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Nonlinear Terahertz Generation: Chiral and Achiral Meta-atom Coupling

Nonlinear Terahertz Generation: Chiral and Achiral Meta-atom Coupling
Nonlinear Terahertz Generation: Chiral and Achiral Meta-atom Coupling
Generation and manipulation of terahertz (THz) waves are of vital importance to advance THz technology. Nonlinear metasurfaces allow effective integration of both processes into a single compact device. However, such existing THz devices commonly rely on utilizing a single meta-atom, which has fixed THz generation properties and thus limits the range of achievable functionalities. Here, for the first time to our knowledge, we introduce a coupling effect between different meta-atoms into the unit-cell design, and experimentally validate this new degree of freedom in controlling the nonlinear THz generation, where achiral coupling provides full control over the amplitude of the generated THz field, while chiral coupling makes the THz generation sensitive to the handedness of the pump polarization. In particular, the chiral coupling case further allows a multiplexing-based handedness-selective nonlinear metasurface, which generates THz beams with different orbital angular momenta (OAMs). This approach is promising in developing various integrated nonlinear THz devices.
chirality, coupled resonators, holography, metasurface, nonlinear optics, optical angular momentum, terahertz, vortex beam, amplitude tuning, coupling, nonlinear circular dichroism, nonlinear metasurfaces, broadband terahertz generation
1616-301X
Wang, Qingwei
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Zhang, Xueqian
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Xu, Quan
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Feng, Xi
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Lu, Yongchang
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Niu, Li
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Chen, Xieyu
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Plum, Eric
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Gu, Jianqiang
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Yang, Quanlong
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Fang, Ming
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Huang, Zhixiang
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Zhang, Shuang
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Han, Jiaguang
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Zhang, Weili
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Wang, Qingwei
d861d36f-45d3-4ca6-8e5e-a6930bfd12d8
Zhang, Xueqian
94e50528-12a0-414a-b789-423815daa8e6
Xu, Quan
b97a36eb-cace-496b-b45e-90cf42a110d8
Feng, Xi
bc46c398-b7a0-462b-93b5-d98191e3a565
Lu, Yongchang
5e886530-46bd-4744-9904-3dbb81ace059
Niu, Li
e5f9bc62-e52b-486a-8c91-2b9c86601ebb
Chen, Xieyu
3f8dacf6-0ba1-44b9-8062-eba039871039
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
Gu, Jianqiang
3ab200c4-c244-41e8-8ef0-cdb14e6aa1e4
Yang, Quanlong
13a48ecd-ebce-4c92-8255-3b135ad0587e
Fang, Ming
ec5dc2a5-5022-4310-8fca-1fcf7f1fd159
Huang, Zhixiang
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Zhang, Shuang
af2e2fae-3077-40b5-863b-22a45d691957
Han, Jiaguang
4591e2ce-9804-45f2-907a-a915386b3922
Zhang, Weili
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Wang, Qingwei, Zhang, Xueqian, Xu, Quan, Feng, Xi, Lu, Yongchang, Niu, Li, Chen, Xieyu, Plum, Eric, Gu, Jianqiang, Yang, Quanlong, Fang, Ming, Huang, Zhixiang, Zhang, Shuang, Han, Jiaguang and Zhang, Weili (2023) Nonlinear Terahertz Generation: Chiral and Achiral Meta-atom Coupling. Advanced Functional Materials, 33 (29), [2300639]. (doi:10.1002/adfm.202300639).

Record type: Article

Abstract

Generation and manipulation of terahertz (THz) waves are of vital importance to advance THz technology. Nonlinear metasurfaces allow effective integration of both processes into a single compact device. However, such existing THz devices commonly rely on utilizing a single meta-atom, which has fixed THz generation properties and thus limits the range of achievable functionalities. Here, for the first time to our knowledge, we introduce a coupling effect between different meta-atoms into the unit-cell design, and experimentally validate this new degree of freedom in controlling the nonlinear THz generation, where achiral coupling provides full control over the amplitude of the generated THz field, while chiral coupling makes the THz generation sensitive to the handedness of the pump polarization. In particular, the chiral coupling case further allows a multiplexing-based handedness-selective nonlinear metasurface, which generates THz beams with different orbital angular momenta (OAMs). This approach is promising in developing various integrated nonlinear THz devices.

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More information

Accepted/In Press date: 14 March 2023
e-pub ahead of print date: 2 April 2023
Published date: 18 July 2023
Additional Information: Funding Information: This work was supported by the National Natural Science Foundation of China (Grant Nos. 61735012, 62025504, 62075158, 61875150, 61935015, 62005193, 11974259, 62271004, 62231003 and U20A20164); the UK's Engineering and Physical Sciences Research Council (Grant No. EP/T02643X/1); H2020 ERC Consolidator Grant (648783); Yunnan Expert Workstation (202205AF150008). Publisher Copyright: © 2023 Wiley-VCH GmbH.
Keywords: chirality, coupled resonators, holography, metasurface, nonlinear optics, optical angular momentum, terahertz, vortex beam, amplitude tuning, coupling, nonlinear circular dichroism, nonlinear metasurfaces, broadband terahertz generation

Identifiers

Local EPrints ID: 476196
URI: http://eprints.soton.ac.uk/id/eprint/476196
ISSN: 1616-301X
PURE UUID: e57930a5-3ba4-45d2-87c2-9d2fa91879fe
ORCID for Eric Plum: ORCID iD orcid.org/0000-0002-1552-1840

Catalogue record

Date deposited: 13 Apr 2023 17:05
Last modified: 06 Jun 2024 01:46

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Contributors

Author: Qingwei Wang
Author: Xueqian Zhang
Author: Quan Xu
Author: Xi Feng
Author: Yongchang Lu
Author: Li Niu
Author: Xieyu Chen
Author: Eric Plum ORCID iD
Author: Jianqiang Gu
Author: Quanlong Yang
Author: Ming Fang
Author: Zhixiang Huang
Author: Shuang Zhang
Author: Jiaguang Han
Author: Weili Zhang

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