Acoustic pressure is used to form silica gel microspheres and other materials into intricate 3D geometries. It’s not simple to pull that off. The researchers initially had to learn how to make intricate, layered holographic structures out of sound rather than light, which requires an enormous amount of processing power. “The digitalization of a whole 3D object into ultrasonic hologram fields is computationally quite hard,” one of the team’s researchers told FastCompany.
