Direct calculation of permeability and permittivity for a left-handed metamaterial
TL;DR: In this article, an electromagnetic metamaterial was fabricated and demonstrated to exhibit a "left-handed" (LH) propagation band at microwave frequencies, a situation never observed in naturally occurring materials or composites.
Abstract: Recently, an electromagnetic metamaterial was fabricated and demonstrated to exhibit a “left-handed” (LH) propagation band at microwave frequencies. A LH metamaterial is one characterized by material constants—the permeability and permittivity—which are simultaneously negative, a situation never observed in naturally occurring materials or composites. While the presence of the propagation band was shown to be an inherent demonstration of left handedness, actual numerical values for the material constants were not obtained. In the present work, using appropriate averages to define the macroscopic fields, we extract quantitative values for the effective permeability and permittivity from finite-difference simulations using three different approaches.
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TL;DR: The state-of-the-art of electromagnetic metasurfaces and emergent applications in advanced integrated devices and instruments from the design method to physical implementation are reviewed in this article .
Abstract: This paper reviews the-state-of-the-art of electromagnetic (EM) metasurfaces and emergent applications in advanced integrated devices and instruments from the design method to physical implementation. The design method includes the analytical coupled mode theory model and commonly used building blocks to construct functional metasurfaces. The modeling approach creates a common design basis of metasurface devices for optical beam steering, focusing, modulation, lasing, and detection. The proof of concept of metasurfaces has been established and is translating to practical applications. Previous studies demonstrated promising applications of metasurfaces including but not limited to optical imaging instruments, biochemical sensing devices, and multifunctional microoptoelectromechanical systems (MOEMS). Significant performance improvement of devices and instruments has been achieved due to the implementation of specially tailored metasurfaces. This review provides an alternative for researchers to step forward on the way of advancing devices and instruments by the deployment of metasurfaces.
7 citations
01 Jan 2022
TL;DR: In this paper, a square-shaped unit cell with two loops is analyzed by placing on the FR4 substrate and a step-by-step procedure is done to optimize the unit cell which is suitable to extract the metamaterial properties are proposed.
Abstract: Unit cells are the building blocks for creating the metamaterial periodic surface. Generally, the metamaterial unit cell exhibits the negative value of permittivity and permeability. Determination of metamaterial scattering parameters is the important step involved in the design of periodic structures. Here, a square-shaped unit cell having two loops is analyzed by placing on the FR4 substrate. The overall dimension of the substrate is 7 mm × 7 mm × 0.25 mm. Step-by-step procedure is done to optimize the unit cell which is suitable to extract the metamaterial properties are proposed. Unit cell is simulated using high-frequency structured simulator (HFSS) version HFSS 2020 R2, and the results are exported for the parameter retrieval. Scattering parameter retrieval method is used to analyze the unit cell with proper dimension and boundaries. Permittivity and permeability of the double-loop unit cell with and without split rings were determined using MATLAB R2020a program from the exported data of the simulations done. Extracted parameters of all the different combinations are compared and the metamaterial properties are determined for each unit cells.
7 citations
Dissertation•
01 Jan 2007
TL;DR: In this paper, Erdinc Irci and Vakur B. Erturk investigated wave propagation in metamaterial structures and derived the transparency and resonance conditions for PEC core cylinder case under the subwavelength limitations.
Abstract: WAVE PROPAGATION IN METAMATERIAL STRUCTURES AND RETRIEVAL OF HOMOGENIZATION PARAMETERS Erdinc Irci M.S. in Electrical and Electronics Engineering Supervisor: Assist. Prof. Dr. Vakur B. Erturk August 2007 Electromagnetic wave propagation in metamaterial structures (metamaterial slabs, metamaterial cylinders, metamaterial coated conducting cylinders etc.) are investigated. Scattered and transmitted electromagnetic fields by these structures due to electric line sources or plane wave illuminations are found. A generic formulation of these wave propagation problems is done, enabling any kind of metamaterial or conventional material to be used, having any sign combination of constitutive parameters and having any electric and/or magnetic losses. For one of these propagation problems i.e., metamaterial coated conducting cylinders illuminated normally with plane waves, achieving transparency and maximizing scattering are investigated thoroughly. It is found out that, rigorous derivation of transparency and resonance (scattering maximization) conditions for PEC core cylinder case under the sub-wavelength limitations yields the same conditions of two electrically small concentric layers of conjugately paired cylinders, given in the literature (when the inner core layer is also taken to the PEC limit). These transparency and resonance conditions are found to be heavily
7 citations
01 Sep 2007
TL;DR: In this article, the authors take a critical look at the problem of performance enhancement of small antennas using metamaterials and introduce their own classification of artificial dielectrics in the microwave regime by dividing them into two broad subcategories.
Abstract: In this review paper we take a critical look at the problem of performance enhancement of small antennas using metamaterials We first review the definitions of metamaterials that have been used in the literature, and then introduce our own classification of metamaterials in the microwave regime - that are artificial dielectrics - by dividing them into two broad sub-categories Representative examples of antenna / metamaterial composites are presented and the paper concludes some thoughts on future directions of Metamaterial Research, focusing on the aspect of performance enhancement of small antennas
7 citations
Dissertation•
01 Jan 2012
TL;DR: In this paper, Özet et al. present a table of acknowledgements for Özt and Özturk's book, "Acknowledgements: Acknowledgements in Turkish Literature".
Abstract: ............................................................................................................. iii Özet .................................................................................................................. v Acknowledgements .......................................................................................... vii Table of
6 citations
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10,495 citations
TL;DR: In this paper, it was shown that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu/sub eff/, which can be tuned to values not accessible in naturally occurring materials.
Abstract: We show that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu//sub eff/, which can be tuned to values not accessible in naturally occurring materials, including large imaginary components of /spl mu//sub eff/. The microstructure is on a scale much less than the wavelength of radiation, is not resolved by incident microwaves, and uses a very low density of metal so that structures can be extremely lightweight. Most of the structures are resonant due to internal capacitance and inductance, and resonant enhancement combined with compression of electrical energy into a very small volume greatly enhances the energy density at critical locations in the structure, easily by factors of a million and possibly by much more. Weakly nonlinear materials placed at these critical locations will show greatly enhanced effects raising the possibility of manufacturing active structures whose properties can be switched at will between many states.
8,135 citations
TL;DR: A composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability and permittivity varepsilon(eff)(omega).
Abstract: We demonstrate a composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with
8,057 citations
TL;DR: In this article, an effective description for a metalodielectric photonic bandgap (PBG) material was developed for a semi-infinite and slab observables.
Abstract: An effective description is developed for a metalodielectric photonic bandgap (PBG) material far beyond the quasi-static limit of traditional effective-medium theories. An analytic approach, recently presented by the authors, is further advanced to provide the complete effective permittivity and permeability functions. Reflection and transmission coefficients are presented for both TM and TE oblique plane-wave incidence, based on the determination of the equivalent impedance for each lattice plane in the crystal and the transfer-matrix method for reconstructing the effect of successive lattice planes. An analysis of the semi-infinite and slab observables yields the anisotropic effective refractive index, effective permittivity, and effective permeability, thus completing the macroscopic description of the interaction of electromagnetic waves with the medium. Among the novel aspects of the analysis is the equivalence of our PBG system with a physically dispersive system at ultraviolet frequencies and the derivation and explanation of the development of high dispersive magnetization (permeability) for these media, independently of the microscopic magnetic properties of the metallic implants.
44 citations