Towards high-frequency operation of spin-lasers
Towards high-frequency operation of spin-lasers
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迈向自旋激光器的高频操作
DOI：
10.1103/physrevb.92.075311
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
I. Zutic
中科院分区：
文献类型：
--
作者：
P.E. Faria Junior;J. Lee;N.C. Gerhardt;G.M. Sipahi;I. Zutic
将自旋极化载流子注入半导体激光器提供了重要的机会，以扩展自旋电子器件的已知知识，并克服传统（自旋非极化）激光器的许多限制。通过建立一个基于量子阱激光器中精确电子结构的自旋相关光学增益的微观模型，我们研究了自旋极化载流子、载流子密度和谐振腔设计如何改变其工作特性。我们发现，通过施加单轴应变，有可能获得大的双折射。虽然这种双折射在传统激光器中被认为是有害的，但它可以使自旋激光器中的发射光实现快速偏振振荡，这可以用于光通信和高性能互连。由此产生的振荡频率（GHz）将显著超过常规激光器中可能的频率范围。
Injecting spin-polarized carriers into semiconductor lasers provides important opportunities to extend what is known about spintronic devices, as well as to overcome many limitations of conventional (spin-unpolarized) lasers. By developing a microscopic model of spin-dependent optical gain derived from an accurate electronic structure in a quantum-well-based laser, we study how its operation properties can be modified by spin-polarized carriers, carrier density, and resonant cavity design. We reveal that by applying a uniaxial strain, it is possible to attain a large birefringence. While such birefringence is viewed as detrimental in conventional lasers, it could enable fast polarization oscillations of the emitted light in spin lasers, which can be exploited for optical communication and high-performance interconnects. The resulting oscillation frequency (GHz) would significantly exceed the frequency range possible in conventional lasers.