CN109270606A - A method of dynamic multifocal super lens are constructed based on medium and graphene - Google Patents
A method of dynamic multifocal super lens are constructed based on medium and graphene Download PDFInfo
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- CN109270606A CN109270606A CN201811165610.1A CN201811165610A CN109270606A CN 109270606 A CN109270606 A CN 109270606A CN 201811165610 A CN201811165610 A CN 201811165610A CN 109270606 A CN109270606 A CN 109270606A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
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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
- G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
Abstract
The method based on medium and graphene construction dynamic multifocal super lens that the invention discloses a kind of.Step of the present invention: (1) 0.7um~500um infrared wavelength range in, to different wave length incident light according to the positional relationship of focus and wavelength, phase gradient distribution on the super surface of calculation medium；(2) different cycles structure is designed to every kind of central wavelength, determines specific phase value in conjunction with phase gradient distribution and Pancharatnam-Berry phase；(3) basic unit of the column structure for determining height as the super surface of medium is designed, corresponding specific implementation structure and rotation direction are redesigned；(4) reflection-type condenser lens is constituted with multi-layer graphene in base part, and the fermi level by changing graphene is come the position of dynamic regulation focus point.The present invention realizes the effect of dynamic multifocal mirror lens by the super surface of medium and multi-layer graphene structure, and has many advantages, such as that efficient focusing function and ultra wide band, dynamic is adjustable, is easily integrated.
Description
(1) technical field
The method based on medium and graphene construction dynamic multifocal super lens that the present invention relates to a kind of, belongs to geometry
Optics and micronano optical field.
(2) background technique
Super surface is as a kind of sub-wavelength structure being arranged in two-dimensional surface, due to can locally change incident beam
The specific function of amplitude, polarization and phase, is rapidly developed.Also result in people's hereby based on the lens that super surface is designed
Extensive concern, different from conventional lenses, this super surface optical lens is based on optical nano material, therefore relatively light.When super table
When the sub-wavelength nanostructure in face forms specific repeat pattern, they can simulate the complex curvatures of refracted light, but without that
It is heavy, and in the case where reducing distortion, the ability of focusing light is improved.But, most of such nanostructures
Equipment is static, therefore limits their functionality.On the basis studied lens, the present invention utilizes Multi-layer graphite
Alkenyl bottom proposes a kind of a kind of dynamic multifocal mirror lens on lens principle.
It is calculated by the design to super surface texture, we are designed using popular super sufacing based on multilayer herein
The shortcomings that adjustable dieletric reflection super lens of multifocal dynamic of graphene, which overcome traditional optical components, have ultra-thin
Ultralight, two-dimensional surface, structure are simple, function is extensive and focus when can control all projectile energies the advantages of, preferably
It improves spatial resolution and thickness reaches micron dimension.The multifocal dynamic focusing that it has the function of is in integrated optics system
With very extensive application prospect.And this micro-nano mirror lens, which overcomes, completes the disadvantage that then focus is fixed in structure design
End, the fermi level by adjusting graphene-based bottom can dynamically adjust focal position and substantially increase reflection condenser lens
Practicability.
(3) summary of the invention
The purpose of the present invention is to provide it is a kind of it is simple and compact for structure, be easily integrated, practical based on medium and more
The method of the multifocal point reflection super lens of layer graphene construction dynamic.
The object of the present invention is achieved like this:
Step (1) is in the infrared wavelength bandwidth of operation of 0.7um~500um, first according to super surface to the special of light wave
Regulation, at different wavelengths with the super surface knot of periodicity of the rotation oscillator of the cycle design response different wave length incident light of needs
Structure；
Step (2) for every kind of central wavelength, according to required focus and nanocell structures regulation phase mechanism with
Different focusing requirement formula and lens aplanatism principle under different wave length, the phase gradient distribution on the super surface of calculation medium；
Step (3) designs basic unit of the column structure for determining height as the super surface of medium, by obtained phase ladder
The periodic structure on the degree distribution super surface of binding medium, according to the phase requirements and Pancharatnam- of each basic unit
Berry phase adjusts the Space Rotating angle of each cellular construction to obtain required phase distribution；
Step (4) application multi-layer graphene carries out the reflection of high reflectance and passes through to change stone as substrate to incident light
The fermi level of black alkene provides required additive phase for reflected light, realizes to the dynamic regulation of reflective phase, is not changing
The case where super surface texture, which gets off, dynamically changes bifocal focal position；
By the parameter of reasonable design cell structure, each column structure on super surface is equivalent to a half-wave
Phase-shifter, it can convert most incident circularly polarized light to its orthogonal polarisation state.Left-hand circular polarization incident electromagnetic wave
After surpassing the interaction of structure surface texture with anisotropy, its reflection orthogonal polarisation state electromagnetic wave, which carries, contains no phase
The original spin phase moved and the conversion phase bit position (referred to as Pancharatnam-Berry phase) with induction phase shift, it is this
Additional phase is ± 2 θ, and wherein θ is the azimuth of super surface texture.Multi-layer graphene substrate also generates reflected light attached simultaneously
Add phase, realization is further tuned original structure reflected phase.
The aplanatism principle of lens in the step (2), for any focus F (x1,y1,z1), super surface phase should expire
Foot:
The phase that exactly super surface should meet, wherein x, y are the coordinate points on super surface, and λ is incident light
Wavelength.Wherein, " ± " indicates the rotation direction of incident light.By (1) formula it is found that required rotation angle it is positive and negative dependent on incident light
Rotation direction.Determine the phase of each different locationThe phase distribution on entire multi-focus lens is determined that.Separately
Outside, after super surface structure design determines, by changing the fermi level of multi-layer graphene substrate so as to reflected light
Additive phase is provided dynamically to regulate and control the focal position of this multifocal mirror lens.
Making planar light beam that can focus very important point after through super surface in the present invention is exactly reflected phase
It being capable of steady change of the ground comprising 0-2 π.And phase distribution is controlled by the rotation angle of super surface basic cell structure, institute
It is exactly the analysis of the rotation angle to cellular construction with the key that can be focused.
Preferably, a kind of method based on medium and graphene construction dynamic multifocal super lens, feature exist
In selected light wave wave-length coverage in infrared wavelength range, according to the optical characteristics of graphene in this wave band, graphite
The surface conductivity of alkene influenced by chemical potential it is bigger, chemical potential increase when, surface conductivity is significantly increased, this is electromagnetic wave
Reflection biggish reflectivity is provided.
Preferably, a kind of method based on medium and graphene construction dynamic multifocal super lens, feature exist
In the material characteristics of the column structure of the selection are as follows: low and loss high in service band dielectric constant includes silicon nitride, phosphorus
Change transfers, titanium dioxide, silicon etc..
Preferably, a kind of method based on medium and graphene construction dynamic multifocal super lens, feature exist
The column structure described in the step (3) includes four side column shapes, triangle column, hexagonal column shape and cylindric, cylindroid
Shape etc..
Beneficial effect is: the present invention take full advantage of designed super surface texture under different-waveband different responses and
The phase compensation characteristic of the high reflectance of substrate multi-layer graphene, so that in the case where super surface high-transmission rate high conversion,
Light can be reflected away when light reaches substrate with high reflectance, overcome previous reflection-type condenser lens and use metal
Material makees energy loss problem caused by substrate, substantially increases the conversion ratio and focusing efficiency of light wave, by adjusting graphite
The fermi level of alkene can dynamically adjust the focal position of focus, so as to form high reflectance, wide band, focus is adjustable
Multifocal reflection lens, the multi-focus lens of this focus adjustable can be used for the range measurement of multiple objects, passes through multilayer stone
Under black alkene difference fermi level different focal lengths can be at clearly as having achieved the purpose that dynamic distance.
(4) Detailed description of the invention
Fig. 1 is the right-circularly polarized light that left circularly polarized light (LCP) is incident on the back reflection on multifocal mirror lens
(RCP) schematic diagram.
Fig. 2 be after left-hand circular polarization light is incident after designed mirror lens in the multifocal of incident ipsilateral formation
Schematic diagram.
Fig. 3 is the response different wave length on multifocal mirror lens, and the different structure array plane of corresponding different focal point is shown
It is intended to, w, l, h respectively indicate width, length, the height of three kinds of structures.
Fig. 4 is the emulation focal length value under graphene difference fermi level at infrared wavelengths.
Fig. 5 is that the multifocal two dimension formed after being emulated with simulation software to overall structure and three-dimensional artificial are illustrated
Figure.
(5) specific embodiment
A specific embodiment of the invention is described further below in conjunction with attached drawing.
A method of dynamic multifocal super lens are constructed based on medium and graphene, specifically includes the following steps:
Step (1) is in the infrared wavelength bandwidth of operation of 0.7um~500um, according to super surface texture to the special of light wave
Modulation, research can generate the super surface texture and size of response to different-waveband.By the rational design to cellular construction, such as
Shown in Fig. 1, at infrared wavelengths left-handed circular polarized wave (LCP) impinge perpendicularly on by SiO2 dielectric layer, multi-layer graphene substrate and
When on the super surface of medium for the cellular construction composition that service band dielectric constant is high and loss is low, since designed super surface is tied
The polarization characteristic and focus characteristics of structure and the high reflection characteristic of substrate multi-layer graphene, when light surpasses by designed
When surface texture, the light wave for generating two different polarization directions, right-hand circular polarization (RCP) and Left-hand circular polarization (LCP) can be reflected,
And the right-circularly polarized light opposite with incident light polarization state is focused, to more under super surface different cycles structure function
A wavelength generates different focus points.1,2,3 structures in Fig. 3 respond near infrared band, middle infrared band and far infrared wave respectively
Section forms focus.Response different-waveband refers to: super surface texture can convert incident light into and incidence in different-waveband respectively
The opposite reflected light of polarization state, and each super surface texture only can be by a spectrum conversion, influencing each other can ignore not
Meter.
Step (2) calculates cellular construction phase distribution according to required focal position, using lens aplanatism principle
And according to the form arrangement units structure of Fig. 3.According to lens focus, each lens can produce a focus, but when multiple
When sub- lens combination is in a lens, each lens can correspond to respective wavelength and form focus point, every kind of lens arrangement
Geometric parameter is duplicate, but the different every kind of structure of Space Rotating angle corresponds to a kind of lens.For each on lens
The specific calculating that phase caused by structure forms focus point is as follows:
The position of each focus point is determined first, then uses the aplanatism principle of lensIt is saturating to calculate the corresponding super surface of each focus
The phase distribution of mirror --- the angle that i.e. each cellular construction needs to rotate.
The phase that exactly super surface should meet, wherein x, y are the coordinate points on super surface, and λ is incident light
Wavelength.Wherein, " ± " indicates the rotation direction of incident light.By (1) formula it is found that required rotation angle it is positive and negative dependent on incident light
Rotation direction.Determine the phase of each different locationThe phase distribution on entire multi-focus lens is determined that.Separately
Outside, after super surface structure design determines, by changing the fermi level of multi-layer graphene substrate so as to reflected light
Additive phase is provided dynamically to regulate and control the focal position of this multifocal mirror lens.
After the phase that corresponding different wave length lens have above been determined, three kinds of super surface textures need to be only placed in correspondence by us
Position, and rotate respective angles and can meet multi-focus lens function, here with Pancharatnam-Berry phase
Position.Assuming that the electric field of incident circularly polarized light indicates are as follows:
Wherein, E0(r, θ) is optical field amplitude, and σ=± 1, sign represents left-right rotary circularly polarized light.The output light on super surface
Are as follows:
It was noted that output light field circular polarization chirality occurs to invert and obtains an additional phase:
φPB=2 σ θ (5)
The cylinder or its complementary structure for being directed toward angle space θ variation are the typical case's lists for constructing the super structure surface device of geometric phase type
Meta structure.The structure has anisotropy for different polarization states, therefore, when circular polarization electromagnetic wave incident to body structure surface,
With the electromagnetic wave that is penetrated after structural interaction other than containing main polarized electromagnetic wave, it can also excite with orthogonal polarisation state
Electromagnetic wave.And orthogonal polarisation state electromagnetic wave can generate SPA sudden phase anomalies relevant to structure direction angle, and SPA sudden phase anomalies value is 2 σ θ (σ
=1).And the parameter by rationally designing column structure can make same polarization back wave reach minimum, cross polarization back wave reaches
To maximum.
Three lenslets that the different column structure in three kinds of super surface that the design as shown in Figure 3 is proposed includes are to use square
Shape block indicates.Note: different rectangular configurations is it is merely meant that several different sub-lens here, illustrates the structures of lens accordingly
At the cellular construction for being not offered as surpassing surface herein must be rectangular block.The column structure includes four side column shapes, triangular prism
Shape, hexagonal column shape and cylindric, elliptic cylindrical shape etc..
A branch of left circularly polarized light (LCP) is incident on the super surface of medium, different by the different structural response in super surface
Wavelength, simultaneously because the reflection of multi-layer graphene, incident light can in its three different focal points of ipsilateral formation, as shown in Fig. 2,
Three independent reflection focusing focuses are formd under defined three kinds of wave bands, and can be by adjusting taking for multi-layer graphene
Rice energy level comes dynamic regulation focal position, and focal length is as shown in Figure 4 with the variation relation of multi-layer graphene fermi level.
It, can by numerical simulation Fig. 5 when with the left circularly polarized light incidence of a certain wave band when designed super surface
A focus only can be generated to find out in reflected light, also can when gradually increasing the number that incident wave band number emulates focus accordingly
Increase therewith, this illustrates the feasibility of the adjustable mirror lens of multifocal dynamic of our design from theoretical angle.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is defined by the following claims.
Claims (6)
1. a kind of method based on medium and graphene construction dynamic multifocal super lens, wherein the reflection multifocal is super
Surface lens at least should include the super surface array of multi-layer graphene substrate and multiple and different periodic structures, and feature includes such as
Lower step:
Step (1) is in 0.7um~500um infrared wavelength bandwidth of operation, special regulation of the super surface of basis to light wave first,
At different wavelengths with the super surface texture of periodicity of the rotation oscillator of the cycle design response different wave length incident light of needs；
Step (2) for every kind of central wavelength, according to required focus and nanocell structures regulation phase mechanism from it is different
Different focusing requirement formula and lens aplanatism principle under wavelength, the phase gradient distribution on the super surface of calculation medium；
Step (3) designs basic unit of the column structure for determining height as the super surface of medium, by obtained phase gradient point
The periodic structure on the super surface of cloth binding medium, according to the phase requirements of each basic unit and Pancharatnam-Berry phase
Position, adjusts the Space Rotating angle of each cellular construction to obtain required phase distribution；
Step (4) application multi-layer graphene carries out the reflection of high reflectance and passes through to change graphene as substrate to incident light
Fermi level required additive phase is provided for reflected light, realize to the dynamic regulation of reflective phase, do not changing super table
The case where face structure, which gets off, dynamically changes bifocal focal position.
2. each column structure as described in claim 1, by the parameter of reasonable design cell structure, on super surface
It is equivalent to a half wave plate, it can convert most incident circularly polarized light to its orthogonal polarisation state.It is left-handed
After surpassing surface texture interaction with anisotropy, its reflection orthogonal polarisation state electromagnetic wave includes circular polarization incident electromagnetic wave
The not original spin phase of phase shift and conversion phase bit position (the referred to as Pancharatnam-Berry phase with induction phase shift
Position), this additional phase is ± 2 θ, and wherein θ is the azimuth of super surface cell structure.Multi-layer graphene substrate is also right simultaneously
Reflected light generates additive phase, and realization is further tuned original structure reflected phase.
3. as described in claim 1, using lens aplanatism principle, i.e., for any focus F (x1,y1,z1), super surface phase
It should meet:
For the reflected phase at super surface coordinate point (x, y), λ is incident light operation wavelength.Wherein, " ± " indicates
The rotation direction of incident light.By (1) formula it is found that the positive and negative rotation direction dependent on incident light of required rotation angle.It determines on super surface
The phase of each different locationThe phase distribution on the super surface reflection lens of entire multifocal is determined that.Separately
Outside, after super surface structure design determines, the fermi level by changing multi-layer graphene substrate can be provided reflected light
Additive phase dynamically regulates and controls the focal position of this multifocal mirror lens.
4. a kind of method based on medium and graphene construction dynamic multifocal super lens as described in claim 1, feature
It is the wave-length coverage of selected light wave in infrared wavelength range, according to the optical characteristics of graphene, the stone in this wave band
The surface conductivity of black alkene influenced by chemical potential it is bigger, chemical potential increase when, surface conductivity is significantly increased, this is electromagnetism
The reflection of wave provides biggish reflectivity.
5. a kind of method based on medium and graphene construction dynamic multifocal super lens as described in claim 1, feature
Be the material characteristics of the column structure of the selection are as follows: and loss high in service band dielectric constant be low include silicon nitride,
Phosphatization transfers, titanium dioxide, silicon etc..
6. a kind of method based on medium and graphene construction dynamic multifocal super lens as described in claim 1, feature
It is that column structure described in the step (3) includes four side column shapes, triangle column, hexagonal column shape and cylindric, oval
Column etc..
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109901251A (en) * | 2019-04-14 | 2019-06-18 | 桂林电子科技大学 | A kind of bifocus based on multi-layer graphene and Diode laser super lens |
| CN110133876A (en) * | 2019-06-18 | 2019-08-16 | 南开大学 | A kind of super surface lens of Terahertz graphene and design method of focus adjustable |
| CN110989047A (en) * | 2019-07-29 | 2020-04-10 | 华南理工大学 | Focal length-adjustable graphene metamaterial lens and design method thereof |
| CN111913241A (en) * | 2019-05-07 | 2020-11-10 | 三星电子株式会社 | Superlens and optical device comprising a superlens |
| CN112068228A (en) * | 2020-07-31 | 2020-12-11 | 国家纳米科学中心 | Plane focusing lens device based on phonon polarized waves |
| CN112162421A (en) * | 2019-10-14 | 2021-01-01 | 南开大学 | Reflective broadband adjustable polarization converter based on multilayer graphene-medium composite super surface |
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| CN112859230A (en) * | 2021-01-20 | 2021-05-28 | 成都第三象限未来科技有限公司 | Terahertz super-structure focusing lens for realizing one-way spin circular polarization state conversion |
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| CN109901251A (en) * | 2019-04-14 | 2019-06-18 | 桂林电子科技大学 | A kind of bifocus based on multi-layer graphene and Diode laser super lens |
| CN111913241A (en) * | 2019-05-07 | 2020-11-10 | 三星电子株式会社 | Superlens and optical device comprising a superlens |
| CN110133876A (en) * | 2019-06-18 | 2019-08-16 | 南开大学 | A kind of super surface lens of Terahertz graphene and design method of focus adjustable |
| CN110989047A (en) * | 2019-07-29 | 2020-04-10 | 华南理工大学 | Focal length-adjustable graphene metamaterial lens and design method thereof |
| CN110989047B (en) * | 2019-07-29 | 2021-07-20 | 华南理工大学 | Focal length-adjustable graphene metamaterial lens and design method thereof |
| CN112162421A (en) * | 2019-10-14 | 2021-01-01 | 南开大学 | Reflective broadband adjustable polarization converter based on multilayer graphene-medium composite super surface |
| WO2021077485A1 (en) * | 2019-10-21 | 2021-04-29 | 中国科学院上海光学精密机械研究所 | Metasurface sparse aperture lens |
| CN112068228B (en) * | 2020-07-31 | 2022-04-26 | 国家纳米科学中心 | Plane focusing lens device based on phonon polarized waves |
| CN112068228A (en) * | 2020-07-31 | 2020-12-11 | 国家纳米科学中心 | Plane focusing lens device based on phonon polarized waves |
| CN112379514A (en) * | 2020-10-30 | 2021-02-19 | 江苏宇迪光学股份有限公司 | Polarization-independent superlens and design method thereof |
| CN112505009A (en) * | 2020-11-12 | 2021-03-16 | 中国科学院长春光学精密机械与物理研究所 | Super surface lens and fluorescence signal collection system formed by same |
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| CN112859230B (en) * | 2021-01-20 | 2022-11-25 | 成都第三象限未来科技有限公司 | Terahertz super-structure focusing lens for realizing one-way spin circular polarization state conversion |
| CN113325496A (en) * | 2021-05-13 | 2021-08-31 | 中国科学院上海微系统与信息技术研究所 | Sub-wavelength antenna, wavelength-controllable superlens and superlens design method |
| CN113608282A (en) * | 2021-08-16 | 2021-11-05 | 合肥工业大学 | Six-pixel full-vector polarization information acquisition device based on full-medium super surface and application |
| CN113695748A (en) * | 2021-08-23 | 2021-11-26 | 西安交通大学 | Rapid sharkskin surface structure preparation method based on spatial light modulator |
| CN113695748B (en) * | 2021-08-23 | 2022-10-25 | 西安交通大学 | Rapid preparation method of sharkskin surface structure based on spatial light modulator |
| CN114280707A (en) * | 2022-03-03 | 2022-04-05 | 季华实验室 | Full-polarization medium super-structured lens and use method thereof |
| CN115024695A (en) * | 2022-08-10 | 2022-09-09 | 杭州纳境科技有限公司 | Super lens subassembly, optical system and wearable equipment |
| CN115421227A (en) * | 2022-10-08 | 2022-12-02 | 桂林电子科技大学 | Novel bionic antireflection film structure |
| CN115421227B (en) * | 2022-10-08 | 2023-06-13 | 桂林电子科技大学 | Bionic antireflection film structure |
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