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O: Fachverband Oberflächenphysik

O 28: Plasmonics and Nanooptics IV: Light-Matter Interaction

O 28.1: Vortrag

Dienstag, 21. März 2017, 10:30–10:45, TRE Ma

Rolled-up active microtubes containing tuneable grating couplers for the excitation of surface plasmon polaritons — •Jan Siebels¹, Hoan Vu¹, Alf Mews¹, Stefan Mendach², and Tobias Kipp¹ — ¹Institut für Physikalische Chemie, Universität Hamburg — ²Institut für Angewandte Physik, Universität Hamburg

Grating structures can be utilized in order to overcome the momentum mismatch between an incident photon and a surface plasmon polaritons (SPPs) at a metal/dielectric interface. We implemented grating structures with gradually varying effective refractive indices into active microtubes containing GaAs quantum wells. The grating consists of triangularly shaped silver bars--varying the filling-factor in the direction perpendicular to the periodicity. This allows for a position-dependent coupling of the quantum well emission to the SPP. To characterize these systems we implemented a photoluminescence mapping technique by means of a streak camera which allows simultaneous recording of spectral distribution and related decay characteristics. The spatially resolved data reveals spectral shifts and changes of the decay lifetime that can be attributed to localized excitation of SPPs due to the embedded gratings. We gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG) via ME3600/1.