BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Active THz Polarization Modulators - Stephen Kindness\, University
  of Cambridge
DTSTART:20181031T140000Z
DTEND:20181031T150000Z
UID:TALK114244@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:With the progress of Terahertz (THz) technologies in recent ye
 ars\, a wide range of applications have emerged including material charact
 erization\, gas sensing\, biomedical imaging and communication. Fast activ
 e control over the properties of Terahertz radiation is essential for all 
 these applications\, including the controllable modulation of the phase\, 
 amplitude and polarization of Terahertz radiation. \n     I will be discus
 sing all electrical devices which have been successfully designed and fabr
 icated in the THz group which can be used to actively control the polariza
 tion of transmitted THz radiation\, with potential modulation speeds in th
 e order of 100 KHz.  These devices manipulate the polarization condition o
 f transmitted radiation by combing chiral metamaterial arrays with electri
 cally tuneable graphene for active polarization modulation. Active control
  of the conversion from linear polarized radiation to circular polarized r
 adiation is demonstrated\, and the rotation of linear polarized radiation 
 by around 20 degrees is also achieved\, dependant on the frequency of the 
 incident THz radiation and the applied backgate voltage. \n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
END:VEVENT
END:VCALENDAR