Optically switchable biphotonic photorefractive effect in dye-doped liquid crystal films

Mei Ru Lee, Jyun Ruei Wang, Chia-Rong Lee, Andy Y.G. Fuh

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

This study reports the optically swichable photorefractive (PR) effect induced in a biphotonic grating in the presence of an applied dc voltage, in an azo-dye-doped liquid crystal (LC) film. When one green light is switched on (off), the PR grating can be turned on (off) by irradiating an interference field generated by two linearly polarized red lights. Experimental results demonstrate that such a PR effect follows primarily from a biphotonic process, with two mechanisms-the generation of green light-induced space charges by trans-cis isomerization, and the suppression of the formation of space charges by the red light in cis-trans back isomerization. These mechanisms apply to the dark and bright fringes of the red interference field, respectively. A spatially inhomogeneous space-charge field is then established to modulate the orientation of LCs, forming the PR grating in the presence of a dc voltage. Strong coupling of the two red lights is observable and measured dynamically during the formation of the PR grating in this study.

Original languageEnglish
Pages (from-to)5822-5824
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number24
DOIs
Publication statusPublished - 2004 Dec 13

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doped crystals
dyes
liquid crystals
gratings
space charge
isomerization
luminaires
interference
electric potential
retarding

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Lee, Mei Ru ; Wang, Jyun Ruei ; Lee, Chia-Rong ; Fuh, Andy Y.G. / Optically switchable biphotonic photorefractive effect in dye-doped liquid crystal films. In: Applied Physics Letters. 2004 ; Vol. 85, No. 24. pp. 5822-5824.
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Optically switchable biphotonic photorefractive effect in dye-doped liquid crystal films. / Lee, Mei Ru; Wang, Jyun Ruei; Lee, Chia-Rong; Fuh, Andy Y.G.

In: Applied Physics Letters, Vol. 85, No. 24, 13.12.2004, p. 5822-5824.

Research output: Contribution to journalArticle

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