CN203398306U - Surface plasmon lens based on artificial electromagnetic material - Google Patents
Surface plasmon lens based on artificial electromagnetic material Download PDFInfo
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- CN203398306U CN203398306U CN201320442246.5U CN201320442246U CN203398306U CN 203398306 U CN203398306 U CN 203398306U CN 201320442246 U CN201320442246 U CN 201320442246U CN 203398306 U CN203398306 U CN 203398306U
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- artificial electromagnetic
- electromagnetic material
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- shaped sheet
- surface phasmon
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Abstract
The utility model discloses a surface plasmon lens based on an artificial electromagnetic material. The surface plasmon lens comprises a substrate, and surface metal structures which are arranged on the substrate and composed of structure units which are arranged periodically. The surface metal structure are in axial symmetry. Each structure unit comprises a U-shaped metal sheet. The groove depth of each U-shaped metal sheet is changed gradually to the outside along the symmetry axis. According to the utility model, electromagnetic waves can be regulated and controlled, the phase regulation and control of the lens on the surface plasmon can be realized; and through the zoom-in and zoom-out of structure parameters, the surface plasmon lens can be operated in different frequency bands, such as microwaves, millimeter waves, TeraHertz waves, etc.
Description
Technical field
The utility model relates to artificial composite material, especially a kind of lens that can regulate and control surface phasmon phase place.
Background technology
In optical band, metal has negative dielectric constant, and surface phasmon is present in metal surface; And at microwave, millimeter wave and terahertz wave band, metal has positive node constant, surface wave exists with the form of depressed Field ripple, and it fetters poor ability, makes to be difficult at microwave millimeter wave and terahertz wave band design surface wave device.
Novel artificial electromagnetic material be by have geometry in particular sub-wavelength elementary cell periodicity/aperiodicity arrange, or be implanted to a kind of artificial material that (or surface) forms in basis material body.The difference of novel artificial electromagnetic material and traditional sense material is just to have replaced original microscopic dimensions unit (atom or molecule) with macro-size unit.
The elementary cell of novel artificial electromagnetic material is generally the electricity/magnetic resonators of sub-wavelength dimensions, specifically can adopt metal resonance structure or perforated media substrate etc.In the process of research lens described in the utility model, find: because the characteristic of novel artificial electromagnetic material depends on its basic cell structure, can realize the not obtainable material parameter of traditional material by manual control resonant element, for surface wave device, material parameter is surface refractive index n.
Utility model content
Utility model object: the utility model will provide a kind of surface phasmon lens based on artificial electromagnetic material, to address the above problem, can propagate at microwave, millimeter wave and terahertz wave band surface phasmon; And the phase place that realizes lens effects on surface phasmon regulates and controls.
Technical scheme: a kind of surface phasmon lens based on artificial electromagnetic material, comprise substrate and be arranged on surface metal structure on described substrate, that formed by the construction unit of periodically arranging, described surface metal knot forms axial symmetry, described construction unit comprises U-shaped sheet metal, and the groove depth of U-shaped sheet metal is along symmetry axis gradual change laterally.
Several U-shaped sheet metals are arranged in multirow along the direction that is parallel to symmetry axis.The groove depth that is positioned at the U-shaped sheet metal of same a line equates.The spacing that is positioned at the U-shaped sheet metal of same a line equates.The line space of adjacent lines equates.The groove depth that is positioned at the U-shaped sheet metal in different rows is different, and groove depth is from close symmetry axis to reducing gradually away from symmetry axis place.The dielectric-slab of described substrate for adopting polytetrafluoroethylene to make.
Beneficial effect: surface phasmon lens of the present utility model, can, by the adjustment of structural parameters, realize the phase place regulation and control at wave band effects on surface phasmons such as microwave, millimeter wave and Terahertzs; Lens of the present utility model also have stable performance, it is simple to make, technical maturity, price is not high and be convenient to the advantages such as popularization.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the schematic diagram of the utility model construction unit;
Fig. 3 a is the phase place variation of a cell distance in embodiment and the relation of the unit groove degree of depth; Fig. 3 b be the phase place of a cell distance change and groove depth in the distribution of different rows;
Fig. 4 a and Fig. 4 b are emulation and the contrast of test near field distribution.
Embodiment
As depicted in figs. 1 and 2, the surface phasmon lens of the utility model based on novel artificial electromagnetic material mainly comprise substrate 1 and surface metal structure 2.Surface metal knot forms axial symmetry, a plurality of construction units, consists of, and construction unit comprises U-shaped sheet metal 3.U-shaped sheet metal be take horizontal median axis and is arranged into several rows as benchmark; The U-shaped sheet metal groove depth that is positioned at same a line is equal, and the U-shaped sheet metal spacing being positioned in same a line is equal, and the spacing of adjacent lines equates; Be not positioned at groove depth in different rows not etc., groove depth near symmetry axis to reducing gradually away from symmetry axis place.The surface refractive index both sides graded profile of lens.
Surface phasmon can be propagated on artificial electromagnetic material, and the surface wave of TE pattern can be supported in the sheet metal unit that is to form lens, and the dispersion curve of this surface wave is similar to the surface phasmon of optical band.Therefore by this structurized unit, surface phasmon can be applied in the frequency range lower than optical band.
Fig. 2 is the schematic diagram of construction unit of the present utility model (artificial electromagnetic material unit), and it is the U-shaped sheet metal structure of etching on dielectric-slab, and the material of dielectric-slab is polytetrafluoroethylene material, and dielectric constant is 2.2.
In other embodiments, the surface refractive index of lens body is according to the structural parameters regulation and control of novel artificial electromagnetic material, said structure parameter comprise the length of U-shaped sheet metal unit and width, U-shaped sheet metal groove depth, be positioned at the spacing of the U-shaped sheet metal of same a line and the spacing of adjacent lines; In addition, can also carry out other designs to the Changing Pattern of above-mentioned groove depth.Different according to working frequency range, can adopt different processing technologys to realize.
In addition, because the utility model can be realized the medium parameter of gradual change, i.e. the surface refractive index of gradual change, this character can be for realizing surface phasmon lens antenna; In said structure, can design arranging of elementary cell, to obtain the lens that meet lens body refractive index demand, the PHASE DISTRIBUTION of control surface phasmon.
Forward Fig. 3 a and Fig. 3 b to, Fig. 3 a has showed surface phasmon that novel artificial electromagnetic material supports and has changed the relation with the degree of depth in the phase place of a cell distance along on lens horizontal axis.Because this phase place changes, be directly proportional to surface refractive index, by the surface refractive index that this phase place changes and the relation of the degree of depth can obtain designed surface phasmon lens, distribute.In Fig. 3 b
φ s line has showed from the novel artificial electromagnetic material of the different fore-and-aft distances of lens horizontal axis and has changed in the phase place of a cell distance, h line (dotted line) has showed from the groove depth of the novel artificial electromagnetic material unit of the different fore-and-aft distances of lens horizontal axis, is also the groove depth of U-shaped sheet metal.
By adopting different groove depths like this in the novel artificial electromagnetic material unit of different rows, realize the phase control of effects on surface phasmon.
Comparison diagram 4a and Fig. 4 b are visible: the near field distribution of emulation and the near field distribution of test have well coincide.
In a word, in order to realize at microwave, millimeter wave and terahertz wave band effects on surface phasmon, the distinctive electromagnetic response of artificial electromagnetic material for the utility model Tilly, can propagate at microwave, millimeter wave and terahertz wave band surface phasmon; And utilize it can regulate and control arbitrarily electromagnetic characteristic, realized the phase place regulation and control of lens effects on surface phasmon.By the convergent-divergent of structural parameters (length and the width that comprise construction unit, groove depth, the arrangement mode of the gradual change rule Deng， unit of groove depth), these lens are applicable to microwave, the different frequency ranges such as millimeter wave and THz wave.
The utility model by filling the artificial electromagnetic material with certain regularity of distribution that meets theory of geometric optics or optical transformation theory in space, and by Qi space waveguiding action, be controlled at the phase place of the ripple in material, realize lens directional transmissions or converge.In addition, optical transform can also freely be controlled the profile of lens, thereby obtains small size lenticular lens array easy of integration, to meet the specific requirement of different system.
The above is only preferred implementation of the present utility model; be noted that for those skilled in the art; do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (7)
1. surface phasmon lens based on artificial electromagnetic material, it is characterized in that, comprise substrate (1) and be arranged on surface metal structure on described substrate, that formed by the construction unit of periodically arranging (2), described surface metal knot forms axial symmetry, described construction unit comprises U-shaped sheet metal (3), and the groove depth of U-shaped sheet metal is along symmetry axis gradual change laterally.
2. the surface phasmon lens based on artificial electromagnetic material as claimed in claim 1, is characterized in that, several U-shaped sheet metals are arranged in multirow along the direction that is parallel to symmetry axis.
3. the surface phasmon lens based on artificial electromagnetic material as claimed in claim 2, is characterized in that, the groove depth that is positioned at the U-shaped sheet metal of same a line equates.
4. surface phasmon lens based on artificial electromagnetic material as claimed in claim 2 or claim 3, is characterized in that, the spacing that is positioned at the U-shaped sheet metal of same a line equates.
5. the surface phasmon lens based on artificial electromagnetic material as claimed in claim 2, is characterized in that, the line space of adjacent lines equates.
6. the surface phasmon lens based on artificial electromagnetic material as claimed in claim 2, is characterized in that, the groove depth that is positioned at the U-shaped sheet metal in different rows is different, and groove depth is from close symmetry axis to reducing gradually away from symmetry axis place.
7. the surface phasmon lens based on artificial electromagnetic material as claimed in claim 1, is characterized in that, the dielectric-slab of described substrate for adopting polytetrafluoroethylene to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320442246.5U CN203398306U (en) | 2013-07-23 | 2013-07-23 | Surface plasmon lens based on artificial electromagnetic material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320442246.5U CN203398306U (en) | 2013-07-23 | 2013-07-23 | Surface plasmon lens based on artificial electromagnetic material |
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| CN201320442246.5U Expired - Lifetime CN203398306U (en) | 2013-07-23 | 2013-07-23 | Surface plasmon lens based on artificial electromagnetic material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390800A (en) * | 2013-07-23 | 2013-11-13 | 东南大学 | Surface plasmon lens based on artificial electromagnetic material |
| CN106940296A (en) * | 2017-03-14 | 2017-07-11 | 南京大学 | A kind of grade based on nano-pattern is from primitive index sensor and its method for sensing |
-
2013
- 2013-07-23 CN CN201320442246.5U patent/CN203398306U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390800A (en) * | 2013-07-23 | 2013-11-13 | 东南大学 | Surface plasmon lens based on artificial electromagnetic material |
| CN103390800B (en) * | 2013-07-23 | 2015-07-01 | 东南大学 | Surface plasmon lens based on artificial electromagnetic material |
| CN106940296A (en) * | 2017-03-14 | 2017-07-11 | 南京大学 | A kind of grade based on nano-pattern is from primitive index sensor and its method for sensing |
| CN106940296B (en) * | 2017-03-14 | 2019-03-22 | 南京大学 | A kind of equal method for sensing from primitive index sensor based on nano-pattern |
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Granted publication date: 20140115 |