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arXiv 2104.01166physics.optics
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Au纳米粒子等离子体超快弛豫动力学的温度标定

Thermometric Calibration of the Ultrafast Relaxation Dynamics in Plasmonic Au Nanoparticles

Marzia Ferrera, Giuseppe Della Valle, Maria Sygletou, Michele Magnozzi, Daniele Catone, Patrick O'Keeffe, Alessandra Paladini, Francesco Toschi, Lorenzo Mattera… 展开作者

Marzia Ferrera, Giuseppe Della Valle, Maria Sygletou, Michele Magnozzi, Daniele Catone, Patrick O'Keeffe, Alessandra Paladini, Francesco Toschi, Lorenzo Mattera, Maurizio Canepa, Francesco Bisio

摘要:

超短激光脉冲对等离子体纳米粒子的激发启动了一个复杂的超快弛豫过程,该过程涉及系统的电子气、晶格和环境的逐渐重新平衡。研究这些过程的主要障碍之一是缺乏对系统子组件的动态温度演变的直接测量。我们测量了超短脉冲激发后的等离子体Au纳米粒子的集合的动态光学响应,并将其与相应的静态光学响应作为热力学浴温度升高的函数进行了比较。评估这两组数据,可以清楚地识别平衡或非平衡响应的光学指纹,使我们能够提取弛豫过程的动态测温校准尺度,得到等离子体粒子的实验超快温度演化作为时间的函数。

英文摘要:

The excitation of plasmonic nanoparticles by ultrashort laser pulses sets in motion a complex ultrafast relaxation process involving the gradual re-equilibration of the system's electron gas, lattice and environment. One of the major hurdles in studying these processes is the lack of direct measurements of the dynamic temperature evolution of the system subcomponents. We measured the dynamic optical response of ensembles of plasmonic Au nanoparticles following ultrashort-pulse excitation and we compared it with the corresponding static optical response as a function of the increasing temperature of the thermodynamic bath. Evaluating the two sets of data, the optical fingerprints of equilibrium or off-equilibrium responses could be clearly identified, allowing us to extract a dynamic thermometric calibration scale of the relaxation process, yielding the experimental ultrafast temperature evolution of the plasmonic particles as a function of time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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