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Title: Nonlinear THz-nano metasurfaces
Authors: Dong, Tian
Li, Shaoxian
Manjappa, Manukumara
Yang, Peidi
Zhou Jiangping
Kong, Deyin
Quan, Baogang
Chen, Xieyu
Ouyang, Chen
Dai, Fei
Han, Jiaguang
Ouyang, Chunmei
Zhang, Xueqian
Li, Junjie
Li, Yang
Miao, Jungang
Li, Yutong
Wang, Li
Singh, Rajan
Zhang, Weili
Wu, Xiaojun
Keywords: Science::Physics
Issue Date: 2021
Source: Dong, T., Li, S., Manjappa, M., Yang, P., Zhou Jiangping, Kong, D., Quan, B., Chen, X., Ouyang, C., Dai, F., Han, J., Ouyang, C., Zhang, X., Li, J., Li, Y., Miao, J., Li, Y., Wang, L., Singh, R., ...Wu, X. (2021). Nonlinear THz-nano metasurfaces. Advanced Functional Materials, 31(24), 2100463-.
Project: RG191/17
Journal: Advanced Functional Materials
Abstract: Extreme terahertz (THz) science and technologies, the next disruptive frontier in nonlinear optics, provide multifaceted capabilities for exploring strong light-matter interactions in a variety of physical systems. However, current techniques involve the need for an extremely high-field free space THz source that is difficult to generate and has limited investigations to a rather weak and linear regime of light-matter interactions. Therefore, new approaches are being sought for the tight confinement of THz waves that can induce nonlinear effects. Here, a nonlinear “tera-nano” metasurface is demonstrated exhibiting extremely large THz nonlinearity and sensitive self-modulation of resonances at moderate incident THz field strengths. A record deep-subwavelength (≈λ/33 000) confinement of strongly enhanced (≈3200) THz field in a nano-gap (15 nm) exhibits remarkable THz field-tailored nonlinearity. Further, ultrafast injection of photocarriers reveals a competition between nonlinear THz field-induced intervalley scattering and optically driven interband excitations. The results on “tera-nano” metasurfaces enable a novel platform to realize enhanced nonlinear nano/micro composites for field-sensitive extreme THz nonlinear applications without the need for intense THz light sources.
ISSN: 1616-301X
DOI: 10.1002/adfm.202100463
Rights: © 2021 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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