Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunable mid-infrared coherent perfect absorption in a graphene
  meta-surface   We exploited graphene nanoribbons based meta-surface to realize coherent
perfect absorption (CPA) in the mid-infrared regime. It was shown that
quasi-CPA frequencies, at which CPA can be demonstrated with proper phase
modulations, exist for the graphene meta-surface with strong resonant
behaviors. The CPA can be tuned substantially by merging the geometric design
of the meta-surface and the electrical tunability of graphene. Furthermore, we
found that the graphene nanoribbon meta-surface based CPA is realizable with
experimental graphene data. The findings of CPA with graphene meta-surface can
be generalized for potential applications in optical detections and signal
processing with two-dimensional optoelectronic materials.

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th