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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-4568
DTSTART:20171012T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T003537Z
LAST-MODIFIED:20171003T152109Z
LOCATION:5310 Chamberlin Hall
SUMMARY:All-Dielectric Optical Metamaterials\, R. G. Herb Condensed Ma
 tter Seminar\, Jason Valentine \, Vanderbilt University
DESCRIPTION:<br>
\nOptical metamaterials are man-made materials in whi
 ch structuring is used to control the effective optical properties. Us
 ing the engineering freedom associated with structuring\, researchers 
 have utilized metamaterials for a number of exotic applications includ
 ing sub-diffraction limit imaging and cloaking. However\, absorption l
 oss has been a major impediment to the adoption of metamaterials in pr
 actical applications. This absorption loss arises due to ohmic damping
  in the metals that traditionally comprise the unit cell. In this talk
 \, I will discuss all-dielectric metamaterials in which metal\, and th
 e accompanying absorption\, is completely avoided. As with their metal
 lic counterparts\, manipulation of the unit cell structure of all-diel
 ectric metamaterials offers a means to engineer a wide variety of opti
 cal properties. Along these lines\, I will discuss several implementat
 ions of all-dielectric metasurfaces with functionalities that include 
 polarization control\, wavefront tailoring\, near-unity reflection\, a
 nd sharp Fano resonances. The freedom to achieve a wide variety of opt
 ical properties\, combined with the reduction in absorption loss\, cou
 ld lead to ultra-thin optical elements including lenses\, waveplates a
 nd sensors as well as more complex assemblies of these elements in the
  form of metaoptics.<br>
\n
URL:https://www.physics.wisc.edu/events/?id=4568
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