METHOD FOR CONSTRUCTING CONSTITUTIVE PARAMETER OF METAMATERIAL BASED ON TRANSFORMATION OPTICS

摘要

Provided in the present invention is a method for constructing a constitutive parameter of a metamaterial based on transformation optics. The metamaterial is used for preparing an OAM wave beam generator. A constitutive parameter of the metamaterial comprises a constitutive parameter of a transformation cylinder. The transformation cylinder is used for transforming a plane wave beam into a vortex wave beam with a topological charge. The method for constructing a constitutive parameter of a metamaterial based on transformation optics comprises the following steps: obtaining a proportionality coefficient according to a topological charge of the vortex wave beam with a specific topological charge; based on the proportionality coefficient, determining, by means of transformation optics, a first function relationship between a plane wave front and a target vortex wave front; and substituting the first function relationship into a first formula, and substituting an obtained result into a second formula to obtain a constitutive parameter of a transformation cylinder. In the present invention, based on the principle of transformation optics, a constitutive parameter of a metamaterial for preparing a transformation cylinder can be accurately constructed according to a topological charge of a vortex wave beam to be formed.