Surface enhanced resonant Raman scattering in hybrid MoSe2@Au nanostructures

Date
2018
Authors
Abid, Inès
Chen, Weibing
Yuan, Jiangtan
Najmaei, Sina
Peñafiel, Emil C.
Péchou, Renaud
Large, Nicolas
Lou, Jun
Mlayah, Adnen
Journal Title
Journal ISSN
Volume Title
Publisher
Optica
Abstract

We report on the surface enhanced resonant Raman scattering (SERRS) in hybrid MoSe2@Au plasmonic-excitonic nanostructures, focusing on the situation where the localized surface plasmon resonance of Au nanodisks is finely tuned to the exciton absorption of monolayer MoSe2. Using a resonant excitation, we investigate the SERRS in MoSe2@Au and the resonant Raman scattering (RRS) in a MoSe2@SiO2 reference. Both optical responses are compared to the non-resonant Raman scattering signal, thus providing an estimate of the relative contributions from the localized surface plasmons and the confined excitons to the Raman scattering enhancement. We determine a SERRS/RRS enhancement factor exceeding one order of magnitude. Furthermore, using numerical simulations, we explore the optical near-field properties of the hybrid MoSe2@Au nanostructure and investigate the SERRS efficiency dependence on the nanodisk surface morphology and on the excitation wavelength. We demonstrate that a photothermal effect, due to the resonant plasmonic pumping of electron-hole pairs into the MoSe2 layer, and the surface roughness of the metallic nanostructures are the main limiting factors of the SERRS efficiency.

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Citation
Abid, I., Chen, W., Yuan, J., Najmaei, S., Peñafiel, E. C., Péchou, R., . . . Mlayah, A. (2018). Surface enhanced resonant Raman scattering in hybrid MoSe2@Au nanostructures. Optics Express, 26(22), 29411-29423. doi:10.1364/OE.26.029411
Department
Physics and Astronomy