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

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Title:	Broadband terahertz ultrasonic transducer based on a laser-driven piezoelectric semiconductor superlattice
Authors:	綦振瀛;Maznev, A.A.;Manke, Kara J.;Lin, Kung-Hsuan;Nelson, Keith A.;Sun, Chi-Kuang;Chyi, Jen-Inn
Contributors:	資訊電機學院電機工程學系
Keywords:	Acoustics;Attenuation;Broadband;Exact sciences and technology;Femtosecond;Fundamental areas of phenomenology (including applications);Indium gallium nitrides;Laser-generated acoustic waves;Linear acoustics;Physics;Semiconductor superlattices;Semiconductors;solar (photovoltaic), solar (thermal), solid state lighting, phonons, thermal conductivity, thermoelectric, defects, mechanical behavior, charge transport, spin dynamics, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing);sounds;spectral analysis;spectroscopy;Structural acoustics and vibration;Superlattices;temperature;Terahertz acoustics;Transducers;transducers (equipment);Transduction;acoustical devices for the generation and reproduction of sound;Ultrasonic transducers
Date:	2012-01-01
Issue Date:	2026-04-23 13:37:01 (UTC+8)
Publisher:	Amsterdam: Elsevier B.V
Abstract:	摘要： ► We are aiming to extend acoustic spectroscopy across the whole Brillouin zone. ► Femtosecond laser pulses excite multiple acoustic modes of a 10-period InGaN/GaN superlattice. ► Seven modes spanning a range from 0.36 to 2.5 THz are detected. ► Acoustic waves up to ∼2 THz are not significantly attenuated within the superlattice. 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 2.5 THz. Acoustic waves up to ∼2 THz 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. 其他題名： Ultrasonics 出版者： Amsterdam: Elsevier B.V 出版日期： 2012 出處： Ultrasonics, 2012, Vol.52 (1), p.1-4 版權： 2011 Elsevier B.V. 版權： 2015 INIST-CNRS 版權： Copyright © 2011 Elsevier B.V. All rights reserved. 識別號： ISSN: 0041-624X 識別號： ISSN: 1874-9968 識別號： EISSN: 1874-9968 識別號： DOI: 10.1016/j.ultras.2011.07.007 識別號： PMID: 21872899 識別號： CODEN: ULTRA3
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