Enhanced second-harmonic generation in monolayer MoS2 on suspended metallic nanostructures by plasmonic resonances

Leng Qing; Su Huanhuan; Liu Jianqiang; Zhou Lin; Qin Kang; Wang Qianjin; Fu Junqi; Wu Shan; Zhang Xuejin

doi:10.1515/nanoph-2021-0030

Nanophotonics (May 2021)

Enhanced second-harmonic generation in monolayer MoS2 on suspended metallic nanostructures by plasmonic resonances

Leng Qing,
Su Huanhuan,
Liu Jianqiang,
Zhou Lin,
Qin Kang,
Wang Qianjin,
Fu Junqi,
Wu Shan,
Zhang Xuejin

Affiliations

Leng Qing: Key Laboratory of Functional Materials and Devices for Informatics of Anhui Higher Education Institutes, Fuyang Normal University, Fuyang, 236037, China
Su Huanhuan: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics and College of Engineering and Applied Sciences, Nanjing University, Nanjing210093, China
Liu Jianqiang: School of Science, Jiujiang University, Jiujiang332005, China
Zhou Lin: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics and College of Engineering and Applied Sciences, Nanjing University, Nanjing210093, China
Qin Kang: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics and College of Engineering and Applied Sciences, Nanjing University, Nanjing210093, China
Wang Qianjin: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics and College of Engineering and Applied Sciences, Nanjing University, Nanjing210093, China
Fu Junqi: Key Laboratory of Functional Materials and Devices for Informatics of Anhui Higher Education Institutes, Fuyang Normal University, Fuyang, 236037, China
Wu Shan: Key Laboratory of Functional Materials and Devices for Informatics of Anhui Higher Education Institutes, Fuyang Normal University, Fuyang, 236037, China
Zhang Xuejin: National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, School of Physics and College of Engineering and Applied Sciences, Nanjing University, Nanjing210093, China

DOI: https://doi.org/10.1515/nanoph-2021-0030
Journal volume & issue: Vol. 10, no. 7
pp. 1871 – 1877

Abstract

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Monolayer transition metal dichalcogenides (TMDs) possess large second-order nonlinear responses due to the broken inversion symmetry, which can extend their intriguing applications in nonlinear nanophotonics and optoelectronics. However, the atomic thickness of monolayer TMDs severely decreases the interaction length with free light with respect to bulk materials, leading to rather low second-harmonic generation (SHG) conversion efficiency. Here, we demonstrate a hybrid structure consisting of a monolayer MoS2 on a suspended perforated silver film, on which the SHG signal emitted from the monolayer MoS2 is enhanced by more than three orders of magnitude at room temperature. The pronounced SHG enhancement is attributed to the distinct electric field amplification nearby the nanoholes, which is induced by the symmetric surface plasmon polaritons (SPPs) existing in the ultrathin suspended silver grating. Our results reported here may establish the substrate-free engineering of nonlinear optical effects via plasmonic nanostructures on demand.

Published in Nanophotonics

ISSN: 2192-8606 (Print); 2192-8614 (Online)
Publisher: De Gruyter
Country of publisher: Germany
LCC subjects: Science: Physics
Website: https://www.degruyter.com/journal/key/nanoph/html#submit

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