Chengfu Yang

Metamaterial electromagnetic concentrators with arbitrary geometries

The electromagnetic concentrators play an important role in the harnessing of light in solar cells or similar devices, where high field intensities are required. The material parameters for two-dimensional (2D) metamaterial-assisted electromagnetic concentrators with arbitrary geometries are derived based on transformation-optical approach. Enhancements in field intensities of the 2D concentrator have been shown by full-wave simulation. All theoretical and numerical results validate the material parameters for the 2D concentrator with irregular cross section we developed.

Electromagnetic concentrators with arbitrary geometries based on Laplace’s equation

Concentrators with arbitrary geometries are designed based on the numerical solution of Laplaces equation, with which the material parameters can be independently obtained without any knowledge of the corresponding coordinate transformation. Results show that the concentrator designed using the numerical method has the same scattering and concentrating properties as that designed using the analytical method, except for a slight difference in the stretching region, which, however does not influence the design of the concentrator. The method developed in this paper is general and flexible for designing arbitrary concentrators. The validity of such a method and the concentrating effects are confirmed by full-wave simulations.