Optical negative index metamaterials
WebMar 9, 2016 · Materials with negative Poisson's ratio or negative refractive index are now classic examples. The effective mass density, which governs the propagation of elastic … WebFeb 17, 2014 · Dark energy with negative pressure and positive energy density is believed to be responsible for the accelerated expansion of the universe. Quite a few theoretical models of dark energy are based on tachyonic fields interacting with itself and normal (bradyonic) matter. Here, we propose an experimental model of tachyonic dark energy based on …
Optical negative index metamaterials
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WebIn particular, three stochastic optimization tools (genetic algorithm, particle swarm optimization, and simulated annealing) are used for designing a low-loss optical negative index metamaterial. A negative refractive index around − 0.8 + 0.2 i is obtained at a wavelength of 770 nm. WebApr 7, 2024 · The physics of metamaterials is discussed along with their relationships to the ideas of resonance. Properties of negative index of refraction, perfect lens, and unusual optical effects the new optics of metamaterial media makes available are examined. Related effects in acoustics are also covered.
WebNegative index materials, exhibit optical properties opposite to those of glass, air, and the other conventional materials. At the correct frequencies, the negative index materials refract electromagnetic waves in novel ways, to a zero index or negative index. WebJan 31, 2011 · Metamaterials showing negative refractive indexes, also called negative-index materials (NIMs), have also been demonstrated in the infrared range and at the …
WebPractical optical negative index materials based on coupled plasmon resonances must overcome reflection and absorption. Simulations show that matched impedance and … WebOct 14, 2007 · An optical metamaterial is a composite in which subwavelength features, rather than the constituent materials, control the macroscopic electromagnetic properties of the material. Recently ...
WebSep 19, 2024 · Negative refraction, an unnatural optical phenomenon in which the incident and and refracted waves reside on the same side of the face normal, possess have …
WebJan 1, 2011 · Optical Negative Index Metamaterials. Authors: Xuhuai Zhang Abstract Research of metamaterials focuses on unprecedented optical properties that may be obtained from composite media, and has... can shocks lift your vehicleWebJan 1, 2007 · A negative refractive index of n ′ = −0.3 ± 0.1 in the optical range was observed in 2005 at the telecommunication wavelength λ = 1.5 μm in an electron-beam-fabricated sample of paired rods (... can shockwave beat megatronflannel twin sheets xlTheoretical articles were published in 1996 and 1999 which showed that synthetic materials could be constructed to purposely exhibit a negative permittivity and permeability. These papers, along with Veselago's 1967 theoretical analysis of the properties of negative-index materials, provided the background to fabricate a metamaterial with … flannel turtleneck nightgownWebOptical negative-index metamaterials Artifi cially engineered metamaterials are now demonstrating unprecedented electromagnetic properties that cannot be obtained with … flannel twitter header tumblrWebMay 26, 2011 · The possibility of creating optical negative-index metamaterials (NIMs) using metallic and dielectric (insulating) nanostructures has triggered intense basic and … can shocks cause death wobbleWebJan 1, 2009 · Negative-Index Metamaterials W. Cai & V. Shalaev Chapter First Online: 10 September 2009 5093 Accesses 2 Citations Abstract The refractive index is one of the most important parameters for an optical medium. Defined as n = c/v, it measures the comparative velocity of light in different media. flannel twitter