Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Necklace Beam Generation in Nonlinear Colloidal Engineered Media   Modulational instability is a phenomenon that reveals itself as the
exponential growth of weak perturbations in the presence of an intense pump
beam propagating in a nonlinear medium. It plays a key role in such nonlinear
optical processes as supercontinuum generation, light filamentation, and rogue
waves. However, practical realization of these phenomena in the majority of
available nonlinear media still relies on high-intensity optical beams. Here,
we analytically and numerically show the possibility of necklace beam
generation originating from low-intensity spatial modulational instability of
vortex beams in engineered soft-matter nonlinear media.

23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom