Total Internal Reflection-Based Extinction Spectroscopy of Single Nanoparticles

被引：28

作者：

Li, Meng ^{[1
]}

Yuan, Tinglian ^{[1
]}

Jiang, Yingyan ^{[1
]}

Sun, Linlin ^{[1
]}

Wei, Wei ^{[1
]}

Chen, Hong-Yuan ^{[1
]}

Wang, Wei ^{[1
]}

机构：

[1] Nanjing Univ, State Key Lab Analyt Chem Life Sci, Sch Chem & Chem Engn, Nanjing 210023, Jiangsu, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2019年 / 58卷 / 02期

基金：

中国国家自然科学基金;

关键词：

extinction spectroscopy; nanoparticles; single nanoparticle spectroscopy; total internal reflection; PLASMON RESONANCE; ABSORPTION-SPECTROSCOPY; OPTICAL-ABSORPTION; MICROSCOPY;

D O I：

10.1002/anie.201810324

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Herein we report a reflection-mode total internal reflection microscopy (TIRM) to measure the extinction spectrum of individual dielectric, plasmonic, or light-absorbing nanoparticles, and to differentiate absorption and scattering components from the total optical output. These capabilities were enabled via illuminating the sample with evanescent wave of which the lightpath length was comparable with the size of single nanoparticles, leading to a dramatically improved reflectance change (Delta I/I-0) up to tens of percent. It was further found that scattering and absorption of light contributed to bright and dark centroids, respectively, in the optical patterns of single nanoparticles, allowing to distinguish scattering and absorption components from the extinction spectrum by the use of an appropriate image processing method. In addition, wide-field feature of TIRM enabled the studies on tens of nanoparticles simultaneously with gentle illumination.

引用

页码：572 / 576

页数：5

共 42 条

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