Broadband THz metamaterial absorber based on multi-resonant absorption superposition

Abstract

The invention discloses a broadband THz metamaterial absorber based on multi-resonant absorption superposition, belongs to a THz absorber in the field of metamaterials and electromagnetic functional technology, and aimed at that the broadband THz metamaterial absorber includes an upper patterned functional material layer, an intermediate medium layer and a lower metal reflective layer; the upper patterned functional material layer is formed by arranging metamaterial unit structures, each metamaterial unit structure includes a circular ring structure in which four parallel openings and a cross arm are disposed, and four connecting arms of each cross arm are connected with four ARC segments of each circular ring structure; the lattice period of a metamaterial unit structure array is a 10um to 100um, each metamaterial unit structure has a line width of 0.5um to 10um, the arm length x of each connecting arm is 3um to 50um, and the width d of each parallel opening is 0.5um to 50um. The invention does not require complicated procedures, a difficult process and high production cost to achieve the purpose of terahertz absorption band spread.

Description

technical field [0001] The invention belongs to the technical field of metamaterials and electromagnetic functions, and relates to a terahertz absorber. Background technique [0002] Terahertz (THz, 1 THz=10 12 Hz) radiation or terahertz waves generally refer to electromagnetic waves with a frequency between 0.1THz and 10THz, which are located between microwaves and infrared light waves in the electromagnetic spectrum. In recent years, with the steady development of terahertz source and detection technology, terahertz technology has shown great scientific research value and application prospects in the fields of physics, chemistry, biology, medicine, and communication. However, to make good use of a spectrum resource, the organic whole composed of radiation sources, functional devices and detectors should be fully developed. Since similar devices based on traditional optical and electronic methods are not suitable in the terahertz band, and most conventional materials have...

AI Technical Summary

Problems solved by technology

Since the resonant peaks of most metamaterial devices are relatively independent and separated from each other, the absorption bandwidth corresponding to the single-peak resonance is narrow; and the existing technology generally achieves the resonant frequency band through gradual unit structure, multi-layer structure stacking or multiple structure compounding. For the purpose of widening, the above-mentioned widening method is difficult to realize in terms of technology, the process is complicated, and the preparation cost is high, which limits the promotion of the absorber

In addition, in the prior art, terahertz absorbers usually use high-conductivity metal materials such as gold and silver. The wide range of use of gold and silver and other high-conductivity metal materials severely limits the application of other materials to terahertz absorbers. middle

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