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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Ultrafast upconversion probing of lasing dynamics in single ZnO nanowire lasers
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Ultrafast upconversion probing of lasing dynamics in single ZnO nanowire lasers

机译：ZnO纳米线激光器中激光动力学的超快上转换探测

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摘要

The ultrafast lasing dynamics of single zinc oxide nanowires are studied by time-resolved upconversion of the lasing emission as a function of the ultraviolet excitation intensity. Induction times for stimulated emission in individual nanowires are observed to be 1-5 ps or 3-15 roundtrips for nominal 20 mu m long nanowires, depending on the 267 nm excitation intensity. In separate experiments, transient absorption profiles are also obtained for time-delayed 800 and 400 nm pulses to elucidate the carrier dynamics, such as rapid decay (2-3 ps) of the electron-hole plasma (EHP) states at high carrier densities during lasing in the nanowire and the slower exciton decay component (15-60 ps) at lower excitation densities. The dynamics of the lasing wavelength dependence on carrier density is also studied and related to the band gap renormalization in the EHP regime.
机译：通过对激光发射的时间分辨上转换作为紫外激发强度的函数，研究了单氧化锌纳米线的超快激光动力学。观察到的单个纳米线中受激发射的诱导时间为1-5 ps或标称20微米长纳米线的往返行程为3-15往返，具体取决于267 nm激发强度。在单独的实验中，还获得了延时800和400 nm脉冲的瞬态吸收曲线，以阐明载流子动力学，例如在高载流子密度下电子空穴等离子体（EHP）状态的快速衰减（2-3 ps）。在较低的激发密度下发射纳米线和较慢的激子衰减分量（15-60 ps）。还研究了激光波长对载流子密度的依赖性，并与EHP方案中的带隙重归一化有关。

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