Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface plasmons and magneto-optic activity in hexagonal Ni anti-dot
  arrays   The influence of surface plasmons on the magneto-optic activity in a
two-dimensional hexagonal array is addressed. The experiments were performed
using hexagonal array of circular holes in a ferromagnetic Ni film. Well
pronounced troughs are observed in the optical reflectivity, resulting from the
presence of surface plasmons. The surface plasmons are found to strongly
enhance the magneto-optic response (Kerr rotation), as compared to a continuous
film of the same composition. The influence of the hexagonal symmetry of the
pattern on the coupling between the plasmonic excitations is demonstrated,
using optical diffraction measurements and theoretical calculations of the
magneto-optic and of the angular dependence of the optical activity.

22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph