Negative refraction artificial material based on iron-clad

Abstract

The invention relates to a negative refraction artificial material based on a metal covering layer, which comprises the following steps that (1) a quartz basal piece is selected, the surface of the quartz basal piece is polished, and then, a high-purity SiO2 film is evaporated and plated on the surface of the quartz basal piece; (2) the surface of a high-purity SiO2 film is evaporated and plated with a chrome film, and a layer of photoresist is evenly coated on the high-purity SiO2 film; (3) an electron beam photoetching method is adopted, and a medium grating structure is prepared on the photoresist; (4) a wet etching technology is adopted, the photoresist is used as a mask, and the exposed chrome film is etched; (5) a dry etching technology is adopted, the chrome film is used as the mask, the medium grating structure is etched on the high-purity SiO2 film, and the chrome film is removed; (6) a vacuum evaporation technology is adopted, a metal layer is evaporated and plated on the SiO2 grating structure, the thickness of the metal layer is h, and the negative refraction artificial material based on the metal covering layer is completely prepared. The invention has the advantages of convenient preparation, little single-layer consumption and signal-layer normal incidence and has a wide application prospect in the fields of magnetic resonance, near field optics, stealth materials, and the like.

Description

technical field [0001] The invention relates to the design and manufacture of an artificial composite structure material which utilizes the electromagnetic properties of the metal covering layer on the grating to realize negative refraction in the visible light frequency band and near-zero refraction characteristics. technical background [0002] The effective refractive index is an important parameter for the interaction between the material and the external electromagnetic field, and a requirement for the realization of effective negative or zero refractive index is the need for a negative effective magnetic permeability at the designed band or frequency point. At present, the existing The method is: the artificial composite material with negative magnetic permeability in the near-infrared band, especially in the visible light band, utilizes the periodically arranged nano-scale non-magnetic unit structure to form resonance with the external excitation electromagnetic wave, ...

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to propose a method for realizing negative refraction and near-zero refraction in the visible light frequency band by using the electromagnetic properties of the metal coating layer on the grating in view of the shortcomings of the existing artificial composite materials for magnetic resonance.

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