Ablation and cone formation mechanism on CR-39 by ArF laser irradiation

Abstract

Articles you may be interested inThe role of asymmetric excitation in self-organized nanostructure formation upon femtosecond laser ablation AIP Conf.Submicron surface patterning by laser ablation with short UV pulses using a proximity phase mask setup J. Appl. Phys. 107, 063106 (2010); 10.1063/1.3331409High-resolution observations of an amorphous layer and subsurface damage formed by femtosecond laser irradiation of siliconIn this work, chemical properties, surface modification, and micro structures formation on ablated polyallyl di-glycol carbonate (CR-39) polymer by ArF laser irradiation (k ¼ 193 nm) at various fluences and pulse number were investigated. CR-39 samples have been irradiated with an ArF laser (193 nm) at a repetition rate of 1 Hz. Threshold fluence of ablation and effective absorption coefficient of CR-39 were determined. Conical microstructures (Taylor cone) formed on laser-ablated CR-39 exhibit: smooth, Taylor cone shape walls and sharp tips together with interference and well defined fringe-structure with a period of 230 nm, around cone base. Mechanism of cone formation and cone evolution of CR-39 ablated surface were investigated by change of fluences (at a given pulse number) and pulse number (at a given fluence). Cone height, cone base, and region of interface were increased in micrometer steps by increasing the total fluence. Depression on the base of the cone and the circular fringe were simulated. FTIR spectra were measured and energy dispersive x-ray analysis of irradiated and un-irradiated samples was performed. V C 2015 AIP Publishing LLC.