Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The optical performance of a dielectric-metal-dielectric anti-reflective
  absorber structure   The absorption of electromagnetic radiation by a planar structure, consisting
of a three-layer dielectric-metal-dielectric coating on a metal back-reflector
is analysed. The conditions for total absorption are derived. Our analysis
shows that, in contrast with bi-layer structures, the calculated layer
thicknesses are feasible to fabricate for any metal. The proposed absorber
design is of potential use in infrared and longer wavelength detectors and for
radiant energy harvesting devices.

7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math