20 April 1995 Switchable holograms in new photopolymer-liquid-crystal composite materials
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Abstract
Switchable holograms open up the possibility of real-time electro-optical control of diffractive optic components. We have developed a novel photopolymer-liquid crystal material system which allows fast, single-step recording of holograms with diffraction efficiency controllable by conveniently applied electric fields. With the addition of a surfactant to our standard material recipe, we have achieved complete switching of a first-order Bragg diffracted beam into the zero-order with an applied field of approximately 5 V/micrometers and microsecond response time. We have also demonstrated image storage and electro-optical readout with these materials. Low voltage, high resolution scanning electron microscopy studies have confirmed that gratings formed in this material system consist of periodic polymer-dispersed liquid crystal planes. The critical fields for switching and the response times agree very well with a simple liquid crystal shaped-droplet model which we have applied to these gratings.
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Richard L. Sutherland, Lalgudi V. Natarajan, Vincent P. Tondiglia, Timothy J. Bunning, W. Wade Adams, "Switchable holograms in new photopolymer-liquid-crystal composite materials", Proc. SPIE 2404, Diffractive and Holographic Optics Technology II, (20 April 1995); doi: 10.1117/12.207464; https://doi.org/10.1117/12.207464
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