Optical negative index metamaterials
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 … WebAug 6, 2004 · Abstract. Recently, artificially constructed metamaterials have become of considerable interest, because these materials can exhibit electromagnetic characteristics unlike those of any conventional materials. Artificial magnetism and negative refractive index are two specific types of behavior that have been demonstrated over the past few …
Optical negative index metamaterials
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WebOptical negative-index metamaterials V. M. Shalaev Birck Nanotechnology Center and School of Electrical and Computer Engineering, Purdue University, [email protected] … WebJan 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 (...
WebNov 9, 2015 · The control of the optical activity and ellipticity of a medium has drawn considerable attention due to the recent developments in metamaterial design techniques and a deeper understanding of the light matter interaction in composite metallic structures. Indeed, recently proposed designs of metaatoms have enabled the realisation of … WebCurrently, negative-index metamaterials are being developed to manipulate electromagnetic radiationin new ways. For example, opticaland electromagneticproperties of natural materials are often altered through chemistry. With metamaterials, optical and electromagnetic properties can be engineered by changing the geometryof its unit cells.
WebJan 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. 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.
WebJul 1, 2006 · The index of refraction is a product of two complex functions, ɛ (ω) and μ (ω). By representing the magnetic and electric response functions by Lorentz oscillators ( eq 4) in complex form we see that the index squared is n 2 =ɛ (ω)μ (ω) = reeiθermeiθm. The complex index of refraction then becomes n = √ ( rermei(θe + θm)/2 ).
WebAug 15, 2008 · Metamaterials are artificially designed subwavelength composites possessing extraordinary optical properties that do not exist in nature. They can alter the … black swivel patio chairsWebA negative-index metamaterial causes light to refract, or bend, differently than in more common positive-index materials such as glass lenses. Negative-index metamaterial or negative-index material ( NIM) is a … fox anchors girlsWebSep 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 … black swivel oarlocksWebIn particular, three stochastic optimization tools (genetic algorithm, particle swarm optimization, and simulated annealing) are used for designing a low-loss optical negative … fox anchor scoldsWebSub-wavelength optical metamaterials, when integrated with optical recording media, can be used to achieve optical data density higher than limited by diffraction. ... A method was provided in 2002 to realize negative-index metamaterials using artificial lumped-element loaded transmission lines in microstrip technology. In 2003, complex ... black swivel dining chairWebJan 5, 2007 · Since the first demonstration ( 6) of an artificial NIM in 2000, metamaterials have exhibited a broad range of properties and potential applications: nearly zero reflectance; nanometer-scale light sources and focusing; miniaturization of devices, such as antennas and waveguides; and novel devices for medical imaging, especially magnetic … fox anchor shannon breamWebOptical negative-index metamaterials Artifi cially engineered metamaterials are now demonstrating unprecedented electromagnetic properties that cannot be obtained with … black swivel counter stools