Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Periodic metal resonator chains for Surface Enhanced Raman Scattering
  (SERS)   A periodic arrangement of chains of gold discs shows pronounced plasmonic
grating resonances. These have a clear impact on the Surface Enhanced Raman
Scattering (SERS)-signal from 4-methylbenzenethiol molecules which form
self-assembled monolayers on the gold surface: Besides a clear polarisation
dependence the SERS-spectra also exhibit a maximum when the excitation laser
wavelength matches the plamonic grating resonance. These features are explained
by a combined near and far field coupling of the individual plasmonic dipoles
allowing the design of optimized nanostructures for effective SERS-substrates
in the future.

22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex