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2015 ; 6
(ä): 8661
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Holographic acoustic elements for manipulation of levitated objects
#MMPMID26505138
Marzo A
; Seah SA
; Drinkwater BW
; Sahoo DR
; Long B
; Subramanian S
Nat Commun
2015[Oct]; 6
(ä): 8661
PMID26505138
show ga
Sound can levitate objects of different sizes and materials through air, water
and tissue. This allows us to manipulate cells, liquids, compounds or living
things without touching or contaminating them. However, acoustic levitation has
required the targets to be enclosed with acoustic elements or had limited
manoeuvrability. Here we optimize the phases used to drive an ultrasonic phased
array and show that acoustic levitation can be employed to translate, rotate and
manipulate particles using even a single-sided emitter. Furthermore, we introduce
the holographic acoustic elements framework that permits the rapid generation of
traps and provides a bridge between optical and acoustical trapping. Acoustic
structures shaped as tweezers, twisters or bottles emerge as the optimum
mechanisms for tractor beams or containerless transportation. Single-beam
levitation could manipulate particles inside our body for applications in
targeted drug delivery or acoustically controlled micro-machines that do not
interfere with magnetic resonance imaging.