期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202100915
关键词
core– shell particles; directional light scattering; Huygens sources; visible light silicon resonators
类别
资金
- LabEx AMADEus, the Investissements d'Avenir program of the French government [ANR-10-LABX-42, ANR-10-IDEX-03-02]
- Robert A. Welch Foundation [F-1464]
- National Science Foundation through the Center for Dynamics and Control of Materials, an NSF MRSEC [DMR-1720595]
- National Science Foundation [NSF-ECCS-2001650]
- National Institute of General Medical Sciences of the National Institutes of Health [DP2GM128446]
- Bordeaux Imaging Center [ANR-10-INBS-04]
This study demonstrates the synthesis of Mie-resonant core-shell particles with overlapping electric and magnetic dipole resonances in the visible spectrum, allowing for tuning of the relative position and intensity of these resonances. Coating high-index particles with low-index shells coalesces the dipoles while maintaining high scattering efficiency, leading to broadband forward scattering. This synthetic strategy opens up new possibilities for metamaterial fabrication with unprecedented control over visible light manipulation.
A goal in the field of nanoscale optics is the fabrication of nanostructures with strong directional light scattering at visible frequencies. Here, the synthesis of Mie-resonant core-shell particles with overlapping electric and magnetic dipole resonances in the visible spectrum is demonstrated. The core consists of silicon surrounded by a lower index silicon oxynitride (SiOxNy) shell of 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 toward metamaterial fabrication with unprecedented control over visible light manipulation.
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