Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanomechanical method to gauge emission quantum yield applied to
  NV-centers in nanodiamond   We present a technique to nanomechanically vary the distance between a
fluorescent source and a mirror, thereby varying the local density of optical
states at the source position. Our method can therefore serve to measure the
quantum efficiency of fluorophores. Application of our technique to NV defects
in diamond nanocrystals shows that their quantum yield can significantly differ
from unity. Relying on a lateral scanning mechanism with shear-force
probe-sample distance control our technique is straightforwardly implemented in
most state-of-the-art near-field microscopes.

9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat