Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superscattering, Superabsorption, and Nonreciprocity in Nonlinear
  Antennas   We propose tunable nonlinear antennas based on an epsilon-near-zero material
with a large optical nonlinearity. We show that the absorption and scattering
cross sections of the antennas can be controlled dynamically from a nearly
superscatterer to a nearly superabsorber by changing the intensity of the laser
beam. Moreover, we demonstrate that a hybrid nonlinear antenna, composed of
epsilon-near-zero and high-index dielectric materials, exhibits nonreciprocal
radiation patterns because of broken spatial inversion symmetry and large
optical nonlinearity of the epsilon-near-zero material. By changing the
intensity of the laser, the radiation pattern of the antenna can be tuned
between a bidirectional and a unidirectional emission known as a Huygens
source. Our study provides a novel approach toward ultrafast dynamical control
of metamaterials, for applications such as beam steering and optical limiting.

12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
18
The categories of this paper are: econ
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin