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Polarization-independent ultra-narrow multiband tunable perfect absorber

A multi-band, absorber technology, applied in the field of optical properties, can solve the problems of single working frequency band, limited application range of metamaterial absorbers, fixed bandwidth working frequency, etc., and achieves the effects of high sensitivity, simple structure and easy manufacturing.

Active Publication Date: 2019-10-18
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most surface plasmon-based perfect absorbers have a single operating frequency band, wide bandwidth, and fixed operating frequency, which largely limits the application range of metamaterial absorbers.

Method used

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  • Polarization-independent ultra-narrow multiband tunable perfect absorber
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  • Polarization-independent ultra-narrow multiband tunable perfect absorber

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A polarization-independent ultra-narrow multi-band tunable perfect absorber, from bottom to top:

[0039] A gold layer having a thickness of 100 nanometers;

[0040] a layer of silicon dioxide disposed on the gold layer having a thickness of 120 nanometers;

[0041] The periodic gold nanostructure array layer arranged on the silicon dioxide layer includes several gold nano cylinders arranged with a period of 600 nanometers, the radius (R) of each gold nano cylinder is 210 nanometers, and each gold nano cylinder Etching has triangular prism air hole in the body; The center of the equilateral triangle of the bottom surface of the triangular prism air hole overlaps with the center of the circular bottom surface of the gold nano cylinder, and the height (h △ ) is 180 nm, the height of triangular prism air holes and gold nanocylinders (h 1 ) are both 30 nm.

[0042] figure 2 Triple-band absorption spectrum plot of the polarization-independent ultranarrow multiband tunab...

Embodiment 2

[0044] A polarization-independent ultra-narrow multi-band tunable perfect absorber, from bottom to top:

[0045] A gold layer having a thickness of 100 nanometers;

[0046] a layer of silicon dioxide disposed on the gold layer having a thickness of 120 nanometers;

[0047] The periodic gold nanostructure array layer arranged on the silicon dioxide layer includes several gold nano cylinders in a periodic array of 500 nanometers, the radius (R) of each gold nano cylinder is 210 nanometers, and each gold nano cylinder Etching has triangular prism air hole in the body; The center of the equilateral triangle of the bottom surface of the triangular prism air hole overlaps with the center of the circular bottom surface of the gold nano cylinder, and the height (h △ ) is 180 nm, the height of the triangular prism air hole and the gold nano cylinder (h 1 ) are all 30 nanometers.

[0048] image 3 Triple-band absorption spectrum plot of the polarization-independent ultranarrow multiba...

Embodiment 3

[0050] A polarization-independent ultra-narrow multi-band tunable perfect absorber, from bottom to top:

[0051] A gold layer having a thickness of 100 nanometers;

[0052] a layer of silicon dioxide disposed on the gold layer having a thickness of 120 nanometers;

[0053] The periodic gold nanostructure array layer arranged on the silicon dioxide layer includes several gold nano cylinders in a periodic array of 600 nanometers, the radius (R) of each gold nano cylinder is 210 nanometers, and each gold nano cylinder Etching has triangular prism air hole in the body; The center of the equilateral triangle of the bottom surface of the triangular prism air hole overlaps with the center of the circular bottom surface of the gold nano cylinder, and the height (h △ ) is 195 nanometers, the height of triangular prism air holes and gold nano cylinders (h 1 ) are all 30 nanometers.

[0054] Figure 4 Triple-band absorption spectrum plot of the polarization-independent ultranarrow mu...

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Abstract

The invention provides a polarization-independent ultra-narrow multiband tunable perfect absorber, and belongs to the field of metamaterials. The absorber comprises a metal layer, a dielectric layer and a periodic metal nanostructure array layer; the metal layer as a reflection layer is arranged on a bottom layer; the dielectric layer is positioned between the metal layer and the periodic metal nanostructure array layer; and the periodic metal nanostructure array layer is formed by periodically arranging metal cylinders with air holes etched in the middles. According to the absorber, ultra-narrow multiband perfect absorption can be realized, and the perfect absorption is insensitive to polarization state change under normal incident light. The maximum absorption of the absorber reaches 99.9%; the maximum bandwidth does not exceed 30 nm; and the sensing sensitivity reaches 325 nm / RIU.

Description

technical field [0001] The invention relates to the technical field of optical characteristics, in particular to an ultra-narrow multi-band tunable perfect absorber irrelevant to polarization. Background technique [0002] Surface plasmons (Surface Plasmons, SPs) are collective oscillation modes caused by free electrons on the surface of metals under the irradiation of light, which can form a strong local electromagnetic field enhancement effect on the metal surface, resulting in various novel Optical phenomena, such as Fano resonance, enhanced light transmission, and local electromagnetic field enhancement effects, etc. [0003] Electromagnetic metamaterials, which refer to a class of artificial composite structures or composite materials with extraordinary electromagnetic properties that natural materials do not have, have attracted extensive attention from researchers around the world in recent years. Many anomalous physical optical phenomena such as negative refractive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B1/00
CPCG02B5/003G02B5/008G02B1/002
Inventor 刘桂强施雷雷刘正奇李玉银刘晓山柳叶唐倩
Owner JIANGXI NORMAL UNIV
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