Graphene material-based adjustable terahertz waveguide device
A waveguide device and tunable technology, applied in the field of terahertz waveguide devices, can solve the problems of restricting the development of terahertz waveguide devices, loss, and the properties of the waveguide can no longer be adjusted, and achieve large-scale integration, simple and compact structure. Effect
Inactive Publication Date: 2017-09-08
CHINA JILIANG UNIV
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Problems solved by technology
Although these waveguide structures can transmit surface waves, artificial surface plasmon waveguides can only transmit short distances due to the relatively large loss of metals for terahertz waves, and the confinement of these waveguides is also very poor, which is in the waveguide. When splitting or bending, it brings a lot of loss
Another point is that once the terahertz waveguide structure of metal materials is fixed, the properties of the waveguide can no longer be adjusted.
This also limits the development of terahertz waveguide devices to a certain extent.
Method used
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Embodiment 1
[0022] attached figure 1 This is a schematic diagram of the structure of the waveguide device. The silicon dioxide substrate layer 1 is superimposed with a graphene layer 2 with a thickness of only 0.34 nm, the upper layer is superimposed with a silicon dioxide layer 3 with a thickness of t, and the top layer is a metal strip with a width of w The top layer 4 is placed on the silicon dioxide crystal thereby constituting a three-layer waveguide structure. The terahertz beam is incident on the structure along the z-direction. When the top layer 4 of the strip adopts metal copper material, such a metal copper-silicon dioxide-graphene three-layer structure is similar to the metal-dielectric-metal type structure in the optical band, but the difference is that our proposed The plasmonic mode of the structure should be regarded as the PEC-medium-plasmonic mode in the y direction, not really our MIM mode in the optical band, because there is only one plasmon at the interface between...
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Abstract
The present invention discloses a graphene material-based adjustable terahertz waveguide device. According to the structure of the device, a silicon dioxide material substrate layer, a graphene layer, a silicon dioxide intermediate layer and a metal copper strip are overlapped from bottom to top to form a three-layer waveguide structure and the three-layer waveguide structure is placed on a silicon dioxide substrate. The three-layer waveguide structure realizes surface plasmas based on graphene within the terahertz wave band. A reasonable antenna structure is designed through the finite element method-based simulation and calculation process. The effective refractive index of the structure is calculated based on the mode analysis method. Furthermore, terahertz waves of the above structure are strong in confining ability and controllable in transmission loss. The graphene material-based adjustable terahertz waveguide device has the advantages of simple structure, convenient processing, strong confining ability, easy adjustment and the like. Therefore, the graphene material-based adjustable terahertz waveguide device can widely meet application requirements in the terahertz absorption aspect.
Description
technical field [0001] The invention relates to a highly constrained and easily adjustable terahertz waveguide device based on graphene material as a surface plasmon material, and belongs to the application field of graphene material in terahertz band. Background technique [0002] Terahertz waves are located between microwaves and infrared light in the electromagnetic spectrum, with wavelengths usually ranging from 30 μm to 3 mm. Due to their wide range of potential applications in various fields, including communications, sensing, and biological imaging, they have been favored by people in recent years. attention and research. However, with the rapid development of terahertz technology applications, the application of waveguides in communications is an indispensable device. Although most waveguides of metallic materials can be obtained by digging holes or grooves in the terahertz band, these waveguides have very low confinement capabilities and short transmission distance...
Claims
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Login to View More IPC IPC(8): G02B6/10G02B5/00
CPCG02B5/008G02B6/10
Inventor 肖丙刚秦康
Owner CHINA JILIANG UNIV