Robust generation of intrinsic C points with magneto-optical bound states in the continuum

IF 11.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2024-11-15 DOI:10.1126/sciadv.ads0157

Wenjing Lv, Haoye Qin, Zengping Su, Chengzhi Zhang, Jiongpeng Huang, Yuzhi Shi, Bo Li, Patrice Genevet, Qinghua Song

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Abstract

C points, circular polarization in momentum space, play crucial roles in chiral wave manipulations. However, conventional approaches of achieving intrinsic C points using photonic crystals with broken symmetries suffer from a low Q factor and high sensitivity to structural geometry, rendering them fragile and susceptible to perturbations and disorders. We report magneto-optical (MO) bound states in the continuum (BICs) with a symmetry-preserved planar photonic crystal. We achieve intrinsic C points at Γ point that are robust against variation in both structural geometry and external magnetic field. MO coupling between two modes induces Zeeman splitting, leading to MO BICs and quasi-BICs with circular eigenstates for high-Q chiral responses. Furthermore, switchable C point handedness and circular dichroism are enabled by reversing the magnetic field. These findings unveil BICs and quasi-BICs with circular eigenstates and on-demand control of C points, paving the way for advanced chiral wave manipulation with enhanced light-matter interaction.

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利用连续体中的磁光束缚态稳健生成固有 C 点

C 点是动量空间中的圆偏振，在手性波操纵中发挥着至关重要的作用。然而，利用对称性被破坏的光子晶体实现本征 C 点的传统方法存在 Q 值系数低和对结构几何高度敏感的问题，这使得它们非常脆弱，容易受到扰动和紊乱的影响。我们利用对称性保留的平面光子晶体报告了连续体中的磁光（MO）束缚态（BICs）。我们在 Γ 点实现了本征 C 点，它对结构几何和外部磁场的变化都很稳定。两种模式之间的 MO 耦合会诱发泽曼分裂，从而产生 MO BIC 和准 BIC，并具有高 Q 手性响应的圆形特征态。此外，通过反转磁场还能实现可切换的 C 点手性和圆二色性。这些发现揭示了具有圆特征状态和按需控制 C 点的 BIC 和准 BIC，为增强光-物质相互作用的先进手性波操纵铺平了道路。

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

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.