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Thermal Field Simulation of Ag Nanoparticles Induced by Femtosecond Laser
Integrated Ferroelectrics ( IF 0.7 ) Pub Date : 2020-06-12 , DOI: 10.1080/10584587.2020.1728724
Xiaoying Ren 1, 2 , Xiao Li 1, 2 , Fengqi Wei 1, 2 , Hailong Yin 1, 2 , Yonghong Wen 1, 2
Affiliation  

Abstract The thermal field distribution of Ag nanoparticles induced by femtosecond laser is calculated by using two-temperature equation in this paper, and its characteristics of Ag nanoparticles with single layered and multi-layered were compared and analyzed. It is found that there will be a local “hot spot” in the electromagnetic coupling region of adjacent particles, because of the electron tunneling effect and the plasma model for electron transfer, the temperature gradient in this region shows a trend of increasing at the beginning and then decreasing. The influence of the thermal field mainly comes from two aspects, one is the electromagnetic coupling of the plasmon mode, the other is the “cumulative effect” of temperature, and with the increase of irradiation time, the influence of the laser energy accumulation becomes more and more obvious on the thermal field distribution. At the same time, the results show that the smaller Ag nanoparticles will have higher temperature and temperature gradient with the same laser energy. It is also found that the electron and lattice temperature of Ag nanoparticles will reach the thermodynamic equilibrium distribution in 20 to 30 picoseconds.

中文翻译:

飞秒激光诱导银纳米粒子的热场模拟

摘要 本文利用双温度方程计算了飞秒激光诱导纳米银的热场分布,比较分析了单层和多层纳米银的特性。发现相邻粒子的电磁耦合区域会存在局部“热点”,由于电子隧穿效应和电子转移的等离子体模型,该区域的温度梯度在开始时呈增大趋势。然后减少。热场的影响主要来自两个方面,一是等离子体模式的电磁耦合,二是温度的“累积效应”,随着辐照时间的增加,激光能量积累对热场分布的影响越来越明显。同时,结果表明,在相同的激光能量下,较小的Ag纳米粒子将具有更高的温度和温度梯度。还发现Ag纳米颗粒的电子和晶格温度将在20至30皮秒内达到热力学平衡分布。
更新日期:2020-06-12
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