Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dielectric properties of ultrathin metal films around the percolation
  threshold   We report on optical reflection measurements of thin Au films at and around
the percolation threshold (film thickness 3 to 10 nm) in an extremely broad
spectral range from 500 to 35000 cm-1 (0.3 - 20 *10-6 m). Combining
spectroscopic ellipsometry and Fourier-transform infrared spectroscopy, the
dielectric properties of the films can be described over the whole frequency
range by Kramers-Kronig consistent effective dielectric functions. The optical
conductivity of the films is dominated by two contributions: by a
Drude-component starting at the percolation threshold in the low frequency
range and a plasmon in the near-infrared region, which shifts down in frequency
with increasing film thickness. The interplay of both components leads to a
dielectric anomaly in the infrared region with a maximum of the dielectric
constant at the insulator-to-metal transition.

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The categories of this paper are: physics
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph