Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proof of concept for an ultrasensitive meta-device to detect and
  localize nonlinear elastic sources   The appearance of nonlinear effects in elastic wave propagation is one of the
most reliable and sensitive indicators of the onset of material damage.
However, these effects are usually very small and can be detected only using
cumbersome digital signal processing techniques. Here, we propose and
experimentally validate an alternative approach, using the filtering and
focusing properties of elastic metamaterials to naturally select the higher
harmonics generated by nonlinear effects and to increase their signal-to noise
ratios, enabling the realization of time-reversal procedures for nonlinear
elastic source detection. The proposed device demonstrates its potential as an
efficient, compact, portable, passive apparatus for nonlinear elastic wave
sensing and damage detection.

35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio