Close encounters between two nanoshells
Close encounters between two nanoshells
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DOI：
10.1021/nl080271o
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发表时间：
2008-04-01
期刊：
影响因子：
10.8
通讯作者：
Halas, Naomi J.
中科院分区：
文献类型：
--
作者：
Lassiter, J. Britt;Aizpurua, Javier;Halas, Naomi J.
被称为“二聚体”的等离子体纳米粒子对体现了一种简单的系统，用于为表面增强光谱产生强烈的纳米尺度的场，并用于发展对耦合等离子体的理解。直接相邻的对和接触的几何结构中的单个纳米壳二聚体显示出显著不同的等离子体性质。在近距离处，杂化等离激元模式出现，其能量非常敏感地依赖于粒子间结点中少量分子的存在。当接触时，由于电荷转移振荡而产生的新的等离子体激元模式出现。由于体积极小的微小变化而导致的整体光学响应的极端修改，为超灵敏分子传感和光谱分析开辟了新的途径。
Plasmonic nanoparticle pairs known as "dimers" embody a simple system for generating intense nanoscale fields for surface enhanced spectroscopies and for developing an understanding of coupled plasmons. Individual nanoshell dimers in directly adjacent pairs and touching geometries show dramatically different plasmonic properties. At close distances, hybridized plasmon modes appear whose energies depend extremely sensitively on the presence of a small number of molecules in the interparticle junction. When touching, a new plasmon mode arising from charge transfer oscillations emerges. The extreme modification of the overall optical response due to minute changes in very reduced volumes opens up new approaches for ultrasensitive molecular sensing and spectroscopy.