Enhanced Directional Fluorescence Spontaneous emission via Multipolar Interference in Metal-Dielectric Hybrid Nanoantenna

A novel type of metal-dielectric hybrid nanoantenna that leverages the advantages of high electric field enhancement from metal and low loss from dielectric, is proposed for fluorescence enhancement. Enhanced directional fluorescence radiation is achieved via coherent coupling between the metal plasmonic-resonance and dielectric magnetic dipole mode. The average enhancement factor of a randomly oriented fluorescence emitter cluster can reach ∼1500 and the maximum directivity enhancement can reach ∼3000.