Ultrafast Electron and Phonon Response of Oriented
and Diameter-Controlled Germanium Nanowire Arrays
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Abstract
Carrier and phonon dynamics in dense
arrays of aligned, single-crystal
Ge nanowires (NWs) of controlled diameter are investigated by ultrafast
optical pump–probe measurements, effective medium calculations,
and elasticity analysis. Both a pronounced induced absorption and
the amplitude and spectral range of Fabry–Perot oscillations
observed in the probe signal are predicted for the NW array/air metamaterial
by effective medium calculations. Detected temporal oscillations of
reflectivity are consistent with excitation of radial breathing mode
acoustic phonons by the intense pump pulse