Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perfect anomalous splitter by acoustic meta-grating   As an inversely designed artificial device, metasurface usually means densely
arranged meta-atoms with complex substructures. In acoustics, those meta-atoms
are usually constructed by multi-folded channels or multi-connected cavities of
deep sub-wavelength feature, which limits their implementation in pragmatic
applications. We propose here a comprehensive concept of a perfect anomalous
splitter based on an acoustic meta-grating. The beam splitter is designed by
etching only two or four straight-walled grooves per period on a planar hard
surface. Different from the recently reported reflectors or splitters, our
device can perfectly split an incident wave into different desired directions
with arbitrary power flow partition. In addition, because ultrathin
substructures with thin walls and narrow channels are avoided in our design
procedure, the proposed beam splitter can be used for waves with much shorter
wavelength compared to the previous suggested systems. The design is
established by rigorous formulae developed under the framework of the grating
theory and a genetic optimization algorithm. Numerical simulation and
experimental evidence are provided to discuss the involved physical mechanism
and to give the proof-of-concept for the proposed perfect anomalous acoustic
splitter.

36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph