Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 43: Photonic crystals I
HL 43.2: Vortrag
Donnerstag, 26. März 2009, 09:45–10:00, POT 151
Room Temperature Tuning of Photonic Crystal Cavities — •Karoline A. Piegdon1,2, Heiner Matthias3, Heinrich-S. Kitzerow3, Dirk Reuter4, and Cedrik Meier2 — 1University of Duisburg-Essen, Physics Department — 2University of Paderborn, Nanophotonics and Nanomaterials — 3University of Paderborn, Physical Chemistry — 4Ruhr University of Bochum
Photonic crystal (PC) cavities are in the focus of interest due to the strong light-matter interaction, that makes them suitable for quantum electrodynamics in cavities containing semiconductor quantum dots (QDs). Recent experiments with single QDs coupled to a high quality factor cavity mode got most attention, since they show strong cavity-QED effects. However, the inability to fabricate cavities with a designated resonant wavelength makes their tuning indispensable.
In our room temperature photonic crystal cavities we implemented different techniques for reversible or permanent tuning of the resonant mode. We fabricated photonic crystal membranes from a (Al,Ga)As heterostructure; the membrane slab contains self-assembled InAs QDs exhibiting luminescence at 300K between 1000nm and 1300nm. In all experiments we employed control of the refractive index of the surrounding of the photonic crystals in order to gain control over the resonant mode wavelength. Depending on the application, reversible or irreversibel tuning is desired. This is achieved by deposition of thin layers of material on the PC or by using the tunability of liquid crystals.