{"title":"Chiral Quasi-Bound State in the Continuum in Dielectric Metasurface for Third Harmonic Generation with Strong Circular Dichroism","authors":"Wudeng Wang, Yingjie Ju, Zhaojun Han, Jiaheng Liu, Yujie Zhang","doi":"10.1007/s13538-025-01804-y","DOIUrl":null,"url":null,"abstract":"<div><p>In this work, we design and numerically investigate a chiral metasurface based on two-layer distorted silicon resonators on the silicon dioxide substrate. This distorted metasurface can support a chiral quasi-bound state in the continuum (quasi-BIC) with an ultrahigh Q-factor (exceeding 10<sup>5</sup>) and strong circular dichroism (CD = 0.887) by breaking the in-plane inversion symmetry. The sharply chiral quasi-BIC realized in this metasurface can generate high local field enhancement and be used in strong CD nonlinear responses. Numerical results show that the third-harmonic generation (THG) efficiency of 9.24 × 10<sup>−5</sup> for a peak amplitude of the pump of 1.55 × 10<sup>8</sup> V/m can be achieved, and the THG-CD reaches up to 0.94. Meanwhile, we have theoretically demonstrated that this metasurface shows potential for applications in chiral sensing with high sensitivities.</p></div>","PeriodicalId":499,"journal":{"name":"Brazilian Journal of Physics","volume":"55 4","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Brazilian Journal of Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s13538-025-01804-y","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
In this work, we design and numerically investigate a chiral metasurface based on two-layer distorted silicon resonators on the silicon dioxide substrate. This distorted metasurface can support a chiral quasi-bound state in the continuum (quasi-BIC) with an ultrahigh Q-factor (exceeding 105) and strong circular dichroism (CD = 0.887) by breaking the in-plane inversion symmetry. The sharply chiral quasi-BIC realized in this metasurface can generate high local field enhancement and be used in strong CD nonlinear responses. Numerical results show that the third-harmonic generation (THG) efficiency of 9.24 × 10−5 for a peak amplitude of the pump of 1.55 × 108 V/m can be achieved, and the THG-CD reaches up to 0.94. Meanwhile, we have theoretically demonstrated that this metasurface shows potential for applications in chiral sensing with high sensitivities.
期刊介绍：
The Brazilian Journal of Physics is a peer-reviewed international journal published by the Brazilian Physical Society (SBF). The journal publishes new and original research results from all areas of physics, obtained in Brazil and from anywhere else in the world. Contents include theoretical, practical and experimental papers as well as high-quality review papers. Submissions should follow the generally accepted structure for journal articles with basic elements: title, abstract, introduction, results, conclusions, and references.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
