Broadband gradient impedance matching using an acoustic metamaterial for ultrasonic transducers.

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 wit

SUBMITTER: Li Z 

PROVIDER: S-EPMC5314352 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature