Effect of Dielectric Medium Anisotropy on the Polarization Degree of Emission from a Single Quantum Dash
Paweł Mrowiński, Karol Tarnowski, Jacek Olszewski, A. Somers, Martin Kamp, Sven Höfling, Johann Peter Reithmaier, Wacław Urbańczyk, J. Misiewicz, Paweł Machnikowski, Grzegorz Sek · Acta Physica Polonica A · 2016
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.