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 (...

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Bibliographic Details
Published in:Plasmonics (Norwell, Mass.) Mass.), 2023-08, Vol.18 (4), p.1371-1380
Main Authors: Chen, Fang, Li, Yuchang, Yang, Wenxing, Wang, Boyun, Xiao, Shuyuan
Format: Article
Language:English
Subjects:
Biochemistry
Biological and Medical Physics
Biophysics
Biotechnology
Chemistry
Chemistry and Materials Science
Coupled modes
Dipole moments
Electromagnetic absorption
Fabry-Perot interferometers
Fano resonance
Finite difference method
Nanotechnology
Nanotechnology devices
Refractivity
Time domain analysis
Tungsten disulfide
Two dimensional materials
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Summary: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.
ISSN:1557-1955
1557-1963
DOI:10.1007/s11468-023-01865-2