Carbazole-based Photorefractive Organic Glass Showing High Diffraction Efficiency at Low External Electric Field

概要

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Photorefractive organic glass, 9-(2-ethyl-hexyl)-3-[2-(4-nitro-phenyl)-vinyl]-9$H$-carbazole (EHCN), showing large coupling gain and high diffraction efficiency at low external electric field was synthesized and characterized. EHCN showed the glass transition at 25°C and the good thermal stability up to 400°C. Photorefractivity of EHCN was investigated by using 100 $\mu$m thick films (S1, S2, S3) doped with 0%, 0.5%, and 1% 2,4,7-trinitrofluorenone (TNF), respectively. Two-beam coupling net gain of 50.8 cm-1 was obtained for the 0.5% TNF-doped EHCN sample (S2) at 40 V/$\mu$m field. The highest internal diffraction efficiency, obtained from the degenerate four-wave mixing at 30 V/$\mu$m field, reached 90% for the 1% TNF-doped EHCN sample (S3).
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2001-05-15