Work

Features of focusing of optical vortices using subwavelength elements with varying height of odd and even relief zones

Year: 2024

Type: article

Abstract: In this work, the propagation of optical vortices with circular, radial, and azimuthal polarization through subwavelength ring gratings with standard and GRIN substrates using a finite difference time domain method is numerically simulated. It is shown that it is possible to select the polarization of laser radiation and parameters of the element in such a way that a long optical needle (up to 8.04λ, radial polarization), a tight focal spot (up to 0.4λ in diameter, circular polarization), single optical traps, and combinations thereof are generated on the optical axis.

Source: Computer Optics

DOI: 10.18287/2412-6179-co-1531

Author: D.A. Savelyev

Institutions: Kurchatov Institute, Samara National Research University, Image Processing Systems Institute

Language: English

Topic: Orbital Angular Momentum in Optics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funder: Russian Science Foundation

Award: G2028046204