Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fabrication and characterization of high quality factor silicon nitride
  nanobeam cavities   Si3N4 is an excellent material for applications of nanophotonics at visible
wavelengths due to its wide bandgap and moderately large refractive index (n
$\approx$ 2.0). We present the fabrication and characterization of Si3N4
photonic crystal nanobeam cavities for coupling to diamond nanocrystals and
Nitrogen-Vacancy centers in a cavity QED system. Confocal
micro-photoluminescence analysis of the nanobeam cavities demonstrates quality
factors up to Q ~ 55,000, which is limited by the resolution of our
spectrometer. We also demonstrate coarse tuning of cavity resonances across the
600-700nm range by lithographically scaling the size of fabricated devices.
This is an order of magnitude improvement over previous SiNx cavities at this
important wavelength range.

12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph