基于萨格纳克干涉仪的偶氮染料掺杂液晶中光控和焦点可调菲涅耳透镜。

Optically controllable and focus-tunable Fresnel lens in azo-dye-doped liquid crystals using a Sagnac interferometer.

机构信息

Graduate Institute of Electro-Optical Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 811, Taiwan.

出版信息

Opt Lett. 2011 Apr 15;36(8):1311-3. doi: 10.1364/OL.36.001311.

DOI:10.1364/OL.36.001311

PMID:21499340

Abstract

This study demonstrates a tunable Fresnel lens in an azo-dye-doped liquid crystal (ADDLC) film using an interference technique. One Fresnel-patterned green beam using a Sagnac interferometer irradiated the UV-illuminated ADDLC cell, yielding a concentric zone plate distribution with homeotropic and isotropic structures in bright and dark regions of the green interference pattern. The proposed Fresnel lens is polarization independent, focus tunable, and the focusing efficiency of the device can be optically controlled.

摘要

本研究采用干涉技术在偶氮染料掺杂液晶（ADDLC）膜中展示了一种可调谐菲涅耳透镜。使用萨格纳克干涉仪产生的一束菲涅耳图案绿光辐照经紫外光照射的 ADDLC 单元，在绿光干涉图案的亮区和暗区产生同心的零级光分布，具有垂直和平行结构。所提出的菲涅耳透镜具有偏振无关性、可调焦和可光控的器件聚焦效率。