Liu Biying, Cheng Huichao, Yue Wenjie, Zhang Xinrong, Yao Han, Zhang Baifu, Liu Ning, Lu Yunqing, Xu Ji
Appl Opt. 2025 Aug 1;64(22):6242-6248. doi: 10.1364/AO.561883.
A compact, high-performance TE-pass polarizer for the terahertz (THz) band is demonstrated, achieving an ultra-high polarization extinction ratio (PER) and low insertion loss (IL) through a graphene-integrated hybrid plasmonic waveguide (GHPW). By exploiting the transverse graphene--Si structure, the undesired TM mode is effectively suppressed while the TE mode is confined with minimal loss. The integration of a wedge-shaped mode converter further enhances TE-mode transmission efficiency. Through systematic optimization of key parameters, including the geometric dimensions of the GHPW and the lengths of the wedge-mode converter and polarization region, the polarizer achieves outstanding performance. At 3 THz, the polarizer achieves a PER of up to 40.33 dB and an ultra-low IL of 0.17 dB. This work provides a high-performance solution for THz polarizers, with significant potential for the development and applications of THz technology.
展示了一种用于太赫兹（THz）频段的紧凑型高性能TE模偏振器，通过集成石墨烯的混合等离子体波导（GHPW）实现了超高偏振消光比（PER）和低插入损耗（IL）。通过利用横向石墨烯-硅结构，有效抑制了不需要的TM模，同时以最小损耗限制了TE模。楔形模式转换器的集成进一步提高了TE模传输效率。通过对包括GHPW的几何尺寸、楔形模式转换器和偏振区域长度在内的关键参数进行系统优化，该偏振器实现了出色的性能。在3太赫兹时，该偏振器实现了高达40.33分贝的PER和0.17分贝的超低IL。这项工作为太赫兹偏振器提供了一种高性能解决方案，在太赫兹技术的发展和应用方面具有巨大潜力。
