19 February 2018 Which period ripples will form on the ablated surface: subwavelength or deep-subwavelength?
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Nano-texturing of surface by self-organised ablation ripples as well as modifications of internal volume of materials, transparent at the wavelength of laser irradiation, is gaining interest due to simplicity of direct laser writing/printing. With ultra-short laser pulses (τp < 1 ps) a wider range of structuring morphologies is accessible, namely, sub-wavelength ripples. The surface wave formed on the plasma-dielectric (air or substrate) explains difference of the formed pattern. These corresponding front- and back-side (in respect to the incoming laser beam) modes of laser structuring accounts for the ripple formation inside transparent materials, where a skin-layer plasma is formed. Emerging applications of nano-textured surfaces for bio-medical field are discussed.
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Tomas Katkus, Tomas Katkus, Denver P. Linklater, Denver P. Linklater, Simonas Varapnickas, Simonas Varapnickas, Stefan Lundgaard, Stefan Lundgaard, Soon Hock Ng, Soon Hock Ng, Simon E. Moulton, Simon E. Moulton, Pierre-Louis de Assis, Pierre-Louis de Assis, Stanislav Moshkalev, Stanislav Moshkalev, Mangirdas Malinauskas, Mangirdas Malinauskas, Saulius Juodkazis, Saulius Juodkazis, "Which period ripples will form on the ablated surface: subwavelength or deep-subwavelength?", Proc. SPIE 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII, 105220U (19 February 2018); doi: 10.1117/12.2300731; https://doi.org/10.1117/12.2300731

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