Spatial light modulators with integrated phase masks for holographic data storage

Michael J. O'Callaghan; John R. McNeil; Chris Walker; Mark A. Handschy

doi:10.1117/12.685167

22 June 2006 Spatial light modulators with integrated phase masks for holographic data storage

Michael J. O'Callaghan, John R. McNeil, Chris Walker, Mark A. Handschy

Proceedings Volume 6282, Optical Data Storage 2006; 628208 (2006) https://doi.org/10.1117/12.685167
Event: Optical Data Storage 2006, 2006, Montréal, Canada

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.

Citation Download Citation

Michael J. O'Callaghan, John R. McNeil, Chris Walker, and Mark A. Handschy "Spatial light modulators with integrated phase masks for holographic data storage", Proc. SPIE 6282, Optical Data Storage 2006, 628208 (22 June 2006); https://doi.org/10.1117/12.685167

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