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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/24409
Title: Carrier dynamics in a tunneling injection quantum dot semiconductor optical amplifier
Authors: Khanonkin I.
Eisenstein G.
Lorke M.
Michael S.
Jahnke F.
Mishra, Akhilesh Kumar
Reithmaier J.P.
Published in: Physical Review B
Abstract: The process of tunneling injection is known to improve the dynamical characteristics of quantum well and quantum dot lasers; in the latter, it also improves the temperature performance. The advantage of the tunneling injection process stems from the fact that it avoids hot carrier injection, which is a key performance-limiting factor in all semiconductor lasers. The tunneling injection process is not fully understood microscopically and therefore it is difficult to optimize those laser structures. We present here a numerical study of the broadband carrier dynamics in a tunneling injection quantum dot gain medium in the form of an optical amplifier operating at 1.55μm. Charge carrier tunneling occurs in a hybrid state that joins the quantum dot first excited state and the confined quantum well-injection well states. The hybrid state, which is placed energetically roughly one longitudinal optic phonon above the ground state and has a spectral extent of about 5meV, dominates the carrier injection to the ground state. We calculate the dynamical response of the inversion across the entire gain spectrum following a short pulse perturbation at various wavelengths and for two bias currents. At a high bias of 200mA, the entire spectrum exhibits gain; at 30mA, the system exhibits a mixed gain-absorption spectrum. The carrier dynamics in the injection well is calculated simultaneously. We discuss the role of the pulse excitation wavelengths relative to the gain spectrum peak and demonstrate that the injection well responds to all perturbation wavelengths, even those which are far from the region where the tunneling injection process dominates. © 2018 American Physical Society.
Citation: Physical Review B, 98(12)
URI: https://doi.org/10.1103/PhysRevB.98.125307
http://repository.iitr.ac.in/handle/123456789/24409
Issue Date: 2018
Publisher: American Physical Society
ISSN: 24699950
Author Scopus IDs: 57193757612
7005889949
10639307400
15056394800
7006449125
15124163500
7004689148
Author Affiliations: Khanonkin, I., Andrew and Erna Viterbi Department of Electrical Engineering, Technion, Haifa, 32000, Israel
Eisenstein, G., Andrew and Erna Viterbi Department of Electrical Engineering, Technion, Haifa, 32000, Israel
Lorke, M., Institute for Theoretical Physics, University of Bremen, Bremen, 28334, Germany
Michael, S., Institute for Theoretical Physics, University of Bremen, Bremen, 28334, Germany
Jahnke, F., Institute for Theoretical Physics, University of Bremen, Bremen, 28334, Germany
Mishra, A.K., School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
Reithmaier, J.P., Institute of Nanostructure Technologies and Analytics, Technische Physik, CINSaT, University of Kassel, Kassel, 34132, Germany
Funding Details: This work is partially supported by the Israel Science Foundation, Grant No. 1504/16. M.L., S.M., and F.J. acknowledge funding from the DFG and a grant for CPU time from the HLRN (Hannover/Berlin). California Department of Fish and Game, DFG; Central Policy Unit, CPU; Deutsche Forschungsgemeinschaft, DFG; Israel Science Foundation, ISF: 1504/16
Appears in Collections:Journal Publications [PH]

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