Broadband terahertz ultrasonic transducer based on a laser-driven piezoelectric semiconductor superlattice
Broadband terahertz ultrasonic transducer based on a laser-driven piezoelectric semiconductor superlattice
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DOI：
10.1016/j.ultras.2011.07.007
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发表时间：
2012-01-01
期刊：
影响因子：
4.2
通讯作者：
Chyi, Jen-Inn
中科院分区：
文献类型：
--
作者：
Maznev, A. A.;Manke, Kara J.;Chyi, Jen-Inn
研究了室温下InGaN/GaN超晶格结构中激光声波的光谱特性。结构中的声振动由飞秒激光脉冲激发，并通过延迟探测脉冲的传输来检测。超晶格的七种声学模式被检测到，频率范围从0.36到2.5太赫兹。频率高达2太赫兹的声波在换能器内没有明显衰减，这表明超晶格的界面质量很好。这一发现为宽带太赫兹声谱学带来了希望。(C) 2011 Elsevier B.V.版权所有
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 similar 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. (C) 2011 Elsevier B.V. All rights reserved.