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A dual-dielectric broadband infrared absorbing metamaterial and its design method

A metamaterial and dual-media technology, applied in optics, instruments, optical components, etc., can solve the problems of complex design, limited bandwidth, and poor applicability, and achieve the effect of convenient design, easy fabrication, and simple structure

Active Publication Date: 2018-07-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Therefore, the existing infrared artificial electromagnetic materials have defects such as complex design, complex process, limited bandwidth, and poor applicability.

Method used

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  • A dual-dielectric broadband infrared absorbing metamaterial and its design method
  • A dual-dielectric broadband infrared absorbing metamaterial and its design method
  • A dual-dielectric broadband infrared absorbing metamaterial and its design method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dual-dielectric infrared absorbing metamaterials with a broadband absorption range of 5-8 μm, from bottom to top are TiN thin film, ZnSe thin film, MgF thin film and Al grating.

[0026] The thickness of the TiN film is 200nm, the thickness of the ZnSe film is 400nm, the thickness of the MgF film is 500nm, and the thickness of the Al grating is 60nm. The unit structure of the Al grating is composed of metal squares, the side length of the metal square is 1.7 μm, and the unit period is 5 μm. The simulation results obtained by the strict coupled wave method are as follows: figure 2 As shown, in the range of 5 μm-8 μm, the bandwidth of this embodiment at 80% absorption rate is 1.9 μm.

Embodiment 2

[0028] Dual-dielectric infrared absorbing metamaterials with a broadband absorption range of 8-14 μm, from bottom to top are TiN thin film, Ge thin film, ZnO thin film and Al grating.

[0029] The thickness of the TiN film is 200nm, the thickness of the Ge film is 600nm, the thickness of the ZnO film is 200nm, and the thickness of the Al grating is 130nm. The unit structure of the Al grating is composed of metal squares, the side length of the metal square is 2 μm, and the unit period is 5 μm. The simulation results obtained by the strict coupled wave method are as follows: image 3 As shown, in the range of 8 μm-14 μm, the bandwidth of this embodiment at 80% absorption rate is 3.7 μm.

[0030] In summary, the present invention is convenient in design, simple in structure and easy to manufacture. In the range of 5 μm-8 μm, the bandwidth of the present invention at 80% absorption rate reaches 1.9 μm; in the range of 8 μm-14 μm, the bandwidth of the present invention at 80% ab...

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Abstract

The invention belongs to the field of infrared artificial electromagnetic metamaterials, in particular to a double-medium broadband infrared absorbing metamaterial and a design method thereof. The metamaterial sequentially includes a TiN thin film, a first dielectric material thin film, a second dielectric material thin film and a metal grating from bottom to top. The present invention utilizes the high dielectric properties of the first dielectric material film to excite standing waves, metal gratings to excite air-metal surface plasmon elements, metal gratings and TiN substrates to excite magnetic resonance, and the second dielectric material film to reduce the excitation wavelength of magnetic resonance. By adjusting the size of the grating, the material of the dielectric layer, and the thickness of the dielectric layer, the three resonance modes of standing wave, surface plasmon element, and magnetic resonance are coupled to achieve broadband wave absorption in different infrared bands. The invention has the advantages of convenient design, simple structure and easy manufacture. In the range of 5μm-8μm, the bandwidth at 80% absorption rate reaches 1.9μm; in the range of 8μm-14μm, the bandwidth at 80% absorption rate reaches 3.7μm.

Description

technical field [0001] The invention belongs to the field of infrared artificial electromagnetic metamaterials, and relates to a double-medium broadband infrared absorbing metamaterial and a design method thereof. Background technique [0002] With the rapid development of artificial electromagnetic metamaterials, compared with traditional electromagnetic materials, infrared artificial electromagnetic metamaterials have attracted more and more attention because of their negative refractive index, perfect absorption and selective absorption. Broadband infrared absorption has always been a research hotspot in infrared artificial electromagnetic metamaterials. On the one hand, according to the Plank law of thermodynamics, for an object with a surface temperature between zero and one thousand degrees, its main infrared radiation band is located at 2 μm-14 μm. On the other hand, due to the different degrees of absorption of electromagnetic waves in different bands by the atmosph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/00G02B5/20G02B5/22
CPCG02B1/002G02B5/208G02B5/22
Inventor 周佩珩甄国帅杨林邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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