All-Dielectric Silicon Nanoslots for Er3+ Photoluminescence Enhancement

Boris Kalinic, Tiziana Cesca, Sandro Mignuzzi, Andrea Jacassi, Ionut Gabriel Balasa, Stefan A. Maier, Riccardo Sapienza, Giovanni Mattei

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We study, both experimentally and theoretically, the modification of Er3+ photoluminescence properties in Si dielectric nanoslots. The ultrathin nanoslot (down to 5-nm thickness), filled with Er in SiO2, boosts the electric and magnetic local density of states via coherent near-field interaction. We report an experimental 20-fold enhancement of the radiative decay rate with negligible losses. Moreover, via modifying the geometry of the all-dielectric nanoslot, the outcoupling of the emitted radiation to the far field can be strongly improved, without affecting the strong decay-rate enhancement given by the nanoslot structure. Indeed, for a periodic square array of slotted nanopillars an almost one-order-of-magnitude-higher Er3+ PL intensity is measured with respect to the unpatterned structures. This has a direct impact on the design of more efficient CMOS-compatible light sources operating at telecom wavelengths.

Original languageEnglish
Article number014086
Number of pages11
JournalPhysical Review Applied
Issue number1
Publication statusPublished - Jul 2020
Externally publishedYes

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