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We report on the morphological effects induced by the inhomogeneousabsorption of radially polarized femtosecond laser irradiation of nickel (Ni)in sub-ablation conditions. A theoretical prediction of the morphology profileis performed and the role of surface plasmon excitation in the production ofself-formed periodic ripples structures is evaluated. Results indicate asmaller periodicity of the ripples profile compared to that attained underlinearly polarized irradiation conditions. A combined hydrodynamical andthermoelastic model is presented in laser beam conditions that lead to materialmelting. The simulation results are presented to be in good agreement with theexperimental findings. The ability to control the size of the morphologicalchanges via modulating the beam polarization may provide an additional routefor controlling and optimizing the outcome of laser micro-processing

Ripple formation on Nickel irradiated with radially polarized femtosecond beams