Impact of Graphene on the Polarizability of a Neighbour Nanoparticle: A Dyadic Green’s Function Study

Abstract

Abstract:We discuss the renormalization of the polarizability of a nanoparticle in the presence of either: (1) a continuous graphene sheet; or (2) a plasmonic graphene grating, taking into account retardation effects. Our analysis demonstrates that the excitation of surface plasmon polaritons in graphene produces a large enhancement of the real and imaginary parts of the renormalized polarizability. We show that the imaginary part can be changed by a factor of up to 100 relative to its value in the absence of graphene. We also show that the resonance in the case of the grating is narrower than in the continuous sheet. In the case of the grating it is shown that the resonance can be tuned by changing the grating geometric parameters.

Mechanically reconfigurable architectured graphene for tunable plasmonic resonances

“…Finally, to investigate the light–matter interactions 38 , 39 of crumpled graphene flakes, we introduce a dipole emitter placed 40 nm above the center of a free-standing biaxially crumpled graphene flake. The orientation of the dipole moment for the emitter is parallel to the x crumpling direction (the inset of Fig.…”

Using graphene conductors to enhance the functionality of atom chips

“…[49,50] in combination with models describing the optical properties of graphene, hBN and gold (see Appendix B for details). In this work, we take the Fermi energy and electron relaxation rate of graphene to be E F = 0.1 eV and γ = 4 THz, respectively, corresponding to typical values found both theoretically [51][52][53][54] and in experiments [55].…”

“…The relevant Green's tensors for calculating the CP potential and the Johnson noise must be evaluated at r = r = r 0 , where r 0 = (x 0 , y 0 , z 0 ) is the position of the center of the magnetic trap. After straightforward manipulation of the polar coordinates, the equal-position scattering Green's tensor is, therefore, given by [54,78] G (1)…”

Exciton-Photon Interactions in Semiconductor Nanocrystals: Radiative Transitions, Non-Radiative Processes and Environment Effects

“…If the characteristic distances (such as that between the emitter and the interface) are small compared to the EM wavelength, one can treat the problem in the electrostatic approximation where one neglects both the retardation effects and the magnetic field associated with the electric field present in the media; then, the image dipole method can be used to take into account the effect of surface polarization induced by the dipole [196]. A more general approach consists in using the dyadic Green's function formalism [197]. If both dielectrics are dispersionless, the spontaneous decay and FRET are affected through the photonic density of states (DOS) renormalization due to the reflection of electromagnetic (EM) waves at the interface.…”

“…The 3 × 3 dyadic matrix G(r , r) is determined by the Fresnel coefficients, r (p) and r (s) , and its explicit expression can be found in [197].…”