期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 106, 期 3, 页码 567-574出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-011-6705-5
关键词
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资金
- National Natural Science Foundation of China [60908007, 11174195]
- Shanghai Institutions of Higher Learning, Science, and Technology Commission of Shanghai municipal [09530501100]
- Shanghai Leading Academic Discipline Project [S30105]
In this paper, we report an evolution of surface morphology of silver film irradiated by a 1 kHz femtosecond laser. By SEM observations, it is noted that different nanostructures with respective surface features depend highly on the number of pulses and the laser fluence. Especially when the laser fluence is below the threshold fluence of film breakdown, a textured nanostructure including many nanobumps and nanocavities will appear on the surface of silver film. In order to determine an optimal regime for nanostructuring silver film and to further study the underlying mechanism, we perform a quantitative analysis of laser fluence and pulse number. The results show that this nanostructure formation should be due to a sequential process of laser melting, vapor bubbles bursting, heat stress confinement, and subsequent material redistribution. As a potential application, we find this nanostructured silver film can be used as the active substrate for surface enhanced Raman scattering effect.
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