Fresnel lenses based on dye-doped liquid crystals

Liang Chen Lin, Ko Ting Cheng, Cheng Kai Liu, Chi Lun Ting, Hung Chang Jau, Tsung Hsien Lin, Andy Y.G. Fuh

研究成果: 書貢獻/報告類型會議論文篇章同行評審

11 引文 斯高帕斯(Scopus)


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.

主出版物標題Emerging Liquid Crystal Technologies III
出版狀態已出版 - 2008
事件Emerging Liquid Crystal Technologies III - San Jose, CA, United States
持續時間: 20 1月 200822 1月 2008


名字Proceedings of SPIE - The International Society for Optical Engineering


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國家/地區United States
城市San Jose, CA


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