Realization of robust high-Q resonances of BICsvia eigenfield perturbations in a multiple-notched nanocube metasurface

• DOI: 10.1364/ol.539081
• Publication Date: 2024-10-08T21:03:26Z
• Authors: Lei Huang; Chuanqi Ding; Jiduo Ren; Siyi Sun; Weiqing Wang; Wen-Yong Lai
• Keywords: Realization (probability); Q factor; Fano resonance

Non-radiative bound states in the continuum (BICs) allow construction of resonances with high-quality (Q) factors and have emerged as an attractive platform for manipulating light–matter interactions on nanoscale. However, current studies symmetry-protected BICs (SP-BICs) suffer from a fundamental trade-off between Q factor asymmetric parameters, presenting significant hurdle practical applications. Here, utilizing eigenfield perturbations, we successfully break conventional inverse quadratic law SP-BICs realize robust high-Q against parameters. We find introductions central notch can efficiently boost resonance electric quadrupole, which results enhancement multiple-mode interference, thus improving factors, while constant effective refractive index guarantees stable wavelength. Our findings provide promising strategy modulating interaction may pave way applications future high-performance optoelectronic devices.