Three-layer circular inner and outer double resonant cavity broadband terahertz wave metasurface absorber
A double resonant cavity and surface absorption technology, which is applied in the field of absorbers, can solve the problems of narrow working frequency band, difficult processing, and low absorption rate, and achieve the effects of ultra-broadband absorption and easy, simple structure, and small size
Pending Publication Date: 2021-06-04
中检质技检验检测科学研究院有限公司 +1
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Problems solved by technology
[0003] Absorbers are one of the most important directions in the development of terahertz applications. However, existing terahertz absorber designs generally have problems such as narrow operating frequency band, thick structure, low absorption rate, and difficult processing.
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Embodiment 1
[0017] Three-layer circular inner and outer double resonant cavity broadband terahertz wave metasurface absorber:
[0018] In this embodiment, the structure based on the terahertz absorber and the shape of each component are as described above, so details are not repeated here. However, the specific parameters of each component are as follows: the metal copper layer is located at the bottom layer, covered with a thin layer of silicon, and the top layer is a three-layer dielectric metal structure. The ground layer is metallic copper, the unit size is 300×300 μm, and the thickness t=18 μm. The substrate adopts a silicon layer with high purity, 300×300 μm, and the thickness a=3 μm. The dielectric material is the most commonly used polyimide material, the dielectric constant ε r =3.5, thickness h=8μm. Taking the lowest layer of geometric metal as a reference, the surface size of the middle layer and the lower layer are scaled by 0.8 times and 0.6 times respectively, and the thi...
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The invention discloses a three-layer double-resonance broadband terahertz wave absorber. The filter comprises a bottom metal copper layer, substrate silicon and three layers of metal media which are arranged in an overlapped manner, wherein the metal copper layer is located at the bottommost layer and is covered with thin-layer silicon, the uppermost layer is of a three-layer metal medium stacking structure, compared with other terahertz absorbers, the metasurface structure is achieved by changing the angle of a surface metal ring, the bandwidth is further expanded through the design of an internal resonant cavity, the three-layer structure better absorbs external energy and ensures the minimum thickness to realize the maximum absorption benefit, and each layer of diagonal ring adopts a symmetrical design, so that the stability of the function of the absorber is ensured. From the perspective of design, the number of layers of the metasurface absorber in the traditional design is reduced. The three-layer double-resonance broadband terahertz wave absorber has the advantages of simple structure, broadband absorption, easiness in processing and implementation and the like.
Description
technical field [0001] The absorber of the present invention particularly relates to a three-layer circular inner and outer double resonant cavity broadband terahertz wave metasurface absorber. Background technique [0002] The terahertz band refers to electromagnetic waves with a frequency between 0.1 and 10 THz (wavelength between 30 μm and 3 mm). Its low energy, high penetration, fingerprint spectrum, broadband, transient and coherent properties are often used in biomedical imaging, security inspection, radar, astronomy, communication technology, non-destructive testing and other fields. Since terahertz is between the microwave band and the infrared band in the electromagnetic wave band, it has some characteristics of both microwave and light waves, but it cannot fully apply low-frequency or high-frequency theories. Although there are not many substances that can respond to terahertz in nature, resulting in fewer applications of terahertz, the emergence of electromagneti...
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Login to View More IPC IPC(8): H01Q15/00H01Q17/00
CPCH01Q15/0086H01Q17/00
Inventor 楼英超陈彭徐亮林婷艳方波魏益松王佳赛王铭阳丁玉林
Owner 中检质技检验检测科学研究院有限公司