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Research Article

An on-Si directional second harmonic generation amplifier for MoS2/WS2 heterostructure

Jiaxing Du1,§, Jianwei Shi2,§, Chun Li1, Qiuyu Shang1, Xinfeng Liu2, Yuan Huang3( ), Qing Zhang1( )
School of Materials Science and Engineering, Peking University, Beijing 100871, China
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China

§ Jiaxing Du and Jianwei Shi contributed equally to this work.

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Graphical Abstract

In this work, we proposed a facile second harmonic generation (SHG) amplifier consisting of suspended MoS2/WS2 heterostructure on holey SiO2/Si substrate. In a broad wavelength range of 355 to 470 nm, the maximum enhancement factor could be two orders of magnitude.

Abstract

Transition metal dichalcogenides (TMD) heterostructure is widely applied for second harmonic generation (SHG) and holds great promises for laser source, nonlinear switch, and optical logic gate. However, for atomically thin TMD heterostructures, low SHG conversion efficiency would occur due to reduction of light–matter interaction length and lack of phase matching. Herein, we demonstrated a facile directional SHG amplifier formed by MoS2/WS2 monolayer heterostructures suspended on a holey SiO2/Si substrate. The SHG enhancement factor reaches more than two orders of magnitude in a wide spectral range from 355 to 470 nm, and the radiation angle is reduced from 38° to 19° indicating higher coherence and better emission directionality. The giant SHG enhancement and directional emission are attributed to the great excitation and emission field concentration induced by a self-formed vertical Fabry–Pérot microcavity. Our discovery gives helpful insights for the development of two-dimensional (2D) nonlinear optical devices.

Keywords

two-dimensional (2D) materialstransition metal dichalcogenidesheterostructuresecond harmonic generationfield enhancementoptical microcavity

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Nano Research
Volume 16 Issue 3,
March 2023
Pages 4061-4066
DOI: 10.1007/s12274-022-4898-x
Cite this article:
Du J, Shi J, Li C, et al. An on-Si directional second harmonic generation amplifier for MoS2/WS2 heterostructure. Nano Research, 2023, 16(3): 4061-4066. https://doi.org/10.1007/s12274-022-4898-x
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Received: 26 May 2022
Revised: 07 August 2022
Accepted: 11 August 2022
Published: 13 September 2022
© Tsinghua University Press 2022
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