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Electronics 2016, 5(4), 83; doi:10.3390/electronics5040083

Stability Analysis of Quantum-Dot Spin-VCSELs

1
School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK
2
Department of Materials Science, University of Patras, Patras 26504, Greece
3
Department of Mathematical Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK
*
Author to whom correspondence should be addressed.
Academic Editors: Matteo Cantoni, Riccardo Bertacco and Christian Rinaldi
Received: 20 October 2016 / Revised: 15 November 2016 / Accepted: 18 November 2016 / Published: 23 November 2016
(This article belongs to the Special Issue Spin Optoelectronics)
View Full-Text   |   Download PDF [1143 KB, uploaded 23 November 2016]   |  

Abstract

Spin-polarized vertical-cavity surface-emitting lasers (spin-VCSELs) and vertical external-cavity surface-emitting lasers (spin-VECSELs) are of interest since their output polarization can be manipulated by spin-selective pumping, either optical or electrical. These devices, using quantum dot (QD) material for the active region, have shown instability (periodic oscillations) and polarization switching in previous theoretical simulations based on a rate equation model. It has been recognized that the polarization switching occurs between two possible sets of solutions, termed here in-phase and out-of-phase. The present contribution seeks to give enhanced understanding of these behaviors by applying a stability analysis to the system of equations used for such simulations. The results indicate that the choice of in-phase and out-of-phase solutions that appear in a time-dependent simulation is determined by the condition that the corresponding steady-state solutions are stable against small perturbations. The stability analysis is shown to be a valuable theoretical tool for future study of spin-V(E)SELs in the context of understanding and guiding future experimental research. View Full-Text
Keywords: laser; vertical cavity; polarization; spin; quantum dot; stability; instability; periodicity laser; vertical cavity; polarization; spin; quantum dot; stability; instability; periodicity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, N.; Alexandropoulos, D.; Susanto, H.; Henning, I.; Adams, M. Stability Analysis of Quantum-Dot Spin-VCSELs. Electronics 2016, 5, 83.

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