22 September 1995 Analysis of periodic polymer-dispersed liquid crystal structures for dynamic hologram applications
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Abstract
Electro-optical switching of the diffraction efficiency in volume holographic gratings offers the possibility of real-time control and programmability of diffractive optic components. We have recently demonstrated efficient electro-optical control of the diffraction efficiency in gratings consisting of periodic polymer-dispersed liquid crystal (PDLC) planes. We analyze this system as a rectangular index modulation profile, with the low index region being pure polymer, and the high index region consisting of a distribution of ellipsoidal nematic liquid crystal droplets of sub-micrometer size. The results of coupled-wave theory are combined with an analysis of the electro- mechanical behavior of these droplets to model the field-dependent diffraction efficiency. The effects of system parameters on diffraction switching is explored, and a physical interpretation of the switching phenomena in PDLC gratings is elucidated. Insights to the design of practical switchable diffractive optical elements can be obtained from the model.
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Richard L. Sutherland, Richard L. Sutherland, Lalgudi V. Natarajan, Lalgudi V. Natarajan, Vincent P. Tondiglia, Vincent P. Tondiglia, Timothy J. Bunning, Timothy J. Bunning, W. Wade Adams, W. Wade Adams, } "Analysis of periodic polymer-dispersed liquid crystal structures for dynamic hologram applications", Proc. SPIE 2532, Application and Theory of Periodic Structures, (22 September 1995); doi: 10.1117/12.221231; https://doi.org/10.1117/12.221231
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