Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 38: Zinc Oxide
HL 38.6: Vortrag
Dienstag, 21. März 2017, 11:00–11:15, POT 06
Microdisks coupled with Waveguides of II/VI quantum well heterostructures — •Gesa Schmidt, Torsten Rieger, Detlev Grützmacher, and Alexander Pawlis — PGI-9 and JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
Waveguides and microdisks were fabricated from II/VI quantum wells (QWs) grown by molecular beam epitaxy on GaAs substrates. They provide suitable components for integrated-optical devices in the blue/green spectrum. Additionally, doping of the QWs with fluorine allows modern devices such as low-threshold lasers and single photon sources and their integration. To this end, the introduction of an Al2O3 interlayer, fabricated by selective post-growth oxidation of an AlAs buffer between the GaAs and the II/VI heterostructure, provides improved waveguiding and reduced photon leakage. Al2O3 is optically transparent for the emission from the QWs and has considerably smaller refractive index compared to the II/VI material.
We present optical properties and photon-guiding characteristics of microdisk cavities with adjacent waveguide membranes. The analysis of spatial-resolved µ-photoluminescence measurements along the waveguide demonstrates the photon transfer between microdisk and waveguide. Moreover, we observed lasing at specific whispering gallery modes of our microdisks, which denote efficient photon guiding along the waveguide. Our findings demonstrate functional operation of microdisk-waveguide couplers based on ZnSe/(Zn,Mg)Se QW structures and their potential for larger scale integrated-optical systems in the blue/green spectral range.