Ultra wide band absorber based on cascade structure metamaterials

A cascade structure and metamaterial technology, applied in the direction of instruments, instrument parts, shielding, etc., can solve the problems of narrow absorption wavelength range, small incident angle, low absorption rate, etc., and achieve easy processing and preparation, lower absorption frequency, The effect of increasing the dielectric constant

Inactive Publication Date: 2015-06-24
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems that the existing ultra-broadband absorber has low absorption rate, small incident angle and narr

Method used

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  • Ultra wide band absorber based on cascade structure metamaterials
  • Ultra wide band absorber based on cascade structure metamaterials
  • Ultra wide band absorber based on cascade structure metamaterials

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specific Embodiment approach 1

[0014] Specific implementation mode one: as figure 1 As shown, an ultra-broadband absorber based on cascaded metamaterials in this embodiment consists of a metal plate substrate 1, a first dielectric layer 2, a first metal layer 3, a second dielectric layer 4, and a second metal layer 5 , the third dielectric layer 6, the third metal layer 7, the fourth dielectric layer 8, the fourth metal layer 9, the fifth dielectric layer 10, the fifth metal layer 11, the sixth dielectric layer 12, the sixth metal layer 13, the The seventh dielectric layer 14, the seventh metal layer 15, the eighth dielectric layer 16, the eighth metal layer 17, the ninth dielectric layer 18 and the ninth metal layer 19; the metal plate substrate 1 is horizontally placed on the bottom layer, in the The center position of the metal plate substrate 1 is arranged in parallel from bottom to top with a first dielectric layer 2, a first metal layer 3, a second dielectric layer 4, a second metal layer 5, a third d...

specific Embodiment approach 2

[0020]Embodiment 2: The difference between this embodiment and Embodiment 1 is: the metal plate substrate 1, the first metal layer 3, the second metal layer 5, the third metal layer 7, the fourth metal layer 9, The materials of the fifth metal layer 11, the sixth metal layer 13, the seventh metal layer 15, the eighth metal layer 17 and the ninth metal layer 19 are all gold, aluminum or copper, and the thickness is 20nm; the metal plate substrate 1 is a square metal plate with a side length of 400 nm. This setting makes the transmittance T(ω) 0, which meets the actual needs. Other steps and parameters are the same as in the first embodiment.

[0021] The thickness of the square metal plate in this embodiment is greater than the skin depth of the incident electromagnetic wave.

[0022] In this embodiment, the formula A(w)=1-R(ω)-T(ω) is used to calculate the absorptivity of the metamaterial absorber, wherein R(ω) is the reflectivity, and T(ω) is the transmittance. In order to ...

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the first dielectric layer 2, the first metal layer 3, the second dielectric layer 4, the second metal layer 5, and the third dielectric layer 6 and the diameter of the bottom surface of the third metal layer 7 is 175 nm. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

Provided is an ultra wide band absorber based on cascade structure metamaterials. The invention relates to the ultra wide band absorber, and aims at solving the problems that for an existing ultra wide band absorber, the absorption rate is low, the incident angle is small, the absorption wavelength range is narrow, and the ultra wide band absorber can not absorb across multiple wavebands. The ultra wide band absorber based on the cascade structure metamaterials adopts two ways, namely, interaction between device physical sizes and electromagnetic waves and interaction between dielectric materials and the electromagnetic waves, to act in a combined mode, so that coupled superposition is conducted on units with different sizes, the coupled superposition is conducted among different dielectric constants in the same unit, ultra wide bank absorption of the metamaterials on the electromagnetic waves is achieved, the absorption rate is over 92%, the absorption wavelength ranges from 284 nm to 1524 nm, partial ultraviolet waves, all visible light and partial near infrared waves are included, and under the incident condition of 40-degree angle of inclination, the absorption rate can still reach over 90%. The ultra wide band absorber based on the cascade structure metamaterials can be applied to the fields of solar cell absorption, thermal emitters and photoelectric equipment.

Description

technical field [0001] The invention relates to an ultra-broadband absorber. Background technique [0002] Metamaterials are man-made composite electromagnetic materials with extraordinary properties. They have become research hotspots in physics, materials science, engineering and chemistry. The use of electromagnetic metamaterials can achieve arbitrary "tuning" of electromagnetic wave properties, thereby realizing Exotic electromagnetic properties such as negative refractive index, sub-diffraction imaging, and electromagnetic cloaking. In recent years, electromagnetic resonant absorbers based on electromagnetic metamaterials can achieve 100% perfect absorption of electromagnetic waves of a specific frequency incident on the absorber by rationally designing the physical size and material parameters of the device, thus attracting great attention from domestic and foreign academic circles. . Contents of the invention [0003] The invention aims to solve the problems that ...

Claims

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Application Information

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IPC IPC(8): G12B17/02
Inventor 贺训军颜世桃张秦飞张景云吴丰民姜久兴
Owner HARBIN UNIV OF SCI & TECH
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