CN105629364A - Wavelength selection type super surface device - Google Patents
Wavelength selection type super surface device Download PDFInfo
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- CN105629364A CN105629364A CN201610195282.4A CN201610195282A CN105629364A CN 105629364 A CN105629364 A CN 105629364A CN 201610195282 A CN201610195282 A CN 201610195282A CN 105629364 A CN105629364 A CN 105629364A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/204—Filters in which spectral selection is performed by means of a conductive grid or array, e.g. frequency selective surfaces
Abstract
The invention discloses a wavelength selection type super surface device and belongs to the metamaterial technical field. The wavelength selection type super surface device includes a substrate and a super surface which are successively arranged from bottom to top, wherein the super surface is composed of anisotropic nano unit structural arrays; the super surface includes a plurality of electromagnetic regions; the shapes and sizes of the nanostructures at the same electromagnetic region are identical; the shapes of the nanostructures at different electromagnetic regions are different or the shapes of the nanostructures at different electromagnetic regions are identical but the sizes of the nanostructures at the different electromagnetic regions are different; the nano structural array at each electromagnetic region only generates preset electromagnetic response to electromagnetic waves of specific wavelengths, so that wavelength selection can be realized. With the device of the invention adopted, incident light of different wavelengths can generate OAM (orbital angular momentum) of different topological charges. An ultrathin multi-wavelength optical device designed based on the wavelength selection type super surface device of the invention can be widely applied to wireless communication systems in the future.
Description
Technical field
The present invention relates to Meta Materials research field, particularly relate to a kind of super surface device of wavelength chooses type.
Background technology
Along with the development of the communication technology, due to the limitation of routine coding and Channel Technology, the capacity of traditional fibre system and spectrum effectiveness, close to the limit, cannot meet the demand transmitting a large amount of information, moreover, its security sending data also faces stern challenge. In order to address this problem, further lifting system capacity and spectrum effectiveness, revolutionary innovative technology explored by the demand needs that meeting following mobile data services transmission data increases day by day. The research of orbital momentum (OAM) technology in recent years receives much concern, due to the security of good orthogonality and beared information, make it can transmit multi-channel electromagnetic whirlpool ripple on same carrier frequency, improved capacity and the security of transmission information by coded message and multiplexing technique, such as OAM may be used for transfer, can carry out too bit scale in a fiber multiplexed of too bit freeboard and carries out information transmission at freeboard. Therefore OAM application in wireless communications has started worldwide research boom.
In order to make OAM play bigger effect in communication system, the device of switching OAM pattern arises at the historic moment fast, the device of typical switching and regulation and control OAM light beam comprises spiral optical modulation, Q-plate, computer-generated hologram figure and circular grating, but above device is due to size inconvenient quick adjustment OAM pattern relatively greatly. Therefore, research and development produce the miniaturized optical device with conversion OAM light beam is necessary in future optical communicates. Recently, two-dimensional material is super surperficial as a new planar optical device, it is proved the shape by changing its structural unit and position angle can be used to regulate phase distribution, the super surface of all kinds that the array arranged by modular construction is formed can produce OAM light beam under linear polarization and circularly polarized light incidence, but can not change under the incident electromagnetic wave of different wave length irradiates. Therefore, how utilizing a kind of optics to produce different OAM light beams and how a large amount of OAM light beams is carried out effective separation is the huge challenge that current technology faces with detection.
Summary of the invention
Technical problem to be solved by this invention is, for the deficiencies in the prior art, a kind of super surface device of wavelength chooses type is provided, described super surface comprises multiple electromagnetism region, the hertzian wave being incident to this region is only produced the electromagnetic response preset by each electromagnetism region, thus achieves the selectivity to wavelength.
The present invention solves the technical scheme of its technical problem employing: a kind of super surface device of wavelength chooses type, the super surface comprising the substrate arranged successively from bottom to top and be made up of anisotropy nanocell structures array, described super surface comprises multiple electromagnetism region, the nanostructure shape in same electromagnetism region is identical with size, the nanostructure shape in different electromagnetism region is different or the identical size of shape is different, namely the hertzian wave being incident to this region is only produced default electromagnetic response by the nano-pore structure array in each electromagnetism region, described anisotropy nanostructure is etched on super thin metal or medium, also can directly be produced in substrate, its characteristic dimension is less than wavelength, arrangement pitches is less than half-wavelength, the span of wherein said super thin metal its thickness Tg is: �� < Tg < ��/15 (�� is lambda1-wavelength, and �� is the skin depth of metal,��0=4 �� �� 10-7H/m, �� are circular frequency, ��0Specific conductivity for metal); Described ultra-thin medium thickness is less than lambda1-wavelength.
Wherein, described super surface is plane or curved surface.
Wherein, described anisotropy nanostructure comprises: hole or its complementary structure.
Wherein, described anisotropy nanostructured pattern comprises: rectangle, ellipse, cruciform, I-shaped or Polygons.
Wherein, described metal comprises: gold and silver, copper, au-alloy, silver alloys or copper alloy.
Wherein, described medium comprises: the semi-conductor such as silicon, silicon-dioxide and fluorochemical etc. are at the transparent material of service band.
Wherein, described base material is the semi-conductor such as silicon, silicon-dioxide and fluorochemical etc. at the transparent material of service band.
Wherein, if described nanoporous modular construction is produced on medium, dielectric material and base material may be the same or different.
Wherein, described substrate thickness 0 < Ts < ��, �� is lambda1-wavelength.
Wherein, described substrate surface is plane or curved surface.
Wherein, the thickness T of the super surface device of described wavelength selectivity can be less than wavelength.
Wherein, the super surface device of described wavelength selectivity is applicable to visible ray and near infrared region.
Compared with prior art, the useful effect of the present invention is:
The present invention produces by designing the light of selective permeable different wave length cleverly and focuses on different OAM light beams, and inventive design is novel, and volume is little, and weight is light, and wireless communication technology field has enlightening significance and application prospect widely.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention;
Fig. 2 is wavelength and the graph of a relation of transmissivity and nano-pore structure cell size;
Fig. 3 is the schema of the present invention;
Fig. 4 is through the electromagnetism distributed simulation result of conversion and the OAM light beam of focusing under different wave length;
Fig. 5 is the fringe pattern of the OAM light beam of RCP light and focusing under different wave length;
Fig. 6 is the scanning electron microscope (SEM) photograph of sample of the present invention;
Fig. 7 is Sample testing device figure of the present invention;
Fig. 8 is sample tests figure of the present invention.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the present invention is described in detail, but protection scope of the present invention is not limited in embodiment below, should comprise the whole contents in claim book. And those skilled in the art can realize the whole contents claim from following embodiment.
The embodiment of the present invention 1 is for preferred rectangle nanoporous modular construction, and as shown in Figure 1, this super surface of wavelength chooses type comprises the substrate 1, super surperficial 2 arranged successively from bottom to top. Described super surface is arranged in array by the two kinds of rectangle nanoporouss 3,4 in gold thin film according to certain way and forms. Wherein substrate thickness is Ts; The thickness of gold thin film is Tg; Rectangle nanoporous 3 is w1 along the width of x-axis, and the length along y-axis is L1, and the cycle is p1; Rectangle nanoporous 4 is w2 along the width of x-axis, and the length along y-axis is L2, and the cycle is p2.
The making of the super surface device of wavelength chooses type of the present invention and the concrete grammar of parameter optimization are as follows:
(1) determine and optimize modular construction dimensional parameters. First the resonant properties of single nanoporous is inquired into, when left circularly polarized light (LCP) incides in nanoporous, can be exchanged into right-circularly polarized light (RCP). The max transmissive coefficient of the light being converted as shown in Figure 2 and resonance wavelength increase with the increase of the long L of rectangle nanoporous and rangeability bigger. But change wide w, it is converted that the variations in transmissivity of light is little and the raw blue shift of synchronous wave long hair. The resonant frequency that the size difference of known modular construction possesses is different, and then corresponding resonance wavelength is different, refers to Fig. 3. Considering the change that modular construction transmits in wavelength region, therefore conveniently design the nanoporous of two kinds of different sizes, parameters optimization is set as: incident LCP ��=930nm, w1=40nm, L1=200nm; Incident LCP ��=766nm, w2=80nm, L2=140nm.
(2) design is super surperficial. In order to make the super surface device that the LCP light of different wave length incides the present invention produce the OAM light beam of OAM light beam and focusing, predefine phase distribution function on super surface(wherein, k is wave vector, and r is the radius in polar coordinates, and f is focal length, and l is topology charge values,For direction angle), this phase distribution function is by the helical phase �� producing OAM light beam1=l �� and generation focus on the phase distribution of OAM light beamComposition. Two kinds of nano-pore structure unit are arranged according to the phase distribution mode of predefine, as shown in Figure 1.
(3) utilize simulation software that super surface carries out emulation test. Set Z=30 ��m, the LCP light of ��=930nm and ��=766nm is incident on respectively in nano-pore structure array 3 and 4 region. As shown in fig. 4 a, when the LCP light of ��=930nm is incident, creating the OAM light beam of the focusing of topology charge values l=1, Fig. 4 b and 4c is respectively its electric field distribution in x-axis, the component of y-axis. As shown in figure 4d, when the LCP light of ��=766nm incide super surperficial time, create the OAM that topology charge values is l=2 and focus on light beam, Fig. 4 e, 4f are respectively its electric field distribution in x-axis, the component of y-axis.
Further, linear polarization (LP) light is incident super surperficial, the RCP light that this LP is only interfered by the LCP light and generation that produce OAM light beam forms. The RCP light passed through and the OAM light beam of focusing interfere, by the whirlpool lobe number in the fringe pattern produced to determine the topological charge values of OAM light beam. Please refer to Fig. 5 a and 5b, incident super surperficial the produced fringe pattern of LP light of Fig. 5 a to be wavelength be 930nm, whirlpool lobe number is one, i.e. the topological charge values l=1 of OAM light beam. Incident super surperficial the produced fringe pattern of LP light of Fig. 5 b to be wavelength be 766nm, whirlpool lobe number is two, i.e. the topological charge values l=2 of OAM light beam.
(4) experimental verification. The super surperficial sample of the present invention is prepared according to above-mentioned principle of design, as shown in Figure 1, cleaning level and smooth quartz substrate utilize magnetron sputtering method to plate the golden film of a layer thickness Tg=50nm, focused ion beam lithography is utilized to prepare super surperficial sample in gold thin film, rectangle nanoporous 1 is along the wide w1=40nm of x-axis, along the long L1=200nm of y-axis, along the period p 1=400nm of diaxon; The wide w2=80nm of rectangle nanoporous 2, long L2=140nm, period p 2=400nm. Fig. 6 is the scanning electron microscope (SEM) photograph of sample. Sample testing device refers to Fig. 7.
Sample tests is as shown in Fig. 8 a-8f. Fig. 8 a and 8d be sample at distance Z=32 ��m, wavelength is under the LCP light incidence of 930nm and 766nm, create respectively topology charge values l=1 and l=2 OAM focus on light beam intensity distribution. Fig. 8 b and 8e be under Z=20 ��m of condition experimental result, it is seen that the present invention can be used for producing and focus on the OAM light beam of not homeomorphism charge values. Fig. 8 c and 5f is Z=23 ��m, under the incident condition of the LP light of two kinds of wavelength, and the OAM light beam of focusing and the fringe pattern of RCP light passed through, it is seen that topology charge values can be determined by the whirlpool lobe number in interferogram.
By the present embodiment it will be seen that test result and emulation result are very identical, illustrate that the present invention has the ability that OAM pattern carries out optics switching under different incident light irradiates. Thus demonstrate accuracy and the reliability of the present invention utilizing above-mentioned principle design.
By above-described embodiment, the present invention can be realized preferably.
Claims (12)
1. the super surface device of wavelength chooses type, it is characterized in that: make the incident light of different wave length produce and focus on the OAM (orbital momentum) of not homeomorphism lotus by the structure of described super surface device, the super surface that its structure comprises the substrate arranged successively from bottom to top and is made up of anisotropy nanocell structures array, described super surface comprises multiple electromagnetism region, the nanostructure shape in same electromagnetism region is identical with size, the nanostructure shape in different electromagnetism region is different or the identical size of shape is different, namely the hertzian wave being incident to this region is only produced default electromagnetic response by the nano-structure array in each electromagnetism region, wherein, described anisotropy nanostructure is etched on super thin metal or medium, also can directly be produced in substrate, its characteristic dimension is less than wavelength, arrangement pitches is less than half-wavelength, the span of wherein said super thin metal its thickness Tg is: �� < Tg < ��/15, �� are lambda1-wavelength, and �� is the skin depth of metal,��0=4 �� �� 10-7H/m, �� are circular frequency, ��0For the specific conductivity of metal; Described ultra-thin medium thickness is less than lambda1-wavelength.
2. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, described super surface is plane or curved surface.
3. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, described anisotropy nanostructure comprises: hole or its complementary structure.
4. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, described anisotropy nanostructure geometric scheme comprises: rectangle, ellipse, cruciform, I-shaped or Polygons.
5. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, described metal comprises: gold and silver, copper, au-alloy, silver alloys or copper alloy.
6. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, described medium comprises: the semi-conductor such as silicon, silicon-dioxide and fluorochemical etc. are at the transparent material of service band.
7. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, described base material is the semi-conductor such as silicon, silicon-dioxide and fluorochemical etc. at the transparent material of service band.
8. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, if described nanocell structures is produced on medium, dielectric material and base material may be the same or different.
9. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, described substrate thickness 0 < Ts < ��, �� is lambda1-wavelength.
10. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, described substrate surface is plane or curved surface.
11. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, the thickness T of the super surface device of described wavelength selectivity can be less than wavelength.
12. a kind of super surface device of wavelength chooses type according to claim 1, it is characterised in that, the super surface device of described wavelength selectivity is applicable to visible ray and near infrared region.
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| CN106383403A (en) * | 2016-12-08 | 2017-02-08 | 中国科学院光电技术研究所 | Super-surface color display device capable of realizing tensile deformation |
| CN106410418A (en) * | 2016-08-11 | 2017-02-15 | 东南大学 | Dual-functional anisotropic electromagnetic encoding metamaterial applied to microwave band, and basic unit structure and design method |
| CN107863827A (en) * | 2017-12-12 | 2018-03-30 | 江西沃格光电股份有限公司 | Microwave receiving device, microwave charging device, the preparation method of handheld terminal and super surface cap |
| CN107947391A (en) * | 2017-12-12 | 2018-04-20 | 江西沃格光电股份有限公司 | The preparation method of microwave transmission system, device and microwave antenna |
| CN108845412A (en) * | 2018-08-27 | 2018-11-20 | 上海理工大学 | Phase-plate design method in compact phasecontrast microscope |
| CN108873166A (en) * | 2018-06-28 | 2018-11-23 | 哈尔滨工程大学 | The dynamic regulation light field device on super structure surface is integrated on a kind of twin-core fiber |
| CN109716177A (en) * | 2016-09-15 | 2019-05-03 | 麦格纳国际公司 | Super surface lens component for chrominance separation |
| CN109814266A (en) * | 2019-03-07 | 2019-05-28 | 武汉邮电科学研究院有限公司 | A kind of laser shaping optical element and its design method |
| CN110954974A (en) * | 2019-11-27 | 2020-04-03 | 中国科学院光电技术研究所 | Full Stokes infrared polarization imager based on super surface |
| CN111641046A (en) * | 2020-05-07 | 2020-09-08 | 宁波大学 | Microwave band broadband circular dichroism chirality wave absorber |
| CN112859215A (en) * | 2020-12-31 | 2021-05-28 | 中国科学院光电技术研究所 | Quasi-continuous super-surface beam splitter of infrared band |
| CN112882369A (en) * | 2021-02-09 | 2021-06-01 | 北京理工大学 | Optical secret sharing method based on cascade metasurface holography |
| CN115493694A (en) * | 2022-11-16 | 2022-12-20 | 之江实验室 | Multispectral polarization imaging system and method based on optical super surface |
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| CN106410418A (en) * | 2016-08-11 | 2017-02-15 | 东南大学 | Dual-functional anisotropic electromagnetic encoding metamaterial applied to microwave band, and basic unit structure and design method |
| CN106410418B (en) * | 2016-08-11 | 2022-05-27 | 东南大学 | Dual-function anisotropic electromagnetic coding metamaterial applied to microwave band, basic unit structure and design method |
| CN109716177B (en) * | 2016-09-15 | 2024-01-30 | 麦格纳国际公司 | Super surface lens assembly for chromaticity separation |
| CN109716177A (en) * | 2016-09-15 | 2019-05-03 | 麦格纳国际公司 | Super surface lens component for chrominance separation |
| CN106383403A (en) * | 2016-12-08 | 2017-02-08 | 中国科学院光电技术研究所 | Super-surface color display device capable of realizing tensile deformation |
| CN106383403B (en) * | 2016-12-08 | 2020-11-10 | 中国科学院光电技术研究所 | Super-surface color display device capable of stretching and deforming |
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| CN108873166B (en) * | 2018-06-28 | 2020-07-28 | 哈尔滨工程大学 | Dynamic regulation and control optical field device of integrated superstructure surface on double-core optical fiber |
| CN108873166A (en) * | 2018-06-28 | 2018-11-23 | 哈尔滨工程大学 | The dynamic regulation light field device on super structure surface is integrated on a kind of twin-core fiber |
| CN108845412B (en) * | 2018-08-27 | 2020-07-17 | 上海理工大学 | Phase plate design method in compact phase contrast microscope |
| CN108845412A (en) * | 2018-08-27 | 2018-11-20 | 上海理工大学 | Phase-plate design method in compact phasecontrast microscope |
| CN109814266A (en) * | 2019-03-07 | 2019-05-28 | 武汉邮电科学研究院有限公司 | A kind of laser shaping optical element and its design method |
| CN109814266B (en) * | 2019-03-07 | 2021-03-23 | 武汉邮电科学研究院有限公司 | Laser shaping optical element and design method thereof |
| CN110954974B (en) * | 2019-11-27 | 2021-09-21 | 中国科学院光电技术研究所 | Full Stokes infrared polarization imager based on super surface |
| CN110954974A (en) * | 2019-11-27 | 2020-04-03 | 中国科学院光电技术研究所 | Full Stokes infrared polarization imager based on super surface |
| CN111641046A (en) * | 2020-05-07 | 2020-09-08 | 宁波大学 | Microwave band broadband circular dichroism chirality wave absorber |
| CN112859215A (en) * | 2020-12-31 | 2021-05-28 | 中国科学院光电技术研究所 | Quasi-continuous super-surface beam splitter of infrared band |
| CN112882369A (en) * | 2021-02-09 | 2021-06-01 | 北京理工大学 | Optical secret sharing method based on cascade metasurface holography |
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| CN115493694A (en) * | 2022-11-16 | 2022-12-20 | 之江实验室 | Multispectral polarization imaging system and method based on optical super surface |
| CN115493694B (en) * | 2022-11-16 | 2023-03-10 | 之江实验室 | Multispectral polarization imaging system and method based on optical super-surface |
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