Nonlinear excitation of a rotational mode in a piezoelectrically excited square-extensional mode resonator

Lauri Lipiäinen, Antti Jaakkola, Kimmo Kokkonen, Matti Kaivola

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We present an experimental study of the nonlinear behavior of a square-extensional (SE) mode microelectromechanical resonator, actuated with a piezoelectric AlN thin film. The acoustic vibration fields of the device are characterized using laser probing. A nonlinear vibration behavior of the SE mode is observed above a drive power level of −10 dBm such that the vibration amplitude of the SE mode saturates and a rotational in-plane vibration mode is excited at a significantly lower frequency (0.725 MHz) than the SE mode (16.670 MHz). Interestingly, the measured ∼10 nm saturation amplitude of the SE mode is more than a decade below the amplitude value at which mechanical or electromechanical nonlinearities are estimated to become significant.
Original languageEnglish
Article number153508
JournalApplied Physics Letters
Issue number15
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed


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