Thesis supervisor: Miklós Veres
Location of studies (in Hungarian): HUN-REN Wigner Research Centre for Physics Abbreviation of location of studies: WFK
Description of the research topic:
Diamond, which is normally considered to be a metastable form of carbon, can be converted to graphite by appropriate pulsed laser treatment. The process works both on diamond micro- and nanocrystals and nanodiamond thin films, and can be used, for example, to create electrically conductive channels in the inherently insulating diamond structure. By fine-tuning the conditions of the pulsed laser treatment, it is also possible to achieve the formation of defect sites instead of graphitic transformation in the diamond structure, with well-defined light emission properties, being important for practical applications.
The aim of the research is to create defects in nanocrystalline diamond thin films by femtosecond laser treatment: to prepare nanodiamond thin films of different morphologies and thicknesses and then perform their femtosecond laser irradiation by varying the wavelength, pulse energy and irradiation time; to determine the correlations between the structural changes and the light emission properties of the diamond and the irradiation parameters.