Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tornado waves   We show that light spiraling like a tornado can be generated by superimposing
abruptly auto-focusing ring-Airy beams that carry orbital angular momentum of
opposite handedness. With different parabolic propagation trajectories, the
superimposing ring-Airy beams are tailored to abruptly auto-focus at
overlapping focal regions. This results to a complex wave with intense lobes
that twist and shrink in an accelerating fashion along propagation. By
achieving angular acceleration values that exceed 295 rad\mm^2, these Tornado
waves can find numerous applications in laser trapping, direct laser writing
and high harmonic generation.

7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin