Abstract
AbstractWe report on an experimental study of the optical properties of a metal‐semiconductor hybrid structure consisting of a gold grating on a GaAs quantum well (QW). Our experiments reveal a coherent coupling between the surface plasmon polaritons (SPP) excited on a metal grating and the QW excitons. The hybrid structure is designed to optimize the radiative exciton‐SPP interaction which is probed by low‐temperature, angle‐resolved far‐field reflection spectroscopy. As a result of the coupling, a significant shift of ∼7 meV and an increase in broadening by ∼4 meV of the QW exciton resonance are observed. The results are explained with the help of a phenomenological two layered model, predicting coupling strengths as large as 30 meV. Such a strong interaction can, e.g. be used to enhance the luminescence yield of semiconductor quantum structures or to amplify SPP waves. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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