The surrounding conductor has an inner diameter of 7.27 mm and a charge of 8.10 ♜. Lastly, a parallel FDTD method was also used to model another interesting coordinate transformation based device, an optical black hole, which can be characterised as an omnidirectional broadband absorber. Solutions of Selected Problems 26.1 Problem 26.11 (In the text book) A 50.0-m length of coaxial cable has an inner conductor that has a diameter of 2.58 mm and carries a charge of 8.10 ♜. The finiteness of such a nano-device and its impact on the system dynamic behaviour was numerically exploited. In this paper it is shown that the enhancement factor of the local electric field in metal covered ellipsoidal nanoparticles embedded in a dielectric host. (1.55) for a charge interaction with an independent (external) field, and a similarly structured formula (1.60), but with an additional factor 12, for the field induced by the charges under consideration. In Chapter 1, we have obtained two key results for the electrostatic energy: Eq. The device has its potential in subwavelength imaging at optical frequencies. This article considers the problem of finding the electrostatic potential that is given in terms of a scalar function called Green function in dielectric cylindrical nanoparticles with core-shell. 3.5: Electric Field Energy in a Dielectric. Furthermore, a parallel three-dimensional dispersive FDTD method was introduced to model a plasmonic nanolens. These new devices demonstrate super-absorptivity over a moderate wideband range, suitable both for microwave and optical applications. It was found that, by utilising inherent electric and magnetic losses of metamaterials, as well as additional lossy materials, perfect wave absorption can be achieved. Several ways to control and manipulate the loss in the electromagnetic cloak based on transformation electromagnetics were examined. Finally, more useful cloaking structures were proposed, which can operate over a broad frequency spectrum. The limitations of all these devices were thoroughly studied and explored. With a few modifications the method is able to simulate general media, such as concentrators and rotation coatings, which are produced by means of coordinate transformations techniques. To determine the specific surface area, nitrogenphysisorption was carried out. It was demonstrated that perfect ``invisibility'' from electromagnetic cloaks is only available for lossless metamaterials and within an extremely narrow frequency band. The core shell spheres were made by a spray coating with the aid of a pan coater. The proposed method can accurately model both lossless and lossy cloaks with ideal or reduced parameters. A novel radially-dependent dispersive FDTD algorithm was proposed and applied to simulate electromagnetic cloaking structures. During this PhD study, several finite-difference time-domain (FDTD) methods were developed to numerically investigate coordinate transformation based metamaterial devices. The effects of confinement potentials of the first and second materials, core size and first shell thickness on the confinement of electron, electron-donor atom, and exciton in cylindrical core.
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