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HL: Fachverband Halbleiterphysik
HL 93: Poster Session: Metal-Semiconductor Hybrid Systems, Plasmonic Systems / Photonic Crystals / Carbon: Diamond & CNT / Quantum Information Systems
HL 93.1: Poster
Donnerstag, 29. März 2012, 16:00–19:00, Poster D
Optical properties of hybrid semiconductor-metal structures — •L.E. Kreilkamp1, M. Pohl1, V.I. Belotelov2, A.K. Zvezdin2, G. Karczewski3, T. Wojtowicz3, A. Rudzinski4, M. Kahl4, I.A. Akimov1, D.R. Yakovlev1, and M. Bayer1 — 1Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany — 2A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, 119992 Moscow, Russia — 3Institute of Physics, Polish Academy of Sciences, 02668 Warsaw, Poland — 4Raith GmbH, Konrad-Adenauer-Allee 8, 44263 Dortmund, Germany
We study the optical properties of hybrid nanostructures comprising a semiconductor CdTe quantum well (QW) separated by a thin CdMgTe cap layer of 40 nm from a patterned gold film. The CdTe/CdMgTe QW structure with a well width of 10nm was grown by molecular beam epitaxy. The one-dimensional periodic gold films on top were made using e-beam lithography and lift-off process. The investigated structures can be considered as plasmonic crystals because the metal films attached to the semiconductor are patterned with a period in the range from 475 to 600 nm, which is comparable to the surface plasmon-polariton (SPP) wavelength. Angle dependent reflection spectra at room temperature clearly show plasmonic resonances. PL spectra taken at low temperatures of about 10 K under below- and above-barrier illumination show significant modifications compared to the unstructured QW sample. The number of emission lines and their position shift change depending on the excitation energy. The role of exciton-SPP coupling and Schottky barrier at the semiconductor-metal interface are discussed.