ZnO film thickness effect on surface acoustic wave modes and acoustic streaming

X.Y. Du, Yong Qing Fu, S. C. Tan, Jikui Luo, Andrew Flewitt, William Milne, Dae-Sik Lee, Nae-Man Park, J. Park, Youngjin Choi, Sang Hyeob Kim, Sunglyul Maeng

Research output: Contribution to journalArticlepeer-review

102 Citations (Scopus)

Abstract

Surface acoustic wave(SAW) devices were fabricated on ZnO thin films deposited on Si substrates. Effects of ZnOfilm thickness on the wave mode and resonant frequency of the SAWs have been investigated. Rayleigh and Sezawa waves were detected, and their resonant frequencies decrease with increase in film thickness. The Sezawa wave has much higher acoustic velocity and larger signal amplitude than those of Rayleigh mode wave.Acoustic streaming for mixing has been realized in piezoelectric thin filmSAWs. The Sezawa wave has a much better efficiency in streaming, and thus is very promising for application in microfluidics.
Original languageEnglish
Pages (from-to)094105
JournalApplied Physics Letters
Volume93
Issue number9
DOIs
Publication statusPublished - 2008

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