Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Type II Perfect Absorption and Amplification Modes with Controllable
  Bandwidth in PT-Symmetric/Traditional Bragg Grating Combined Structures   We reveal previously unnoticed Type II perfect absorption and amplification
modes of optical scattering system. These modes, in contrast to the
counterparts in recent works [Phys. Rev. A 82, 031801 (2010); Phys. Rev. Lett.
106, 093902 (2011).] which could be referred as Type I modes, appear at a
continuous region along the real frequency axis with any frequency. The Type II
modes can be demonstrated in the PT-symmetric/traditional Bragg grating
combined structures. A series of exotic nonreciprocal absorption and
amplification behaviours are observed in the combined structures, making them
have potential for versatile devices acting simultaneously as a perfect
absorber, an amplifier, and an ultra-narrowband filter. Based on the properties
of Type II modes, we also propose structures with controllable perfect
absorption and amplification bandwidth at any single or multiple wavelengths.

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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: astro-ph