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


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 photogenerated heat. A fine control of the amount of generated heat is thus possible by stretching the initially isotropic sample of only few percents. Due to the anisotropy of the stretching procedure, the plasmon band shift and thus the heat generation results to be 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 ad under stretching, show a relative increase of temperature that is in good quantitativen 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 promises 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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Publication details

The article was received on 24 May 2018, accepted on 01 Aug 2018 and first published on 01 Aug 2018

Article type: Paper
DOI: 10.1039/C8NR04228D
Citation: Nanoscale, 2018, Accepted Manuscript
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    Flexible thermo-plasmonics: an opto-mechanical control of the heat generated at the nanoscale

    G. Palermo, U. Cataldi, A. Condello, R. Caputo, T. Bürgi, C. Umeton and A. De Luca, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04228D

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