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Measuring 3D orientation of nanocrystals via polarized luminescence of rare-earth dopants

Abstract : Abstract Orientation of nanoscale objects can be measured by examining the polarized emission of optical probes. To retrieve a three-dimensional (3D) orientation, it has been essential to observe the probe (a dipole) along multiple viewing angles and scan with a rotating analyzer. However, this method requires a sophisticated optical setup and is subject to various external sources of error. Here, we present a fundamentally different approach employing coupled multiple emission dipoles that are inherent in lanthanide-doped phosphors. Simultaneous observation of different dipoles and comparison of their relative intensities allow to determine the 3D orientation from a single viewing angle. Moreover, the distinct natures of electric and magnetic dipoles originating in lanthanide luminescence enable an instant orientation analysis with a single-shot emission spectrum. We demonstrate a straightforward orientation analysis of Eu 3+ -doped NaYF 4 nanocrystals using a conventional fluorescence microscope. Direct imaging of the rod-shaped nanocrystals proved the high accuracy of the measurement. This methodology would provide insights into the mechanical behaviors of various nano- and biomolecular systems.
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https://hal.archives-ouvertes.fr/hal-03334798
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Soumis le : dimanche 5 septembre 2021 - 11:00:50
Dernière modification le : samedi 4 décembre 2021 - 03:59:02
Archivage à long terme le : : lundi 6 décembre 2021 - 18:16:05

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s41467-021-22158-4.pdf
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Jeongmo Kim, Reinaldo Chacón, Zijun Wang, Eric Larquet, Khalid Lahlil, et al.. Measuring 3D orientation of nanocrystals via polarized luminescence of rare-earth dopants. Nature Communications, Nature Publishing Group, 2021, 12 (1), ⟨10.1038/s41467-021-22158-4⟩. ⟨hal-03334798⟩

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