Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Near-field plasmonics for generation of phonon lasing in a thermal
  nanomachine   Recent advances in near-field plasmonics, i.e. metamaterials, have
demonstrated the ability to generate localized fields of high intensity, and
thus maintain relatively large nanoscale heat gradients on the order of
$10^1-10^2$~K/nm. A plasmonic near-field transducer (NFT) can achieve such
large gradients, making population inversion achievable within phononic media.
We herein develop a~thermal nanomachine composed of a nanoscale phononic laser
that uses an NFT as a plasmonic energy source. We show the generation of
phonons on demand having full control of the proposed phonon lasing medium.

31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc