Eberhard Karls University Tübingen, Institute of Physical and Theoretical Chemistry, 72076 Tübingen, Germany.
Phys Chem Chem Phys. 2013 Apr 21;15(15):5407-14. doi: 10.1039/c3cp43988g.
In this work we demonstrate that freely oriented individual gold nanorods (GNRs) can be used for sensing variations of the refractive index at the interface between two dielectric media. Both the elastic scattering and the luminescence signal of individual GNRs have been used to characterize the dielectric medium surrounding the particles. The scattering signal depends strongly on the distance from the focusing interface and the refractive index mismatch at the focusing interface, while the luminescence signal is only influenced by the last parameter. We used radially and azimuthally polarized light as an excitation source to directly determine the orientation of individual gold nanorods embedded within a dielectric medium.
在这项工作中，我们证明了自由取向的单个金纳米棒（GNR）可用于感测两个介电介质界面处折射率的变化。单个 GNR 的弹性散射和发光信号都已被用于表征颗粒周围的介电介质。散射信号强烈依赖于聚焦界面的距离和聚焦界面处的折射率失配，而发光信号仅受最后一个参数的影响。我们使用径向和角向偏振光作为激发源，直接确定嵌入介电介质中的单个金纳米棒的取向。
