A graphene-metal metasurface for terahertz modulation with a depth of several orders of magnitude

Ruqiao Xia; Nikita W. Almond; Wadood Tadbier; Harvey E. Beere; Stephan Hofmann; David A. Ritchie; Wladislaw Michailow

doi:10.1117/12.3031695

15 November 2024 A graphene-metal metasurface for terahertz modulation with a depth of several orders of magnitude

Ruqiao Xia, Nikita W. Almond, Wadood Tadbier, Harvey E. Beere, Stephan Hofmann, David A. Ritchie, Wladislaw Michailow

Author Affiliations +

Proceedings Volume 13203, Sensors and Communication Technologies in the 1 GHz to 10 THz Band; 132030D (2024) https://doi.org/10.1117/12.3031695
Event: Security + Defence, 2024, Edinburgh, United Kingdom

Abstract

Next-generation communication systems require rapid and efficient control of terahertz (THz) signals to encode data streams. Graphene-based metamaterials emerge as a promising candidate for effective THz modulation as a result of graphene’s large electrically controllable conductivity. However, a significant challenge arises from the inability of graphene to achieve full depletion at the Dirac point, limiting the modulation depth in most LC-resonant metamaterial modulators in transmission. To overcome this limitation, we exploit the destructive interference of Fresnel reflection components. Our study shows single-layer, solid-state graphene-based modulators operating in the terahertz range with several orders of magnitude modulation depth, validated through terahertz time-domain spectroscopy measurements. These findings underscore the potential of graphene-based metamaterials in advancing THz communication technologies.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ruqiao Xia, Nikita W. Almond, Wadood Tadbier, Harvey E. Beere, Stephan Hofmann, David A. Ritchie, and Wladislaw Michailow "A graphene-metal metasurface for terahertz modulation with a depth of several orders of magnitude", Proc. SPIE 13203, Sensors and Communication Technologies in the 1 GHz to 10 THz Band, 132030D (15 November 2024); https://doi.org/10.1117/12.3031695

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