Ultrafast laser-induced reproducible nano-gratings on a molybdenum surface

Abstract

Wavelength-dependent reproducible nano-gratings were produced on a bulk molybdenum surface upon irradiation with femtosecond laser pulses at near normal incidence in ambient air and water environments. The surface morphology of the irradiated surfaces was characterized by field emission scanning electron microscopy. The ripple spacing was observed to decrease by half when the surface was irradiated with the second harmonic of the fundamental 800 nm radiation. Careful choice of the laser parameters such as fluence, scanning speed, polarization and wavelength were observed to be important for the formation of smooth periodic ripples. The mechanism of formation of polarization-dependent periodic ripples is explained based on the interference model. We also demonstrated the use of a laser direct writing technique for the fabrication of periodic subwavelength structures that have potential applications in photonic devices.

Carbonized Hybrid Micro/Nanostructured Metasurfaces Produced by Femtosecond Laser Ablation in Organic Solvents for Biomimetic Antireflective Surfaces

“…Because there has been only very limited research − regarding the fundamental aspects and applications of hybrid UHSFLs/LSFLs, many challenging issues still remain unexamined.…”

Triangular laser-induced submicron textures for functionalising stainless steel surfaces

“…Another approach is the two-step processing employing a train of pulses or multiple passes with varying relative orientation of the scans in regard to the polarisation direction that lead to square-or diamond-shaped LIPSS. Superimposition of LIPSS can occur with significantly less fluence per pulse than that used in the initial pulses [9,23,24].…”

Nanogratings Formation in a System of Ultra-short Laser Pulses – Metalloorganic Gas – Deposited Metal – Sapphire in Sinergetic Interference Field with Waveguide Modes Participation

“…This superanomalous skin effect of the surface plasmon polaritons in metals is conditioned by non-locality and singularity of dielectric permittivity of metals. Note that anomalous nanogratings with period D=20 nm have been experimentally found out on surface of molybdenum, which is close to tungsten by its properties, under irradiation by a set of linear polarized femtosecond laser pulses ( =800 nm) [11].…”