Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 18: Plasmons, plasmonic laser, and spaser
HL 18.3: Talk
Monday, March 16, 2015, 16:15–16:30, EW 203
Photonic and plasmonic coupled CdS nanowire lasing — •Lukas Trefflich1, Robert Röder1, Themistoklis Sidiropoulos2, Rupert F. Oulton2, and Carsten Ronning1 — 1Institut für Festkörperphysik, Friedrich- Schiller- Universität Jena, Max- Wien- Platz 1, 07743 Jena — 2Imperial College London, Prince Consort Road, UK-SW7 2BZ London, UK
Conventional electronic circuitry has driven the technological progress for decades by progressive miniaturization of the structure. However, facing its limits concerning the minimal size of the structures an alternative approach might be provided utilizing nanophotonic elements. The building of such devices for optical data processing urgently requires nanoscale light sources like nanolasers. Compound semiconductor nanowires made of zinc oxide (ZnO) or cadmium sulfide (CdS) are well known as coherent nano-lightsources. Especially, CdS nanowires emitting in the green spectral range show room temperature lasing as well as cw operation [Geburt et al, Nanotechnology 23, 365204 (2012), Röder et al, Nano Letters 13, 3602 (2013)]. However, these nanowire lasers are limited in size and maximal switching speed due to the diffraction limit and the relatively slow light-matter interactions. Confining the guided electric field by coupling it to surface plasmons accelerates the spontaneous and stimulated emission through the Purcell- effect, making ultrafast, sub- wavelength nanolasers possible. Therefore, the polarization properties as well as the temporal dynamics of cadmium sulfide nanowires on photonic and plasmonic surfaces are investigated.