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- W4378718327 abstract "Guiding and manipulating GHz frequency acoustic waves in $mu$m-scale waveguides and resonators opens up new degrees of freedom to manipulate radio frequency (RF) signals in chip-scale platforms. A critical requirement for enabling high-performance devices is the demonstration of low acoustic dissipation in these highly confined geometries. In this work, we show that gallium nitride (GaN) on silicon carbide (SiC) supports low-loss acoustics by demonstrating acoustic microring resonators with frequency-quality factor ($fQ$) products approaching $4*10^{13}$ Hz at 3.4 GHz. The low dissipation measured exceeds the $fQ$ bound set by the simplified isotropic Akhiezer material damping limit of GaN. We use this low-loss acoustics platform to demonstrate spiral delay lines with on-chip RF delays exceeding 2.5 $mu$s, corresponding to an equivalent electromagnetic delay of $approx$ 750 m. Given GaN is a well-established semiconductor with high electron mobility, our work opens up the prospect of engineering traveling wave acoustoelectric interactions in $mu$m-scale waveguide geometries, with associated implications for chip-scale RF signal processing." @default.
- W4378718327 created "2023-05-30" @default.
- W4378718327 creator A5004316060 @default.
- W4378718327 creator A5046668884 @default.
- W4378718327 date "2023-05-26" @default.
- W4378718327 modified "2023-09-27" @default.
- W4378718327 title "Low-loss GHz frequency phononic integrated circuits in Gallium Nitride for compact radio-frequency acoustic wave devices" @default.
- W4378718327 doi "https://doi.org/10.48550/arxiv.2305.16961" @default.
- W4378718327 hasPublicationYear "2023" @default.
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