Abstract
We investigate the morphology change of Au film on sapphire substrate by irradiating with a 1 kHz femtosecond pulse laser. Under observation of a scanning electron microscope, a textured nanostructure was formed in the exposed area on Au film due to laser ablation and subsequent stress relaxation. This process was strongly determined by the laser intensity profile and the dynamics of molten liquid. With the increasing of laser pulses number, the Au film was broken down and then a few polarization-dependent nanoripples arranged in the same direction appeared on the sapphire surface, which may result from a spatial modulation of energy due to the interference between the incident light and the excited surface plasmon polaritons. In addition, we used an energy dispersive spectrometer to analyze the chemical composition of nanoripples on the surface and in the ablated crater, respectively. The changes of O and Al elements implied that a complicated chemical transformation participated in the nanoripples formation process. We believe that present results are very useful for the analysis of the interaction between femtosecond laser and solids, especially the film material.
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Acknowledgments
We are grateful to the helpful suggestions from Dr. Juan Song of Jiangsu University. This work was financially supported by National Natural Science Foundation of China (Grants No. 60908007, 11174195), Shanghai Natural Science Foundation (13ZR1414800) and Innovation Program of Shanghai Municipal Education Commission (12YZ002).
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Qian, M., Dai, Y., Yan, X. et al. Formation of nanostructures by an intense femtosecond pulse laser irradiating Au film on sapphire substrate. Appl. Phys. A 114, 1031–1037 (2014). https://doi.org/10.1007/s00339-014-8273-y
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DOI: https://doi.org/10.1007/s00339-014-8273-y