title: Bandwidth improvement of LiNbO3 ultrasonic transducers by half-concaved inversion layer approach.
abstract: A novel type of half-concaved LiNbO(3) plate with domain inversion layer has been proposed for fabricating high-frequency broadband ultrasonic transducers. Two opposite ferroelectric polarization layers with a curved boundary are presented after heat treatment in the half-concaved LiNbO(3) plate with a total thickness of 110 μm. Characterization of the transducers illustrates that, without a matching layer, the self-focusing transducer with the half-concaved LiNbO(3) plate has achieved 123% bandwidth at the center frequency of 60 MHz, which is a significant improvement over the planar inversion layer transducer.
authors.affiliation: Department of Precision Instrument and Mechanology, Tsinghua University, Beijing 10084, China.
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: J Y
authors.initials: JY
authors.lastname: Dai
authors.forename: C
authors.initials: C
authors.lastname: Zhang
authors.forename: Z T
authors.initials: ZT
authors.lastname: Zhang
authors.forename: G P
authors.initials: GP
authors.lastname: Feng