Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 24: Poster Session II
HL 24.31: Poster
Tuesday, March 13, 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.