World's first frequency-multiplexed elastic metasurface: simultaneous mechanical vibration control/ separation at multiple frequencies

https://www.eurekalert.org/news-releases/1113974

"different frequencies need different devices, overcome by adjusting thin metal plate thickness (elastic wave phase sensitive to thickness of material it travels through) creating responses for different frequencies... single metasurface focused elastic 40 kHz, 60 kHz, 80 kHz onto spatial locations simultaneously. converting vibrations into electricity using piezoelectric elements, up to 48X higher signal intensities... combines wave control, frequency separation, spatial routing, electrical conversion"