Abstract
The self-formation of periodic subwavelength ripples by linear
polarized femtosecond laser scanning planar and non-planar tungsten
targets on the employed laser wavelength, scanning speed, and energy
fluence are examined systematically. The results show that, for a certain
laser wavelength, the scanning conditions have no obvious effect to the
morphological features of grating structures in the threshold range of
laser fluence. The spatial structured period of gratings can be
self-consistently interpreted by recently presented physical model of
surface two-plasmon resonance. The subwavelength structures on cylindrical
surface would be a good method to realize unique surface functions on
complex surface of micro-devices.
© 2016 Chinese Laser Press
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