Polarization properties of an amplitude nematic liquid crystal grating
Polarization properties of an amplitude nematic liquid crystal grating
复制标题
振幅向列液晶光栅的偏振特性
DOI：
10.1117/1.601876
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发表时间：
1998
影响因子：
1.3
通讯作者：
Susumu Sato
中科院分区：
文献类型：
--
作者：
Zhan He;T. Nose;Susumu Sato
利用振幅型栅极结构和平行于栅极方向的均匀初始对准，制备了向列型液晶(LC)栅极。通过测量不同偏振态入射光下衍射光的斯托克斯参数，研究了LC光栅的偏振特性。首次验证了衍射光的电变偏振调制以及衍射光的强度调制。此外，当入射光线偏振平行或垂直于光栅方向时，LC光栅表现出一些独特的光学性质，如对称的衍射光强度，但对应的正负衍射级的反对称偏振态。提出了一个偏振光栅模型来解释这种反常的偏振特性，认为这可能与栅电极结构引起的反对称液晶分子取向域有关。
A nematic liquid crystal (LC) grating is prepared using an amplitude-type grating electrode structure and a homogeneous initial alignment parallel to the grating electrode direction. The polarization properties of the LC grating are investigated by measuring Stokes parameters of diffracted light under differently polarized incident light. The electrically variable polarization modulations of diffracted light are verified for the first time, as well as the diffraction light intensity modulations. Moreover, the LC grating exhibits some unique optical properties, such as symmetric diffraction light intensities but antisymmetric polarization states in corresponding positive and negative diffraction orders when the incident light is linearly polarized parallel or perpendicular to the grating direction. A polarization grating model is proposed to clarify the unusual polarization properties, which suggests that it may be related to the antisymmetric LC molecular orientation domains induced by the grating electrode structure.