2 May 2014 Ising simulation in polarization switching in vertical-cavity surface-emitting lasers
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An Ising simulation is used to interpret the phase transition in the polarization switching (PS) of vertical-cavity surfaceemitting lasers (VCESLs) in this paper. From a point of view of spatial coherence, a simulation with Gaussiandistribution interaction shows a weak first-order phase transition for disorder-to-order transition due to the inhomogeneous interaction in space. For the order-to-order transition in the VCESL’s polarization switching (VPS), the Ising simulation with an external field could give an appropriate description to understand the interaction in VPS and suggest VPS is a first order phase transition (FOPT). Furthermore, via comparing with the Ising model with an external field, the interaction in VPS system should be strong enough to make whole system be in a spontaneous order state. Moreover, there is an injected signal related to injected current in VPS system and playing a role as external field in Ising model. This injected signal could cause the two degenerate states separate into a metastable state and a stable state. The last results which is modulating iteration times of Ising simulation with an external field indicates that the variation of the PS currents regarding the modulation frequency is a dynamical result. This investigation would give numerous contributions for understanding the phase transition and the interaction in VPS’s system.
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Yueh-Chen Li, Yueh-Chen Li, Yu-Heng Wu, Yu-Heng Wu, Wang-Chuang Kuo, Wang-Chuang Kuo, Tsu-Chiang Yen, Tsu-Chiang Yen, "Ising simulation in polarization switching in vertical-cavity surface-emitting lasers", Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, 913420 (2 May 2014); doi: 10.1117/12.2052065; https://doi.org/10.1117/12.2052065

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