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Visualization of Optical Vortex Forces Acting on Au Nanoparticles Transported in Nanofluidic Channels

[Image: see text] The optical manipulation of nanoscale objects via structured light has attracted significant attention for its various applications, as well as for its fundamental physics. In such cases, the detailed behavior of nano-objects driven by optical forces must be precisely predicted and...

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Autores principales: Nakajima, Kichitaro, Tsujimura, Tempei, Doi, Kentaro, Kawano, Satoyuki
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8792943/
https://www.ncbi.nlm.nih.gov/pubmed/35097262
http://dx.doi.org/10.1021/acsomega.1c04855
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author Nakajima, Kichitaro
Tsujimura, Tempei
Doi, Kentaro
Kawano, Satoyuki
author_facet Nakajima, Kichitaro
Tsujimura, Tempei
Doi, Kentaro
Kawano, Satoyuki
author_sort Nakajima, Kichitaro
collection PubMed
description [Image: see text] The optical manipulation of nanoscale objects via structured light has attracted significant attention for its various applications, as well as for its fundamental physics. In such cases, the detailed behavior of nano-objects driven by optical forces must be precisely predicted and controlled, despite the thermal fluctuation of small particles in liquids. In this study, the optical forces of an optical vortex acting on gold nanoparticles (Au NPs) are visualized using dark-field microscopic observations in a nanofluidic channel with strictly suppressed forced convection. Manipulating Au NPs with an optical vortex allows the evaluation of the three optical force components, namely, gradient, scattering, and absorption forces, from the in-plane trajectory. We develop a Langevin dynamics simulation model coupled with Rayleigh scattering theory and compare the theoretical results with the experimental ones. Experimental results using Au NPs with diameters of 80–150 nm indicate that our experimental method can determine the radial trapping stiffness and tangential force with accuracies on the order of 0.1 fN/nm and 1 fN, respectively. Our experimental method will contribute to broadening not only applications of the optical-vortex manipulation of nano-objects, but also investigations of optical properties on unknown nanoscale materials via optical force analyses.
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spelling pubmed-87929432022-01-28 Visualization of Optical Vortex Forces Acting on Au Nanoparticles Transported in Nanofluidic Channels Nakajima, Kichitaro Tsujimura, Tempei Doi, Kentaro Kawano, Satoyuki ACS Omega [Image: see text] The optical manipulation of nanoscale objects via structured light has attracted significant attention for its various applications, as well as for its fundamental physics. In such cases, the detailed behavior of nano-objects driven by optical forces must be precisely predicted and controlled, despite the thermal fluctuation of small particles in liquids. In this study, the optical forces of an optical vortex acting on gold nanoparticles (Au NPs) are visualized using dark-field microscopic observations in a nanofluidic channel with strictly suppressed forced convection. Manipulating Au NPs with an optical vortex allows the evaluation of the three optical force components, namely, gradient, scattering, and absorption forces, from the in-plane trajectory. We develop a Langevin dynamics simulation model coupled with Rayleigh scattering theory and compare the theoretical results with the experimental ones. Experimental results using Au NPs with diameters of 80–150 nm indicate that our experimental method can determine the radial trapping stiffness and tangential force with accuracies on the order of 0.1 fN/nm and 1 fN, respectively. Our experimental method will contribute to broadening not only applications of the optical-vortex manipulation of nano-objects, but also investigations of optical properties on unknown nanoscale materials via optical force analyses. American Chemical Society 2022-01-10 /pmc/articles/PMC8792943/ /pubmed/35097262 http://dx.doi.org/10.1021/acsomega.1c04855 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Nakajima, Kichitaro
Tsujimura, Tempei
Doi, Kentaro
Kawano, Satoyuki
Visualization of Optical Vortex Forces Acting on Au Nanoparticles Transported in Nanofluidic Channels
title Visualization of Optical Vortex Forces Acting on Au Nanoparticles Transported in Nanofluidic Channels
title_full Visualization of Optical Vortex Forces Acting on Au Nanoparticles Transported in Nanofluidic Channels
title_fullStr Visualization of Optical Vortex Forces Acting on Au Nanoparticles Transported in Nanofluidic Channels
title_full_unstemmed Visualization of Optical Vortex Forces Acting on Au Nanoparticles Transported in Nanofluidic Channels
title_short Visualization of Optical Vortex Forces Acting on Au Nanoparticles Transported in Nanofluidic Channels
title_sort visualization of optical vortex forces acting on au nanoparticles transported in nanofluidic channels
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8792943/
https://www.ncbi.nlm.nih.gov/pubmed/35097262
http://dx.doi.org/10.1021/acsomega.1c04855
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