3-bit transmission type electromagnetic code metamaterial applied in terahertz band

Abstract

The present invention provides a 3-bit transmission type electromagnetic code metamaterial applied in a terahertz band. A basic unit structure is formed by the alternative arrangement of three layers of metal opening resonant ring structures and four layers of polyimide dielectric layers. Through the optimization design of the geometric parameter of an opening resonant ring structure, each unit can show eight independent refraction phases under the irradiation of a y polarization vertical incident electromagnetic wave, and the eight independent refraction phases are corresponding to number states '0' to '7'. According to digital codes designed in advance, number units are arranged on a two-dimensional plane, and the 3-bit transmission type electromagnetic code metamaterial is formed. In the terahertz band, the 3-bit transmission type electromagnetic code metamaterial can refract the incident electromagnetic wave, and the abnormal refraction is realized. Due to the excellent mechanical and chemical performance of the polyimide dielectric, the3-bit transmission type electromagnetic code metamaterial has the advantages of flexibility, corrosion resistance and physical wear resistance and has a wide application prospect in the aspects of terahertz imaging and communication.

Description

technical field [0001] The invention relates to a new type of artificial electromagnetic material, in particular to a transmissive electromagnetic coding metamaterial with abnormal refraction and non-diffraction Bessel beam functions applied in the terahertz band. Background technique [0002] In the past 20 years, metamaterials have gradually consolidated their unique position in the cutting-edge research field due to their unique electromagnetic properties beyond nature, attracting extensive attention from the physics and engineering communities. The permittivity and permeability of metamaterials can be artificially constructed, so that the acquisition of materials is no longer limited to nature. For arbitrary manipulation of electromagnetic waves, traditional solutions usually use a whole piece of dielectric material (traditional lens) or rely on the shape of a metal surface (traditional antenna) to regulate the distribution of electromagnetic fields, but such solutions r...

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Problems solved by technology

[0004] The unit design of the above-mentioned metamaterials is generally in the microwave frequency band, the volume is large, and it is inflexible, so it is difficult to conform to the object.

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