Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proposal for Optical Super-Focusing with a Metal-Dielectric Waveguide
  Array   In this paper, super-focusing using radiationless electromagnetic
interference is extended to the visible regime. It is shown that the
highest-order mode of a specifically designed metal-dielectric waveguide array
can provide the rapidly oscillating source field for radiationless
interference. Using finite-difference time-domain simulations, an example
structure is demonstrated. This structure provides focusing to 0.21 of the
optical wavelength at a distance of half the optical wavelength from the
source.

15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph