Active metamaterials with negative static dielectric susceptibility
... One may ask whether the concept of metamaterials can be exploited to generate negative static susceptibility, given previous successes in making metamaterials with unusual properties such as negative refractive index [3]. The answer appears to be no, however, since there is no reason to suppose that ...
... One may ask whether the concept of metamaterials can be exploited to generate negative static susceptibility, given previous successes in making metamaterials with unusual properties such as negative refractive index [3]. The answer appears to be no, however, since there is no reason to suppose that ...
Nature: News and Views
... onators do when used at microwave this case the definition is slightly dif- (dotted arrows) but never beyond the normal. This limitation is frequencies. A characteristic of such ferent: large, positive permittivities are overcome if one of the materials has a negative refractive index. The same thin ...
... onators do when used at microwave this case the definition is slightly dif- (dotted arrows) but never beyond the normal. This limitation is frequencies. A characteristic of such ferent: large, positive permittivities are overcome if one of the materials has a negative refractive index. The same thin ...
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE)
... achieved different result, including smaller and higher frequency structures. The research which involves some of these types are discussed throughout the article. To date (December 2009) the capability for desired results in visible spectrum has not been achieved. However in 2005 , it was noted tha ...
... achieved different result, including smaller and higher frequency structures. The research which involves some of these types are discussed throughout the article. To date (December 2009) the capability for desired results in visible spectrum has not been achieved. However in 2005 , it was noted tha ...
Answer
... Visible light contains radiation in the wavelength range 4000Å (violet)7000Å (deep red). A material that appears red in transmission light absorbs all the wavelengths of the visible light in the range 4000-6500Å and transmits wavelengths >6500Å. This material must belong to semiconducting class of ...
... Visible light contains radiation in the wavelength range 4000Å (violet)7000Å (deep red). A material that appears red in transmission light absorbs all the wavelengths of the visible light in the range 4000-6500Å and transmits wavelengths >6500Å. This material must belong to semiconducting class of ...
Plasmonic Periodic Structures Composed by 2D Materials
... Department of Physics, University of Crete ...
... Department of Physics, University of Crete ...
Electromagnetic energy density in a single
... have been demonstrated, for example, superlensing and cloaking. To realize negative refraction, usually one unit cell of the periodic structure should contain both electric and magnetic resonators, giving rise to negative permittivity and negative permeability through electric and magnetic resonance ...
... have been demonstrated, for example, superlensing and cloaking. To realize negative refraction, usually one unit cell of the periodic structure should contain both electric and magnetic resonators, giving rise to negative permittivity and negative permeability through electric and magnetic resonance ...
Superconductivity is the capacity that certain materials attain, when
... Superconductivity is the capacity that certain materials attain, when they are sufficiently cooled, to allow electric current to pass through without resistance. One of its properties is magnetic levitation. The discovery of this phenomenon, in 1911, opened up a vast field of research into material ...
... Superconductivity is the capacity that certain materials attain, when they are sufficiently cooled, to allow electric current to pass through without resistance. One of its properties is magnetic levitation. The discovery of this phenomenon, in 1911, opened up a vast field of research into material ...
Negative Index of Refraction
... This causes the wave’s phase front to move in the opposite direction of the wave itself The energy of the wave is associated with the group velocity To the right we have an example of this. The Gaussian wave packet moves to the right while the wave front, (red point) moves to the left ...
... This causes the wave’s phase front to move in the opposite direction of the wave itself The energy of the wave is associated with the group velocity To the right we have an example of this. The Gaussian wave packet moves to the right while the wave front, (red point) moves to the left ...
Metamaterials and the Control of Electromagnetic Fields
... might ask if there is a new way to design electromagnetic systems exploiting this new flexibility. In an ideal world magnetic and electrical field lines can be placed anywhere that the laws of physics allow and a suitable metamaterial found to accommodate the desired configuration of fields. It was ...
... might ask if there is a new way to design electromagnetic systems exploiting this new flexibility. In an ideal world magnetic and electrical field lines can be placed anywhere that the laws of physics allow and a suitable metamaterial found to accommodate the desired configuration of fields. It was ...
Metamaterials Allow Manipulation of EM Waves from Low
... from basic magnets to microwaves to manipulating lightwaves. They exhibit behaviors that are opposite of what is found in natural materials. The particular behaviors of interest are negative index of refraction and negative permittivity and permeability. The implications of being able to control ele ...
... from basic magnets to microwaves to manipulating lightwaves. They exhibit behaviors that are opposite of what is found in natural materials. The particular behaviors of interest are negative index of refraction and negative permittivity and permeability. The implications of being able to control ele ...
Metamaterial
Metamaterials are materials engineered to have properties that have not yet been found in nature. They are made from assemblies of multiple elements fashioned from conventional materials such as metals or plastics. The materials are usually arranged in repeating patterns, often at microscopic or smaller scales that are smaller than the wavelengths of the phenomena they influence. Metamaterials derive their properties not from the properties of the base materials, but from their designed structure. Their precise shape, geometry, size, orientation and arrangement gives them their properties.Appropriately designed metamaterials can affect waves of electromagnetic radiation or sound in a manner not observed in bulk materials. Those that exhibit a negative index of refraction for particular wavelengths have attracted significant research. These materials are known as negative index metamaterials.Potential applications of metamaterials are diverse and include remote aerospace applications, sensor detection and infrastructure monitoring, smart solar power management, crowd control, radomes, high-frequency battlefield communication and lenses for high-gain antennas, improving ultrasonic sensors, and even shielding structures from earthquakes. Metamaterials offer the potential to create superlenses. Such a lens could allow imaging below the diffraction limit that is the minimum resolution that can be achieved by a given wavelength. A form of 'invisibility' was demonstrated using gradient-index materials. Acoustic and seismic metamaterials are also research areas.Metamaterial research is interdisciplinary and involves such fields as electrical engineering, electromagnetics, classical optics, solid state physics, microwave and antennae engineering, optoelectronics, material sciences, nanoscience and semiconductor engineering.