基于BIC的全介质太赫兹手性可调超表面

杨悦; 姚不已; 戴海涛; 郝希晨; 王雨涵; 王若同; 郭廷扬; 杜文; 高铭; 谭琪; 李吉宁; 姚建铨

doi:10.37188/CO.EN-2025-0045

基于BIC的全介质太赫兹手性可调超表面

杨悦^1,,
姚不已^2, ,,
戴海涛^2, ,,
郝希晨²,
王雨涵²,
王若同²,
郭廷扬²,
杜文²,
高铭²,
谭琪³,
李吉宁³,
姚建铨^3, ,

1.
天津城建大学计算机与信息工程学院, 天津 300384, 中国
2.
天津大学理学院, 天津市低维材料物理与制备技术重点实验室, 天津 300072, 中国
3.
天津大学精密仪器与光电工程学院, 天津 300072, 中国

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出版历程
- 收稿日期: 2025-11-27
- 录用日期: 2026-01-29
- 网络出版日期: 2026-03-12

Tunable terahertz chiral response in all-dielectric BIC metasurfaces

doi: 10.37188/CO.EN-2025-0045

1.
School of Computer and Information Engineering, Tianjin Chengjian University, Tianjin 300384, China
2.
Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, School of Science, Tianjin University, Tianjin 300072, China
3.
School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin, 300072, China

Funds: Supported by the National Natural Science Foundation of China (No. 62201378, No.62375200, No.12274319)

More Information

Author Bio:
YANG Yue (1993—), female, born in Handan, Hebei Province, Ph.D., She received her Ph.D. from Tianjin University in 2021. Currently serves as Lecturer at Tianjin Chengjian University, She is mainly engaged in research of terahertz wave manipulation, and the design and realization of metasurfaces. E-mail: yangyue194@tju.edu.cn

YAO Bu-yi (2000—), male, born in Anqing, Anhui Province, Master's student at Tianjin University. His research focuses on the design and realization of metasurfaces. E-mail: yaobuyi@tju.edu.cn

Corresponding author: yaobuyi@tju.edu.cn; htdai@tju.edu.cn; jqyao@tju.edu.cn

摘要

摘要:
手性超表面在物理学、材料科学、药用植物学和通信领域发挥着关键作用。为实现高性能手性响应（如高圆二色性（CD）和高品质因数（Q因子）），基于BIC的超表面作为极具前景的平台已被广泛研究。然而，现有的BIC超表面大多依赖金属结构，其高电磁损耗与动态手性调节能力的缺失共同限制了实际应用价值。本文提出一种全介质手性BIC超表面。通过光照对称性破缺，该超表面展现出0.93的圆二色性值。此外，通过调节外部泵浦光能够实现圆二色性的动态调谐。该方案为动态操控手性超表面开辟了新途径，可用于实现更复杂的动态手性特性表征与应用。
- 全介质超表面 /
- 圆二色性 /
- 动态控制 /
- 太赫兹
Abstract:
Chiral metasurfaces play critical role in physics, materials science, pharmacognosy, and communications. To achieve high-performance chiral responses, such as high circular dichroism (CD) and high-quality factors (Q-factors), BIC-based metasurfaces have been extensively studied as a promising platform. However, most realized BIC metasurfaces rely on metallic constituents whose high electromagnetic losses and absence of dynamic chirality tuning together impose a severe limit on their practical potential. This paper presents an all-dielectric chiral BIC metasurface. By illumination symmetry breaking, the metasurface exhibits a CD value of 0.93. Additionally, dynamic tuning of CD is enabled by external optical pumping. This scheme provides a new avenue for dynamically manipulating the chiral metasurface, which can be used to achieve more complex dynamic chiral characterization and applications.
- all-dielectric metasurface /
- circular dichroism /
- dynamic control /
- terahertz

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Figure 1. (a) Schematic diagram of the all-dielectric metasurface. (b) The three-dimensional view and (c) top view of the unit structure.

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Figure 2. (a) Dispersion curves of the three modes in k-space. (b) The distribution of excited electric fields within the metasurface unit. (c) Q-factor profiles of the three modes. (d) Eigenpolarization maps.

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Figure 3. (a) The linearly polarized transmission spectra and (b) circularly polarized transmission spectra of the metasurface (incident angle $ \theta $= 0°). (c) The linearly polarized transmission spectra and (d) circularly polarized transmission spectra of the metasurface (incident angle $ \theta $= 4°).

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Figure 4. The electric and magnetic field excitations at the target frequency under two incident conditions (a) incident angle $ \theta $= 0°. (b) incident angle $ \theta $= 4°.(c) Transmission coefficients of the two circularly polarized light (CPL) under oblique incidence. (d) Circular dichroism of the metasurface under two incident angles.

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Figure 5. (a) Maximum values of CD at various incident angles. (b) CD spectra under different incident angles. (c) Dispersion and (d) Q-factor curves of metasurface units under pumping conditions.

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Figure 6. Transmission coefficients for (a) LCP and (b) RCP at various conductivities. (c) CD Spectra of the metasurface at different conductivities. (d)Peak CD values of the metasurface at various conductivities.

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