Lassiter J Britt, Aizpurua Javier, Hernandez Luis I, Brandl Daniel W, Romero Isabel, Lal Surbhi, Hafner Jason H, Nordlander Peter, Halas Naomi J
Department of Physics and Astronomy, Laboratory for Nanophotonics, Rice University, Houston, TX 77005, USA.
Nano Lett. 2008 Apr;8(4):1212-8. doi: 10.1021/nl080271o. Epub 2008 Mar 18.
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.
被称为“二聚体”的等离激元纳米颗粒对是一种简单的系统，用于为表面增强光谱学产生强烈的纳米级场，并用于深入了解耦合等离激元。直接相邻对和接触几何结构中的单个纳米壳二聚体表现出截然不同的等离激元特性。在近距离时，会出现杂化等离激元模式，其能量极其敏感地取决于粒子间连接处少量分子的存在。当相互接触时，会出现由电荷转移振荡产生的新等离激元模式。由于在极小体积内的微小变化而导致的整体光学响应的极端改变，为超灵敏分子传感和光谱学开辟了新途径。
