Department of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, 100871 Beijing, China.
Nanoscale. 2012 Jun 7;4(11):3359-64. doi: 10.1039/c2nr12137a. Epub 2012 May 8.
We proposed the estimation of the plasmonic near-field volume in the vicinity of a single gold nanoparticle, and observed experimentally the near-field variation due to a change in the polarization of the illuminating light. Under total-internal-reflection illumination, the plasmonic near-field volume is varied by tuning the polarization of the excitation light. The variation in the optical near-field around a single gold nanoparticle was simulated theoretically with a finite-difference time domain method, and was characterized experimentally employing a fluorescence correlation spectroscopy technique. The experimental results are in agreement quantitatively with the theoretical analysis. These results are highly relevant to important efforts to clarify the interaction between the emitter and the plasmonic antenna, and should be helpful in developing a plasmonic-enhanced total-internal-reflection fluorescence imaging microscope.
我们提出了对单个金纳米粒子附近等离子体近场体积的估计，并通过实验观察到由于照明光偏振的变化而导致的近场变化。在全内反射照明下，通过调节激发光的偏振，可以改变等离子体近场体积。利用有限差分时域方法对单个金纳米粒子周围的光学近场进行了理论模拟，并采用荧光相关光谱技术进行了实验表征。实验结果与理论分析在定量上是一致的。这些结果与阐明发射器与等离子体天线之间相互作用的重要努力密切相关，并且应该有助于开发等离子体增强全内反射荧光成像显微镜。
