The incident angle dependences of the diffraction properties of orthogonal-circular polarization gratings (OCPGs) fabricated using a polymer liquid crystal exhibiting biaxial anisotropy have been investigated. The investigations were conducted with the plane orthogonal to the surface of the OCPGs as the plane of incidence. It was found that a specific biaxial anisotropy reduces the incident angle dependence of optically thin OCPGs against the wavelength of the incident light, and is less effective on thick OCPGs. In addition, a method also has been proposed to determine the biaxial anisotropic shape that most reduces the incident angle dependence in thin OCPGs.

中文翻译：

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光学双轴各向异性对工作在 Raman-Nath 至 Bragg 区域的正交圆偏振光栅的影响

已经研究了使用显示双轴各向异性的聚合物液晶制造的正交圆偏振光栅 (OCPG) 的衍射特性的入射角依赖性。以与 OCPG 表面正交的平面作为入射平面进行调查。发现特定的双轴各向异性降低了光学薄 OCPG 对入射光波长的入射角依赖性，并且对厚 OCPG 效果较差。此外，还提出了一种确定双轴各向异性形状的方法，该方法最能降低薄 OCPG 中的入射角依赖性。