Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reflected wavefront manipulation by acoustic metasurface with
  anisotropic local resonant units   Metasurfaces with planar profile and wave front shaping capabilities would be
ideally suitable to improve the performance of acoustic wave-based
applications. It is significant that the general Snell's law provides a new
approach to engineer the phase profile of reflected acoustic wave. Here, we
present a new type of acoustic metasurface based on three-component composites
which contain a steel ball coated with a thin elliptical layer of silicone
rubber and embedded in epoxy. The acoustic metasurface with changeable radii of
steel balls can realize the anomalous reflections, a planar acoustic lens
through designed gradient phase profile. The acoustic metasurface contained
with elaborately selected three-component composites, as a skin cloak,
successfully achieve the acoustical invisibility.

23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th