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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-6920
DTSTART:20220506T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T195558Z
LAST-MODIFIED:20220408T164953Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Metasurfaces for Mid-Infrared Applications\, Thesis Defense\, 
 Gregory Holdman\, Physics PhD Graduate Student
DESCRIPTION:Metasurfaces are thin\, periodically patterned subwaveleng
 th strcuture that exhibit optical properties not present in their cons
 tituent materials. The modes and spectral features can be used for app
 lications often considered impossible with conventional optics such as
  perfect reflectivity\, strong mode confinement\, and other goals. In 
 this talk\, I will present work on two types of metasurfaces operating
  in the mid-infared. The first project studies the thermal stability o
 f a "laser sail"\, a metasurface designed to be both highly reflective
  and have low absorption. This sail could one day be used as a spacecr
 aft. With a GW-scale laser\, the radiation pressure could accelerate t
 he surface to a signicant fraction of the speed of light. The second p
 roject studies the possibility of integrating graphene into a metasurf
 ace exhibiting extremely narrow spectral features in order to modulate
  the frequency of the mode in situ. Such a device would find applicati
 ons in free-space optical communication and trace gas sensing.
URL:https://www.physics.wisc.edu/events/?id=6920
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