Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancing the absorption of graphene in the terahertz range   We study graphene on a photonic crystal operating in the terahertz (THz)
spectral range. We show that the absorption of graphene becomes a modulated
function of frequency and can be enhanced by more than three times at specific
frequency values, depending on the parameters of the system. The problem of a
semi-infinite photonic crystal is also solved.

29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th