Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fields radiated by a nanoemitter in a graphene sheet   The extraordinary properties of graphene make it a very promising material
for use in optoelectronics. However, this is still a nascent field, where some
basic properties of the electromagnetic field in graphene must be explored.
Here we report on the fields radiated by a nanoemitter lying on a graphene
sheet. Our results show that this field presents a rich dependence on both
frequency, distance to the source and dipole orientation. This behavior is
attributed to distinct peculiarities on the density of electromagnetic states
in the graphene sheet and the interaction between them. The field is mainly
composed of an core region of high-intensity electromagnetic field, dominated
by surface plasmons, and an outer region where the field is practically the
same it would be for an emitter in vacuum. Within the core region, the
intensity of the electric field is several orders of magnitude larger than what
it would be in vacuum. Importantly, the size of this core region can be
controlled thorough external gates, which opens up many interesting
applications in, for instance, surface optics and spectroscopy. Additionally,
the large coupling between nanoemitters and surface plasmons makes graphene
sheets a propitious stage for quantum-optics, in which the interaction between
quantum objects could be externally tailored at will.

31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin