Dynamics of femtosecond laser-induced periodic surface structures on silicon by high spatial and temporal resolution imaging
Dynamics of femtosecond laser-induced periodic surface structures on silicon by high spatial and temporal resolution imaging
复制标题
通过高空间和时间分辨率成像研究飞秒激光诱导硅上周期性表面结构的动力学
DOI：
10.1063/1.4870445
复制
发表时间：
2014-04-14
影响因子：
3.2
通讯作者：
Sun, Z. R.
中科院分区：
文献类型：
--
作者：
Jia, X.;Jia, T. Q.;Sun, Z. R.
利用共线泵浦-探测成像技术研究了飞秒激光脉冲（脉冲宽度τ = 50 fs，中心波长λ = 800 nm）诱导的周期性波纹的形成动力学，时间分辨率为1 ps，空间分辨率为440 nm。在前一个泵浦脉冲产生的表面缺陷处，当两个泵浦脉冲照射时，周期接近激光波长的波纹开始出现。飞秒激光辐照后的最初几十皮秒内出现了周期性波纹的雏形，涟漪位置保持不变，直到形成过程主要在1500 ps的时间跨度内完成。结果表明，飞秒激光脉冲与样品表面相互作用过程中激光能量的周期性沉积是形成周期性波纹的主要原因。(C)2014 AIP Publishing LLC.
The formation dynamics of periodic ripples induced by femtosecond laser pulses (pulse duration tau = 50 fs and central wavelength lambda = 800 nm) are studied by a collinear pump-probe imaging technique with a temporal resolution of 1 ps and a spatial resolution of 440 nm. The ripples with periods close to the laser wavelength begin to appear upon irradiation of two pump pulses at surface defects produced by the prior one. The rudiments of periodic ripples emerge in the initial tens of picoseconds after fs laser irradiation, and the ripple positions keep unmoved until the formation processes complete mainly in a temporal span of 1500 ps. The results suggest that the periodic deposition of laser energy during the interaction between femtosecond laser pulses and sample surface plays a dominant role in the formation of periodic ripples. (C) 2014 AIP Publishing LLC.