Densely packed arrays (76% volume fraction) of 10 μm diameter parallel indium wires exhibit an enhanced transmission, of ∼103, relative to an indium foil of equal thickness for far-infrared (k<80 cm−1) propagating along the wire length. The absorption increases as k0.45±0.07 and is explained by the dynamic Maxwell–Garnett model, which includes eddy current dissipation. The effective surface conductivity is depressed fiftyfold with respect to the bulk. The implications for plasmons in metal wire microstructures and for developing simultaneously transmissive and conductive composites are discussed.
According to effective medium theories, electrically conducting composites consisting of parallel metal wires embedded in a transparent dielectric can propagate light in the direction of the wire length. We have prepared densely packed arrays (76% volume fraction) of 10-rim diameter indium wires by high pressure injection of glass microchannel plates. For wavelengths longer than 100 Rtm (k<100 cm-) the absorption of the wire array is almost three orders of magnitude smaller than that of an indium foil of equal thickness. The measured absorption increases as k°' 45 -0 7 and can be accounted for by including magnetic dipole effects.
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