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30 December 2019 Transformation of a circularly obstructed Bessel beam by a fork-shaped grating
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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.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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