Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement of light transmission through randomly located copper
  nano-islands near the percolation threshold   We report the absorption/transmission properties of thin copper films
slightly below the percolation limit produced by laser ablation; these samples
show randomly positioned islands. Two types of films are grown: in the first
type, copper is deposited on glass, and it is shown that as the amount of
deposited copper approaches the percolation limit, the samples show enhanced
light transmission; in the second set of samples, made of TiO$_2$/Cu/TiO$_2$
layers, the presence of titanium oxide inhibits light transmission enhancement,
even though the same amount of copper has been deposited compared to the
samples deposited on glass. We also present numerical calculations based on the
discrete dipole method to simulate the optical behaviour of the copper films.
The enhanced light transmission of the samples presented in this work resembles
the Extraordinary Optical Transmission (EOT) observed in periodic metallic
structures. The similarities and differences between experiment and numerical
calculations and the possible use of these films as sensors are discussed.

12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th