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Proceedings Paper

Spatial light modulators with integrated phase masks for holographic data storage
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Paper Abstract

Phase masks are used to eliminate the Fourier-plane hotspot that otherwise degrades holographic data storage performance. In order to eliminate the cost, bulk, and precision alignment difficulties of inserting a discrete phase mask into an optical system we have designed phase masks integrated directly into the structure of a spatial light modulator used as the storage system's write head. A micron-thick ferroelectric liquid crystal film is confined between the surface of a VLSI integrated circuit and a window containing planarized relief structures on its inward-facing surface. This arrangement avoids depth-of-field problems encountered by designs that place the phase mask on the outer surface of the window. Any of a variety of phase mask designs can be implemented in this fashion. An alternative architecture in which pixel surfaces of the CMOS VLSI backplane are etched to differing heights is also investigated.

Paper Details

Date Published: 22 June 2006
PDF: 9 pages
Proc. SPIE 6282, Optical Data Storage 2006, 628208 (22 June 2006); doi: 10.1117/12.685167
Show Author Affiliations
Michael J. O'Callaghan, Displaytech, Inc. (United States)
John R. McNeil, Displaytech, Inc. (United States)
Chris Walker, Displaytech, Inc. (United States)
Mark A. Handschy, Displaytech, Inc. (United States)


Published in SPIE Proceedings Vol. 6282:
Optical Data Storage 2006
Ryuichi Katayama; Tuviah E. Schlesinger, Editor(s)

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