Instabilities in Spin-Polarized Vertical-Cavity Surface-Emitting Lasers

Al-Seyab, R.; Alexandropoulos, Dimitris; Henning, I.D.; Adams, M.J.

doi:10.1109/jphot.2011.2165205

Cited by 38 publications

(49 citation statements)

References 24 publications

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“…It is worth noting here that the overall shape of the P1 region in Fig. 6 is similar to some of those presented in [28], especially Fig. 5(b) of [28], although somewhat different parameter values were used.…”

Section: Bifurcation Scenariossupporting

confidence: 57%

“…Simulations using the SFM have achieved good agreement with the experimental results [27]. Additionally, rich instabilities in spin VCSELs have also been theoretically analyzed with the full SFM equations [28], where the largest Lyapunov exponent (LLE) is used to determine regions of stability and instability. The nonlinear polarization dynamics including chaos in spin VCSELs has been investigated experimentally and/or simulated theoretically, but here we examine and explain its bifurcations.…”

Section: Introductionmentioning

confidence: 64%

“…Note that the reason why we only deal with the three parameters in Eq. (9) is because they are usually much larger than other parameters of the SFM [17,18,21,23,28].…”

Section: Steady-state Operationmentioning

confidence: 99%

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Stability and bifurcation analysis of spin-polarized vertical-cavity surface-emitting lasers

Susanto

Cemlyn

et al. 2017

Phys. Rev. A

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A detailed stability and bifurcation analysis of spin-polarized vertical-cavity surface-emitting lasers (VCSELs) is presented. We consider both steady-state and dynamical regimes. In the case of steady-state operation, we carry out a small-signal (asymptotic) stability analysis of the steady-state solutions for a representative set of spin-VCSEL parameters. Compared with full numerical simulation, we show this produces surprisingly accurate results over the whole range of pump ellipticity, and spin-VCSEL bias up to 1.5 times the threshold. We then combine direct numerical integration of the extended spin-flip model and standard continuation technique to examine the underlying dynamics. We find that the spin VCSEL undergoes a period-doubling or quasiperiodic route to chaos as either the pump magnitude or polarization ellipticity is varied. Moreover, we find that different dynamical states can coexist in a finite interval of pump intensity, and observe a hysteresis loop whose width is tunable via the pump polarization. Finally we report a comparison of stability maps in the plane of the pump polarization against pump magnitude produced by categorizing the dynamic output of a spin VCSEL from time-domain simulations, against supercritical bifurcation curves obtained by the standard continuation package AUTO. This helps us better understand the underlying dynamics of the spin VCSELs.

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Section: Bifurcation Scenariossupporting

confidence: 57%

Section: Introductionmentioning

confidence: 64%

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Stability and bifurcation analysis of spin-polarized vertical-cavity surface-emitting lasers

Susanto

Cemlyn

et al. 2017

Phys. Rev. A

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“…Various forms of instability are predicted to occur in spin-VCSELs, including periodic oscillations, polarisation switching and chaotic dynamics [5]. Triggerable, ultrafast (11.6 GHz) circular polarization oscillations that decay in a few nanoseconds have been experimentally observed in an 850 nm VCSEL with hybrid excitation (D.C. electrical plus pulsed circularly-polarized optical pumping) [6].…”

Section: Introductionmentioning

confidence: 99%

Spin-flip model of spin-polarized vertical-cavity surface-emitting lasers: Asymptotic analysis, numerics, and experiments

et al. 2015

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The spin-flip model describing optically pumped spin-polarized vertical-cavity surface-emitting lasers is considered. The steady-state solutions of the model for elliptically-polarised fields are studied. Asymptotic analysis for the existence and stability of the steady-state solutions is developed, particularly in the presence of pump polarisation ellipticity. The expansion is with respect to small parameters representing the ellipticity and the difference between the total pump power and the lasing threshold. The analytical results are then confirmed numerically, where it is obtained that generally one of the steady-state solutions is stable while the other is not. The theoretical results are shown to be in qualitative agreement with the experiments.

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“…Through the angular momentum transfer, the injection of spin-polarized carriers leads to a stimulated emission of circularly polarized light [28][29][30][31]. Spin lasers offer an improved performance, such as a threshold reduction for lasing, an enhanced bandwidth, and reduced parasitic frequency modulation, as compared to their conventional (spin-unpolarized) counterparts [32][33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Graphene spintronics: Spin injection and proximity effects from first principles

et al. 2014

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Ferromagnet/graphene (F/Gr) junctions are important building blocks for graphene spintronics. While simple models of spin injection are very successful for macroscopic metallic junctions, they reveal many deficiencies in describing F/Gr junctions. First-principles methods are key to assess such Gr-based junctions, but the computational cost is often too high. We focus on Ni(111)/Gr junctions and include van der Waals interactions from first principles, crucial for their correct description. We formulate a computationally inexpensive model to examine the nonuniformity and bias dependence of spin injection and elucidate proximity effects using spin polarization maps. Our results could extend the applicability of simple spin injection models in F/Gr junctions.

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Instabilities in Spin-Polarized Vertical-Cavity Surface-Emitting Lasers

Cited by 38 publications

References 24 publications

Stability and bifurcation analysis of spin-polarized vertical-cavity surface-emitting lasers

Stability and bifurcation analysis of spin-polarized vertical-cavity surface-emitting lasers

Spin-flip model of spin-polarized vertical-cavity surface-emitting lasers: Asymptotic analysis, numerics, and experiments

Graphene spintronics: Spin injection and proximity effects from first principles

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