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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Laser ablation of GaAs in liquid: the role of laser pulse duration
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Laser ablation of GaAs in liquid: the role of laser pulse duration

机译：液体中GaAs的激光消融：激光脉冲持续时间的作用

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摘要

The synthesis of gallium arsenide (GaAs) nanoparticles has attracted wide scientific and technological interest due to the possibility of tuning the GaAs NP (nanoparticle) band gap across the visible spectrum and their consequent use in optoelectronic devices. In recent years, laser ablation in liquid (LAL) has been widely used for the preparation of colloidal solutions of semiconducting and metallic nanoparticles, thanks to its flexibility. With the aim of highlighting the key role played by laser pulse duration on the ablation mechanism and on the properties of the obtained materials, laser ablation of a gallium arsenide target in acetone was performed using laser sources operating in two different temporal regimes: Nd: glass laser (lambda = 527 nm, pulse duration of 250 fs and frequency repetition rate of 10 Hz) and Nd: YAG laser (lambda = 532 nm, pulse duration of 7 ns and frequency repetition rate of 10 Hz). The ablation process was studied following the dynamics of the laser induced shock waves (SWs) and cavitation bubbles (CBs) by fast shadowgraphy, showing that CB dimension and lifetime is related to the laser pulse length. A characterization of the obtained materials by TEM (transmission electron microscopy) and microRaman spectroscopy have shown that quite spherical gallium oxide/GaAs nanoparticles can be obtained by nanosecond laser ablation. On the other hand, pure polycrystalline GaAs nanoparticles can be produced by using an ultrashort laser source.
机译：砷化镓（GaAs）纳米粒子的合成引起了广泛的科学和技术兴趣，因为可以在光电器件中调谐可见光谱的GaAs NP（纳米粒子）带隙并且随之而来的可能性。近年来，由于其柔韧性，液体（LAL）中的激光消融已广泛用于制备半导体和金属纳米颗粒的胶体溶液。旨在突出显示通过激光脉冲持续时间在消融机制上起作用的关键作用，并且在所得材料的性质上，使用在两个不同的时间制度中操作的激光来源进行丙酮中砷化镓靶标的激光烧蚀：Nd：玻璃激光（Lambda = 527nm，脉冲持续时间为250 fs和频率重复率10 hz）和nd：yag激光（lambda = 532nm，脉冲持续时间为7 ns和10 hz的频率重复率）。通过快速影像摄影激光诱导冲击波（SWS）和空化气泡（CBS）的动力学进行研究，显示CB尺寸和寿命与激光脉冲长度有关。通过TEM（透射电子显微镜）和微汉光谱的所得材料的表征已经示出了通过纳秒激光烧蚀可以获得相当球形氧化镓/ GaAs纳米粒子。另一方面，可以通过使用超微激光源生产纯多晶GaAs纳米颗粒。

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