Laser & Optoelectronics Progress, Volume. 60, Issue 18, 1811021(2023)

Toroidal Dipole in Hybrid Bound States in the Continuum

Longqing Cong†、* and Guizhen Xu1、†
Author Affiliations
  • Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong , China
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    Metasurfaces based on bound states in the continuum (BIC) are capable of manipulating light in both temporal and spatial dimensions. In the temporal dimension, BIC possesses an infinite photon lifetime and is widely used in the laser cavity, nonlinear optics, and sensing. In this study, we investigate the properties of band-folded resonances and quasi-BIC based on a hybrid BIC metasurface. The key role of a toroidal dipole in distinguishing the two-type resonances is investigated via multipolar analysis, and numerical simulations, and verified by terahertz experiments. Moreover, hybrid BIC metasurfaces with supercells of different band folding features are compared, further demonstrating the essential role of the toroidal dipole in determining quality factors of these resonances. A deep understanding of the scattering properties of multipolar in resonance plays an important role in obtaining high-quality factor resonant cavities, laying a theoretical foundation for promoting the application of metasurfaces in terahertz sensing, modulators, and nonlinear interactions.

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    Longqing Cong, Guizhen Xu. Toroidal Dipole in Hybrid Bound States in the Continuum[J]. Laser & Optoelectronics Progress, 2023, 60(18): 1811021

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    Paper Information

    Category: Imaging Systems

    Received: Jun. 1, 2023

    Accepted: Aug. 1, 2023

    Published Online: Sep. 20, 2023

    The Author Email: Cong Longqing (conglq@sustech.edu.cn)

    DOI:10.3788/LOP231429

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