Direct observation of localized surface plasmon field enhancement by Kelvin probe force microscopy

Light, Science & Applications
Dabing LiZhi-Ming Li

Abstract

A surface plasmon (SP) is a fundamental excitation state that exists in metal nanostructures. Over the past several years, the performance of optoelectronic devices has been improved greatly via the SP enhancement effect. In our previous work, the responsivity of GaN ultraviolet detectors was increased by over 30 times when using Ag nanoparticles. However, the physics of the SP enhancement effect has not been established definitely because of the lack of experimental evidence. To reveal the physical origin of this enhancement, Kelvin probe force microscopy (KPFM) was used to observe the SP-induced surface potential reduction in the vicinity of Ag nanoparticles on a GaN epilayer. Under ultraviolet illumination, the localized field enhancement induced by the SP forces the photogenerated electrons to drift close to the Ag nanoparticles, leading to a reduction of the surface potential around the Ag nanoparticles on the GaN epilayer. For an isolated Ag nanoparticle with a diameter of ~200 nm, the distribution of the SP localized field is located within 60 nm of the boundary of the Ag nanoparticle. For a dimer of Ag nanoparticles, the localized field enhancement between the nanoparticles was the strongest. The results presented here ...Continue Reading

References

May 24, 2008·Nature Materials·Jeffrey N AnkerRichard P Van Duyne
Sep 3, 2008·Chemical Society Reviews·Viktor MyroshnychenkoF Javier García de Abajo
Aug 18, 2009·Nature·M A NoginovU Wiesner
Feb 20, 2010·Nature Materials·Harry A Atwater, Albert Polman
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May 15, 2015·Scientific Reports·Naveen GandraSrikanth Singamaneni
Jun 3, 2016·Light, Science & Applications·Gabriel LozanoJaime Gómez Rivas

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Citations

Jan 16, 2019·Angewandte Chemie·Reem A KaraballiMita Dasog
Mar 14, 2020·Nanotechnology·Ngasepam Monica Devi, Naorem Khelchand Singh
Jul 19, 2020·Optics Express·Changzong MiaoCaixia Kan
Mar 16, 2019·Nanoscale Research Letters·Zhiwei TangWei Lü
Oct 27, 2020·Advanced Science·Hyunhwa LeeJeong Young Park
May 2, 2021·Light, Science & Applications·Qing CaiRong Zhang

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Methods Mentioned

BETA
atomic force microscopy
AFM

Software Mentioned

KPFM
Comsol

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