Naslov
Nonlinear Waves Generated on Liquid Silicon Layer by Femtosecond Laser Pulses

Autori
Lugomer, Stjepan ; Maksimović, Aleksandar ; Geretovszky, Zsolt ; Szörényi, Tamas

Izvornik
Applied surface science (0169-4332) 285B (2013); 588-599

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
nonlinear waves; Kadomtsev-Petviashvili equation; femtosecond laser interaction; silicon surface; atomic force microscopy

Sažetak
Two-dimensional nonlinear waves are generated by multipulse femtosecond ultraviolet laser irradiation of silicon above the ablation threshold. The train of 120 ≤ N ≤ 190 pulses generates the unidirectional cnoidal-like waves as well as the Y- and X-type configurations. In the region of high laser intensity, the interaction of line solitary-like waves give rise to the complex network structure. For 200 ≤ N < 220, the transition from stable into unstable waves takes place. At the Ncritical ( ≥ 230), the catastrophic destruction of cnoidal-like and solitary-like waves, takes place. Thus, the number of pulses plays the role of the control parameter. The stable cnoidal-like and solitary-like waves in a thin layer of molten silicon are reproduced by using the Kadomtsev-Petviashvili equation with negative dispersion (KP-II), and the unstable ones by using the KP-I equation with positive dispersion.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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