Gate-tuned graphene meta-devices for dynamically controlling terahertz wavefronts

Abstract: Dynamical controls on terahertz (THz) wavefronts are crucial for many applications, but available mechanism requests tunable elements with sub-micrometer sizes that are difficult to find in the THz regime. Here, different from the local-tuning mechanism, we propose an alternative approach to construct wavefront-control meta-devices combining specifically designed metasurfaces and globally tuned graphene layers. Coupled-mode-theory (CMT) analyses reveal that graphene serves as a tunable loss to drive the whole meta-device to transit from one functional phase to another passing through an intermediate regime, exhibiting distinct far-field (FF) reflection wavefronts. As a proof of concept, we design/fabricate a graphene meta-device and experimentally demonstrate that it can reflect normally incident THz wave to pre-designed directions with different polarizations under appropriate gating voltages. We finally design a graphene meta-device and numerically demonstrate that it can generate vectorial THz beams with continuously varying polarization distributions upon gating. These findings pave the road to realizing a wide range of THz applications, such as sensing, imaging, and wireless communications.

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch

Erschienen in
Gate-tuned graphene meta-devices for dynamically controlling terahertz wavefronts ; volume:11 ; number:9 ; year:2022 ; pages:2085-2096 ; extent:12
Nanophotonics ; 11, Heft 9 (2022), 2085-2096 (gesamt 12)

Urheber
Li, Qiushi
Cai, Xiaodong
Liu, Tong
Jia, Min
Wu, Qiong
Zhou, Haoyang
Liu, Huanhuan
Wang, Qianqian
Ling, Xiaohui
Chen, Cong
Ding, Fan
He, Qiong
Zhang, Yuanbo
Xiao, Shiyi
Zhou, Lei

DOI
10.1515/nanoph-2021-0801
URN
urn:nbn:de:101:1-2022120813281887297713
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 07:27 MESZ

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Beteiligte

  • Li, Qiushi
  • Cai, Xiaodong
  • Liu, Tong
  • Jia, Min
  • Wu, Qiong
  • Zhou, Haoyang
  • Liu, Huanhuan
  • Wang, Qianqian
  • Ling, Xiaohui
  • Chen, Cong
  • Ding, Fan
  • He, Qiong
  • Zhang, Yuanbo
  • Xiao, Shiyi
  • Zhou, Lei

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