CN102760956B - Diffuse reflecting device based on metamaterial - Google Patents
Diffuse reflecting device based on metamaterial Download PDFInfo
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- CN102760956B CN102760956B CN201110111718.4A CN201110111718A CN102760956B CN 102760956 B CN102760956 B CN 102760956B CN 201110111718 A CN201110111718 A CN 201110111718A CN 102760956 B CN102760956 B CN 102760956B
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Abstract
The invention relates to a diffuse reflecting device based on a metamaterial, which comprises a metamaterial and a reflecting layer arranged at the upper middle part on one side of the metamaterial, wherein the metamaterial comprises a plurality of cubic structure units overlapped along the three-dimensional direction, the size of each cubic structure unit is smaller than one fifth of the wavelength of electromagnetic waves, each cubic structure unit comprises a base material and one or more small holes formed in the base material, and the dielectric constant and the magnetic conductivity of each cubic structure unit are randomly distributed. The electromagnetic parameter in each point of the metamaterial is changed in a punching way so that the quantity of the electromagnetic fields in the entire metamaterial is randomly distributed, and the electromagnetic waves pass through the matamaterial, are reflected by the reflecting layer and then pass through the metamaterial once again to form diffuse reflection. The diffuse reflecting device has the advantages of simple technology, low cost and easiness in realization.
Description
Technical field
The present invention relates to a kind of diffuse device, particularly relate to a kind of diffuse device based on Meta Materials.
Background technology
Diffuse reflection refers to electromagnetic wave by rough surface irregularly to the phenomenon of all directions reflection.A lot of object, as plant, wall, clothes etc., it is level and smooth that its surface slightly appears to, but examine with magnifying glass, will see that its surface is rough, thus be originally parallel sunlight by after these surface reflections, just fill the air ground directive different directions.But adopt above-mentioned material to be difficult to make it that diffuse reflection occur for the electromagnetic wave that wavelength is longer, need to change the physical appearance of material to make its surface form larger zigzag could to realize the longer electromagnetic diffuse reflection of wavelength, have larger restriction to the surface configuration of material and thickness.
Meta Materials refers to some artificial composite structures with the extraordinary physical property not available for natural material or composite material.By the structurally ordered design on the key physical yardstick of material, the restriction of some apparent natural law can be broken through, thus acquisition exceeds the intrinsic common meta-materials function of nature.
The Meta Materials of current routine is mainly reached changed the dielectric constant of Meta Materials each point and the object of magnetic permeability by periodic arrangement is different on base material artificial metal's micro-structural.But want the dielectric constant and the magnetic permeability that change Meta Materials each point, it is not only way that Meta Materials base material arranges artificial metal's micro-structural, and on Meta Materials base material, arrange artificial metal's micro-structural complex process, realization difficulty.
Summary of the invention
Technical problem to be solved by this invention is, for the deficiencies in the prior art propose a kind of technique simple, with low cost and be easy to realize the diffuse device based on Meta Materials.
The technical scheme that the present invention solves the employing of its technical problem is to provide a kind of diffuse device based on Meta Materials, it comprises: Meta Materials and the reflector be arranged in this Meta Materials side, this Meta Materials is formed by stacking along three-dimensional by multiple cube structure unit, one or more apertures that this cube structure unit comprises base material and formed in the substrate, the dielectric constant of each cube structure unit and magnetic permeability random distribution.
This base material is made up of ceramic material, macromolecular material, ferrite material or ferromagnetic material.
Shared by those apertures, the volume of cube structure unit is random distribution.
This cube structure cell size is less than 1/5th of the electromagnetic wavelength of required response.
In this cube structure unit base material each, the upper little hole number formed is identical or different.
The medium that refractive index is identical or different is filled with in those apertures.
Air is filled with in those apertures.
The volume of cube structure unit shared by those apertures is all identical and be filled with the medium of refractive index random distribution in those apertures.
This reflecting surface is made up of metal material.
Those apertures are this cube structure unit through.
The present invention adopts hole knockout to make the electromagnetism number of fields of Meta Materials entirety be random distribution to the electromagnetic parameter changing Meta Materials each point, electromagnetic wave by reflective layer reflects and again through this Meta Materials and form diffuse reflection, has technique simple, with low cost and be easy to the beneficial effect that realizes after Meta Materials.
Accompanying drawing explanation
Fig. 1 is the diffuse device first preferred embodiment first execution mode perspective view that the present invention is based on Meta Materials;
Fig. 2 is the cube structure unit three-dimensional structural representation forming Meta Materials in diffuse device first preferred embodiment first execution mode that the present invention is based on Meta Materials;
Fig. 3 is the front view of the perspective view shown in Fig. 1;
Fig. 4 is the end view of the perspective view shown in Fig. 1;
Fig. 5 is the front view of diffuse device first preferred embodiment second execution mode that the present invention is based on Meta Materials;
Fig. 6 is the front view of diffuse device second preferred embodiment that the present invention is based on Meta Materials.
Embodiment
Meta Materials entirety can be regarded multiple cube structure unit as and be formed by stacking along three-dimensional X-Y-Z direction.Because Meta Materials self need have an impact to electromagnetic wave, therefore require that the size of stereochemical structure unit is less than 1/5th of the electromagnetic wavelength of required response.Preferably, each cube structure cell size is all equal and be 1/10th of the electromagnetic wavelength of required response.
The response of Meta Materials to electromagnetic field depends primarily on each cube structure unit to the response of electromagnetic field, when cube structure element number is abundant, each cube structure unit will superpose the response of electromagnetic field thus from each physical characteristic macroscopically changing incident electromagnetic wave.
Those of ordinary skill in the art are known, when a branch of electromagnetic wave by a kind of Medium Propagation to another medium time, electromagnetic wave can reflect, when the refraction index profile of material inside is non-homogeneous, electromagnetic wave will to the larger position deviation of refractive index ratio, electromagnetic refractive index with
proportional, thus by changing DIELECTRIC CONSTANT ε and/or magnetic permeability μ distribution in the material, the object changing electromagnetic wave propagation path just can be reached.The present invention is also provided with reflecting surface in Meta Materials side simultaneously, electromagnetic wave is refracted through Meta Materials and changes the direction of propagation later again by reflective surface, is again also again refracted through Meta Materials and is changed the direction of propagation and makes the present invention have irreflexive technique effect by the electromagnetic wave that reflects.
Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4.Fig. 1 be the present invention is based on the diffuse device first preferred embodiment perspective view of Meta Materials, Fig. 2 be form the cube structure cell schematics of Meta Materials in diffuse device first preferred embodiment that the present invention is based on Meta Materials, Fig. 3 be the present invention is based on the diffuse device first preferred embodiment front view of Meta Materials, Fig. 4 is the diffuse device first preferred embodiment end view that the present invention is based on Meta Materials.As shown in Figures 1 to 4, diffuse device of the present invention comprises Meta Materials 10 and the reflector 20 be arranged on surface, Meta Materials 10 side.Reflector 20 is the reflecting surface with good electrical magnetic wave reflection characteristic, such as metal mirror etc.
Meta Materials 10 is formed by stacking along three-dimensional X-Y-Z direction by multiple cube structure unit 100, the aperture 110 that each cube structure unit 100 comprises base material 120 and formed on base material 120.In the present embodiment, the volume of aperture 110 is random distribution, because nature in cavity can fill up air dielectric, the air dielectric of varying number produces different electromagnetic responses by cube structure unit 100, and therefore aperture 110 volume of random distribution makes the overall electromagnetic parameter of Meta Materials 10 also in random distribution state.Change the volume of this aperture 110 by changing its degree of depth, cross sectional pattern or size to realize.
Can by inserting the identical all kinds of media to electromagnetic response sensitivity in the cavities to electromagnetic response in order to strengthen cube structure unit 100 further, it can be pottery, macromolecular material, ferroelectric material or ferrite material etc.More mixing to make Meta Materials 10 electromagnetic parameter distribute simultaneously, also can fill the different all kinds of media of refractive index as iodine crystal, cupric oxide, crystal, quartz, polystyrene, sodium chloride, glass, air etc. in the aperture 110 that volume is different.
Aperture 110 volume is made to be that random distribution state has numerous embodiments.Fig. 1 to Fig. 4 is the first execution mode.It is only formed with an aperture 110 on cube structure unit, but the degree of depth of aperture 110, cross sectional pattern or size are all different.When this makes large-scale production, drilling technology parameter and perforating mold variation, the complexity adding technique too increases the error rate of product simultaneously.
Fig. 5 for a change aperture 110 accounts for the second execution mode front view of cube structure unit 100 volume.Be formed with multiple aperture 110 in cubic units base material, cross sectional pattern, the size of each aperture 110 are all the same with the degree of depth, but the quantity of aperture 110 is random distribution.Adopting the method changing aperture 110 quantity to change the volume of cube structure shared by it makes Meta Materials overall refractive index be easier to regulate, and can save the die sinking expense of perforating mold.Identical with the first execution mode, all can fill the identical medium of refractive index in those apertures 110 all, or more mix to make Meta Materials electromagnetic parameter distribute, all kinds of media that random filling refractive index is different in those apertures 110.
Although the second execution mode of first embodiment of the invention solves drilling technology parameter and the diversified problem of perforating mold in the first execution mode, but because the present invention is very strict to the size requirements of cube structure unit 100, what adopt the mode changing quantity to cause each single aperture 110 to become is very small, increases technology difficulty undoubtedly.
Fig. 6 is the present invention second preferred embodiment front view.In the present embodiment, shared by aperture 110 volume in cube structure unit 100 base material, the ratio of cubic units volume is identical, and aperture 110 quantity be single, cross sectional pattern, size are all identical, and in the present embodiment, aperture 110 size is greater than the size of aperture 110 in the first embodiment second execution mode.In the present embodiment, be filled with all kinds of media of refractive index random distribution in each aperture 110, such as iodine crystal, cupric oxide, crystal, quartz, polystyrene, sodium chloride, glass, air etc.In Fig. 6, the medium that the shadow representation in aperture 110 is filled, the refractive index of this filled media of the larger expression of hatching density is larger.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (8)
1. the diffuse device based on Meta Materials, it is characterized in that: comprising: Meta Materials and the reflector be arranged in this Meta Materials side, electromagnetic wave is refracted again by reflective surface after the change direction of propagation through Meta Materials, is again also again refracted through Meta Materials by the electromagnetic wave reflected; This Meta Materials is formed by stacking along three-dimensional by multiple cube structure unit, one or more apertures that this cube structure unit comprises base material and formed in the substrate, shared by aperture, the volume of cube structure unit is random distribution, the dielectric constant of each cube structure unit and magnetic permeability random distribution, this cube structure cell size is less than 1/5th of the electromagnetic wavelength of required response.
2., as claimed in claim 1 based on the diffuse device of Meta Materials, it is characterized in that: this base material is made up of ceramic material, macromolecular material, ferrite material or ferromagnetic material.
3. as claimed in claim 1 based on the diffuse device of Meta Materials, it is characterized in that: in this cube structure unit base material each, the upper little hole number formed is identical or different.
4., as claimed in claim 1 based on the diffuse device of Meta Materials, it is characterized in that: in those apertures, be filled with the medium that refractive index is identical or different.
5., as claimed in claim 4 based on the diffuse device of Meta Materials, it is characterized in that: in those apertures, be filled with air.
6. as claimed in claim 1 based on the diffuse device of Meta Materials, it is characterized in that: the volume of cube structure unit shared by those apertures is all identical and be filled with the medium of refractive index random distribution in those apertures.
7., as claimed in claim 1 based on the diffuse device of Meta Materials, it is characterized in that: this reflecting surface is made up of metal material.
8., as claimed in claim 1 based on the diffuse device of Meta Materials, it is characterized in that: those apertures are this cube structure unit through.
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| CN201110111718.4A CN102760956B (en) | 2011-04-29 | 2011-04-29 | Diffuse reflecting device based on metamaterial |
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| CN201110111718.4A CN102760956B (en) | 2011-04-29 | 2011-04-29 | Diffuse reflecting device based on metamaterial |
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| CN102760956B true CN102760956B (en) | 2014-12-24 |
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| CN107910651B (en) * | 2017-11-07 | 2020-06-09 | 齐齐哈尔大学 | Low-loss electromagnetic induction transparent all-dielectric metamaterial structure insensitive to polarization and incident angle |
| CN116354306B (en) * | 2023-01-12 | 2024-01-26 | 中恩光电科技（苏州）有限公司 | MEMS packaging optical phased array chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009132215A2 (en) * | 2008-04-23 | 2009-10-29 | Ravenbrick, Llc | Glare management of reflective and thermoreflective surfaces |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009132215A2 (en) * | 2008-04-23 | 2009-10-29 | Ravenbrick, Llc | Glare management of reflective and thermoreflective surfaces |
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