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...

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

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...