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Anapole modes in hollow nanocuboid dielectric metasurfaces for refractometric sensing

Abstract: This work proposes the use of the refractive index sensitivity of non-radiating anapole modes of high-refractive-index nanoparticles arranged in planar metasurfaces as a novel sensing principle. The spectral position of anapole modes excited in hollow silicon nanocuboids is first investigated as a function of the nanocuboid geometry. Then, nanostructured metasurfaces of periodic arrays of nanocuboids on a glass substrate are designed. The metasurface parameters are properly selected such that a resonance with ultrahigh Q-factor, above one million, is excited at the target infrared wavelength of 1.55µm. The anapole-induced resonant wavelength depends on the refractive index of the analyte superstratum, exhibiting a sensitivity of up to 180 nm/RIU. Such values, combined with the ultrahigh Q-factor, allow for refractometric sensing with very low detection limits in a broad range of refractive indices. Besides the sensing applications, the proposed device can also open new venues in other research fields, such as non-linear optics, optical switches, and optical communications.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Nanomaterials, 2019, 9(1), 30

Editorial: MDPI

 Fecha de publicación: 01/01/2019

Nº de páginas: 13

Tipo de publicación: Artículo de Revista

 DOI: 10.3390/nano9010030

ISSN: 2079-4991

 Proyecto español: TEC2013-47342-C2-2-R

Autoría

ZOGRAFOPOULOS, DIMITRIOS C.

FERRARO, ANTONIO

BRAULIO GARCIA CAMARA

VERGAZ BENITO, RICARDO

BECCHERELLI , ROMEO

JOSE MANUEL SANCHEZ PENA