Coupling of Er ions to surface plasmons on Ag

Kalkman, J.; Kuipers, L.; Polman, A.; Gersen, H.
January 2005
Applied Physics Letters;1/24/2005, Vol. 86 Issue 4, p041113
Academic Journal
Er3+ ions located 100 nm beneath the surface of silica glass show an enhanced photoluminescence decay rate when the glass is covered with Ag. Correcting for concentration quenching effects, the decay rate is enhanced by 70%, compared to the case without Ag. The data are in agreement with a model that takes into account variations in local density of states and excitation of surface plasmons and lossy surface waves, resulting in direct evidence for the efficient generation of surface plasmons by excited Er3+ ions. Using the model, optimum conditions for coupling to surface plasmons are derived, which can be used to enhance the emission rate and quantum efficiency of a wide range of Er-doped materials.


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