Saturday, November 23, 2013

Metamaterials

Metamaterials The new metamaterial world has liberated theorists to dream and challenged experimentalists to make them happen. coffin nail Pendry Metamaterials argon artificially structured materials that have properties that cannot be frame in nature. The literal definition comes from the Greek meta, meaning beyond. From the technological and engineering viewpoint, the interest in metamaterials is based on the possibility of designing devices and systems with new properties or functionalities, able to insure surface up new fields of application or to cleanse existing ones. There argon several types of metamaterials, to each one with contrastive applications. The first type of metamaterials that will be discussed argon photonic metamaterials, which are designed to interact with optical frequencies. These structures are make from at least two different materials, usually involving some(prenominal) metals and dielectrics. They are normally periodic, with the period be ing small compared to the optical wavelength. Therefore, the excess optical properties do not arise from photonic bandgaps, tho instead from an interaction which is more similar to that of atoms or ion in a normal solid medium. Figure 1. Band structure in insulators or semiconductors A bandgap is an energy range in a solid where no electron states can exist.
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In other(a) words, the bandgap is the difference between the bottom of the conduction band and the free of the valence band (Figure 1) in insulators and semiconductors. This is equal to the energy call for to free an outer shell electron from its orbit just about the nucleus. The next type of! metamaterial, which is the most studied one, is an electromagnetic metamaterial. forward to understanding electromagnetic metamaterials, a brief explanation of the electromagnetic spectrum must be presented. Figure 2: The electromagnetic spectrum The electromagnetic spectrum is the range of frequencies existing due to electromagnetic radiation, ranging from short wavelengths such(prenominal) as gamma rays to...If you want to get a respectable essay, indian lodge it on our website: BestEssayCheap.com

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