Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization properties of a symmetrical and asymmetrical nonreciprocal
  chiral photonic bandgap structure with defect   The polarization properties of perfectly periodical and defective
one-dimensional photonic bandgap structures with nonreciprocal chiral
(bi-isotropic) layers are studied. The method of solution is based on the
2x2-block-representation transfer-matrix formulation. Numerical simulations are
carried out for different type of structures (symmetrical or asymmetrical) in
order to reveal the dependence of the reflection and transmission coefficients
on frequency, chirality, nonreciprocity parameters, and the angle of wave
incidence.

2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc