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

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 ap...

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Bibliographic Details
Published inApplied optics. Optical technology and biomedical optics Vol. 49; no. 2; p. 275
Main Authors Fuh, Andy Ying-Guey, Chen, Che-Chang, Cheng, Ko-Ting, Liu, Cheng-Kai, Chen, Wei-Ko
Format Journal Article
LanguageEnglish
Published United States 10.01.2010
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Summary: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.
ISSN:2155-3165
DOI:10.1364/AO.49.000275