Abstract
We report on the first evidence of direct micro-peak machining using a photonic jet (PJ) with nanosecond laser pulses. PJ is a high-concentrated propagative light beam with a full width at half maximum (FWHM) smaller than the diffraction limit. In our case, PJs are generated with a shaped optical fiber tip. Micro-peaks with a FWHM of around 1 \(\upmu\)m, a height until 590 nm and an apex radius of 14 nm, were repeatability achieved on a silicon wafer. The experiments have been carried out in ambient air using a 100/140 multimode silica fiber with a shaped tip along with a 35 kHz pulsed laser emitting 100 ns pulses at 1064 nm. This study shows that the phenomenon occurs only at low energies, just under the ablation threshold. Bulk material appears to have moved around to achieve the peaks in a self-organized process. We hypothesize that the matter was melted and not vaporized; hydrodynamic flow of molten material governed by surface-tension forces may be the causes. This surface modification has many applications. For example, this paper reports on the decrease of wettability of a textured silicon wafer.
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Acknowledgements
The authors are grateful to Camille Hairaye (ICube Laboratory, France) for her technical assistance in the use of the characterization system of wettability.
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Pierron, R., Pfeiffer, P., Chabrol, G. et al. Photonic jet: direct micro-peak machining. Appl. Phys. A 123, 686 (2017). https://doi.org/10.1007/s00339-017-1319-1
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DOI: https://doi.org/10.1007/s00339-017-1319-1