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

► Spontaneous evolution of 2D array of Si nanotips under laser irradiation of silicon surface. ► The equidistant nanotips are organized into a square, and the “ V”-shaped patterns. ► The nanotips evolve from the nonlinear flow instability of molten Si layer. ► These localized structures may be ident...

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Bibliographic Details
Published in:Applied surface science 2011-06, Vol.257 (17), p.7851-7855
Main Authors: Lugomer, S., Maksimović, A., Karacs, A., Peto, G.
Format: Article
Language:English
Subjects:
Arrays
Clusters, nanoparticles, and nanocrystalline materials
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Electron and ion emission by liquids and solids
impact phenomena
Evolution
Exact sciences and technology
Impact phenomena (including electron spectra and sputtering)
Instability
Laser interaction
Laser-beam impact phenomena
Materials science
Nanomaterials
Nanoscale materials and structures: fabrication and characterization
Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
Nanostructure
Nonlinear dynamics
Other topics in nanoscale materials and structures
Physics
Silicon
Solitons
Stability
Structure of solids and liquids
crystallography
Surface nanopatterning
Surface structure
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Summary:► Spontaneous evolution of 2D array of Si nanotips under laser irradiation of silicon surface. ► The equidistant nanotips are organized into a square, and the “ V”-shaped patterns. ► The nanotips evolve from the nonlinear flow instability of molten Si layer. ► These localized structures may be identified as the lump solitons. A low power density single-pulse laser irradiation of the Si surface has been used for the study of formation and self-organization 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.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2011.04.045