Progress in research of dynamic properties and applications of spin-lasers
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摘要:
在半导体激光器中引入自旋极化载流子是实现室温自旋电子应用的新途径，其超越了常规的磁阻效应。自旋极化载流子的注入导致自旋激光器具有丰富的动力学行为并展示出包括高频偏振振荡和偏振混沌动力学等特性，使其在保密光通信、量子计算、光信息处理和数据存储、可重构光互联以及生物医学传感等领域具有巨大的应用潜力。梳理了近年来自旋激光器的动力学特性及其应用研究进展。介绍了自旋激光器丰富的动力学行为及混沌演变机制；随后分析了自旋激光器的高频振荡特性；归纳了基于自旋激光器动力学特性的最新应用研究进展。在此基础上，展望了自旋激光器的发展趋势和面临的挑战，为相关领域的研究和工程应用提供参考。
Abstract:An alternative approach to realizing room temperature spintronic applications is introducing spin-polarized carriers in a semiconductor laser, which is beyond the usual magnetoresistive effects. Spin lasers have been widely applied in the fields of secure optical communication, quantum computing, optical information processing, and data storage, reconfigurable optical interconnection, and biomedical sensing because the injection of spin-polarized carriers results in the rich dynamic properties of spin lasers, including high-frequency polarization oscillations and polarization chaos regimes. In this paper, the research progress of the dynamic characteristics and applications of spin lasers in recent years is reviewed. Firstly, the dynamic behavior and chaotic evolution mechanism of spin lasers are introduced. Then the high-frequency polarization oscillation characteristics of spin lasers are analyzed. Furthermore, the latest research progress of applications based on the dynamic characteristics of spin lasers is summarized. Finally, the prospects and challenges of spin lasers are expected to enlighten fundamental researches and engineering applications in the relevant fields.
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Key words:
- spintronic /
- spin laser /
- dynamic properties /
- polarization oscillation /
- polarization chaos
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图 1 自旋VCSEL的时序图
Figure 1. Intensity time sequence of the spin-VCSEL
optical field decay rate κ=300 ns−1; linear dichroism γa=0; linear birefringence γp=10π ns−1; spin-flip relaxation rate γs=30 ns−1; decay rate of N (N is normalized carrier concentration) γ=1 ns−1; linewidth enhancement factor α=3; pump ellipticity P=−0.1. The other parameters of VCSEL are the same as those in Fig. 1
图 2 同相解和反相解的临界特征值的实部与P的关系
Figure 2. The real parts of the critical eigenvalues λ for the in-phase (solid line) and out of phase (dashed line) solution as a function of P, where η=1.8
图 4 二维分岔图
Figure 4. Bifurcation diagrams (κ=230 ns−1, γa=0, γp=8.8π ns−1, γs=30 ns−1, γ=0.68 ns−1, α=4, P=−0.1 [39])
图 6 强度调制、偏振调制和自旋反转弛豫速率的影响
Figure 6. Simulated intensity modulation and polarization modulation (κ=325 ns−1, γa=0, γs=450 ns−1, γ=1 ns−1, α=5, P=0 [22])
图 7 不同偏振椭圆率下的偏振调制
Figure 7. Polarization modulation response at various polarization ellipticity (κ=325 ns−1, γa=0, γs=450 ns−1, γ=1 ns−1, α=5, η=5.4[22])
图 10 自旋VCSEL的光子微波产生系统以及光谱与频谱示意图
Figure 10. Schematic of the proposed photonic microwave generation system and optical spectra and radio-frequency spectra
feedback strength kf=1.1 ns−1 and feedback delay time τ=4 ns. κ=300 ns−1, γa=0, γs=30 ns−1, γp=40π ns−1, γ=1 ns−1, α=3, η=2, P=−0.5 [40]
图 11 主从激光器的混沌时间序列
Figure 11. Cross-correlation between the master laser and slave laser
κ=250 ns−1, γa=0, γs=30 ns−1, γp=8.8π ns−1, γ=0.68 ns−1, α=4, kinj=100 ns−1, Δf=−20 GHz, ηM,S=6, and PM,S=−0.1[71]
图 12 调制自旋VCSEL的泵浦振幅和偏振态
Figure 12. Modulated pump magnitude and polarization of the master spin-VCSEL (PM,S=−0.1)
Modulated pump magnitude of the master spin-VCSEL. Recovered message from (a) the total intensity and (c) the RCP. (b) and (d) the corresponding eye diagrams. The bit rate is 4 Gb/s. Modulated pump polarization of the master spin-VCSEL. Recovered message from (e) the total intensity and (g) the RCP. (f) and (h) the corresponding eye diagrams. The bit rate is 3 Gb/s[71]. The other parameters are the same as those in Fig. 8
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