@article{892da4acd047418088925c568bbf9def,
title = "Broadband terahertz ultrasonic transducer based on a laser-driven piezoelectric semiconductor superlattice",
abstract = "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.",
keywords = "Laser-generated acoustic waves, Semiconductor superlattices, Terahertz acoustics, Ultrasonic transducers",
author = "Maznev, {A. A.} and Manke, {Kara J.} and Lin, {Kung Hsuan} and Nelson, {Keith A.} and Sun, {Chi Kuang} and Chyi, {Jen Inn}",
note = "Funding Information: This work was supported as part of the S3TEC Energy Frontier Research Center funded by the US Department of Energy (DOE) , Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001299 (A.A.M.) and by DOE Grant DE-FG02-00ER15087 (K.J.M., K.-H.L. and the experimental setup). K.J.M. acknowledges support from a National Science Foundation Graduate Research Fellowship. The authors would like to thank Dr. Christoph Klieber for his contribution to the measurement setup. ",
year = "2012",
month = jan,
doi = "10.1016/j.ultras.2011.07.007",
language = "???core.languages.en_GB???",
volume = "52",
pages = "1--4",
journal = "Ultrasonics",
issn = "0041-624X",
number = "1",
}