Generation of frequency-tunable nanoacoustic waves by optical coherent control

Cheng Ta Yu, Kung Hsuan Lin, Chia Lung Hsieh, Chang Chi Pan, Jen Inn Chyi, Chi Kuang Sun

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26 Scopus citations


We have developed a system to generate arbitrary wave-form nanoacoustic waves (NAWs) with a piezoelectric InGaNGaN 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.

Original languageEnglish
Article number093114
JournalApplied Physics Letters
Issue number9
StatePublished - 29 Aug 2005


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