Abstract
A bound state in the continuum (BIC) is a localized state in a continuous spectrum of radiating waves. In this study, the coupled-mode theory is introduced to more precisely interpret a symmetry-protected BIC and the quasi-BIC in a facile trimeric metasurface, compared with Fano formula, which is introduced to generate a high-quality factor resonance in a trimeric metallic slit metasurface. The multipole decomposition method and the near field distribution of the structure further illustrate that the underlying physics of the high-Q is mainly originated from the interference between the electric quadrupole mode and the magnetic toroidal mode. Physical mechanism shows that the resonance arises from the perturbation of symmetry-protected BICs. The result may play a role in the applications of lasers, optical sensors, and low-loss fibers.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
