Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetically induced transparency for guided light in an atomic
  array outside an optical nanofiber   We study the propagation of guided light along an array of three-level atoms
in the vicinity of an optical nanofiber under the condition of
electromagnetically induced transparency. We examine two schemes of atomic
levels and field polarizations where the guided probe field is quasilinearly
polarized along the major or minor principal axis, which is parallel or
perpendicular, respectively, to the radial direction of the atomic position.
Our numerical calculations indicate that 200 cesium atoms in a linear array
with a length of 100 $\mu$m at a distance of 200 nm from the surface of a
nanofiber with a radius of 250 nm can slow down the speed of guided probe light
by a factor of about $3.5\times 10^6$ (the corresponding group delay is about
1.17 $\mu$s). In the neighborhood of the Bragg resonance, a significant
fraction of the guided probe light can be reflected back with a negative group
delay. The reflectivity and the group delay of the reflected field do not
depend on the propagation direction of the probe field. However, when the input
guided light is quasilinearly polarized along the major principal axis, the
transmittivity and the group delay of the transmitted field substantially
depend on the propagation direction of the probe field. Under the Bragg
resonance condition, an array of atoms prepared in an appropriate internal
state can transmit guided light polarized along the major principal in one
specific direction even in the limit of infinitely large atom numbers. The
directionality of transmission of guided light through the array of atoms is a
consequence of the existence of a longitudinal component of the guided light
field as well as the ellipticity of both the field polarization and the atomic
dipole vector.

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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: q-alg