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Flexible thermo-plasmonics: an opto-mechanical control of the heat generated at the nanoscale

Palermo, Giovanna
Condello, Antonio
Caputo, Roberto
Umeton, Cesare
De Luca, Antonio
Published in Nanoscale. 2018, vol. 10, no. 35, p. 16556-16561
Abstract The opto-mechanical control of the heat generated by an amorphous arrangement of homogenously distributed gold nanoparticles (AuNPs), excited by an external laser source, is investigated. Application of a macroscopic mechanical strain to the biocompatible elastomeric tape supporting the particles leads to a nanoscale modification of their mutual inter-distance. The resulting strong variation of the particles near-field coupling gives rise to a macroscopic variation of the photo-generated heat. A fine control of the amount of generated heat is thus possible by stretching the initially isotropic sample by only a few percent. Due to the anisotropy of the stretching procedure, the plasmon band shift and thus the heat generation becomes strongly polarization-dependent. A model of the system based on Mie theory is implemented by using a finite element method. Under optical excitation, two configurations of AuNPs, representing the same cluster of particles at rest and under stretching, show a relative increase of temperature that is in good quantitative agreement with experimental data, if normalized to the number of involved particles. This system realizes for the first time an opto-mechanical control of the temperature at the nanoscale which holds promise for the development of optically-active thermal patches, usable for biomedical applications, and flexible platforms for microfluidics and lab-on-a-chip devices.
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Other version: http://xlink.rsc.org/?DOI=C8NR04228D
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PALERMO, Giovanna et al. Flexible thermo-plasmonics: an opto-mechanical control of the heat generated at the nanoscale. In: Nanoscale, 2018, vol. 10, n° 35, p. 16556-16561. doi: 10.1039/C8NR04228D https://archive-ouverte.unige.ch/unige:142037

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Deposited on : 2020-09-28

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