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Method and device for realizing wave absorbing of graphene at visible light waveband

A graphene and visible light technology, applied in optics, optical components, instruments, etc., can solve the problems of sensitivity to incident angle changes, low light absorption efficiency, narrow light absorption bandwidth, etc.

Active Publication Date: 2019-01-11
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a device and method for realizing graphene absorbing waves in the visible light band, which solves at least one of the following technical problems: the existing methods have narrow light absorption bandwidth, low light absorption efficiency, or light absorption efficiency is sensitive to incident angle changes

Method used

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  • Method and device for realizing wave absorbing of graphene at visible light waveband
  • Method and device for realizing wave absorbing of graphene at visible light waveband
  • Method and device for realizing wave absorbing of graphene at visible light waveband

Examples

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Effect test

Embodiment 1

[0039] Example 1: Broadband absorption of graphene in the visible light band based on a multi-groove structure

[0040] A multi-groove structure is used to design a graphene broadband absorber in the visible light band. A cell of the multi-groove structure is composed of five narrow metal grooves with the same width and different depths. The metal grooves and their tops are filled with dielectric materials. layer, and graphene is deposited over the dielectric material capping layer. For TM polarized incident light, due to the cavity resonance effect of metal grooves, grooves with different depths correspond to different light absorption wavelengths of graphene. The combination of five grooves with different depths can enhance the interaction between light and graphene in the visible light band. Further, the broadband light absorption enhancement of graphene in the visible light band can be realized.

[0041] The selected design band is the visible light band (400-800nm), and ...

Embodiment 2

[0042] Example 2: A method for regulating graphene light absorption channels based on a single groove structure

[0043] Compared with the multi-groove structure, there is only one metal groove in a primitive cell of the single-groove structure. By changing the depth of the metal groove in the single groove structure, the light wavelength corresponding to the cavity resonance of the metal groove is changed, thereby changing the position of the light absorption channel of the graphene. Therefore, for the single groove structure, by selecting different groove depths, the selective light absorption enhancement of graphene can be achieved at different wavelength positions.

[0044] Under the condition of keeping the structure parameters of multi-groove unchanged, the five grooves in the original cell are reduced to one groove, and the width w of the groove remains unchanged, that is, the structural parameters are: Λ=300nm, t=5nm, w=30nm, D=100nm, using FDTD method, combined with ...

Embodiment 3

[0045] Example 3: Angle-insensitive broadband light absorption based on multi-groove structure graphene

[0046] Based on Example 1, under the condition of keeping the structural parameters unchanged, that is, Λ=300nm, t=5nm, w=30nm, D=100nm, d 1 =20nm, d 2 =35nm, d 3 = 50nm, d 4 =80nm, d 5 =90nm, adopt the FDTD method, and in conjunction with formula (4), calculate the influence of incident angle variation on the graphene absorption spectrum curve of multi-groove structure, get Figure 4 . From Figure 4 It can be seen that the graphene broadband absorber based on the multi-groove structure has a very high angle tolerance because the change of the incident angle has little effect on the cavity resonance effect. When the incident angle increases from 0° to 60°, graphene still has Excellent broadband light absorption effect, this feature has extremely high application value.

[0047] In practical applications, the metal can be deposited on the substrate by means of elect...

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Abstract

The invention discloses a method and a device for realizing wave absorbing of graphene at a visible light waveband, and belongs to the field of photoelectric detection and micro-nano optical, mechanical and electrical systems. A multi-groove structure provided by the invention is a periodic micro-structure, a primitive cell (a basic unit of the structure) of the periodic micro-structure is formedby a plurality of narrow metal grooves with the same width and different depths, a dielectric coating layer is filled into the grooves and above the grooves, and the graphene is deposited above the dielectric coating layer. For TM polar incident light waves, due to a cavity resonance effect of the grooves, the grooves with different depths correspond to different graphene light absorption wavelengths, and broadband absorption of the graphene at the visible light waveband can be realized through combination of the grooves with the different depths. In addition, an absorption spectrum of a waveabsorber is insensitive to the change of an incident angle, and even the incident angle is obviously changed, the graphene still has excellent broadband light absorption performance; and the method and the device have an application prospect in the fields such as light modulators, solar cells, touch screens, biological sensing and the like.

Description

technical field [0001] The invention relates to a method for realizing graphene absorbing waves in the visible light band and a wave absorbing device, which belong to the field of photoelectric detection and micro-nano opto-electromechanical systems. Background technique [0002] Graphene, as a zero-bandgap material, has aroused great interest in materials science, condensed matter physics and engineering circles for its unique photoelectric properties. In the terahertz and mid-infrared bands, because graphene has high carrier mobility and adjustable conductivity, it can support the transmission of surface plasmons, and has a strong binding effect on the electromagnetic field at the interface, which can form extremely strong The light interacts with graphene, so graphene can achieve nearly 100% light absorption efficiency at the resonance wavelength. However, in the visible to near-infrared band, the light absorption efficiency of single-layer graphene is determined by its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00
CPCG02B5/003
Inventor 桑田高健尹欣王啦齐红龙
Owner JIANGNAN UNIV
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