Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Demonstration of the enhanced Purcell factor in all-dielectric
  structures   The Purcell effect is usually described as a modification of the spontaneous
decay rate in the presence of a resonator. In plasmonics, this effect is
commonly associated with a large local-field enhancement in "hot spots" due to
the excitation of surface plasmons. However, high-index dielectric
nanostructures, which become the basis of all-dielectric nanophotonics, can not
provide high values of the local-field enhancement due to larger radiation
losses. Here, we demonstrate how to achieve a strong Purcell effect in
all-dielectric nanostructures, and show theoretically that the Purcell factor
can be increased by two orders of magnitude in a finite chain of silicon
nanoparticles. Using the eigenmode analysis for an infinite chain, we
demonstrate that the high Purcell factor regime is associated with a Van Hove
singularity. We perform a proof-of-concept experiment for microwave frequencies
and observe the 65-fold enhancement of the Purcell factor in a chain of 10
dielectric particles.

29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin