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Generation of frequency-tunable nanoacoustic waves by optical coherent control

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6 Author(s)
Yu, Cheng-Ta ; Department of Electrical Engineering and Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei 10617, Taiwan ; Lin, Kung-Hsuan ; Hsieh, Chia-Lung ; Pan, Chang-Chi
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We have developed a system to generate arbitrary wave-form nanoacoustic waves (NAWs) with a piezoelectric InGaN/GaN single-quantum well. Based on an optical coherent control technique, acoustic frequency tunability in the subterahertz range is realized within only one fixed sample. The acoustic generation mechanisms, especially the in-well piezoelectric field Coulomb screening which tends to be saturated at high carrier concentrations, are discussed with optical power dependency. With the generated NAWs propagating in the c axis of a GaN thin film, the lifetime of the 500 GHz longitudinal-acoustic phonon pulses in GaN is measured to be longer than 420 ps, corresponding to a GaN depth more than 3.3 μm.

Published in:

Applied Physics Letters  (Volume:87 ,  Issue: 9 )

Date of Publication:

Aug 2005

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