Water-based interlayer metasurface adjustable coherent wave absorber

A wave absorber and metasurface technology, applied in the field of electromagnetic waves, can solve the problems of complex overall structure, high cost, immature production process, etc., and achieve the effect of simple overall structure, low manufacturing cost, and improved controllability.

Active Publication Date: 2021-09-03
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the research process, the inventors of this application noticed that most of the existing coherent absorbers can only realize the adjustable absorption rate at a fixed absorption peak frequency, lack of real-time adjustment of the absorption peak frequency, or It is an adjustable coherent perfect absorber equipped with a bias circuit made of graphene and other materials, but the production process is immature, the manufacturing cost is high, the structure is complicated, and a special control circuit needs to be configured, or a liquid metal rod is used. The way of mechanical regulation, but the actual operation is complicated and the precision is not high
On the other hand, the research in the existing literature lacks the distinction and utilization of the absorption properties of coherent beams in different polarization states, which limits the application of coherent perfect absorbers in frequency filtering and polarization selective transparency.
[0005] The existing adjustable coherent perfect absorber or graphene material with adjustable electromagnetic parameters or mechanical adjustment method is used to adjust the absorption peak frequency. The overall structure is complex, the cost is high, the operation is cumbersome and the adjustment accuracy is not high.
The existing coherent perfect absorbers lack the distinction and utilization of the absorption performance of the incident coherent beams under different polarization states, that is, the absorption channels of most coherent absorbers for the incident coherent beams under different polarization states are coincident or irregular separation

Method used

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  • Water-based interlayer metasurface adjustable coherent wave absorber
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  • Water-based interlayer metasurface adjustable coherent wave absorber

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Effect test

Embodiment 1

[0026] Since the concept of the coherent perfect absorber was proposed, the coherent perfect absorber with adjustable absorption peak intensity provides a new solution for the study of the tunability of the traditional electromagnetic absorber, that is, by adjusting the two beams The phase difference between coherent light realizes the dynamic control of the absorption intensity. During the research process, the applicant of the present invention noticed that most of the existing coherent absorbers can only realize the adjustable absorption rate at a fixed absorption peak frequency, lack of real-time adjustment to the absorption peak frequency, or use A tunable coherent perfect absorber equipped with a bias circuit made of expensive materials such as graphene. On the other hand, the research in the existing literature lacks the distinction and utilization of the absorption properties of coherent beams under different polarization states, which limits the application of coheren...

Embodiment 2

[0030]The overall composition of a water-based interlayer metasurface tunable coherent absorber is the same as in Embodiment 1, see figure 1 (c), figure 1 (c) is a schematic diagram of micro-unit structure decomposition, and the resonator metal pattern of the PCB board etched with the resonator metal pattern of the present invention is a split resonant ring 4 with double openings. see figure 1 (b), figure 1 (b) Schematic diagram of micro-units that are periodically arranged to form an overall structure. The double-opening split resonant ring of the present invention coincides with the plane geometric center of the PCB board. see figure 2 , figure 2 It is a structural schematic diagram of the double-split resonant ring unit 4 of the present invention. The double-split resonant ring of the present invention is distributed concentrically by the inner ring and the outer ring, and the inner ring is composed of two small-radius metal arc lines 13 and 14. The ring with two ope...

Embodiment 3

[0035] The overall composition of a water-based interlayer metasurface tunable coherent absorber is the same as in Embodiment 1-2, see figure 1 (b), the thickness T of the water material substrate 1 of the present invention 1 is 5.8 mm, the material is pure water, and its dielectric constant ε r (f,T) is temperature dependent according to the Debye model: dielectric constant where ε ∞ (T) is the high-frequency dielectric constant, ε s (T) is the dielectric constant at rest, and τ(T) refers to the relaxation time, and their values ​​are related to the temperature T (°C) of the water. The water is manipulated by adjusting the ambient temperature and controlling the wave phase. The interaction between the interlayer metasurface coherent absorber and the incident coherent electromagnetic wave realizes the dynamic control of its absorbing frequency and absorption rate.

[0036] As one of the most common materials in nature, water can be seen everywhere in life. W.J.Ellison pu...

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Abstract

The invention discloses a water-based interlayer metasurface adjustable coherent wave absorber. The water-based interlayer metasurface adjustable coherent wave absorberis of a novel structure and achieves real-time dynamic adjustment of frequency and amplitude of a coherent absorption peak and regulation and control of absorption channel regularity of incident coherent wave beams in different polarization states through low-cost materials. Micro-units are periodically arranged to form an overall structure of the water-based interlayer metasurface adjustable coherent wave absorber, each micro-unit is of a sandwich structure formed by a PCB substrate with double-opening split resonance ring metal patterns etched on the two sides, and a water intermediate dielectric layer, and the water layer and the substrate are equal in length and width. By adjusting the relative orientation of the openings of the resonant rings on the two sides of each micro-unit, complete coincidence and separation of incident coherent wave absorption channels in different polarization states are achieved, and the method has important application value in frequency filtering and polarization selective permeability. By changing the phase difference between the water temperature and the incident coherent wave beam, the wave absorbing characteristics such as the absorption frequency point and the absorption rate can be dynamically regulated and controlled in real time, and the regulation and control capability of the coherent wave absorber is improved.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave technology, and mainly relates to new artificial electromagnetic materials and electromagnetic wave regulation, specifically a new structure of a water-based interlayer supersurface adjustable coherent absorber, which can be used for all-optical switches, main control stealth, electromagnetic modulation, etc. . [0002] technical background [0003] The strong dynamic adjustable ability of coherent perfect absorber makes it have important research and application value in all-optical switch, electromagnetic modulation, detector, sensor, master control stealth, etc. It has a time-reversal symmetric relationship with well-known lasers, and coherent wave absorption can achieve complete absorption of electromagnetic wave energy by utilizing the interference between two beams of coherent light incident symmetrically in opposite directions. In 2010, the coherent perfect absorber originally designed b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00H01Q17/00
CPCH01Q15/0086H01Q17/007
Inventor 杨锐王远光顾宸光郭海琼
Owner XIDIAN UNIV
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