If both permeability and permittivity are simultaneously negative, the refrac-tive index becomes negative. 1 Introduction The periodic arrangement of subwavelength elements is known to generate unique electromagnetic (EM) properties mostly governed by the geometry rather than . Due to having multiple negative permeability frequency regions around the multiple FMR frequencies, the metamaterials consisting of . The latter is called single negative material (SNG). In 1968, Veselago flrst postulated the possibility . An engineered material with simultaneous negative electric permittivity (ε) ∗ Part of the contents of this chapter has been published in MRS Bull. Metal-based negative refractive-index materials have been extensively studied in the microwave region. Optical and acoustic metamaterials: superlens, negative refractive index and invisibility cloak Zi Jing Wong1, Yuan Wang1,2, Kevin O'Brien1, Junsuk Rho3,4, Xiaobo Yin5, Shuang Zhang6, Nicholas Fang7, Ta-Jen Yen8 and Xiang Zhang1,2 1NSF Nanoscale Science and Engineering Center, University of California, Berkeley, CA 94720, United States of America 2Materials Sciences Division, Lawrence . The theoretical properties of metamaterials were first described in the 1960s by Victor Veselago , who focused on the purely theoretical (at the time) concept of . Metamaterials with negative properties (permittivity, permeability, or both) can have many applications if such properties can be made tunable or can be switched alternatively between positive and . It is asserted that metamaterials have a brilliant future and that very important work is progressing towards the production of loss-free and active negative index and other forms of metamaterials. Mechanical behavior of matetials Metamaterials By Eng salah alhar M.Sc material science Outline • Introduction • Material choice • Installation • Application • References • Material choice :is highly dependent on the application, but typical material choices are metals such as copper, gold, silver, or aluminum, combined with plastics, air, and ceramics. A possibility to realize thermotunable isotropic negative-index metamaterials up to terahertz regime is theoretically investigated. Owing to these reasons, the absorption coefficients for passive, optical negative-index metamaterials (NIMs) prominently negative index materials (NIM).These have permitted emerging applications, concepts and devices to be developed in the last few years. This thesis discusses negative index metamaterials (NIMs) that exhibit negative refraction. 340-343, June 16-21, 2002, San Antonio, TX. 2 Medical Device Development Center, Daegu-Gyeongbuk Medical Innovation Foundation The negative permeability is realized around the ferromagnetic resonance (FMR) frequency which can be influenced by the dimension of the ferrites. We investigate a negative index metamaterial with a phase-sensitive near-field microscope and measure the optical phase as a function of distance. High-resolution . 140, 457{469, 2013 MULTI-BAND NEGATIVE REFRACTIVE INDEX IN FERRITE-BASED METAMATERIALS Ke Bi1, Ji Zhou1, *, Xiaoming Liu1, Chuwen Lan1, and Hongjie Zhao2 1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing An S-shaped, split-ring resonator was used as a unit cell to design homogeneous slabs of negative-index metamaterials. Positive Refractive Index Negative Refractive Index 13 How to create Metamaterials Need a Material with Negative e and m in the Same Frequency Range Thin Wires lead to Negative e 14 Split-Ring-Resonators 15 Examples 16 Applications I The perfect Lens Near-Field Enhancement 17 Nicholas Fang et al, Science, Vol. 2008, 33, 915-920. Summary . IEEE Metamaterials presentation-2.ppt The explosion of interest in metamaterials is due to the dramatically increased manipulation ability over light as well as sound waves. The main applications of negative index metamaterials (or lefthanded materials (LHM)) are connected with a remarkable property: the direction of the energy flow and the direction of the phase velocity are opposite in NIM that results unusual properties of electromagnetic waves propagating in these mediums. One of the most exciting opportunities for metamaterials is the development of negative-index materials (NIMs). IV, pp. Recently, artificially constructed metamaterials have become of considerable interest, because these materials can exhibit electromagnetic characteristics unlike those of any conventional materials. Metamaterials have earned their name with extraordinary properties such as negative refractive index and invisibility cloaking. Transcribed image text: 6) (20 pt) Negative-index metamaterials (a) Negative-index materials are allowed in Maxwell's equations, but they are not found in nature. A tunable dual-band ferrite-based metamaterial has been investigated by experiments and simulations. The results can be summarized as follows: 1. Metamaterials (MMs) are artificially engineered composites that attract considerable interests due to their exceptional electromagnetic properties, which are not typically found in nature, such as negative refractive index and cloaking[1-4].These MMs with various subwavelength resonant elements have offered magnetic and/or electric resonant responses to incident electromagnetic radiation . We can open the file negative_index.fsp which includes this material and can then use the script file magnetic_electric_lorentz.lsf to plot the resulting properties. A multi-band ferrite-based metamaterial has been investigated by experiments and simulations. index of this design process is evidenced. Th eir composition and morphology can be artifi cially tuned, and inclusions can be designed and placed at desired locations to achieve new functionality. Again, as for negative-index metamaterials, losses inherited from metallic ingredients are responsible 83. The overall design process consists largely of two steps, as described in Fig. Alexander . In particular, they have negative permittivity and permeability at some frequencies due to microscopic resonating structures [20]. As reverse-refraction media, these occur when both permittivity ε and permeability µ are negative. The property that is being designed for is a macroscopic property. A negative refractive index, a property that does not exist in natural materials, can be produced in so-called metamaterials by combining two building blocks; here it is shown that it is possible . 3D Negative Index Metamaterials Background. Gwiyeong Moon1 *, Jong-ryul Choi 2*, Changhun Lee 1, Youngjin Oh 3, Kyunghwan Kim 4, and Donghyun Kim 1† 1 School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea, 03722 . Realization of Negative-Refractive-Index in A striking example is the Cadet Chapel pipe organ at the US Military Academy in West Point, New York. The resonant wavelength increasing with the refractive index of the media makes the metamaterials potential platforms for both negative index structures and optical sensors. 2009). Recent advances in metamaterials research are described and the potential that these materials may hold for realizing new and seemingly exotic electromagnetic phenomena is discussed. this is a presentation on negative refractive index and metamaterials Metamaterials that have a negative index of refraction (negative-index metamate-rials or NIMs) may lead to the development of novel devices ranging from optical antennas with superior 2. negative refractive index. 1. Sort by: Metamaterials . Negative Refraction Contemporary Physics 45 191-202 (2004) Metamaterials and Negative Refractive Index Science 305 788-92 (2004) Some Popular Articles The Quest for the superlens Scientific American 60- 67 July (2006). Negative Index Metamaterials (NIMs), also called left-handed media or double negative metamaterials. Acoustic metamaterials with negative bulk modulus 4. An iterat … This material research was stimulated by the opportunity to develop an artificial media with negative refractive index and the application in superlens which allows super-resolution imaging. Negative-index metamaterial or negative-index material (NIM) is a metamaterial whose refractive index for an electromagnetic wave has a negative value over some frequency range.. NIMs are constructed of periodic basic parts called unit cells, which are usually significantly smaller than the wavelength of the externally applied electromagnetic radiation.The unit cells of the first . • In negative index metamaterials (NIM), both permittivity and permeability are negative resulting in a negative index of refraction. The proposed composite metamaterials consist of dielectric spheres embedded randomly in a semiconductor host medium. All these applications rely on the metamaterials acting as a homogeneous material. In the negative index region, the mea-sured refractive index changes towards zero as frequency increases, and both the real part and the imaginary part of Negative Refractive Index and Metamaterials - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. This should be a reasonable estimate of the properties in the microwave range. Also known as left-handed or negative index materials, the proposed materials were theorized to exhibit optical properties opposite to those of glass, air, and the other right-handed—or positive index—materials of our everyday world. These materials were theoretically predicted in 1967 by Veselago [4] (in English translation of his text it is erroneously stated that Recall that positive pressure in naturally occurring materials results in a volume decrease. (B) The power detected as a function of angle in a Snell's law experiment performed on a Teflon sample (blue curve) and a negative index sample (red curve). These are arti cial composite materials having extraordinary electromagnetic properties. Outline • Electrical Metamaterials(Plasmonics): A Route to Nanophotonics • Artificial Optical Magnetism in Metamaterials • Optical Negative-index Metamaterials • Active and Loss-Free Metamaterials • Toward Better Materials • Negative-Refraction in Semiconductor-based Metamaterials • Transformation Optics and Cloaking Due to having two negative permeability frequency regions around the two FMR frequencies, the metamaterials consisting of metallic wires and ferrite . The former is often referred to as left-handed materials (LHM), double negative material (DNG), or negative index metamaterials (NIMs). Among the most sought-after properties of metamaterials is the negative index of refraction. Because materials with negative index behave quite differently than materials with positive index, many familiar electromagnetic phenomena must be reconsidered. Reproduced by permission of the MRS Bulletin. 2008, 33, 915-920. 03/31 Reported in the August 2 issue of Nature, the technique results in an . Mechanical metamaterials 7. The relative permittivity (which in this case is equal to the relative permeability) is shown below. losses at optical wavelengths. These are arti cial composite materials having extraordinary electromagnetic properties. Progress In Electromagnetics Research, Vol. Close to the . All three NIM structures exhibit similar figures of merit; however, the transmission is higher for the NIM with rectangular holes as a result of an improved impedance match with the substrate-superstrate (air . 2. Institute of Physics of Russian Academy of Sciences, . An engineered material with simultaneous negative electric permittivity (ε) ∗ Part of the contents of this chapter has been published in MRS Bull. In the past 6 years, interests have grown in the research community on the "discovery" of materials that have been termed Metamaterials (MTM), also known as Double Negative Media (DNM), Left-Handed Media (LHM), Backward Wave Media (BWM), Negative Index Material (NIM) and Negative Refractive Index media (NRI)[1-3]. As the variation in the intrinsic carrier density in InSb due to a variation in temperature thus changes the plasma frequency, we show . Acoustic metamaterials with double negative parameters 5. 5721 18 Summary Symposium on Antennas and Propagation , Vol. The discovery of artificial electromagnetic materials, called metamaterials, not only redefines the human perception of constitutive parameters in electromagnetic theory, but also brings forward new phenomena, such as negative refraction. Wegener, N. Feth, and S. Linden, . The material properties (plasma resonance and collision frequency) were estimated from copper data in the visible. The negative real part of the . This effect emerges from unusual behavior of the device's relative permittivity Metamaterials Andrew Houck, Dave Kong, Matt Reynolds, Peter Eckley, J. Kong, Ike Chuang, Joe Jacobson Negative Index of Refraction Potential Application: Focusing Flat slab of metamaterial can act as a lens Lack of axis allows lens to focus 2D and 3D images Manufacturing Negative Materials have negative permittivity slightly below the plasma frequency, which is typically in the visible . A. Grbic and G.V. For example, for € =-1 + ið and u = -1 + i82, show that n should be negative (assume that 0<8 << 1,0<82<< 1). Metamaterials that are engineered media characterized by electromagnetic constitutive parameters with anomalous values may show counterintuitive properties in their interactions with electromagnetic waves. Basics of single negative and double negative metamaterials. The explanation to metamaterials is based mainly on the arrangement of the constituents rather than their individual properties. How Metamaterials Work Example: How to achieve negative index of refraction - - negative refraction can be achieved when both µr and εr are negative - negative µr and εr occur in nature, but not simultaneously -silver, gold, and aluminum display negative εr at optical frequencies -resonant ferromagnetic systems display negative µr at . The refractive index and maximum unit cell size NIM can be of an arbitrary determined from its photonic band structure in the zero-loss limit. similar to the one used for negative index metamaterials, except that the structures are designed to optimize the imaginary portion of the permittivity and permeability. Quantum switching in negative-index metamaterials. Plasmonic metamaterials are incarnations of materials first proposed by a Russian theorist in 1967. 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