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A triple-grating cascade structure and an ultra-broadband absorber based on the triple-grating cascade structure

A cascade structure and absorber technology, applied in diffraction gratings, instruments, optics, etc., can solve the problems of high cost, complicated preparation, unfavorable mass production, etc., and achieve the effect of high absorption rate and wide spectral range

Active Publication Date: 2022-08-05
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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  • A triple-grating cascade structure and an ultra-broadband absorber based on the triple-grating cascade structure
  • A triple-grating cascade structure and an ultra-broadband absorber based on the triple-grating cascade structure
  • A triple-grating cascade structure and an ultra-broadband absorber based on the triple-grating cascade structure

Examples

Experimental program
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Embodiment 1

[0040] such as figure 1 , figure 2 The three-grating cascade structure shown is composed of three-grating cascade units. The three-grating cascade units include metal tungsten block 1, silicon dioxide medium 2 and strip-shaped metal tungsten 3 from left to right. The width is 427.352 nm and the height is 133.34 nm; the width of the silicon dioxide medium 2 is 309.137 nm and the height is 416.8 nm; the width of the strip metal tungsten 3 is 235.431 nm and the height is 333.34 nm.

Embodiment 2

[0042] A triple grating cascading structure is composed of three grating cascading units. The three grating cascading units sequentially 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 453.272 nanometers. The height is 124.86 nm; the width of the silicon dioxide medium is 314.271 nm and the height is 415.82 nm; the width of the strip metal tungsten is 232.457 nm and the height is 326.91 nm.

Embodiment 3

[0044] A triple grating cascading structure is composed of three grating cascading units. The three grating cascading units sequentially 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 width of the silicon dioxide medium is 318.176 nanometers and the height is 446.12 nanometers; the width of the strip metal tungsten is 284.65 nanometers and the height is 341.71 nanometers.

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Abstract

The invention relates to a triple grating cascade structure and an ultra-wideband absorber, belonging to the technical field of optical devices. A three-grating cascade structure is composed of three-grating cascade units, and the three-grating cascade units include metal tungsten blocks, silicon dioxide medium and strip-shaped metal tungsten sequentially from left to right. An ultra-wideband absorber based on a triple grating cascade structure, comprising: a base layer; a chromium film layer, which is formed on the surface of the base layer; and a silicon nitride layer, which is formed on the chromium film layer; and a graphene layer, which is formed on the silicon nitride layer; and a triple grating cascade structure layer formed on the graphene layer. The absorber of the invention can cover a wider spectral range, spanning part of ultraviolet light, all visible light and part of infrared light; the absorption rate is high, especially in the near-infrared band, the absorption rate is more than 90%.

Description

technical field [0001] The invention relates to a triple grating cascade structure and an ultra-wideband absorber, belonging to the technical field of optical devices. Background technique [0002] Metamaterials are a class of artificial composite materials, which can achieve resonance frequency and impedance matching through structural design, so that the operating frequency and bandwidth can be arbitrarily adjusted 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, which can be easily adjusted. up to several tenths of the wavelength, which is more beneficial to practical applications than traditional absorption structures. In 2008, Landy et al. adopted the method of matching with free space impedance to reduce reflection and maximize absorption, and developed the first broadband absorber. It has a very wide range of application prospects ...

Claims

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Application Information

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Patent Type & Authority Patents(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