Berlin 2008 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 22: Hybrid systems
HL 22.1: Talk
Tuesday, February 26, 2008, 09:30–09:45, EW 201
Coherent exciton - surface plasmon polariton interaction in hybrid metal semiconductor nanostructures — •Parinda Vasa1,2, Robert Pomraenke1, Stephan Schwieger2, Yuri Mazur3, Vasyl Kunets3, Erich Runge2, Gregory Salamo3, and Christoph Lienau1 — 1Insitut für Physik, Carl von Ossietzky Universität Oldenburg, 26129 Oldenburg, Germany — 2Technische Universität Ilmenau, Theoretische Physik I, Postfach 100565, 98684 Ilmenau, Germany — 3Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
We report the first measurement of a coherent coupling between Surface Plasmon Polaritons (SPPs) excited on a metal grating and excitons in a GaAs/AlGaAs Quantum Well (QW). The hybrid metal-semiconductor nanostructure is fabricated by molecular beam epitaxy followed by electron beam lithography. The structure is designed to maximize the radiative interaction between the two excitations which is probed by low-temperature, angle-resolved, far-field reflectivity measurements. As a result of the coupling, a significant shift of ∼7meV and an increase in broadening by ∼4meV of the QW exciton resonance are observed. The coupling strengths are calculated based on a phenomenological, coupled oscillator model and are found to be as large as 50meV. Such a strong interaction can significantly enhance the luminescence yield of a semiconductor.