Polarization-independent holographic gratings based on azo-dye-doped polymer-dispersedliquid-crystal films

Andy Ying Guey Fuh, Che Chang Chen, Ko Ting Cheng, Cheng Kai Liu, Wei Ko Chen

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We demonstrate polarization-independent holographic gratings (PIHGs) based on azo-dye-doped polymer-dispersed liquid crystal films. The PIHGs are recorded by irradiation under an intensity-modulated interference field, generated by two linearly polarized green optical beams, and by simultaneously applying a suitable AC voltage to the sample. The photoexcited azo dyes are adsorbed onto the UV-cured polymer film with their long axes parallel to the normal of the substrate. When the applied voltage is switched off, the PIHGs are generated with periodic modulation of liquid-crystal structures with transparently homeotropic and randomly scattered alignments. Additionally, the generated PIHGs can be completely switched off by an applied voltage.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalApplied Optics
Volume49
Issue number2
DOIs
StatePublished - 10 Jan 2010

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