Terahertz wide-band band-stop plasmonic filter based on Dirac semimetal and stub resonators

IF 2.7 Q2 PHYSICS, CONDENSED MATTER

Micro and Nanostructures Pub Date : 2025-03-25 DOI:10.1016/j.micrna.2025.208156

Zhuang Li, Yan Pan, Fang Chen, Wenxing Yang

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引用次数: 0

Abstract

As a special three-dimensional material, bulk Dirac semimetal (BDS) has flexibility and tunability, allowing the bandwidth characteristics of band stop filters to be changed by altering the Fermi level and relaxation time. In this paper, a wideband band-stop filter based on BDS-insulator-BDS waveguide using BDS is proposed for the first time. The wideband plasmonic band-stop filter was numerically and theoretically studied using the FDTD method. In order to improve the performance of the proposed filter by widening the stopband frequency, we increased the number of stub resonators. In addition, by changing the geometric parameters of the stub resonator and the distance between the stubs, the filtering range and center frequency can be modified and shifted to a larger frequency. Its maximum bandwidth increases from 0.3934 THz to 0.5289 THz when more stub resonators are introduced. Therefore, the proposed plasmonic filter dynamically adjusts the filtering frequency and bandwidth by adjusting the Fermi level of BDS, providing a flexible and effective solution.

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基于狄拉克半金属和短谐振器的太赫兹宽带带阻等离子体滤波器

体狄拉克半金属（BDS）作为一种特殊的三维材料，具有灵活性和可调性，可以通过改变费米能级和弛豫时间来改变带阻滤波器的带宽特性。本文首次提出了一种基于BDS绝缘体-BDS波导的宽带带阻滤波器。采用时域有限差分法对宽带等离子体带阻滤波器进行了数值和理论研究。为了通过扩大阻带频率来提高所提出的滤波器的性能，我们增加了短段谐振器的数量。此外，通过改变短段谐振器的几何参数和短段之间的距离，可以修改滤波范围和中心频率，并将其移至更大的频率。当引入更多的短段谐振器时，其最大带宽从0.3934 THz增加到0.5289 THz。因此，本文提出的等离子体滤波器通过调整北斗系统的费米能级来动态调整滤波频率和带宽，提供了一种灵活有效的解决方案。

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

Micro and Nanostructures

CiteScore

6.50

自引率

0.00%

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