Tracking the Rotational Dynamics of Single Nanorods with Surface Plasmon Resonance Microscopy
作者单位：School of Chemistry and Chemical EngineeringNanjing University
会议名称：《第二十届全国光散射学术会议（CNCLS20）》
会议日期：2019年
学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
关 键 词：SPPs PSF surface plasmon resonance microscopy nanomotor
摘 要：Objective-based surface plasmon resonance microscopy（SPRM） is a wide-field imaging technique that measures the dielectric constant of single nanoparticles based on its interaction with surface plasmon polaritons（SPPs） [1].Because the image contrast of single nanoparticle is dependent on its dielectric constant,a physical property that applies to any material,SPRM is thus suitable for studying all kinds of *** shows a wave-like point spread function（PSF） containing parabolic tails [2].The PSF is determined by the metal film,wavelength and angle of incident light,refractive index of surrounding *** complexity of the wave-like pattern hampered the quantitative interpretation on the PSF of *** applying a 2-dimensional Fourier transform to such patterns,two adjacent rings were observed in the frequency domain.A ring fitting method was then developed to extract geometrical features and to connect these features with several experimental *** addition,when a nanorod takes a non-perpendicular orientation to the SPPs,the wave-like pattern becomes *** dependence of the morphology and orientation of a nano-object on its SPRM image offers a novel technique for studying the rotational dynamics of anisotropic nanomaterials with arbitrary chemical *** proposed an angular spectrum approach to extract the orientation of single CdS nanorods from its SPRM *** was found that the asymmetrical wave-like SPRM image resulted in a peak in its angular spectrum in the frequency *** between the peak angle and the geometrical orientation of nanorod was validated by both in situ scanning electron microscope characterizations and theoretical *** results of real-time monitoring uncovered an accelerated rotation of single CdS nanorods during photocatalysis,which was strong enough to trigger the rotation of a previously-fixed nanocatalyst [3].