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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, et al. Probing the Spontaneous Emission Dynamics in Si-Nanocrystals-Based Microdisk Resonators. Physical Review Letters. 2010. Vol. 104, num. 10, pags. 103901. ISSN 0031-9007. [consulted: 19 of August of 2026]. Available at: https://hdl.handle.net/2445/132433