Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Disordered one-dimensional photonic structures composed by more than two
  materials with the same optical thickness   The optical properties of photonic structures made with more than two
materials are very interesting for optical filtering and lighting applications.
Herein, we compared the transmission properties of one-dimensional photonic
crystals made with three, four and five materials, showing that, with a
photonic crystal made of t different materials, the band gap splits in t-1
bands. The same optical thickness for the different materials layers results in
split photonic band gaps with the same intensity. Photonic crystals with more
than two materials result in a simple structure that could be used for
multi-feature optical filters, or that could provide feedback for
multi-emission distributed feedback lasers. Furthermore, we analyzed the
transmission properties of ternary and quaternary random photonic structures.
These materials could very interesting for light trapping in photovoltaic
devices.

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The categories of this paper are: hep-ph
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The categories of this paper are: econ
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
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The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: stat
20
The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn