High-Efficiency Dual-Band Excitations of Spoof Surface Plasmons on a Composite Metal Grating at Terahertz Frequencies

IF 5.6 4区物理与天体物理 Q2 CHEMISTRY, PHYSICAL

Plasmonics Pub Date : 2026-09-12 DOI:10.1007/s11468-026-03466-1

Yong-Qiang Liu, Xutao Zhang, Liangsheng Li, Wei Dai, Jinhai Sun

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引用次数: 0

Abstract

Spoof surface plasmons (SSPs) are special bounded surface waves on the corrugated metallic waveguides in Terahertz (THz) and/or microwave bands. SSPs modes have been proposed for various potential applications due to their advantages such as the tight near-field localization and enhanced light-matter interactions. However, previous studies on their high-efficiency excitations are only on a single type plasmonic waveguide and thus limited to single-band THz operation, which limit their applications for multi-band and multi-functional plasmonic devices and systems. To address this challenge, the dual-band excitations of THz SSPs on a composite metallic grating by integrating different rectangular groove depth are proposed and investigated. The composite metallic grating can simultaneously support dual-band tightly bounded SSPs modes, which the cutoff frequency of each mode is determined by the individual groove depth independently. The dual-band SSP waveguide is then designed in THz band and its propagation characteristics are also verified by both dispersion lines and good transmission performances of unit cell. Besides, high-efficiency near-field dual-band excitations based on wave vector matching mechanism via the charged electron beam are also investigated and analyzed via particle-in-cell simulations. The output field intensity, SSP power profiles and spectrum of dual-band SSPs at two distinct frequencies of around 0.76THz and 0.96THz are demonstrated. Compared to previous single-band excitations on single-periodic metallic grating, the ability to guide dual-band SSPs and the simultaneously high efficiency electronic excitations on composite meta-structures are promising to the development of novel dual-band multi-functional plasmonic devices and systems in THz photonics.

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太赫兹复合金属光栅表面欺骗等离子体激元的高效双带激发

欺骗表面等离子体（ssp）是在太赫兹（THz）和/或微波波段的波纹金属波导上的特殊有界表面波。ssp模式由于其紧密的近场定位和增强的光-物质相互作用等优点，被提出用于各种潜在的应用。然而，以往对其高效激发的研究仅针对单一类型的等离子体波导，因此仅限于单波段太赫兹工作，这限制了其在多波段多功能等离子体器件和系统中的应用。为了解决这一问题，提出并研究了通过积分不同矩形槽深度的太赫兹ssp对复合金属光栅的双频激励。该复合金属光栅可同时支持双频紧界ssp模式，各模式的截止频率由单个槽深独立决定。然后在太赫兹波段设计了双频SSP波导，并通过色散线和单元胞的良好传输性能验证了其传播特性。此外，还研究了基于波矢量匹配机制的带电电子束的高效近场双带激励。给出了双频SSP在0.76THz和0.96THz两个不同频率下的输出场强、功率分布和频谱。与以往在单周期金属光栅上的单波段激发相比，在复合元结构上引导双带ssp和同时进行高效率电子激发的能力有望在太赫兹光子学中发展新型双带多功能等离子体器件和系统。

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

Plasmonics 工程技术-材料科学：综合

CiteScore

5.90

自引率

6.70%

发文量

164

审稿时长

2.1 months

期刊介绍： Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons. Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.