Distance-dependent plasmon resonant coupling between a gold nanoparticle and gold film.

Distance-dependent plasmon resonant coupling between a gold nanoparticle and gold film.
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DOI:
10.1021/nl080872f
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发表时间:
2008-08
期刊:
影响因子:
10.8
通讯作者:
Smith DR
Smith DR
中科院分区:
材料科学1区
文献类型:
--
作者:
Mock JJ;Hill RT;Degiron A;Zauscher S;Chilkoti A;Smith DR

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我们提出了一个实验分析的金纳米粒子的等离子体散射特性可控地放置在一个金金属膜纳米。理论研究表明,该体系的光谱响应是纳米粒子的局域等离子体激元共振和金膜的表面等离子体激元相互作用的结果。此外,我们还报道了金属薄膜对单个纳米粒子的光散射产生偏振,导致在远场成像时出现环状的点扩散函数。光谱响应和偏振效应对纳米粒子-薄膜的分离距离都非常敏感。这样的系统在潜在的生物计量学和诊断设备中显示出了希望。
We present an experimental analysis of the plasmonic scattering properties of gold nanoparticles controllably placed nanometers away from a gold metal film. We show that the spectral response of this system results from the interplay between the localized plasmon resonance of the nanoparticle and the surface plasmon polaritons of the gold film, as previously predicted by theoretical studies. In addition, we report that the metal film induces a polarization to the single nanoparticle light scattering, resulting in a doughnut-shaped point spread function when imaged in the far-field. Both the spectral response and the polarization effects are highly sensitive to the nanoparticle–film separation distance. Such a system shows promise in potential biometrology and diagnostic devices.
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