Effect of Dielectric Medium Anisotropy on the Polarization Degree of Emission from a Single Quantum Dash

P. Mrowiński a, K. Tarnowski b, J. Olszewski b, A. Somers c, M. Kamp c, S. Höflingc,d, J.P. Reithmaier e, W. Urbańczyk b, J. Misiewicz a, P. Machnikowski f and G. Sęk a aLaboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland bDepartment of Optics and Photonics, Wrocław University of Technology, Wrocław, Poland cTechnische Physik, W.C. Röntgen-Center for Complex Material Systems, Universität Würzburg, Germany dSUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, KY16 9SS St. Andrews, United Kingdom eInstitute of Nanostructure Technologies and Analytics (INA), CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany fDepartment of Theoretical Physics, Wrocław University of Technology, Wrocław, Poland

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Excitonic emission from single InAs/InGaAlAs/InP quantum dashes has been investigated in the context of degree of linear polarization by post-growth modification of its surrounding dielectric medium. We present optical spectroscopy measurements on a symmetric squared pedestal structures (mesas), and asymmetric rectangular ones oriented parallel or perpendicular to the main in-plane axis of the dashes [1-10]. Polarization resolved microphotoluminescence shows a significant quantitative modification of the degree of linear polarization value from -20% up to 70%. These results have been confronted with calculations of the coupling between the exciton transition dipole moment and electromagnetic field distributed in the vicinity of a quantum dash inside a processed mesa.

DOI: 10.12693/APhysPolA.129.A-48 PACS numbers: 78.67.Hc, 71.35.-y, 78.55.-m