Electro-optical modulator based on metal-medium-metal waveguide

An electro-optic modulator and metal technology, which is applied in instruments, optics, nonlinear optics, etc., can solve the problem that the metal-dielectric-metal waveguide mode cannot be adjusted

Inactive Publication Date: 2020-03-27
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an electro-optic modulator based on metal-dielectric-metal waveguide to solve the problem that the metal-dielectric-metal waveguide mode cannot be adjusted

Method used

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  • Electro-optical modulator based on metal-medium-metal waveguide
  • Electro-optical modulator based on metal-medium-metal waveguide
  • Electro-optical modulator based on metal-medium-metal waveguide

Examples

Experimental program
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Embodiment 1

[0028] figure 1 It is a schematic diagram of an electro-optic modulator based on a metal-dielectric-metal waveguide Figure 1 . figure 1 A cross-sectional view of the waveguide. Such as figure 1 As shown, the waveguide includes a substrate 1 , a first metal block 2 , a second metal block 3 , an electrode 4 , and an electro-optic crystal 5 . Wherein, the substrate 1 is made of silicon dioxide material, the first metal block 2 and the second metal block 3 are made of gold material, the electro-optic crystal 5 is any one of zinc sulfide, copper carbide, gallium arsenide, and gallium phosphide, and the electrode 4. Connect the first metal block 2 and the second metal block 3. As a metal-dielectric-metal waveguide, the energy of electromagnetic waves is mainly concentrated in the dielectric layer between the first metal block 2 and the second metal block 3. The waveguide has the characteristics of small mode area and less susceptible to external influence on propagation charact...

Embodiment 2

[0032] image 3 It is another schematic diagram of an electro-optic modulator based on a metal-dielectric-metal waveguide Figure II . On the basis of Example 1, such as image 3 As shown, the number of electro-optic crystals 5 is two, and the two electro-optic crystals 5 are in contact with the first metal block 2 and the second metal block 3 respectively. At this time, the electric field will be concentrated in a small area between the two electro-optic crystals 5, reducing the mode area of ​​the waveguide. When the refractive index of the electro-optic crystal 5 changes, the change of the effective refractive index of the waveguide is larger, that is, the adjustment range is larger.

[0033] Figure 4 is at different refractive indices of electro-optic crystals, image 3 Electric field distribution diagram of the metal-dielectric-metal waveguide section shown. Figure 4 a is the electric field distribution diagram when the refractive index of the electro-optic crystal...

Embodiment 3

[0036] Figure 5 It is a schematic diagram of another electro-optic modulator based on metal-dielectric-metal waveguide Figure three . On the basis of Example 2, such as Figure 5 As shown, the bottoms of the two electro-optic crystals 5 are also provided with communication parts. In this way, the two electro-optic crystals 5 are connected through the communication part. The connected electro-optic crystal 5 and the substrate form an enclosing area, where electromagnetic waves are gathered to form a confinement area for electromagnetic waves, further reducing the mode area of ​​the waveguide. When the refractive index of the electro-optic crystal 5 changes, the change of the effective refractive index of the waveguide is larger, that is, the adjustment range is larger.

[0037] Figure 6 is at different refractive indices of electro-optic crystals, Figure 5 Electric field distribution diagram of the metal-dielectric-metal waveguide section shown. Figure 6 a is the el...

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Abstract

The invention provides an electro-optical modulator based on a metal-medium-metal waveguide. The electro-optical modulator comprises a substrate, a first metal block, a second metal block, an electro-optic crystal and an electrode, the electro-optical crystal is arranged in the metal-medium-metal waveguide; after the electrodes are powered on, an external electric field is applied to the metal-medium-metal waveguide, the refractive index of the electro-optical crystal is changed, that is, the refractive index between the first metal block and the second metal block is changed, so that the propagation characteristic of the metal-medium-metal waveguide is changed, and modulation of an electromagnetic wave propagation mode is completed. The optical waveguide does not need to be made into an electro-optical material, and the manufacturing cost is low; in addition, the positions and the number of the electro-optical crystals are flexible, and modulation of a specific light wave mode can beachieved according to the positions and the number of the electro-optical crystals.

Description

technical field [0001] The invention relates to the field of optical modulators, in particular to an electro-optic modulator based on a metal-dielectric-metal waveguide. Background technique [0002] The electro-optic modulator is a modulator made by using the electro-optic effect of certain crystals, and is an important device in optical communication and microwave photonic technology. According to the relationship between the refractive index change of the electro-optic crystal and the applied electric field strength, the electro-optic effect can be divided into a linear electro-optic effect (Pockels effect) and a secondary electro-optic effect (Kerr effect). Because the linear electro-optic effect is more effective than the secondary electro-optic effect, in practice, a linear electro-optic modulator is often used to modulate the light wave. [0003] However, traditional electro-optic modulators, such as M-Z interferometric modulators, directly make optical waveguides in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/035G02F1/03
CPCG02F1/0305G02F1/035
Inventor 解宜原宋婷婷叶逸琛刘波成柴俊雄朱云超江潇
Owner SOUTHWEST UNIVERSITY
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