Asymmetric excitations of toroidal dipole resonance and magnetic dipole quasi-bound state in the continuum in hybrid graphene-dielectric metasurface

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-10-01 DOI:10.1117/1.JNP.16.046003

Zhiqiang Hao, Yun'e Gao, Cuiying Song

引用次数: 0

Abstract

Abstract. We study asymmetric excitations of toroidal dipole resonance and magnetic dipole quasi-bound state in the continuum (BIC) in hybrid graphene-dielectric metasurface consisting of a nanoring and a Y-shaped nanobar. Through reducing or increasing inner radius of nanoring, the quasi-BIC dominated by magnetic dipole moment can be excited and effectively modulated via adjusting the Fermi energy and layer numbers of the graphene. The proposed metasurface can not only produce a symmetric localized magnetic field distribution but also create two asymmetric localized magnetic field distributions in near-infrared wavelength, providing a new way of indirectly manipulating the localized magnetic field enhancement. Our results can be of practical interest for a variety of applications including optical modulator, filter, switches and light trapping.

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混合石墨烯介电超表面中连续介质中环形偶极共振和磁偶极准束缚态的非对称激发

摘要研究了由纳米环和y形纳米棒组成的石墨烯-介电混合超表面中环向偶极子共振和磁偶极子准束缚态的不对称激发。通过减小或增大纳米环的内半径，可以通过调节石墨烯的费米能和层数来激发和有效调制磁偶极矩主导的准bic。所提出的超表面不仅可以产生对称的局域磁场分布，还可以在近红外波长产生两个不对称的局域磁场分布，为间接操纵局域磁场增强提供了一种新的方法。我们的研究结果可用于各种应用，包括光调制器、滤波器、开关和光捕获。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.