Metasurface with dual functions of circular polarized wave asymmetric transmission and unidirectional wave absorption
An asymmetric transmission, circularly polarized wave technology, applied in the terahertz field, can solve the problems of single terahertz metasurface function, low efficiency of circularly polarized wave asymmetric transmission, etc., to achieve the effect of flexible conversion
Active Publication Date: 2022-07-05
XIDIAN UNIV
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Problems solved by technology
[0006]
The purpose of the present invention is to address the deficiencies in the prior art above, to propose a metasurface with dual functions of circularly polarized wave asymmetric transmission and one-way absorption, aiming to use a structure to realize circularly polarized wave asymmetric transmission and Two functions of absorbing waves are used to solve the technical problems in the prior art that the terahertz metasurface has a single function and the asymmetric transmission efficiency of circularly polarized waves is low
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[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] refer to figure 1 , the present invention includes a first dielectric substrate 1, a second dielectric substrate 2 and a third dielectric substrate 3, which are arranged in sequence from top to bottom and are not in contact with each other. The upper surfaces of the first, second and third dielectric substrates are respectively printed on There are N×N resonant units 4 periodically arranged, and the metal resonator unit 4 adopts a chiral metal structure, including L-shaped metal patches and quasi-C-shaped metal patches whose longitudinal sides and bottom sides are oppositely arranged. The lengths of the two sides of the C-type metal patch are unequal; the lower surfaces of the first dielectric substrate 1 and the second dielectric substrate 2 are respectively printed with a square first graphene patch at the position directly bel...
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The metasurface is used for solving the problems that an existing asymmetric transmission metasurface is single in function and low in circularly polarized wave regulation and control efficiency, and comprises three layers of dielectric substrates which are sequentially arranged from top to bottom and do not make contact with one another. The upper surfaces of the three dielectric substrates are respectively printed with L-shaped and quasi-C-shaped metal resonance units which are periodically arranged, the longitudinal edges of the two metal patches are unequal in length, and the transverse edges of the two metal patches are opposite to each other; graphene patches are printed on the lower surfaces of the first dielectric substrate and the second dielectric substrate respectively, and a graphene floor is printed on the lower surface of the third dielectric substrate; in the process that the Fermi level of graphene is increased from 0 eV to 0.8 eV, the function of the metasurface is gradually converted from asymmetric transmission of circular polarization to perfect wave absorption. According to the invention, flexible conversion between circular polarization asymmetric transmission and wave absorbing functions can be realized by using the metasurface structure, and the metasurface structure can be used for radar detection and wireless communication systems such as intelligent radomes and the like.
Description
technical field [0001] The invention belongs to the technical field of terahertz, and relates to a metasurface with dual functions of circularly polarized wave asymmetric transmission and unidirectional wave absorption, which can be used in the field of asymmetric transmission and electromagnetic absorption of circularly polarized electromagnetic waves in the terahertz frequency band. Background technique [0002] Graphene metasurfaces have been widely used in the field of asymmetric transmission due to their efficient polarization conversion properties, which can make electromagnetic waves incident from both positive and negative directions produce different electromagnetic transmission effects. At the same time, because the circularly polarized wave has the characteristics of strong anti-interference and easy reception, the technology of using metasurfaces to control the circularly polarized terahertz wave has a very broad application prospect. The tunable effect of graphe...
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IPC IPC(8): H01Q15/00H01Q15/24H01Q17/00
CPCH01Q15/0086H01Q17/008H01Q15/0026H01Q15/242Y02D30/70
Inventor 杨锐王燕飞张山芳
Owner XIDIAN UNIV
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