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Issue 15, 2016
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Resonant surface plasmon–exciton interaction in hybrid MoSe2@Au nanostructures

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Abstract

In this work we investigate the interaction between plasmonic and excitonic resonances in hybrid MoSe2@Au nanostructures. The latter were fabricated by combining chemical vapor deposition of MoSe2 atomic layers, Au disk processing by nanosphere lithography and a soft lift-off/transfer technique. The samples were characterized by scanning electron and atomic force microscopy. Their optical properties were investigated experimentally using optical absorption, Raman scattering and photoluminescence spectroscopy. The work is focused on a resonant situation where the surface plasmon resonance is tuned to the excitonic transition. In that case, the near-field interaction between the surface plasmons and the confined excitons leads to interference between the plasmonic and excitonic resonances that manifests in the optical spectra as a transparency dip. The plasmonic–excitonic interaction regime is determined using quantitative analysis of the optical extinction spectra based on an analytical model supported by numerical simulations. We found that the plasmonic–excitonic resonances do interfere thus leading to a typical Fano lineshape of the optical extinction. The near-field nature of the plasmonic–excitonic interaction is pointed out experimentally from the dependence of the optical absorption on the number of monolayer stacks on the Au nanodisks. The results presented in this work contribute to the development of new concepts in the field of hybrid plasmonics.

Graphical abstract: Resonant surface plasmon–exciton interaction in hybrid MoSe2@Au nanostructures

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Publication details

The article was received on 29 Jan 2016, accepted on 07 Mar 2016 and first published on 15 Mar 2016


Article type: Paper
DOI: 10.1039/C6NR00829A
Citation: Nanoscale, 2016,8, 8151-8159

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    Resonant surface plasmon–exciton interaction in hybrid MoSe2@Au nanostructures

    I. Abid, A. Bohloul, S. Najmaei, C. Avendano, H.-L. Liu, R. Péchou, A. Mlayah and J. Lou, Nanoscale, 2016, 8, 8151
    DOI: 10.1039/C6NR00829A

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