High Q transparency, strong third harmonic generation, and giant nonlinear chirality driven by toroidal dipole-quasi-BIC

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-10-28 DOI:10.1063/5.0237217

Yang Cheng, Shijie Cai, Junjie Li, Hanyang Gong, Zhengqi Liu, Jing Chen, Guolan Fu, Xiaoshan Liu, Pingping Pan, Guiqiang Liu

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引用次数: 0

Abstract

Electromagnetically induced transparency (EIT), nonlinearity, and optical chirality hold significant applications in many areas such as optical switches, slow-light devices, chiral harmonic conversion, and optical storage. In this work, we theoretically propose an asymmetric all-dielectric metasurface supporting toroidal dipole-quasi-bound states in the continuum (TD-q-BICs). High quality (Q) EIT, strong third harmonic generation (THG), and giant nonlinear chirality are achieved via the extremely enhanced electric field energy localized in the Si plate by the TD-q-BIC. A huge transition from high Q EIT with transmission of ∼0.99 to strong chirality with circular dichroism (CD) of ∼0.9 is realized by tuning the angle and polarization state of incident light. Strong THG with efficiency of 4.5 × 10−3 under linear polarization light is due to the highly localized electric field supported by the TD-q-BIC and perfect nonlinear CD chirality with theoretically value of ∼1 originates from the large discrepancy in electric field distributions under different circularly polarized light. Our work provides an innovative paradigm to construct TD-q-BICs-governed EIT analogs, THG, and nonlinear chirality for the development of multifunction nanophotonic meta-devices.

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环状偶极子-准 BIC 驱动的高 Q 值透明度、强三次谐波生成和巨非线性手性

电磁诱导透明（EIT）、非线性和光学手性在光学开关、慢光器件、手性谐波转换和光存储等许多领域都有重要应用。在这项工作中，我们从理论上提出了一种非对称全介质元表面，它支持连续体中的环状偶极-准约束态（TD-q-BICs）。通过 TD-q-BIC 在硅板局部极度增强的电场能量，实现了高质量 (Q) EIT、强三次谐波发生 (THG) 和巨大的非线性手性。通过调整入射光的角度和偏振态，实现了从透射率为 ∼ 0.99 的高 Q 值 EIT 到圆二色性（CD）为 ∼ 0.9 的强手性的巨大转变。在线性偏振光下效率为 4.5 × 10-3 的强 THG 是由于 TD-q-BIC 支持的高度局域化电场，而理论值为 ∼ 1 的完美非线性 CD 手性则源于不同圆偏振光下电场分布的巨大差异。我们的工作为构建 TD-q-BIC 管控的 EIT 类似物、THG 和非线性手性提供了一个创新范例，有助于开发多功能纳米光子元器件。

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

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.