铌酸锂
材料科学
光学
极化(电化学)
波导管
光电子学
消光比
分路器
横截面
横模
等离子体子
分束器
功率分配器和定向耦合器
制作
表面等离子体激元
表面等离子体子
物理
波长
激光器
病理
物理化学
化学
工程类
替代医学
医学
结构工程
作者
Jiakang Shi,Daohan Ge,Mengcheng Lv,Yujie Zhou,Guoxin Cui,Liqiang Zhang
出处
期刊:Journal of Nanophotonics
[SPIE - International Society for Optical Engineering]
日期:2023-05-04
卷期号:17 (02)
标识
DOI:10.1117/1.jnp.17.026005
摘要
A compact and broadband polarization beam splitter (PBS) is proposed based on an asymmetric directional coupler consisting of a hybrid plasmonic waveguide and a ridge waveguide on lithium-niobate-on-insulator. Due to the surface plasma polariton (SPP) effect, the phase-matching condition is satisfied for transverse electric polarization, whereas the transverse magnetic polarization has a significant phase mismatch by choosing reasonable widths of both waveguides. A short ( ∼ 28 μm long) PBS is designed while the gap width is chosen to be 200 nm to make it easy to fabricate. Numerical simulations show that the designed PBS has a broad bandwidth (>130 nm) for an extinction ratio of >15 dB and a large fabrication tolerance for the variation of the waveguide width (over ± 50 nm).
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