Azopolymer/Liquid Crystal Complex for Polarization Holograms

概要

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We have proposed and demonstrated a new holographic medium that can act as a write once read many (WORM) polarization-recordable medium. The new medium, composed of azobenzene-containing polymer and photocurable liquid crystal, exhibited birefringence when irradiated by polarized light. Additionally, the diffraction efficiency and the birefringence of this recorded complex increased to several times those of the simple rewritable azopolymer. This occurred because the orientation of photocurable liquid crystals was as good as that of the azopolymer because of the interaction with the mesogens. By measuring the birefringence, we confirmed that unlike the azopolymer, the orientation of the liquid crystal polymer was maintained even after circularly polarized beam irradiation. In this medium, only the photocurable liquid crystals were cured and became polymers with fixed orientation. Therefore, we propose that the new medium, which is polarization-recordable, WORM and highly sensitive, is very promising and practical for digital holographic storage.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-06-30