Design and applications of a metasurface supporting chiral quasi-bound state in the continuum: Refractive index sensing and nonlinear harmonic generation

IF 2.5 3区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2025-05-23 DOI:10.1016/j.photonics.2025.101402

Zefa Sun, Yang Li, ShenWei Yin, Yu Mao, Yi Zhou, Zhixiang Tang

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引用次数: 0

Abstract

Metasurfaces empowered by quasi-BICs (q-BICs) have been widely employed to enhance chiral optical responses and enable sensing; however, studies that integrate both functionalities within a single design remain limited. In this work, we design a planar q-BIC chiral metasurface consisting of tilted TiO₂ bars with off-center inner holes, placed on a SiO₂ substrate and coated with polymethyl methacrylate (PMMA). Numerical simulations demonstrate that this design presents near-perfect circular dichroism (CD>0.99). Beyond exhibiting strong chirality, refractive index sensing with a sensitivity of 75.8 nm/RIU and a remarkable nonlinear CD approaching 1 are achieved with the same metasurface. These findings may provide a versatile platform for applications such as chiral laser generation, precision chiral sensing, and nonlinear optical filtering.

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连续介质中支持手性准束缚态的超表面设计与应用：折射率传感与非线性谐波产生

准bic （q- bic）增强的元表面被广泛应用于增强手性光学响应和实现传感；然而，在单一设计中集成这两种功能的研究仍然有限。在这项工作中，我们设计了一个平面q-BIC手性超表面，由带有偏心内孔的倾斜TiO2条组成，放置在SiO2衬底上，并涂有聚甲基丙烯酸甲酯（PMMA）。数值模拟表明，该设计具有近乎完美的圆二色性（CD>0.99）。除了表现出强手性外，在相同的超表面上实现了75.8 nm/RIU的折射率传感灵敏度和接近1的显著非线性CD。这些发现可能为手性激光产生、精密手性传感和非线性光学滤波等应用提供一个通用的平台。

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

Photonics and Nanostructures-Fundamentals and Applications 工程技术-材料科学：综合

CiteScore

5.00

自引率

3.70%

发文量

审稿时长

62 days

期刊介绍： This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.