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Proceedings Paper

Fresnel lenses based on dye-doped liquid crystals
Author(s): Liang-Chen Lin; Ko-Ting Cheng; Cheng-Kai Liu; Chi-Lun Ting; Hung-Chang Jau; Tsung-Hsien Lin; Andy Y.-G. Fuh
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Paper Abstract

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.

Paper Details

Date Published: 29 January 2008
PDF: 12 pages
Proc. SPIE 6911, Emerging Liquid Crystal Technologies III, 69110I (29 January 2008); doi: 10.1117/12.762550
Show Author Affiliations
Liang-Chen Lin, National Cheng Kung Univ. (Taiwan)
Ko-Ting Cheng, National Cheng Kung Univ. (Taiwan)
Cheng-Kai Liu, National Cheng Kung Univ. (Taiwan)
Chi-Lun Ting, National Cheng Kung Univ. (Taiwan)
Hung-Chang Jau, National Cheng Kung Univ. (Taiwan)
Tsung-Hsien Lin, National Cheng Kung Univ. (Taiwan)
Andy Y.-G. Fuh, National Cheng Kung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6911:
Emerging Liquid Crystal Technologies III
Liang-Chy Chien, Editor(s)

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