Measurement of evanescent wave properties of a bulk acoustic wave resonator: Letters

K. Kokkonen, Johanna Meltaus, Tuomas Pensala, M. Kaivola

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)

    Abstract

    Acoustic wave fields in a thin-film bulk acoustic wave resonator are studied using a heterodyne laser interferometer. The measurement area is extended outside the active electrode region of the resonator, so that wave fields in both the active and surrounding regions can be characterized. At frequencies at which the region surrounding the resonator does not support laterally propagating acoustic waves, the analysis of the measurement data shows exponentially decaying amplitude fields outside the active resonator area, as suggested by theory. The magnitude of the imaginary wave vectors is determined by fitting an exponential function to the measured amplitude data, and thereby the experimentally determined dispersion diagram is extended into the region of imaginary wave numbers.
    Original languageEnglish
    Pages (from-to)557-559
    Number of pages3
    JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    Volume59
    Issue number3
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Acoustic measurements
    • acoustic waves
    • dispersion
    • optical resonators
    • optical surface waves
    • resonant frequency

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