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Issue 8, 2020
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Enantioselective manipulation of single chiral nanoparticles using optical tweezers

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Abstract

We put forward an enantioselective method for chiral nanoparticles using optical tweezers. We demonstrate that the optical trapping force in a typical, realistic optical tweezing setup with circularly-polarized trapping beams is sensitive to the chirality of core–shell nanoparticles, allowing for efficient enantioselection. It turns out that the handedness of the trapped particles can be selected by choosing the appropriate circular polarization of the trapping beam. The chirality of each individual trapped nanoparticle can be characterized by measuring the rotation of the equilibrium position under the effect of a transverse Stokes drag force. We show that the chirality of the shell gives rise to an additional twist, leading to a strong enhancement of the optical torque driving the rotation. Both methods are shown to be robust against variations of size and material parameters, demonstrating that they are particularly useful in (but not restricted to) several situations of practical interest in chiral plasmonics, where enantioselection and characterization of single chiral nanoparticles, each and every one with its unique handedness and optical properties, are in order. In particular, our method could be employed to unveil the chiral response arising from disorder in individual plasmonic raspberries, synthesized by close-packing a large number of metallic nanospheres around a dielectric core.

Graphical abstract: Enantioselective manipulation of single chiral nanoparticles using optical tweezers

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Supplementary files

Article information


Submitted
15 Nov 2019
Accepted
08 Feb 2020
First published
11 Feb 2020

Nanoscale, 2020,12, 5031-5037
Article type
Paper

Enantioselective manipulation of single chiral nanoparticles using optical tweezers

R. Ali, F. A. Pinheiro, R. S. Dutra, F. S. S. Rosa and P. A. Maia Neto, Nanoscale, 2020, 12, 5031
DOI: 10.1039/C9NR09736H

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