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

Zaman, Abdullah and Degl'Innocenti, Riccardo and Lu, Yuezhen and Almond, Nikita and Burton, Oliver J. and Alexander-Webber, Jack and Hofmann, Stephan and Mitchell, Thomas and Griffiths, Jonathan D. P. and Beere, Harvey E. and Ritchie, David (2023) Versatile and Active THz Wave Polarization Modulators Using Metamaterial/graphene Resonators. Frontiers in Nanotechnology Section Nanophotonics, 5: 1057422.

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Frontiers in Nanotechnology Section Nanophotonics
Uncontrolled Keywords:
Research Output Funding/yes_externally_funded
Subjects:
?? terahertz,metamaterialsgraphenewireless communicationsintegrated modulatorsyes - externally fundedyes ??
ID Code:
185825
Deposited By:
Deposited On:
10 Feb 2023 16:20
Refereed?:
Yes
Published?:
Published
Last Modified:
01 May 2024 00:22