Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 51: Photonic crystals II

HL 51.4: Talk

Friday, March 27, 2009, 11:00–11:15, BEY 154

Photonic crystal cavities with embedded site-controlled quantum dots — •Martin Kamp, Thomas Sünner, Benedikt Friess, Christian Schneider, Micha Strauß, Alexander Huggenberger, Daniel Wiener, Sven Höfling, and Alfred Forchel — Technisch Physik, Am Hubland, 97074 Würzburg

Photonic crystal (PhC) cavities with embedded quantum dots (QDs) have become an attractive model system for the study of cavity quantum electrodynamics (CQED). In order to maximize the coupling between the cavity and a quantum dot, the emission of the latter has to match the resonance wavelength of the cavity. Furthermore, the dot should be located at the maximum of the localized optical mode. We present a scalable method that allows the fabrication of site-controlled quantum dots embedded in photonic crystal cavities, thus addressing this issue of spatial alignment. First, a set of markers is defined on a GaAs sample, followed by patterning of an array of nano-holes which serve as nucleating centers for the growth of InGaAs QDs. After the epitaxy, membranes with PhC cavities are fabricated. The array of nano-holes and the cavities are both aligned to the markers, resulting in an overlay accuracy of better than 50 nm. Charaterization of the structures was performed by low temperature photoluminescence. The spectra show sharp emission lines, which can be attribued to individual quantum dots and the cavity. An enhancement of the spontaneous emission was observed when the dot was brought in resonance with the cavity by temperature tuning.