Fano resonances from plasmon-exciton coupling in hetero-bilayer WSe2-WS2 on Au nanorod arrays

Jinlin Zhang1, Manpreet Boora1, Taylor Kaminski1, Chito Kendrick2, Yoke Khin Yap1, and Jae Yong Suh1*

1 – Department of Physics, Michigan Technological University, MI, 49931, USA

2 – Department of Electrical and Computer Engineering, Michigan Technological University, MI, 49931, USA

*Corresponding author: jsuh@mtu.edu

Plasmon-exciton coupling in hetero-bilayer of WSe2 and WS2 transferred onto Au nanorod arrays is studied. Dark-field scattering measurements reveal that the in-plain dipole moment of excitons in monolayer WS2 allows only the narrow spectral range of 30 nm for the resonant coupling between the localized particle plasmons from Au nanorods and the bright excitons from WS2. We demonstrate that the q-parameter that represents the asymmetry of Fano resonances from plasmon-exciton coupling can be controlled by the polarization states of incident light. Surface lattice resonances in between individual Au nanorods play a role to diminish the damping factor of plasmon-exciton coupling in the arrays

WSe2 and WS2 layer transfer process optimized and completed in Microfabrication Facility

WS2 and WSe2 monolayers for this publication were provided by The Pennsylvania State University Two-Dimensional Crystal Consortium–Materials Innovation Platform (2DCC-MIP) which is supported by NSF co-operative agreement DMR-1539916.

Zhang, Jinlin, Manpreet Boora, Taylor Kaminski, Chito Kendrick, Yoke Khin Yap, and Jae Yong Suh. “Fano resonances from plasmon-exciton coupling in hetero-bilayer WSe2-WS2 on Au nanorod arrays.” Photonics and Nanostructures-Fundamentals and Applications (2020): 100783.


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