Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spontaneous decay rate of an excited molecule placed near a circular
  aperture in a metal film   We have investigated the spontaneous decay rate of an excited molecule placed
near a circular aperture in a metal film of finite thickness and finite
conductivity. We have considered the metal film both suspended freely in vacuum
and lying on a substrate. A significant effect of molecule the position and the
presence of the substrate on the rate of spontaneous emission of the molecule
is shown. The asymptotes which can be used to describe this process are found.
Total, radiative, and non-radiative spontaneous decay rates of the excited
molecule are extracted and compared. The results may be useful in the
development and interpretation of experiments investigating a single molecule
with a scanning optical microscope and in the design of optical nanodevices
based on the control of elementary quantum systems emission with a nanohole.

29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph