Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 58: Photonic Crystals: Experiment

HL 58.2: Talk

Thursday, March 25, 2010, 16:15–16:30, H13

Photonic crystal resonators with electrical contacts — •Martin Kamp, Benedikt Frieß, Thomas Schlereth, Sven Höfling, and Lukas Worschech — Technische Physik, Am Hubland, 97074 Würzburg

Photonic crystal (PhC) resonators with embedded quantum dots have become an intensively studied solid state system for experiments on cavity quantum electrodynamics. Contacts that allow carrier injection/extraction or the possibility to apply an electric field to the quantum dots provide an additional degree of control over these structures.

We have investigated PhC resonators fabricated in GaAs membranes with embedded InGaAs quantum dots. The upper and lower half of the GaAs membrane were doped, thus forming a pn junction. After definition of the contact metallization to the front and back side of the sample, photonic cystal resonators based on three missing holes in a PhC lattice were fabricated. The structures were measured by low temperature photo- and electroluminescence. The latter was observed when operating the structures in forward bias. A reverse bias allowed to tune the emission wavelength of quantum dots in the cavity by the quantum confined Stark effect. In addition, photocurrent spectroscopy was performed by scanning a tunable laser over the resonance of the cavity and detecting the photocurrent. The resonance of the PhC cavity is clearly observed, with a quality factor comparable to that observed in the photoluminescence.