Polarisation Dynamics of Quantum Dot VCSELs: Proposal to support Visiting Researcher Dr. D. Alexandropoulos

Lead Research Organisation: University of Essex
Department Name: Computer Sci and Electronic Engineering


In recent years polarisation dynamics in vertical cavity surface-emitting lasers (VCSELs) has been the subject of considerable research effort. A wide range of phenomena including polarisation switching, bistability, limit cycles and chaos has been studied theoretically and experimentally in VCSELs subject to orthogonal optical injection. The active regions of these VCSELs have consisted of bulk or quantum well (QW) material. At the same time, there have been significant advances in the technology of quantum dot (QD) VCSELs, whose key advantages include an excitonic gain mechanism, suppressed carrier diffusion and low degradation rate. Recent research has concentrated on development of QD gain media to give ultrahigh modal gain and enhanced modulation response. Novel VCSEL cavity designs have also been developed to suppress parasitic modes which can cause gain depletion and self-pulsation. However, there are as yet very few reports of polarisation-dependent effects for these QD VCSELs. The theoretical study of polarised optical injection in QD VCSELs that is proposed here represents an entirely new research direction of fundamental importance that is certain to further enhance the UK's optoelectronics research profile.


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Adams M (2012) Analysis of Quantum-Dot Spin-VCSELs in IEEE Photonics Journal

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Alexandropoulos D (2012) Instabilities in quantum-dot spin-VCSELs. in Optics letters

Description We developed the first rigorous extension of the spin flip model (SFM) equations to analyse quantum dot (QD) spin-VCSELs. Hence we made the first predictions of instabilities in QD spin-VCSELs.
Exploitation Route The background work which was done under this project fed into pump-priming work with the Sheffield EPSRC III-V Centre that resulted in a QD semiconductor disk laser operating at 1300 nm. This was further developed under EP/M024237/1 to make the first QD vertical external cavity surface-emitting laser. This has subsequently led to a new collaboration with University of Bristol within the EPSRC project SPINSPACE (EP/M024237/1).
Sectors Digital/Communication/Information Technologies (including Software)

URL http://privatewww.essex.ac.uk/~adamm/index.html