Bound states in the continuum resonance with high Q factor and strong robustness based on material asymmetric metasurfaces

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-04-09 DOI:10.1016/j.optcom.2025.131844

Xiaowei Jiang , Chunlian Zhan , Lin Yin

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引用次数: 0

Abstract

Currently, most quasi bound states in the continuum (QBIC) resonances are achieved by breaking the geometric symmetry of metasurfaces, which imposes a fundamental limit on the lowest achievable geometrical asymmetry and limits the tuning of QBIC resonances. Additionally, the Q factor of QBIC resonances rapidly decreases with the increase in geometric asymmetry and results in poor robustness. To address this issue, this work proposes a material asymmetric triple parallel nanorod metasurface (triple-PNM) that can excite high-Q and strong-robustness QBIC resonances. Moreover, QBIC resonance linewidth and Q factor can be tuned by adjusting two material asymmetry parameters of triple-PNM. The impact of fabrication errors on the resonance wavelengths and Q factor of the QBIC resonance was analyzed in detail. The QBIC resonance excited by the triple-PNM was applied to enhance the Goos–Hänchen (GH) shift, so GH shift can be tuned by adjusting the material asymmetry parameter and incident angle. In addition, sensors based on GH effect were found to have extremely high sensitivity.

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基于材料非对称超表面的高Q因子强鲁棒性连续共振束缚态

目前，大多数QBIC共振中的准束缚态都是通过打破超表面的几何对称性来实现的，这对可实现的最低几何不对称性施加了基本限制，并限制了QBIC共振的调谐。此外，QBIC共振的Q因子随着几何不对称性的增加而迅速降低，导致鲁棒性差。为了解决这个问题，本研究提出了一种材料不对称三平行纳米棒超表面（triple- pnm），可以激发高q和强鲁棒QBIC共振。此外，QBIC共振线宽和Q因子可以通过调节三重pnm的两个材料不对称参数来调节。详细分析了加工误差对QBIC谐振波长和Q因子的影响。利用三重pnm激发的QBIC共振增强Goos-Hänchen （GH）位移，通过调整材料不对称参数和入射角来调节GH位移。此外，发现基于GH效应的传感器具有极高的灵敏度。

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

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.