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Electrooptical modulator based on graphene

An electro-optic modulator and single-layer graphite technology, which is applied in the fields of instruments, optics, nonlinear optics, etc., can solve problems such as difficult structural design, complexity, and expansion of the frequency range of electro-optic modulators, and achieve good structural parameter tolerance and modulation The effect of depth enhancement

Active Publication Date: 2019-02-22
TAIZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, one drawback to the way this formant shift works is that the photodetector will more or less always have a response in one frequency range, so if the formant frequency is shifted over a range smaller than the photodetector's frequency response range, then the output signal of the photodetector will have no change
This will lose some of the potential of the electro-optic modulator switching ratio
In order to solve this defect, the frequency shift range of the electro-optic modulator must be expanded, which requires complex and difficult structural design; or a laser signal light source with excellent monochromaticity can be used instead of an LED signal light source, which will increase the frequency of the electro-optic modulator. the cost of

Method used

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  • Electrooptical modulator based on graphene
  • Electrooptical modulator based on graphene

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Embodiment 1

[0030] In this embodiment, the proposed novel electro-optic modulator based on graphene is described as follows: the metal material is selected as aluminum, the substrate material is selected as silicon, and the coupling layer material is selected as silicon dioxide; its structural parameters, such as figure 1 As shown, L is equal to 1.6 micrometers, g is equal to 40 nanometers, P is equal to 1.8 micrometers, tm is equal to 50 nanometers, and td is 350 nanometers. Unless otherwise specified, in other embodiments, the materials in this embodiment are used. Unless otherwise specified, in other embodiments, the structural parameters all adopt the parameters in this embodiment.

Embodiment 2

[0032] In this embodiment, L is equal to 1.5 microns.

Embodiment 3

[0034] In this embodiment, L is equal to 1.8 microns.

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Abstract

The invention discloses an electrooptical modulator based on graphene. The electrooptical modulator comprises a substrate, a magnetic resonance plasmon metasurface and a single-layer graphene sheet. By means of the electrooptical modulator, the Fermi level of the single-layer graphene sheet can be changed so that the transmissivity of middle infrared light which transmits through the electrooptical modulator can be changed, and it is guaranteed that the position of the transmission peak on the spectrum cannot be changed.

Description

technical field [0001] The invention relates to the field of electro-optic modulation devices, in particular to a graphene-based electro-optic modulator applied in free space and working in the mid-infrared band. technical background [0002] The modulation of light is the cornerstone of realizing display, integrated optical circuit, optical information transmission, optical information processing and many other applications using light as the basic medium, and occupies an important position in the field of optics research. The electromagnetic nature of light endows light with many properties for carrying information, such as frequency, phase, polarization, and spin. However, the most immediate and widely used property for carrying information is amplitude, or intensity. Traditional light modulation devices require a working medium, such as various liquid crystals, acousto-optic crystals, etc. These traditional working media are generally bulk materials, which leads to the...

Claims

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Application Information

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IPC IPC(8): G02F1/03
CPCG02F1/0305G02F1/0327G02F2203/12
Inventor 王宗鹏申士杰钟文武林志萍
Owner TAIZHOU UNIV
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