Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 49: Quantum Dots: Optical Properties III
HL 49.7: Vortrag
Mittwoch, 22. März 2017, 11:30–11:45, POT 151
Implementation of single quantum dots into photonic structures for enhanced light extraction efficiency — •Marc Sartison1, Simone Luca Portalupi1, Timo Gissibl2, Michael Jetter1, Harald Giessen2, and Peter Michler1 — 1IHFG, IQST Center and SCoPE, University of Stuttgart — 24th Physics Institute and Research Center SCoPE, University of Stuttgart
Semiconductor quantum dots (QDs) have demonstrated their strength in being ideal candidates for quantum information purposes. However, the amount of light extracted from the semiconductor matrix is severely limited by the refractive index contrast at the semiconductor-to-air interface. Several successful efforts were made to overcome this limitation by fabrication of light extraction enhancing structures, such as micro-pillars or micro-lenses. To enhance the fabrication yield of such devices, deterministic techniques of randomly grown Stranski-Krastanov QDs were established. We present a novel approach for the deterministic placement of single QDs into light extraction enhancing structures with a fabrication yield close to 100%. The QDs are spatially and spectrally pre-selected and characterized in micro-photoluminescence, followed by a low-temperature photolithography step to define precisely placed alignment markers which are then clearly visible under the optical microscope at room temperature and allow performing further fabrication steps. Based on these markers, a 3D direct laser writing machine is aligned and micrometric-sized broadband solid immersion lenses are printed to enhance the extraction efficiency.