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Surface acoustic wave (SAW) resonators are critical components in wirelesscommunications and many sensing applications. They have also recently emergedas subject of study in quantum acoustics at the single phonon level. Acousticloss reduction and mode confinement are key performance factors in SAWresonators. Here we report the design and experimental realization of a highquality factor Fabry-Perot SAW resonators formed in between tapered phononiccrystal mirrors patterned on a GaN-on-sapphire material platform . Thefabricated SAW resonators are characterized by both electrical network analyzerand optical heterodyne vibrometer. We observed standing Rayleigh wave insidethe cavity, with an intrinsic quality factor exceeding 13,000 at ambientconditions.

High Quality Factor Surface Fabry-Perot Cavity of Acoustic Waves