Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sharp dark-mode resonances in planar metamaterials with broken
  structural symmetry   We report that resonant response with a very high quality factor can be
achieved in a planar metamaterial by introducing symmetry breaking in the shape
of its structural elements, which enables excitation of dark modes, i.e. modes
that are weakly coupled to free space.

4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga