Spectroscopy of individual Brownian nanoparticles in real-time using holographic localization

Individual nanoparticle spectroscopic characterization is fundamental, but challenging in liquids. While confocal selectivity is necessary to isolate a particle in a crowd, Brownian motion constantly offsets the particle from the light collection volume. Here, we present a system able to acquire hol...

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Published inOptics express Vol. 30; no. 24; pp. 43182 - 43194
Main Authors Nguyen, Minh-Chau, Berto, Pascal, Valentino, Fabrice, Kanoufi, Frederic, Tessier, Gilles
Format Journal Article
LanguageEnglish
Published United States Optical Society of America - OSA Publishing 21.11.2022
Subjects
Chemical Physics
Instrumentation and Detectors
Optics
Physics
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Summary:Individual nanoparticle spectroscopic characterization is fundamental, but challenging in liquids. While confocal selectivity is necessary to isolate a particle in a crowd, Brownian motion constantly offsets the particle from the light collection volume. Here, we present a system able to acquire holograms and reconstruct them to precisely determine the 3D position of a particle in real time. These coordinates drive an adaptive system comprising two galvanometric mirrors (x,y, transverse directions) and a tunable lens (z, longitudinal) which redirect light scattered from the corresponding region of space towards the confocal entrance of a spectrometer, thus allowing long spectral investigations on individual, freely-moving particles. A study of the movements and spectra of individual 100 nm Au nanoparticles undergoing two types of aggregations illustrates the possibilities of the method.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.463115