Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nitrogen-vacancy defect emission spectra in the vicinity of an
  adjustable silver mirror   Optical emitters of quantum radiation in the solid state are important
building blocks for emerging technologies making use of the laws of quantum
mechanics. The efficiency of photon extraction from the host material is low
for many solid-state systems due to their relatively high index of refraction.
In this article we experimentally study the emission spectrum of an ensemble of
nitrogen-vacancy defects implanted around 8nm below the planar diamond surface
and in the vicinity of a planar silver mirror. Scanning the distance between
diamond and the mirror, we observe an enhancement of the spectral emission
power by up to a factor of 3. We construct a model based on classical dipoles
and elucidate the observations as being caused by interference in the far field
of the emitters.

8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio