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Near-field enhanced imaging by a magnetized ferrite slab

 

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Opened Access Near-field enhanced imaging by a magnetized ferrite slab
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Author: Marqués Sillero, Ricardo
Mesa Ledesma, Francisco Luis
Medina Mena, Francisco
Department: Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Universidad de Sevilla. Departamento de Física Aplicada I
Date: 2005
Published in: Applied Physics Letters, 86 (2), 023505-1-023505-3.
Document type: Article
Abstract: This letter demonstrates the near-field imaging enhancement at microwave frequencies of two-dimensional sources by a ferrite slab magnetized to saturation. It is shown that this effect is based on the nonreciprocal amplification of magnetostatic surface waves (MSSW) across the ferrite slab. The inclusion of losses in our analysis has also made it possible to prove this effect for realistic yttrium iron garnet ferrite samples. For ferrite slabs of width d, the resolution at the image plane (at a distance 2d from the source) is better than the resolution in air at a distance d of the source, which leads to an equivalent air length of the ferrite slab less than zero. Since the constitutive parameters of saturated ferrites depend on the external magnetizing field, the operation frequency of the proposed imaging devices can be tuned by varying this biasing field.
Cite: Marqués Sillero, R., Mesa Ledesma, F.L. y Medina Mena, F. (2005). Near-field enhanced imaging by a magnetized ferrite slab. Applied Physics Letters, 86 (2), 023505-1-023505-3.
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URI: https://hdl.handle.net/11441/75781

DOI: 10.1063/1.1852091

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