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Optically switchable and axially symmetric half-wave plate based on photoaligned liquid crystal films

机译：基于光取向液晶膜的可光切换且轴对称的半波片

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摘要

We demonstrate an optically switchable half-wave plate (HWP) composed of a photoaligned and axially symmetric liquid crystal (ASLC) film containing two azobenzene derivatives, methyl red (MR) and 4-butyl-4'-methoxyazobenzene (BMAB). MR is responsible for photoalignment, and BMAB is used for optical tuning and switching the state of polarization (SOP) of probe beam (633 nm He-Ne laser) passing through the MR/BMAB doped ASLC film. The photoaligned ASLC film is first fabricated using a line-shaped laser beam (532 nm) exposure applied on a rotating LC sample. The fabricated ASLC film can passively change the linearly polarized light. Under UV light exposure, the formation of cis-BMAB (bend-like shape) within the film disrupts the LC molecules, switches the LC orientation, and further changes the SOP of the probe beam. Under laser irradiation (532 nm), the formation of trans-BMAB (rod-like shape) reverts the LC orientation back and simultaneously generates cis-MR, helping anchor the LC in the previously photoaligned orientation. The photoaligned MR/BMAB-doped LC HWP can change the linear SOP under alternating UV and visible light exposure. (C) 2016 Elsevier B.V. All rights reserved.
机译：我们演示了一种光可切换的半波片（HWP），它由包含两个偶氮苯衍生物，甲基红（MR）和4-丁基-4'-甲氧基偶氮苯（BMAB）的光取向和轴对称液晶（ASLC）膜组成。 MR负责光对准，而BMAB用于光学调谐和切换穿过MR / BMAB掺杂的ASLC膜的探测光束（633 nm He-Ne激光）的偏振状态（SOP）。首先使用施加在旋转LC样品上的线形激光束（532 nm）曝光来制作光取向ASLC膜。所制造的ASLC膜可以被动地改变线性偏振光。在紫外光照射下，薄膜中顺式BMAB（弯曲形）的形成破坏了LC分子，改变了LC方向，并进一步改变了探测光束的SOP。在激光照射（532 nm）下，反式BMAB（棒状）的形成使LC方向变回原状，并同时产生顺式MR，有助于将LC锚定在先前的光取向。光取向MR / BMAB掺杂的LC HWP可以在紫外线和可见光交替照射下改变线性SOP。 （C）2016 Elsevier B.V.保留所有权利。

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