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Optical Engineering

Optically enhancing the small electro-optical effect of a fast-switching liquid-crystal mixture
Author(s): Huan Xu; Anthony B. Davey; Tim D. Wilkinson; William A. Crossland
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Paper Abstract

The method of optical enhancement by means of intersurface-reflection-excited resonance was applied to a single-pixel device filled with a fast-switching electroclinic mixture M68. A contrast ratio of 6.5: 1, which is sufficient for a spatial light modulator (SLM), has been obtained for an electric-field-induced twist angle of 2.97 deg with an electro-optical response time of 162 ns. Success in a single-pixel device should allow very fast multipixel active-silicon-backplane SLMs to be made in the near future. Using this method, we have observed contrast ratios>5 with a field-induced twist angle>2.5 deg. However, better contrast can be achieved with improved alignment of the material used and device fabrication. The thickness effects of the light modulating layer on the resonant behavior were computer-modeled and are discussed in detail. It was found that considerable change occurs even for a thickness variation of 0.1 ?m. However, the effect is much less for a variation of 0.01 ?m. If SLM fabrication cannot control the thickness better than 0.1 ?m, either computer simulation for known thickness or preliminary measurements are needed.

Paper Details

Date Published: 1 June 2000
PDF: 5 pages
Opt. Eng. 39(6) doi: 10.1117/1.602530
Published in: Optical Engineering Volume 39, Issue 6
Show Author Affiliations
Huan Xu, Cambridge Univ. (United Kingdom)
Anthony B. Davey, Univ. of Cambridge (United Kingdom)
Tim D. Wilkinson, Univ. of Cambridge (United Kingdom)
William A. Crossland, Univ. of Cambridge (United Kingdom)

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