Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanostructure design for surface-enhanced Raman spectroscopy - prospects
  and limits   Surface-enhanced Raman spectroscopy (SERS) allows single-molecule detection
due to the strong field localization occurring at sharp bends or kinks of the
metal-vacuum interface. An important question concerns the limits of the signal
enhancement that can be achieved via a judicious design of the surface. By
using a specific example of a technologically realizable nanopatterned surface,
we demonstrate that while very high enhancement factors (~10^12) can be found
for an ideal surface, these are unlikely to be achieved in laboratory samples,
because even a minute, inevitable rounding-off strongly suppresses the
enhancement, as well as shifts the optimal frequency. Our simulations indicate
that the geometric enhancement factors are unlikely to exceed ~10^8 for real
samples, and that it is necessary to consider the geometric uncertainty to
reliably predict the frequency for maximum enhancement.

6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin