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SUMMARY:Moving objects in a scattering medium: a wavefront-shaping approac
 h - Romain Fleury (EPFL - Ecole Polytechnique Fédérale de Lausanne)
DTSTART:20230526T103500Z
DTEND:20230526T112000Z
UID:TALK198946@talks.cam.ac.uk
DESCRIPTION:We present an approach to optimally move a specific scatterer 
 in a multiple scattering medium\, by pushing it using engineered wavefront
 s to guide it along a pre-defined trajectory. This is particularly challen
 ging when the object to be moved modifies significantly the speckle field 
 as it moves\, or in other words\, when it does not scatter much more than 
 the other particles in the medium. Our method is based on real-time far-fi
 eld measurements that allow us to determine the optimal wavefront to push 
 the object in a given direction. A proof-of-concept experiment using audib
 le sound will be presented\, demonstrating the use of the method to push o
 r rotate a floating object in a parallel plate acoustic waveguide. A concl
 usion will be given about the possible extension of the concept to ultraso
 nic frequencies and applications in biological tweezer for micromanipulati
 on in scattering and even time-dependent media
LOCATION:Seminar Room 1\, Newton Institute
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