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Title: Full-color enhanced second harmonic generation using rainbow trapping in ultrathin hyperbolic metamaterials
Authors: Li, Junhao
Hu, Guangwei 
Shi, Lina
He, Nan
Li, Daqian
Shang, Qiuyu
Zhang, Qing
Fu, Huange
Zhou, Linlin
Xiong, Wei
Guan, Jianguo
Wang, Jian
He, Sailing
Chen, Lin
Issue Date: 5-Nov-2021
Publisher: Nature Research
Citation: Li, Junhao, Hu, Guangwei, Shi, Lina, He, Nan, Li, Daqian, Shang, Qiuyu, Zhang, Qing, Fu, Huange, Zhou, Linlin, Xiong, Wei, Guan, Jianguo, Wang, Jian, He, Sailing, Chen, Lin (2021-11-05). Full-color enhanced second harmonic generation using rainbow trapping in ultrathin hyperbolic metamaterials. Nature Communications 12 (1) : 6425. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Metasurfaces have provided a promising approach to enhance the nonlinearity at subwavelength scale, but usually suffer from a narrow bandwidth as imposed by sharp resonant features. Here, we counterintuitively report a broadband, enhanced second-harmonic generation, in nanopatterned hyperbolic metamaterials. The nanopatterning allows the direct access of the mode with large momentum, rendering the rainbow light trapping, i.e. slow light in a broad frequency, and thus enhancing the local field intensity for boosted nonlinear light-matter interactions. For a proof-of-concept demonstration, we fabricated a nanostructured Au/ZnO multilayer, and enhanced second harmonic generation can be observed within the visible wavelength range (400-650 nm). The enhancement factor is over 50 within the wavelength range of 470-650 nm, and a maximum conversion efficiency of 1.13×10?6 is obtained with a pump power of only 8.80 mW. Our results herein offer an effective and robust approach towards the broadband metasurface-based nonlinear devices for various important technologies. © 2021, The Author(s).
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-021-26818-3
Rights: Attribution 4.0 International
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