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A metalens for detecting fractional-order optical vortices
A.G. Nalimov 1,2, V.V. Kotlyar 1,2, Y.V. Khanenko 1,2, S.D. Poletaev 1,2

1 Image Processing Systems Institute, NRC "Kurchatov Institute",
443001, Samara, Russia, Molodogvardeyskaya 151;
2 Samara National Research University,
443086, Samara, Russia, Moskovskoye Shosse 34

 PDF, 2083 kB

DOI: 10.18287/2412-6179-CO-1435

Pages: 342-348.

Full text of article: Russian language.

Abstract:
In this work, a metalens for detecting an incident field with a fractional topological charge ranging from – 2 to 0 is proposed. The metalens is based on a spiral zone plate with a topological charge of 1.5. A change in the topological charge of the incident beam is numerically shown to lead to an off-axis shift of the focal spot from the center, with the intensity maximum value also changing. This results in a 6.9-fold change in the on-axis intensity while the topological charge of the incident beam changes from –0.6 to –1.5. The on-axis intensity at the focus is also shown to be affected by the rotation of the fractional vortex beam. This makes it possible to use the proposed metalens for measuring the angle of rotation of the incident beam in the range from 0 to 110°.

Keywords:
topological charge, fractional optical vortex, multifocal metalens.

Citation:
Nalimov AG, Kotlyar VV, Khanenko YV, Poletaev SD. A metalens for detecting fractional-order optical vortices. Computer Optics 2024; 48(3): 342-348. DOI: 10.18287/2412-6179-CO-1435.

Acknowledgements:
The work was partly funded by the Russian Science Foundation under grant #23-12-00236 (Sections “Design of a metalens” and “Numerical simulation”) and the RF Ministry of Science and Higher Education within a state contract of the FRC "Crystallography and Photonics" RAS (Sections “Introduction” and “Conclusion”).

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