Fanoshells: Nanoparticles with Built-in Fano Resonances

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• 作者：Shaunak Mukherjee ; Heidar Sobhani ; J. Britt Lassiter ; Rizia Bardhan ; Peter Nordlander ; Naomi J. Halas
• 刊名：Nano Letters
• 出版年：2010
• 出版时间：July 14, 2010
• 年：2010
• 卷：10
• 期：7
• 页码：2694-2701
• 全文大小：580K
• 年卷期：v.10,no.7(July 14, 2010)
• ISSN：1530-6992

文摘

A nanoparticle consisting of a dielectric (SiO₂) and metallic (Au) shell layer surrounding a solid Au nanoparticle core can be designed with its superradiant and subradiant plasmon modes overlapping in energy, resulting in a Fano resonance in its optical response. Synthesis of this nanoparticle around an asymmetric core yields a structure that possesses additional Fano resonances as revealed by single particle dark field microspectroscopy. A mass-and-spring coupled oscillator model provides an excellent description of the plasmon interactions and resultant optical response of this nanoparticle.

Keywords:

Plasmon; Fano resonance; nanoshell; dark field; harmonic oscillator; coherent phenomena