H-shaped structure of left-handed metamaterials with simultaneous negative permittivity and permeability
20 Oct 2007-Acta Physica Sinica (Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences)-Vol. 56, Iss: 10, pp 5883-5889
TL;DR: In this article, a structure made of periodic arrays of H-shaped metallic pattern was introduced for building left-handed metamaterials with simultaneous negative permittivity and permeability.
Abstract: We introduce a structure made of periodic arrays of H-shaped metallic pattern that offers a potentially simple approach in building left-handed metamaterials with simultaneous negative permittivity and permeability. We have investigated experimentally the transmittance in the rectangle waveguide and found unambiguously a passband that can be tuned easily at microwave frequencies by changing the parameter t . Using phase shift experiment, prism refraction experiment and S-parameter retrieval method, we have confirmed that the H-shaped metamaterials have negative refractive indices, negative permittivity and negative permeability at the passband frequencies. Compared with the conventional left-handed metamaterials consisting of arrays of wires and split ring resonators, H-shaped left-handed metamaterials show not only magnetic resonance but also electric resonance, so they will be a good candidate in the microwave applications due to their simple structure and easy preparation.
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TL;DR: In this article, a double-incidence and multi-band left-handed metamaterial (LHM) was presented based on coplanar electric and magnetic resonators, whose structure is composed of two orthogonal Z-shaped metallic strips on each side of the dielectric substrate respectively.
Abstract: In this paper, a novel double-incidence and multi-band left-handed metamaterial (LHM) was presented based on coplanar electric and magnetic resonators, whose structure is composed of two orthogonal Z-shaped metallic strips on each side of the dielectric substrate respectively. Both the double Z-shaped LHM for electromagnetic wave parallel and normal incidences are discussed. The structure exhibits two LH pass-bands and one right-handed pass-band when electromagnetic waves are incident parallel to the substrate, while it can achieve multiple LH pass-bands under normal incidence with the same structure and only single size of Z-shaped strips. By means of theoretical analysis, building equivalent magnetic resonance circuit models, numerical simulation, extracting the effective permittivity, permeability from S parameters and the experimental measurement, the left-handed properties are analyzed and verified. The fabricated double Z-shaped metamaterials will create a new way to prepare the electromagnetic cloak which is suitable for multiple frequencies, and the cloak of infrared or visible frequency, especially with the same structure and in same size from different incident directions.
41 citations
TL;DR: In this article, the optical properties of symmetric and asymmetric H-shaped plasmonic nanoresonators were investigated, and it was shown that the large electromagnetic energy is confined in the nanogaps of Hshaped resonators due to the LC resonances.
Abstract: In this letter, we investigate the optical properties of symmetric and asymmetric H-shaped plasmonic nanoresonators that exhibit the pronounced plasmon resonances with a high quality factor. The results show that, the large electromagnetic energy is confined in the nanogaps of Hshaped resonators due to the LC resonances. By introducing the asymmetrical structure, an additional plasmon peak appears due to plasmon hybridization. Moreover, the proposed Hshaped nanoresonators reveal the huge field enhancement and figure of merit in the optical regime, which offer an excellent potential for single or double-frequency surface enhanced Raman scattering and biosensing applications.
32 citations
TL;DR: A novel negative index metamaterial microstructure design methodology that uses a FDTD solver optimized by genetic algorithm (GA) technique in order to achieve a simultaneously negative permeability and permittivity is proposed.
Abstract: In recent years, metamaterials have been the subject of research interest for many investigators worldwide. However, most of reported metamaterial microstructures are obtained based on human intuition, experience or large numbers of simulation experiments which were time-consuming, inefiective or expensive. In this paper, we propose a novel negative index metamaterial microstructure design methodology that uses a FDTD solver optimized by genetic algorithm (GA) technique in order to achieve a simultaneously negative permeability and permittivity. Firstly, an novel genetic algorithm optimization model for wide frequency band of negative refraction was proposed. Then the efiectiveness of the new technique was demonstrated by a microstructure design example that was optimized by GA. By using numerical simulations techniques and S-parameter
31 citations
TL;DR: In this paper, coplanar magnetic and electric resonators are used to construct left-handed metamaterials composed of Coplanar Magnetic Resonators and Electric Resonators.
Abstract: GHz left-handed metamaterials (LHMs) composed of coplanar magnetic and electric resonators were proposed in this paper. On each of the unit cells, the electric resonator is placed in the center space of the magnetic resonator. By adjusting the geometrical dimensions of the resonators, negative magnetic response of the magnetic resonator and negative electric response of the electric resonator can be tuned to be coexistent at the same frequencies. The effective constitutive parameters were retrieved. The results verified simultaneous negative permeability and permittivity as well as negative index of the proposed LHMs. Based on the above work, two- and three-dimensional LHMs that make use of coplanar magnetic and electric resonators were proposed. The work done in this paper is of great reference values in fabricating three-dimensional LHMs.
24 citations
TL;DR: It is maintained that the proposed implementation of the DE algorithm for NIMs optimization in the work is correct, and the mentioned ambiguities in the comment due to the existence of multiple branches for n' in the retrieval procedure have been considered and eliminated by using the proposed robust retrieval method.
Abstract: A novel negative index metamaterial design methodology for the visible spectrum with low losses was presented in this paper A robust differential evolution (DE) was employed to optimize the metamaterial design to achieve a desired set of values for the index of refraction By using numerical simulation of a wedge-shaped model and S-parameter retrieval method, we found that the DE-designed optimal solution can exhibit a low loss LH frequency band with simultaneously negative values of effective permittivity and permeability at the violet-light wavelength of 408 nm, and the figure of merit is 152, that means it may have practical applications because of its low loss and high transmission Therefore, the design methodology presented in this paper is a very convenient and efficient way to pursue a novel metamaterial with desired electromagnetic characteristics in the visible spectrum
16 citations