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Applied Physics Letters / Volume 98 / Issue 13 / DEVICE PHYSICS

Appl. Phys. Lett. 98, 133508 (2011); http://dx.doi.org/10.1063/1.3574916 (3 pages)

Nonlinear split-ring metamaterial slabs for magnetic resonance imaging

Marcos A. Lopez1, Manuel J. Freire1, Jose M. Algarin1, Volker C. Behr2, Peter M. Jakob2, and Ricardo Marqués1

1Department of Electronics and Electromagnetism, Faculty of Physics, University of Seville, Avda. Reina Mercedes s/n, 41012 Sevilla, Spain
2Department of Experimental Physics 5 (Biophysics), Institute of Physics, University of Würzburg, Am Hubland, 97074 Würzburg, Germany

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(Received 20 February 2011; accepted 17 March 2011; published online 1 April 2011)

This work analyzes the ability of split-ring metamaterial slabs with zero/high permeability to reject/confine the radiofrequency magnetic field in magnetic resonance imaging systems. Split-ring slabs are designed and fabricated to work in a 1.5 T system. Nonlinear elements consisting of pairs of crossed diodes are inserted in the split-rings, so that the slab permeability can be switched between a value close to unity when interacting with the strong field of the transmitting coil, and zero or high values when interacting with the weak field produced by protons in tissue. Experiments are shown where these slabs locally increase the signal-to-noise-ratio.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

magnetic permeability, magnetic resonance imaging, metamaterials, slabs

PACS

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 42.70.Nq

    Other nonlinear optical materials; photorefractive and semiconductor materials

  • 07.57.Pt

    Submillimeter wave, microwave and radiowave spectrometers; magnetic resonance spectrometers, auxiliary equipment, and techniques

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3574916

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    M. J. Freire, R. Marques, and L. Jelinek, Appl. Phys. Lett. 93, 231108 (2008)APPLAB000093000023231108000001.

    J. M. Algarin, M. J. Freire, M. A. Lopez, M. Lapine, P. M. Jakob, V. C. Behr, and R. Marques, Appl. Phys. Lett. 98, 014105 (2011)APPLAB000098000001014105000001.

    J. D. Baena, L. Jelinek, R. Marques, and M. G. Silveirinha, Phys. Rev. A 78, 013842 (2008).


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