Probing dynamically tunable localized surface plasmon resonances of film-coupled nanoparticles by evanescent wave excitation.
Probing dynamically tunable localized surface plasmon resonances of film-coupled nanoparticles by evanescent wave excitation.
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DOI：
10.1021/nl204596h
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发表时间：
2012-04-11
期刊：
影响因子：
10.8
通讯作者：
Smith DR
中科院分区：
文献类型：
--
作者：
Mock JJ;Hill RT;Tsai YJ;Chilkoti A;Smith DR
与金纳米粒子(NP)耦合到金膜上的局域表面等离子体共振(LSPR)谱对场紧密局域化的纳米带隙区域表现出极高的敏感性。利用类似于激发金属薄膜表面等离子体共振(SPR)的照明方案，可以观察到薄膜耦合NPs系综的LSPR；然而，在目前的系统中，光被用来探测NPs与薄膜之间的间隙的高度敏感的与距离相关的LSPR，而不是薄膜的离域SPR。我们发现SPR和LSPR的光谱贡献可以很容易地区分开来，并且我们比较了这两种模式对一组NPs和金膜之间的平均间隙中的位移的敏感性。纳米粒子在溶液中悬浮在金膜上方的距离通过薄的分子间隔层固定，并可以通过将纳米粒子置于准静态电场中来进一步调制。观察到的由外加电压触发的LSPR光谱漂移可以与NPs的Angstrom尺度位移相关联，这表明芯片规模或流动单元等离子体纳米尺度器件具有极高的灵敏度。
The localized surface plasmon resonance (LSPR) spectrum associated with a gold nanoparticle (NP) coupled to a gold film exhibits extreme sensitivity to the nano-gap region where the fields are tightly localized. The LSPR of an ensemble of film-coupled NPs can be observed using an illumination scheme similar to that used to excite the surface plasmon resonance (SPR) of a thin metallic film; however, in the present system, the light is used to probe the highly sensitive distance-dependent LSPR of the gaps between NPs and film rather than the delocalized SPR of the film. We show that the SPR and LSPR spectral contributions can be readily distinguished, and we compare the sensitivities of both modes to displacements in the average gap between a collection of NPs and the gold film. The distance by which the NPs are suspended in solution above the gold film is fixed via a thin molecular spacer layer, and can be further modulated by subjecting the NPs to a quasistatic electric field. The observed LSPR spectral shifts triggered by the applied voltage can be correlated with Angstrom scale displacements of the NPs, suggesting the potential for chip-scale or flow-cell plasmonic nanoruler devices with extreme sensitivity.
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影响因子：
10.8
作者：
Hill RT;Mock JJ;Urzhumov Y;Sebba DS;Oldenburg SJ;Chen SY;Lazarides AA;Chilkoti A;Smith DR
通讯作者：
Smith DR
影响因子：
10.8
作者：
Ikeda, Katsuyoshi;Suzuki, Shuto;Uosaki, Kohei
通讯作者：
Uosaki, Kohei
影响因子：
4.4
作者：
Hao, E;Schatz, GC
通讯作者：
Schatz, GC
影响因子：
3.6
作者：
Leveque, Gaeetan;Martin, Olivier J. F.
通讯作者：
Martin, Olivier J. F.
影响因子：
3.6
作者：
Brunazzo, Daniele;Descrovi, Emiliano;Martin, Olivier J. E.
通讯作者：
Martin, Olivier J. E.