Transformation of a circularly obstructed Bessel beam by a fork-shaped grating

S. Topuzoski

doi:10.1117/12.2550970

30 December 2019 Transformation of a circularly obstructed Bessel beam by a fork-shaped grating

S. Topuzoski

Proceedings Volume 11332, International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019); 113320K (2019) https://doi.org/10.1117/12.2550970
Event: International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019), 2019, Sofia, Bulgaria

Abstract

We theoretically investigate the transformation of a nondiverging Bessel beam with phase singularity n, which is transversally obstructed by a circular aperture, in the process of its diffraction by a fork-shaped grating with integer topological charge (TC) p. Analytical expressions describing the diffracted wave field amplitude and intensity distributions are derived and analyzed. The diffracted beams are nondiverging in a defined propagation interval, which is calculated. The zeroth-diffraction-order beam has TC same as that of the incident beam. However, the TC of the higher- diffraction-order beams can be increased or reduced compared to that of the incident beam, or it can be equal to zero. Also, the expressions for the radii of the central bright spot (if the beam is without TC) and of the vortex core (if the beam is with phase singularity) are derived.

Citation Download Citation

S. Topuzoski "Transformation of a circularly obstructed Bessel beam by a fork-shaped grating", Proc. SPIE 11332, International Conference on Quantum, Nonlinear, and Nanophotonics 2019 (ICQNN 2019), 113320K (30 December 2019); https://doi.org/10.1117/12.2550970

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