Quantum plasmon enhanced nonlinear wave mixing in graphene nanoflakes

doi:10.1088/1674-1056/abea8d

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.

Keywords: quantum plasmons nonlinear optical wave mixing graphene nanoflakes

Received: 17 December 2020
Revised: 09 February 2021
Accepted manuscript online: 01 March 2021

PACS:	42.50.Ct	(Quantum description of interaction of light and matter; related experiments)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	42.65.An	(Optical susceptibility, hyperpolarizability)

Fund: 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).

Corresponding Authors: ^†Corresponding author. E-mail: dhy0805@alumni.sjtu.edu.cn ^‡Corresponding author. E-mail: fangweiye@sjtu.edu.cn

Cite this article:

Hanying Deng(邓寒英), Changming Huang(黄长明), Yingji He(何影记), and Fangwei Ye(叶芳伟) Quantum plasmon enhanced nonlinear wave mixing in graphene nanoflakes 2021 Chin. Phys. B 30 044213

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