title: Localization of electromagnetic wave with continuous eigenmodes in free space cavities of cylindrical or arbitrary shapes.
abstract: A scheme for constructing the electromagnetic localization structure (ELS) is proposed based on the transformation optics. The ELS may have a free space cavity of cylindrical or arbitrary shapes enclosed by a metamaterials layer. The electromagnetic field can be localized in the free space cavity with no energy leaked in the metamaterials layer and the eigenmodes of the cavity is continuous, which are novel properties that the reported metamaterials ELSs could not realize. The principle and feasibility of the scheme are described in detail through the cylindrical ELS. It is shown that all the material parameters of the designed cylindrical ELS change smoothly with finite values. Therefore it is more practical than the reported metamaterials ELS. In the designing of ELS, the space transformation function was solved via solving the Laplace equation with the Dirichlet boundary condition, which makes it possible to design the ELS of arbitrary shape. The viability of the ELS with arbitrary shape is analyzed and demonstrated by the full-wave numerical simulations.
authors: Xuan
authors: X
authors: Liu
authors: Xinxin
authors: X
authors: Li
authors: Jing
authors: J
authors: Zhou
authors: Zhaona
authors: Z
authors: Wang
authors: Jinwei
authors: J
authors: Shi
authors: Dahe
authors: D
authors: Liu