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

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

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number261103
JournalApplied Physics Letters
Volume90
Issue number26
DOIs
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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