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DESIGN CONSIDERATIONS OF FORM BIREFRINGENT MICROSTRUCTURES

机译:形式双折射微结构的设计考虑

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Diffraction characteristics of high-spatial-frequency (HSF) gratings are evaluated for application to polarization-selective computer-generated holograms by the use of two different approaches: second-order effective-medium theory (EMT) and rigorous coupled-wave analysis (RCWA). The reflectivities and the phase differences for TE- and TM-polarized waves are investigated in terms of various input parameters, and results obtained with second-order EMT and RCWA are compared. It is shown that although the reflection characteristics can be accurately modeled with the second-order EMT, the phase difference created by form birefringence for TE- and TM-polarized waves requires the use of a more rigorous, RCWA approach. The design of HSF gratings in terms of their form birefringence and reflectivity properties is discussed in conjunction with polarization-selective computer-generated holograms. A specific design optimization example furnishes a grating profile that provides a trade-off between the largest form birefringence and the lowest reflectivities. [References: 31]
机译:通过使用两种不同的方法:二阶有效介质理论(EMT)和严格的耦合波分析(RCWA),对高空间频率(HSF)光栅的衍射特性进行了评估,以应用于偏振选择计算机生成的全息图。 )。研究了TE和TM偏振波的反射率和相位差,并根据各种输入参数进行了比较,并比较了二阶EMT和RCWA获得的结果。结果表明,尽管可以使用二阶EMT精确地建模反射特性,但是由TE和TM偏振波的形式双折射产生的相位差仍需要使用更严格的RCWA方法。结合偏振选择性计算机生成的全息图,讨论了HSF光栅在形式双折射和反射率特性方面的设计。一个特定的设计优化示例提供了光栅轮廓,该轮廓在最大形式双折射和最低反射率之间进行了权衡。 [参考:31]

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