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Three-grating cascade structure and ultra-wideband absorber based on three-grating cascade structure

A technology of cascade structure and absorber, which is applied in the direction of diffraction grating, instrument, optics, etc., can solve the problems of unfavorable batch production, narrow absorption bandwidth, complicated preparation, etc., and achieve the effect of convenient preparation, high absorption rate and wide spectral range

Active Publication Date: 2020-03-27
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some of the above methods are complicated to prepare and high in cost, which is not conducive to mass production; some have relatively simple structure, but narrow absorption bandwidth

Method used

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  • Three-grating cascade structure and ultra-wideband absorber based on three-grating cascade structure
  • Three-grating cascade structure and ultra-wideband absorber based on three-grating cascade structure
  • Three-grating cascade structure and ultra-wideband absorber based on three-grating cascade structure

Examples

Experimental program
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Effect test

Embodiment 1

[0040] a kind of like figure 1 , figure 2 The three-grating cascaded structure shown is composed of three-grating cascaded units. The three-grating cascaded unit includes metal tungsten block 1, silicon dioxide medium 2 and strip-shaped metal tungsten 3 from left to right. The metal tungsten block 1 The width is 427.352 nanometers and the height is 133.34 nanometers; the silicon dioxide medium 2 has a width of 309.137 nanometers and a height of 416.8 nanometers; the strip-shaped metal tungsten 3 has a width of 235.431 nanometers and a height of 333.34 nanometers.

Embodiment 2

[0042] A three-grating cascade structure, which is composed of three-grating cascade units. The three-grating cascade units include metal tungsten blocks, silicon dioxide dielectrics and strip-shaped metal tungsten in sequence from left to right. The width of the metal tungsten blocks is 453.272 nanometers. The height is 124.86 nanometers; the silicon dioxide medium has a width of 314.271 nanometers and a height of 415.82 nanometers; the strip-shaped metal tungsten has a width of 232.457 nanometers and a height of 326.91 nanometers.

Embodiment 3

[0044] A three-grating cascade structure, which is composed of three-grating cascade units. The three-grating cascade units include a metal tungsten block, a silicon dioxide medium, and a strip-shaped metal tungsten from left to right. The width of the metal tungsten block is 481.362 nanometers. The height is 138.74 nanometers; the silicon dioxide medium has a width of 318.176 nanometers and a height of 446.12 nanometers; the strip-shaped metal tungsten has a width of 284.65 nanometers and a height of 341.71 nanometers.

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Abstract

The invention relates to a three-grating cascade structure and an ultra-wideband absorber, and belongs to the technical field of optical devices. The three-grating cascade structure is composed of a three-grating cascade unit, and the three-grating cascade unit sequentially comprises a metal tungsten block, a silicon dioxide medium and strip-shaped metal tungsten from left to right. The inventiondiscloses an ultra-wideband absorber based on a three-grating cascade structure. The ultra-wideband absorber based on the three-grating cascade structure comprises a substrate layer; a chromium film layer which is formed on the surface of the substrate layer; a silicon nitride layer which is formed on the chromium film layer; and a graphene layer formed on the silicon nitride layer, and the three-grating cascade structure layer is formed on the graphene layer. The absorber disclosed by the invention can cover a wider spectral range and strides over part of ultraviolet light, all visible lightand part of infrared light; the absorptivity is high, especially in the near-infrared band, and the absorptivity reaches 90% or above.

Description

technical field [0001] The invention relates to a three-grating cascade structure and an ultra-broadband absorber, belonging to the technical field of optical devices. Background technique [0002] Metamaterials are a kind of artificial composite materials, which can achieve resonant frequency and impedance matching through structural design, so that the operating frequency and bandwidth can be adjusted arbitrarily according to requirements; at the same time, the depth of the structure itself is sub-wavelength scale, so that the thickness of the metamaterial electromagnetic structure is very small. Up to a few tenths of the wavelength, which is more conducive to practical applications than traditional absorbing structures. Since Landy et al. developed the first broadband absorber in 2008 by using the impedance matching method with free space to reduce reflection and maximize absorption, it has been widely used in electromagnetic stealth, thermal radiation, thin-film solar ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B5/18
CPCG02B5/003G02B5/1861
Inventor 赵洪霞丁志群程培红
Owner NINGBO UNIVERSITY OF TECHNOLOGY