Volume 126, Number 2, April 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||20 May 2019|
Excitation of SPPs in graphene by a waveguide mode
1 Faculdade de Física, Universidade Federal do Pará - 66075-110, Belém, Pará, Brazil
2 Departamento e Centro de Física, Universidade do Minho - 4710-057, Braga, Portugal
3 International Iberian Nanotechnology Laboratory (INL) - 4715-330, Braga, Portugal
Received: 8 April 2019
Accepted: 3 May 2019
We present a semi-analytical model that predicts the excitation of surface-plasmon polaritons (SPPs) on a graphene sheet located in front of a sub-wavelength slit drilled in a thick metal screen. We identify the signature of the SPP in the transmission, reflection, and absorption curves. Following the previous literature on noble-metal plasmonics, we characterize the efficiency of excitation of SPPs in graphene computing a spatial probability density. This quantity shows the presence of plasmonics resonances dispersing with the Fermi energy, EF, as an unambiguous signature of graphene plasmons.
PACS: 78.67.Wj – Optical properties of graphene / 81.05.ue – Graphene / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
© EPLA, 2019
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