CN106597578B - The windmill-shaped superstructure surface of crescent - Google Patents
The windmill-shaped superstructure surface of crescent Download PDFInfo
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- CN106597578B CN106597578B CN201611222888.9A CN201611222888A CN106597578B CN 106597578 B CN106597578 B CN 106597578B CN 201611222888 A CN201611222888 A CN 201611222888A CN 106597578 B CN106597578 B CN 106597578B
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- crescent
- windmill
- flabellum
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Abstract
A kind of windmill-shaped superstructure surface of crescent generating local composite polarizing light field.The substrate of the superstructure is optical medium material, and superstructure surface is windmill-shaped nanometer metal structure, is constituted by multiple flabellums are equiangularly arranged, and each flabellum is crescent.Incident laser energy is bound to superstructure surface by windmill-shaped structure, and finally generates local high field at each crescent flabellum tip；Since the flabellum of windmill is equiangularly arranged, while incident line polarisation can be converted to local composite polarizing.Change focusing points, enhancement factor and the local polarization state of flabellum number N and crescent factor m regulatable focusings field.The present invention can be used as polarization converter, particle manipulation waveguide, there is important application value to fields such as light field Polarization Modulation, nano-manipulations.
Description
Technical field
The invention belongs to optics and field of photoelectric technology, are related to light field Polarization Modulation, nano-manipulation, surface plasma and swash
Hair, especially a kind of novel windmill-shaped superstructure surface generating local composite polarizing light field.
Background technology
Super surface is one-dimensional or the Artificial plasma array in two-dimensional sub-wavelength period.Thickness due to super surface and operation
For wavelength compared to minimum, super surface can be considered as the non-continuous face for making incident light amplitude and phase mutate, therefore super surface
Regulate and control commonly used in light field, such as：Phase regulation and control, polarization regulation and control etc..Seldom consider in existing super study of surfaces in the world real simultaneously
Existing vectorial field local polarization regulation and control and the regulation and control of strong-focusing light field.Windmill-shaped superstructure surface in research related to the present invention
Fan blade of windmill shape type has：L-shaped, stick, plane set-hammer shape, Qian font, chirality of these researchs to windmill-shaped superstructure surface
Material property concern is more, seldom the vectorial field regulation and control on the super surface of concern.In terms of strong-focusing light field regulation and control, in the world some
Research group proposes crescent nanostructure, which is strapped in surface by incident laser energy and is generated at crescent tip high
Intensity focuses light field, and crescent nanostructure is not applied to windmill-shaped super surface.
Invention content
Purpose of the present invention is to solve the problems, such as to realize that Local Vector distribution of light intensity and polarization regulate and control simultaneously, provide a kind of novel
Generation local composite polarizing light field the windmill-shaped superstructure surface of crescent.The present invention creatively by crescent nanostructure with
Windmill-shaped super surface is combined, to realize the regulation and control of local vectorial field intensity and polarization simultaneously.
Technical solution of the present invention
The windmill-shaped superstructure surface of crescent of local composite polarizing light field can be generated, the superstructure is by substrate and windmill-shaped
Structure composite forms, and substrate is optical medium material, and superstructure surface is windmill-shaped nanometer metal structure, by N number of flabellum isogonism
Degree is arranged to make up, and each flabellum is crescent, and planar circumferential angle bisecting is N parts by N number of crescent structure flabellum.The crescent
The geometry of shape flabellum can be equivalent to the different cylinder interception of two section radius and obtain, wherein the big cylinder section center of circle
In small cylinder section edges, crescent flabellum is intercepted by cylinder 1 by cylinder 2, the section radius of two cylinders
Meet relational expression
Wherein m is defined as the crescent factor, and m >=2 and m are positive integer, R1For the section radius of cylinder 1, R2For cylinder
2 section radius, section distance of center circle
Medium substrate is cube structure, and size of foundation base is S × S × H, and wherein S is the length and width of substrate, the i.e. cross of substrate
Section is square, and H is the thickness of substrate.
Incident laser energy, can be bound to superstructure surface, and finally exist by the windmill-shaped superstructure surface of the crescent
Each crescent flabellum tip generates local high field；Since the flabellum of windmill is equiangularly arranged, while can be inclined by incident line
Light is converted into local composite polarizing.Change focusing points, the enhancement factor of flabellum number N and crescent factor m regulatable focusings field
And local polarization state.
The advantages and positive effects of the present invention：
Incident laser energy, can be bound to superstructure surface by the windmill-shaped superstructure surface of crescent provided by the invention, and
Finally local high field is generated at each crescent flabellum tip；Since the flabellum of windmill is equiangularly arranged, while can will be incident
Line polarisation be converted into local composite polarizing.Change the focusing points of flabellum number N and crescent factor m regulatable focusings field, increase
The strong factor and local polarization state.Meanwhile superstructure surface have be simple to manufacture, be advantageously integrated lumped component in body structure surface
Advantage.The present invention can be used as polarization converter, particle manipulation waveguide, have to fields such as light field Polarization Modulation, nano-manipulations important
Application value.
Description of the drawings
Fig. 1 is silica glass substrate and the compound composition of crescent windmill-shape metal structure can generate light in metal flat
Polarization change, flabellum tip can generate focus light field the windmill-shaped superstructure surface of four leaf crescents (with flabellum number N=4
For).Wherein：(a) be the windmill-shaped superstructure surface of crescent front view；(b) it is that the right side on the windmill-shaped superstructure surface of crescent regards
Figure；(c) be the windmill-shaped superstructure surface of crescent vertical view；(d) be crescent blade structure geometric representation.
When Fig. 2 is linear polarization visible light wave range Gaussian beam vertical incidence, the windmill-shaped superstructure surface metal plane of crescent
The direction of light field polarization (by taking flabellum number N=4, crescent factor m=2 as an example).Wherein：(a) it is the windmill-shaped superstructure table of crescent
Face metal flat electric field polarization direction；(b) it is the windmill-shaped superstructure surface metal flat magnetic field polarization direction of crescent.
When Fig. 3 is linear polarization visible light wave range Gaussian beam vertical incidence, the windmill-shaped superstructure surface metal flabellum of crescent
The focusing distribution of light intensity distribution schematic diagram that tip generates.Wherein：(a) distribution of light intensity distribution schematic diagram is focused when being N=2, m=2；
(b) distribution of light intensity distribution schematic diagram is focused when being N=4, m=2；(c) distribution of light intensity distribution signal is focused when being N=7, m=2
Figure；(d) distribution of light intensity distribution schematic diagram is focused when being N=4, m=3.
Specific implementation mode
Embodiment 1
As shown in Figure 1, the windmill-shaped superstructure surface of crescent provided by the invention, the superstructure is by medium substrate and windmill-shape
The flabellum of the compound composition of metal structure, windmill-shaped metal structure is crescent structure, and flabellum number is N, and windmill-shaped structure is by crescent
Shape structure is angularly arranged to make up with direction of rotation, is N parts by planar circumferential angle bisecting.Medium substrate is cube structure,
Size of foundation base is S × S × H, and wherein S is the length and width of substrate, and H is the thickness of substrate.The geometry of crescent flabellum can wait
It imitates and is obtained in two cylinder interceptions, the section radius of the cylinder 1 and cylinder 2 that intercept crescent shape meets relational expression
Wherein m is defined as the crescent factor, and m >=2 and m are positive integer, R1For the section radius of cylinder 1, R2For cylinder
2 section radius, section distance of center circle
Opposite target magnetically controlled DC sputtering and focused ion can be used in the making on the windmill-shaped superstructure surface of crescent in the present invention
Beam lithographic technique is realized.It is as follows：
(1) it is sputtered in the glass substrates such as quartz or in the semiconductor substrates such as silicon using opposite target DC magnetron sputtering method
Gold, silver, aluminium, copper etc. receive metal film；
(2) metal crescent windmill is etched on metal film receiving using focused-ion-beam lithography technology or direct electronic beam writing technology
Type structure.
Concrete application example 1
The design parameter on the windmill-shaped superstructure surface of crescent is as follows：
Media substrate materials are silica glass, and the windmill-shaped metal material of crescent is silver-colored, incident wavelength λ=600nm, this
When ag material refractive index nAg=0.04741+4.0419i, silica glass refractive index ng=1.5163+1.0566 × 10-8i。
Size of foundation base is 300nm × 300nm × 80nm, and fan blade of windmill number is N=4, and windmill-shaped metal is angularly distributed new by four
The moon, shape metal was constituted, and crescent form of metal can be equivalent to cylinder 1 and be intercepted and obtained by cylinder 2, crescent factor m=2, material
Material chooses R1=50nm, then R2≈ 71nm, section distance of center circle d=50nm.Incident light is linear polarization Gaussian beam, electric field polarization
Direction is identical as positive direction of the x-axis in Fig. 1 (c), and magnetic field polarization direction is identical as positive direction of the y-axis in Fig. 1 (c).
When Fig. 2 is linear polarization visible light wave range Gaussian beam vertical incidence, crescent windmill-shape superstructure surface metal plane
The direction of light field polarization (by taking flabellum number N=4, crescent factor m=2 as an example).Wherein：(a) it is the windmill-shaped superstructure table of crescent
Face metal flat electric field polarization direction, polarization direction are radial direction of polarisation；(b) it is the windmill-shaped superstructure surface metal of crescent
Flat magnetic field polarization direction, polarization direction is vertical with electric field polarization direction, is angular polarization direction.
When Fig. 3 is linear polarization visible light wave range Gaussian beam vertical incidence, the windmill-shaped superstructure surface metal flabellum of crescent
The focusing distribution of light intensity distribution schematic diagram that tip generates.Wherein：(a) distribution of light intensity distribution signal is focused when being flabellum number N=2
Figure；(b) distribution of light intensity distribution schematic diagram is focused when being flabellum number N=4；(c) distribution of light intensity distribution is focused when being flabellum number N=7
Schematic diagram；(d) distribution of light intensity distribution schematic diagram is focused when being N=4, m=3.Windmill-shaped metal structure central absorbent Light Energy,
And generate high intensity local focousing field at windmill-shaped each crescent flabellum tip.When flabellum number N changes, focousing field focus point
Number and enhancement factor can change；When crescent factor m changes, since m increases can cause crescent metal inner curve bent
Rate increases, and increases so as to cause thickness, and then enhancement factor can increase with m and be reduced.Therefore, change flabellum number N and crescent
Focusing points, enhancement factor and the local polarization state of factor m regulatable focusings field.
In the surface phasmon of windmill-shaped metal structure surface excitation, propagated to top along crescent blade surface,
Nano-focusing light field is formed on top.The windmill-shaped superstructure surface of four leaf crescents, windmill-shaped superstructure is by incident optical energy
Amount is bound to superstructure surface, and finally generates local high field at each crescent flabellum tip；Due to the flabellum isogonism of windmill
Degree arrangement, while incident line polarisation can be converted to local composite polarizing.It is adjustable to change flabellum number N and crescent factor m
Control focusing points, enhancement factor and the local polarization state of focousing field.The present invention can be used as polarization converter, particle manipulation wave
It leads, there is important application value to fields such as light field Polarization Modulation, nano-manipulations.
Claims (3)
1. a kind of windmill-shaped superstructure surface of crescent generating local composite polarizing light field, it is characterised in that the substrate of the superstructure
For visible light wave range typical media material, superstructure surface is windmill-shaped nanometer metal structure, by the equiangularly arranged structure of N number of flabellum
At each flabellum is crescent, and planar circumferential angle bisecting is N parts by N number of crescent structure flabellum；The crescent flabellum
Geometry can be equivalent to the different cylinder interception of two section radius and obtain, and the superstructure surface is inclined in visible light wave range line
It works when Gaussian beam of shaking is as incident light.
2. the windmill-shaped superstructure surface of crescent according to claim 1, it is characterised in that the crescent flabellum is by cylinder
Body 1 is intercepted by cylinder 2, and the section radius of two cylinders meets relational expression
Wherein m is defined as the crescent factor, and m >=2 and m are positive integer, R1For the section radius of cylinder 1, R2For cylinder 2
Section radius, section distance of center circle are
3. the windmill-shaped superstructure surface of crescent according to claim 1 or 2, it is characterised in that windmill-shaped superstructure will be incident
Light energy is bound to superstructure surface, and finally generates local high field at each crescent flabellum tip；Due to the flabellum of windmill
It is equiangularly arranged, while incident line polarisation can be converted to local composite polarizing；Change flabellum number N and crescent factor m
The focusing points, enhancement factor and local polarization state of focousing field can be regulated and controled.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611222888.9A CN106597578B (en) | 2016-12-27 | 2016-12-27 | The windmill-shaped superstructure surface of crescent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611222888.9A CN106597578B (en) | 2016-12-27 | 2016-12-27 | The windmill-shaped superstructure surface of crescent |
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| CN106597578A CN106597578A (en) | 2017-04-26 |
| CN106597578B true CN106597578B (en) | 2018-10-26 |
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| CN106990547B (en) * | 2017-05-16 | 2021-08-13 | 南开大学 | Dolphin-shaped cellular circle array super surface |
| CN107290826B (en) * | 2017-07-26 | 2019-12-03 | 江苏大学 | A kind of Two dimensional square lattice photon crystal structure with big TM forbidden band based on windmill-shaped defect |
| CN108363129A (en) * | 2018-04-20 | 2018-08-03 | 南开大学 | More structure combinatorial artificial resistance electromagnetic surfaces |
| CN110261951A (en) * | 2019-07-04 | 2019-09-20 | 南开大学 | High performance surface enhances the circular polarization dichroics and method of chiral optic response |
| CN110568624B (en) * | 2019-08-15 | 2021-06-04 | 复旦大学 | Polarization conversion device based on angular dispersion principle |
| CN112928418B (en) * | 2021-03-12 | 2022-06-10 | 南通大学 | Fan-shaped loaded sub-terahertz dielectric waveguide |
| CN113885118A (en) * | 2021-11-01 | 2022-01-04 | 觉芯电子(无锡)有限公司 | Chiral optical element and preparation method thereof |
| CN114779373B (en) * | 2022-03-14 | 2024-03-26 | 清华大学 | Optical power beam splitter and method for manufacturing the same |
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| CN103954363B (en) * | 2014-04-24 | 2016-05-18 | 浙江工业大学 | A kind of circularly polarized light detector and manufacture method thereof |
| CN104965243B (en) * | 2015-06-16 | 2017-07-11 | 南京大学 | It is a kind of that the flat-plate lens that plane wave is focused on are realized using super structure surface |
| CN105044814B (en) * | 2015-08-03 | 2017-07-04 | 欧阳征标 | A kind of meta-material thin film of right-hand circular polarization conversion |
| CN105866981A (en) * | 2016-04-20 | 2016-08-17 | 中国科学院光电技术研究所 | Broadband electromagnetic wave phase modulating method and super-surface sub-wavelength structure |
| CN106200012B (en) * | 2016-07-14 | 2018-11-20 | 浙江工业大学 | A kind of chiral superstructure using metal silicide |
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