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arXiv 1003.2624cond-mat.mes-hall
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金纳米谐振器的集体等离子体激元模对局域环境的敏感性

Sensitivity of Collective Plasmon Modes of Gold Nanoresonators to Local Environment

V. G. Kravets, F. Schedin, A. V. Kabashin, A. N. Grigorenko

摘要:

我们提出了第一个实验研究的光学响应的集体等离子体共振在规则阵列的纳米谐振器局部环境。最近观察到的集体等离子体激元模式出现由于衍射耦合的局部等离子体激元和产量几乎一个数量级的改善共振质量。我们测量这些模式的气体和液体介质的折射率的微小变化的响应。我们发现,集体共振的相位灵敏度可以比相同纳米点阵列的最佳振幅灵敏度好两个数量级以上,并且比SPR传感器中的相位灵敏度好一个数量级。

英文摘要:

We present the first experimental study of optical response of collective plasmon resonances in regular arrays of nanoresonators to local environment. Recently observed collective plasmon modes arise due to diffractive coupling of localised plasmons and yield almost an order of magnitude improvement in resonance quality. We measure the response of these modes to tiny variations of the refractive index of both gaseous and liquid media. We show that the phase sensitivity of the collective resonances can be more than two orders of magnitude better than the best amplitude sensitivity of the same nanodot array as well as an order of magnitude better than the phase sensitivity in SPR sensors.

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