title: Design of matching layers for high-frequency ultrasonic transducers.
abstract: Matching the acoustic impedance of high-frequency (≥100 MHz) ultrasound transducers to an aqueous loading medium remains a challenge for fabricating high-frequency transducers. The traditional matching layer design has been problematic to establish high matching performance given requirements on both specific acoustic impedance and precise thickness. Based on both mass-spring scheme and microwave matching network analysis, we interfaced metal-polymer layers for the matching effects. Both methods hold promises for guiding the metal-polymer matching layer design. A 100 MHz LiNbO3transducer was fabricated to validate the performance of the both matching layer designs. In the pulse-echo experiment, the transducer echo amplitude increased by 84.4% and its -6dB bandwidth increased from 30.2% to 58.3% comparing to the non-matched condition, demonstrating that the matching layer design method is effective for developing high-frequency ultrasonic transducers.
authors.forename: Chunlong
authors.initials: C
authors.lastname: Fei
authors.forename: Jianguo
authors.initials: J
authors.lastname: Ma
authors.affiliation: NIH Resource Center for Medical Ultrasonic Transducer Technology and Department of Biomedical Engineering, University of Southern California , Los Angeles, California 90089, USA.
authors.forename: Chi Tat
authors.initials: CT
authors.lastname: Chiu
authors.affiliation: NIH Resource Center for Medical Ultrasonic Transducer Technology and Department of Biomedical Engineering, University of Southern California , Los Angeles, California 90089, USA.
authors.forename: Jay A
authors.initials: JA
authors.lastname: Williams
authors.affiliation: NIH Resource Center for Medical Ultrasonic Transducer Technology and Department of Biomedical Engineering, University of Southern California , Los Angeles, California 90089, USA.
authors.forename: Wayne
authors.initials: W
authors.lastname: Fong
authors.affiliation: NIH Resource Center for Medical Ultrasonic Transducer Technology and Department of Biomedical Engineering, University of Southern California , Los Angeles, California 90089, USA.
authors.forename: Zeyu
authors.initials: Z
authors.lastname: Chen
authors.affiliation: NIH Resource Center for Medical Ultrasonic Transducer Technology and Department of Biomedical Engineering, University of Southern California , Los Angeles, California 90089, USA.
authors.forename: BenPeng
authors.initials: B
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University , Wuhan 430072, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Xiong
authors.affiliation: Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University , Wuhan 430072, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Shi
authors.forename: Tzung K
authors.initials: TK
authors.lastname: Hsiai
authors.affiliation: NIH Resource Center for Medical Ultrasonic Transducer Technology and Department of Biomedical Engineering, University of Southern California , Los Angeles, California 90089, USA.
authors.forename: K Kirk
authors.initials: KK
authors.lastname: Shung
authors.affiliation: NIH Resource Center for Medical Ultrasonic Transducer Technology and Department of Biomedical Engineering, University of Southern California , Los Angeles, California 90089, USA.
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhou