Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excitation of plasmonic nanoantennas with nonresonant and resonant
  electron tunnelling   A rigorous theory of photon emission accompanied inelastic tunnelling inside
the gap of plasmonic nanoantennas has been developed. The disappointingly low
efficiency of the electrical excitation of surface plasmon polaritons in these
structures can be increased by orders of magnitude when a resonant tunnelling
structure is incorporated inside the gap. Resonant tunnelling assisted surface
plasmon emitter may become a key element in future electrically-driven
nanoplasmonic circuits.

23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph