Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Large negative lateral shifts from the Kretschmann-Raether
  configuration with left-handed materials" Appl. Phys. Lett. 87, 221102, 2005   The negative shifts seen by Wang and Zhu are not due to the excitation of
surface plasmons but to leaky modes of the slab propagating backward. Provided
the characteristics of the LHM slab are chosen correctly, it is shown that a
leaky surface plasmon can actually be excited using the KR configuration.

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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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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: atom-ph