Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 32: Quantum dots and wires: Optical properties II
HL 32.4: Vortrag
Mittwoch, 14. März 2018, 15:45–16:00, A 151
Dynamical Tuning of Nanowire Laser Spectra [1] — •Maximilian Zapf1, Robert Röder1, Karl Winkler2, Lisa Kaden1, Johannes Greil2, Marcel Wille3, Marius Grundmann3, Rüdiger Schmidt-Grund3, Alois Lugstein2, and Carsten Ronning1 — 1Institute for Solid State Physics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena — 2Institute of Solid State Electronics, TU Wien, Floragasse 7, A-1040 Vienna, Austria — 3Felix Bloch Institute for Solid State Physics, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany
The availability of coherent light sources on the nanoscale has recently brought up visionary concepts of integrated photonic circuits, nanospectroscopy, and nanosensing. These concepts will tremendously benefit from a dynamically tunable laser spectrum. Semiconductor nanowires (NWs) can provide both continuous wave laser emission and ultrafast modulation capabilities but individual NW laser devices currently suffer from fixed emission spectra determined by the material band gap. Therefore, we demonstrate an individual nanowire laser based device, which can be gradually tuned by reversible length changes of the nanowire such that uniaxial tensile stress is applied to the respective semiconductor gain material. By straining the device, the spontaneous excitonic emission of the nanowire shifts to lower energies caused by the bandgap reduction of the semiconductor. Moreover, the optical gain spectrum of the nanolaser can be precisely strain-tuned in the high excitation regime. [1] Zapf et al. Nano Lett., 17, 6637 (2017)