from the second lens element.
an illumination optical system for distributing light from a light source on an illumination pupil plane to illuminate a plane to be illuminated with light from the illumination pupil plane; and
a projection optical system for forming a pattern image on a substrate arranged on the plane to be illuminated,
a beam splitting member having a first folding member which is arranged in an illumination light path of the illumination optical system and which folds a part of the light from the illumination pupil plane into a first direction and a second folding member which is arranged in the illumination light path of the illumination optical system and which folds a part of the light from the illumination pupil plane into a second direction; and
a light-guide optical system which is arranged in the illumination light path of the illumination optical system and which guides a first light beam folded into the first direction on a first illumination region on the plane to be illuminated and guides a second light beam folded into the second direction on a second illumination region on the plane to be illuminated and different from the first illumination region.
40. The exposure apparatus according to claim 39, wherein a first pupil distribution associated with the first light beam guided to the first illumination region is different from a second pupil distribution associated with the second light beam guided to the second illumination region.
41. The exposure apparatus according to claim 40, further comprising a fly's eye lens in which a plurality of optical surfaces are arranged in parallel,
wherein the first and second folding members are located near an exit surface of the fly's eye lens or a plane optically conjugated with the exit surface of the fly's eye lens.
42. The exposure apparatus according claim 39, wherein the first and second folding members are arranged near the illumination pupil or a position optically conjugated with the illumination pupil.
43. The exposure apparatus according to claim 42, wherein the first and second folding members are arranged at different positions in a plane near the illumination pupil plane or a plane optically conjugated with the illumination pupil.
44. The exposure apparatus according to claim 39, further comprising an optical system for distributing the light from the light source at different positions on the illumination pupil plane.
45. The exposure apparatus according to claim 44, wherein the first and second folding members are arranged at the different postions respectively.
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