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Point Spread Function of Objective-Based Surface Plasmon Resonance Microscopy
Analytical Chemistry ( IF 7.4 ) Pub Date : 2018-07-02 00:00:00 , DOI: 10.1021/acs.analchem.8b02800
Yingyan Jiang 1 , Wei Wang 1
Affiliation  

Objective-based surface plasmon resonance microscopy (SPRM) is a novel optical imaging technique that can map the spatial distribution of a local refractive index based on propagating surface plasmon polaritons (SPPs). Different from some other optical microscopy that shows a dot-like point spread function (PSF), a nanosized object appears as a wave-like pattern containing parabolic tails in SPRM. The geometrical complexity of the wave-like pattern hampered the quantitative interpretation of the PSF of SPRM. Previous studies have shown that two adjacent rings were obtained in the frequency domain by applying a two-dimensional Fourier transform to such patterns. In the present work, a ring-fitting method was developed to extract geometrical features out of the dual rings and to connect these features with several experimental parameters. It was found that the radius of ring equaled to the wavevector of SPPs. Its orientation revealed the propagation direction of SPPs. The coordinate distance of the center of ring gave the parallel component of the wavevector of the incident light, which was regulated by the incident angle. The ring-broadening factor reflected the propagation length of SPPs in a reciprocal relationship. Systematical and quantitative interpretations in the frequency domain not only advanced the basic understanding on the PSF of SPRM but also opened up the possibility to utilize these frequency-domain features for detection and sensing purposes in future.

中文翻译:

基于物镜的表面等离子体共振显微镜的点扩散功能

基于物镜的表面等离振子共振显微镜(SPRM)是一种新颖的光学成像技术,可基于传播的表面等离激元极化子(SPPs)绘制局部折射率的空间分布。与其他一些显示点状点扩散函数(PSF)的光学显微镜不同,纳米尺寸的物体在SPRM中表现为包含抛物线形尾巴的波状图案。波形图案的几何复杂性妨碍了SPRM的PSF的定量解释。先前的研究表明,通过将二维傅立叶变换应用于此类模式,可以在频域中获得两个相邻的环。在目前的工作中,开发了一种环拟合方法以从双环中提取几何特征并将这些特征与几个实验参数联系起来。发现环的半径等于SPP的波矢。其方向揭示了SPP的传播方向。环中心的坐标距离给出了入射光波矢量的平行分量,该分量由入射角调节。环扩展因子以倒数关系反映了SPP的传播长度。频域中的系统和定量解释不仅提高了对SPRM的PSF的基本理解,而且为将来将这些频域特征用于检测和感测目的提供了可能性。环中心的坐标距离给出了入射光波矢量的平行分量,该分量由入射角调节。环扩展因子以倒数关系反映了SPP的传播长度。频域中的系统和定量解释不仅提高了对SPRM的PSF的基本理解,而且为将来将这些频域特征用于检测和感测目的提供了可能性。环中心的坐标距离给出了入射光波矢量的平行分量,该分量由入射角调节。环扩展因子以倒数关系反映了SPP的传播长度。频域中的系统和定量解释不仅提高了对SPRM的PSF的基本理解,而且为将来将这些频域特征用于检测和感测目的提供了可能性。
更新日期:2018-07-02
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