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 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.
Fuh
Andy Ying-Guey
AY
Department of Physics, National Cheng Kung University, Tainan 701, Taiwan.
Chen
Che-Chang
CC
Cheng
Ko-Ting
KT
Liu
Cheng-Kai
CK
Chen
Wei-Ko
WK