Terahertz modulator adopting graphene metal composite structure

A metal composite structure, metal structure technology, applied in the direction of instrument, nonlinear optics, optics, etc., can solve the problems of limited modulation speed of diode modulation speed, limited modulation ability of single-layer graphene thickness, etc., to achieve enhanced interaction, The effect of large modulation depth and high modulation rate

Inactive Publication Date: 2016-12-07
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing terahertz modulators include two types, one is only composed of graphene film or graphene structure, this type of modulator can achieve fast modulation, but the modulation capability is limited by the thickness of a single layer of graphene
The other is to use a metal sub-wavelength structure combined with a controllable diode capacitance and inductance. The modulation depth is large and the effect is remarkable, but the modulation speed is limited by the modulation speed of the diode itself.

Method used

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  • Terahertz modulator adopting graphene metal composite structure
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  • Terahertz modulator adopting graphene metal composite structure

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A terahertz modulator with a graphene-metal composite structure, the structure of which is shown in figure 1 As shown, the structural features are as follows:

[0031] (1) The modulator structure is made of substrate 11, metal structure layer 12, insulating medium layer 13, graphene film layer 15 and electrode 14;

[0032] (2) The metal structure layer 12 is composed of a sub-wavelength array structure, attached above the surface of the substrate 11, and its structural unit is a square metal frame 1 as a whole, the four sides of the square metal frame 1 are equal in width, and there is a square metal frame 1 in the middle The square metal patch 3, the hollow area 2 between the square metal patch 3 and the square metal frame 1, the hollow area 2 is also in the shape of a square frame, the structural units are arranged in a rectangular array, and the square metal frames 1 of the structural units are connected to form a One piece; the schematic diagram of the structural u...

Embodiment 2

[0044] A terahertz modulator with a graphene-metal composite structure, the structure of which is shown in figure 1 As shown, the structural features are as follows:

[0045] (1) The modulator structure is made of substrate 11, metal structure layer 12, insulating medium layer 13, graphene film layer 15 and electrode 14;

[0046](2) The metal structure layer 12 is composed of a sub-wavelength array structure, attached above the surface of the substrate 11, and its structural unit is a square metal frame 1 as a whole, the four sides of the square metal frame 1 are equal in width, and there is a square metal frame 1 in the middle The square metal patch 3, the hollow area 2 between the square metal patch 3 and the square metal frame 1, the hollow area 2 is also in the shape of a square frame, the structural units are arranged in a rectangular array, and the square metal frames 1 of the structural units are connected to form a One piece; the schematic diagram of the structural un...

Embodiment 3

[0059] A terahertz modulator with a graphene-metal composite structure, the structure of which is shown in figure 1 As shown, the structural features are as follows:

[0060] (1) The modulator structure is made of substrate 11, metal structure layer 12, insulating medium layer 13, graphene film layer 15 and electrode 14;

[0061] (2) The metal structure layer 12 is composed of a sub-wavelength array structure, attached above the surface of the substrate 11, and its structural unit is a square metal frame 1 as a whole, the four sides of the square metal frame 1 are equal in width, and there is a square metal frame 1 in the middle The square metal patch 3, the hollow area 2 between the square metal patch 3 and the square metal frame 1, the hollow area 2 is also in the shape of a square frame, the structural units are arranged in a rectangular array, and the square metal frames 1 of the structural units are connected to form a One piece; the schematic diagram of the structural u...

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Abstract

The invention provides a terahertz modulator adopting a graphene metal composite structure. The terahertz modulator consists of a substrate, a metal structure layer, an insulating dielectric layer, a graphene film layer and an electrode. The terahertz modulator applies voltage between the metal structure layer and the electrode to change the chemical potential of graphene, so as to modulate terahertz wave energy penetrating through a device; in addition, through the resonant interaction of the metal structure layer in a specific terahertz wave band, the modulation depth of the device in the resonant wave band is improved. According to the terahertz modulator, the high electron mobility property of the graphene and the resonant property of the metal structure are combined to obtain the terahertz modulator with high speed and large modulation depth, and the terahertz modulator can be widely applied to the fields of terahertz communication, terahertz detection, terahertz imaging and the like.

Description

technical field [0001] The invention relates to a terahertz modulator, which belongs to the field of terahertz modulators with a graphene-metal composite structure. Background technique [0002] Graphene is a two-dimensional material composed of a layer of carbon atoms. Its Fermi energy level changes with the change of bias voltage, which causes the change of graphene conductivity, and the electron mobility of graphene is very high. Realizing the high-speed injection and extraction of carriers is an ideal material for high-speed modulators. However, graphene is composed of a single layer of atoms, and its ability to act on electromagnetic waves is limited, resulting in a low modulation depth. Metamaterials composed of subwavelength structures break through the limitations of some apparent natural laws through the design of various physical structures, so as to obtain extraordinary material functions. For example, its resonance characteristics can localize electromagnetic wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/00
CPCG02F1/00G02F2203/13
Inventor 夏良平张欣魏东山崔洪亮杜春雷
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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