Tunable resonance in surface-plasmon-polariton enhanced spontaneous emission using a denser dielectric cladding

摘要

The authors propose an approach in tuning the resonance energy of spontaneous emission mediated by surface plasmon polariton, using a stratified structure of dielectric (D0)-metal (M) -dielectric (D1)-dielectric (D2). When the dielectric constants satisfy the condition of ε_(D1) > ε_(D0) > ε_(D2) or ε_(D1) < ε_(D0) < ε_(D2), the resonance can be tuned by changing the thickness of D1 layer. A configuration of GaN-Ag-Si-air is utilized to prove the feasibility of our approach, in which the silicon cladding is optically denser than GaN. This configuration is much simpler than those schemes proposed before and should be easily demonstrated by experiment.