1J2a-3 Vibrational modes of semiconductor nanopillars studied by picosecond ultrasonics(Measurement techniques)

Abstract

We investigate the vibrational modes of GaAs nanopillars of hexagonal cross section on a GaAs substrate using an ultrafast optical technique. The motions of the pillars after excitation with visible light pulses are detected using a time-delayed infrared light pulses. Thickness modes of the pillars are detected in the 10-30 GHz range.