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AFM characterization of metallic surface Textured by Ultrashort Laser Pulses (TULP)

Bachelor thesis project: students applied and experimental physics

This 3 months student project is a part of more extended project aimed at developing processes for the fabrication of micro- and nano- structures on various materials by the use of pico-second and femto-second laser pulses. In general the results of this project will contribute to bridge the micro-nano manufacturing gap. The intriguing question is to what extent materials exposed to femtosecond laser pulses are in local thermal equilibrium of or not. The possibly non-equilibrium distribution of electrons, i.e. not governed by the usual Fermi-Dirac distribution, has important consequences for basic research and applications of laser surface engineering

Objective: The main aim of this project is to prove what kind of information may be expected from AFM characterization of metallic surfaces treated by ultrashort laser pulses and searching for basic characteristics of the roughness of these surfaces in relation to process parameters used for the samples preparation.
Experimental techniques: Surfaces of metallic samples treated by ultrashort laser pulses will be investigated by use of AFM technique in tapping mode. Statistics on surface roughness of the samples will be performed by use of WSxM software.

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Fig: Detail of a metallic surface treated by 210 fs laser pulses is displayed on left side Scanning Electron Microscope picture. Two typical periodical wavy features are observed. Bigger - regular ripples - with separation around 500 nm and horizontal orientation are clearly visible. Much smaller - small ripples – are located between regular ripples and have perpendicular orientation to them. WSxM software allow us to display the AFM measurement in 2D or 3D (right side picture) mode and to measure characteristic dimensions, mainly of the regular ripples.

Contact:
Dr. Jozef Vincenc Obona, kamer gebouw 13.018, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , Phone: 0503634890;
Dr. Vasek Ocelik, This e-mail address is being protected from spambots. You need JavaScript enabled to view it ;
Prof. dr. Jeff Th. M. De Hosson, kamer gebouw 13.041, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , Phone: 0503634898