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DOI: 10.17586/1023-5086-2025-92-05-12-25
УДК: 535.42
The optical needles formation by ring gratings of variable height with quantized substrate
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Publication in Journal of Optical Technology
Савельев Д.А. Формирование оптических игл кольцевыми решетками переменной высоты с квантованной подложкой // Оптический журнал. 2025. Т. 92. № 5. С. 12–25. http://doi.org/10.17586/1023-5086-2025-92-05-12-25
Savelyev D.A. The optical needles formation by ring gratings of variable height with quantized substrate [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 5. P. 12–25. http://doi.org/10.17586/1023-5086-2025-92-05-12-25
Dmitry A. Savelyev, "Formation of optical needles using ring gratings of variable height on a quantized substrate," Journal of Optical Technology. 92(5), 286-295 (2025). https://doi.org/10.1364/JOT.92.000286
Subject of study. Analysis of the influence of changing the relief height of subwavelength ring gratings with standard and quantized substrates on the formation of optical needles in the near diffraction zone. Aim of study. Formation of optical needles by variable-height ring gratings with a quantized substrate. Method. The finite difference time domain method was used for numerical simulation. Main results. The fea tures of optical needle formation by variable-height ring gratings with a quantized substrate in the near diffraction zone are investigated. Gaussian beams and Laguerre–Gaussian modes (0,1) with different types of polarization (circular, radial and azimuthal) were used as the input radiation. Numerical simulations have shown that a ring array, which is a combination of two axicons and supplemented with a reverse quantized substrate, is capable of generating a light
spike with a length of over 11 wave lengths for a circularly polarized Gaussian beam. The smallest focal spot size was achieved for a radially polarized Gaussian beam using a direct quantized substrate. Practical significance. The main results of the work can find their application in materials processing, nanolithography, micromanipulation of nanoparticles.
Gaussian beams, optical vortices, optical needles, subwavelength ring gratings, quantized substrate
Acknowledgements:OCIS codes: 050.1970, 050.6624
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