Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Left-handed Band in an Electromagnetic Metamaterial Inducedby
  Sub-wavelength Multiple Scattering   Due to the deep sub-wavelength unit cell in metamaterials, the quasi-static
approximation is usually employed to describe the propagation. By making pairs
of resonators, we highlight that multiple scattering also occurs at this scale
and results in the existence of a dipolar resonance, which leads to a negative
index of refraction when we consider several resonators. We experimentally
verify the possibility of obtaining a negative index of refraction in periodic
metamaterials in two different ways, and eventually demonstrates a superlensing
effect in both cases.

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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph