Naslov
Spontaneous evolution of nanotips on silicon surface below the laser ablation threshold

Autori
Lugomer, Stjepan ; Maksimović, Aleksandar ; Karacs, Albert ; Peto, Gabor

Izvornik
Applied surface science (0169-4332) 257 (2011), 17; 7851-7855

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

Ključne riječi
silicon ; surface structure ; surface nanopatterning ; nonlinear dynamics ; solitons ; laser interaction

Sažetak
A low power density single-pulse laser irradiation of the Si surface has been used for the study of formation and selforganization of silicon nanotips. A two dimensional regular array of hillock-like nanotips has been created in the central region, a disturbed array comprising crossed lines of hillocks in the near-central region, and the “V”-shaped array in the peripheral region. Therefore, the long-range organization of hillocks changes from the center toward the periphery, following the Gaussian-like laser power profile. The evolution of hillocks due to the flow instability of molten silicon is equivalent to the instability of a liquid layer falling down a vertical plate. The novel result is that the hillock-like soliton structures can be identified with the lump solitons resulting from the nonlinear hydrodynamic instability evolution.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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