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Proceedings Paper

Nematic liquid crystals used to control photo-thermal effects in gold nanoparticles
Author(s): Luigia Pezzi; Luciano De Sio; Giovanna Palermo; Alessandro Veltri; Tiziana Placido; Maria Lucia Curri; Nelson Tabiryan; Cesare Umeton
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Paper Abstract

We report on photo-thermal effects observed in gold nanoparticles (GNPs) dispersed in Nematic Liquid Crystals (NLCs). Under a suitable optical radiation, GNPs exhibit a strong light absorption/scattering; the effect depends on the refractive index of the medium surrounding the nanoparticles, which can be electrically or optically tuned. In this way, the system represents an ideal nano-source of heat, remotely controllable by light to adjust the temperature at the nanoscale. Photo-induced temperature variations in GNPs dispersed in NLCs have been investigated by implementing a theoretical model based on the thermal heating equation applied to an anisotropic medium; theoretical predictions have been compared with results of experiments carried out in a NLC medium hosting GNPs. Both theory and experiments represent a step forward to understand the physics of heat production at the nanoscale, with applications that range from photonics to nanomedicine.

Paper Details

Date Published: 7 March 2016
PDF: 9 pages
Proc. SPIE 9769, Emerging Liquid Crystal Technologies XI, 97690C (7 March 2016); doi: 10.1117/12.2216201
Show Author Affiliations
Luigia Pezzi, Univ. della Calabria (Italy)
Luciano De Sio, BEAM Engineering for Advanced Measurements Co. (United States)
Giovanna Palermo, Univ. della Calabria (Italy)
Alessandro Veltri, Univ. San Francisco de Quito (Ecuador)
Tiziana Placido, Univ. degli Studi di Bari (Italy)
Maria Lucia Curri, CNR-Istituto per i Processi Chimici e Fisici (Italy)
Nelson Tabiryan, BEAM Engineering for Advanced Measurements Co. (United States)
Cesare Umeton, Univ. della Calabria (Italy)

Published in SPIE Proceedings Vol. 9769:
Emerging Liquid Crystal Technologies XI
Liang-Chy Chien; Dick J. Broer; Hirotsugu Kikuchi; Nelson V. Tabiryan, Editor(s)

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