Abstract

Collective lattice resonances (CLRs) and bound states in the continuum (BICs) are two exciting approaches for achieving high quality factors in metasurfaces. BICs emerging from CLRs have raised great interest for not only the ultrahigh quality factors but also the nonlocal field enhancement. However, experimental demonstrations remain insufficient due to the material absorption or the inappropriate parameter design. Here we experimentally demonstrate dual-band symmetry-protected BICs emerging from Mie CLRs in all-dielectric metasurfaces. We attribute these dual-band BICs to the zero emission at $\Gamma$ point for the in-plane electric quadrupole and out-of-plane magnetic dipole CLRs, respectively. Such BICs feature nonlocal field enhancement and convenient spectral tunability, which are inherent to CLRs. We expect such nonlocal metasurfaces supporting BICs to find applications especially in nanolasers, nonlinear optics, and biochemical sensing.

© 2024 Optica Publishing Group

High-Q out-of-plane Mie electric dipole surface lattice resonances in silicon metasurfaces

Xueqian Zhao, Lei Xiong, Zhenrong Zhang, and Guangyuan Li
Opt. Express 30(19) 34601-34611 (2022)

Bound states in the continuum in asymmetric dual-patch metasurfaces

Ruey-Lin Chern, Hsueh-Chi Yang, and Jui-Chien Chang
Opt. Express 31(10) 16570-16581 (2023)

Multi-mode resonance of bound states in the continuum in dielectric metasurfaces

Lanfei Wang, Qiao Dong, Tianyi Zhou, Huijuan Zhao, Lianhui Wang, and Li Gao
Opt. Express 32(8) 14276-14288 (2024)

Toroidal dipole bound states in the continuum based on hybridization of surface lattice resonances

Deliang Chen, Juanjuan Xu, Hong Yu, and Zhangjie Mo
Opt. Express 31(12) 19828-19842 (2023)

Observation of maximal intrinsic chirality empowered by dual quasi-bound states in the continuum in a planar metasurface

Xin Qi, Jiaju Wu, Feng Wu, Song Zhao, Chao Wu, Yueyang Min, Mina Ren, Yufei Wang, Haitao Jiang, Yunhui Li, Zhiwei Guo, Yaping Yang, Wanhua Zheng, Hong Chen, and Yong Sun
Photon. Res. 12(2) 244-252 (2024)