Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Positive and Negative Goos-Hanchen Shifts and Negative Phase--Velocity
  Mediums (alias Left-Handed Materials)   On total reflection from a half-space filled with an isotropic, homogeneous,
weakly dissipative, dielectric-magnetic medium with negative phase-velocity
(NPV) characteristics, it is shown here that a linearly polarized beam can
experience either a negative or a positive Goos-Hanchen shift. The sign of the
shift depends on the polarization state of the beam as well as on the signs of
the real parts of the permittivity and the permeability of the NPV medium.

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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-th
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The categories of this paper are: math