Abstract
The irradiation of ∼0.9-μm-thick hydrogenated amorphous carbon (a-C:H) layers deposited on silicon substrates with single femtosecond (fs) laser pulses (35 fs pulse duration, 790 nm centre wavelength) in air is studied experimentally. Irradiation spots have been generated with different peak fluences and subsequently investigated by optical topometry, micro Raman spectroscopy and microscale mechanical indentation in order to evaluate their microscopic, topographical, structural and mechanical properties (e.g. elastic modulus). By this multi-method approach, a clear separation of different effects (delamination and graphitisation) becomes possible. The joint application of mechanical and spectroscopic techniques provides unique insights into the effects of the fs-laser radiation on the carbon layer.
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Acknowledgements
The authors would like to thank B. Strauß (BAM 6.8) for the SEM characterisations. This work was supported by the German Science Foundation (DFG) under grant no. KR 3638/1-1.
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Bonse, J., Hertwig, A., Koter, R. et al. Femtosecond laser pulse irradiation effects on thin hydrogenated amorphous carbon layers. Appl. Phys. A 112, 9–14 (2013). https://doi.org/10.1007/s00339-012-7170-5
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DOI: https://doi.org/10.1007/s00339-012-7170-5