Abstract
We have investigated ablation of polymers with radiation of 13.5 nm wavelength, using a table-top laser produced plasma source based on solid gold as target material. A Schwarzschild objective with Mo/Si multilayer coatings was adapted to the source, generating an EUV spot of 5 μm diameter with a maximum energy density of ∼1.3 J/cm2. In combination with a Zirconium transmission filter, radiation of high spectral purity (2% bandwidth) can be provided on the irradiated spot. Ablation experiments were performed on PMMA, PTFE and PC. Ablation rates were determined for varying fluences using atomic force microscopy and white light interferometry. The slopes of these curves are discussed with respect to the chemical structure of the polymers. Additionally, the ablation behavior in terms of effective penetration depths, threshold fluences and incubation effects is compared to literature data for higher UV wavelength.
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Barkusky, F., Bayer, A. & Mann, K. Ablation of polymers by focused EUV radiation from a table-top laser-produced plasma source. Appl. Phys. A 105, 17–23 (2011). https://doi.org/10.1007/s00339-011-6540-8
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DOI: https://doi.org/10.1007/s00339-011-6540-8