Open AccessOptical near-field analysis of spherical metals: Application of the FDTD method combined with the ADE method
Author(s) -
Takashi Yamaguchi,
Takashi Hinata
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.011481
Subject(s) - finite difference time domain method , hyperboloid model , mie scattering , optics , maxwell's equations , physics , electromagnetic field , computational physics , lorentz transformation , drude model , materials science , classical mechanics , light scattering , scattering , quantum mechanics , minkowski space
The time-average energy density of the optical near-field generated around a metallic sphere is computed using the finite-difference time-domain method. To check the accuracy, the numerical results are compared with the rigorous solutions by Mie theory. The Lorentz-Drude model, which is coupled with Maxwell's equation via motion equations of an electron, is applied to simulate the dispersion relation of metallic materials. The distributions of the optical near-filed generated around a metallic hemisphere and a metallic spheroid are also computed, and strong optical near-fields are obtained at the rim of them.