A polarization-selective bullet-alike reflective grating is described in this paper. Based on the finite element method, the parameters are continuously optimized to obtain the nice structure. During the simulation, within the incident wavelength of 1528–1563 nm or the incident angle range of 49.9–51.4°, the -2nd order of TE-polarized light achieves more than 95% efficient reflection, and the 0th and -2nd order of TM-polarized light achieves more than 40% efficient reflection for two ports. The results show the good process tolerance and incident characteristics of the grating. In addition, the normalized electric field distribution of bullet-alike reflective gratings is analyzed, which explains the complex physical mechanism well. The polarization-selective bullet-alike reflective grating can be well applied in the laser field.

中文翻译：

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在通信激光波长下第二布拉格入射下用于TE-one / TM-2分裂的类似子弹的阵列

本文描述了一种偏振选择类似子弹的反射光栅。基于有限元方法，对参数进行连续优化以获得良好的结构。在仿真过程中，在1528–1563 nm的入射波长或49.9–51.4°的入射角范围内，TE偏振光的-2阶可实现超过95％的有效反射，TM的0和-2阶偏振光可为两个端口实现40％以上的有效反射。结果表明光栅具有良好的加工公差和入射特性。此外，分析了子弹状反射光栅的归一化电场分布，很好地解释了复杂的物理机制。偏振选择类似子弹的反射光栅可以很好地应用于激光领域。