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HL: Fachverband Halbleiterphysik

HL 24: Poster Session II

HL 24.31: Poster

Dienstag, 13. März 2018, 18:30–20:30, Poster F

Steady state optical spectroscopy and time- and spatially-resolved pump-probe measurements on a plasmonic CdZnTe/CdMgTe waveguiding structure — •Alexander Trautmann¹, Jonas Vondran², Felix Spitzer², Ilya Akimov², Manfred Bayer², Nils Weber¹, Cedric Meier¹, Régis Andre³, Henri Mariette³, Matthias Reichelt¹, and Torsten Meier¹ — ¹Department of Physics and CeOPP, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany — ²Experimentelle Physik 2, TU Dortmund, Otto-Hahn-Str. 4, D-44221 Dortmund, Germany — ³CEA-CNRS Group Nanophysique et Semiconducteurs, Institut Néel, Université Grenoble-Alpes, 38042 Grenoble, France

A plasmonic gold grating on a CdZnTe/CdMgTe waveguide structure leads to different signatures in the reflectivity spectra for s- and p-polarized light. Experiments and simulations show a significant decrease of the reflectivity for p-polarization due to the excitation of surface plasmon polaritons. Furthermore, nonlinear optical pump-probe experiments with femtosecond laser pulses using spatially-localized excitation pulses are investigated. Both, the experiment and the simulations, using a model based on the Maxwell-Bloch equations, show several interesting effects in the differential reflectivity transients including contributions from the optical Stark effect. The obtained transients are discussed as function of the spatial separation and other relevant parameters.