Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Controlling the non-linear emission of upconversion nanoparticles to
  enhance super-resolution imaging performance   Upconversion nanoparticles (UCNPs) exhibit unique optical properties such as
photo-emission stability, large anti-Stokes shift, and long excited-state
lifetimes, allowing significant advances in a broad range of applications from
biomedical sensing to super-resolution microscopy. In recent years, progress on
nanoparticle synthesis led to the development of many strategies for enhancing
their upconversion luminescence, focused in particular on heavy doping of
lanthanide ions and core-shell structures. In this article, we investigate the
non-linear emission properties of fully Yb-based core-shell UCNPs and their
impact on the super-resolution performance of stimulated excitation-depletion
(STED) microscopy and super-linear excitation-emission (uSEE) microscopy.
Controlling the power-dependent emission curve enables us to relax constraints
on the doping concentrations and to reduce the excitation power required for
accessing sub-diffraction regimes. We take advantage of this feature to
implement multiplexed super-resolution imaging of a two-sample mixture.

9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph