Holographic Acoustic Tweezers can trap and manipulate multiple particles individually using acoustic radiationforces. This technology is similar to the well-established Holographic Optical Tweezers but presents some notabledierences. For instance, acoustic tweezers can operate on particles ranging from the micrometre to the centimetrescales. The particles can be made of a wide range of materials such as gases, liquids, metals, plastics or evenliving things. The propagation media can be air, water and does not need to be optically transparent, thereforemanipulations inside the human body from the exterior are a possibility. These unique features enable multipleapplications such as acoustophoretic displays in which several particles or one fast-moving particle form objectsin mid-air. On the other hand, tiny quirurgic instruments that are inserted in the body could be controlled notonly in position but also in orientation due to the multiple trapping point capabilities.
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