S. Hein
University of Würzburg
17 Papers
136 Citations
S. Hein is an academic researcher from University of Würzburg. The author has contributed to research in topics: Photoluminescence & Quantum dot laser. The author has an hindex of 9, co-authored 17 publications.
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Papers
Experimental evidence on quantum well–quantum dash energy transfer in tunnel injection structures for 1.55μm emission
G. Sęk,P. Poloczek,P. Podemski,Robert Kudrawiec,Jan Misiewicz,Andre Somers,S. Hein,Sven Höfling,A. Forchel +8 more
TL;DR: In this article, the authors investigated the energy transfer in InP-based tunnel injection structures, consisting of InAs∕InAlGaAs quantum dashes (QDashes) and an InGaAs∆InAlgaAs quantum well (QW), designed for 1.55μm emission at room temperature.
32
Columnar quantum dashes for an active region in polarization independent semiconductor optical amplifiers at 1.55μm
P. Podemski,G. Sęk,Krzysztof Ryczko,Jan Misiewicz,S. Hein,Sven Höfling,A. Forchel,Gilles Patriarche +7 more
TL;DR: In this paper, the optical properties of columnar quantum dashes are investigated by photoreflectance and photoluminescence and analyzed by comparison with effective mass calculations.
24
Height-driven linear polarization of the surface emission from quantum dashes
Anna Musiał,P. Podemski,Grzegorz Sęk,Piotr Kaczmarkiewicz,J. Andrzejewski,Paweł Machnikowski,Jan Misiewicz,S. Hein,Andre Somers,Sven Höfling,Johann Peter Reithmaier,Alfred Forchel +11 more
TL;DR: In this paper, the influence of the nanostructure height on the polarization of the surface emission was systematically investigated for In(Ga)As/InP quantum dashes, and strongly linearly polarized surface emission (up to 90%) was demonstrated for columnar quantum Dashes by combining the in-plane elongation with a significantly increased height.
22
The impact of p-doping on the static and dynamic properties of 1.5 μm quantum dash lasers on InP
TL;DR: In this article, the authors investigated the impact of p-type modulation doping on QDash lasers on (100) InP and found that the differential gain was increased more than 50% for doping concentrations of 50 acceptors per QDash for constant cavity length lasers.
19
Orientation dependent emission properties of columnar quantum dash laser structures
S. Hein,P. Podemski,G. Sęk,Jan Misiewicz,P Ridha,Andrea Fiore,Gilles Patriarche,Sven Höfling,Alfred Forchel +8 more
TL;DR: In this paper, columnar quantum dash (CQDash) structures on (100) InP have been realized by gas source molecular beam epitaxy for stacking numbers of up to 24.