金属纳米薄膜微尺度热输运过程实验研究

AN EXPERIMENTAL INVESTIGATION OF ENERGY TRANSPORT OF METAL FILM

本文应用飞秒激光泵浦-探测技术对金属纳米薄膜微尺度能量输运过程进行了研究.在此系统中,我们采用低能量密度泵浦光进行加热,测量了纳米金膜在一个脉宽为140 fs的激光脉冲作用后,其非平衡电子温度在几个皮秒内随时间的变化.分别用一步抛物模型、两步抛物模型以及双相滞模型和实验结果进行了对比.结果表明,实验结果和两步抛物模型数值模拟结果吻合良好.

Pump-and-probe technique is used to study the energy transport of nano-size gold film with lower pump intensity. In this experiment the laser pulse duration is 140 fs and the max electron temperature change is less than 10 K. In this paper, we give the comparison of experimental results with predicted results from the POS model, the PTS model and the DPL model. The comparison shows that the POS model and the DPL model fail to predict these experimental results and the PTS model agrees well with the measure data.