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Single-particle spectroscopy and defocused imaging of anisotropic gold nanorods by total internal reflection scattering microscopy.
Analyst ( IF 4.2 ) Pub Date : 2020-07-14 , DOI: 10.1039/d0an01071e
Jaeran Lee 1 , Geun Wan Kim , Ji Won Ha
Affiliation  

Total internal reflection scattering (TIRS) microscopy is based on evanescent field illumination at the interface. Compared to conventional dark-field (DF) microscopy, TIRS microscopy has been rarely applied to the spectroscopic studies of plasmonic nanoparticles. Furthermore, there has been no detailed correlation study on the characteristic optical properties of single gold nanorods (AuNRs) obtained by DF and TIRS microscopy. Herein, through a single-particle correlation study, we compare the spectroscopic and defocusing properties of single AuNRs obtained by DF and TIRS microscopy, which have different illumination geometries. Compared to DF microscopy, TIRS microscopy yielded almost identical single-particle scattering spectra and localized surface plasmon resonance (LSPR) linewidth for the same in-focus AuNRs. However, TIRS microscopy, which is based on evanescent field illumination at the interface, provided a higher signal-to-noise ratio in the defocused image of the same AuNRs compared to DF microscopy. Furthermore, the heavily reduced background noise clarified the defocused scattering patterns of TIRS microscopy, which provided more detailed and accurate angular information than that obtained by conventional DF microscopy.

中文翻译:

通过全内反射散射显微镜对各向异性金纳米棒的单粒子光谱和散焦成像。

全内反射散射(TIRS)显微镜基于界面处的渐逝场照明。与传统的暗场(DF)显微镜相比,TIRS显微镜很少用于等离子体纳米颗粒的光谱研究。此外,还没有关于通过DF和TIRS显微镜获得的单个金纳米棒(AuNRs)的特征光学性质的详细相关研究。本文中,通过单颗粒相关性研究,我们比较了通过DF和TIRS显微镜获得的具有不同照明几何形状的单个AuNRs的光谱和散焦特性。与DF显微镜相比,TIRS显微镜对于相同的焦点AuNRs产生几乎相同的单粒子散射光谱和局部表面等离子体共振(LSPR)线宽。但是,TIRS显微镜检查 与DF显微镜相比,它基于界面处的渐逝场照明,在相同AuNRs的散焦图像中提供了更高的信噪比。此外,大大降低的背景噪声使TIRS显微镜的散焦散射图更加清晰,与传统的DF显微镜相比,它提供了更详细和准确的角度信息。
更新日期:2020-09-14
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