Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quadruple-enhanced four-wave mixing in nanometer plasmonic hotspots:
  classical theory and experiments   Efficiency is a critical factor limiting the applications of nonlinear
plasmonic devices. We show by theory and experiments that high efficiency
four-wave mixing (FWM) is achieved in nanometer size plasmonic hotspots, which
open up opportunities for nanoscale light manipulation. First, we present a
classical calculation on the efficiency of frequency conversion by
quadruple-enhanced FWM for a Kerr nonlinear material loaded in the plasmonic
hotspot of a gold nanosphere dimer. The results indicate the viability to
achieve over 10% efficiency in a nanometer volume under milliwatts of pump
power consumption or less. Next, we present experimental results which show
around 10% linewidth broadening of a 100 fs pulsed laser by a monolayer
graphene in a gold nanosphere-plane junction. Such a high efficiency, low
power, and nanoscale nonlinear process is a promising candidate for making
ultra-compact and high-speed nonlinear optical devices.

5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom