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Probing Photothermal Effects on Optically Trapped Gold Nanorods by Simultaneous Plasmon Spectroscopy and Brownian Dynamics Analysis
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
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2017 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 11, no 10, p. 10053-10061Article in journal (Refereed) Published
Abstract [en]

Plasmonic gold nanorods are prime candidates for a variety of biomedical, spectroscopy, data storage, and sensing applications. It was recently shown that gold nanorods optically trapped by a focused circularly polarized laser beam can function as extremely efficient nanoscopic rotary motors. The system holds promise for-applications ranging from nanofluidic flow control and nanorobotics to biomolecular actuation and analysis. However, to fully exploit this potential, one needs to be able to control and understand heating effects associated with laser trapping. We investigated photothermal heating of individual rotating gold nanorods by simultaneously probing their localized surface plasmon resonance spectrum and rotational Brownian dynamics over extended periods of time. The data reveal an extremely slow nanoparticle reshaping process, involving migration of the order of a few hundred atoms per minute, for moderate laser powers and a trapping wavelength close to plasmon resonance. The plasmon spectroscopy and Brownian analysis allows for separate temperature estimates based on the refractive index and the viscosity of the water surrounding a trapped nanorod. We show that both measurements yield similar effective temperatures, which correspond to the actual temperature at a distance of the order 10-15 nm from the particle surface. Our results shed light on photothermal processes on the nanoscale and will be useful in evaluating the applicability and performance of nanorod motors and optically heated nanoparticles for a variety of applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 11, no 10, p. 10053-10061
Keywords [en]
photothermal effects, gold nanorod, optical tweezers, nanomotors, thermal reshaping, Brownian dynamics
National Category
Atom and Molecular Physics and Optics Other Chemistry Topics
Identifiers
URN: urn:nbn:se:oru:diva-62784DOI: 10.1021/acsnano.7b04302ISI: 000413992800048PubMedID: 28872830Scopus ID: 2-s2.0-85033232169OAI: oai:DiVA.org:oru-62784DiVA, id: diva2:1159739
Funder
Knut and Alice Wallenberg FoundationSwedish Foundation for Strategic Research
Note

Funding Agency:

Chalmers Area of Advance Nanoscience and Nanotechnology

Available from: 2017-11-23 Created: 2017-11-23 Last updated: 2017-11-23Bibliographically approved

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Johansson, Peter

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