A dual-controlled, broadband terahertz wave absorber based on Dirac semimetals and water
A semi-metallic and terahertz technology, applied in the field of terahertz metamaterial wave absorption, can solve the problems of narrow working bandwidth, narrow application range, difficult manufacturing and processing, etc., and achieve the effect of improving the absorption bandwidth
Active Publication Date: 2021-12-28
CHONGQING UNIV
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Problems solved by technology
However, there are two disadvantages that greatly hinder their practical applications
One disadvantage is that most of the studied absorbers are based on metallic structures with relatively narrow operating bandwidths
Although the broadband absorber designed by this method has made great progress in ideal absorption, it is difficult to manufacture and process, and it is difficult to integrate into actively controllable systems
Another disadvantage is that the bandwidth and intensity of the absorption spectrum remain unchanged when preparing the absorber
For some of the tunable absorbers that have been designed, the disadvantage is that the adjustable factor is single and the application range is narrow
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[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0024] Such as figure 1 As shown, the present invention discloses a dual-controlled, broadband terahertz wave absorber based on Dirac semi-metal and water. The dual-controlled, broadband terahertz wave absorber includes a plurality of absorbing units, and each absorbing unit From bottom to top, there are metal layer, dielectric layer and Dirac semi-metal pattern layer, and the dielectric layer is filled with water.
[0025] In recent years, Dirac semimetals, as a new quantum state substance, have aroused great interest of researchers due to their dual characteristics in the terahertz frequency range. Dirac semimetals have dual characteristics of metal and dielectric. When the operating frequency is lower than the Fermi level, the metallic nature is more obvious, while at higher frequencies, the dielectric response dominates. Furthermore, since the dielectri...
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Abstract
The invention discloses a dual-control, broadband terahertz wave absorber based on Dirac semi-metal and water. The dual-control, broadband terahertz wave absorber array includes a plurality of wave-absorbing units, and each wave-absorbing unit consists of the following The metal layer, the dielectric layer and the Dirac semi-metal pattern layer are in sequence on top, and the dielectric layer is filled with water. In the present invention, the absorption bandwidth and absorption intensity of the absorber can be changed by adjusting the Fermi energy level of the Dirac semimetal or the temperature of water. After parameter optimization and calculation, it is obtained that the absorption rate of the proposed absorber is greater than 90% in the frequency range of 3.05-6.35THz, and the absorption bandwidth can reach 3.3THz. Compared with existing absorbers, the absorption bandwidth of the designed device is significantly improved by more than 90%. The characteristic of the absorber is that its performance can be adjusted by temperature control and electric control.
Description
technical field [0001] The invention relates to the field of terahertz metamaterial wave absorption, in particular to a dual-control and broadband terahertz wave absorber based on Dirac semimetal and water. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency band ranging from 0.1 to 10 THz. In recent decades, due to its wide application in biomedical imaging, sixth generation wireless communication, safety detection and other engineering fields, it has attracted great attention. Terahertz metamaterial absorbers are currently one of the hottest research branches due to their wide range of applications. A typical metamaterial absorber usually consists of a resonant cavity composed of a periodic metal pattern, a dielectric layer, and a bottom metal ground plate. However, there are two drawbacks that greatly hinder their practical application. One disadvantage is that most of the studied absorbers are based on metallic structures with...
Claims
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IPC IPC(8): H01Q17/00
CPCH01Q17/00H01Q17/007
Inventor 熊汉申琪罗超鸣
Owner CHONGQING UNIV