Multiple Pass‐Band Optical Left‐Handed Metamaterials Based on Random Dendritic Cells

Liu, Bao-Qi; Zhao, Xiaopeng; Zhu, Weiren; Luo, Wei; Cheng, Xiaochao

doi:10.1002/adfm.200800444

Cited by 80 publications

(52 citation statements)

References 22 publications

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“…Chen et al [54] demonstrated a metamaterial with two domains of the negative refraction due to two different sizes of the resonators. Liu et al [55] and Zhao et al [56] realized a metamaterial with multiresonant left-handed behavior from a material made of silver dendritic cells. Such an approach can increase the number of frequency regimes over which useful metamaterial responses are obtained.…”

Section: Metallodielectric Compositesmentioning

confidence: 99%

How Far Are We from Making Metamaterials by Self‐Organization? The Microstructure of Highly Anisotropic Particles with an SRR‐Like Geometry

Pawlak

Turczyński

Gajc

et al. 2010

Adv Funct Materials

116

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Metamaterials offer new unusual electromagnetic properties, which have already been demonstrated, and many postulated new functionalities are yet to be realized. Currently, however, metamaterials are mostly limited by narrow band behavior, high losses, and limitation in making genuinely 3D materials. In order to overcome these problems an overlap between metamaterial concepts and materials science is necessary. Engineered self‐organization is presented as a future approach to metamaterial manufacturing. Using directional solidification of eutectics, the first experimental realization of self‐organized particles with a split‐ring resonator‐like cross section is demonstrated. This unusual morphology/microstructure of the eutectic composite has a fractal character. With the use of TEM and XRD the clear influence of the atomic crystal arrangement on the microstructure geometry is presented. The materials obtained present very high anisotropy and can be obtained in large pieces. Metallodielectric structures can be created by etching and filling the space with metal. The next steps in the development of self‐organized materials exhibiting unusual properties are discussed.

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Section: Metallodielectric Compositesmentioning

confidence: 99%

How Far Are We from Making Metamaterials by Self‐Organization? The Microstructure of Highly Anisotropic Particles with an SRR‐Like Geometry

Pawlak

Turczyński

Gajc

et al. 2010

Adv Funct Materials

116

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show abstract

“…The previous paper [4] reported that negative l 0 existed at high f for the anisotropic iron nanorods, which slightly crosslinked together, but it disappeared when the anisotropic iron nanorods were transformed into isotropic nanoparticles. The random nanostructures of silver dendritic cell could constitute left-handed metamaterials at infrared frequencies [20]. In this experiment, the obtained dendritic iron could be regarded as a micropine where many 1D nanorods paralleled to each other and were linked together with a 1D trunk, so the negative l 0 occurred.…”

Section: Microwave Electromagnetic Properties Of the Dendritic Ironmentioning

confidence: 99%

“…Owing to the peculiar structure and morphology anisotropy, the dendritic fractals exhibit different properties from the nano-/microparticles with shape isotropies and have wide applications in the fields of the design and synthesis of new nano-/microfunctional materials [12,19]. It has been predicted that dendritic fractals may have negative permittivity and permeability and are possibly used as left-handed metamaterials (LHM) [20], resulting in peculiar electromagnetic properties and excellent microwave adsorption property. Recently, dendritic FeNi 3 alloys with a single crystalline trunk or branch were reported to be synthesized in a large scale through a hydrothermal method, which was claimed to have a DLA formation mechanism, similar to that of dendritic hematite [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, magnetic and microwave electromagnetic properties of dendritic iron

Yan

Zhao

et al. 2015

Appl. Phys. A

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Iron dendritic micropines are synthesized by a hydrogen reduction, where the hematite dendritic micropines prepared by a hydrothermal method are used as starting materials. The as-obtained dendritic iron exhibits enhanced coercivity and remanent magnetization at room temperature and high complex permittivity at 2-18 GHz due to the peculiar shape anisotropy and good crystallinity. The negative imaginary permeability is observed at 14.5-18.0 GHz, suggesting it has a potential as a lefthanded material. The paraffin-based composites containing 30 wt% dendritic irons show large permittivity resulting from the charge polarization and the conductivity and have a minimal reflection loss (RL) of -37.4 dB at 7.4 GHz when the thickness (d) is 2.0 mm. The RL values less than -20 dB are obtained in the frequency range of 5.5-12.9 GHz when d increases from 0.9 to 3.0 mm.

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“…Besides, the fabrication of gradient index lens is relatively complicated, and they can only realize limited phase shifts. Recent investigations in metamaterials have opened up new avenues for manufacturing various novel devices [6][7][8][9][10][11][12][13], in which the electromagnetic metasurface as a new approach has attracted tremendous interests of researchers [14][15][16][17][18][19]. The arbitrary modulation of electromagnetic waves could be realized just via ultrathin artificial composite materials, including bending of the direction of propagating waves, abnormal transmission and reflection, and planar lenses.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of transmitted wave front using ultrathin planar acoustic metasurfaces

et al. 2015

Self Cite

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Nowadays, the acoustic devices are developing toward miniaturization. However, conventional materials can hardly satisfy the requirements because of their large size and complex manufacturing process. The introduction of acoustic metasurfaces has broken these restrictions, as they are able to manipulate sound waves at will by utilizing ultrathin planar metamaterials. Here, a simple acoustic metasurface is designed and characterized, whose microstructure is constructed with a cavity filled with air and two elastic membranes on the ends of cavity. By appropriately optimizing the configurations of microstructures, the steering of transmitted wave trajectory is demonstrated, and some extraordinary phenomena are realized at 3.5 kHz, such as planar acoustic axicon, acoustic lens, the conversion from spherical waves to plane waves, and the transformation from propagating waves to surface waves.

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Multiple Pass‐Band Optical Left‐Handed Metamaterials Based on Random Dendritic Cells

Cited by 80 publications

References 22 publications

How Far Are We from Making Metamaterials by Self‐Organization? The Microstructure of Highly Anisotropic Particles with an SRR‐Like Geometry

How Far Are We from Making Metamaterials by Self‐Organization? The Microstructure of Highly Anisotropic Particles with an SRR‐Like Geometry

Synthesis, magnetic and microwave electromagnetic properties of dendritic iron

Manipulation of transmitted wave front using ultrathin planar acoustic metasurfaces

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