Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 47: Quantum dots and wires: Optical properties II
HL 47.7: Vortrag
Freitag, 5. April 2019, 11:15–11:30, H34
Distributed Bragg Reflectors in Nanowires towards Impurity Nanolasers — •Maximilian Zapf1, Oscar Kennedy2, Robert Röder1, Robert Buschlinger3, Ulf Peschel3, Paul Warburton2, and Carsten Ronning2 — 1Institute of Solid State Physics, Friedrich Schiller Universität Jena — 2London Centre for Nanotechnology, University College London — 3Institute for Solid State Theory and -Optics, Friedrich-Schiller-Universität Jena
Nanoscale coherent light sources are key components in novel photonic concepts for integrated photonic circuits and lab-on-a-chip devices. Optically one-dimensional nanolasers are currently realized using semiconductor nanowires (NWs) under intense optical excitation. Distributed Bragg reflectors (DBRs), where the nanowire is periodically cut, have higher reflectivity than a single end facet at wavelengths pre-determined by the spacing of cuts. These wavelength-selective mirrors can be combined with gain from the semiconductor material or from dopants ion implanted into the NW to shift laser emission within a broad spectral range. Finite-difference time-domain calculations were performed to simulate the wavelength-dependent reflections occurring at an air - ZnO DBR structure. Such DBR structures were milled into ZnO nanowires using inert-gas focused ion beam providing the high refractive index contrast between the ZnO material and air. Subsequently, reflection and transmission properties of the DBR structures have been studied. Enhanced wavelength-dependent end facet reflections allow reducing laser thresholds in nanowire lasers as well as tailorable nanoscale wavelength filtering, and spectral emission tuning.