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Brownian fluctuations of an optically rotated nanorod
Department of Physics, Chalmers University of Technology, Göteborg, Sweden; Department of Physics, Institute for Advanced Studies in Basic Sciences, Zanjan, Iran.
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.ORCID iD: 0000-0003-2161-5103
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
Örebro University, School of Science and Technology. Department of Physics, Chalmers University of Technology, Göteborg, Sweden.ORCID iD: 0000-0002-2110-3071
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2017 (English)In: Optica, ISSN 2334-2536, Vol. 4, no 7, p. 746-751Article in journal (Refereed) Published
Abstract [en]

Gold nanorods can be optically trapped in aqueous solution and forced to rotate at kilohertz rates by circularly polarized laser light. This enables detailed investigations of local environmental parameters and processes, such as medium viscosity and nanoparticle-molecule reactions. Future applications may include nanoactuation and single-cell analysis. However, the influence of photothermal heating on the nanoparticle dynamics needs to be better understood in order to realize widespread and quantitative use. Here we analyze the hot Brownian motion of a rotating gold nanorod trapped in two dimensions by an optical tweezers using experiments and stochastic simulations. We show that, for typical settings, the effective rotational and translational Brownian temperatures are drastically different, being closer to the nanorod surface temperature and ambient temperature, respectively. Further, we show that translational dynamics can have a non-negligible influence on the rotational fluctuations due to the small size of a nanorod in comparison to the focal spot. These results are crucial for the development of gold nanorods into generic and quantitative optomechanical sensor and actuator elements. (C) 2017 Optical Society of America

Place, publisher, year, edition, pages
Optics Info Base, Optical Society of America, 2017. Vol. 4, no 7, p. 746-751
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:oru:diva-59307DOI: 10.1364/OPTICA.4.000746ISI: 000406093300011Scopus ID: 2-s2.0-85025121417OAI: oai:DiVA.org:oru-59307DiVA, id: diva2:1136171
Funder
Knut and Alice Wallenberg Foundation
Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2018-02-20Bibliographically approved

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Johansson, Peter

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