Holographic polymer dispersed liquid crystal system utilizing the co-polymerizations with siloxane compounds and polypropylene glycol derivatives

Tomoe Takanokura; Makio Kurashige; Kazutoshi Ishida; Yasuyuki Ohyagi; Masachika Watanabe; Yeong Hee Cho

doi:10.1117/12.873681

2 February 2011 Holographic polymer dispersed liquid crystal system utilizing the co-polymerizations with siloxane compounds and polypropylene glycol derivatives

Tomoe Takanokura, Makio Kurashige, Kazutoshi Ishida, Yasuyuki Ohyagi, Masachika Watanabe, Yeong Hee Cho

Author Affiliations +

Proceedings Volume 7955, Emerging Liquid Crystal Technologies VI; 79550W (2011) https://doi.org/10.1117/12.873681
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

Holographic polymer dispersed liquid crystal (HPDLC) has a feature that can control diffraction of light by applying electric field. HPDLC can be used for optical elements such as an optical switch, or a polarized beam splitter etc. One of the reactive systems for making HPDLC is well known photopolymerization-induced phase separation (PIPS). The performance of HPDLC by PIPS is dependent on distribution of oriented liquid crystal (LC) molecules, or size and shape of LC droplets. These are controlled by chemical structure or functional group of polymer matrix. In this report, Organic-inorganic hybrid materials having sensitivity at 532 nm were synthesized. Polymer matrix was formed with co-polymerization of siloxane-containing materials and poly (propylene glycol) derivatives functionalized with methacrylate groups. Siloxane chain was introduced in polymer matrix to encourage phase separation of LC and stabilize grating structure. In addition, poly (propylene glycol) derivatives were designed to control polymerization rate and extent of phase separation of LC. The characterization of HPDLC was evaluated in terms of diffraction efficiency, contrast between diffraction and transparency modes by applying voltage, and switch speed. As a result, the separation ratio of p-polarized light and s-polarized light was 100:1. The value of ▵n was 0.075, and the index matching of both polymer-rich layer and LC-rich layer was completed at voltage of 17V/μm.

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Tomoe Takanokura, Makio Kurashige, Kazutoshi Ishida, Yasuyuki Ohyagi, Masachika Watanabe, and Yeong Hee Cho "Holographic polymer dispersed liquid crystal system utilizing the co-polymerizations with siloxane compounds and polypropylene glycol derivatives", Proc. SPIE 7955, Emerging Liquid Crystal Technologies VI, 79550W (2 February 2011); https://doi.org/10.1117/12.873681

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