Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Directional out-coupling of light from a plasmonic nanowire-nanoparticle
  junction   We experimentally show how a single Ag nanoparticle (NP) coupled to an Ag
nanowire (NW) can convert propagating surface plasmon polaritons to directional
photons. By employing dual-excitation Fourier microscopy with spatially
filtered collection-optics, we show single- and dual-directional out-coupling
of light from NW-NP junction for plasmons excited through glass-substrate and
air-superstrate. Furthermore, we show NW-NP junction can influence the
directionality of molecular-fluorescence emission, thus functioning as an
optical antenna. The results discussed herein may have implications in
realizing directional single-photon sources and quantum plasmon circuitry.

16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga