Multiband terahertz meta-material absorber

Abstract

The invention provides a multiband terahertz meta-material absorber, which belongs to the technical field of multiband terahertz meta-material absorbers and is used to solve the problem that high absorption of electromagnetic waves can be achieved only in a single, two or three frequency bands. The meta-material absorber of the invention is composed of a plurality of absorber units. Each absorberunit is composed of a bottom metal film 1, an intermediate loss medium 2 and a top metal film arranged in sequence from bottom to top, and the bottom metal film 1, the intermediate loss medium 2 and the top metal film cling to one another. The bottom metal film 1 is an all-metal film. The top metal film is an asymmetric metal split ring 3. The geometric center of the asymmetric metal split ring 3,the geometric center of the intermediate loss medium 2 and the geometric center of the bottom metal film 1 are in a straight line. By reasonably designing the geometric size and lattice period of theasymmetric metal split rings, electromagnetic waves vertically incident on the surface of a meta-material can be absorbed completely. The meta-material absorber provided by the invention has high absorption rate, is simple in structure, and has five absorbing peak points.

Description

technical field [0001] The invention relates to the technical field of terahertz, in particular to a multi-band terahertz metamaterial wave absorber. Background technique [0002] In the field of terahertz technology, the absorption and energy capture of terahertz waves are the basis for terahertz detection, and are also the core issues of terahertz wave calibration, regulation, conversion and application. Compared with pyroelectric materials and quantum well structures, terahertz absorbers constructed with metamaterials have comprehensive advantages such as high absorption rate, high integration, flexible design, and room temperature operation. [0003] At present, terahertz wave absorbers based on metamaterials are still facing the following serious problems: 1. The design of wave absorbers is mainly focused on single-band and double-band wave absorbers, which can no longer meet the anti-interference requirements of terahertz systems; 2. The large structural unit of the d...

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Problems solved by technology

[0003] At present, terahertz wave absorbers based on metamaterials are still facing the following serious problems: 1. The design of wave absorbers is mainly focused on single-band and double-band wave absorbers, which can no longer meet the anti-interference requirements of terahertz systems; 2. The large structural unit of the device is not conducive to the miniaturization of the device; 3. The complexity of the structure or the stacking of multi-layer structures increases the difficulty of device preparation and is not conducive to the practical application of the device

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