Program for Nanomedical Science and Technology, Yonsei University, Seoul, Korea 120-749.
Opt Lett. 2009 Dec 15;34(24):3905-7. doi: 10.1364/OL.34.003905.
We investigate optimum plasmon-enhanced total-internal-reflection fluorescence imaging by metallic thin films and nanostructures. The enhancement is based on the mismatch between the conditions of plasmon resonance and maximal near-field intensity. We have calculated plasmon-associated near-field and far-field characteristics using rigorous coupled-wave analysis. Near-field intensity was experimentally measured with fluorescent beads on silver thin films, nanogratings, and nanoislands. The results for nanostructure-based plasmon excitation confirm that momentum mismatching when exciting plasmons can increase the consequent emission of fluorescence substantially. The improvement can be critical depending on the specific structure.
我们研究了通过金属薄膜和纳米结构实现最佳等离子体增强全内反射荧光成像。这种增强基于等离子体共振条件和最大近场强度之间的不匹配。我们使用严格耦合波分析计算了与等离子体相关的近场和远场特性。使用银薄膜、纳米光栅和纳米岛的荧光珠实验测量了近场强度。基于纳米结构的等离子体激发的结果证实，当激发等离子体时，动量失配可以显著增加随后的荧光发射。具体结构的改进可以是关键的。
