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Ⅲ-Nitride multiple disk-in-wire laser structures: Effects of crystal orientation and spacer size

机译：Ⅲ-氮化物多盘线内激光器结构：晶体取向和间隔物尺寸的影响

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摘要

Atomistic numerical simulations have been carried out to study the performance of recently reported optical structures based on nonpolar multiple disk-in-wire In0.08Ga0.92N/GaN material system. The simulations are performed with an augmented version of the open-source NEMO 3-D software that uses a fully-atomistic valence force-field (VFF) for strain distributions and empirical sp(3)s*-spin tight-binding model to compute the electronic structure. Both linear and nonlinear components of internal polarization field have been included using a recently proposed first-principles based polarization model. When compared to conventional c-plane based polar structures, the nonpolar device exhibits a much weaker (yet non-zero) internal potential and improved laser emission characteristics. In particular, it is found that the optical transition probability is a strong function of the internal fields and could be tuned via engineering the spacer size.
机译：已经进行了原子数值模拟，以研究基于非极性多线盘In0.08Ga0.92N / GaN材料系统的最近报道的光学结构的性能。使用开源NEMO 3-D软件的增强版进行仿真，该软件使用全原子价态力场（VFF）进行应变分布，并使用经验sp（3）s *自旋紧束缚模型进行计算电子结构。使用最近提出的基于第一原理的偏振模型，已经包括了内部偏振场的线性和非线性分量。当与常规的基于c平面的极性结构相比时，该非极性设备显示出非常弱的（但非零）内部电势和改善的激光发射特性。特别地，发现光学跃迁概率是内部场的强函数，并且可以通过设计间隔物尺寸来调节。

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