期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201801958
关键词
aerosol sprays; dielectric Mie resonators; Titania spheres
类别
资金
- European Union [654148]
- COST action [MP1403]
- French ANR agency [ANR-15-CE24-0027-01]
- A*MIDEX [ANR- 11-IDEX-0001-02]
In the framework of photonics with all-dielectric nanoantennas, sub-micrometric spheres can be exploited for a plethora of applications including vanishing back-scattering, enhanced directivity of a light emitter, beam steering, and large Purcell factors. Here, the potential of a high-throughput fabrication method based on aerosol-spray is shown to form quasi-perfect sub-micrometric spheres of polycrystalline TiO2. Spectroscopic investigation of light scattering from individual particles reveals sharp resonances in agreement with Mie theory, neat structural colors, and a high directivity. Owing to the high permittivity and lossless material in use, this method opens the way toward the implementation of isotropic meta-materials and forward-directional sources with magnetic responses at visible and near-UV frequencies, not accessible with conventional Si- and Ge-based Mie resonators.
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