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Features of a Gaussian beam near-field diffraction upon variations in the relief height of subwavelength silicon optical elements
D.A. Savelyev 1,2

1 Samara National Research University,
443086, Samara, Russia, Moskovskoye Shosse 34;
2 IPSI RAS – Branch of the FSRC “Crystallography and Photonics” RAS,
443001, Samara, Russia, Molodogvardeyskaya 151

 PDF, 3106 kB

DOI: 10.18287/2412-6179-CO-1402

Pages: 938-947.

Full text of article: Russian language.

Abstract:
Features of the near-field diffraction of Gaussian beams and Laguerre-Gauss modes by silicon subwavelength optical elements with varying relief height were studied in this paper using a finite-difference time-domain method. Diffractive axicons and subwavelength ring gratings were considered as the optical elements with varying relief height. It was shown that the height of individual rings of the ring grating relief can be selected in such a way that the focal spot size is reduced to 0.26λ, an extended intensity line of length up to 4.88λ is generated and optical traps are formed.

Keywords:
Gaussian beams, optical vortices, silicon ring gratings, diffractive axicon, sharp focusing, optical trap, FDTD.

Citation:
Savelyev DA. Features of a Gaussian beam near-field diffraction upon variations in the relief height of subwavelength silicon optical elements. Computer Optics 2023; 47(6): 938-947. DOI: 10.18287/2412-6179-CO-1402.

Acknowledgements:
This work was partly funded by the RF Ministry of Science and Higher Education within the government project under grant No. FSSS-2023-0006 (Sections "Introduction", "Incident beams and analyzed 3D elements", and "Investigation of the diffraction of laser beams by diffractive axicons"), with the rest part of the work funded from the program of strategic academic leadership "Priority 2030".

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