PB相位光栅既具有对入射光偏振方向敏感的独特性质,同时又具有较宽的响应带宽和较高的单级衍射效率.采用基于偏振全息记录的液晶技术,将光敏偶氮染料 SD-1 旋涂在单面导电的 ITO 玻璃基板上,曝光后可得到具有偏振周期性旋转图案的取向层.结合 FDTD模拟仿真,设计了PB相位光栅制备方案并搭建了实验装置.设计 PB相位光栅衍射效率的检测光路,验证其高效的单级衍射.搭建圆偏振光旋向检测光路,验证了 PB相位光栅改变入射圆偏振光旋向的特性.
Preparation of Pancharatnam-Berry phase grating based on polarization holography
Pancharatnam-Berry(PB)phase grating not only has the unique property of being sen-sitive to the polarization direction of incident light,but also has a wide response bandwidth and a high single-stage diffraction efficiency.The liquid crystal technology based on polarization holographic re-cording was adopted,the photosensitive azo dye SD-1 was spin coated on a single conductive ITO glass substrate,the orientation layer with periodic rotation pattern of polarization could be obtained after exposure.Based on FDTD simulation,a preparation scheme for PB phase grating was designed and an experimental setup was built.The detection optical path of PB phase grating diffraction efficiency was designed to verify its efficient single-stage diffraction.It was verified by constructing a circularly po-larized light detecting path that the characteristic of PB phase grating have changed the rotation of in-cident circularly polarized light.
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