CdS/CdSe/CdS球形量子阱中激发几何调制的超荧光
Superfluorescence in CdS/CdSe/CdS Spherical Quantum Wells Modulated by Excitation Geometry
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中文总结 AI 辅助
本研究在CdS/CdSe/CdS球形量子阱中实现室温超荧光，发现条纹激发可将阈值降至点激发的约1/30，证明空间扩展激发促进合作相干性，为主动控制集体发射提供新途径。
中文摘要 AI 辅助
超荧光（SF）源于初始不相干发射体之间宏观相干性的自发建立。其形成对系统中的退相和集体耦合高度敏感。在此，我们观察到CdS/CdSe/CdS球形量子阱中的室温超荧光。随着激发通量的增加，峰值发射强度呈近二次方增长，而发射延迟和脉冲宽度则减小。还观察到Burnham-Chiao振荡，揭示了超荧光特有的集体辐射动力学。进一步的条纹激发实验表明，缩短激发长度L会将主导的快发射从放大自发辐射转变为超荧光。更重要的是，条纹激发下超荧光的阈值仅为点激发下阈值的约1/30。这一大幅降低表明，空间扩展激发提供的传播辐射场有利于合作相干性的建立。这些发现为理解超快多体相干动力学提供了直接实验证据，并为在室温下主动控制集体发射提供了一条途径。
英文摘要
Superfluorescence (SF) originates from the spontaneous buildup of macroscopic coherence among initially incoherent emitters. Its formation is highly sensitive to dephasing and collective coupling in the system. Here, we observe room-temperature SF in CdS/CdSe/CdS spherical quantum wells. With increasing excitation fluence, the peak emission intensity shows a nearly quadratic increase, while the emission delay and pulse width decrease. Burnham-Chiao ringing is also observed, revealing the characteristic collective radiation dynamics of SF. Further experiments with stripe excitation show that shortening the excitation length L changes the dominant fast emission from amplified spontaneous emission to SF. More importantly, the threshold for SF under stripe excitation is only about 1/30 of that under spot excitation. This large reduction indicates that the propagating radiation field provided by spatially extended excitation favors the buildup of cooperative coherence. These findings provide direct experimental evidence for understanding ultrafast many-body coherence dynamics and offer a route to actively control collective emission at room temperature.
发表机构
- Southeast University（东南大学）
- Nantong University（南通大学）
- Nanjing University（南京大学）
机构由 AI 辅助整理，请以论文原文为准。
