Graphene material-based efficient and adjustable terahertz wave absorption device
A graphene, layer graphene technology, applied in electrical components, antennas, etc., can solve the problems of limited surface plasmon application, large surface plasmon of the imaginary part of the dielectric constant, and difficulty in achieving tunability, etc. The effect of scale integration, simple and compact structure, and efficient absorption
Inactive Publication Date: 2017-09-08
CHINA JILIANG UNIV
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Problems solved by technology
Although these metamaterial structure absorbing devices can achieve high-efficiency absorption, if the metal metamaterial structure is to achieve adjustable absorbing properties, only the geometric parameters of the material can be changed. However, once the structure of these metamaterials is fixed in the experiment, it will Difficult to achieve adjustability
At present, there have been researches on the use of metal surface plasmon nanostructures in the optical band to improve the light absorption efficiency and improve the performance of thin-film photovoltaic devices, but in the terahertz band due to the dielectric constant of metals that are commonly used surface plasmon materials The imaginary part is too large to directly support surface plasmons, which also limits the application of surface plasmons in terahertz absorbing
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[0023] attached figure 1 It is a schematic diagram of the structural unit of the absorbing device. A layer of silicon dioxide with a thickness of h is superimposed on the metal reflective substrate layer 1 with a period of P as the substrate layer 2, a layer of graphene layer 3 with a thickness of 0.34 nm is superimposed on the upper layer, and a layer of graphene layer 3 with a thickness of t is superimposed on the upper layer. The silicon oxide intermediate layer 4 is stacked with a strip layer 5 with a width w and a thickness d on the uppermost layer to form a five-layer structure. The terahertz beam is vertically incident on the structure, and since the substrate layer 1 is opaque to the terahertz radiation, it can be seen that the absorption rate of the structure is only related to the reflectance of the structure. When the middle layer 3 adopts graphene material, such a graphene-silicon dioxide-metal three-layer structure is similar to the metal-medium-metal structure i...
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Abstract
The invention discloses a high-efficiency and adjustable terahertz wave-absorbing device based on graphene materials. The device consists of a reflective base layer of metal copper material, a silicon dioxide A one-dimensional periodic five-layer structure formed by stacking the middle layer of silicon dioxide and the top layer of a metal strip from bottom to top. The wave-absorbing device is based on the surface plasmon material of graphene in the terahertz band. Through the simulation calculation of the finite element method, a reasonable antenna structure is designed. By observing the absorption spectrum of the structure for the incident terahertz signal, the terahertz wave is realized. Efficient absorption. It has a simple structure, is easy to process, and has high absorption efficiency. Due to the properties of graphene, the absorber is also easily adjustable, which can widely meet the requirements for terahertz absorption applications.
Description
technical field [0001] The invention relates to a high-efficiency and adjustable terahertz wave-absorbing device based on graphene material as a surface plasmon material, and belongs to the application field of graphene material in the terahertz wave band. Background technique [0002] Terahertz waves are located between microwave and infrared light in the electromagnetic spectrum, with wavelengths from 30 μm to 3 mm. Due to their wide application in various fields, including biosensing, imaging, medical treatment, communication, etc., they have been attracted by people in recent years. Follow and research. However, with the rapid development of the application of terahertz technology, it is necessary to avoid the influence of terahertz radiation in some special cases. Although most media are somewhat lossy to terahertz radiation, none of them can completely absorb terahertz waves over very short distances. Therefore, there is an increasing demand for high-efficiency terah...
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Login to View More IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor 肖丙刚秦康
Owner CHINA JILIANG UNIV