Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dual and chiral objects for optical activity in general scattering
  directions   Optically active artificial structures have attracted tremendous research
attention. Such structures must meet two requirements: Lack of spatial
inversion symmetries and, a condition usually not explicitly considered, the
structure shall preserve the helicity of light, which implies that there must
be a vanishing coupling between the states of opposite polarization handedness
among incident and scattered plane waves. Here, we put forward and demonstrate
that a unit cell made from chiraly arranged electromagnetically dual scatterers
serves exactly this purpose. We prove this by demonstrating optical activity of
such unit cell in general scattering directions.

7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat