‘Shadow waveguide’ casts complex acoustic patterns to control particles

Engineers have devised a new approach to using sound waves to conduct complex manipulations of tiny particles suspended in liquid. Dubbed a 'shadow waveguide,' the technique uses only two sound sources to create a tightly confined, spatially complex acoustic field inside a chamber without requiring any interior structure. The technology offers acoustic tweezers abilities with applications in fields such as chemical reaction control, micro-robotics, drug delivery, and cell and tissue engineering.

from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/08/210818153650.htm