Which period ripples will form on the ablated surface: subwavelength or deep-subwavelength?

Tomas Katkus; Denver P. Linklater; Simonas Varapnickas; Stefan Lundgaard; Soon Hock Ng; Simon E. Moulton; Pierre-Louis de Assis; Stanislav Moshkalev; Mangirdas Malinauskas; Saulius Juodkazis

doi:10.1117/12.2300731

19 February 2018 Which period ripples will form on the ablated surface: subwavelength or deep-subwavelength?

Tomas Katkus, Denver P. Linklater, Simonas Varapnickas, Stefan Lundgaard, Soon Hock Ng, Simon E. Moulton, Pierre-Louis de Assis, Stanislav Moshkalev, Mangirdas Malinauskas, Saulius Juodkazis

Author Affiliations +

Proceedings Volume 10522, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVIII; 105220U (2018) https://doi.org/10.1117/12.2300731
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

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 (τ_p < 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, Denver P. Linklater, Simonas Varapnickas, Stefan Lundgaard, Soon Hock Ng, Simon E. Moulton, Pierre-Louis de Assis, Stanislav Moshkalev, Mangirdas Malinauskas, and 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); https://doi.org/10.1117/12.2300731

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KEYWORDS

Plasma

Pulsed laser operation

Interfaces

Laser applications

Picosecond phenomena

Bacteria

Dielectrics

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