This paper designed a novel three-port reflective surface-covered grating with a connecting layer. The grating can be used as a splitter, and the polarized light can be divided into zero order, first order and second order. Through rigorous coupled-wave analysis, the efficiency of the three orders of diffraction light is close to 33% under the condition that the incident light at 1550 nm is incident at the second Bragg angle and the given duty cycle is 0.5. The efficiency and bandwidth of the surface-covered grating are improved compared with that of the surface-relief grating reported in the past. Especially for transverse magnetic polarized light, the beam splitting effect is more uniform, the efficiency ratio of the zeroth order to first order can reach 1.01, and the efficiency ratio of the first order to second order can reach 1.

中文翻译：

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表面覆盖的 1×3 光栅，带有第二次布拉格入射下的介电金属板

本文设计了一种新型的带有连接层的三端口反射面覆盖光栅。光栅可用作分光器，偏振光可分为零级、一级和二级。通过严格的耦合波分析，在1550 nm的入射光以第二布拉格角入射且给定占空比为0.5的条件下，三级衍射光的效率接近33%。与以往报道的表面浮雕光栅相比，表面覆盖光栅的效率和带宽都有所提高。尤其是横向磁偏振光，分束效果更均匀，零级与一级的效率比可达1.01，一级与二级的效率比可达1。