Manipulation of the Spontaneous Emission Dynamics of Quantum Dots in 2D Photonic Crystals

Abstract

We demonstrate the ability to control the spontaneous emission dynamics of self-assembled quantum dots via the local density of optical modes in 2D-photonic crystals. We show that an incomplete 2D photonic bandgap is sufficient to significantly lengthen the spontaneous emission lifetime ($>2\times$) over a wide bandwidth ($\Delta \lambda \ge 40$ nm). For dots that are both \textit{spectrally} and \textit{spatially} coupled to strongly localized ($V_{mode}\sim 1.5(\lambda /n{)}^3$), high $Q\sim 2700$ optical modes, we have directly measured a strong Purcell enhanced shortening of the emission lifetime $\ge 5.6\times$, limited only by our temporal resolution. Analysis of the spectral dependence of the recombination dynamics shows a maximum lifetime shortening of $19\pm 4$. From the directly measured enhancement and suppression we show that the single mode coupling efficiency for quantum dots in such structures is at least $\beta =92$ and is estimated to be as large as $\sim 97$.

11 pages, 3 figures

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