Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mode-matching in multiresonant plasmonic nanoantennas for enhanced
  second harmonic generation   Boosting nonlinear frequency conversion in extremely confined volumes remains
a key challenge in nano-optics, nanomedicine, photocatalysis, and
background-free biosensing. To this aim, field enhancements in plasmonic
nanostructures are often exploited to effectively compensate for the lack of
phase-matching at the nanoscale. Second harmonic generation (SHG) is, however,
strongly quenched by the high degree of symmetry in plasmonic materials at the
atomic scale and in nanoantenna designs. Here, we devise a plasmonic
nanoantenna lacking axial symmetry, which exhibits spatial and frequency mode
overlap at both the excitation and the SHG wavelengths. The effective
combination of these features in a single device allows obtaining unprecedented
SHG conversion efficiency. Our results shed new light on the optimization of
SHG at the nanoscale, paving the way to new classes of nanoscale coherent light
sources and molecular sensing devices based on nonlinear plasmonic platforms.

14
The categories of this paper are: math-ph
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org