(Color online) Extinction spectra of nanorod samples in polycarbonate templates: (a) Au with nominal pore diameters of (black) and (red) and Ni with nominal pore diameters of (blue) and (green) and (b) Pd with nominal pore diameters of (black) and (blue). The sharp bands in the infrared are due to the polycarbonate template, as can be seen in the spectrum for the empty nominal pore template (dashed line).
(Color online) Calculated (filled circles) band peak position using the Gans theory for Au (black), Ni (red), and Pd (green) nanorods as a function of the aspect ratio using a medium dielectric constant of 2.5. Open squares are the experimental peak positions (with the same colors for the various metals) for the 10 and pore samples with estimated aspect ratios of 45 and 68, respectively.
Normalized mid-IR transient absorption scans for Ni sample using a pump. The probe frequency is listed in the figure. The data near show interferences near from atmospheric water. The solid lines are fits to an exponential decay plus a long-lived signal.
(Color online) Visible transient absorption scans for the nanorod samples using a pump. The probe wavelengths are (blue), (green), (yellow), (red), and (black). Solid lines are fits including a damped cosine along with an exponential decay to a persistent signal as described in the text. The fits for Au data do not include the damped cosine.
pump, probe transient absorption scans for the 10 (open symbol) and (closed symbols) Pd nanorods. Solid lines are fits including a damped cosine along with an exponential decay to a persistent signal as described in the text.
Transient absorption scans using an probe for mid-IR (centered near , filled squares) and (empty squares) pump pulses. The pump data have been normalized to the magnitude of the IR pump data. The data are displaced for clarity. The solid lines are fits of the IR pump data with the same function used to fit the pump data in Fig. 4.
Parameters determined for the dynamics of Au and Ni nanorods. is the electron phonon coupling time, is the measured breathing mode oscillation period.
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