WS2 Monolayer in Fabry–Perot Cavity Support for Plasmonic Fano Resonance

The Fano resonance is realized in a Fabry–Perot (FP) cavity with W S 2 sheet. The Fano resonance originates from the interaction between the FP cavity mode and the excition mode supported by the tungsten disulfide ( W S 2 ) sheet. The proposed system is modeled theoretically by coupled-mode theory (CMT) and numerically studied by finite difference-time domain method (FDTD). Results show that the Fano resonance coupling strength is up to 14.1 meV due to the large dipole transition moment of W S 2 , and the line-shapes can be tuned by the height of the FP cavity, the position of the W S 2 sheet, and the refractive index of the dielectric in the FP cavity, respectively. Moreover, the Fano resonance profile can be changed to a symmetrical Lorentz line-shape by tuning the orientation of the W S 2 sheet. The designed structure can find potential applications in enhanced light absorption in two-dimensional materials and sensing nano-devices in applied fields.