Optical nanostructures for boosting fluorescence from magnetic dipolar transitions

Abstract

Trivalent lanthanides naturally offer strong magnetic dipole (MD) transition due to the selection rule forbidden electric dipole (ED) transition. This inspires the investigation of different nanophotonic platforms for efficiently modifying the magnetic nature of light. Here, we introduce high-index all-dielectric nanostructures including Mie-resonant silicon (Si) nanocylinder metasurfaces, broken symmetry titanium dioxide ( TiO2 ) metasurfaces supporting high Q-factor resonances, and an efficient fabrication process for deterministic coupling of the fluorophores to the hotspot of the Si dimers.