(Color online) (a) Plots of pitch and amplitude of ripple structures as a function of beam energy. (b) AFM image of surface irradiated by 833 shots with and (c) AFM image of surface irradiated by 500 shots with . Total energy: . Laser source is picosecond pulsed laser.
(Color online) (a) Temperature-depth profile after the sample being irradiated by a Gaussian beam. (b) Temperature distribution is plotted as a function of depth from surface when laser energy was varied from every .
(Color online) Plots of grating pitch vs wavelength of irradiated beam. Solid line: and dashed line: .
(Color online) AFM images and their 2DFT images after irradiation of circularly polarized laser beam after irradiation of number of laser shots. (a) 300 shots and (b) 3000 shots. (c) Enlarged image.
(Color online) Plots of pitch of concentric ripple structure measured by 2DFT power spectrum as a function of number of laser shots.
Conditions of single beam irradiation.
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