Significant Enhancement in Operational Bandwidth of ZnO PMUTs due to the Simultaneous Existence of Softening and Hardening Nonlinearity

Kumar, R and Tiwari, S and Pratap, R (2020) Significant Enhancement in Operational Bandwidth of ZnO PMUTs due to the Simultaneous Existence of Softening and Hardening Nonlinearity. In: IEEE International Ultrasonics Symposium, IUS, 7-11 September 2020, Las Vegas; United States.

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Abstract

This paper reports the first experimental observation of mixed nonlinearity (softening followed by hardening) in ZnO based PMUTs and their exploitation for enhancing the bandwidth of the transducer. These experiments are conducted on PMUTs fabricated with nanostructured ZnO thin film as the active piezoelectric material. The mixed nonlinearities in peak response are observed at relatively low actuation voltage of 1-6 V AC. We show that the intrinsic jump phenomenon embedded in this kind of nonlinear response can be effectively used to enhance the operational bandwidth of the PMUT by actuating the device with an appropriate voltage commensurate with the branch of nonlinearity one wishes to target. We report a bandwidth enhancement of up to 33 times using this technique. © 2020 IEEE.

Item Type:	Conference Paper
Publication:	IEEE International Ultrasonics Symposium, IUS
Publisher:	IEEE Computer Society
Additional Information:	cited By 0; Conference of 2020 IEEE International Ultrasonics Symposium, IUS 2020 ; Conference Date: 7 September 2020 Through 11 September 2020; Conference Code:165031
Keywords:	Hardening; II-VI semiconductors; Oxide minerals; Zinc oxide, Bandwidth enhancement; Jump phenomenon; Low actuation voltage; Nanostructured ZnO; Non-linear response; Operational bandwidth; Peak response, Bandwidth
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	11 Feb 2021 07:03
Last Modified:	11 Feb 2021 07:03
URI:	http://eprints.iisc.ac.in/id/eprint/67536

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