Versatile and active THz wave polarization modulators using metamaterial/graphene resonators

Frontiers in Nanotechnology

Nanotechnology

Nikita W. Almond¹  David A. Ritchie¹  Harvey E. Beere¹  Jonathan D. P. Griffiths¹  Thomas Mitchell¹  Stephan Hofmann²  Oliver J. Burton²  Jack Alexander-Webber²  Riccardo Degl’Innocenti³  Yuezhen Lu³  Abdullah M. Zaman⁴ 

[1] Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom;Department of Engineering, University of Cambridge, Cambridge, United Kingdom;School of Engineering, Lancaster University, Bailrigg, Lancaster, United Kingdom;School of Engineering, Lancaster University, Bailrigg, Lancaster, United Kingdom;College of Engineering, Taibah University, Madina, Saudi Arabia;

关键词: terahertz;    metamaterials;    graphene;    wireless communications;    integrated modulators;   

DOI  :  10.3389/fnano.2023.1057422

 received in 2022-09-29, accepted in 2023-01-06,  发布年份 2023

来源: Frontiers

【 摘 要 】

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 >21.5o 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.

【 授权许可】

Unknown   
Copyright © 2023 Zaman, Lu, Almond, Burton, Alexander-Webber, Hofmann, Mitchell, Griffiths, Beere, Ritchie and Degl’Innocenti.