Extraordinary Fluorescence Enhancement in Metal-Dielectric Core-Shell Nanoparticles

We show that in metal-dielectric core-shell nanoparticles, unusually thick dielectric coatings can produce extreme fluorescence enhancement with an enhancement factor (F) over bar greater than or similar to 3000 for emitters located on the surface or in the interior of the shell of Au@dielectric spherical particles under realistic conditions, even for the emitters with 100% intrinsic quantum yield. Thick dielectric coatings facilitate high-quality transverse electric (TE) multipole (l = 7) resonances which are shown as the major cause for the reported extraordinary values of (F) over bar.

Automated summary

Thick dielectric coatings in metal-dielectric core-shell nanoparticles can lead to extreme fluorescence enhancement due to high-quality transverse electric multipole resonances.