A water-based interlayer metasurface tunable coherent absorber

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

Active Publication Date: 2022-07-12
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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  • A water-based interlayer metasurface tunable coherent absorber
  • A water-based interlayer metasurface tunable coherent absorber
  • A water-based interlayer metasurface tunable coherent absorber

Examples

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Effect test

Embodiment 1

[0026] Since the concept of coherent perfect absorber was proposed, the coherent perfect absorber with tunable absorption peak intensity provides a new solution for the study of tunability of traditional electromagnetic absorbers, that is, by adjusting the two beams The phase difference between the coherent lights realizes the dynamic regulation of the absorption intensity. During the research process, the applicant of the present invention noticed that most of the existing coherent wave absorbers can only adjust the absorption rate at a fixed absorption peak frequency, lack real-time adjustment of the absorption peak frequency, or use A tunable coherent perfect absorber with a bias circuit made of expensive materials such as graphene. On the other hand, 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 a...

Embodiment 2

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

Embodiment 3

[0035] The overall composition of a water-based interlayer metasurface tunable coherent absorber is the same as that of 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: permittivity where ε ∞ (T) is the high frequency dielectric constant, ε s (T) is the dielectric constant at static state, and τ(T) refers to the relaxation time, and their values ​​are related to the water temperature T (°C), and the water is manipulated by adjusting the ambient temperature and controlling the wave phase The interaction between the base interlayer metasurface coherent absorber and the incident coherent electromagnetic wave realizes the dynamic regulation of its absorption frequency and absorption rate.

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

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Abstract

The invention discloses a water-based interlayer metasurface tunable coherent wave absorber, which is a novel structure, which solves the problem of using low-cost materials to realize real-time dynamic adjustment of the frequency and amplitude of coherent absorption peaks and to adjust the incidence of incident waves in different polarization states. Regular regulation of the absorption channel of the coherent beam. The periodic arrangement of micro-units constitutes the overall structure of the water-based interlayer metasurface tunable coherent absorber. The micro-unit is a sandwich structure composed of a metal pattern PCB substrate with double-opening split resonator rings etched on both sides and a water intermediate layer. It is equal to the length and width of the substrate. By adjusting the relative orientation of the openings of the resonant rings on both sides, the complete coincidence and separation of the incident coherent wave absorption channels under different polarization states can be achieved. It has important application value in frequency filtering and polarization selective transmittance. The phase difference of the coherent wave absorber can be dynamically adjusted in real time for its wave absorption properties such as absorption frequency and absorption rate, which improves the controllability of the coherent wave absorber.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic waves, and mainly relates to novel artificial electromagnetic materials and electromagnetic wave regulation, in particular to a novel structure of a water-based interlayer metasurface tunable coherent wave absorber, which can be used for all-optical switches, master control stealth, electromagnetic modulation and the like . [0002] technical background [0003] The powerful dynamic controllability of the coherent perfect absorber makes it have important research and application value in all-optical switching, electromagnetic modulation, detectors, sensors, master control stealth and so on. It has a time-reversal symmetry relationship with the well-known laser, and coherent absorption can achieve complete absorption of electromagnetic wave energy by the interference between two coherent beams incident symmetrically in opposite directions. In 2010, the coherent perfect absorber originally d...

Claims

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Application Information

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Patent Type & Authority Patents(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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