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Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate
A.A. Savelyeva 1,2, E.S. Kozlova 1,2

IPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS,
443001, Samara, Russia, Molodogvardeyskaya 151,
Samara National Research University, 443086, Samara, Russia, Moskovskoye Shosse 34

 PDF, 1427 kB

DOI: 10.18287/2412-6179-CO-934

Pages: 531-536.

Full text of article: Russian language.

Using a finite-difference time-domain method, it has been shown that focal spots generated when tightly focusing a linearly polarized Gaussian beam by a Fresnel zone plate (FZP) and when focusing a Gaussian beam with an embedded optical vortex by a spiral zone plate (SZP) have different patterns of the intensity and energy flux. The most significant differences are observed when the value of the topological charge (TC) is equal to three. The energy flux has an annular distribution when the Gaussian beam is focused by the FZP, while the SZP produces a field whose patterns of intensity and energy flux have three local maxima. The number of local maxima corresponds to the order of the SZP. At a certain distance from the focus, the petal structure of the intensity (and energy flux) changes to a ring distribution.

two-layered dielectric microcylinder, photonic nanojet, tight focusing, FDTD-method.

Savelyeva AA, Kozlova ES. Comparison of the shape of focal spots in terms of intensity and energy flux for a high-aperture zone plate and a spiral zone plate. Computer Optics 2022; 46(4): 531-536. DOI: 10.18287/2412-6179-CO-934.

The authors are grateful to V.V. Kotlyar for discussing the results of this study. The work was partly funded the Russian Science Foundation grant #18-19-00595 (Sections “Simulation” and “Discussion”), and the RF Ministry of Science and Higher Education within a state contract with the "Crystallography and Photonics" Research Center of the RAS (Section “Formulation of the problem”).


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