Micro-step localization using double charge optical vortex interferometer.
We investigate the diffraction effects of focused Gaussian beams yielding a double optical vortex by a nano-step structure fabricated in a transparent media. When approaching such a step the double vortex splits into single ones which move in a characteristic way. By observing this movement we can determine the position of the step with high resolution. Our theoretical predictions were verified experimentally.
Masajada
Jan
J
Institute of Physics, Wrocław University of Techology, Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland. Jan.Masajada@pwr.wroc.pl
Leniec
Monika
M
Drobczyński
Sławomir
S
Thienpont
Hugo
H
Kress
Bernard
B