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20 June 2024 High aspect ratio nanopillars in single shot from femtosecond higher-order Bessel beams
Valeria V. Belloni, Mostafa Hassan, Luca Furfaro, Lilian Franchois, Remo Giust, François Courvoisier
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Proceedings Volume PC13005, Laser + Photonics for Advanced Manufacturing ; PC130050Q (2024) https://doi.org/10.1117/12.3017551
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
Ultrafast higher-order Bessel beams have diverse applications, including creating high aspect ratio nanovoids and efficient glass cutting. This study introduces a novel method using higher-order Bessel beams to generate high-aspect ratio nanostructures vertically standing on sapphire with a single ultrafast laser pulse. The elongated nano-pillars exceed 15 μm in height and possess a sub-micrometer diameter. We propose a mechanism that explains the different generation regimes. Depending on deposited energy density, either material translation or hydrodynamics occur and produce different morphologies. Our conclusions are supported by transmission electron microscopy. This approach, applicable to various transparent materials, stands out for its simplicity and deepens understanding of ultrafast laser-material interactions, holding potential for advanced material processing.
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Valeria V. Belloni, Mostafa Hassan, Luca Furfaro, Lilian Franchois, Remo Giust, and François Courvoisier "High aspect ratio nanopillars in single shot from femtosecond higher-order Bessel beams", Proc. SPIE PC13005, Laser + Photonics for Advanced Manufacturing , PC130050Q (20 June 2024); https://doi.org/10.1117/12.3017551
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KEYWORDS
Bessel beams
Femtosecond phenomena
Ultrafast phenomena
Laser nanostructuring
Laser-matter interactions
Sapphire
Solids
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