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A Broadband Circular Dichroic Chiral Absorber in the Microwave Range

A technology of circular dichroism and microwave segment, which is applied in the field of broadband circular dichroic chiral absorber in the microwave segment, which can solve the problems of narrow bandwidth, difficult detection, inconvenient device integration, etc.

Active Publication Date: 2021-07-06
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the wave absorber based on the chiral structure still faces the following bottlenecks: First, the circular dichroism value of the existing wave absorber is small, and the bandwidth is narrow, which is difficult to be detected in the experimental measurement, especially in the In the application of biosensing; secondly, most of the existing chiral absorbers adopt multi-layer stacked complex structures, which are expensive to manufacture and not easy to integrate devices, which greatly limits their practical application range

Method used

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  • A Broadband Circular Dichroic Chiral Absorber in the Microwave Range
  • A Broadband Circular Dichroic Chiral Absorber in the Microwave Range
  • A Broadband Circular Dichroic Chiral Absorber in the Microwave Range

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Experimental program
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Embodiment 1

[0027] The microwave section broadband circular dichroic chiral absorber of embodiment one, such as Figure 1 to Figure 5 As shown, it includes the underlying metal thin film 1, the first lossy dielectric layer 2, the air layer 3, the asymmetric structure metal thin film layer 4 and the second lossy dielectric layer 5 arranged in sequence. In this embodiment, the first lossy dielectric layer 2 and the second lossy dielectric layer 5 are both F4B dielectric layers, the underlying metal film 1 is attached to the first lossy dielectric layer 2, the asymmetric structure metal film layer 4 includes nine asymmetric structure metal films 40, and nine asymmetric structure metal films Thin films 40 are periodically arranged on the second lossy dielectric layer 5, and each metal thin film 40 with asymmetric structure is attached to the second lossy dielectric layer 5 in an asymmetric pattern, and each metal thin film 40 with asymmetric structure is provided with a second A fracture 41, ...

Embodiment 2

[0030] The broadband circular dichroic chiral wave absorber in the microwave section of the second embodiment has the same structure as that of the first embodiment, the only difference is that the values ​​of some size parameters are different, specifically, in this embodiment, the word "口" The length a of the top side of the pattern is 12.0mm, the length b of the left side is 12.6mm, and the length e of the bottom side of the "mouth" shaped pattern located on the right side of the second fracture 42 is 5.85mm, including the first fracture 41. The length c of the right side including the height is 11.6 mm.

[0031] Figure 6 The simulation curves of the reflectivity of the wave absorbers of Embodiment 1 and Embodiment 2 are given when circularly polarized waves are incident along the +z direction. From Figure 6 It can be seen that when the operating frequency range is 4.3-7.9 GHz, the reflectivity of the left-handed circularly polarized LCP wave of the absorber in the firs...

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Abstract

The invention discloses a microwave segment broadband circular dichroic chiral wave absorber, which comprises a bottom metal film, a first loss medium layer, an air layer, an asymmetric structure metal film layer and a second loss medium layer arranged in sequence, The underlying metal film is attached to the first lossy dielectric layer, and the asymmetric structure metal film layer includes multiple asymmetric structure metal films, and the multiple asymmetric structure metal films are periodically arranged on the second loss medium layer, each asymmetric structure The structural metal film is attached to the second lossy dielectric layer in an asymmetrical pattern, and each asymmetrical structural metal film is provided with a first fracture, and the first fracture is loaded with a resistor, and the air layer is arranged between the first lossy dielectric layer and the non-conductive dielectric layer. Between the metal thin film layers with symmetrical structure, the first loss medium layer and the metal thin film layer with asymmetric structure are separated by an air layer. The chiral wave absorber has high-efficiency absorption characteristics of broadband left-handed circularly polarized waves, strong broadband absorption circular dichroism characteristics and frequency tunable characteristics in the microwave section.

Description

technical field [0001] The invention relates to a wave absorber, in particular to a microwave section broadband circular dichroic chiral wave absorber. Background technique [0002] Circular dichroism is defined as the differential absorption of left-handed circularly polarized LCP waves and right-handed circularly polarized RCP waves, which widely exist in nature, such as chiral structures such as DNA, viruses, and protein molecules. , photocurrent devices and photocatalysis and other fields have a wide range of applications. [0003] The traditional method of realizing strong circular dichroism is mainly based on the helical ring structure and its deformation structure, but these structures are complex three-dimensional structures, which are cumbersome to manufacture and not easy for system integration. In 2014, based on double-layer printed circuit board technology (Journal of Physics D: Applied Physics, 47(18): 185102, 2014), with metal vias, Li et al achieved 93.2% lef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00
CPCH01Q17/00H01Q17/007H01Q17/008
Inventor 时胜圆李敏华易泽鑫宋友婷高文涛
Owner NINGBO UNIV