CN108051874A - The unidirectional marginality transmission of self-conductance of magnetic photonic crystal tablet - Google Patents
The unidirectional marginality transmission of self-conductance of magnetic photonic crystal tablet Download PDFInfo
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- CN108051874A CN108051874A CN201711315307.0A CN201711315307A CN108051874A CN 108051874 A CN108051874 A CN 108051874A CN 201711315307 A CN201711315307 A CN 201711315307A CN 108051874 A CN108051874 A CN 108051874A
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Abstract
A kind of unidirectional marginality transmission of the self-conductance of magnetic photonic crystal tablet, it is related to photonic crystal technical field, and in particular to a kind of unidirectional marginality transmission of the self-conductance of magnetic photonic crystal tablet.It includes magnetic pole, absorbing material, same sex dielectric material, excitation probe, reception probe, a certain number of magnetic poles are arranged according to honeycomb, it is filled between magnetic pole by air, the absorbing material is enclosed in the outside of magnetic pole honeycomb, excitation probe, reception probe are arranged between magnetic pole and magnetic pole and positioned at the border of magnetic pole honeycomb, perpendicular to excitation probe and the line for receiving probe, above-mentioned part is fixed between the two blocks of same sex dielectric materials incident end face of the excitation probe.After adopting the above technical scheme, the present invention has the beneficial effect that：It realizes that the unidirectional edge of complete self-conductance transmits using magnetic photonic crystal tablet.
Description
Technical field
The present invention relates to photonic crystal technical fields, and in particular to a kind of unidirectional edge of self-conductance of magnetic photonic crystal tablet
State is transmitted.
Background technology
Photonic crystal refers to the artificial periodic dielectric structures with photon band gap characteristic.Photonic crystal concept is derived from week
The Schrodinger equation analogy of maxwell equation group and periodical Hamilton in phase property medium.At present, this analogy expands to
Chiral marginality, this is that Two-dimensional electron system is subject to the quantum hall effect having during strong magnetic fields.The electromagnetism of analogy
Unidirectional edge pattern is confined on specific two-dimensional magnetic photonic crystal edge, and only there are one direction, such sides for group velocity
Edge pattern had carried out experimental verification by gyromagnetism photonic crystal in microwave section later.
At present, unidirectional self-conductance electric wave is the electromagnetic transmission that TEM patterns are supported using upper and lower metal cover board, and this is
Electromagnetic wave in system is similar to the TM patterns in two-dimensional structure, and local passes in the plane parallel to Electromagnetic Wave Propagation direction
Defeated, this structure realizes that one-way can only operate in microwave section.In optical band, metal generally regards plasma material, and this as
When metal absorption loss become increasingly severe.So if realize really complete self-conductance using magnetic photonic crystal tablet
One-way transmission mode will be highly significant.
The content of the invention
In view of the defects and deficiencies of the prior art, the present invention intends to provide a kind of magnetic photonic crystal tablet from
Unidirectional marginality transmission is led, it can utilize magnetic photonic crystal tablet to realize really the one-way transmission mode of self-conductance completely.
To achieve the above object, the present invention is using following technical scheme：It includes magnetic pole 1, absorbing material 2, the same sex and is situated between
Material 3, excitation probe 4 receive probe 5, and a certain number of magnetic poles 1 are arranged according to honeycomb, filled out between magnetic pole 1 by air
It fills, the absorbing material 2 is enclosed in the outside of 1 honeycomb of magnetic pole, and excitation probe 4, reception probe 5 are arranged on magnetic pole 1 and magnetic
Between column 1 and positioned at the border of magnetic pole honeycomb, the incident end face of the excitation probe 4 is perpendicular to excitation probe 4 and reception
The line of probe 5, above-mentioned part are fixed between two blocks of same sex dielectric materials 3.
Two blocks of same sex dielectric materials 3 can only have one piece.
In the honeycomb that the magnetic pole (1) is formed on border, a magnetic pole 1 can be taken out or be substituted for metal column.
The magnetic pole 1 is ferrite column, and limited height is preferably 10-20mm, radius 2-3mm.
The same sex dielectric material 3 is organic glass, and limited thickness is preferably 3-8mm, dielectric constant 2.0-2.5.
The refractive index of background material will generally be less than the equivalent refractive index of photonic crystal panel, and then generate self-conductance energy band.
The absorbing material 2 leaves certain distance in encirclement excitation probe 4, the one side of reception probe 5 and magnetic pole 1.Shape
The passage collectively formed into air with magnetic photonic crystal tablet border, in addition three faces closely surrounded with absorbing material so as to
Can reach reduces electromagnetic wave side scattering effect.
The operation principle of the present invention：Applied bias magnetic field is applied to it using Helmholtz coils, magnetic direction is vertical
In organic glass tablet.Magnetic photonic crystal tablet is made to be in horizontal saturated magnetization state.This honeycomb magnetism photon is brilliant
Body tablet lacks time symmetry in the case that broken, can excite the chiral marginality of self-conductance, and transport phenomena and magnetic photon are brilliant
The lattice structure of body tablet, the height of magnetic material, the thickness of same sex dielectric material, externally-applied magnetic field direction, lattice defect are related.
After adopting the above technical scheme, the present invention has the beneficial effect that：It is realized completely certainly using magnetic photonic crystal tablet
The unidirectional edge transmission led.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is A portions enlarged drawing in Fig. 1；
Fig. 3 is B portions enlarged drawing in Fig. 1；
Fig. 4 is the test transmission spectrum of same sex dielectric material thickness 3mm of the present invention and the dispersion relation of boundary scheme；
Fig. 5 is the test transmission spectrum of same sex dielectric material thickness 5mm of the present invention and the dispersion relation of boundary scheme；
Fig. 6 is the test transmission spectrum of same sex dielectric material thickness 8mm of the present invention and the dispersion relation of boundary scheme；
Fig. 7 is tablet of the present invention only fixed poly (methyl methacrylate) plate below, and thickness is (a) 3mm, (b) 5mm, the transmission of (c) 8mm
Spectrum；
Fig. 8 is that the present invention takes out poly (methyl methacrylate) plate is fixed below the tablet of a magnetic pole, and thickness is (a) 3mm, (b) 5mm, (c)
The transmission spectrum of 8mm；
Fig. 9 is that metal column of the present invention substitutes poly (methyl methacrylate) plate is fixed below the tablet of a magnetic pole, and thickness is (a) 3mm, (b)
5mm, the transmission spectrum of (c) 8mm.
Reference sign：Magnetic pole 1, absorbing material 2, same sex dielectric material 3, excitation probe 4, reception probe 5.
Specific embodiment
The application is by project of national nature science fund project（61701187）, Jiangsu College physicism project
The research and development plan of (16KJB510004,15KJA460004), Huai'an emphasis（Industry and informationization）（HAG2015039）, Jiangsu Province
University student's practice innovation drill program project (201610323020Z) support in 2016.
Referring to shown in Fig. 1-Fig. 9, present embodiment the technical solution adopted is that：It include magnetic pole 1, absorbing material 2,
Same sex dielectric material 3, excitation probe 4 receive probe 5, and a certain number of magnetic poles 1 arrange according to honeycomb, between magnetic pole 1 by
Air is filled, and the absorbing material 2 is enclosed in the outside of 1 honeycomb of magnetic pole, and excitation probe 4, reception probe 5 are arranged on magnetic pole
Between 1 and magnetic pole 1 and positioned at the border of magnetic pole honeycomb, the incident end face of the excitation probe 4 perpendicular to excitation probe 4 with
The line of probe 5 is received, above-mentioned part is fixed between two blocks of same sex dielectric materials 3.Two blocks of same sex dielectric materials 3 can be with
Only one piece.In the honeycomb that the magnetic pole (1) is formed on border, a magnetic pole 1 can be taken out or be substituted for metal column.Institute
Magnetic pole 1 is stated as ferrite column, limited height is preferably 10-20mm, radius 2-3mm.The same sex dielectric material 3 is to have
Machine glass, limited thickness are preferably 3-8mm, dielectric constant 2.0-2.5.The refractive index of background material will generally be less than photon
The equivalent refractive index of crystal plate, and then generate self-conductance energy band.The absorbing material 2 is surrounding excitation probe 4, is receiving probe
Certain distance is left with magnetic pole 1 in 5 one side.The passage that an air is collectively formed with magnetic photonic crystal tablet border is formed,
Other three face, which is closely surrounded to reach with absorbing material, reduces electromagnetic wave side scattering effect.
Applied bias magnetic field is applied to it using Helmholtz coils, magnetic direction is perpendicular to organic glass tablet.Make
Magnetic photonic crystal tablet is in horizontal saturated magnetization state.This honeycomb magnetic photonic crystal tablet is in the broken scarce time pair
Claim under implementations, lattice structure, the magnetic of the chiral marginality of self-conductance, transport phenomena and magnetic photonic crystal tablet can have been excited
The property height of material, the thickness of same sex dielectric material, externally-applied magnetic field direction, lattice defect are related.
Fig. 4-Fig. 6 (a) is to applied bias magnetic field under the action of 600oe, substrate thickness is respectively 3mm, 5mm, 8mm
When, experiment measures obtained transmission spectrum.Time-reversal symmetry is lacked due to broken, electromagnetic wave when frequency is located at chiral marginality
It can be transmitted along direction, corresponding on transmission spectrum should show as representing before electromagnetic wave to passing and the parameter of reverse transfers amplitude
S21 and S12 has very big difference.It can be seen that when frequency is located at 10.0-10.8GHz, the amplitude of S21 is deep much larger than S12
Degree is about 30dB.Fig. 4-Fig. 6 (b) be ignore that Loss Terms are calculated project to the borderline energy band diagrams of M-K.Compare
The transmission spectrum and energy band diagram of emulation, the two are coincide very well, and the minor shifts of bandgap frequency are as caused by machining accuracy.Experiment
Illustrate that this honeycomb magnetic photonic crystal tablet lacks time symmetry in the case that broken, the chiral side of self-conductance can have been excited
Edge state, transmission direction are related with specific border motif and externally-applied magnetic field direction.
Substrate is poly (methyl methacrylate) plate below magnetic photonic crystal tablet, and the above is air.On the asymmetrical junction of z=0
The phenomenon that structure is usually obvious is exactly that transmission mode no longer has Qi Mo and even mould.When substrate interference very little, from waveguide mode energy
Effectively for local inside tablet, wave function can also be approximately Qi Mo and even mould, and band gap properties will be also kept.Referring to figure
Fix poly (methyl methacrylate) plate below 7 tablets, thickness is (a) 3mm, (b) 5mm, the transmission spectrum of (c) 8mm.In Fig. 7 (a), in frequency
10GHz-10.8GHz there is more apparent one-way at place；In Fig. 7 (b), one-way transmission frequency separation tapers into, S21 with
The energy difference of S12 becomes smaller；The energy difference of Fig. 7 (c) S21 and S12 are substantially in 10dB or so, and one-way is very not
Substantially.Conclusion can be provided from the transmission spectrum：When the thickness of organic glass gradually increases, the symmetry on the plane of z=0
It lacks more serious by broken, gradually dies down to the Local Characteristic of electromagnetic wave, the band gap properties of photonic crystal fade away, and ultimately cause list
Tropism disappears.
When air column substitution magnetic pole (taking out a magnetic pole) or metal column substitute a borderline magnetic pole；We are according to phase
Size together, material parameter are prepared for actual sample, by demonstrating photonic crystal on the measurement experiment of defeated spectrum is uploaded to border
The property of the self-conductance chirality border state of tablet.Fig. 8, Fig. 9 be respectively on border two probe middle positions take out a magnetic pole,
The measurement transmission spectrum of the metal column of an identical structural parameters is inserted at the position.Tablet fixes poly (methyl methacrylate) plate up and down,
Thickness is (a) 3mm, (b) 5mm, (c) 8mm.No matter which kind of situation the defects of, from the frequency range of conductive boundary state, forward direction passes
Defeated to be still far longer than backwards to transmitting, the transmission spectrum of forward and reverse big difference is not affected by apparent influence.It is considered that no matter border
The defects of upper introducing is weak scatterers or strong scatterer, does not have the radiation leakage energy of oriented space substantially, electromagnetic wave is in defect
Position will not all generate apparent backscattering field, but most of energy stream automatically selects shortest path bypass barrier or lacks
It falls into, electromagnetic wave keeps one way propagation.Only for different scattering objects, communication process also slightly deposits difference, by comparing air
Column and metal column transmission spectrum find electromagnetic wave when around metal column with the increase reverse transfer of organic glass plate thickness
Spectrum becomes more next high, and forward and reverse difference becomes smaller, and illustrates when organic glass is thicker, and the local effect of electromagnetic wave becomes in tablet
It is weak.
The above is clearly and completely described the technical solution in the embodiment of the present invention, it is clear that described
Embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiments obtained without making creative work, belong to protection of the present invention
Scope.
Claims (6)
1. a kind of unidirectional marginality transmission of the self-conductance of magnetic photonic crystal tablet, it is characterised in that：It includes magnetic pole (1), inhales ripple
Material (2), same sex dielectric material (3), excitation probe (4), reception probe (5), a certain number of magnetic poles (1) are according to honeycomb
Arrangement, magnetic pole are filled between (1) by air, and the absorbing material (2) is enclosed in the outside of magnetic pole (1) honeycomb, and excitation is visited
Pin (4), reception probe (5) are arranged between magnetic pole (1) and magnetic pole (1) and positioned at the border of magnetic pole honeycomb, the excitation
For the incident end face of probe (4) perpendicular to excitation probe (4) and the line for receiving probe (5), above-mentioned part is fixed on two pieces of same sexes
Between dielectric material (3).
2. a kind of unidirectional marginality transmission of the self-conductance of magnetic photonic crystal tablet according to claim 1, it is characterised in that：
Two blocks of same sex dielectric materials (3) can only have one piece.
3. a kind of unidirectional marginality transmission of the self-conductance of magnetic photonic crystal tablet according to claim 1, it is characterised in that：
In the honeycomb that the magnetic pole (1) is formed on border, a magnetic pole (1) can be taken out or be substituted for metal column.
4. a kind of unidirectional marginality transmission of the self-conductance of magnetic photonic crystal tablet according to claim 1, it is characterised in that：
The magnetic pole (1) is ferrite column, and limited height is preferably 10-20mm, radius 2-3mm.
5. a kind of unidirectional marginality transmission of the self-conductance of magnetic photonic crystal tablet according to claim 1, it is characterised in that：
The same sex dielectric material (3) is organic glass, and limited thickness is preferably 3-8mm, dielectric constant 2.0-2.5.
6. a kind of unidirectional marginality transmission of the self-conductance of magnetic photonic crystal tablet according to claim 1, it is characterised in that：
The absorbing material (2) leaves certain distance in encirclement excitation probe (4), the one side of reception probe (5) and magnetic pole (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711315307.0A CN108051874B (en) | 2017-12-12 | 2017-12-12 | self-guiding unidirectional edge state transmission of magnetic photonic crystal flat plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711315307.0A CN108051874B (en) | 2017-12-12 | 2017-12-12 | self-guiding unidirectional edge state transmission of magnetic photonic crystal flat plate |
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| CN108051874B CN108051874B (en) | 2019-12-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198679A (en) * | 2020-09-18 | 2021-01-08 | 电子科技大学 | Electromagnetic device for two-dimensional photonic crystal material spin magnetic field excitation |
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| CN104466323A (en) * | 2014-12-22 | 2015-03-25 | 淮阴师范学院 | Magnetic photonic crystal self-conductance unidirectional edge state transmission method based on surface finish |
| CN106908861A (en) * | 2017-04-25 | 2017-06-30 | 淮阴师范学院 | A kind of One-dimensional magneto-photonic crystal chain with asymmetric primitive structure |
| CN107015295A (en) * | 2017-05-31 | 2017-08-04 | 淮阴师范学院 | A kind of unidirectional bulk wave transmission method of honeycomb gyromagnet photonic crystal |
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2017
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| CN104466323A (en) * | 2014-12-22 | 2015-03-25 | 淮阴师范学院 | Magnetic photonic crystal self-conductance unidirectional edge state transmission method based on surface finish |
| CN106908861A (en) * | 2017-04-25 | 2017-06-30 | 淮阴师范学院 | A kind of One-dimensional magneto-photonic crystal chain with asymmetric primitive structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198679A (en) * | 2020-09-18 | 2021-01-08 | 电子科技大学 | Electromagnetic device for two-dimensional photonic crystal material spin magnetic field excitation |
| CN112198679B (en) * | 2020-09-18 | 2021-12-03 | 电子科技大学 | Electromagnetic device for two-dimensional photonic crystal material spin magnetic field excitation |
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