Shaping photoluminescence spectra with magnetoelectric resonances in all-dielectric nanoparticles

We measure the near-infrared photoluminescence spectra of colloidal quantum dots coupled to the localized electric and magnetic resonances of subwavelength silicon nanodisks. The spectral position of the resonances with respect to each other is controlled via the nanodisk geometry. We observe a strong influence of the nanodisk resonance positions on the quantum dot photoluminescence spectra. For separate resonances, the spectral density observed in transmittance measurements correlates with the spectral range covered by a broad emission spectrum. For the case of spectral overlap of the electric and magnetic dipolar resonances we enter a new regime for coupling, where the characteristic transparency effect evident in the transmittance spectra is accompanied by a pronounced single emission maximum. Our experimental observations are in good qualitative agreement with numerical calculations.The authors acknowledge support from the Australian Research Council through Centre of Excellence, Discovery Project, and DECRA Fellowship grants

Tailoring directional scattering through magnetic and electric resonances in subwavelength silicon nanodisks

Interference of optically induced electric and magnetic modes in high-index all-dielectric nanoparticles offers unique opportunities for tailoring directional scattering and engineering the flow of light. In this article we demonstrate theoretically and

Merging magnetic and electric resonances for all-dielectric nanoantenna arrays

We spectrally overlap the magnetic and electric resonances in all-dielectric silicon nanodisk arrays by tuning the disk aspect ratio. This offers new opportunities for functional metasurfaces and conceptually new all-dielectric unidirectional nanoantenna

Shaping emission spectra of quantum dots by all-dielectric metasurfaces

Silicon nanodisks support both electric and magnetic resonances, which can be tuned independently via their geometry. We utilize these engineered resonances and demonstrate dielectric metasurfaces for efficient shaping of the emission spectra of quantum dots

Shaping Photoluminescence Spectra with Magnetoelectric Resonances in All-Dielectric Nanoparticles

We measure the near-infrared photoluminescence spectra of colloidal quantum dots coupled to the localized electric and magnetic resonances of subwavelength silicon nanodisks. The spectral position of the resonances with respect to each other is controlled via the nanodisk geometry. We observe a strong influence of the nanodisk resonance positions on the quantum dot photoluminescence spectra. For separate resonances, the spectral density observed in transmittance measurements correlates with the spectral range covered by a broad emission spectrum. For the case of spectral overlap of the electric and magnetic dipolar resonances we enter a new regime for coupling, where the characteristic transparency effect evident in the transmittance spectra is accompanied by a pronounced single emission maximum. Our experimental observations are in good qualitative agreement with numerical calculations