|Student Name:||Maj Jason Paul|
|Thesis:||Metamaterial Structure Design Optimization: A Study of the Cylindrical Cloak|
|Location:||BLDG 640 Rm 353|
|Date & Time:||02/19/2013 at 0830|
|Abstract:|| Previously, Transformational Optics (TO) has been used as a foundation for designing cylindrical cloaks. The TO method uses a coordinate transform to dictate an anisotropic material parameter gradient in a cylinder coating that guides waves around the cylinder to reduce the Radar Cross Section (RCS). The problem is that the material parameters required for the TO cloak are not physically realizable and thus must be approximated. This problem is compounded by the fact that any approximation deviates from the ideal design and will allow fields to penetrate the cloak layer and interact with the object to be cloaked. Since the TO method does not account for this interaction, approximating the ideal TO parameters is doomed to suboptimal results.
However, through the use of a Green’s function, an optimized isotropic cloaked cylinder can be designed in which all of the physics are accounted for. If the contribution due to the scatterer is 0, then the observer, regardless of position, will only observe the contribution due to the source and thus the object is cloaked from observation. The contribution due to the scatterer is then used as a cost function with an optimization algorithm to find the optimal parameters of an