CN107340559A - High efficiency and broad band circular polarization switching device and method based on super clever surface - Google Patents
High efficiency and broad band circular polarization switching device and method based on super clever surface Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
Abstract
High efficiency and broad band circular polarization switching device and method disclosed by the invention based on super clever surface, belong to micronano optical applied technical field.High efficiency and broad band circular polarization switching device disclosed by the invention based on super clever surface is composite construction, including nano-antenna layer, spacer dielectric layer and metallic substrate layer.Nano-antenna layer is to the specific phase of the linearly polarized light of incidence generation and Modulation and Amplitude Modulation；Spacer dielectric layer is accumulating the phase change of light wave；Metallic substrate layer is used to reflect the light wave propagated in metallic substrates layer surface, improves the overall transformation efficiency of device；Nano-antenna layer, spacer dielectric layer and metallic substrate layer integrally form optical resonator, and the light beam that can make to propagate in optical resonator produces Fabry Perot multiple-beam interference effect.Invention additionally discloses the high efficiency and broad band circular polarization conversion method based on super clever surface based on described circular polarization switching device realization.The present invention can realize efficient and broadband the modulation to being emitted circularly polarized light.
Description
Technical field
The present invention relates to a kind of high efficiency and broad band circular polarization switching device and method based on super clever surface, belong to micronano optical
Applied technical field.
Background technology
Polarization state is one of important attribute of electromagnetic wave.The polarization state of electromagnetic wave is controlled, realizes the conversion of different polarization states,
All had a wide range of applications in fields such as optical sensing, imaging, communication, chemical analyses.Control the polarization state of electromagnetic wave, Ke Yitong
Cross incident light being decomposed into after two orthogonal beam components and reach required phase delay.The conventional method of modulating polarization state
Anisotropic material is based primarily upon, the material such as with birefringence, when light is not along principal-axis incident, ordinary light and non-is sought
Different phase change accumulation is produced between ordinary light, phase difference is formed in outgoing, so as to realize the conversion of polarization state.Generally,
Birefringent material in nature has crystal and liquid crystal etc..The shortcomings that this traditional methods mainly include narrow bandwidth, large scale with
And can material category it is few, be unfavorable for the miniaturization of optical device and integrated.
Scientific research personnel has carried out substantial amounts of research work to metamaterial in recent years.Metamaterial is a kind of engineer
The structure of sub-wavelength dimensions, there is the novel physics characteristic being not present in nature material.A variety of light based on metamaterial
Electricity Functional application has been suggested and proved, such as negative refraction, super lenses and " stealthy cape " etc..The super clever material of anisotropy
Material, chiral metamaterial etc. have been supplied in microwave into all kinds of polarization converter devices of visible light wave range.However, three-dimensional super clever material
There is processing technology difficulty and large volume inconvenience in material, it is to utilize super clever surface to solve a this kind of difficult feasible way.It is super
Clever surface is made up of the sub-wavelength size metallic or media units two-dimensional array of sophisticated design, and its thickness is much smaller than wavelength.It is logical
Rational structure design is crossed, the scattered field of each pixel can be changed point by point in its plane, so as to control corresponding phase, amplitude
And polarization state, the final any required modulation realized to wavefront.
Super clever surface can widen bandwidth of operation, have preferable robustness and consume relatively low processing cost, by more next
Apply more in integrated nanometer photonic device.Regulation and control are carried out using super clever surface to the polarization state of electromagnetic wave to have attracted largely
The research interest of scientific research personnel.By the cellular construction on the super clever surface of sophisticated design single or multiple lift, a variety of polarizations can be obtained
The regulation and control scheme of state, such as：Utilize the structure setting of metal antenna-dielectric layer-metal level, it is possible to achieve the effect at 685nm
The linear polarization that rate is 96% changes (Phys.Rev.Applied.80,023807,2009)；Utilize four layers of wire grating of cascade
Thin plate, can at 2 μm of wavelength by the light wave of focusing from linear polarization be converted to circular polarization state (Appl.Phys.Lett.102,
231116,2013)；Using double super clever surfaces of F types metal aperture individual layer, the broadband line polarization conversion effect of terahertz wave band may be implemented in
Fruit, its efficiency of transmission are no more than 40% (Opt.Lett.13,3185-8,2015)；The super clever surface of individual layer based on metal bar structure
Polarization converter, can near infrared band carry out broadband line-circular polarization mutually change, efficiency be no more than 40%
(Sci.Rep.5,18106,2015)；By the way that with reference to grapheme material, the line-circle that may be implemented in terahertz wave band wideband operation is inclined
Conversion and line-linear polarization conversion, its efficiency of transmission of shaking are not higher than 50% (Opt.Lett.23,5592-55952016).It can be seen that
In the super clever surface polarization converter device reported, there is high conversion efficiency and the device of wideband operation simultaneously near infrared band
Part is relatively difficult to achieve, and which has limited its application scenario.
The content of the invention
It is of the invention in order to solve the problems, such as that the polarizer for being currently based on super clever surface is difficult to high efficiency and broad band regulation and control
Purpose is to provide a kind of super clever surface circular polarization switching device based on double mirror image antenna, also provides based on described
Circular polarization switching device the high efficiency and broad band circular polarization conversion method based on super clever surface, realize to be emitted circularly polarized light height
Effect and the modulation in broadband.
High efficiency and broad band circular polarization switching device disclosed by the invention based on super clever surface is composite construction, including nanometer day
Line layer, spacer dielectric layer and metallic substrate layer.Nano-antenna layer is producing specific phase to the linearly polarized light of incidence and shake
Width is modulated, and is formed by being arranged into array with the symmetrical nano-antenna of dual mirror picture, and each nano-antenna unit includes one
Nano-antenna, described nano-antenna unit unit size are much smaller than wavelength.Spacer dielectric layer changes to accumulate the phase of light wave
Become, material selection dielectric.Metallic substrate layer is used to reflect the light wave propagated in metallic substrates layer surface, improves the whole of device
Body conversion efficiency.Spacer dielectric layer between nano-antenna layer and metallic substrate layer, nano-antenna layer and spacer dielectric layer
Thickness meets in the range of sub-wavelength.Nano-antenna layer, spacer dielectric layer and metallic substrate layer integrally form optical resonator, energy
The light beam for enough making to propagate in optical resonator produces Fabry-Perot multiple-beam interference effect.
Described nano-antenna layer design method be：
The polarization state of electromagnetic wave can be characterized with Jones matrix, and modulation of the planar optical device to light is characterized with collision matrix.
Plane where super clever surface is the scattering array of salt free ligands, and its collision matrix is expressed as：
Wherein, θ is incidence angle, and a, b, c, d are complex coefficients.Super clever surface can couple tangential electric field and the magnetic of normal direction
, when the tangential electric field of incident light is identical with the magnetic-field component of normal direction, the excitation to super clever surface is also identical.
Meanwhile under conditions of no complementary field, Lorentz reciprocal theorem is set up.According to matrix analysis, when super clever surface receives
When the light of normal incidence excites, under conditions of lossless, the matrix element in its collision matrix meets relation：A=d, | b |=| c |.
Further, for two-dimentional achirality cellular construction, can be overlapped by the rotation process in face with its mirror-image structure.Therefore,
When light normal incidence is to the super clever surface being made up of achirality antenna structure, the light of forward entrance and reversely incidence will be with a pair of mirrors
As structural interaction, it that is to say and rotate the cellular construction interaction before and after certain angle.By defining in collision matrix
Nondiagonal element, obtain the parameter in nondiagonal element b, c phase termCorresponding to the orientation of the forward-propagating eigenstate of collision matrix
Angle, while also correspond to the deflection of the mirror symmetry of achirality structure under the conditions of normal incidence.Therefore, by two-dimentional achirality list
The super clever surface that member is formed carries out the rotation of certain angle, that is, causes the rotation of the respective angles of its collision matrix eigenstate.Due to
It the structural symmetry of two-dimentional achirality cellular construction, can be overlapped after rotated with original structure, that is to say and correspond to before and after rotating
Collision matrix is equal.By the equal relation of collision matrix before and after rotation, the phase relation between nondiagonal element b, c is solved, is obtained
To the expression formula of the collision matrix on the super clever surface being made up of under the conditions of normal incidence achirality antenna structure：
Wherein κ andBe nondiagonal element b, c phase term in parameter.For the birefringence that has under the conditions of lossless
Super clever surface, by solving the parameters relationship under conservation of energy constraints, obtain one group and specifically solve：
Further write out the expression formula of the collision matrix after constraint：
In order to obtain the eigenstate of circular polarization, selectionWherein n is integer.It is updated in formula (3), i.e.,
The collision matrix of circular polarization eigenstate can be obtained：
Therefore, from the nano-antenna with double mirror symmetry, by suitable unit cycle set, and set
The polarization direction of incident ray polarized light and the mirror axis angle of achirality structure are 45 ° or 135 °, have nano-antenna layer
There is collision matrix shown as shown in Equation (4).It should be noted that incident light, is generally first decomposed into mutually by the regulation and control for polarization
Perpendicular polarized component, by controlling the phase difference between component, reach the polarization conversion effect being finally superimposed.Therefore, it is right
, it is necessary to meet that nano-antenna layer has not for the linearly polarized light in x and y directions when the geometric parameter of nano-antenna layer is set
Same resonant frequency, so as to ensure that device has wider service band scope.
Described spacer dielectric layer design method is：
In order to realize the effect of accumulated phase, using spacer dielectric layer, spacer dielectric layer is transparent medium for electromagnetic wave.
Spacer dielectric layer thickness is adjustable, by control interval thickness of dielectric layers, can obtain polarization conversion in the range of different frequency and
The circular polarization conversion effect of different rotation directions.
The preferred Ω types nano-antenna layer of described nano-antenna layer.Linearly polarized light of the Ω types nano-antenna for x and y directions
With different resonant frequencies, so as to ensure that device has wider service band scope.
Described Ω type gold nano antenna element sizes are in sub-wavelength scope.
The described preferred MgF of blank medium layer material2。
Described metallic substrate material is preferably golden.
Invention additionally discloses the high efficiency and broad band circular polarization switching device based on super clever surface realize based on super clever surface
High efficiency and broad band circular polarization conversion method, the light beam for being incident to the high efficiency and broad band circular polarization switching device surface based on super clever surface are
The laser that will be modulated, incident light polarization direction is modulated to through the polarizer at 45 ° with the antenna mirror axis of device surface
Or the linearly polarized light at 135 ° of angles, incided along circular polarization switching device normal to a surface direction on device surface.Linear polarization enters
Light is penetrated with after the interaction of circular polarization switching device, accumulating enough phase changes, and with close to lossless reflection, is reflected
The polarization state of light is circular polarization, so as to realize efficient and broadband the modulation to being emitted circularly polarized light.
High efficiency and broad band circular polarization switching device and method disclosed by the invention based on super clever surface, service band are communicating
In optical band, there is stronger application.
Beneficial effect：
1st, high efficiency and broad band circular polarization switching device and method disclosed by the invention based on super clever surface, using based on
The super clever surface of the nanotube antenna array of double mirror symmetry, with reference to spacer dielectric layer and metallic substrate layer, there is provided Yi Zhong
Efficient, broadband the method that line-circle conversion is carried out to reflection polarization state of near infrared band work, can be in ± 45 ° of directions
The reflected light of circular polarization state is generated under linear polarization normal incidence, gained reflection circularly polarized light has the effect of ultra wide band,
And the conversion efficiency with superelevation, solve currently super clever surface polarizer and be difficult to asking for high efficiency and broad band polarization regulation and control
Topic.Especially, service band of the present invention has stronger application in telecommunications optical band.
2nd, the high efficiency and broad band circular polarization switching device disclosed by the invention based on super clever surface be it is a kind of it is all solid state, ultra-thin,
Planar wave component, it is not necessary to the operation such as any mechanical stretching, rotation, it is therefore, disclosed by the invention based on super clever surface
High efficiency and broad band circular polarization switching device and method, it is widely portable to minimize, is miniaturized, among integrated photovoltaic applications, it is special
It is not laser communication system, among Polarization Detection system, effectively mitigates its volume and weight, and can be on the piece of integrated optics
Using a kind of efficient and broadband modulator approach of offer.
Brief description of the drawings
Fig. 1 is the structural representation of the high efficiency and broad band circular polarization switching device based on super clever surface；(a) three-decker is illustrated
Figure, (b) Ω type antenna unit structure schematic diagrames；Wherein：1-nanotube antenna array, 2-spacer dielectric layer, 3-metallic substrates
Layer；
Fig. 2 is two-dimentional achirality cellular construction and its mirror-image structure schematic diagram；
Fig. 3 is linearly polarized light normal incidence that the angle of polarization is 45 ° to the high efficiency and broad band circular polarization converter based on super clever surface
The reflectance map of part.(a) phase of the amplitude of reflected light x-component and y-component, (b) reflected light x-component and y-component；
Fig. 4 is reflected light stokes parameter.(a) angle of polarization is the linearly polarized light vertical incidence of 45 ° and -45 ° to device
The stokes parameter of the reflected light on surface, the linearly polarized light oblique incidence that (b) angle of polarization is 45 ° to the height based on super clever surface
The stokes parameter for the reflected light that effect wideband circular polarization switching device surface obtains, wherein incidence angle be respectively 15 °, 30 ° and
45°；
Fig. 5 is the stokes parameter absolute value of reflected light when incident light polarization angle changes in the range of 0 °~360 °.
Embodiment
Present invention is described with reference to the accompanying drawings and examples.Specific implementation described herein is only explaining this
Invention, is not intended to limit the present invention.
Embodiment 1：
For verify the high efficiency and broad band circular polarization switching device and method feasibility disclosed by the invention based on super clever surface and
Beneficial effect, below so that operation wavelength is the super clever surface of λ=1.2 μm~1.6 μm as an example.
As shown in figure 1, the circular polarization switching device of the high efficiency and broad band based on super clever surface disclosed in the present embodiment is compound
Structure, including Ω type nano-antennas layer 1, spacer dielectric layer 2 and metallic substrate layer 3 are formed.Ω type nano-antenna layers 1 are to entering
The linearly polarized light penetrated produces specific phase and Modulation and Amplitude Modulation, by being arranged into battle array with the symmetrical Ω types nano-antenna of dual mirror picture
Row are formed, and each Ω types nano-antenna unit includes a Ω type nano-antenna, described Ω type nano-antenna unit units
Size is much smaller than wavelength.Spacer dielectric layer 2 is accumulating the phase change of light wave, material selection dielectric.Metallic substrate layer 3 is used
In the light wave that propagates in metallic substrates layer surface of reflection, the overall transformation efficiency of device is improved.Spacer dielectric layer 2 is located at nanometer
Between antenna stack and metallic substrate layer 3, the thickness of Ω type nano-antennas layer 1 and spacer dielectric layer 2 meets in the range of sub-wavelength.
Ω type nano-antennas layer 1, spacer dielectric layer 2 and the overall composition optical resonator of metallic substrate layer 3, can make in optical resonator
The light beam of propagation produces Fabry-Perot multiple-beam interference effect.
Ω types nano-antenna has different resonant frequencies for the linearly polarized light in x and y directions, so as to ensure device
With wider service band scope.
Described Ω type gold nano antenna element sizes are in sub-wavelength scope.
Described blank medium layer material selects MgF2。
Described metallic substrate material choosing gold.
Described nano-antenna layer design method be：
A Ω type metal structure is included in the individual unit cycle on the super clever surface based on Ω type nanotube antenna arrays, it is whole
Individual array is arranged into plane layer by multiple unit periodic structures, as shown in Figure 1.Ω type nano-antennas are that two-dimentional achirality is double
Mirror image, as shown in Fig. 2 collision matrix meets formula (3).The parameters of structural dimension of sophisticated design Ω type nano-antennas
As shown in figure 1, the outer radius of the ring part of Ω type structures is 100nm, the length of two sides and opening is 80nm, and width is
50nm, cycle 320nm, such parameters of structural dimension can modulate the incident light of near infrared band.When the linear polarization of incident light
When angle is π/4 or-π/4, optimal circular polarization conversion effect is obtained, that is, meets the collision matrix of formula (4).Pass through Ω type nanometers
The setting of antenna stack 1, the transmitted light and reflected light of circular polarization are obtained, and the two is oppositely oriented, and amplitude is equal, but efficiency is resonable
By it is upper respectively be 50%, still need to further be designed and improve the conversion efficiency of reflected light.
Described spacer dielectric layer design method is：
Spacer dielectric layer 2 is mainly poor to change the accumulated phase of incident light, can be not by designing its thickness
With the circular polarization reflected light obtained in frequency range.Under different thickness conditions, the circularly polarized light of different rotation directions is obtained.Here selection is thick
Spend and illustrated for 50nm.
Incident light interacts with Ω type nano-antennas layer 1, the eigenstate transmission and reflection of circular polarization is obtained, wherein transmiting
A part by spacer dielectric layer 2 and the unlimited secondary reflection of metallic substrate layer 3 and transmission, be emitted from Ω type nano-antennas layer 1,
Optical superposition is reflected with front portion, ultimately forms circular polarization state reflected light.When electromagnetic wave is decomposed into x and y durection components, its is anti-
The electric field component penetrated is equal in 185THz~250THz frequency ranges (1.2 μm~1.6 μm of corresponding wavelength) interior amplitude, and phase difference is about
90 °, as circular polarization state, as shown in Figure 3.The polarization state of reflected light, Stokes are further characterized using stokes parameter
The calculation formula of parameter is as follows：
As shown in Figure 4.As the S of stokes parameter0During close to 1, represent that total light intensity percentage close to 100%, has
There is high conversion efficiency.The S of stokes parameter3During equal to 1 or -1, it is left or right rotation circular polarization state to represent it.Can by Fig. 4
Know, when the angle of polarization of incident ray polarized light is 45 ° and -45 °, by the modulation of the device, in 187THz~250THz width
Oppositely oriented circular polarization reflected light can be obtained in frequency band range (1.2 μm~1.6 μm of corresponding wavelength), and conversion efficiency is higher than
92%.High efficiency and broad band circular polarization switching device based on super clever surface has certain flexibility and adjustability, when incident light inclines
During oblique incidence, elliptically polarized light or approximate rotatory polarization can be obtained, the slant range of incidence angle can reach ± 45 °, such as Fig. 4 institutes
Show.The relation of the angle of polarization is as shown in Figure 5 when the polarization state and normal incidence of reflected light.Figure middle latitude represents the exhausted of stokes parameter
To value, longitude represents the size of the angle of polarization.In the case of normal incidence, when incident light polarization angle is not equal to 45 °, based on super clever table
The high efficiency and broad band circular polarization switching device in face can carry out elliptical polarization conversion to it.
High efficiency and broad band circular polarization switching device based on super clever surface disclosed in the present embodiment be it is a kind of it is all solid state, ultra-thin,
Planar wave component, it is not necessary to which the operation such as any mechanical stretching, rotation, therefore, the present embodiment is disclosed to be based on super clever surface
High efficiency and broad band circular polarization switching device and method, be widely portable to minimize, be miniaturized, among integrated photovoltaic applications,
Particularly laser communication system, among Polarization Detection system, effectively mitigate its volume and weight, and can be the piece of integrated optics
Upper application provides a kind of efficient and broadband modulator approach.
Above-described specific descriptions, the purpose, technical scheme and beneficial effect of invention are carried out further specifically
It is bright, it should be understood that the specific embodiment that the foregoing is only the present invention, the protection model being not intended to limit the present invention
Enclose, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., should be included in the present invention
Protection domain within.
Claims (6)
1. the high efficiency and broad band circular polarization switching device based on super clever surface, it is characterised in that：For composite construction, including nano-antenna
Layer (1), spacer dielectric layer (2) and metallic substrate layer (3)；Nano-antenna layer (1) is specific to be produced to the linearly polarized light of incidence
Phase and Modulation and Amplitude Modulation, formed by being arranged into array with the symmetrical nano-antenna of dual mirror picture, each nano-antenna list
Member includes a nano-antenna, and described nano-antenna unit unit size is much smaller than wavelength；Spacer dielectric layer (2) is accumulating
The phase change of light wave, material selection dielectric；Metallic substrate layer (3) propagates to metallic substrate layer (3) surface for reflection
Light wave, improve the overall transformation efficiency of device；Spacer dielectric layer (2) be located at nano-antenna layer (1) and metallic substrate layer (3) it
Between, the thickness of nano-antenna layer (1) and spacer dielectric layer (2) meets in the range of sub-wavelength；Nano-antenna layer (1), interval are situated between
The overall composition optical resonator of matter layer (2) and metallic substrate layer (3), the light beam for making to propagate in optical resonator produce Fabry-
Perot multiple-beam interference effect.
2. the high efficiency and broad band circular polarization switching device based on super clever surface as claimed in claim 1, it is characterised in that：Described
Nano-antenna layer (1) design method is：
The polarization state of electromagnetic wave can be characterized with Jones matrix, and modulation of the planar optical device to light is characterized with collision matrix；It is super clever
Plane where surface is the scattering array of salt free ligands, and its collision matrix is expressed as：
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Wherein, θ is incidence angle, and a, b, c, d are complex coefficients；Super clever surface can couple the magnetic field of tangential electric field and normal direction, when
When the tangential electric field of incident light is identical with the magnetic-field component of normal direction, the excitation to super clever surface is also identical；Meanwhile
Under conditions of no complementary field, Lorentz reciprocal theorem is set up；According to matrix analysis, when super clever surface receives normal incidence
Light when exciting, under conditions of lossless, the matrix element in its collision matrix meets relation：A=d, | b |=| c |；Further
, for two-dimentional achirality cellular construction, can be overlapped by the rotation process in face with its mirror-image structure；Therefore, when light just
When inciding the super clever surface being made up of achirality antenna structure, the light of forward entrance and reversely incidence will be with a pair of mirror-image structures
Interaction, it that is to say and rotate the cellular construction interaction before and after certain angle；By defining the non-diagonal in collision matrix
Member, obtain the parameter in nondiagonal element b, c phase termCorresponding to the azimuth of the forward-propagating eigenstate of collision matrix, simultaneously
Also correspond to the deflection of the mirror symmetry of achirality structure under the conditions of normal incidence；Therefore, two-dimentional achirality unit is formed
Super clever surface carry out the rotation of certain angle, that is, cause the rotation of the respective angles of its collision matrix eigenstate；Because two dimension is non-
It the structural symmetry of chiral unit structure, can overlap, that is to say corresponding to the front and rear scattering square of rotation with original structure after rotated
Battle array is equal；By the equal relation of collision matrix before and after rotation, the phase relation between nondiagonal element b, c is solved, is obtained just
The expression formula of the collision matrix on the super clever surface being made up of under the conditions of incidence achirality antenna structure：
Wherein κ andBe nondiagonal element b, c phase term in parameter；For the super clever table with birefringence under the conditions of lossless
Face, by solving the parameters relationship under conservation of energy constraints, obtain one group and specifically solve：
Further write out the expression formula of the collision matrix after constraint：
In order to obtain the eigenstate of circular polarization, selectionWherein n is integer；It is updated in formula (3), you can obtain
Obtain the collision matrix of circular polarization eigenstate：
Therefore, from the nano-antenna with double mirror symmetry, by suitable unit cycle set, and set incident
The polarization direction of linearly polarized light and the mirror axis angle of achirality structure are 45 ° or 135 °, have nano-antenna layer (1)
Collision matrix as shown in formula (4)；It should be noted that incident light, is generally first decomposed into mutually by the regulation and control for polarization
Vertical polarized component, by controlling the phase difference between component, reach the polarization conversion effect being finally superimposed；Therefore, to receiving
, it is necessary to meet that nano-antenna layer (1) has for the linearly polarized light in x and y directions when the geometric parameter of rice antenna stack (1) is set
There is different resonant frequencies, so as to ensure that device has wider service band scope.
3. the high efficiency and broad band circular polarization switching device based on super clever surface as claimed in claim 2, it is characterised in that：Described
Spacer dielectric layer (2) design method is：
In order to realize the effect of accumulated phase, using spacer dielectric layer (2), spacer dielectric layer (2) is transparent Jie for electromagnetic wave
Matter；Spacer dielectric layer (2) thickness is adjustable, by control interval dielectric layer (2) thickness, can obtain inclined in the range of different frequency
The circular polarization conversion effect for conversion and the different rotation directions of shaking.
4. the high efficiency and broad band circular polarization switching device based on super clever surface as claimed in claim 3, it is characterised in that：Described
Nano-antenna layer (1) preferably Ω type nano-antenna layers (1)；Ω types nano-antenna has difference for the linearly polarized light in x and y directions
Resonant frequency, so as to ensure that device has wider service band scope.
5. the high efficiency and broad band circular polarization switching device based on super clever surface as claimed in claim 4, it is characterised in that：
Described Ω type gold nano antenna element sizes are in sub-wavelength scope；
Described spacer dielectric layer (2) material selects MgF2；
Described metallic substrate layer (3) material choosing gold.
6. the high efficiency and broad band circular polarization conversion method based on super clever surface, it is characterised in that：Based on such as claim 1,2,3,4,5
The described high efficiency and broad band circular polarization switching device based on super clever surface is realized, is incident to the high efficiency and broad band circle based on super clever surface
The light beam on polarization converter device surface is the laser that will be modulated, and is modulated in incident light polarization direction and device table through the polarizer
The antenna mirror axis in face is at 45 ° or the linearly polarized light at 135 ° of angles, enters along circular polarization switching device normal to a surface direction
It is mapped on device surface；Linear polarization incident light is with after the interaction of circular polarization switching device, accumulating enough phase changes, and have
Have close to lossless reflection, the polarization state of reflected light is circular polarization, so as to realize the efficient and broadband to being emitted circularly polarized light
Modulation.
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| CN108363129A (en) * | 2018-04-20 | 2018-08-03 | 南开大学 | More structure combinatorial artificial resistance electromagnetic surfaces |
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