Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gate-tunable nearly total terahertz absorption in graphene with resonant
  metal back reflector   The gate-tunable terahertz (THz) absorption of graphene layers with a
resonant metal back reflector (RMBF) is theoretically investigated. We
demonstrate that the THz absorption of graphene with RMBF can vary from nearly
negligible to nearly total by tuning the external gate voltage. This peculiar
nearly total THz absorption can be attributed to the Fabry-Perot cavity effect,
which enhances the absorption and reduces the reflection of graphene. The
absorption spectra of the graphene-RMBF structure can also be tailored in
bandwidth and center frequency by changing the thickness and dielectric
constant of the spacer layer.

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The categories of this paper are: cs
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org