Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Poster III

HL 39.20: Poster

Wednesday, March 19, 2025, 15:00–18:00, P3

Investigation of the optical coupling of lasing ZnO nanowires — •Ann-Kathrin Kollak, Lukas Raam Jäger, Francesco Vitale, and Carsten Ronning — Institute of Solid State Physics, Friedrich Schiller University Jena, Germany

Semiconductor nanowires offer potential for miniaturizing optical circuits. Good candidates for this application are ZnO nanowires, because their bottom-up growth via the Vapor-Liquid-Solid (VLS) mechanism allows for high quality crystal structures. When optically pumped, ZnO nanowires simultaneously act as an active medium and a laser cavity, emitting UV light mainly waveguided to their end facets. To study the interaction of these nanometer-scale lasers via evanescent field coupling, two nanowires were positioned in contact next to each other on a SiO₂ substrate using a nanomanipulator. In a micro-PL (photoluminescence) setup, the nanowire pair was optically excited using the third harmonic of an Nd:YAG laser (355 nm). The pair’s emission was collected with the same setup, allowing the investigation of the spatially resolved PL and lasing spectra, as well as their linear polarization parallel to the substrate. The data obtained indicate that ZnO nanowire cavities can couple with one another. Depending on the geometry of the nanowire pair and the pumping conditions, optical modes that extend into both cavities can appear in addition to modes confined to only one nanowire. In other cases, the coupled modes dominate the lasing behavior.

Keywords: ZnO; coupling; lasing; nanowires; waveguide