Physics – Quantum Physics
Scientific paper
2005-01-04
Phys. Rev. B 71, 241304(R) (2005)
Physics
Quantum Physics
11 pages, 3 figures
Scientific paper
10.1103/PhysRevB.71.241304
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 ($\Delta\lambda\geq40$ nm). For dots that are both \textit{spectrally} and \textit{spatially} coupled to strongly localized ($V_{mode}\sim1.5(\lambda/n)^{3}$), high $Q\sim2700$ optical modes, we have directly measured a strong Purcell enhanced shortening of the emission lifetime $\geq5.6\times$, limited only by our temporal resolution. Analysis of the spectral dependence of the recombination dynamics shows a maximum lifetime shortening of $19\pm4$. 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 $\sim97%$.
Boehm G.
Finley Jonathan J.
Hofbauer F.
Krenner Hubert. J.
Kress Achim
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