Grapheme based electronically controlled terahertz attenuation piece, preparation method and utilization method

An attenuator and terahertz technology, applied in the field of terahertz band devices, can solve problems such as poor stability, non-tunable, narrow working frequency band, etc.

Inactive Publication Date: 2014-08-13
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, it must have relatively consistent conductivity over a wide terahertz band
It can be seen that the current effective terahertz band attenuation film is still lacking, and the existing methods and materials are faced with defects such as narrow working frequency band, poor stability, and non-tunability to varying degrees.

Method used

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  • Grapheme based electronically controlled terahertz attenuation piece, preparation method and utilization method
  • Grapheme based electronically controlled terahertz attenuation piece, preparation method and utilization method
  • Grapheme based electronically controlled terahertz attenuation piece, preparation method and utilization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] figure 1 Shown is an electronically controlled terahertz attenuator composed of two graphene layers, viewed from the side. The attenuation sheet includes a base 6, a three-layer structure is laid layer by layer above the base 6, including two graphene layers 1 and 3, and a dielectric layer 2 that completely separates the adjacent two graphene layers 1 and 3, graphite An electrode 4 is connected between the graphene layer 1 and the graphene layer 3 and a voltage 5 is applied.

Embodiment 2

[0084] figure 2 Shown is an attenuation sheet made of 4 graphene layers, including a substrate 6, and a 7-layer structure is laid layer by layer on the substrate 6, including 4 graphene layers and between every two adjacent graphene layers. Between the medium layer 2. From left to right in the figure, the first and third graphene layers are respectively connected to one electrode, and the second and fourth graphene layers are respectively connected to another electrode. The voltage on these two electrodes is 5, an odd number Layers and even-numbered graphene layers each have the same potential, and a voltage of 5 can be applied to adjust the conductivity of each graphene layer. exist figure 2 In , the electrodes are not shown. In practical applications, the connection between conductive wires and graphene should be realized by making electrodes.

[0085] In actual design, the number of graphene layers is not limited to 2 layers and 4 layers, but changes according to the a...

Embodiment 3

[0087] In this embodiment, we select the following devices to prepare attenuation sheets comprising different graphene layers:

[0088] Graphene sample (fixed) parameters: area 1cm 2 , carrier scattering probability 100cm -1 , Fermi velocity v F =1.1×10 6 m / s, test temperature: 300K, preparation method: CVD.

[0089] (non-fixed) parameters of graphene: number of layers: 2-6, voltage: 0-80V.

[0090] Dielectric layer: SiO 2 , thickness: 50nm; method: magnetron sputtering, refractive index: 1.5.

[0091] Substrate: Quartz, thickness 500 μm, refractive index 1.5.

[0092] Electrodes: copper, magnetron sputtering.

[0093] The frequency of the incident terahertz wave is 1 THz. The Fermi energy level of graphene is 0eV and -0.315eV, and the corresponding voltage is adjusted from 0V to 80V, which is the upper and lower limits of the change of the Fermi energy level of graphene.

[0094] get Figure 6 The variation range of the terahertz wave extinction degree of the graphene...

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Abstract

The invention discloses a grapheme based electronically controlled terahertz attenuation piece, a preparation method and a utilization method. The attenuation piece comprises a substrate; at least two layers of grapheme layers are paved on the substrate; a layer of medium layer is paved between every two adjacent layers of grapheme layers; the mediums layers separate the two layers of grapheme layers. According to the grapheme based electronically controlled terahertz attenuation piece, the regulation range of device attenuation degrees can be changed through different layers of the grapheme, a high attenuation degree is achieved theatrically, the attenuation degree parameters can be controlled due to control of the attenuation degree of the attenuation piece through voltage, and the application accuracy of the attenuation piece products is high and flexible.

Description

technical field [0001] The invention belongs to the technical field of terahertz band devices, in particular to a graphene-based electrically controlled terahertz attenuator, a preparation method and an adjustment method. Background technique [0002] The attenuation sheet can take advantage of the material's absorption characteristics of light waves, and placing it in the optical path can attenuate the light intensity to achieve the effect of controlling the input light intensity. The ability of light to pass through the attenuator is related to the type of material of the attenuator, and also related to parameters such as the thickness of the material. At present, the attenuators in the optical band mainly use the metal film layer with a linear gradient in thickness, so as to achieve mechanical adjustment, while the attenuators with electric adjustment are relatively rare. On the other hand, when a beam of light is not monochromatic but contains polychromatic light of dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
Inventor 任兆玉周译玄徐新龙白晋涛
Owner NORTHWEST UNIV(CN)
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