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A thickness-mode piezoelectric micromachined ultrasound transducer annular array using a PMN-PZT single crystal

Title
A thickness-mode piezoelectric micromachined ultrasound transducer annular array using a PMN-PZT single crystal
Authors
Kang, Woo JinJung, Joon TaekLee, Won JunRyu, JunghoChoi, Hong Soo
DGIST Authors
Choi, Hong Soo
Issue Date
2018-07
Citation
Journal of Micromechanics and Microengineering, 28(7)
Type
Article
Article Type
Article
Keywords
Annular ArrayBehaviorEffective Electro-Mechanical Coupling CoefficientsElectromechanical CouplingEtching CharacteristicsFabricationFerroelectric CeramicsFilmsHigh-FrequencyInductively Coupled PlasmaInductively Coupled-Plasma Reactive Ion EtchingLead Magnesium Niobate-Lead Zirconate TitanateLead Zirconate TitanateMagnesium CompoundsMechanismMEMSMicro electromechanical system (MEMS)Niobium CompoundsPerformancePhotoelectron-Spectrapiezoelectric MEMSPiezoelectric TransducersPiezoelectricityPMN-PZTPMN-PZT single crystalpMUTReactive Ion EtchingSingle CrystalsThinTransducersUltrasonic Transducer
ISSN
0960-1317
Abstract
Micro-electromechanical system (MEMS) technologies were used to develop a thickness-mode piezoelectric micromachined ultrasonic transducer (Tm-pMUT) annular array utilizing a lead magnesium niobate-lead zirconate titanate (PMN-PZT) single crystal prepared by the solid-state single-crystal-growth method. Dicing is a conventional processing method for PMN-PZT single crystals, but MEMS technology can be adopted for the development of Tm-pMUT annular arrays and has various advantages, including fabrication reliability, repeatability, and a curved element shape. An inductively coupled plasma-reactive ion etching process was used to etch a brittle PMN-PZT single crystal selectively. Using this process, eight ring-shaped elements were realized in an area of 1 × 1 cm2. The resonance frequency and effective electromechanical coupling coefficient of the Tm-pMUT annular array were 2.66 (±0.04) MHz, 3.18 (±0.03) MHz, and 30.05%, respectively, in the air. The maximum positive acoustic pressure in water, measured at a distance of 7.27 mm, was 40 kPa from the Tm-pMUT annular array driven by a 10 Vpp sine wave at 2.66 MHz without beamforming. The proposed Tm-pMUT annular array using a PMN-PZT single crystal has the potential for various applications, such as a fingerprint sensor, and for ultrasonic cell stimulation and low-intensity tissue stimulation. © 2018 IOP Publishing Ltd.
URI
http://hdl.handle.net/20.500.11750/6390
DOI
10.1088/1361-6439/aab9d4
Publisher
Institute of Physics Publishing
Related Researcher
Files:
There are no files associated with this item.
Collection:
Department of Robotics EngineeringBio-Micro Robotics Lab1. Journal Articles


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