Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exciting surface plasmon polaritons in the Kretschmann configuration by
  light beam   We consider exciting surface plasmon polaritons in the Kretschmann
configuration. Contrary to common belief, we show that a plane wave incident at
an angle greater than the angle of total internal reflection does not excite
surface plasmon polaritons. These excitations do arise, however, if the
incident light forms a narrow beam composed of an infinite number of plane
waves. The surface plasmon polariton is formed at the geometrical edge of the
beam as a result of interference of reflected plane waves.

33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics