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

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 ele...

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Bibliographic Details
Published in:Laser physics letters 2017-02, Vol.14 (2), p.26101
Main Authors: Dar, Mudasir H, Saad, Nabil A, Sahoo, Chakradhar, Naraharisetty, Sri Ram G, Desai, Narayana Rao
Format: Article
Language:English
Subjects:
laser material processing
molybdenum
nano-grating
ultrafast laser pulses
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Summary: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.
ISSN:1612-2011
1612-202X
DOI:10.1088/1612-202X/aa5129