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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/132433

Probing the Spontaneous Emission Dynamics in Si-Nanocrystals-Based Microdisk Resonators

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As a possible cavity quantum electrodynamical system, unlike III-V quantum dots, Si-NCs are not considered ideal emitters for emission rate enhancement observations (Purcell effect). Here, we report on direct measurements of spontaneous emission rate enhancement of Si-NCs embedded in a whispering-gallery mode resonator at room temperature. Using time-resolved microphotoluminescence experiments, we demonstrate important lifetime reductions ( ∼ 70 % ) for Si-NCs coupled to cavity modes with respect to uncoupled ones. Comparing experiments with the theoretical Purcell enhancement in a bad emitter regime, we estimate effective linewidths of ∼ 10     meV through which Si-NC emitters are coupled to cavity photons. Finally, our study provides an alternative method for the estimation of subnatural linewidths of quantum dots at room temperature.

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PITANTI, Alessandro, GHULINYAN, M., NAVARRO URRIOS, Daniel, PUCKER, G., PAVESI, Lorenzo. Probing the Spontaneous Emission Dynamics in Si-Nanocrystals-Based Microdisk Resonators. _Physical Review Letters_. 2010. Vol. 104, núm. 10, pàgs. 103901. [consulta: 25 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/132433]

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