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.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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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)
- Creator
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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
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10.1515/nanoph-2021-0801
- URN
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urn:nbn:de:101:1-2022120813281887297713
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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15.08.2025, 7:27 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- 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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