ISSN:
1349-9432
Keywords:
photolithography
;
resolution
;
depth-of-focus
;
pupil filter
;
incoherence
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A new imaging method using an incoherent-type pupil filter: SFINCS (Spatial Filter for INCoherent Stream) is presented. The new filter divides the imaging beam into several incoherent beams at the pupil plane thereby enlarging the depth-of-focus (DOF). The capabilities of SFINCS are studied by simulations and several ways to realize the method are also discussed. The experimental results show that SFINCS has excellent DOF expanding capabilities for a point-image such as a hole pattern in VLSI lithography, and that 1.7 μm DOF is obtained with a 0.30 μm hole pattern by an i-line projection lens with 0.57 NA (numerical aperture).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s10043-995-0207-7
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