Ultrafast Optical Modulation of Harmonic Generation in Two-Dimensional Materials

The modulation of optical harmonic generation in two-dimensional (2D) materials is of paramount importance in nanophotonic and nano-optoelectronic devices for their applications in optical switching and communication. However, an effective route with ultrafast modulation speed, ultrahigh modulation...

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Bibliographic Details
Published in:Nano letters 2020-11, Vol.20 (11), p.8053-8058
Main Authors: Cheng, Yang, Hong, Hao, Zhao, Hui, Wu, Chunchun, Pan, Yu, Liu, Can, Zuo, Yonggang, Zhang, Zhihong, Xie, Jin, Wang, Jinhuan, Yu, Dapeng, Ye, Yu, Meng, Sheng, Liu, Kaihui
Format: Article
Language:English
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Summary:The modulation of optical harmonic generation in two-dimensional (2D) materials is of paramount importance in nanophotonic and nano-optoelectronic devices for their applications in optical switching and communication. However, an effective route with ultrafast modulation speed, ultrahigh modulation depth, and broad operation wavelength range is awaiting a full exploration. Here, we report that an optical pump can dynamically modulate the third harmonic generation (THG) of a graphene monolayer with a relative modulation depth above 90% at a time scale of 2.5 ps for a broad frequency ranging from near-infrared to ultraviolet. Our observation, together with the real-time, time-dependent density functional theory (TDDFT) simulations, reveals that this modulation process stems from nonlinear dynamics of the photoexcited carriers in graphene. The superior performance of the nonlinear all-optical modulator based on 2D materials paves the way for its potential applications including nanolasers and optical communication circuits.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.0c02972