Magnetic dipole emission in profile-modulated metal-dielectric-metal structure*

Plasmonic and cavity modes in metal-dielectric-metal structures can provide strong control on electric and magnetic emission of the emitters placed inside the structures.  Modulation of the profile allows one to excite plasmons with direct illumination. The excitation of surface plasmons, including gap plasmons was predicted with COMSOL simulations in dependence on the thickness of intermediate layer.  A clear conformity between experimental observations and theoretical predictions was observed. In our experiment, we study the electric and magnetic dipole emission from Eu3+ ions in the profile modulated three-layer Ag-Emitter layer-Ag structures.