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Nano Research 2023, 16(3): 4061-4066 https://doi.org/10.1007/s12274-022-4898-x
Research Article | Issue | Published: 13 September 2022

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

Show Author's Information 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.

Keywords:
two-dimensional (2D) materials, heterostructure, transition metal dichalcogenides, second harmonic generation, field enhancement, optical microcavity
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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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Abstract Full text Electronic supplementary material About this article

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.


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Electronic supplementary material
About this article

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

Show Author's information 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.

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) materials, heterostructure, transition metal dichalcogenides, second harmonic generation, field enhancement, optical microcavity

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Publication history
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Acknowledgements

Publication history

Received: 26 May 2022
Revised: 07 August 2022
Accepted: 11 August 2022
Published: 13 September 2022
Issue date: March 2023

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

We acknowledge funding support from the National Natural Science Foundation of China (Nos. 51991340, 51991344, 52072006, 62022089, and 11874405), the Natural Science Foundation of Beijing Municipality (No. JQ21004), the National Key Research and Development Program of China (No. 2019YFA0308000), Chongqing Outstanding Youth Fund (No. 2021ZX0400005), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (No. XDB33000000).

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