Observation of the bound states in the continuum supported by mode coupling in a terahertz metasurface

Metasurface supporting bound states in the continuum (BIC) provides a unique approach for the realization of intense near-field enhancement and high quality factor ( Q -factor) resonance, which promote the advancement of various applications. Here we experimentally demonstrate a Friedrich–Wintgen BI...

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Bibliographic Details
Published in:Optics letters 2023-09, Vol.48 (18), p.4809
Main Authors: Cui, Zijian, Wang, Yue, Sun, Guangcheng, Chen, Wenshuo, Zhang, Kuang, Wang, Xinmei
Format: Article
Language:English
Subjects:
Coupled modes
Coupling
Decay rate
Dipoles
Electric fields
Metasurfaces
Nonlinear optics
Q factors
Resonance
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Summary:Metasurface supporting bound states in the continuum (BIC) provides a unique approach for the realization of intense near-field enhancement and high quality factor ( Q -factor) resonance, which promote the advancement of various applications. Here we experimentally demonstrate a Friedrich–Wintgen BIC based on the mode coupling in the terahertz metasurface, which produces BIC by the coupling of the LC mode and dipole mode resonances. The transition from ideal BIC to quasi-BIC is caused by the mismatch of the coupling, and the mode decay rate during this process is analyzed by temporal coupled mode theory. The Q -factor and the electric field enhancement of the quasi-BIC resonance are significantly increased, which provides enormous potential in sensing, nonlinear optics, and topological optics.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.497757