Abstract
We previously reported three-dimensional acoustic manipulation. Two opposite ultrasonic phased arrays generate a localized standing wave at an arbitrary position in midair. Submillimeter-sized particles are suspended in the nodes of the standing wave and moved by gradually changing the position of the standing wave. It turned out that the unbalance of the conditions of the ultrasonic phased arrays causes the drift of the standing wave and the particles drop off at the end of the standing wave. In this paper, a standing wave is generated by a single array with a reflection plate. This configuration enables more stable manipulation in the directions parallel to the reflection plate.
