Formation of silicon nanostructures when a target is ablated by a quasi-continuous laser pulse

Аксенов В.П., Воронов В.В., Каск Н.Е., Лексина Е.Г., Михайлова Г.Н., Мичурин С.В., Федоров Г.М. Формирование наноструктур кремния при абляции мишени квазинепрерывным лазерным импульсом // Оптический журнал. 2008. Т. 75. № 6. С. 43–49.

Aksenov V.P., Voronov V.V., Kask N.E., Leksina E.G., Mikhailova G.N., Michurin S.V., Fedorov G.M. Formation of silicon nanostructures when a target is ablated by a quasi-continuous laser pulse [in Russian] // Opticheskii Zhurnal. 2008. V. 75. № 6. P. 43–49.

V. P. Aksenov, V. V. Voronov, G. N. Mikhaĭlova, N. E. Kask, E. G. Leksina, S. V. Michurin, and G. M. Fedorov, "Formation of silicon nanostructures when a target is ablated by a quasi-continuous laser pulse," Journal of Optical Technology. 75 (6), 378-383 (2008). https://doi.org/10.1364/JOT.75.000378

When a target is ablated in an atmosphere of an inert buffer gas by low-intensity laser radiation (no greater than 105W/cm2), nanoparticles self-assemble into low-dimensional fractal structures. The dependences of the efficiency of the self-assembly process on the composition of the silicon-silica target and the pressure of the buffer gas manifest a distinct correlation with percolation in the plasma of the laser flare. A structure with a fractal dimension of df>2 is formed most efficiently close to the three-dimensional percolation threshold pc≈0.3, where pc is the ratio of the number density of silicon atoms to the number of all the atoms in the laser flare. Close to the two-dimensional percolation threshold (pc≈0.5), fractal structures are observed with df<2, assembled on a plane. The main structural elements of the observed objects are one-dimensional structures--chains of tens of nanoparticles, with a characteristic size of about 80nm. Results of a study of fractal nanostructures by scanning electron microscope are presented, an x-ray structural analysis is carried out, and the photoluminescence is studied.