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

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          Abstract

          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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          Most cited references39

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          Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes

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            The discrete-dipole approximation and its application to interstellar graphite grains

            B. Draine (1988)
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              Optical properties of the metals Al, Co, Cu, Au, Fe, Pb, Ni, Pd, Pt, Ag, Ti, and W in the infrared and far infrared

              Infrared optical constants collected from the literature are tabulated. The data for the noble metals and Al, Pb, and W can be reasonably fit using the Drude model. It is shown that -epsilon1(omega) = epsilon2(omega) approximately omega(2)(p)/(2omega(2)(tau)) at the damping frequency omega = omega(tau). Also -epsilon1(omega(tau)) approximately - (1/2) epsilon1(0), where the plasma frequency is omega(p).
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                Author and article information

                Journal
                ACS Omega
                ACS Omega
                ao
                acsodf
                ACS Omega
                American Chemical Society
                2470-1343
                10 January 2022
                25 January 2022
                : 7
                : 3
                : 2638-2648
                Affiliations
                []Global Center for Medical Engineering and Informatics, Osaka University , Suita, Osaka 565-0871, Japan
                []Graduate School of Engineering Science, Osaka University , Toyonaka, Osaka 560-8531, Japan
                [§ ]Department of Mechanical Engineering, Toyohashi University of Technology , Toyohashi, Aichi 441-8580, Japan
                Author notes
                [* ]Email: kawano@ 123456me.es.osaka-u.ac.jp . Phone: +81 (6)6850 6175. Fax: +81 (6)6850 6175.
                Author information
                https://orcid.org/0000-0003-2644-741X
                https://orcid.org/0000-0002-2663-9369
                Article
                10.1021/acsomega.1c04855
                8792943
                35097262
                c649b04a-45d9-4c1d-bdd6-44cc4e6f6ecf
                © 2022 The Authors. Published by American Chemical Society

                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/).

                History
                : 02 September 2021
                : 23 December 2021
                Funding
                Funded by: Japan Society for the Promotion of Science, doi 10.13039/501100001691;
                Award ID: JP16H06504
                Funded by: Frontier Photonic Sciences Project of the National Institutes of Natural Sciences, doi NA;
                Award ID: 01211901
                Funded by: Core Research for Evolutional Science and Technology, doi 10.13039/501100003382;
                Award ID: JPMJCR1903
                Funded by: Japan Society for the Promotion of Science, doi 10.13039/501100001691;
                Award ID: JP18K13687
                Funded by: Japan Society for the Promotion of Science, doi 10.13039/501100001691;
                Award ID: JP18H05242
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                ao1c04855
                ao1c04855

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