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    Area of Science:

    • Acoustics
    • Materials Science
    • Physics

    Background:

    • Piezoelectric materials generate electric charge in response to mechanical stress.
    • Surface Acoustic Waves (SAWs) are mechanical waves that propagate along the surface of a solid material.
    • Controlling the motion of piezoelectric disks using acoustic waves is an area of interest for micro-device applications.

    Purpose of the Study:

    • To experimentally demonstrate the rotation of a piezoelectric disk using surface acoustic waves.
    • To investigate the effect of counter-propagating SAWs with different amplitudes on disk rotation.
    • To develop a transducer capable of generating these specific SAW conditions.

    Main Methods:

    • A flat piezoelectric disk, poled perpendicular to its surface, was suspended by a thin thread.
    • A nonsymmetrical interdigital transducer with varying electrode widths was fabricated on the disk surface.
    • Two surface acoustic waves (SAWs) with different amplitudes were excited in opposite directions.

    Main Results:

    • The piezoelectric disk was successfully rotated by approximately 50 degrees.
    • The rotation was achieved by the controlled excitation of counter-propagating SAWs with unequal amplitudes.
    • The specialized ring unidirectional transducer enabled the generation of the required SAW conditions.

    Conclusions:

    • The experimental setup effectively demonstrates controlled rotation of a piezoelectric disk using acoustic wave manipulation.
    • The design of the interdigital transducer is crucial for generating the differential amplitude counter-propagating SAWs necessary for rotation.
    • This technique offers a potential method for actuating micro-scale devices using acoustic energy.