Orientation Effects on Plasmonic Heating of Near-Infrared Colloidal Gold Nanostructures
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Orientation Effects on Plasmonic Heating of Near-Infrared Colloidal Gold Nanostructures Sajid Farooq1,2 · Diego Rativa1,3,4 · Renato E. de Araujo2 Received: 2 October 2019 / Accepted: 10 March 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Photothermal therapy assisted by plasmonic nanostructure relies on the absorption of light energy by the metallic nanoparticle. The manifestation of a rational use of plasmonic-assisted superficial laser thermal therapy procedures requires the analyses of the thermoplasmonic behavior of colloidal nanostructures in random orientation. A quantitative analysis of orientation effect on optically heating metallic nanostructures still unrevealed. Here, we evaluate the thermal properties of metallic nanoparticles (SiO2 /Au core-shell particles, Au nanotriangles, Au nanorods, and Au nanocages) irradiated by polarized light. We perform 3D full-wave field analysis to compare absorption properties and temperature rise of these nanoparticles as a function of the nanostructure orientation with respect to applied field polarization. The analysis shows a major variation in joule number of asymmetrical nanostructures (up to 50%) due to orientation effects, which may limit its performance on colloidal photothermal applications. In contrast, the high degree of rotational symmetry of core-shell nanoparticles and nanocages provide greater potential in thermal-assisted phototherapy applications, as their absorption is largely independent (less than 2%) of their orientation in colloid. Our computational results establish new insights for the use of gold nanocages, as a high performance plasmonic structure for thermal applications with colloidal samples. Keywords Gold nanostructures · Thermo-plasmonics · Photothermal therapy · Joule number
Introduction The potential use of colloidal metallic nanostructures has remarklable grown in recent years as advances in nanoscale particle synthesis, promoting an increase in the number of plasmonic applications in various fields like biomedicine, pharmaceutical areas, and solar heat transducers [1–5]. The electromagnetic coupling with the noble metal nanoparticles Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11468-020-01148-0) contains supplementary material, which is available to authorized users. Renato E. de Araujo
[email protected] 1
Institute of Technological Innovation, University of Pernambuco, Recife, Brazil
2
Laboratory of Biomedical Optics and Imaging, Federal University of Pernambuco, Recife, Brazil
3
Polytechnic School of Pernambuco, University of Pernambuco, Recife, PE, Brazil
4
Applied Physics Program, Federal Rural University of Pernambuco, Recife, Brazil
can generate localized surface plasmon resonance (LSPR) effect, which supports strong absorption and scattering of light from visible to near-infrared (NIR) and intense localized field enhancement [6, 7]. The unique and tunable optical properties of plasmonic nanoparticles (NPs) are reliant on thei
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