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Proceedings Paper

Phase-contrast lithography
Author(s): Soichi Inoue; Tadahito Fujisawa; Satoshi Tanaka; Shuichi Tamamushi; Yoji Ogawa; Makoto Nakase
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Paper Abstract

Phase contrast lithography using an annular-shaped phase only filter on the pupil plane of the projection optics was found to enlarge depth of focus for lines and spaces, isolated lines, spaces and hole patterns. The lines and spaces and isolated lines prefer an annular illumination. On the contrary, higher coherent illumination was effective for isolated spaces and hole patterns using the same phase modulation. It is not necessary to change the phase filter for each lithographic level. Phase contrast lithography gives us larger depth of focus in combination with halftone phase shifting mask. The phase filter does not have the problem of heating, and has high efficiency of exposure light. Several simulation results are presented, and the possibility of the phase contrast technology becoming a candidate for quarter micron lithography is discussed.

Paper Details

Date Published: 8 August 1993
PDF: 12 pages
Proc. SPIE 1927, Optical/Laser Microlithography, (8 August 1993); doi: 10.1117/12.150449
Show Author Affiliations
Soichi Inoue, Toshiba Corp. (Japan)
Tadahito Fujisawa, Toshiba Corp. (Japan)
Satoshi Tanaka, Toshiba Corp. (Japan)
Shuichi Tamamushi, Toshiba Corp. (Japan)
Yoji Ogawa, Toshiba Corp. (Japan)
Makoto Nakase, Toshiba Corp. (Japan)

Published in SPIE Proceedings Vol. 1927:
Optical/Laser Microlithography
John D. Cuthbert, Editor(s)

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