Mechanical sound wave control by twisting 2 layers of metasurfaces patterned with microscopic pillars, at different angles relative to each other

https://www.eurekalert.org/news-releases/1101411

"switching between different topologies that govern wave direction to find magic angle focusing/ guiding sound vibration spread for faster, more efficient signal processing... greater broadband signal control across wide range of frequencies... enables quickly adjusted wave behavior, improving information transmission... facilitates the design of systems with greater resistance to glitches due to fabrication imperfections... sensing, communication, signal processing, ultrasound, microfluidics, chip-scale devices"