A volume integral equation solver for quantum-corrected transient analysis of scatterings from plasmonic nanostructures

Abstract

Quantum tunneling is observed between two nanostructures that are separated by a sub-nanometer gap. Electrons 'jumping' from one structure to another create an additional current path. An auxiliary tunnel is introduced between the two structures as a support for this so that a classical electromagnetic solver can account for the effects of quantum tunneling. The dispersive permittivity of the tunnel is represented by a Drude model, whose parameters are obtained from the electron tunneling probability. The transient scattering from the connected nanostructures (i.e., nanostructures plus auxiliary tunnel) is analyzed using a time domain volume integral equation solver. Numerical results demonstrating the effect of quantum tunneling on the scattered fields are provided. © 2018 Elsevier B.V., All rights reserved.