journal article·2021-06

Nonlinear THz‐Nano Metasurfaces

Tian Dong, Shaoxian Li, Manukumara Manjappa, Peidi Yang, Jiangping Zhou, Deyin Kong, Baogang Quan, Xieyu Chen, Chen Ouyang, Fei Dai, Jiaguang Han, Chunmei Ouyang, Xueqian Zhang, Junjie Li, Yang Li, Jungang Miao, Yutong Li, Li Wang, Ranjan Singh, Weili Zhang, Xiaojun Wu

Advanced Functional Materials· Volume 31· Issue 24
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Abstract

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.
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Research context

OpenAlex topics: Plasmonic and Surface Plasmon Research · Terahertz technology and applications · Metamaterials and Metasurfaces Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Electronic and Information Engineering Beihang University Beijing 100083 China

Center for THz Waves and College of Precision Instrument and Optoelectronics Engineering, and the Key Laboratory of Optoelectronics Information and Technology Tianjin University Tianjin 300072 China

Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore

Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

State Key Laboratory of Precision Measurement Technology and Instrument Department of Precision Instrument Tsinghua University Beijing 100084 China

School of Electrical and Computer Engineering Oklahoma State University Stillwater OK 74078 USA

Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China

Funding

National Natural Science Foundation of China

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