![]() ![]() 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%. We fabricated the matching layer by etching the peeled silica optical fibre bundles with hydrofluoric acid solution. 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. 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. However, proper design to perfectly bridge the energy between the active piezoelectric material and the target medium over the operating spectrum is still lacking. High-quality broadband ultrasound transducers yield superior imaging performance in biomedical ultrasonography. Li, Zheng Yang, Dan-Qing Liu, Shi-Lei Yu, Si-Yuan Lu, Ming-Hui Zhu, Jie Zhang, Shan-Tao Zhu, Ming-Wei Guo, Xia-Sheng Wu, Hao-Dong Wang, Xin-Long Chen, Yan-Feng ![]() Broadband gradient impedance matching using an acoustic metamaterial for ultrasonic transducers ![]()
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May 2023
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