1 June 1992 Resolution enhancement of stepper by complementary conjugate spatial filter
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An ultra-high resolution stepper is proposed, which combines annular illumination and a complementary conjugate spatial filter. This technique reproduces deep submicron complex non-repeated patterns by relatively emphasizing the diffracted light from high spatial-frequency patterns. Images of several patterns are simulated for a conventional stepper, a stepper with phase shifting, and for the proposed technique. The results indicate that this technique has the potential to pattern 0.3-|im images using an i-line stepper with 0.5 N.A. with conventional masks. It should enable stepper ranges to be extended to the next generation of DRAMs.
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Minori N. Noguchi, Minori N. Noguchi, Yasuhiro Yoshitake, Yasuhiro Yoshitake, Yukio Kembo, Yukio Kembo, "Resolution enhancement of stepper by complementary conjugate spatial filter", Proc. SPIE 1674, Optical/Laser Microlithography V, (1 June 1992); doi: 10.1117/12.130370; https://doi.org/10.1117/12.130370

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