Optically switchable biphotonic gratings based on dye-doped cholesteric liquid crystal films

H. C. Yeh, G. H. Chen, C. R. Lee, T. S. Mo

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28 引文 斯高帕斯(Scopus)

摘要

This study elucidates optically switchable gratings (BGs) based on biphotonic effect in dye-doped cholesteric liquid crystal films. When one circularly polarized green beam is switched on (off), the gratings can be turned on (off) by illumination with an interference field generated by two linearly polarized red beams. The biphotonic gratings are formed by two mechanisms-green-beam-induced dye reorientation through trans-cis isomerization and red-beam-induced suppression of dye reorientation by cis-trans back isomerization. These mechanisms result in a spatially periodic distribution with homeotropiclike and planarlike structures, respectively, in dark and bright regions of the interference field, generating the BGs.

原文English
文章編號261103
期刊Applied Physics Letters
90
發行號26
DOIs
出版狀態Published - 2007

All Science Journal Classification (ASJC) codes

  • 物理與天文學(雜項)

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