中国物理B ›› 2021, Vol. 30 ›› Issue (4): 44213-.doi: 10.1088/1674-1056/abea8d

所属专题： SPECIAL TOPIC — Optical field manipulation

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  • 收稿日期:2020-12-17 修回日期:2021-02-09 接受日期:2021-03-01 出版日期:2021-03-16 发布日期:2021-03-24

Quantum plasmon enhanced nonlinear wave mixing in graphene nanoflakes

Hanying Deng(邓寒英)1,†, Changming Huang(黄长明)2, Yingji He(何影记)1, and Fangwei Ye(叶芳伟)3,‡   

  1. 1 School of Photoelectric Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China; 2 Department of Electronic Information and Physics, Changzhi University, Changzhi 046011, China; 3 School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2020-12-17 Revised:2021-02-09 Accepted:2021-03-01 Online:2021-03-16 Published:2021-03-24
  • Contact: †Corresponding author. E-mail: dhy0805@alumni.sjtu.edu.cn ‡Corresponding author. E-mail: fangweiye@sjtu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11947007), the Natural Science Foundation of Guangdong Province, China (Grant No. 2019A1515011499), and the Department of Education of Guangdong Province, China (Grant No. 2019KTSCX087).

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Abstract: A distant-neighbor quantum-mechanical method is used to study the nonlinear optical wave mixing in graphene nanoflakes (GNFs), including sum-and difference-frequency generation, as well as four-wave mixing. Our analysis shows that molecular-scale GNFs support quantum plasmons in the visible spectrum region, and significant enhancement of nonlinear optical wave mixing is achieved. Specifically, the second-and third-order wave-mixing polarizabilities of GNFs are dramatically enhanced, provided that one (or more) of the input or output frequencies coincide with a quantum plasmon resonance. Moreover, by embedding a cavity into hexagonal GNFs, we show that one can break the structural inversion symmetry and enable otherwise forbidden second-order wave mixing, which is found to be enhanced by the quantum plasmon resonance too. This study reveals that the molecular-sized graphene could be used in the quantum regime for nanoscale nonlinear optical devices and ultrasensitive molecular sensors.

Key words: quantum plasmons, nonlinear optical wave mixing, graphene nanoflakes

中图分类号:  (Quantum description of interaction of light and matter; related experiments)

  • 42.50.Ct
42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation) 42.65.An (Optical susceptibility, hyperpolarizability)