CN110444897A - A kind of novel dislocation Meta Materials coding mode - Google Patents
A kind of novel dislocation Meta Materials coding mode Download PDFInfo
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- CN110444897A CN110444897A CN201910581519.6A CN201910581519A CN110444897A CN 110444897 A CN110444897 A CN 110444897A CN 201910581519 A CN201910581519 A CN 201910581519A CN 110444897 A CN110444897 A CN 110444897A
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- meta materials
- beam splitting
- coding mode
- coded sequence
- dislocation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- Aerials With Secondary Devices (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention discloses a kind of novel dislocation Meta Materials coding mode, any one side on two-dimensional surface is directed upwardly into rhythmic phase gradient variation coded sequence, and translates in coded sequence of another direction to lastrow or previous column.Cycle length corresponding to beam splitting has not only been extended to non-integer fraction by the present invention, so that beam splitting angular freedom greatly increases；Good thinking guidance can also be provided for design greater number light beam, have very great meaning for reducing RCS and regulating and controlling THz wave for greater flexibility.
Description
Technical field
The invention belongs to Terahertz Meta Materials fields, and in particular to a kind of novel dislocation volume for realizing Meta Materials specific function
Code mode.
Background technique
On electromagnetic spectrum, the electromagnetic wave generally by frequency between 0.1-10THz is referred to as THz wave, it is located at infrared
Between microwave.The particular frequency spectrum position as locating for THz wave makes it have many unique properties, therefore it is in biology
The every field such as medicine, astronomy, security protection, imaging, communication suffer from highly important researching value.Exactly because also Terahertz
Great potentiality possessed by wave, so that becoming worldwide research hotspot in recent years.Wherein beam splitter is as manipulation terahertz
The design of the hereby important devices of wave, more flexible, more high-freedom degree beam splitter also becomes more and more important.
But because lacking electromagnetic response required for suitable natural material meets in terahertz wave band, people are past
Toward being manipulated using electromagnetism Meta Materials (Metamaterial) to THz wave, the dimension cells of use macroscopic view relatively instead of
Atom, the molecular dimension unit of natural material breach the electromagnetic response pole of natural material to reach expected electromagnetic response
Limit.Because of its special electromagnetic property, had received widespread attention in Disciplinary Frontiers such as chemistry, physics, information, materials.In
2014 Nian Cui iron armies et al. propose the concept of coding Meta Materials in microwave band, two units for being 180 ° by relative phase difference
Respectively as " 0 " unit and " 1 " unit, the design of unit is simplified with digitally coded mode, and then may be implemented more flexible
Electromagnetic wave regulation.The application for encoding Meta Materials has been extended to optical band and terahertz wave band from microwave band by follow-up work.
Coding Meta Materials have many advantages, such as that design is simple, low in cost, easy to process, cut promoting antenna performance, reducing radar scattering
Face (RCS) etc. suffers from important application prospect.
The beam splitting principle of coding Meta Materials can be explained with broad sense Snell's law, under same working frequency, point
Beam angle degree depends primarily on selected unit cycle length.In the Meta Materials based on coding theory design with beam splitting function
When, conventional coding mode is to be each introduced into fixation between the adjacent cells on two change in coordinate axis direction of x, y of two-dimentional Meta Materials
Phase gradient it is poor, and overall surface be periodic arrangement structure.Wherein often used to obtain higher beam splitting freedom degree
It introduces high-order coding or several subelement repeated arrangements is formed into the hyperelement of N*N to change the unit period, and then change
Beam splitting angle.
This conventional coding permutations mode limits the freedom degree of beam splitting design, beam splitting angle corresponding unit period pair
It only can be the integral multiple of the unit side length in same fixed subelement.The quantity of design beam splitting is mostly two and four at present,
It is extremely limited.Therefore conventional coding mode has very big office for the beam splitter of high-freedom degree and the design of RCS reduction
It is sex-limited, it is badly in need of being resolved.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of novel dislocation Meta Materials coding modes, lead to
It crosses and changes the conventional coding mode for introducing fixed skew along two change in coordinate axis direction, solve and existing compiled using conventional
The lower problem of beam splitting structure beam splitting freedom degree designed by code mode.
The technical scheme is that a kind of novel dislocation Meta Materials coding mode, any one side on two-dimensional surface
It is directed upwardly into rhythmic phase gradient variation coded sequence, and in another direction to the coded sequence of lastrow or previous column
It is translated.
Preferably, the cycle length extends to non-integer fraction.
Preferably, increase the angular freedom of beam splitting.
Preferably, the freedom degree of beam splitting quantity increases to 8.
The beneficial effects of the present invention are:
1. the code Design mode of coding Meta Materials is greatly enriched, to design more flexible, the higher beam splitting of freedom degree
Device provides new thinking.
2. cycle length corresponding to beam splitting has not only been extended to non-integer fraction by the present invention, so that beam splitting angle is free
Degree greatly increases.
3. this novel dislocation coding mode can also provide good thinking guidance for design greater number light beam, right
There is very great meaning in reducing RCS and regulating and controlling THz wave for greater flexibility.
Detailed description of the invention
Fig. 1 be the present invention choose basic cell structure (applicability of novel arrangement mode provided by the invention is wider,
He, which encodes basic unit, also may be implemented corresponding function).
A is the beam splitting effect diagram of conventional coded sequence " 000111 ... " in Fig. 2, b be the coded sequence wherein
A kind of beam splitting effect diagram of Heterogeneous Permutation, c are the equivalent structure of b structure, and d is the simulation result of the structure beam splitting effect；
Gray cell: " 0 " cellular construction, white cells: " 1 " cellular construction.
A, b, c, d are respectively the coding Meta Materials schematic diagram that the dislocation coding permutations mode based on proposition designs in Fig. 3.
Fig. 4 is the simulation result schematic diagram of the corresponding far-field RCS of a, b, c, d corresponding construction in Fig. 3.
In attached drawing, parts list represented by the reference numerals are as follows:
lx: the width of silicon column；ly: the length of silicon column；
H: the height of silicon column；px、py: the period of unit；
Γ: the period of equivalent structure；
Gray cell: " 0 " cellular construction；
White cells: " 1 " cellular construction.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, embodiment of the present invention is made below further
Ground detailed description.
A kind of novel dislocation Meta Materials coding mode, for the basic cell structure of selection referring to Fig. 1, which is one kind in silicon
In substrate rectangular silicon column structure (Terahertz frequency range refractive index be 3.45) all-medium structure, this structure it is easy to process and
Design, and avoid ohmic loss possessed by metal Meta Materials.Wherein parameter is kept for h=200 μm, px=py=p=150 μ
M is constant, and the thickness of substrate influences the effect that very little only serves support construction to the present invention, chooses and is suitble to parameter, the present invention
Choose with a thickness of 500 μm.By changing lxAnd lyTo change phase delay." 0 " cell parameters chosen in the present invention are lx=
75 μm, ly=75 μm；" 1 " cell parameters are lx=50 μm, ly=93.5 μm.Wherein the polarization state of incident electromagnetic wave is x-polarisation,
Working frequency is set as 1THz.
The present invention can carry out theoretical calculation using CST MICROWAVE STUDIO software, obtain far field of the invention
RCS distribution.
Fig. 2 gives one of Heterogeneous Permutation of conventional coded sequence " 000111 ... ", this Heterogeneous Permutation side
Formula and conventional arrangement difference, which is the coded sequence by " 000111 ... " along the x-axis direction along the y-axis direction
Upper every a line obtains previous row to two units of left.
This Heterogeneous Permutation mode is without preferably corresponding to situation in conventional Calculation Method, therefore one is given in Fig. 2 (c)
Heterogeneous Permutation mode, is converted to conventional phase gradient arrangement mode by kind equivalent substitution calculation, convenient for calculating.For normal
Coded sequence is advised, equivalent cycle length is only the integral multiple of single subelement, and beam splitting direction is only two reference axis sides
To.After Heterogeneous Permutation, cycle length equivalent at this timeWherein θ value can be by formula θ=sin-1(λ Γ) is calculated, knot
Fruit is 48 °.φ is determined that result is 116.6 ° by the direction perpendicular to phase gradient.The imitative of the beam splitting effect is given in figure (d)
Very as a result, wherein within 1 °, degree of fitting is fine for φ and θ value and calculated value error.
In addition, this Heterogeneous Permutation mode also provides new thinking to design more flexible, the higher beam splitter of freedom degree.
The angular freedom that beam splitting can not only be increased, can also increase the freedom degree of beam splitting quantity.A, b, c, d are respectively base in Fig. 3
In some coding Meta Materials schematic diagrames that dislocation coding permutations mode designs, Fig. 4 is the imitative of the corresponding beam splitting effect of corresponding construction
True result.The equivalent model that corresponding beam splitting angle can be provided with reference to Fig. 2 is calculated, and is no longer repeated one by one here.
As can be seen from the figure Heterogeneous Permutation mode of the invention substantially increases compared with conventional coding permutations mode
The freedom degree of beam splitting.The various structures and theoretical error of design are smaller, and fitting is fine.It can be in Terahertz and its all band
Design novel beam splitter, reduction RCS provides new thinking.
The embodiment of the present invention to the model of each device in addition to doing specified otherwise, the model of other devices with no restrictions,
As long as the device of above-mentioned function can be completed.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of novel dislocation Meta Materials coding mode, which is characterized in that any one side on two-dimensional surface has been directed upwardly into
The phase gradient in period changes coded sequence, and translates in coded sequence of another direction to lastrow or previous column.
2. a kind of novel dislocation Meta Materials coding mode according to claim 1, which is characterized in that the cycle length prolongs
Reach non-integer fraction.
3. a kind of novel dislocation Meta Materials coding mode according to claim 1, which is characterized in that increase the angle of beam splitting
Freedom degree.
4. a kind of novel dislocation Meta Materials coding mode according to claim 1, which is characterized in that the freedom of beam splitting quantity
Degree increases to 8.
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| CN201910581519.6A CN110444897A (en) | 2019-06-29 | 2019-06-29 | A kind of novel dislocation Meta Materials coding mode |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2413294A1 (en) * | 2009-03-27 | 2012-02-01 | Universidad Politecnica De Valencia | Optical security mark comprising metamaterials with a magnetic response, authentication method using said mark, and use of said mark applied to an object |
| CN104157983A (en) * | 2014-08-14 | 2014-11-19 | 东南大学 | One-bit digital super surface |
| CN107465000A (en) * | 2017-07-23 | 2017-12-12 | 中国人民解放军空军工程大学 | Broadband, the insensitive spiral coding RCS of polarization reduce super surface and its design method |
| CN107658571A (en) * | 2017-09-26 | 2018-02-02 | 中国人民解放军空军工程大学 | Coding absorbing meta-material applied to the reduction of wideband radar reflecting section |
-
2019
- 2019-06-29 CN CN201910581519.6A patent/CN110444897A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2413294A1 (en) * | 2009-03-27 | 2012-02-01 | Universidad Politecnica De Valencia | Optical security mark comprising metamaterials with a magnetic response, authentication method using said mark, and use of said mark applied to an object |
| CN104157983A (en) * | 2014-08-14 | 2014-11-19 | 东南大学 | One-bit digital super surface |
| CN107465000A (en) * | 2017-07-23 | 2017-12-12 | 中国人民解放军空军工程大学 | Broadband, the insensitive spiral coding RCS of polarization reduce super surface and its design method |
| CN107658571A (en) * | 2017-09-26 | 2018-02-02 | 中国人民解放军空军工程大学 | Coding absorbing meta-material applied to the reduction of wideband radar reflecting section |
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Application publication date: 20191112 |
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