Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reconstructing the Poynting vector skew angle and wave-front of optical
  vortex beams via two-channel moir\'e deflectometery   A novel approach based on the two-channel moir\'e deflectometry has been used
to measure both wave-front and transverse component of the Poynting vector of
an optical vortex beam. Generated vortex beam by the q-plate, an inhomogeneous
liquid crystal cell, has been analyzed with such technique. The measured
topological charge of generated beams are in an excellent agreement with
theoretical prediction.

22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat