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A method for realizing ultra-broadband light absorption and a composite microstructure

A composite microstructure and ultra-broadband technology, applied in optics, optical components, instruments, etc., can solve the problems of limited number of microstructure resonant units and increase the difficulty of preparation, and achieve high polarization-insensitive broadband absorption performance, excellent broadband light Absorption performance, the effect of enhancing absorption efficiency

Active Publication Date: 2022-07-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for multi-band metamaterial broadband absorbers, it is necessary to integrate two or more microstructure resonant units in one structural unit, which not only increases the difficulty of preparation, but also increases the number of microstructure resonant units that can actually be accommodated in one structural unit. The number is limited; for the hyperbolic metamaterial structure, in order to effectively use the slow optical waveguide mode to expand the bandwidth of light absorption, the structural unit often needs a gradually changing microstructure width, that is, the width of the microstructure in a structural unit increases with its own depth. increase, which brings great challenges to the fabrication of devices

Method used

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  • A method for realizing ultra-broadband light absorption and a composite microstructure
  • A method for realizing ultra-broadband light absorption and a composite microstructure
  • A method for realizing ultra-broadband light absorption and a composite microstructure

Examples

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Effect test

Embodiment 1

[0038] Example 1: Designing an ultra-broadband wave absorber in the visible-near-infrared band using metal / dielectric composite microstructures

[0039] Using metal / dielectric composite microstructure to design an ultra-broadband absorber in the visible-near-infrared band, the schematic diagram is as follows figure 1 shown. figure 1 It is a schematic diagram of the metal / dielectric composite microstructure in an embodiment of the present invention. The selected metal microstructure is a nano-pillar array, and the selected metal and dielectric materials are chromium (Cr) and silicon dioxide (SiO2) respectively. 2 ). where P is the period of the nanopillar array, d is the diameter of the nanopillar, h is the height of the nanopillar, h 1 for SiO 2 The thickness of the buffer layer, a total of 3 pairs of Cr / SiO 2 Multilayer stack, t m is the thickness of the metal Cr film, t d for SiO 2 The thickness of the dielectric film layer, the substrate is a Cr film with a sufficien...

Embodiment 2

[0042] Example 2: Broadband near-field reflection and light field localization induced by metal-dielectric periodic film stacks

[0043] Based on the calculation results of Example 1, in order to clarify the broadband light absorption mechanism corresponding to this structure, in figure 2 Under the parameter conditions of , in the band of broadband light absorption, four light absorption wavelengths with large difference are selected in turn along the wavelength increasing direction, and the strict coupled wave method is used to calculate the normalized electric field intensity distribution and energy flow direction corresponding to the structure. distribution, get image 3 .

[0044] image 3 is the normalized electric field intensity distribution and energy flow direction distribution of different wavelengths in an embodiment of the present invention, wherein the chromaticity bar represents the amplitude of the normalized electric field intensity, the arrow indicates the ...

Embodiment 3

[0046] Example 3: Angle-insensitive absorption phenomenon of metal / dielectric composite microstructure ultra-broadband absorber

[0047] Based on the metal / dielectric composite microstructure ultra-broadband absorber in Example 1, while the structural parameters remain unchanged, the incident angle is changed. For TM polarization and TE polarization, respectively, the strict coupled wave method is used to calculate the change of the absorption spectrum with the incident angle. curve, get Figure 4 .

[0048] Figure 4 is the variation curve of the absorption spectrum with the incident angle in an embodiment of the present invention, and the structural parameters are the same as figure 2 same. (a) corresponds to TM polarization; (b) corresponds to TE polarization. from Figure 4 It can be seen that when the incident angle increases from 0° to 60°, the absorber still has a broadband light absorption effect. In particular, for the TM polarization case, when the incident an...

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Abstract

The invention discloses a method for realizing ultra-broadband light absorption and a composite microstructure, which combines a metal-dielectric periodic film stack with a metal microstructure array, that is, a metal-dielectric periodic film stack is carried on top of a traditional metal-dielectric periodic film stack The metal microstructure array combines the broadband near-field reflection provided by the metal-dielectric periodic film stack and the surface plasmon resonance effect of the metal microstructure array to achieve ultra-broadband light absorption enhancement in the visible-near-infrared band. In addition, the broadband absorber designed by this method does not require the use of precious metals such as gold or silver, and the fabrication cost is relatively low, and it has superior polarization-insensitive broadband absorption performance and extremely high fabrication tolerance, which can be used in enhanced nano-imaging, stealth materials, It has great application prospects in fields such as solar cells, light modulators, and touch screens.

Description

technical field [0001] The invention relates to the fields of micro-electromechanical systems, photovoltaic solar energy, and photoelectric detection, in particular to a method for realizing ultra-broadband light absorption and a metal / dielectric composite microstructure. Background technique [0002] Metamaterial absorbers can use different resonance modes or optical field coupling effects in micro-nano structures, such as surface plasmon resonance, guided mode resonance, Fano resonance, electromagnetically induced transparency, etc., to realize the enhancement of light absorption efficiency of metamaterial devices. . This type of wave absorbing device is often based on metal / dielectric composite structure, and through the adjustment of structural parameters, such as adjusting the surface type, size, arrangement and orientation of the structural unit, the optical field localization and electromagnetic field enhancement effects are generated in the microstructure to achieve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/00
CPCG02B5/003G02B5/008
Inventor 桑田齐红龙尹欣王勋李国庆王跃科
Owner JIANGNAN UNIV
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