All-optical switchable holographic Fresnel lens based on azo-dye-doped polymer-dispersed liquid crystals |
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Authors: | Jashnsaz Hossein Nataj Nahid Hosain Mohajerani Ezeddin Khabbazi Amir |
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Affiliation: | Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran. |
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Abstract: | Fabrication of an all-optical switchable holographic liquid crystal (LC) Fresnel lens based on azo-dye-doped polymer-dispersed LCs is reported using a Michelson interferometer. It is found that, upon circularly polarized photoirradiation, the diffraction efficiency of the fabricated Fresnel lens was increased significantly in a reversible manner. We believe this is due to the anisotropy induced by reorientation of the LC molecules coupled with azo-dye molecule orientation due to trans-cis-trans photoisomerization, which modulates the refractive index of the LC-rich regions. We also studied the effect of azo dye on the polarization dependency of the fabricated lens. |
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