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Relative transmittance (parallel polarization) for nanowires (, as known from preparation, and wire-wire distance) with different as given . Since all the IR spectra were taken with an aperture of , a different number of nanowires (an approximate value is indicated together with the length ) contribute to the IR signal for different .
Resonance wavelength vs length for nanowires with and ; full squares correspond to experimental data. Data without error bar are obtained for individual wires ( wire-wire distance). The dotted line indicates the fit to the experimental data using Novotny’s formula. The only free fitting parameter was the refractive index . Calculations with the same theory but using (vacuum) and (ZnS), respectively, are shown for comparison.
FDTD modeling of IR transmittance at the fundamental antenna resonance for different and (gold). The smallest is the room-temperature textbook value of gold (see Ref. 21), the value describes the resistivity of electrochemically grown gold wires (see Ref. 33). The highest value corresponds to a charge carrier mean free path of only 4 nm. Due to computing power limitations the spectral resolution was chosen to and the lateral resolution to 12.5 nm. The antenna was assumed to have , , and , and the substrate described as ZnS.
Comparison of the relative extinction cross sections (electric field parallel to the long wire axis) of one lithographic nanowire (nanostripe) on ZnS and one electrochemically grown cylindrical nanowire with similar of about on ZnS and .
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