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

doi:10.1117/12.762550

29 January 2008 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

Proceedings Volume 6911, Emerging Liquid Crystal Technologies III; 69110I (2008) https://doi.org/10.1117/12.762550
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

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.

Citation Download Citation

Liang-Chen Lin, Ko-Ting Cheng, Cheng-Kai Liu, Chi-Lun Ting, Hung-Chang Jau, Tsung-Hsien Lin, and Andy Y.-G. Fuh "Fresnel lenses based on dye-doped liquid crystals", Proc. SPIE 6911, Emerging Liquid Crystal Technologies III, 69110I (29 January 2008); https://doi.org/10.1117/12.762550

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