Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nondestructive on-chip detection of optical orbital angular momentum
  through a single plasmonic nanohole   Optical orbital angular momentum (OAM) provides an additional dimension for
photons to carry information in high-capacity optical communication. Although
the practical needs have intrigued the generations of miniaturized devices to
manipulate the OAM modes in various integrated platforms, the on-chip OAM
detection is still challenging to match the newly-developed compact OAM emitter
and OAM transmission fiber. Here, we demonstrate an ultra-compact device, i.e.,
a single plasmonic nanohole, to efficiently measure an optical beam's OAM state
in a nondestructive way. The device size is reduced down to a few hundreds of
nanometers, which can be easily fabricated and installed in the current OAM
devices. It is a flexible and robust way for in-situ OAM monitoring and
detection in optical fiber networks and long-distance optical communication
systems. With proper optimization of the nanohole parameters, this approach
could be further extended to discriminate the OAM information multiplexed in
multiple wavelengths and polarizations.

14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th