A Numerical Study of Evanescent Fields in Backward-Wave Slabs
Condensed Matter
2007-05-23 v1
Abstract
Numerical study of evanescent fields in an isotropic backward-wave (BW) (double negative or "left-handed") slab is performed with the FDTD method. This system is expected to be able to restore all spatial Fourier components of the spectrum of a planar source, including evanescent fields, realizing a "superlens". The excitation of surface modes on the interfaces of the slab, which is the key process responsible for the sub-wavelength focusing, is numerically confirmed and the time-domain field behavior is studied. In particular, a numerical verification of the amplification of evanescent modes by an isotropic BW slab with epsilon=mu=-1 is provided.
Cite
@article{arxiv.cond-mat/0302407,
title = {A Numerical Study of Evanescent Fields in Backward-Wave Slabs},
author = {M. K. Karkkainen and S. A. Tretyakov and S. I. Maslovski and P. A. Belov},
journal= {arXiv preprint arXiv:cond-mat/0302407},
year = {2007}
}
Comments
4 pages, figures