Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2978197
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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. (C) 2008 American Institute of Physics.
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