Surface acoustic wave phonon laser wireless technology makes devices like smartphones smaller, faster, and more energy-efficient

https://www.eurekalert.org/news-releases/1112196

"microscopic vibrations that travel across material's top layer, in smartphones concentrated photon beam converts RF into vibrations filtering out signal noise before converting back into RF... now, concentrated phonon (acoustic) wave instead... piezoelectric stack of silicon/ lithium niobate, and indium gallium arsenide... electric current accelerates electrons which interact with lithium niobate vibrations bouncing between reflectors, gaining strength forming wave... battery powered single chip, 1 GHz scalable to 100s"

Related: Quantum researchers engineer extremely precise phonon lasers
https://www.eurekalert.org/news-releases/1121803