Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graphene, plasmons and transformation optics   Here we study subwavelength gratings for coupling into graphene plasmons by
means of an an- alytical model based on transformation optics that is not
limited to very shallow gratings. We consider gratings that consist of a
periodic modulation of the charge density in the graphene sheet, and gratings
formed by this conductivity modulation together with a dielectric grating
placed in close vicinity of the graphene. Explicit expressions for the
dispersion relation of the plasmon po- laritons supported by the system, and
reflectance and transmittance under plane wave illumination are given. We
discuss the conditions for maximising the coupling between incident radiation
and plasmons in the graphene, finding the optimal modulation strength for a
conductivity grating.

33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
2
The categories of this paper are: math
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol