Multi-frequency terahertz metamaterial absorber based on surface plasmon polaritons

Abstract

The invention discloses a multi-frequency terahertz metamaterial absorber based on surface plasmon polaritons, the absorber is composed of an absorber unit array, the absorber unit is composed of a three-layer structure in which two metal layers, namely a top design metal pattern layer and a bottom metal backboard layer, are attached with a polyimide dielectric layer, and the three-layer structureis tightly attached; the top design metal pattern layer adopts a double-split-ring pattern orthogonal I-shaped pattern structure; each of the top design metal pattern layer and the bottom metal backplate layer adopts a gold and chromium double-layer metal composite structure, so that the adhesion between the structures is improved. The absorption peak based on the surface plasmon polariton modeis realized in the range of 0.3 THz to 2THz by utilizing the matching relationship between the structural period of the absorber unit and the size of the top-layer design metal pattern layer, and theabsorption peak has the characteristics of high absorption rate and high quality factor.

Description

technical field [0001] The invention relates to the field of metamaterial absorbers, in particular to a multi-frequency terahertz metamaterial absorber based on surface plasmons. Background technique [0002] With the development of a series of new materials and technologies, especially the development of artificial electromagnetic metamaterials and ultrafast technologies, terahertz-related technologies have developed rapidly. Terahertz waves refer to electromagnetic waves with a frequency range between 0.1THz and 10THz, which have the characteristics of low photon carrying energy, high signal-to-noise ratio, "transparency" of non-metallic non-polar materials, and the vibration and rotation energy of many biological macromolecules The phonon vibration energy level of many advanced materials is mostly in the THz frequency domain, which has broad application prospects in the fields of biochemistry, national defense and security, and sixth-generation communication equipment. C...

AI Technical Summary

Problems solved by technology

In recent years, research on terahertz metamaterial absorbers has continued to deepen. Traditional terahertz metamaterial absorbers that can only achieve perfect absorption characteristics cannot meet the requirements of practical applications. The design of terahertz metamaterial absorbers has gradually turned to Special performance devices with specified functions, designing a terahertz metamaterial absorber with high quality factor absorption response will have important application value in the field of sensing and detection

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