Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solid immersion lens-enhanced micro-photoluminescence: principle and
  applications   We demonstrate the combination of a hemispherical solid immersion lens with a
micro-photoluminescence setup. Two advantages introduced by the SIL, an
improved resolution of 0.4 times the wavelength in vacuum and a 5 times
enhancement of the collection efficiency, make it an ideal system for spatially
resolved spectroscopy applications. The influence of the air gap between the
SIL and the sample surface is investigated in detail. We confirm the tolerance
of the set--up to an air gap of several micrometers. Such a system is proven to
be ideal system in the studies of exciton transport and polarization dependent
single quantum dot spectroscopy.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol