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Title: Broadband gradient impedance matching using an acoustic metamaterial for ultrasonic transducers
Authors: Li, Z
Yang, DQ
Liu, SL
Yu, SY
Lu, MH
Zhu, JE 
Zhang, ST
Zhu, MW
Guo, XS
Wu, HD
Wang, XL
Chen, YF
Issue Date: 2017
Publisher: Nature Publishing Group
Source: Scientific reports, 2017, v. 7, ARTN 42863 How to cite?
Journal: Scientific reports 
Abstract: High-quality broadband ultrasound transducers yield superior imaging performance in biomedical ultrasonography. However, proper design to perfectly bridge the energy between the active piezoelectric material and the target medium over the operating spectrum is still lacking. Here, we demonstrate a new anisotropic cone-structured acoustic metamaterial matching layer that acts as an inhomogeneous material with gradient acoustic impedance along the ultrasound propagation direction. When sandwiched between the piezoelectric material unit and the target medium, the acoustic metamaterial matching layer provides a broadband window to support extraordinary transmission of ultrasound over a wide frequency range. We fabricated the matching layer by etching the peeled silica optical fibre bundles with hydrofluoric acid solution. The experimental measurement of an ultrasound transducer equipped with this acoustic metamaterial matching layer shows that the corresponding -6 dB bandwidth is able to reach over 100%. This new material fully enables new high-end piezoelectric materials in the construction of high-performance ultrasound transducers and probes, leading to considerably improved resolutions in biomedical ultrasonography and compact harmonic imaging systems.
EISSN: 2045-2322
DOI: 10.1038/srep42863
Rights: © The Author(s) 2017
This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Li, Z., Yang, D. Q., Liu, S. L., Yu, S. Y., Lu, M. H., Zhu, J., ... & Wang, X. L. (2017). Broadband gradient impedance matching using an acoustic metamaterial for ultrasonic transducers. Scientific Reports, 7 is available at
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