The spontaneous emission rate of erbium ions is enhanced by coupling to localized plasmonic resonances in subwavelength annular apertures in a Au film. The Er3+ ions, embedded in SiO2, are selectively located inside the apertures. The annular apertures act as nanocavities, enhancing the local density of optical states at the Er emission wavelength of 1.54 μm when the cavities are tuned to that wavelength. We show that this leads to an eightfold increase of the photoluminescence intensity, in conjunction with a 2.4-fold enhancement of the spontaneous emission rate.

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Journal Appl. Phys. Lett.
Kroekenstoel, E.J.A, Verhagen, E, Walters, R.J, Kuipers, L, & Polman, A. (2009). Enhanced spontaneous emission rate in annular plasmonic nanocavities. Appl. Phys. Lett., 95(Article number: 263106), 1–3. doi:10.1063/1.3276566