A scanning microscope employing localized surface-plasmon-polaritons as a sensing probe
A scanning microscope employing localized surface-plasmon-polaritons as a sensing probe
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DOI：
10.1016/s0030-4018(00)00794-x
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发表时间：
2000-08-01
影响因子：
2.4
通讯作者：
Knoll, W
中科院分区：
文献类型：
--
作者：
Kano, H;Knoll, W
我们报告的微观技术采用局部激发的表面等离子体激元（SPPs）作为传感探头。用聚焦激光束在金属表面上激发局部化的表面等离子体，观察反射光的傅里叶光谱，以测量激发表面等离子体的传播常数。利用SPP传播常数与沉积在金属表面上的样品折射率之间的关系，我们确定了局部折射率。我们基于这一概念开发了一个样品扫描显微镜，并观察分散在银表面上的微粒。我们的实验结果表明，1.5 μ m或更好的分辨率，这是以前没有达到。(C)出版社：Elsevier Science B.V.
We report on a microscopic technique employing locally excited surface-plasmon-polaritons (SPPs) as the sensing probe. The localized SPPs are excited by a focused laser beam on a metallic surface and the Fourier spectrum of the reflected Light is observed in order to measure the propagation constant of the excited SPPs. By using the well-known relationship between the propagation constant of SPP and the refractive-index of a sample deposited onto the metal surface, we determine the local refractive-index. We develop a sample scanning microscope based on this concept and observe dispersed micro-particles on a silver surface. Our experimental results show 1.5 mu m or better resolution, which has been not achieved before. (C) 2000 Published by Elsevier Science B.V.