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首页> 外文期刊>Applied Surface Science >Time-resolved imaging of flyer dynamics for femtosecond laser-induced backward transfer of solid polymer thin films
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Time-resolved imaging of flyer dynamics for femtosecond laser-induced backward transfer of solid polymer thin films

机译：飞秒动力学的时间分辨成像，用于飞秒激光诱导的固态聚合物薄膜的向后转移

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We have studied the transfer regimes and dynamics of polymer flyers from laser-induced backward transfer (LIBT) via time-resolved shadowgraphy. Imaging of the flyer ejection phase of LIBT of 3.8 pm and 6.4 mu m thick SU-8 polymer films on germanium and silicon carrier substrates was performed over a time delay range of 1.4-16.4 mu s after arrival of the laser pulse. The experiments were carried out with 150 fs, 800 nm pulses spatially shaped using a digital micromirror device, and laser fluences of up to 3.5 J/cm(2) while images were recorded via a CCD camera and a spark discharge lamp. Velocities of flyers found in the range of 6-20 m/s, and the intact and fragmented ejection regimes, were a function of donor thickness, carrier and laser fluence. The crater profile of the donor after transfer and the resulting flyer profile indicated different flyer ejection modes for Si carriers and high fluences. The results contribute to better understanding of the LIBT process, and help to determine experimental parameters for successful LIBT of intact deposits. (C) 2016 The Authors. Published by Elsevier B.V.
机译：我们已经研究了通过时间分辨阴影照相法从激光诱导的向后转移（LIBT）中聚合物传单的转移方式和动力学。激光脉冲到达后，在1.4-16.4μs的时间延迟范围内，进行了3​​.8 pm的LIBT的传单喷射阶段和在锗和硅载体衬底上的6.4μm厚的SU-8聚合物薄膜的成像。实验是使用数字微镜设备在空间上定型的150 fs，800 nm脉冲下进行的，激光通量高达3.5 J / cm（2），同时通过CCD相机和火花放电灯记录图像。飞行器的速度在6-20 m / s的范围内，完好无损的喷射方式是供体厚度，载体和激光能量密度的函数。转移后供体的弹坑轮廓和所得的传单轮廓表明，硅载体和高通量的传单弹出方式不同。结果有助于更好地理解LIBT过程，并有助于确定完整沉积物成功进行LIBT的实验参数。 （C）2016作者。由Elsevier B.V.发布

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