Banville Frederic A, Söllradl Thomas, Zermatten Pierre-Jean, Grandbois Michel, Charette Paul G
Opt Lett. 2015 Apr 1;40(7):1165-8. doi: 10.1364/OL.40.001165.
In high-resolution surface plasmon (SPR) imaging, lateral resolution is limited along the direction of plasmon propagation by the longitudinal decay length. Though SPR systems can achieve sub-micrometer resolution, the decay length causes a degradation in the images in the direction of plasmon propagation akin to a blurring artifact, with ringing along resonant to nonresonant transition edges. We present a method to significantly reduce this effect based on combining images of a sample acquired with distinct guided-mode propagation directions. As SPR is a special case of the class of optical structures known as metal-clad waveguides (MCWG) that are also affected by the decay length, this work is broadly applicable.
在高分辨率表面等离子体共振（SPR）成像中，沿等离子体传播方向的横向分辨率受纵向衰减长度的限制。尽管SPR系统能够实现亚微米级分辨率，但衰减长度会导致图像在等离子体传播方向上出现退化，类似于模糊伪像，在共振到非共振过渡边缘处伴有振铃现象。我们提出了一种基于组合以不同导模传播方向获取的样品图像来显著降低这种效应的方法。由于SPR是被称为金属包覆波导（MCWG）的一类光学结构中的特殊情况，而这类结构也会受到衰减长度的影响，因此这项工作具有广泛的适用性。
