Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cascaded Second-order Surface Plasmon Solitons due to Intrinsic Metal
  Nonlinearity   We theoretically show the existence of cascaded second-order surface plasmon
solitons propagating at the interface between metal and linear dielectric.
Nonlocal multipole nonlinearities originating from free conduction electron
plasma of a metal lead to strong interaction between co-propagating surface
plasmon polariton beams at fundamental and second harmonic frequencies. Finite
element numerical modelling for effective two-dimensional medium explicitly
demonstrates the solitons formation, confirming the theoretical results. The
non-diffractive regime of propagation has been demonstrated at silica/silver
interface for 5{\lambda} wide surface plasmon polariton beams with the
loss-limited propagation distance of the order of 100 um for the 750/1550 nm
wavelengths pair. Plasmon-soliton formation in the phasematched conditions has
been shown to be beneficial for nondiffractive surface plasmon polariton
propagation.

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The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
18
The categories of this paper are: econ
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con