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Design method of terahertz broadband absorption metamaterial

A design method and metamaterial technology, applied in optics, instruments, electrical components, etc., can solve the problem of narrow absorption bandwidth and achieve the effect of broadening the absorption spectrum

Inactive Publication Date: 2017-08-25
HUBEI UNIV OF TECH
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Problems solved by technology

[0004] Although artificial electromagnetic media can achieve ultra-thin and polarization-insensitive properties in any wavelength band, many absorption bandwidths are relatively narrow.

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  • Design method of terahertz broadband absorption metamaterial
  • Design method of terahertz broadband absorption metamaterial
  • Design method of terahertz broadband absorption metamaterial

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Embodiment Construction

[0017] The following figures further illustrate the present invention in conjunction with the accompanying drawings and embodiments.

[0018] A design method for a terahertz broadband absorption metamaterial, comprising the following steps:

[0019] Step (1) According to the effective medium theory, the performance of metamaterial terahertz materials is determined by the magnetic permeability μ and the dielectric constant ε, while the reflectivity R(ω) and transmittance T(ω) depend on the refractive index n and wave impedance. Z, both related to permeability μ and dielectric constant ε;

[0020] Both the reflectance R(ω) and the transmittance T(ω) are related to the S parameter, S 11 is the reflection coefficient, S 21 is the transmission coefficient, where the reflectance R(ω)=|S 11 | 2 , transmittance T(ω)=|S 21 | 2 ;

[0021] Through the finite element method, the S-parameters are obtained by simulation. In the simulation, the frequency domain calculation mode TM po...

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Abstract

The invention belongs to the field of electromagnetic wave absorption and radiation control, and in particular relates to a design method of a terahertz broadband absorbing metamaterial. According to the effective medium theory, and using CST microwave studio to obtain S parameters through frequency domain simulation, the periodic unit structure is at x Both the and y directions are periodically distributed, and are set as periodic boundary conditions. Combining the parameters S11 and S21 obtained by scanning, the impedance value is calculated. By changing the period of the unit structure and the size of the metal thin film and dielectric material, the corresponding absorption frequency is adjusted, and multiple metal thin films and dielectric materials are cross-stacked in one unit period, so that the absorption lines corresponding to different resonant circular frustums are superimposed. The invention can effectively broaden the absorption spectrum of the terahertz frequency band, so that the frequency band with an absorption rate exceeding 90% can be widened, and meanwhile, a certain high relative absorption bandwidth can be guaranteed. And the first 9 absorption peaks are caused by the interior of the unit structure, so they are not affected by the period.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave absorption and radiation control, in particular to a design method of a terahertz broadband absorption metamaterial. Background technique [0002] Electromagnetic metamaterials are artificial materials formed by periodic arrangement of certain geometric structural units. Usually, they have some exotic physical properties, so they have broad application prospects, such as infrared detectors, radar stealth, and thermal radiators. Absorbing materials existing in nature cannot match the impedance of free space with their own impedance, so there is a certain reflection and cannot completely absorb electromagnetic waves; at the same time, it is difficult for natural materials to have high loss in a wide frequency band, so the volume of the absorbing material is Relatively large, bandwidth is often limited. [0003] In 2008, Professor W. Padilla of Boston College and others first proposed a perfect a...

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Application Information

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IPC IPC(8): H01Q17/00G02B1/00
CPCH01Q17/008G02B1/002
Inventor 刘凌云王建袁能李仄立杨亦雯
Owner HUBEI UNIV OF TECH
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