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Versatile and Active THz Wave Polarization Modulators Using Metamaterial/graphene Resonators

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  • Abdullah Zaman
  • Riccardo Degl'Innocenti
  • Yuezhen Lu
  • Nikita Almond
  • Oliver J. Burton
  • Jack Alexander-Webber
  • Stephan Hofmann
  • Thomas Mitchell
  • Jonathan D. P. Griffiths
  • Harvey E. Beere
  • David Ritchie
Article number1057422
<mark>Journal publication date</mark>31/01/2023
<mark>Journal</mark>Frontiers in Nanotechnology Section Nanophotonics
Number of pages11
Publication StatusPublished
Early online date31/01/23
<mark>Original language</mark>English


Active modification of the polarization state is a key feature for the next-generation of wireless communications, sensing, and imaging in the THz band. The polarization modulation performance of an integrated metamaterial/graphene device is investigated via a modified THz time domain spectroscopic system. Graphene’s Fermi level is modified through electrostatic gating, thus modifying the device’s overall optical response. Active tuning of ellipticity by >0.3 is reported at the resonant frequency of 0.80 THz. The optical activity of transmitted THz radiations is continuously modified by > 21.5deg at 0.71 THz. By carefully selecting the transmitted frequency with the relative angle between the incoming linear polarization and the device’s symmetry axis, active circular dichroism and optical activity are almost independently exploited. Finally, this all-electronically tuneable versatile polarization device can be used in all applications requiring an ultrafast modulation such as polarization spectroscopy, imaging, and THz wireless generation.