光学学报, 2018, 38 (6): 0624001, 网络出版: 2018-07-09
基于倏逝波界面散射的单个纳米颗粒无标记成像 下载: 1068次
Single Nanoparticle Label-Free Imaging Based on Evanescent Wave In-Plane Scattering
表面光学 无标记成像 单个纳米颗粒 倏逝波界面散射 全内反射 表面等离激元 optics at surfaces label-free imaging single nanoparticle evanescent wave in-plane scattering total internal reflection surface plasmon polaritons
摘要
介绍了一种利用倏逝波界面散射对单个纳米颗粒进行无标记成像的方法。分别使用全内反射(TIR)倏逝波与表面等离激元(SPPs)两种倏逝波与单个纳米颗粒相互作用,激发纳米颗粒极化并发生散射,所产生的界面散射与入射倏逝波发生干涉,形成了纳米颗粒极化场与抛物线形干涉条纹的特征成像。分别对直径为500,200,100 nm的聚苯乙烯颗粒进行了单个纳米颗粒无标记成像。比较了两种倏逝波界面散射对单个纳米颗粒成像结果,发现表面等离激元界面散射成像中的单个纳米颗粒极化强度约是全内反射极化强度的10倍,并且接近于暗场成像。因此,表面等离激元界面散射对单个纳米颗粒无标记成像具有更高灵敏度。所提单个纳米颗粒无标记成像方法可以拓展到病毒检测、生物单分子成像等领域。
Abstract
A method for label-free imaging to single nanoparticle by evanescent wave in-plane scattering is presented. Using the two evanescent waves of total internal reflection (TIR) evanescent wave and surface plasmon polaritons (SPPs) to interact with a single nanoparticle, respectively, which excites the nanoparticle polarization and scatter. Generated interfacial scattering is interfered with incident evanescent wave, which forms a characteristic imaging of the polarization field of the nanoparticles and the parabolic interference fringes. Single nanoparticle label-free imaging is performed on three polystyrene nanoparticles with the diameters of 500, 200, 100 nm. The imaging results of two evanescent wave in-plane scattering on single nanoparticle are compared. It indicates that the nanoparticle polarization of SPPs in-plane scattering is approximately 10 times stronger than that of TIR in-plane scattering and close to dark field imaging. As a result, SPPs in-plane scattering manifests the better sensitivity to label-free single nanoparticle imaging. This single nanoparticle label-free imaging method can be extended to areas such as virus detection and single bio-molecule imaging.
江丽雯, 孙旭晴, 刘虹遥, 谌雅琴, 熊伟, 张朝前, 路鑫超. 基于倏逝波界面散射的单个纳米颗粒无标记成像[J]. 光学学报, 2018, 38(6): 0624001. Liwen Jiang, Xuqing Sun, Hongyao Liu, Yaqin Chen, Wei Xiong, Chaoqian Zhang, Xinchao Lu. Single Nanoparticle Label-Free Imaging Based on Evanescent Wave In-Plane Scattering[J]. Acta Optica Sinica, 2018, 38(6): 0624001.