posted 28 Jul 2015, 05:12 by info admin
Jaime E. Santos 1, M. I. Vasilevskiy 2, N. M. R. Peres 2, G. Smirnov 2, Yu. V. Bludov 2
1- DTU Nanotech, Building 345B, Ørsteds Pl., 2800 Kongens Lyngby, Denmark 2- Centro de Fisica e Departamento de Fisica, Universidade do Minho, 4710-057 Braga, Portugal
We study the electromagnetic
properties of a metamaterial consisting of polarisable (nano)-particles and a single
graphene sheet placed at the interface between two dielectrics. We show that the
particle's polarisability is renormalised because of the electromagnetic
coupling to surface plasmons supported by graphene, which results in a
dispersive behavior, different for the polarisability components corresponding
to the induced dipole moment, parallel and perpendicular to the graphene sheet.
In particular, this effect is predicted to take place for a metallic particle
whose bare polarisability in the terahertz (THz) region is practically equal to
the cube of its radius (times 4πε0). This opens the possibility to
excite surface plasmons in graphene and enhance its absorption in the THz range
by simply using a monolayer of metallic particles randomly deposited on top of
it, as we show by explicit calculations [1]. [1] Jaime E. Santos, M. I.
Vasilevskiy, N. M. R. Peres, G. Smirnov, Yu. V. Bludov, Phys. Rev. B 90, 235420
(2014)
Jaime E. Santos received his degree
in Physics from the University of Porto, Portugal, in 1993 and his DPhil in
Theoretical Physics from the University of Oxford, in the UK, in 1997. Since
then, he has held positions at the TUM in Munich, at the Hahn Meitner Institute
in Berlin, and at the Universities of Porto and Minho in Portugal. Currently,
he is a Guest Scientist at the CNG, DTU Nanotech, holding a position as
Temporary Associate Professor (Lektor). His main interest is the Physics of
Graphene and related two-dimensional materials, in particular the transport
properties and the optical properties of such systems, but he has also
interests in Non-Equilibrium Thermodynamics of Quantum Systems and the Physics
of Solar Cells. |
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