.png){kind=icon}
.png){kind=icon}
Return
Coexistence and interplay of Fabry-Perot and twin Friedrich-Wintgen bound states in the continuum in a plasmonic double T-cavity
.png){kind=icon}
PRE
AI
R
D
DOI：10.1063/5.0324716.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Bound states in the continuum (BICs) are typically investigated in terms of distinct formation mechanisms, such as symmetry-protected (SP), Friedrich-Wintgen (FW), or Fabry-Perot (FP) BICs. However, their coexistence and mutual interaction within a single plasmonic architecture have not been systematically examined so far. In this work, we show that these distinct BIC classes can coexist and interact in a metal-insulator-metal waveguide incorporating a double T-shaped cavity. Using an analytically tractable Green's function formalism supported by full-wave finite element simulations, we identify the simultaneous emergence of twin FW-BICs and FP-BICs. Unlike FW-BICs, which are independent of the separation between the two cavities, FP-BICs occur at a discrete set of cavity separations. We show that the interaction between the two types of BICs gives rise to multi-BICs, featuring highly confined, non-radiative modes. We further analyze how breaking the BIC condition leads to Fano-like and plasmon-induced reflection resonances as well as the Dicke effect. The combined analytical-numerical analysis provides physical insight into BIC formation in plasmonic waveguides and underscores the potential of these nanostructures for sensing and integrated optical filtering applications.
Keywords:
RESONANCES
DESIGN
Journal
IF:
2.5
Papers:
2.5K
Citations:
14.5W
Organization
Cited Papers