Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 35: Optical Properties II
HL 35.4: Talk
Wednesday, March 11, 2026, 17:15–17:30, POT/0251
Directional lasing and optical coupling in indium phosphide nanowires — •Lukas Raam Jäger1, Wei Wen Wong2, Hark Hoe Tan2, and Carsten Ronning1 — 1Friedrich-Schiller-Universität Jena, Fürstengraben 1, 07743 Jena, Germany — 2The Australian National University, Canberra ACT 2600, Australia
Indium phosphide (InP) nanowires (NWs) are promising nanoscale light sources due to their strong optical confinement and compatibility with selective-area epitaxy. We investigate optical coupling in vertically standing lasing InP NWs using finite-difference time-domain simulations and angle-resolved photoluminescence. Single NWs lase in the TE01 mode for diameters above about 250 nm and exhibit far-field patterns shaped by interference of emission from the top and bottom facets. Coupled NW structures enable controlled emission engineering. In NW pairs, coupling splits the TE01 mode into two hybrid modes with orthogonal directional lobes, in good agreement with experiment. Mode selection is highly sensitive to subtle geometric differences, while asymmetric pumping has negligible effect. Extending this concept to arrays of NW pairs shows that array-level interference can further narrow the emission lobes. Triplet NW structures exhibit three distinct hybrid modes with characteristic far-field patterns. These results demonstrate designable directional nanoscale emitters based on coupled NW lasers.
Keywords: indium phosphide nanowires; nanowire lasers; optical coupling; directional emission; FDTD simulations