Time-resolved imaging of flyer dynamics for femtosecond laser-induced backward transfer of solid polymer thin films
Time-resolved imaging of flyer dynamics for femtosecond laser-induced backward transfer of solid polymer thin films
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DOI：
10.1016/j.apsusc.2016.11.120
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发表时间：
2017-02-28
影响因子：
6.7
通讯作者：
Eason, R. W.
中科院分区：
文献类型：
--
作者：
Feinaeugle, M.;Gregorcic, P.;Eason, R. W.
用时间分辨阴影照相法研究了激光诱导后向转移(LIBT)聚合物飞片的传输机制和动力学。激光脉冲到达后，在Ge和硅载流子衬底上对3.8m和6.4µm厚的SU-8聚合物薄膜的LIBT的飞片发射阶段进行了成像，时间延迟范围为1.4MU-16.4MU·S。实验使用数字微镜装置空间成形的150飞秒、800 nm的脉冲，激光通量高达3.5J/cm(2)，同时通过CCD相机和火花放电灯记录图像。在6-20m/S范围内发现的飞片的速度以及完整和破碎的射出区域是供体厚度、载流子和激光通量的函数。转移后施主的弹坑轮廓和由此产生的飞片轮廓表明，对于硅载流子和高通量，不同的飞片喷射模式。这些结果有助于更好地理解LIBT过程，并有助于确定完整沉积物LIBT成功的实验参数。(C)2016年提交人。爱思唯尔出版公司(Elsevier B.V.)
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.