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Terahertz switch and control method based on periodic graphene structure absorption characteristics

A technology with absorption characteristics and graphene, which is applied in the field of terahertz switches, can solve problems such as narrow working bandwidth, low input signal fault tolerance, and affecting applications, and achieve the effects of wide absorption bandwidth, widened application range, and fast switching speed

Active Publication Date: 2020-01-21
PEKING UNIV
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Problems solved by technology

However, this graphene switch has certain limitations, mainly in the narrow working bandwidth, and the low fault tolerance for input signals with certain broadening or fluctuations, which affects its application in actual scenarios.

Method used

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  • Terahertz switch and control method based on periodic graphene structure absorption characteristics
  • Terahertz switch and control method based on periodic graphene structure absorption characteristics
  • Terahertz switch and control method based on periodic graphene structure absorption characteristics

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Embodiment Construction

[0033] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0034] Such as figure 1 As shown, the terahertz switch based on the absorption characteristics of the periodic graphene structure of this embodiment includes: a two-layer graphene array and an insulating dielectric layer; wherein, each layer of graphene array includes a plurality of graphene units, and a plurality of graphene The units are arranged in a periodic two-dimensional structure, and the two-layer graphene array is respectively pasted on the upper surface and the lower surface of the insulating medium layer; the graphene units of the graphene array on the upper surface are strip-shaped, and the graphene array on the lower surface The graphene unit is circular; the electromagnetic wave is vertically input to the graphene array, and then vertically output after passing through the graphene array on the upper surface, the insulating ...

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Abstract

The invention discloses a terahertz switch and a control method based on a periodic graphene structure absorption characteristic. According to the invention, a multilayer graphene array is adopted, and the multilayer graphene array is provided with different resonance absorption peaks, so that wider absorption bandwidth is obtained; the resonance absorption frequency of the graphene array is adjusted by changing a bias voltage, thereby controlling the on-off of the corresponding frequency of the output wave and realizing the switching function; due to the high electron mobility characteristicof the graphene, the switch has a faster switching speed; the ON / OFF state of the switch is switched by adopting an electric tuning mode, and the switch is simple in operation and low in energy consumption; the switch works in the terahertz frequency band, the application range of the terahertz device is widened; By changing the effective length of the graphene unit of the graphene array, the terahertz switch is suitable for the input wave and the output wave which are terahertz wave, microwave, infrared or visible light.

Description

technical field [0001] The invention relates to a terahertz switch, in particular to a terahertz switch and a control method based on the absorption characteristics of a periodic graphene structure. Background technique [0002] As a channel switching device, an optical switch plays an important role in an optical communication network. The principle of the traditional optical switch is mainly to use the change of the refractive index of the material, and realize it by designing structures such as Y branch, Mach-Zehnder (Mach-Zehnder) structure and directional coupler. With the increase of the amount of information, the switching speed of traditional optical switches has gradually been unable to meet the demand, and there is an urgent need for new optical switches with faster switching speeds. In recent years, graphene has been extensively studied as a novel two-dimensional material with favorable optoelectronic properties. Graphene has high carrier mobility, which provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01
CPCG02F1/0102
Inventor 刘江雨黄铁军刘濮鲲
Owner PEKING UNIV
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