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Numerical Modeling of Polarization Gratings by Rigorous Coupled Wave Analysis

机译:严格耦合波分析的偏振光栅数值模型

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We report on the numerical analysis of polarization gratings (PGs) and study their general diffraction properties by using the Rigorous Coupled Wave Analysis (RCWA) method. With this semi-analytical method, we can perform rigorous simulation without paraxial approximation and have a complete understanding of diffraction behavior of PGs, including those with complex twisted layers. We first adapt the formulation of conventional RCWA to simulate grating made by anisotropic material, as appropriate for the PG profile. We then validate our RCWA method by comparing its result with that given by finite-difference time-domain (FDTD) method. Diffraction characteristics including the spectral response, angular response, and polarization dependence are investigated. A comparison of the stability and computation performance between the two methods is also briefly discussed.
机译:我们报告了偏振光栅(PGs)的数值分析,并通过使用严格耦合波分析(RCWA)方法研究了它们的一般衍射特性。使用这种半分析方法,我们可以在不进行近轴近似的情况下执行严格的模拟,并且可以完全理解PG(包括具有复杂扭曲层的PG)的衍射行为。我们首先调整常规RCWA的公式,以模拟由各向异性材料制成的光栅,以适合PG轮廓。然后,通过将其结果与有限差分时域(FDTD)方法给出的结果进行比较,来验证RCWA方法。研究了包括光谱响应,角度响应和偏振相关性在内的衍射特性。还简要讨论了两种方法之间的稳定性和计算性能的比较。

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