What type of study is this?

This is a In Vitro Study study.

August 17, 2025

Quasi-bound states in the continuum with robust resonance wavelength in all-dielectric planar metasurface

Key Points

Quasi-bound states in the continuum were achieved with robust resonance wavelength, enhancing light-matter interaction.
Internal mechanisms reveal dual-band BIC modes originate from both magnetic dipole and toroidal dipole.
Design employed in-plane perturbation with geometry compensation and rotational symmetry for positive outcomes.
Applications as environmental sensors indicate strong potential for practical use in various fields.

Abstract

Abstract Bound states in the continuum (BIC) supported by metasurface broadens the possibilities for enhancing light-matter interaction. Yet the shift of resonance wavelength towards asymmetry perturbation and polarization states variation affects its practical application. In the present work, we design a metasurface to achieve quasi-BICs with both asymmetry and polarization independence through in-plane perturbation with geometry compensation and rotational symmetry. Through multipole decomposition, we reveal the internal physical mechanism that the dual-bands BIC modes are originated from magnetic dipole (MD) and toroidal dipole (TD), respectively. Furthermore, based on the designed metasurface, a promising application as an environmental sensor is discussed. The present work provides potential scenarios on the manipulation of BICs with higher robustness and better performance.

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