Cheng Huichao, Xu Ji, Chen Ziheng, Ting Pang, Yu Beibei, Liu Biying, Zhang Baifu, Lu Yunqing, Liu Ning
Appl Opt. 2025 Jun 20;64(18):5065-5071. doi: 10.1364/AO.562184.
Addressing the urgent demand for high-performance polarization control in silicon photonics, this work presents a compact TM-pass polarizer based on a synergistic vertical air slot and hollow hybrid plasmonic waveguide (HPW). The hollow HPW provides strong light-field localization, while the vertical air slot enables polarization-selective modulation. The hollow HPW enables strong TM mode localization, while the air slot selectively suppresses the TE mode through polarization-dependent cutoff. Optimized adiabatic mode transition minimizes TM propagation loss, while flexible polarization-region length adjustment enables broad-range selectivity for diverse applications. Compared to existing designs, it offers a 42% length reduction in its most compact form (5.8 µm), featuring a 214% bandwidth extension and 10% lower loss and with a polarization extinction ratio of 30.64 dB and an insertion loss of 0.4 dB at a 1.55 µm operating wavelength with a device length of 11.8 µm, integrating compactness with broad spectral performance.
为满足硅光子学中对高性能偏振控制的迫切需求，本文提出了一种基于协同垂直空气槽和中空混合等离子体波导（HPW）的紧凑型TM模偏振器。中空HPW可实现强光场局域化，而垂直空气槽则能实现偏振选择性调制。中空HPW可实现强TM模局域化，而空气槽通过偏振相关截止选择性地抑制TE模。优化的绝热模转换可使TM模传播损耗最小化，而灵活的偏振区域长度调整可为各种应用提供宽范围的选择性。与现有设计相比，其最紧凑形式（5.8 µm）的长度减少了42%，带宽扩展了214%，损耗降低了10%，在1.55 µm工作波长下，器件长度为11.8 µm时，偏振消光比为30.64 dB，插入损耗为0.4 dB，兼具紧凑性和宽光谱性能。
