Holographic acoustic tweezers | Paper 3D printer

Paper: Holographic Acoustic Tweezers. PNAS. 2018. Asier Marzo, Bruce W. Drinkwater. Abstract: Acoustic Tweezers use sound radiation forces to manipulate matter without contact. They provide unique characteristics when compared to the more established Optical Tweezers, such as higher trapping forces per unit input power and the ability to manipulate objects from the micrometre to the centimetre scale. They also enable the trapping of a wide range of sample materials in various media. A dramatic advancement in Optical Tweezers was the development of Holographic Optical Tweezers (HOT) which enabled the independent manipulation of multiple particles leading to applications such as the assembly of 3D micro-structures and the probing of soft matter. Now, 20 years after the development of HOT, we present the first realization of Holographic Acoustic Tweezers (HAT). We experimentally demonstrate a 40 kHz airborne HAT system implemented using two 25