Energy flux of a vortex field focused using a secant gradient lens

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In this paper we simulated the focusing of left circular polarized beam with a second order phase vortex and a second-order cylindrical vector beam by a gradient index Mikaelian lens. It was shown numerically, that there is an area with a negative Poynting vector projection on Z axis, that can be called an area with backward energy flow. Using a cylindrical hole in the output surface of the lens and optimizing it one can obtain a negative flow, which will be situated in the maximum intensity region, unlike to previous papers, in which such backward energy flow regions were situated in a shadow area. Thereby, this lens will work as an “optical magnet”, it will attract Rayleigh particles (with diameter about 1/20 of the wavelength) to its surface.

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Poynting vector, energy backflow, gradient index lens, cylindrical vector beam, optical vortex

Короткий адрес: https://sciup.org/140250041

IDR: 140250041   |   DOI: 10.18287/2412-6179-CO-688

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