&lt;title&gt;Applicability of ferrimagnetic hosts to nanostructured negative index of refraction (left-handed) materials&lt;/title&gt;

Dewar, G.

doi:10.1117/12.472980

Cited by 11 publications

(17 citation statements)

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“…If the magnetic host were to be in intimate contact with the wires, the negative self inductance of the wires arising from the negative permeability of the surrounding ferrite would cause the current response of the wires to be nearly in phase with the electric field incident on the wires. This would result in a positive permittivity [7,11] and destruction of the plasmon. The nonmagnetic cladding decouples the wires from the magnetic host sufficiently to restore the negative permittivity of the wire array [7,8].…”

Section: Scattering At One Wirementioning

confidence: 97%

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Strategies for minimizing losses in negative phase velocity metamaterials

Dewar

2006

SPIE Proceedings

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Metamaterials demonstrating a negative phase velocity for light usually consist of arrays of wires and cut-ring structures. Such media are characterized by both the permittivity and permeability being negative. Calculations of the Ohmic loss associated with the wires alone indicate that dissipation can be minimized by making them of metal of the highest possible conductivity and by having the largest possible wire radius. Replacement of the cut-ring structures with a ferrite further reduces losses since ferrites can be less lossy than typical conductors. The upper limit to the wire radius is ultimately set by the requirement that the permittivity be negative. The calculations take into account the skin depth within the wires. Although bigger wires lead to more volume in which Ohmic losses are present, these wires are more effective in shorting out the electric field and thereby decreasing the Ohmic loss. An array made of large diameter and high conductivity wires leads to a strong electromagnetic response and a well defined plasma frequency for the wire array.

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Section: Scattering At One Wirementioning

confidence: 97%

“…Some experimental data for magnetic media providing the necessary negative permeability for an NPV material exist [6]. In order that the ferrite not destroy the negative permittivity of the wire array, the wires must be cladded in a nonmagnetic dielectric [7,8]. Figure 1 from [8] illustrates this type of structure.…”

Section: Introductionmentioning

confidence: 98%

Strategies for minimizing losses in negative phase velocity metamaterials

Dewar

2006

SPIE Proceedings

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“…Such structures have been reported by Tsutsumi and Okubo [14,15] using a microstrip line built on a longitudinally or normally magnetized ferrite substrate and periodically loaded with inductive stubs. Dewar has proposed a left-handed metamaterial by implementing an array of metallic wires inside a ferrite substrate [16]. For decoupling the electric and magnetic response, a cladding dielectric is used to isolate the individual wires from the ferrite in Dewar's LH unit cell.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a novel tunable Ferrite based left handed strip line

Ghalibafan¹,

Komjani²,

Rejaei³

2012

Journal of Electromagnetic Waves and Applications

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This paper proposes, for the first time, a tunable left handed transmission line consisting of a strip line sandwiched between a ferrite superstrate and a dielectric substrate containing a metallic wire array. The left-handed behavior is realized by combining the negative permittivity of the wire array with the negative permeability of the longitudinally magnetized ferrite substrate despite them being spatially separated. Theoretical and numerical results demonstrate the tunability of the left-handed frequency band by changing the DC bias magnetic field applied to the ferrite. Compared to other tunable lefthanded structures, the fabrication requirements on this structure are not critical, which enhances its potential applicability.

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“…The proposed waveguide model is shown in Figure 2(a), and the total number of mesh elements is 117 ∼ 781. Dewar indicates that the plasma oscillation is destroyed if the medium surrounding the wires has a negative permeability [15]. Accordingly it may be necessary to add layers for decoupling between metallic wires and ferrite medium.…”

Section: Parameters and Simulationmentioning

confidence: 99%

“…For giving rise to negative permeability, researchers introduce ferrite medium to replace SRR structure. Chui and Hu investigated the possibility of preparing LHM in metallic magnetic granular composites [14], and Dewar replaced the array of SRRs with a nonconducting ferrimagnet to extend operating frequency into the far infrared and make LHM smaller with low losses [15] in 2002. Ferrite medium has nonreciprocal and tunable characteristics depending on the applied dc magnetic field and can be a medium with negative permeability and show gyrotropic characteristics [16].…”

Section: Introductionmentioning

confidence: 99%

Modeling of a Ku-Band Rectangular Ferrite-Loaded Waveguide Based on Left-Handed Metamaterial

Yang¹,

Li²,

Gan³

et al. 2016

PIER M

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Abstract-This paper presents the modeling and simulation of a new rectangular ferrite-loaded waveguide based on left-handed metamaterial (LHM) unit cells at K u -band. The structure has an 8 × 8 unit cell configuration, whose negative permittivity and negative permeability are achieved by metallic wires array and ferrite medium, respectively. The equivalent circuit model and transmission parameter matrix for the unit cell are presented based on microwave two-port network theory. The operating frequency is in the TE 10 single mode range at 12.97-15.90 GHz where magnetic and electric resonances are coupled simultaneously. The finite-element method (FEM) based simulation software HFSS has been used to set original model and optimized model with vacuum layers for decoupling. Analysis of 3D electromagnetic waves propagation and scattering parameters demonstrate the backward wave property of the optimized waveguide. Negative propagation constant and negative index of refraction are calculated based on a method for extracting effective parameters of LHM. The proposed structure has scalability, double negative, and broad-band operation characteristics in the electromagnetic paradigm.

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<title>Applicability of ferrimagnetic hosts to nanostructured negative index of refraction (left-handed) materials</title>

Cited by 11 publications

References 0 publications

Strategies for minimizing losses in negative phase velocity metamaterials

Strategies for minimizing losses in negative phase velocity metamaterials

Design and analysis of a novel tunable Ferrite based left handed strip line

Modeling of a Ku-Band Rectangular Ferrite-Loaded Waveguide Based on Left-Handed Metamaterial

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