Enhancing Excitation Efficiency of Spoof Surface Plasmons in Backward-Wave Regime

IF 2.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2025-06-26 DOI:10.1109/LPT.2025.3583489

Yong-Qiang Liu;Jinhai Sun;Wei Dai;Chao-Hai Du

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引用次数: 0

Abstract

Spoof surface plasmons (SSPs) on the periodic structures have aroused great attentions due to its extraordinary properties and novel applications. Up to now, the studies are limited to forward SSPs mode and the backward-wave SSPs (BWSSPs) have received little attentions in the community. In this letter, a new excitation method of BWSSPs on the uniform metal grating by using electron beam is proposed and validated by numerical simulations in Terahertz (THz) band. Due to its distinct dispersion characteristic in the first negative spatial harmonic wave region (

$n=-1$

), the propagation direction of generated BWSSPs is inverse to the electron beam. Besides, the matched momentum of BWSSPs which couples to free electron beam is larger than that of forward SSPs, thus leads to the required electron beam voltage significantly decreases. As a result, the excitation efficiency of BWSSPs by low-voltage electron beam is enhanced by double times compared to forward mode excitation according to the SSPs power spectrums. This work can provide a simple yet high-efficiency excitation method of SSPs mode working at backward regime. Moreover, it can open up new ways for the development of novel BWSSPs-based devices (e. g., sensors, couplers and radiation sources, etc.) in THz and/or microwave band.

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提高反向波态欺骗表面等离子体激振效率

周期结构上的欺骗表面等离子体（ssp）由于其特殊的性质和新颖的应用而引起了人们的广泛关注。到目前为止，研究仅限于正向ssp模式，而对后向波ssp （BWSSPs）的研究很少。本文提出了一种利用电子束在均匀金属光栅上激发BWSSPs的新方法，并通过太赫兹（THz）波段的数值模拟进行了验证。由于其在第一负空间谐波区（$n=-1$）具有明显的色散特性，产生的BWSSPs的传播方向与电子束相反。此外，与自由电子束耦合的BWSSPs的匹配动量大于正向sssps，从而导致所需的电子束电压显著降低。结果表明，低压电子束对BWSSPs的激发效率比正向激发效率提高了两倍。这项工作为ssp模式反向工作提供了一种简单而高效的激励方法。此外，它可以为在太赫兹和/或微波波段开发新型基于bwssps的设备（例如传感器，耦合器和辐射源等）开辟新的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.