Guiding-mode-assisted double-BICs in an all-dielectric metasurface

• DOI: 10.1364/oe.463340
• Publication Date: 2022-06-16T17:00:09Z
• Authors: Zixuan Liao; Qichang Ma; Longxiao Wang; Zhi Yang; Meiqi Li; Fu Deng; Weiyi Hong
• Keywords: Electromagnetically Induced Transparency; Fano resonance; Slow Light; Rigorous coupled-wave analysis; Fano plane

The electromagnetically induced transparency (EIT) effect realized in a metasurface is potential for slow light applications its extreme dispersion variation the window. Herein, we propose an all-dielectric to generate double resonance-trapped quasi bound states continuum (BICs) form of EIT or Fano resonance through selectively exciting guiding modes with grating. group delay effectively improved up 2113 ps attributing ultrahigh Q-factor carried by quasi-BIC. coupled harmonic oscillator model and full multipole decomposition are utilized analyze physical mechanism EIT-based In addition, BIC based on can simultaneously exist at different wavelengths. These findings provide new feasible platform devices near-infrared region.