29 January 2008 Fresnel lenses based on dye-doped liquid crystals
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We demonstrated transmissive- and reflective-type Fresnel lenses based on dye-doped liquid crystal using photoalignment technique. The former is a polarization-independent and electrically tunable. The maximum diffraction efficiency reaches 37%, which approaches the theoretical limit ~ 41 %. Such a lens functions as a half-wave plate, and this feature could be well preserved under the applied voltage. The reflective-type Fresnel lens is based on dye-doped cholesteric liquid crystals (DDCLC). The formed lens persists without any external disturbance, and its focusing efficiency, analyzed using circularly polarized light, is ~ 23.7 %, which almost equals the measured diffraction efficiency of the used Fresnel-zone-plate mask (~ 25.6 %). The lens is thermally erasable, and rewritable. Notably, both of the transmissive- and reflective-type Fresnel lenses are switchable between focusing and defocusing states, upon application of a voltage. In addition, these devices are simple to fabricate, and have fast switching responses between focusing and defocusing state.
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Liang-Chen Lin, Liang-Chen Lin, Ko-Ting Cheng, Ko-Ting Cheng, Cheng-Kai Liu, Cheng-Kai Liu, Chi-Lun Ting, Chi-Lun Ting, Hung-Chang Jau, Hung-Chang Jau, Tsung-Hsien Lin, Tsung-Hsien Lin, Andy Y.-G. Fuh, Andy Y.-G. Fuh, } "Fresnel lenses based on dye-doped liquid crystals", Proc. SPIE 6911, Emerging Liquid Crystal Technologies III, 69110I (29 January 2008); doi: 10.1117/12.762550; https://doi.org/10.1117/12.762550

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