Journal
OPTICS AND LASER TECHNOLOGY
Volume 69, Issue -, Pages 34-38Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2014.12.016
Keywords
Graphene; Laser irradiation; Nanoablation
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Funding
- Russian Science Foundation [14-22-00243]
- Russian Science Foundation [14-22-00243] Funding Source: Russian Science Foundation
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Multi-layered graphene deposited on silicon wafer was irradiated in air by sequences of nanosecond laser pulses. It is shown that ultra-shallow craters (cavities) with depth of similar to 1 nm and microholes can be formed in graphene sheet on the substrate at laser fluence similar to 0.04 J/cm(2) well below the experimentally known graphene ablation threshold >= 0.25 J/cm(2). Influence of intensity and number of laser pulses on the depth and roughness of the cavities are described. We suggest that the observed effects are related to laser heating and boiling of the adsorbate at graphene-silicon interface. (C) 2014 Elsevier Ltd. All rights reserved.
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