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Optical piezoelectric transducer for nano-ultrasonics
K.-H. Li1; C.-T. Y1; T.-M. Liu1; G.-W. Cher2; G.-T. Che3; C.-C. Pan3; C.-I. Chyi3; S.-W. Huan4; P.-C. L4; C.-K. Su4
Source Publicationieee transactions on ultrasonics, ferroelectrics, and frequency control

Piezoelectric semiconductor strained layers can be treated as piezoelectric transducers to generate nanometer-wavelength and THz-frequency acoustic waves. The mechanism of nano-acoustic wave (NAW) generation in strained piezoelectric layers, induced by femtosecond optical pulses, can be modeled by a macroscopic elastic continuum theory. The optical absorption change of the strained layers modulated by NAW through quantum-confined Franz-Keldysh (QCFK) effects allows optical detection of the propagating NAW. Based on these piezoelectric-based optical principles, we have designed an optical piezoelectric transducer (OPT) to generate NAW. The optically generated NAW is then applied to one-dimensional (1-D) ultrasonic scan for thickness measurement, which is the first step toward multidimensional nano-ultrasonic imaging. By launching a NAW pulse and resolving the returned acoustic echo signal with femtosecond optical pulses, the thickness of the studied layer can be measured with 1 nm resolution. This nano-structured OPT technique will provide the key toward the realization of nano-ultrasonics, which is analogous to the typical ultrasonic techniques but in a nanometer scale

Indexed BySCI
WOS Research AreaAcoustics ; Engineering
WOS SubjectAcoustics ; Engineering, Electrical & Electronic
WOS IDWOS:000231636700022
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Cited Times [WOS]:24   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionFaculty of Health Sciences
Affiliation1.Graduate Institute of Electro-Optical Engineering, National Taiwan University, Taipei 10617, Taiwan
2.Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218
3.Department of Electrical Engineering, National Central University, Chung-Li 32045, Taiwan
4.Department of Electrical Engineer4
Recommended Citation
GB/T 7714
K.-H. Li,C.-T. Y,T.-M. Liu,et al. Optical piezoelectric transducer for nano-ultrasonics[J]. ieee transactions on ultrasonics, ferroelectrics, and frequency control,2005,52(8).
APA K.-H. Li.,C.-T. Y.,T.-M. Liu.,G.-W. Cher.,G.-T. Che.,...&C.-K. Su.(2005).Optical piezoelectric transducer for transactions on ultrasonics, ferroelectrics, and frequency control,52(8).
MLA K.-H. Li,et al."Optical piezoelectric transducer for nano-ultrasonics".ieee transactions on ultrasonics, ferroelectrics, and frequency control 52.8(2005).
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