Broadband tunability of surface plasmon resonance in graphene-coating silica nanoparticles

Graphene decorated nanomaterials and nanostructures can potentially be used in military and medical science applications. In this article, we study the optical properties of a graphene wrapping silica core–shell spherical nanoparticle under illumination of external light by using the Mie theory. We...

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Bibliographic Details
Published in:Chinese physics B 2016-05, Vol.25 (5), p.393-399
Main Author: 史哲 杨阳 甘霖 李志远
Format: Article
Language:English
Subjects:
Graphene
Mathematical models
Medical science
Mie散射理论
Nanoparticles
Nanostructure
Plasmons
Silicon dioxide
Wrapping
二氧化硅
包覆
宽带可调谐
石墨
硅纳米颗粒
等效介电常数
表面等离子体共振
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Summary:Graphene decorated nanomaterials and nanostructures can potentially be used in military and medical science applications. In this article, we study the optical properties of a graphene wrapping silica core–shell spherical nanoparticle under illumination of external light by using the Mie theory. We find that the nanoparticle can exhibit surface plasmon resonance（SPR） that can be broadly tuned from mid infrared to near infrared via simply changing the geometric parameters. A simplified equivalent dielectric permittivity model is developed to better understand the physics of SPR, and the calculation results agree well qualitatively with the rigorous Mie theory. Both calculations suggest that a small radius of graphene wrapping nanoparticle with high Fermi level could move the SPR wavelength of graphene into the near infrared regime.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/25/5/057803