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Ultrasonics. 2012 Jan;52(1):1-4. doi: 10.1016/j.ultras.2011.07.007. Epub 2011 Aug 6.

Broadband terahertz ultrasonic transducer based on a laser-driven piezoelectric semiconductor superlattice.

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Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.


Spectral characteristics of laser-generated acoustic waves in an InGaN/GaN superlattice structure are studied at room temperature. Acoustic vibrations in the structure are excited with a femtosecond laser pulse and detected via transmission of a delayed probe pulse. Seven acoustic modes of the superlattice are detected, with frequencies spanning a range from 0.36 to 2.5THz. Acoustic waves up to ∼2THz in frequency are not significantly attenuated within the transducer which indicates excellent interface quality of the superlattice. The findings hold promise for broadband THz acoustic spectroscopy.

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