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

Authors
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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