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26 April 2024 |
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Article overview
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Tracking Brownian motion in three dimensions and characterization of individual nanoparticles using a fiber-based high-finesse microcavity | | Larissa Kohler
; Matthias Mader
; Christian Kern
; Martin Wegener
; David Hunger
; | | Date: |
27 Aug 2020 | | Abstract: | The dynamics of nanosystems in solution contains a wealth of information with
relevance for diverse fields ranging from materials science to biology and
biomedical applications. When nanosystems are marked with fluorophores or
strong scatterers, it is possible to track their position and reveal internal
motion with high spatial and temporal resolution. However, markers can be
toxic, expensive, or change the object’s intrinsic properties. Here, we
simultaneously measure dispersive frequency shifts of three transversal modes
of a high-finesse microcavity to obtain the three-dimensional path of unlabeled
SiO$_2$ nanospheres with $300,mathrm{mu}$s temporal and down to $8,$nm
spatial resolution. This allows us to quantitatively determine properties such
as the polarizability, hydrodynamic radius, and effective refractive index. The
fiber-based cavity is integrated in a direct-laser-written microfluidic device
that enables the precise control of the fluid with ultra-small sample volumes.
Our approach enables quantitative nanomaterial characterization and the
analysis of biomolecular motion at high bandwidth. | | Source: | arXiv, 2008.12173 | | Services: | Forum | Review | PDF | Favorites | |
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