Université de Neuchâtel

High-resolution measurement of phase singularities produced by computer-generated holograms

Rockstuhl, Carsten ; Ivanovskyy, Andrey Albert ; Soskin, Marat Samuil ; Salt, Martin Guy ; Herzig, Hans-Peter ; Dändliker, René

In: Optics Communications, 2004, vol. 242, no. 1-3, p. 163-169

We present measurements of the intensity as well as the phase distribution in the various diffraction orders of computer-generated holograms designed to generate a higher order Gauss–Laguerre beam. For the direct measurement of the phase distribution in the diffraction orders a high-resolution interferometer is used, which allows access to a lateral length scale for the localization of phase...

Université de Neuchâtel

Investigation of the basic properties of phase singularities generated by a phase bar or trench

Rockstuhl, Carsten ; Salt, Martin Guy ; Herzig, Hans-Peter

In: Optics Communications, 2004, vol. 235, no. 1-3, p. 11-21

In the present paper, we determine the conditions necessary for the generation of phase singularities in the far-field by a phase bar or a trench. The ultimate goal of our work is to link object parameters to a topological distribution of pairs of singularities. We apply scalar theory and show that objects smaller than the diffraction limit are not capable of generating singularities....

Université de Neuchâtel

Theoretical and experimental investigation of phase singularities generated by optical micro- and nano-structures

Rockstuhl, Carsten ; Salt, Martin Guy ; Herzig, Hans-Peter

In: Journal of Optics A: Pure and Applied Optics, 2004, vol. 6, no. 5, p. 271-276

Phase singularities appear in the diffracted far-field of an optical micro-structure if the object is of a sufficient lateral size to induce an appropriate phase delay. We present results that determine the critical dimension of a single phase bar for the generation of dislocations in the far-field. Using scalar theory, an analytical equality is derived that must be met by the structure. Because...