Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Subwavelength effects near a dielectric microcylinder illuminated by a
  diffraction-free beam   Generation of a photonic nanojet by a linearly polarized wave beam or a plane
wave impinging a dielectric microcylinder implies partial conversion of the
propagating waves into the evanescent ones. This conversion is manifested in
nanojet waist of subwavelength effective width. However, this known near-field
effect is relatively weak. We theoretically show that the incidence of a wave
beam formed by two plane waves enables much stronger near-field effects: a
deeply subwavelength focusing of the incident beam and a strong enhancement of
the electric field on the whole cylinder surface and near it. The domination of
the evanescent waves in the vicinity of the cylinder results from the
destructive interference of the propagating spatial harmonics of the scattered
field dictated by the incident wave beam.

6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math