Terahertz Metamaterial Optoelectronic Modulators with GHz Reconfiguration Speed

Zaman, Abdullah M. and Lu, Yuezhen and Romain, Xavier and Almond, Nikita W. 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.A. and DeglInnocenti, Riccardo (2022) Terahertz Metamaterial Optoelectronic Modulators with GHz Reconfiguration Speed. IEEE Transactions on Terahertz Science and Technology, 12 (5). pp. 520-526. ISSN 2156-342X

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Abstract

All-electronic ultrafast control of terahertz radiation is demonstrated in integrated metamaterial/graphene devices. By electrostatic gating the graphene conductivity, the overall optical response of the incident terahertz E-field is modified. Depending on the configuration, amplitude, phase, and polarization of terahertz radiation could be modulated with GHz range of reconfiguration speed. An extinction ratio of >7.6 dB in amplitude is achieved at the resonant frequency of 0.75 THz. Additionally, a relative phase shift of >17.4°. is observed around a frequency of 0.68 THz. When operating as a polarization modulator, the device has reported an ellipticity change of ~40% at a frequency of 0.68 THz and a dynamic rotation of the polarization plane by >9°at resonance. The switching capability of the modulators has been investigated all electronically reporting a speed exceeding 3 GHz, only limited by the available instrumentation. Consequently, GHz-speed of modulation can be achieved for frequencies around 0.75 THz. These results represent a breakthrough for all applications where a fast, versatile and efficient modulation of THz radiation is required, such as in next-generation wireless communication, quantum electronics, and ultrafast imaging.

Item Type:
Journal Article
Journal or Publication Title:
IEEE Transactions on Terahertz Science and Technology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2208
Subjects:
ID Code:
171472
Deposited By:
Deposited On:
08 Jun 2022 08:55
Refereed?:
Yes
Published?:
Published
Last Modified:
22 Nov 2022 11:31