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Proceedings Paper

Nano-ultrasonics: science and technology
Author(s): 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
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Paper Abstract

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 MQW's modulated by NAW's 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.

Paper Details

Date Published: 16 June 2004
PDF: 9 pages
Proc. SPIE 5352, Ultrafast Phenomena in Semiconductors and Nanostructure Materials VIII, (16 June 2004); doi: 10.1117/12.528182
Show Author Affiliations
Kung-Hsuan Lin, National Taiwan Univ. (Taiwan)
Chia-Lung Hsieh, National Taiwan Univ. (Taiwan)
Tzu-Ming Liu, National Taiwan Univ. (Taiwan)
Stacia Keller, Univ. of California/Santa Barbara (United States)
Steven P. DenBaars, Univ. of California/Santa Barbara (United States)
Guan-Ting Chen, National Central Univ. (Taiwan)
Chang-Chi Pan, National Central Univ. (Taiwan)
Jen-Inn Chyi, National Central Univ. (Taiwan)
Chi-Kuang Sun, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5352:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials VIII
Kong-Thon Tsen; Jin-Joo Song; Hongxing Jiang, Editor(s)

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