Formation of Nanocomposite Structures under Laser Irradiation λ = 1.064 µm DVD-R Coated with Aluminum Foil

Purpose. Obtaining, characterization and mathematical description of atomic force microscopic images of 1D-dimensional whisker-like nanocomposite structures formed under the conditions of high-intensity laser processing using.Formation of polycarbonate with inner thin layers of Al, semiconductor metals Si, Sb, Te, Ge, and ZnS and SiO2 compounds in a DVD-R-5 disc covered with aluminum foil.
Methods. Applied pulsed laser radiation for laser processing of DVD-R-5 was used. The methods of confocal, atomic force and scanning electron microscopy to study microand nanostructuring after laser processing of DVD-R-5 patterns were used. The direct and inverse Fourier transforms atomic force images were carried out. Analysis of solutions to the heat balance equation as applied to the results of laser processing was performed.
Results. Under high-speed exposure to laser radiation (TEM01 or TEM10 modes) on a DVD-R-5 sample coated with aluminum foil, VNS were detected and studied. With the help of direct and inverse Fourier transforms on atomic force images of the surface after laser processing, the periodicity of the formed VNS was confirmed. It is shown that the process of DVD-R-5 laser processing is adiabatic, the propagation velocity of the melting wave front exceeds the sonic one in polycarbonate. The conclusion about the formation of VNS due to self-focusing and filamentation of laser radiation in the reflected diffracting beams of each of the mode components is substantiated.
Conclusion. Under conditions of high-intensity laser processing by repetitively pulsed laser radiation with the TEM01 or TEM10 modes, 1D-dimensional VNSs are formed with a thickness at the base of up to 0.5 μm and a height of more than 1 μm, the composition of which can include both conductors, semiconductors, and their compounds. The resulting WNSs have a highly developed ordered surface structure, which may indicate that their application is promising.

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