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Enhanced thermo-optical response by means of anapole excitation

Abstract: High refractive index (HRI) dielectric nanostructures offer a versatile platform to control the light-matter interaction at the nanoscale as they can easily support electric and magnetic modes with low losses. An additional property that makes them extraordinary is that they can support low radiative modes, so-called anapole modes. In this work, we propose a spectrally tunable anapole nanoheater based on the use of a dielectric anapole resonator. We show that a gold ring nanostructure, a priori nonresonant, can be turned into a resonant unit by just filling its hole with an HRI material supporting anapole modes, resulting in a more efficient nanoheater able to amplify the photothermal response of the bare nanoring. As proof of concept, we perform a detailed study of the thermoplasmonic response of a gold nanoring used as heating source and a silicon disk, designed to support anapole modes, located in its center acting as an anapolar resonator. Furthermore, we utilize the anapole excitation to easily shift the thermal response of these structures from the shortwave infrared range to the near-infrared range.

 Autoría: González-Colsa J., Olarte-Plata J.D., Bresme F., Albella P.,

 Fuente: Journal of Physical Chemistry Letters, 2022, 13(26), 6230-6235

Editorial: American Chemical Society

 Fecha de publicación: 30/06/2022

Nº de páginas: 6

Tipo de publicación: Artículo de Revista

 DOI: 10.1021/acs.jpclett.2c00870

ISSN: 1948-7185

Proyecto español: PGC2018-096649-B-I

Url de la publicación: https://doi.org/10.1021/acs.jpclett.2c00870