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) |