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Generation of sub-wavelength longitudinal magnetization needle and multiple longitudinal spots using circularly polarized beam through an annular walsh function filter

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Publicado en:Journal of Optics vol. 53, no. 3 (Jul 2024), p. 2192
Autor principal: Thiruarul, D.
Otros Autores: Charles, J. William, Lavanya, M., Rajesh, K. B., Jaroszewicz, Z.
Publicado:
Springer Nature B.V.
Materias:
Walsh function
Faraday effect
Magnetic recording
Multilayers
Diffraction theory
Circular polarization
Magnetization
Magnetic fields
Electric fields
Magnetic resonance
Focal plane
Magnetic storage
Gaussian beams (optics)
Acceso en línea:Citation/Abstract
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Resumen:This numerical work demonstrates the possibility of generating sub wavelength scale magnetization spot of long focal depth and axially separated multiple magnetization segments using annular Walsh function filter. Numerical result calculated on the basis of vector diffraction theory (VDT) and Inverse Faraday Effect (IFE)  shows upon suitably choosing the parameters of Walsh function filter such as order and annular obstruction, one can generate and tune the longitudinal magnetization needle and multiple magnetization spots in the focal plane for the input circularly polarized Bessel Gaussian beam. The generated sub wavelength magnetization structures are highly applicable in fields such as all-optical magnetic recording, multiple trapping and transportation of magnetic particles, magnetic resonance microscopy and multilayer ultra-high-density magnetic storage.
ISSN:0972-8821
0974-6900
DOI:10.1007/s12596-023-01428-y
Fuente:Advanced Technologies & Aerospace Database