title: Equivalent configurations of optical transformation media.
abstract: We demonstrate that a medium consisting of two adjoining distinct layers of transformation materials, corresponding respectively to two linear coordinate transformations, can behave effectively as that of the same region transformed by another linear transformation. The equivalence means that, irrespective of the direction of incident wave, the fields of the medium exterior to the transformed regions of the two configurations are exactly the same. This property can also apply to a domain that is transformed by a piecewise linear transformation function, and to a medium that is mapped by a general curved function. This proof is shown analytically based on a rigorous Fourier-Bessel analysis. The equivalence suggests that, for a given transformed domain, one can find an infinite number of complementary media that altogether can give a desired effective response of certain transformation path.
authors.affiliation: Department of Civil Engineering, National Cheng Kung University, Tainan 70101, Taiwan. tchen@mail.ncku.edu.tw
authors.forename: Tungyang
authors.initials: T
authors.lastname: Chen
authors.forename: Shen-Wen
authors.initials: SW
authors.lastname: Cheng
authors.forename: Chung-Ning
authors.initials: CN
authors.lastname: Weng
mesh_terms: D000465:Algorithms; D016880:Anisotropy; D005583:Fourier Analysis; D008422:Materials Testing; D015233:Models, Statistical; D055095:Optics and Photonics; D011827:Radiation