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BEGIN:VEVENT
DTSTAMP:20260525T161816Z
DTSTART;VALUE=DATE-TIME:20231025T161500
DTEND;VALUE=DATE-TIME:20231025T173500
SUMMARY:Bruce Drinkwater (Bristol): Acoustic beams – from tractors to art
 ificial muscle via metasurfaces
TZID:Europe/London
UID:20231025-8a1785d78af57469018b05b125bc34b9@warwick.ac.uk
CREATED:20231018T203711Z
DESCRIPTION:Professor Bruce Drinkwater (University of Bristol) Abstract: 
 Acoustic (or ultrasonic) beams are used widely in engineering\, science 
 and medicine. Beams are integral to medical and non-destructive testing 
 imaging systems where the focal spot size determines resolution. However
 \, these beams can become distorted\, e.g.\, when propagating through po
 lycrystalline metals or across the skull into the brain. Beams are also 
 key to techniques that use the acoustic radiation force to transfer mome
 ntum to manipulate objects\, i.e.\, acoustical tweezers or tractor beams
 . Here the beams must be carefully shaped to create the correct local fo
 rce field. This talk first describes the properties of acoustic beams\, 
 how they are distorted and how this can be corrected. The various experi
 mental techniques for the creation of beams are then explored. Acoustic 
 holograms and metasurfaces lead to particularly exquisite control of bea
 m shape yet are currently static. Arrays of individual emitters can prov
 ide dynamic beam control but are currently lower in resolution. In this 
 talk these approaches are explained and example devices introduced. Thro
 ughout the talk the various applications of acoustic beams are highlight
 ed including both imaging and biomedical manipulation. The latter has en
 abled the creation of artificial tissues such as muscle.
LOCATION:PLT
CATEGORIES:Departmental Colloquium
LAST-MODIFIED:20231018T203711Z
ORGANIZER;CN=Valery Nakariakov:
END:VEVENT
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