Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exposing and extending the interior waves field by transformation
  materials   Based on transformation optics, a strategy is proposed to expose the inner
one-dimensional space of a wave field inside a beam volume to the surface of
the propagation medium and extend the space from one-dimensional to
two-dimensional, allowing the corresponding field distribution to be detected
directly and more subtly, which is important in optical signal processing. The
method is applied to the quadratic graded index lens to construct a new graded
index lens, and its enhanced chirpyness detection ability is demonstrated by
numerical simulation.

22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex