In this paper, we describe a novel liquid crystal-polymer composite material system which allows fast, single-step recording of volume holograms with diffraction efficiency approaching 100% and narrow angular selectivity. The diffraction efficiencies (DE) are controllable by applied electric fields. We have achieved complete switching of a first-order Bragg diffracted beam into the zero-order with an applied field of /spl sim/8 V//spl mu/m and 50-100 microsecond response time. Addition of a surfactant octanoic acid lowered the switching voltage to /spl sim/5 V//spl mu/m. We also recorded reflection gratings in this material system. We have 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.


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    Title :

    Electro-optical switching of volume holographic gratings recorded in polymer dispersed liquid crystals


    Contributors:


    Publication date :

    1996-01-01


    Size :

    772637 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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