Novel closed-form solution for spin-polarization in quantum dot VCSEL

Qasaimeh, O.

doi:10.1016/j.optcom.2015.04.008

Cited by 12 publications

(9 citation statements)

References 29 publications

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“…For 3 periods, the total length of the device is 1710 µm. The device parameters, obtained from the literature, are given in Table 1 [15][16][17]. The Bragg wavelength is chosen to be equal to the QD ground-state wavelength and the device operates at 0.98 of the threshold conditions.…”

Section: Resultsmentioning

confidence: 99%

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Multichannel and Multistate All-Optical Switch Using Quantum-Dot and Sample-Grating Semiconductor Optical Amplifier

Qasaimeh

2018

Electronics

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A novel type of multichannel and multistate all-optical switch using a single sample-grating quantum-dot-distributed feedback semiconductor optical amplifier has been proposed and theoretically demonstrated. The multichannel device, which operates below threshold, utilizes cross-gain modulation and the sample-grating technique. The multichannel outputs are strongly coupled and are utilized to get multistability at several wavelength channels. Three logic states can be obtained when the inputs are properly detuned to the sample-grating comb modes. The three logic states, which exhibit reasonable gain, are separated by wide hysteresis width and can be tuned to a different wavelength channels. The device characteristics are very useful for building all-optical logic gates, flip-flops, and decision circuits.

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Section: Resultsmentioning

confidence: 99%

“…Carrier transport between the dot states is determined by capture/escape rates, spontaneous-emission rate, and stimulated-emission rate. The rate equation for electrons in the k-th energy state for subsection ε will be written as [15]:…”

Section: Theorymentioning

confidence: 99%

Multichannel and Multistate All-Optical Switch Using Quantum-Dot and Sample-Grating Semiconductor Optical Amplifier

Qasaimeh

2018

Electronics

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“…In this work, the numerical model used to simulate the behavior of the single section InAs/GaAs QD s-VCSEL is based on the electron-hole QD Spin Flip Model presented in [23][24][25]. In this model, the conduction band of the QD s-VCSEL consists of three non-degenerate energy levels, designated as the Ground State (GS), the First Excited State (ES1) and the Second Excited State (ES2).…”

Section: Qd Materials Numerical Modelmentioning

confidence: 99%

“…These states are accompanied by an extra 2D Wetting Layer (WL) and are separated by 60meV. On the other hand, the valance band comprises five non-degenerate energy levels, one GS and four ES (ES1, ES2, ES3 and ES4) contrary to [23] and [24] which uses eight states, one GS and seven ES. This modification is done to simplify our model and it is in accordance with other electron-hole QD models such as [26].…”

Section: Qd Materials Numerical Modelmentioning

confidence: 99%

Time-delayed reservoir computing based on a dual-waveband quantum-dot spin polarized vertical cavity surface-emitting laser

Skontranis

Sarantoglou

Bogris

et al. 2022

Opt. Mater. Express

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In this work we present numerical results concerning a time-delayed reservoir computing scheme, where its single nonlinear node, is a Quantum-Dot spin polarized Vertical Cavity Surface-Emitting Laser (QD s-VCSEL). The proposed photonic neuromorphic scheme, exploits the complex temporal dynamics of multiple energy states present in quantum dot materials and uses emission from two discrete wavebands and two polarization states, so as to enhance computational efficiency. The benchmark task used for this architecture, is the equalization of a distorted 25Gbaud PAM-4 signal after 50Km of transmission at 1550nm. Results confirm that although typical ground-state emitting quantum-dot nodes offer limited performance, due to bandwidth limitations; by exploiting dual emission, we achieved a onehundred-fold improvement in bit-error rate. This performance boost can pave the way for the infiltration of quantum-dot based devices in high-speed demanding neuromorphic driven applications.

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“…The spin-up and spin-down populations of holes in the dots and wetting layer can also be included [12,13], although in most cases it is adequate to assume that the spin relaxation of holes is instantaneous. Also, carrier populations in excited states of the dots can be included in a more general model [14,15]. Our group has developed a model [16,17] that, whilst only retaining equations for the minimum number of carrier populations, has included the addition of birefringence and dichroism in the equations for the electric fields to extend the well-known spin-flip model (SFM) [18] to deal with QD spin-lasers.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Quantum-Dot Spin-VCSELs

Alexandropoulos

Susanto

et al. 2016

Electronics

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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.

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Novel closed-form solution for spin-polarization in quantum dot VCSEL

Cited by 12 publications

References 29 publications

Multichannel and Multistate All-Optical Switch Using Quantum-Dot and Sample-Grating Semiconductor Optical Amplifier

Multichannel and Multistate All-Optical Switch Using Quantum-Dot and Sample-Grating Semiconductor Optical Amplifier

Time-delayed reservoir computing based on a dual-waveband quantum-dot spin polarized vertical cavity surface-emitting laser

Stability Analysis of Quantum-Dot Spin-VCSELs

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