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Journal of Applied Mathematics and Statistical Applications | Volume: 1
August 23-24, 2018 | London, UK
Applied Physics
3
rd
International Conference on
H
igh intensity laser pulses can generate high densities
of electrons in matter by avalanche processes and by
deterministic multiphoton-electron coupling. The dependence
of irreversible modification thresholds on the number of
pulses, the so-called incubation, could be quantified by a new
model combining the spot size and pulse number dependence
of ablation thresholds based on optically active high-density
defects with a separation below the laser wavelength. This is
successfully demonstratedwith organic and inorganicmaterials.
Optical lithography resolution is limited by light diffraction.
Apertureless scanning near-field optical lithography (NFOL)
can overcome this barrier. There, a scanning probe microscope
tip brought down to a few nanometres from a substrate is
illuminated by a focused femtosecond laser beam. The laser
electromagnetic field is strongly enhanced at the tip-substrate
gap, producing modifications on the substrate. Thermal
contributions are discussed on the basis of heat accumulation.
Sub-wavelength structuring at the nanoscale is observed, with
lateral resolution of about 10 nm and thus surpassing the light
diffraction limit.
Speaker Biography
Wolfgang Kautek holds a diploma in chemical engineering from the Vienna University
of Technology, Austria, and a doctoral degree from the University of Technology Berlin,
Germany. He spent many years, as a research scientist at the University of Kentucky,
USA, at the Fritz-Haber-Institute of the Max-Planck-Society, Berlin, at the IBM San Jose
Research Laboratory, California, USA, and the Siemens Research Centre, Erlangen,
Germany. In 1981, he was awarded the Otto-Hahn-Medal of the Max-Planck-Society.
From 1988 until 2004, he was head of the Laboratory for Thin Film Technology
of the Federal Institute for Materials Research and Testing, Berlin, Germany.
In 2003, Wolfgang Kautek was installed as adjunct professor at the Institute of
Chemistry of the Free University Berlin, Germany. In 2004, Wolfgang Kautek
followed a call as full-professor for Physical Chemistry at the University of Vienna.
e:
wolfgang.kautek@univie.ac.atWolfgang Kautek
University of Vienna, Austria
Femtosecond laser matter interaction in the optical far and near field