Wang Yi-Han, Wang Jin, Chen Yu-da, Huang Zhi-Sen, Jia Wei, Zhou Chang-He
Appl Opt. 2025 Feb 20;64(6):1484-1489. doi: 10.1364/AO.546716.
In this paper, we propose a one-dimensional polarization beam splitting grating under normal incidence with excellent polarization characteristics and a high diffraction efficiency. The main structure is a double-groove slanted grating. We employed a rigorous coupled-wave analysis and simulated annealing algorithm for numerical calculations of the grating. The optimized grating structure can concentrate the energy of TE-polarized light at the -1 order and the energy of TM-polarized light at the 0th order under normal incidence. The analysis results indicate that at the incident wavelength of 1550 nm, the diffraction efficiency is 93.549% for TE polarization and 93.522% for TM polarization, with an extinction ratio greater than 14 dB. To the best of our knowledge, this is the first report of a one-dimensional polarization beam splitter grating with a transmissive double-groove slanted grating under normal incidence. This grating shows great potential for applications in polarization measurement, imaging, and grating encoders.
在本文中，我们提出了一种在正入射下具有优异偏振特性和高衍射效率的一维偏振分束光栅。其主要结构是双槽倾斜光栅。我们采用严格耦合波分析和模拟退火算法对该光栅进行数值计算。优化后的光栅结构在正入射时可将TE偏振光的能量集中在 -1级，将TM偏振光的能量集中在0级。分析结果表明，在1550 nm的入射波长下，TE偏振的衍射效率为93.549%，TM偏振的衍射效率为93.522%，消光比大于14 dB。据我们所知，这是首次报道在正入射下具有透射式双槽倾斜光栅的一维偏振分束器光栅。这种光栅在偏振测量、成像和光栅编码器等应用中显示出巨大潜力。
