Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Numerical Study of Evanescent Fields in Backward-Wave Slabs   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.

23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex