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Proceedings Paper

Patterned alignment liquid-crystal diffractive spatial light modulators and devices
Author(s): Carvel E. Holton; Philip J. Bos; Michael B. Miller; William E. Glenn
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Paper Abstract

Recent advances in diffractive liquid crystal (LC) modulation structures for projection display service have generated diffractive spatial light modulator (SLM) devices capable of high performance in transmission and/or reflection. Patterning of the LC domain alignments has resulted in the generation of near perfect phase diffraction grating structures in the lC material, which can be controlled by a single electrode or by an array of segmented electrodes, such as an array of pixels. Consequently, diffractive artifacts from inter-electrode gaps can be eliminated and/or suppressed in a wider spectrum of applications with enhanced performance relative to previous structures. Transmissive diffractive LC modulators suitable for display or switch applications with modulation efficiencies in excess of 90 percent and contrast ratios of greater than 1500:1 in un-polarized light have been demonstrated. Operation of this type of modulator in reflection has also been verified and demonstrated. Comparison of patterned alignment, LC device performance with MEMS and other diffractive structures will be given. Extensions of these techniques to devices which include beam scanners and controllable diffractive optics will be proposed.

Paper Details

Date Published: 20 April 1998
PDF: 12 pages
Proc. SPIE 3292, Spatial Light Modulators, (20 April 1998); doi: 10.1117/12.305504
Show Author Affiliations
Carvel E. Holton, Virginia Polytechnic Institute and State Univ. (United States)
Philip J. Bos, Kent State Univ. (United States)
Michael B. Miller, F&S, Inc. (United States)
William E. Glenn, Florida Atlantic Univ. (United States)

Published in SPIE Proceedings Vol. 3292:
Spatial Light Modulators
Richard L. Sutherland, Editor(s)

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