Honma Michinori, Takahashi Natsuki, Nose Toshiaki
Appl Opt. 2018 Dec 10;57(35):10183-10190. doi: 10.1364/AO.57.010183.
We propose a liquid crystal (LC) grating with a ternary orientation domain for application to optical polarization measurements. The ternary orientation domain, which generates two-dimensional diffraction properties, is the key to simultaneous acquisition of multiple of polarization parameters. The LC molecular orientation state and the polarization dependence of the diffraction efficiency were investigated experimentally, focusing on the applicability to a practical Stokes polarimeter. An experiment was conducted using the proposed LC grating as a Stokes polarimeter, and the four Stokes parameters (S, S, S, and S) were determined for linearly and circularly polarized incident light. As a result, the feasibility of the proposed LC grating Stokes polarimeter has been demonstrated experimentally. Finally, the operational performance of the proposed LC grating Stokes polarimeter is discussed using a figure of merit that is numerically derived from the measured polarization dependence of the diffracted light intensity.
我们提出了一种具有三元取向域的液晶（LC）光栅，用于光学偏振测量。产生二维衍射特性的三元取向域是同时获取多个偏振参数的关键。通过实验研究了LC分子取向状态和衍射效率的偏振依赖性，重点关注其在实际斯托克斯偏振计中的适用性。使用所提出的LC光栅作为斯托克斯偏振计进行了实验，并确定了线偏振和圆偏振入射光的四个斯托克斯参数（S₀、S₁、S₂和S₃）。结果，通过实验证明了所提出的LC光栅斯托克斯偏振计的可行性。最后，使用从测量的衍射光强度的偏振依赖性数值推导得到的品质因数，讨论了所提出的LC光栅斯托克斯偏振计的运行性能。
