Abstract
Sapphire has a potential as a new generation of electronics display. However, direct processing of sapphire surface by visible or near-IR laser light is challenging since sapphire is transparent to these wavelengths. In this study, we investigate the formation of femtosecond laser-induced periodic surface structures (LIPSSs) on sapphire coated with nanolayered gold film. We found a reduced threshold by about 25 % in generating uniform LIPSSs on sapphire due to the nanolayered gold film. Different thickness of nanolayered gold films are studied, and it is shown that the change in thickness does not significantly affect the threshold reduction. It is believed that the diffusion of hot electrons in the gold films increases interfacial carrier density and electron–phonon coupling that results in a reduced threshold and more uniform periodic surface structure generation.
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Acknowledgments
This research is supported by the U.S. Army Research Office, NYSERDA, Bill & Melinda Gates Foundation, China Scholarship Council, the National Basic Research Program of China (973 Program; Grant No. 2011CB013000), and National Natural Science Foundation of China (NSFC; Grant Nos. 91123035, 91323301 and 51335011).
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Yin, K., Wang, C., Duan, J. et al. Femtosecond laser-induced periodic surface structural formation on sapphire with nanolayered gold coating. Appl. Phys. A 122, 834 (2016). https://doi.org/10.1007/s00339-016-0361-8
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DOI: https://doi.org/10.1007/s00339-016-0361-8