Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On planewave remittances and Goos-Haenchen shifts of planar slabs with
  negative real permittivity and permeability   Two results about the planewave response of an isotropic,
dielectric--magnetic, homogeneous, planar slab are deduced when the real parts
of both the permittivity and the permeability are altered from positive to
negative. First, the reflection and the transmission coefficients suffer phase
reversals without change in their respective magnitudes. Second, the
Goos-Haenchen shifts experienced by beams on total reflection reverse their
directions.

28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th