Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Image of Veselago lens based upon two-dimensional photonic crystal with
  triangular lattice   The construction of the multi-focal Veselago lens predicted earlier is
proposed on the basis of a uniaxial photonic crystal consisting of cylindrical
air holes in silicon that make a triangular lattice in a plane perpendicular to
the axis of the crystal. The object and image are in air. The period of the
crystal should be $0.44\mu{\rm m}$ to work at the wavelength $1.5\mu{\rm m}$.
The lens does not provide superlensing but the half-width of the image is
$0.5\lambda$. The lens is shown to have wave guiding properties depending on
the substrate material.

31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat