Full-color enhanced second harmonic generation using rainbow trapping in ultrathin hyperbolic metamaterials

Junhao Li, Guangwei Hu, Lina Shi, Nan He, Daqian Li, Qiuyu Shang, Qing Zhang (), Huange Fu, Linlin Zhou, Wei Xiong (), Jianguo Guan, Jian Wang, Sailing He and Lin Chen ()
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Junhao Li: Huazhong University of Science and Technology
Guangwei Hu: National University of Singapore
Lina Shi: Chinese Academy of Sciences
Nan He: JORCEP, Zhejiang University
Daqian Li: Huazhong University of Science and Technology
Qiuyu Shang: Peking University
Qing Zhang: Peking University
Huange Fu: Huazhong University of Science and Technology
Linlin Zhou: Huazhong University of Science and Technology
Wei Xiong: Huazhong University of Science and Technology
Jianguo Guan: Wuhan University of Technology
Jian Wang: Huazhong University of Science and Technology
Sailing He: JORCEP, Zhejiang University
Lin Chen: Huazhong University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-26818-3

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