Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Controllable coherent perfect absorption in a composite film   We exploit the versatility provided by metal--dielectric composites to
demonstrate controllable coherent perfect absorption (CPA) in a slab of
heterogeneous medium. The slab is illuminated by coherent light from both
sides, at the same angle of incidence and the conditions required for CPA are
investigated as a function of the different geometrical parameters. The
simultaneous realization of CPA at two distinct frequencies is also shown.
Finally, our calculations clearly elucidate the role of absorption as a
necessary prerequisite for CPA.

18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an