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36.4: Invited Paper : Real‐Time Light Amplification by Photorefractive Ferroelectric Liquid Crystal Mixtures
Author(s) -
Sasaki Takeo
Publication year - 2015
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.10458
Subject(s) - photorefractive effect , ferroelectricity , photoconductivity , liquid crystal , materials science , crystal (programming language) , phase (matter) , optoelectronics , optics , organic chemistry , chemistry , dielectric , physics , computer science , programming language
The photorefractive effect in photoconductive ferroelectric liquid crystals that contain photoconductive chiral compounds was investigated. Ter‐thiophene compounds with chiral structures were chosen as the photoconductive chiral compounds, and they were mixed with an achiral smectic C liquid crystal. The mixtures exhibit the ferroelectric chiral smectic C phase. The photorefractivity of the mixtures was investigated by two‐beam coupling experiments. It was found that the ferroelectric liquid crystals containing the photoconductive chiral compound exhibit a large gain coefficient of over 1200 cm ‐1 and a fast response time of 1 ms. Real‐time dynamic amplification of an optical image signal of over 30 fps using the photorefractive ferroelectric liquid crystal was demonstrated.