一种通信波段强度比灵活可调的SPP分束器

doi:10.13190/j.jbupt.2021-266

北京邮电大学学报 ›› 2022, Vol. 45 ›› Issue (3): 69-73.doi: 10.13190/j.jbupt.2021-266

一种通信波段强度比灵活可调的SPP分束器

王海源, 李俊强, 于丽

北京邮电大学理学院, 北京 100876

收稿日期:2021-11-01 出版日期:2022-06-28 发布日期:2022-06-01
通讯作者: 于丽(1963—),女,教授,博士生导师,邮箱:yuliyuli@bupt.edu.cn。 E-mail:yuliyuli@bupt.edu.cn
作者简介:王海源(1996—),男,硕士生。
基金资助:
中央高校基本科研业务费专项资金项目(2019XD-A09)

A SPP Beam Splitter with Flexible and Adjustable Intensity Ratio in Communication Band

WANG Haiyuan, LI Junqiang, YU Li

School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2021-11-01 Online:2022-06-28 Published:2022-06-01

摘要/Abstract

摘要： 提出了一种基于金属纳米线结构的等离子体分束器。该分束器由3条直纳米线和1条环形纳米线组成,具有1个输入端和2个输出端。在输入端注入圆偏振光,所激发的表面等离子体激元(SPP)沿纳米线向前传播。采用时域有限差分法分析了分束器两端光强度的辐射比值,结果表明,2个输出端的光强度之比受输入端与输出端及2个输出端之间夹角的调控效果较为明显。可以改变输出端与输入端的夹角,或者2个输出端之间的夹角来调节2个输出端的光强度之比。通过对结构参数的优化,在通信波长1310nm和1550nm实现了分束比可宽范围调整的等离子体分束器。这些特性显示了在未来光子器件集成和传感设备中的潜在应用。

关键词: 表面等离子体激元, 分束器, 时域有限差分法, 纳米线

Abstract: A plasmonic beam splitter based on metal nanowire structure is proposed. The beam splitter consists of three straight nanowires and one annular nanowire, and has one input port and two output ports. By injecting circular polarized light at the input port, the excited surface plasmon polaritons (SPP) propagate forward along the nanowire. The radiance ratio of the light intensity at both ports of the beam splitter is analyzed by using the finite difference time domain method. The results show that the ratio of the light intensity of the two output ports is susceptible to the angle between the input and the output ports and between the two output ports. The light intensity ratio of two output ports can be adjusted by adjusting the angle between the output and the input port or the angle between the two output ports. By optimizing the structural parameters, a plasmon beam splitter that can adjust beam splitting ratio in a wide range is realized for the communication wavelengths of 1310nm and 1550nm. These properties show the potential of SPP beam splitter in photonic device integration and sensing equipment in future.

Key words: surface plasmon polaritons, beam splitter, finite-difference time-domain, nanowires

中图分类号:

TN256

王海源, 李俊强, 于丽. 一种通信波段强度比灵活可调的SPP分束器[J]. 北京邮电大学学报, 2022, 45(3): 69-73.

WANG Haiyuan, LI Junqiang, YU Li. A SPP Beam Splitter with Flexible and Adjustable Intensity Ratio in Communication Band[J]. Journal of Beijing University of Posts and Telecommunications, 2022, 45(3): 69-73.

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一种通信波段强度比灵活可调的SPP分束器

A SPP Beam Splitter with Flexible and Adjustable Intensity Ratio in Communication Band

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