A new planar left-handed metamaterial composed of metal-dielectric-metal structure (original) (raw)
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physica status solidi (b), 2007
A planar composite metamaterial consisting of bilayers of metal cutwire pairs and long wire pairs which are separated by a thin dielectric layer is designed and fabricated for microwave frequencies. The simulated and experimentally measured transmission spectra of the metamaterial and its individual components (cutwire-only and wire-only) indicates that the metamaterial exhibits a transmission band within the common stop bands of its components, and thus acts as a medium with negative index of refraction. The existence of n < 0 is further supported by a refraction experiment.
A new 2D isotropic left-handed metamaterial design: Theory and experiment
Microwave and Optical Technology Letters, 2002
A novel design for 2D isotropic left-handed metamaterials is presented. One of the main advantages of our proposal is that all the metallizations are placed at parallel stratified planes. Thus, this design can be realized by means of the well known, commonly used planar technology. An analytical model is provided for the analysis of this new metamaterial. Numerical results obtained by using this model are validated by experimental simulations. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 405–408, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10620
Experimental investigation of reflection characteristics of left-handed metamaterials in free space
2007
Abstract The transmission and reflection characteristics are presented of a one-dimensional (1D) left-handed metamaterial (LHM) and its constituents, split ring resonator and thin wire arrays. A well-defined left-handed transmission band with a peak value of-7.2 dB is obtained at frequencies where effective permittivity and permeability are both negative. A sharp dip (-34.5 dB) at the reflection spectrum of 1D ordered LHM is observed.
Uniplanar left-handed artificial metamaterials
Journal of Optics A: Pure and Applied Optics, 2005
Planar periodic arrays of metallic elements printed on grounded dielectric substrates are presented to exhibit left-handed properties for surface wave propagation. The proposed structures dispense with the need for grounding vias and ease the implementation of uniplanar left-handed metamaterials at higher frequencies. A transmission line description is used for the initial design and interpretation of the left-handed property. A thorough study based on full wave simulations is carried out with regards to the effect of the element geometrical characteristics and the array periodicity to the properties of the artificial material. Dispersion curves are presented and studied. The distribution of the modal fields in the unit cell is also studied in order to provide an explanation of the material properties. The scalability of the proposed structures to infrared frequencies is demonstrated.
Left-handed metamaterials: detailed numerical studies of the transmission properties
Journal of Optics A: Pure and Applied Optics, 2005
Using numerical simulation techniques such as the transfer matrix method and the commercially available code Microwave Studio, we study the transmission properties of left-handed (LH) metamaterials and arrays of split-ring resonators (SRRs). We examine the dependence of the transmission through single-and double-ring SRRs on parameters of the system such as the size and shape of the SRRs, size of the unit cell, dielectric properties of the embedding medium where the SRRs reside, and SRR orientation relative to the incoming electromagnetic field. Moreover, we discuss the role of SRRs and wires on the electric cut-off frequency of the combined system of wires and SRRs, as well as the influence of the various system parameters on the LH transmission peak of a medium composed of SRRs and wires. Finally, demonstrating the disadvantages of the currently used SRR designs due to the lack of symmetry, we discuss more symmetric, multigap SRRs, which constitute very promising components for future two-dimensional and three-dimensional LH structures.
Characterization and electromagnetic response of a ϕ-shaped metamaterial
The European Physical Journal B, 2011
In this paper we experimentally and numerically study the left-handed behavior in a biplanar metamaterial operating at microwave frequency. The metamaterial consists of φ-shaped metallic patterns on both sides of a dielectric spacer. The origin of negative refractive index is elucidated by performing the effective medium analysis. Additionally, the dependence of the left-handed transmission on geometric parameters, such as the periodicities, the shapes of metallic slabs and continuous wires, and the impact of spacer separation, is examined.
The electromagnetic response of different metamaterial structures
Advances in Natural Sciences: Nanoscience and Nanotechnology, 2010
This report investigates systematically the effect of structural parameters on the left-handed behavior of a combined structure. The combined structure consists of a 'cut-wire pair', providing a negative magnetic permeability µ < 0, and a 'continuous wire', yielding a negative electric permittivity ε < 0. The left-handed metamaterials were designed, fabricated and measured in the microwave-frequency regime. It was found that the width of the continuous wire as well as the distance between the substructures play an important role in determining whether negative refractive properties (in other words, left-handed behavior) are obtained or not. Additionally, we studied the influence of the lattice constant on the electromagnetic response of the combined structure. The actual measurements are compared with numerical simulation values to show good coincidence. Finally, we designed and simulated an electromagnetic absorber made of metamaterials. It is expected that this work will allow us to optimize appropriate characteristic parameters even without avoiding trial and error fabrications.