Negative permeability of magnetic nanocomposite films for designing left-handed metamaterials

2007 ◽  
Vol 91 (22) ◽  
pp. 223104 ◽  
Author(s):  
Chiharu Mitsumata ◽  
Satoshi Tomita
Keyword(s):  
Magnetic Nanocomposite ◽  
Nanocomposite Films ◽  
Negative Permeability ◽  
Left Handed

scholarly journals Role of bianisotropy in negative permeability and left-handed metamaterials

2002 ◽  
Vol 65 (14) ◽  
Author(s):  
Ricardo Marqués ◽  
Francisco Medina ◽  
Rachid Rafii-El-Idrissi
Keyword(s):  
Negative Permeability ◽  
Left Handed

scholarly journals A Novel Tunable Triple-Band Left-Handed Metamaterial

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Si Li ◽  
Atef Z. Elsherbeni ◽  
Wenhua Yu ◽  
Wenxing Li ◽  
Yunlong Mao
Keyword(s):  
Current Density ◽  
Surface Current ◽  
Wide Band ◽  
The Other ◽  
Negative Permittivity ◽  
Negative Permeability ◽  
Surface Current Density ◽  
Density Distributions ◽  
Left Handed ◽  
Triple Band

A novel tunable triple-band left-handed metamaterial (LHM) composed of a single-loop resonator (SLR) and a variable capacitor-loaded short wire pair (CL-SWP) printed on both sides of a substrate is presented in this paper. The CL-SWP-based metamaterial (MTM) is a novel single-sided LHM. It is theoretically analyzed capable of extracting tunable negative permeability and a wide-band negative permittivity. We ran simulations for the CL-SWP-based MTM, the SLR-based MTM, and the proposed LHM. Together with the measured results, it is identified that this novel LHM exhibits a tunable triple-band left-handed (LH) property. With the increase of the loaded capacitance, one LH band is relatively stable, while the other two are moving towards lower frequencies with their bandwidth getting wider and narrower, respectively. The surface current density distributions indicate that the first LH band is mainly decided by the SLR, one of the rest 2 LH bands is mainly decided by the CL-SWP, and the other one is decided by the SLR and CL-SWP together.

POSSIBLE EXISTENCE OF GRANULAR LEFT-HANDED MATERIALS BASED ON BRUGGEMAN FORMALISM

2010 ◽  
Vol 24 (27) ◽  
pp. 5469-5474
Author(s):  
WEIKAI XU ◽  
YANZHANG DONG ◽  
SHUTIAN LIU
Keyword(s):  
Negative Permittivity ◽  
Negative Permeability ◽  
Left Handed ◽  
Two Component ◽  
Current Stage

In the current stage, left-handed material (LHM) has aroused wide interest based on several basic prototypes such as metamaterials. In this work, we have theoretically investigated the possible existence of granular LHM by using the Bruggeman formalism. The Wiener bounds and the Hashin–Shtrikman bounds were invoked and some examples were represented. We had found that when the dissipations are increased adequately, the estimates of the Bruggeman formalism will lie within the two bounds rigorously, even if the two permittivities have real parts of opposite signs. Thus, one particulate LHM may be achieved by choosing the two component mediums with negative permittivity and negative permeability, respectively.

Preparation and Characterization of Fe3O4/Poly (2-Hydroxyethyl Methacrylate) Magnetic Nanocomposite Films

2008 ◽  
Vol 396-398 ◽  
pp. 465-468
Author(s):  
Wei Wang ◽  
Zhen Li ◽  
Li Li
Keyword(s):  
Blood Compatibility ◽  
Magnetic Nanocomposite ◽  
Nanocomposite Films ◽  
Hydroxyethyl Methacrylate ◽  
Vibrating Sample Magnetometer ◽  
Equilibrium Swelling ◽  
Ft Ir ◽  
Biomedical Field ◽  
Equilibrium Swelling Ratio

Magnetic nanocomposite films of the Fe3O4/pHEMA were prepared by dispersing the Fe3O4 nanoparticles into the HEMA monomer before they were polymerized. The resultant nanocomposite films were characterized by Fourier transform infrared (FT-IR) and the vibrating sample magnetometer (VSM). The swelling behavies and the hemolytic ratios of the filmes were also investigated in this work.The equilibrium swelling ratio decreased with the increase of the amount of nanoparticles. The nanocomposite films had a clear superparamagnetic behavior because of the addition of nanoparticles. The hemolytic ratios were all lower than 5%, which indicated that the nanocomposites films had the good blood compatibility and can be used in the biomedical field

Double Negative Optical Metamaterial with All-Dielectric Fishnet Structure

2013 ◽  
Vol 873 ◽  
pp. 813-818 ◽  
Author(s):  
Chu Wen Lan ◽  
Xiao Jian Fu ◽  
Xiao Ming Liu ◽  
Bo Li ◽  
Ji Zhou
Keyword(s):  
High Performance ◽  
Figure Of Merit ◽  
Negative Refraction ◽  
Wide Band ◽  
Negative Permeability ◽  
Double Negative ◽  
Negative Index ◽  
Left Handed ◽  
Silicon Based ◽  
Multilayer Dielectric

An all-dielectric fishnet metamaterial (DFM) composed of multilayer dielectric structure with periodically patterned holes is proposed to generate left-handed behavior in optical frequency region. Different from the metallic fishnet negative index metamaterial realized by coupling the neighbouring functional layers along the propagation direction, this DFM owes its simultaneous negative permeability and permittivity to the hybrid coupled resonances in the same layer. Based on this configration, a wide-band and polarization-independent negative refraction with maximum figure of merit as large as 13.85 is obtained by a silicon-based DFM at 450 nm wavelength. Simple and easy to fabricate, this concept is believed to provide an alternative route to realize high-performance negative index metamateirals at optical frequencies.

The Left-Handed Properties of the Composite Medium Composed of Ferrite Cubes’ Array and Copper Net

2010 ◽  
Vol 434-435 ◽  
pp. 343-345 ◽  
Author(s):  
Li Hui Zhang ◽  
Yang Bai ◽  
Jin Xu Li ◽  
Li Jie Qiao
Keyword(s):  
Negative Refraction ◽  
Composite Medium ◽  
Negative Permittivity ◽  
Electromagnetic Properties ◽  
Pass Band ◽  
Negative Permeability ◽  
Wave Amplification ◽  
Left Handed ◽  
Negative Role ◽  
Difference Time

Left-handed material (LHM), whose permittivity and permeability are both negative, has attracted much attention due to its exotic electromagnetic properties, such as negative refraction, backward wave propagation and evanescent wave amplification. The microwave left-handed property of a composite medium composed of ferrite cubes’ array and copper net was studied using the method of finite difference time domain in this paper. An obvious left-handed pass band emerged when ferrite cubes were combined with longitudinal copper wires, because the ferrite produced negative permeability by the ferromagnetic resonance and the copper wires produced negative permittivity by the plasma. With the addition of horizontal copper wires, the transmission intensity of the pass band was gradually weakened. It can be concluded that the horizontal wires played a negative role in realizing the composite LHM with ferrite cubes and copper net. This work gives an instructive direction to the fabrication of 3D LHMs.

scholarly journals The thick ring resonators to achieve negative permeability and its left-handed behavior in perpendicular propagation

2008 ◽  
Vol 57 (2) ◽  
pp. 934
Author(s):  
Liu Ya-Hong ◽  
Song Juan ◽  
Luo Chun-Rong ◽  
Fu Quan-Hong ◽  
Zhao Xiao-Peng
Keyword(s):  
Ring Resonators ◽  
Negative Permeability ◽  
Left Handed

scholarly journals Wideband Negative Permittivity and Double Negative Fishnet-Mushroom-Like Metamaterial in X-Band Waveguide

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Ahmed Mahmood ◽  
Golge Ogucu Yetkin ◽  
Cumali Sabah
Keyword(s):  
Dielectric Substrate ◽  
Negative Permittivity ◽  
Negative Permeability ◽  
Double Negative ◽  
Characteristic Parameters ◽  
Electromagnetic Band Gap ◽  
Left Handed ◽  
X Band ◽  
Metallic Parts ◽  
Good Agreement

A Fishnet-Mushroom-like metamaterial electromagnetic behaviour is represented in S-parameters numerically and experimentally for X-band frequencies arena. The design has introduced a dielectric substrate as a host with metallic parts. The proposed design is predicted to provide the electromagnetic band gap characterization with desired reiterative characteristic parameters, negative permittivity, and negative permeability exhibiting a double negative left-handed region, which is identified with the X-band regime with good agreement between the simulated and the measured results.

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