Topological phononic chip platform. a, Illustration of integrated devices that use topologically protected sound waves, including a phonon pump, an edge-waveguide, and an intensity modulator. b, Top: cross-section of the GaN-on-sapphire waveguide, showing its width (w) and thickness (h). Bottom: simulated vibration pattern of the main guided sound wave. c, Electron microscope image of the aluminum transducer used to generate 1.5 GHz phonons. d, Photo of the fabricated topological phononic chip. e, Diagram of the experimental setup, combining a custom optical vibrometer with a motorized stage to map how sound waves travel in the chip. Credit: Xu et al
Compact phononic circuits guide sound at gigahertz frequencies for chip-scale devices
Phononic circuits are emerging devices that can ...
Physics, Technology/Electronics 
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