Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin and Orbital angular momentum propagation in anisotropic media:
  theory   This paper is devoted to study the propagation of light beams carrying
orbital angular momentum in optically anisotropic media. We first review some
properties of homogeneous anisotropic media, and describe how the paraxial
formalism is modified in order to proceed with a new approach dealing with a
general setting of paraxial propagation along uniaxial inhomogeneous media.
This approach is suitable for describing the space-variant-optical-axis phase
plates.

19
The categories of this paper are: eess
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph