Spatially Dispersive Finite-Difference Time-Domain Method for Modelling of Sub-Wavelength Imaging by Wire Media

摘要

The wire medium is an artificial material formed by a regular lattice of ideally conducting wires. The radii of wires are assumed to be small compared to the lattice periods and the wavelength. The wire medium has been known for a long time [1, 2] as an artificial dielectric with plasma-like frequency dependent permittivity, but only recently it was shown that this dielectric is non-local and possesses also strong spatial dispersion even at very low frequencies [3].