In this paper, we describe a transmissive grating that eliminates the zeroth order, based on a T-ridged grating structure. The transmission efficiency of the zeroth order under transverse-electric polarization is 0.19%, and the diffraction efficiencies are 22.17% and 21.77% for the ±first and ±second orders, respectively. The transmission efficiency of the zeroth order under transverse-magnetic polarization is 0.11%, and the diffraction efficiencies are 24.12% and 21.93% for the ±first and ±second orders, respectively. In addition, a normalized electric-field diagram is obtained using a finite-element method and the physical mechanism inside the grating is comprehensively analyzed. The diffraction efficiency of each order is calculated for fluctuating values of the wavelength, period and duty cycle and optimized grating parameters. It is concluded that the grating has good tolerance and stability. The analytical results show that the T-ridged four-port grating has good developme...

中文翻译：

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T脊超材料消除了四端口功率分离的零阶

在本文中，我们描述了一种基于T脊光栅结构的消除零阶的透射光栅。零极化时零级的传输效率为0.19％，±一阶和±二阶的衍射效率分别为22.17％和21.77％。横轴极化时零级的传输效率为0.11％，±一阶和±二阶的衍射效率分别为24.12％和21.93％。此外，使用有限元方法获得了标准化的电场图，并对光栅内部的物理机制进行了综合分析。针对波长，周期和占空比的波动值以及优化的光栅参数，计算每个阶次的衍射效率。结论是该光栅具有良好的公差和稳定性。分析结果表明，T型脊四端口光栅具有良好的发展前景。