Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Twist Defect in Chiral Photonic Structures   We demonstrate that twisting one part of a chiral photonic structure about
its helical axis produces a single circularly polarized localized mode that
gives rise to an anomalous crossover in propagation. Up to a crossover
thickness, this defect results in a peak in transmission and exponential
scaling of the linewidth for a circularly polarized wave with the same
handedness as structure. Above the crossover, however, the linewidth saturates
and the defect mode can be excited only by the oppositely polarized wave,
resulting in a peak in reflection instead of transmission.

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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con