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A terahertz metamaterial absorber that suppresses infrared absorption

An infrared absorption and terahertz technology, applied in the field of metamaterials, achieves high robustness, suppression of infrared wave absorption, and good absorption rate

Active Publication Date: 2022-07-26
NAT SPACE SCI CENT CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a terahertz electromagnetic absorber that suppresses the absorption of infrared waves, which solves the problem of a large amount of absorption in the infrared frequency band existing in the existing terahertz metamaterial absorber technology. problem, greatly suppressing the noise caused by infrared absorption is of great significance for the development of terahertz thermal absorption detectors

Method used

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  • A terahertz metamaterial absorber that suppresses infrared absorption
  • A terahertz metamaterial absorber that suppresses infrared absorption
  • A terahertz metamaterial absorber that suppresses infrared absorption

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Effect test

Embodiment 1

[0044] A terahertz metamaterial absorber that suppresses infrared wave absorption, such as figure 2 and 3As shown, it includes a first metal pattern layer 1 , a dielectric layer 2 and a second metal reflection layer 3 . The first metal pattern layer 1 is located at the upper end of the dielectric layer 2 and is in contact with the dielectric layer 2 , and the second metal reflection layer 3 is located at the lower end of the dielectric layer 2 and is in contact with the dielectric layer 2 . The pattern on the first metal pattern layer 1 is formed by cutting out the thin line pattern 4 from the whole surface of the metal. The thin line pattern 4 is a circle with an outer circle radius r=8.7um, and the width of the thin line is d=0.2um. The arrangement of the thin line patterns 4 is a hexagonal arrangement, the width of the periodic unit is a=20um, and the length of the periodic unit is b=34.6um. The first metal pattern layer 1 is made of gold or copper, the second metal refle...

Embodiment 2

[0046] The only difference between Embodiment 2 and Embodiment 1 is that the material of the dielectric layer 2 is polyimide, and some of the parameters are adjusted. The adjusted parameters are that the thickness of the dielectric layer 2 is h2=1.15um. The characteristic double absorption peaks in the terahertz band of the obtained terahertz metamaterial absorber that suppress infrared wave absorption are located at 4.3THz and 11.2THz, as shown in Figure 7 shown.

Embodiment 3

[0048] A terahertz metamaterial absorber that suppresses infrared wave absorption, Figure 4 As shown, it includes a first metal pattern layer 1 , a dielectric layer 2 and a second metal reflection layer 3 . The first metal pattern layer 1 is located at the upper end of the dielectric layer 2 and is in contact with the dielectric layer 2 , and the second metal reflection layer 3 is located at the lower end of the dielectric layer 2 and is in contact with the dielectric layer 2 . The pattern on the first metal pattern layer 1 is formed by engraving the thin line pattern on the entire surface of the metal. The thin line pattern is a regular hexagon with side length L=6.7um, and the width of the thin line is d=0.2um. The first metal pattern layer 1 is made of gold or copper, the second metal reflective layer 3 is made of gold or copper, and the dielectric layer 2 is made of silicon. The thickness of the first metal pattern layer 1 is h1=0.2um, the thickness of the dielectric lay...

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Abstract

The invention discloses a terahertz metamaterial wave absorber that suppresses infrared absorption, relates to the technical field of metamaterials, and comprises a first metal pattern layer, a dielectric layer and a second metal reflection layer sequentially stacked from top to bottom. The first metal pattern layer is formed by cutting out periodically arranged thin line patterns on the entire surface, and the thin line patterns include one or more of squares, circles, and polygons with more than four sides. Sexual arrangements include square arrangements or hexagonal arrangements. The invention solves the problem that the existing terahertz metamaterial wave absorber technology has a large amount of absorption in the infrared frequency band, greatly suppresses the noise caused by infrared absorption, and has great significance for the development of terahertz thermal absorption detectors meaning.

Description

technical field [0001] The invention belongs to the technical field of metamaterials, in particular to a terahertz metamaterial wave absorber that suppresses infrared absorption. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency range of 0.1THz-10THz, and the frequency band is between microwave and infrared waves. Therefore, the detection of terahertz waves often adopts the technical means of detecting microwave and detecting infrared. Among them, using the method of detecting infrared waves to detect terahertz waves will inevitably absorb infrared waves, and infrared waves, as detection noise, are the biggest practical obstacle for terahertz wave absorption sensors. According to the calculation of Planck's black body radiation formula, at room temperature, the energy of infrared waves emitted by objects can reach more than ten thousand times the energy of terahertz waves. Practical value, or rather, these are the absorption of s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00H01Q17/00
CPCH01Q15/0086H01Q15/0026H01Q17/00
Inventor 翁建宏翟光杰姚旭日刘雪峰
Owner NAT SPACE SCI CENT CAS