Nano ultrasonics: Science and technology

Kung Hsuan Lin, Chia Lung Hsieh, Tzu Ming Liu, Stacia Keller, Steven P. DenBaars, Guan Ting Chen, Chang Chi Pan, Jen Inn Chyi, Chi Kuang Sun

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Multiple quantum well (MQW) structure piezoelectric semiconductor can be treated as a piezoelectric transducer to generate nanometer wavelength and THz frequency acoustic waves. The generation mechanism of nano acoustic wave (NAW) in quantum wells induced by femtosecond optical pulses can be modeled by a macroscopic elastic continuum theory. The absorption of the MQWs modulated by NAWs through quantum confined Franz-Keldysh (QCFK) effect allows another femtosecond optical probe pulses to monitor the propagating NAW. Many applications in typical ultrasonics can be achieved by NAWs. The simultaneous waveform synthesis is demonstrated by an optical coherent control technique. The phase of the totally reflected NAW is studied. Acoustic coherent control can be achieved by designing the thickness of the cap layer on the MQW. We also demonstrated the feasibility to apply THz NAWs to acoustically control an electronic device with higher operation speed and spatial accuracy. Seismology, which is the first step toward ultrasonic imaging, was also demonstrated. The arrival time of the echo is obtained by processing the transient transmission changes of the probe. Ultrafast technique and nano technology are ready for nano ultrasonics.

Original languageEnglish
Pages (from-to)101-109
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2004
EventUltrafast Phenomena in Semiconductors and Nanostructure Materials VIII - San Jose, CA, United States
Duration: 26 Jan 200429 Jan 2004


  • Coherent Acoustic Phonons
  • InGaN/GaN MQWs
  • Nano Acoustiewave
  • Nano Ultrasonics
  • Nanoseismology
  • Piezoelectric Transducer
  • Pump Probe


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