Effects of edge on graphene plasmons as revealed by infrared nanoimaging

Light, Science & Applications
Qingyang XuQiaoliang Bao

Abstract

We used scattering-type scanning near-field optical microscopy (s-SNOM) to investigate the plasmonic properties of edges in well-defined graphene nanostructures, including sharp tapers, nanoribbons and nanogaps, which were all fabricated via the growth-etching chemical vapor deposition (GECVD) method. The obtained near-field images revealed the localized plasmon modes along the graphene nanoribbon; these modes strongly depended on the size of the graphene pattern, the angle of the tapered graphene and the infrared excitation wavelength. These interesting plasmon modes were verified by numerical simulations and explained by the reflection, and interference of electromagnetic waves at the graphene-SiO2 edge. The constructive interference at the graphene nanogap caused by charge accumulation was demonstrated for the first time. Using the infrared nanoimaging technique, greater plasmon broadening was observed in the zigzag edge than in the armchair edge. Our study suggests that graphene edges should be separated by an effective working distance to avoid the overlapping of localized plasmon modes, which is very important for the design of graphene-based plasmonic circuits and devices.

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Citations

Nov 8, 2018·The Analyst·Gregory Q Wallace, François Lagugné-Labarthet
Dec 18, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Hui-Cong LiHong-Xing Zhang
Aug 22, 2018·Nanoscale·Guanghui ChengChanggan Zeng
May 22, 2019·Scientific Reports·Muhammed Abdullah Unutmaz, Mehmet Unlu
Dec 10, 2019·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Jian ChaiYuee Li
May 30, 2021·Advanced Materials·Jianwei BenXiaojuan Sun

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Methods Mentioned

BETA
atomic force microscopy
AFM
scanning plasmon interferometry

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