Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.61: Poster
Wednesday, March 22, 2017, 15:00–19:00, P1A
Spectral tuning of GaAs-based photonic crystal cavities for the deterministic coupling of individual quantum dots — •Stephanie Bauer, Stefan Hepp, Simone L. Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology IQST and Research Center SCoPE, University of Stuttgart
Quantum dots (QDs) have been proven to be ideal candidates as single-photon sources especially when they are placed inside a cavity to benefit from cavity quantum electrodynamic effects. For sufficient enhancement it is important to spatially position the QD inside the field maximum of the cavity mode and to reduce the spectral mismatch between the cavity and the emitter. Recently, a lot of efforts have been made in terms of quality factor optimization and the deterministic positioning of individual QDs in nanostructures. However, the high Q-factor results in narrow cavity linewidth and the sensitivity of the spectral position due to unavoidable fabrication imperfections makes the deterministic coupling to preselected QDs complicated. Therefore, a postprocessing tuning mechanism is required to reduce the spectral detuning between the cavity and the embedded emitter. Here we show that we can tune the resonant wavelength of L3-photonic crystal cavities via several digital etching steps independently from individual QD lines to the wavelength of interest. This process can be repeated several times whereby the typical tuning is in the range of 3 nm. Furthermore, an improvement of the Q-factor could be observed for a large number of cavities depending on the initial design parameters of the cavity.