Asymmetric acoustic radiation in leaky SAW resonators on lithium tantalate

We discuss an acoustic loss mechanism in leaky surface-acoustic wave resonators on 36°YX-cut lithium tantalate substrate. Our recent acoustic field scans performed with an optical Michelson interferometer revealed a spatially asymmetric acoustic field atop the busbars of a resonator, giving rise to...

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Bibliographic Details
Main Authors: Knuuttila, J. V., Koskela, J., Tikka, P. T., Salomaa, M. M., Hartmann, C. S., Plessky, V. P.
Format: Conference Proceeding
Language:English
Subjects:
Acoustic waves
Crystallization
Geometrical optics
Interferometric lithography
Lithium compounds
Optical interferometry
Optical losses
Optical resonators
Optical surface waves
Surface acoustic waves
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Summary:We discuss an acoustic loss mechanism in leaky surface-acoustic wave resonators on 36°YX-cut lithium tantalate substrate. Our recent acoustic field scans performed with an optical Michelson interferometer revealed a spatially asymmetric acoustic field atop the busbars of a resonator, giving rise to acoustic beams which escape the resonator area and lead to undesired losses. Here, we link the phenomenon with the inherent crystalline anisotropy of the substrate crystal: the shape of the slowness curves and the asymmetry of the polarization for the leaky surface-acoustic waves propagating at an angle with respect to the crystal X-axis.
ISSN:1051-0117
DOI:10.1109/ULTSYM.1999.849361