Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron emission by long and short wavelength lasers: essentials for
  the design of plasmonic photocathodes   Theory of electron emission by metallic photocathodes under the exposure of
long wavelength lasers will be studied. Energy of photons in long wavelength
lasers is less than the work function of the photocathode material, and can
only emit electrons via tunneling through the potential barrier. The optical
resonance effect (e.g. plasmonic resonances) will be studied as an improvement
to the performance of photocathodes. This paper is intended to provide
self-sufficient materials to design optical resonant surfaces (e.g.
metasurfaces) for electron emission applications.

10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph