| Citation: | SUN Ao, WANG Rui-Peng, SUN Yu-Qi, WANG Xin-Yu, LI Wen-Hao, JIANG Yan-Xiu. Design and analysis of double-layer trapezoidal groove of polarization-independent beam-combination gratings with high diffraction efficiency[J]. Chinese Optics. doi: 10.37188/CO.2024-0083
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In order to meet the needs of broad band, high diffraction efficiency and polarization independent, a double-layer trapezoidal polarization independent beam grating is proposed in this paper. Firstly, based on the strict coupled wave theory, a design model of polarimetric independent combined beam grating based on particle swarm optimization algorithm is established, and the efficiency characteristics are optimized by randomly generating characteristic wavelengths. Then, the effects of slot depth, width ratio, side Angle and other structural parameters on the diffraction efficiency and bandwidth of single-layer and double-layer trapezoidal grating are analyzed in detail. Finally, the electric field enhancement characteristics of the two structures are analyzed and discussed. The results show that the double-layer trapezoidal polarimetric beam independent grating achieves a theoretical diffraction efficiency of more than 99% in the bandwidth range of 51 nm (
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