DE MARCO, Maria; JIANG, Taizhi; FANG, Jie; LACOMME, Sabrina; ZHENG, Yuebing; BARON, Alexandre; KORGEL, Brian; BAROIS, Philippe; DRISKO, Glenna; AYMONIER, Cyril

doi:10.1002/adfm.202100915

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DE MARCO, Maria
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

JIANG, Taizhi
McKetta Department of Chemical Engineering

FANG, Jie
Walker Department of Chemical Engineering

Langue

Article de revue

Ce document a été publié dans

Advanced Functional Materials. 2021-02-19, vol. 31, n° 26, p. 2100915 (11 p.)

Wiley

Résumé en anglais

A goal in the field of nanoscale optics is the fabrication of nanostructures with strong directional light scattering at visible frequencies. Here, we demonstrate the synthesis of Mie-resonant coreshell particles with overlapping electric and magnetic dipole resonances in the visible spectrum. The core consists of silicon surrounded by a lower index silicon oxynitride (SiOxNy) shell with an adjustable thickness. Optical spectroscopies coupled to Mie theory calculations give the first experimental evidence that the relative position and intensity of the magnetic and electric dipole resonances are tuned by changing the core-shell architecture. Specifically, coating a high-index particle with a low-index shell coalesces the dipoles, while maintaining a high scattering efficiency, thus generating broadband forward scattering. This synthetic strategy opens a route towards metamaterial fabrication with unprecedented control over visible light manipulation.< Réduire

Mots clés en anglais

Visible light silicon resonators

core-shell

Huygens sources

directional light scattering

DOI

http://dx.doi.org/10.1002/adfm.202100915

Project ANR

Advanced Materials by Design - ANR-10-LABX-0042
Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
Développement d'une infrastructure française distribuée coordonnée - ANR-10-INBS-0004

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Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026