Wire metamaterial: Enhancement of evanescent waves and application for improvement of magnetic resonance imaging

Slobozhanyuk, Alexey P.; Melchakova, Irina V.; Kozachenko, A. V.; Simovski, Constantin; Belov, Pavel A.

doi:10.1109/metamaterials.2013.6809108

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2015

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“…Recently, nearfield imaging devices have also been exploiting surface waves with flat dispersion diagrams for high resolution near-field images [5], [6]. In [6], the magnetic field distribution along wires is observed to be resonating. In [5], the zero of the reflection coefficient of a loaded slot is considered as the reason for improved imaging capabilities.…”

Section: Introductionmentioning

confidence: 99%

Using metamaterial resonators for controlling surface wave modes in an open waveguide

Tooni

Vietzorreck

Eibert

2015

2015 German Microwave Conference

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Based on the properties of surface wave modes in dielectric slab waveguides, it is shown that the cutoff frequencies of the surface wave modes can be obtained from the zeroes of the reflection coefficient at wavenumbers close to the light line. Afterwards, a surface wave periodic structure is analyzed by the method of excitation of eigenmodes. By considering the field distribution of the surface wave modes of the open waveguide structure, the unit cells are loaded by appropriate metamaterial resonators. The metamaterial resonators introduce a new surface wave mode propagating at frequencies below their resonant frequency while the eigenmodes of the guided structure are not strongly affected. This method can be employed to obtain an arbitrary frequency band for near-field imaging applications.

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