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Article Dans Une Revue Nature Communications Année : 2021

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

Résumé

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.

Domaines

Matériaux
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Dates et versions

hal-03334798 , version 1 (05-09-2021)

Identifiants

Citer

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, 2021, 12 (1), ⟨10.1038/s41467-021-22158-4⟩. ⟨hal-03334798⟩
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