Shaping Photoluminescence Spectra with Magnetoelectric Resonances in All-Dielectric Nanoparticles

Abstract

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.

Chemical Alkaline Etching of Silicon Mie Particles

“…Recently, silicon particles triggered a keen interest for their ability to feature electric and magnetic Mie resonances in the visible and near infrared spectral regions. [10][11][12][13][14][15][16][17][18][19] Different techniques have been developed to fabricate single or coupled Si-based Mie resonators. [6][7][8][9] The interplay between the electric and magnetic resonances provides to Mie resonators unique light scattering properties.…”

“…[6][7][8][9] The interplay between the electric and magnetic resonances provides to Mie resonators unique light scattering properties. [10][11][12][13][14][15][16][17][18][19] Different techniques have been developed to fabricate single or coupled Si-based Mie resonators. The laser lithography technique proved its ability to fabricate high-quality amorphous or crystalline silicon particles on transparent substrate.…”

“…[ 24 ] The nanoimprint is also a very interesting method for large scale nanostructures and it was applied as mask for reactive ion etching (RIE) to design antirefl ective coatings on silicon wafer. [ 10,11,16 ] These methods benefi ted from recent progress in plasmonics to design at a nanometer scale metallic nanostructures. [ 10,11,16 ] These methods benefi ted from recent progress in plasmonics to design at a nanometer scale metallic nanostructures.…”

“…[ 25 ] The electronic lithography with RIE is well adapted to fabricate monomers or oligomers of particles. [ 10,11,16 ] These methods benefi ted from recent progress in plasmonics to design at a nanometer scale metallic nanostructures. However, all these techniques include expensive machines as rapid thermal annealing ovens or RIE systems.Here we develop an alternative and cost effective method dedicated to semiconductor materials exclusively, and in particular to silicon.…”

Linear ultrafast dynamics of plasmon and magnetic resonances in nanoparticles

“…The peculiar properties of such magnetic resonances, achieved with non-magnetic, low-absorptive nanostructures, have been explored in a variety of fields: metamaterials [38][39][40] , metasurfaces 41 , nanoantennas 33,42,43 , Fano resonances 44,45 , and surfaceenhanced spectroscopies 46,47 . Moreover, it has been proven the possibility to selectively tune the magnetic and electric dipole resonances in Si nanoparticles by changing their shape and aspect ratio and to calculate the scattering efficiencies of arbitrary shaped nanoparticles in the discrete dipole approximation 48 .…”