Phys.org  August 18, 2021 Despite all its potential, the acoustic tweezer technology makes it difficult to manipulate particles independently of one another or through complex patterns. To overcome the limitation of the acoustic tweezer a team of researchers in the US (Duke University, Rowan University) has demonstrated spatially complex particle trapping and manipulation inside a boundary-free chamber using a single pair of sources and an engineered structure outside the chamber that they call a shadow waveguide. The shadow waveguide creates a tightly confined, spatially complex acoustic field inside the chamber without requiring any interior structure that would interfere with net […]