Coherent control of gigahertz surface acoustic and bulk phonons using ultrafast optical pulses

Hurley, D. H.; Lewis, R.; Wright, O. B.; Matsuda, O.
September 2008
Applied Physics Letters;9/15/2008, Vol. 93 Issue 11, p113101
Academic Journal
We demonstrate the coherent generation and control of gigahertz acoustic phonons with ultrafast optical pulses. Two distinct acoustic phonon modes, a surface acoustic phonon mode and a longitudinal acoustic phonon mode, are generated simultaneously by irradiating nanolithographic absorption gratings on semiconductor substrates. Two material systems are examined: suboptical wavelength aluminum absorption gratings on Si and GaAs substrates. Constructive and complete destructive interference conditions are demonstrated using two pump pulses derived from a single Michelson interferometer.


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