There are many potentially interesting phenomena that can be obtained with wave refraction in the “wrong” direction, what is commonly now referred to as negative refraction. All sorts of physically new operations and devices come to mind, such as new beam controlling components, re?ectionless interfaces, ?at lenses, higher quality lens or “super lenses, ” reversal of lenses action, new imaging components, redistribution of energy density in guided wave components, to name only a few of the possibilities. Negative index materials are generally, but not always associated with negative refracting materials, and have the added property of having the projection of the power ?ow or Poynting vector opposite to that of the propagation vector. This attribute enables the localized wave behavior on a subwavelength scale, not only inside lensesandinthenear?eldoutsideofthem, butalsoinprincipleinthefar?eld of them, to have ?eld reconstruction and localized enhancement, something not readily found in ordinary matter, referred to as positive index materials. Often investigators have had to create, even when using positive index materials, interfaces based upon macroscopic or microscopic layers, or even heterostructure layers of materials, to obtain the ?eld behavior they are se- ing. For obtaining negative indices of refraction, microscopic inclusions in a host matrix material have been used anywhere from the photonic crystal regime all the way into the metamaterial regime.
Table des matières
Negative Refraction of Electromagnetic and Electronic Waves in Uniform Media.- Anisotropic Field Distributions in Left-Handed Guided Wave Electronic Structures and Negative Refractive Bicrystal Heterostructures.- “Left-Handed” Magnetic Granular Composites.- Spatial Dispersion, Polaritons, and Negative Refraction.- Negative Refraction in Photonic Crystals.- Negative Refraction and Subwavelength Focusing in Two-Dimensional Photonic Crystals.- Negative Refraction and Imaging with Quasicrystals.- Generalizing the Concept of Negative Medium to Acoustic Waves.- Experiments and Simulations of Microwave Negative Refraction in Split Ring and Wire Array Negative Index Materials, 2D Split-Ring Resonator and 2D Metallic Disk Photonic Crystals.- Super Low Loss Guided Wave Bands Using Split Ring Resonator-Rod Assemblies as Left-Handed Materials.- Development of Negative Index of Refraction Metamaterials with Split Ring Resonators and Wires for RF Lens Applications.- Nonlinear Effects in Left-Handed Metamaterials.
A propos de l’auteur
The editors are well known senior research scientists at two nationally recognized research laboratories in the US, and the contributing authors, from internationally located universities, national labs, and industry, are all major contributors to the curently important and active field of negative refractive and negative index materials.
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