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ISSN: 1023-5086

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ISSN: 1023-5086

Scientific and technical

Opticheskii Zhurnal

A full-text English translation of the journal is published by Optica Publishing Group under the title “Journal of Optical Technology”

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DOI: 10.17586/1023-5086-2023-90-05-19-28

УДК: 535.42

Influence of 3D the helical microstructure shape deviations on the properties of the generated vortex beam in the near diffraction zone

Khorin P.A., Khonina, S.N.

Full text on elibrary.ru

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):
Хорин П.А., Хонина С.Н. Влияние отклонений 3D формы спиральной микроструктуры на свойства формируемого вихревого пучка в ближней зоне дифракции // Оптический журнал. 2023. Т. 90. № 5. С. 19–28. http:doi.org/10.17586/1023-5086-2023-90-05-19-28     Khorin P.A., Khonina S.N. Influence of 3D the helical microstructure shape deviations on the properties of the generated vortex beam in the near diffraction zone [in Russian] // Opticheskii Zhurnal. 2023. V. 90. № 5. P. 19–28. http:doi.org/10.17586/1023-5086-2023-90-05-19-28
For citation (Journal of Optical Technology):
Pavel A. Khorin and Svetlana N. Khonina, "Influence of 3D helical microstructure shape deviations on the properties of a vortex beam generated in the near diffraction zone," Journal of Optical Technology. 90(5), 236-241 (2023)
Abstract:

Subject of study. The effect of various deviations of the helical microstructure shape and position associated with manufacturing and alignment errors on the properties of the formed vortex beam in the near diffraction zone (at a distance of about a dozen wavelengths) has been studied. Aim of study is determination of the shape deviations different types influence and the spiral microstructure position on the formed vortex beam properties. Method. Numerical simulation is carried out using the finite-difference time-domain method of both linear and nonlinear spiral phase plate. It allows us to take into account the real features of the 3D structure of the element under study, related to reflection and refraction on a complex surface. The height of the microrelief, the radius of the illuminating beam, and its displacement vary in a number of numerical experiments. Main results. As a result of the research, it was shown that 3D shape deviations of the helical microstructure, for example, the nonlinearity of the relief, leads to a distortion of the vortex dependence of the phase and breaks the annular intensity of the formed beam. However, in this case, the overall stability of the singular beam structure is preserved, which is completely destroyed at the misalignment of the illuminating beam and the optical element. A change in the height of the microrelief leads to a change in both the topological charge and the shape of the beam. As for the influence of the aperture radius of the input Gaussian beam, by changing the aperture radius, it is possible to scale the formed vortex beams. Misalignment in the optical system leads to the loss of the annular structure of the vortex beam and its invariant properties. Practical significance. The obtained results can be useful in applying of adjustable optical elements, as well as microstructures formed in photosensitive media. The main reasons for the distortion of the formed beam structure are both technological inaccuracies during etching, including the height mismatch and changes in the structure of the zones of the diffractive optical element, and alignment errors of the optical system, including the misalignment of the illuminating beam and the optical element. It should be noted that the characteristics of the 3D the optical elements structure most noticeably affect the diffraction pattern in the near zone.

Keywords:

generalized spiral phase plate, vortex beams, near diffraction zone, microstructure, diffractive optical element

OCIS codes: 050.1970, 260.1960

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