dc.contributor.authorGuan, Ying Chun
dc.contributor.authorZhou, Wei
dc.contributor.authorLi, Z. L.
dc.contributor.authorZheng, H. Y.
dc.contributor.authorLim, G. C.
dc.contributor.authorHong, M. H.
dc.identifier.citationGuan, Y. C., Zhou, W., Li, Z. L., Zheng, H. Y., Lim, G. C., & Hong, M. H. (2014). Femtosecond laser-induced ripple structures on magnesium. Applied Physics A, 115(1), 13-18.en_US
dc.description.abstractTwo types of periodic surface structures including micro-ripples and nano-ripples were observed on magnesium after femtosecond laser irradiation, and the color effect was reported by scanning a single laser beam over a large area at near damage threshold fluence. Optical reflectance measurement revealed that the color effect was mainly attributed to the nano-ripples as diffraction gratings, and intensity of the color was affected by morphology of the micro-ripples. AFM and SEM images showed that orientation of the micro-ripples was parallel to laser polarization and the period of the micro-ripples increased with scanning numbers, while the orientation of the nano-ripples was perpendicular to laser polarization and the period of the nano-ripples kept constant as laser sub-wavelength with increasing scanning numbers. These results suggested that formation of the micro-ripples was due to the combined effect of initial surface roughness and near-field interference, while formation of the nano-ripples was caused by the near-field interference between incident light and surface plasmons being excited in the air and metal interface. The potential application of such an effect is further proposed.en_US
dc.description.sponsorshipASTAR (Agency for Sci., Tech. and Research, S’pore)en_US
dc.format.extent14 p.en_US
dc.relation.ispartofseriesApplied Physics Aen_US
dc.rights© 2013 Springer-Verlag Berlin Heidelberg. This is the author created version of a work that has been peer reviewed and accepted for publication by Applied Physics A, Springer-Verlag Berlin Heidelberg. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1007/s00339-013-7927-5].en_US
dc.subjectSurface roughness
dc.subjectUltrashort pulses
dc.titleFemtosecond laser-induced ripple structures on magnesiumen_US
dc.typeJournal Article
dc.contributor.researchSingapore Institute of Manufacturing Technologyen_US
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.description.versionAccepted versionen_US

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