Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stimulated Emission Depletion Microscopy with Color Centers in Hexagonal
  Boron Nitride   Stimulated emission depletion, or STED microscopy is a well-established
super-resolution technique, but is ultimately limited by the chosen
flourophore. Here we demonstrate STED microscopy with color centers in
nanoscale flakes of hexagonal boron nitride using time-gated continuous wave
STED. For color centers with zero phonon line emission around 580 nm we measure
a STED cross-section of (5.5 $\pm$ 3.2) x $10^{-17} \mbox{cm}^{2}$, achieve a
resolution of $\sim$ 50 nm and resolve two color centers separated by 250 nm,
which is less than the diffraction limit. The achieved resolution is limited by
the numerical aperture of the objective lens (0.8) and the available laser
power, and we predict that a resolution of sub-10 nm can be achieved with an
oil immersion objective lens, similar to state-of-the-art resolution obtained
with nitrogen vacancy centers in diamond.

20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph