Metamaterials

Metamaterials The new metamaterial world has liberated theorists to dream and challenged experimentalists to make them happen. cig atomic number 18tte Pendry Metamaterials argon artificially social systemd materials that have properties that cannot be do 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 chink surface up new fields of application or to cleanse existing ones. There argon several types of metamaterials, from each one with contrastive applications. The first type of metamaterials that will be discussed are photonic metamaterials, which are designed to interact with visual frequencies. These structures are do from at least two different materials, usually involving some(prenominal) metals and dielectrics. They are normally periodic, with the period being small compared to the optical wavelength. Therefore, the excess optical properties do not arise from photonic bandgaps, however 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.

In other(a) words, the bandgap is the difference between the bottom of the conduction band and the drop off of the valence band (Figure 1) in insulators and semiconductors. This is equal to the energy demand to free an outer shell electro n from its orbit nigh the nucleus. The ne! xt type of metamaterial, which is the most studied one, is an electromagnetic metamaterial. foregoing 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, fiat it on our website: BestEssayCheap.com

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