Focused ion beam optical patterning of ta-C films
Focused ion beam optical patterning of ta-C films
Tsvetkova, T.; Berova, M.; Sandulov, M.; Kitova, S.; Avramov, L.; Boettger, R.; Bischoff, L.
Optical contrast formation by Ga+ ion implantation has been made use of for focused ion beam (FIB) writing of nano-scale optical patterns in tetrahedral amorphous carbon (ta-C). Initial UV-VIS optical spectroscopy results with Ga+ broad-beam ion implantation have shown well expressed ion beam induced photo-darkening effect in thin ta-C films. It is manifested by a significant shift of the optical absorption edge to lower photon energies as obtained from optical transmission measurements of ta-C samples, implanted with Ga+ at ion energy E = 20 keV and ion fluences D = 3e14 and 3e15 cm-2. This shift is accompanied by a considerable increase of the absorption coefficient (photo-darkening effect) in the measured photon energy range (0.5÷3.0 eV). The obtained optical contrast (between implanted and unimplanted film material) could be made use of in the area of high-density optical data storage using focused Ga+ ion beams. The underlying structural modifications, induced by the Ga+ ion bombardment, have been investigated by x-ray photo-electron spectroscopy (XPS), transmission (TEM) and scanning (SEM) electron microscopy measurements. Focused ion beam (FIB) implanted patterns in ta-C samples, obtained with a fluence of 5e15 cm-2, are also presented.
Keywords: Tetrahedral amorphous carbon; Focused ion beams; Optical data storage
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
Related publications
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 22720) publication
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Lecture (Conference)
19th International Conference on Surface Modification of Materials by Ion Beams (SMMIB - 2015), 22.-27.11.2015, Chiang Mai, Thailand -
Surface & Coatings Technology 306(2016), 341-345
DOI: 10.1016/j.surfcoat.2016.07.088
Cited 1 times in Scopus
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