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 nanbdisk 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 effect evident in the transmittance spectra is accompanied by observations are in good-qualitative agreement with numerical a new regime for coupling, where the characteristic transparency by a pronounced single emission maximum. Our experimental observations are in good-qualitative agreement with numerical calculations.