CN106094093A - A kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate - Google Patents
A kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate Download PDFInfo
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- CN106094093A CN106094093A CN201610684633.8A CN201610684633A CN106094093A CN 106094093 A CN106094093 A CN 106094093A CN 201610684633 A CN201610684633 A CN 201610684633A CN 106094093 A CN106094093 A CN 106094093A
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G02B5/3083—Birefringent or phase retarding elements
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Abstract
The invention discloses a kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate, be made up of some periodic wave plate unit, wave plate unit includes SiO2Substrate and the orthogonal cross Silver nanorod structure being positioned on described substrate, substrate is square substrates, its length of side P is 800 ~ 1000nm, the height H of orthogonal cross Silver nanorod structure is 100 ~ 150nm, first width W of described orthogonal cross Silver nanorod structure is 200 ~ 300nm, second length Lx of orthogonal cross Silver nanorod structure is 550 ~ 650nm, and the second width Ly of orthogonal cross Silver nanorod structure is 150 ~ 170nm.The present invention has widened bandwidth of operation significantly, and tolerance for Parameters variation is higher, owing to present micro-nano structure makes the restriction of precision, this is rational in infrastructure, be prone to make, in optical sensor system, advanced nano-photon device and integrated optics system, there is the biggest using value.
Description
Technical field
The present invention relates to a kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate, relate to optical element field.
Background technology
In prior art, polarization state is a kind of very important optical characteristics of light wave.Birefringent crystal material has along flat
The orthogonal direction of row and vertical optical axis has the characteristic of different light refractive indexes, is applied to Traditional control polarization state by wide in range
Device in.During light transmission birefringece crystal, transmission light can produce phase difference in that orthogonal direction, it is achieved the conversion of polarization state.
At present, the photoelectric component of the miniaturization demand high integration of novel industry, and conventional crystal wave plate is by physical size
Restriction, promoted the drastically development of sub-wavelength structure optics, wherein sub-wavelength based on surface plasma body resonant vibration gold
The super surface wave plate belonging to structure has obtained paying attention to widely and studying.
Optics surpasses surface i.e. sub-wavelength and surpasses surface, refers to a kind of thickness artificial stratified material less than wavelength, can realize electricity
The flexible Effective Regulation of the characteristics such as magnetic wave phase place, polarization mode, communication mode.Compared with traditional wave plate, based on super surface
Wave plate can strengthen the characteristic of electromagnetic field regulation and control light wave on ultra-thin platform.Wave plate based on super surface typically utilizes each to different
Property resonating member array, such as nano-seam, inverted-L antenna, H type antenna, V antenna etc.. and wave plate based on these structures is normal
It is subjected to the restriction of arrowband.
In view of this, it is provided that a kind of new two-dimensional metallic wave plate, solve in prior art because of narrow bandwidth, cause range of application
Too small problem, it is clear that be a need for.
Summary of the invention
The goal of the invention of the present invention is to provide a kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate, solves prior art
The problem of middle narrow bandwidth.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of sub-wavelength ultra broadband transmission-type two dimension
Metal wave plate, is made up of some periodic wave plate unit, and described wave plate unit includes SiO2 substrate and is positioned on described substrate
Orthogonal cross Silver nanorod structure,
Described substrate is square substrates, and its length of side P is 700 ~ 900nm,
The height H of described orthogonal cross Silver nanorod structure is 50 ~ 150nm,
First length of described orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W of described orthogonal cross Silver nanorod structure is 100 ~ 200nm,
Second length Lx of described orthogonal cross Silver nanorod structure is 600 ~ 750nm,
Second width Ly of described orthogonal cross Silver nanorod structure is 100 ~ 200nm.
Preferably, described substrate is square substrates, its length of side P=950nm, described orthogonal cross Silver nanorod structure
Highly H=125nm,
First length of described orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=300nm of described orthogonal cross Silver nanorod structure,
Second length Lx=600nm of described orthogonal cross Silver nanorod structure,
Second width Ly=160nm of described orthogonal cross Silver nanorod structure.
Preferably, described substrate is square substrates, its length of side P=950nm, described orthogonal cross Silver nanorod structure
Highly H=125nm,
First length of described orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=300nm of described orthogonal cross Silver nanorod structure,
Second length Lx=600nm of described orthogonal cross Silver nanorod structure,
Second width Ly=160nm of described orthogonal cross Silver nanorod structure.
Preferably, described substrate is square substrates, its length of side P=880nm, the height H of orthogonal cross Silver nanorod structure
=100nm,
First length of orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=300nm of orthogonal cross Silver nanorod structure,
Second length Lx=560nm of orthogonal cross Silver nanorod structure,
Second width Ly=160nm of orthogonal cross Silver nanorod structure.
Preferably, described substrate shape is square, its length of side P=850nm, the height H of orthogonal cross Silver nanorod structure
=140nm,
First length of orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=210nm of orthogonal cross Silver nanorod structure,
Second length Lx=630nm of orthogonal cross Silver nanorod structure,
Second width Ly=165nm of orthogonal cross Silver nanorod structure.
Preferably, when line polarized light incidence, its polarization angle changes with the change of wavelength so that and amplitude component Ex=
Ey, and the phase mehtod of described metal wave plate keeps constant.
The design principle of the present invention is as follows: a branch of line polarized light passes through along the direction at 45 ° with quarter-wave plate fast axis
After quarter-wave plate, transmitted field is the odd-multiple of pi/2 along pairwise orthogonal direction phase difference, and amplitude Ex, Ey are equal, i.e. four points
One of wave plate there is function line polarisation being converted into circularly polarized light.
In the design process of wave plate, by the method for control variable, analyze every structural parameters respectively for super table
The impact of face transmitted field distribution.Metal bar as anisotropic optical resonator, its height H and the width W of vertical silver nanoparticle bar
Regulation and control to phase difference play a major role, and the thickness of metal also contributes to the efficiency of transmission of wave plate, and horizontal nano rod
Vertical width Ly is to the generation position sensing of resonance at shortwave.Thus, determining metal thickness, select suitable structural cycle it
After, regulate and control orthogonal direction phase mehtod by fine setting Lx and W, it is thus achieved that quarter-wave piece performance.
Owing to technique scheme is used, the present invention compared with prior art has the advantage that
The present invention devises a kind of novel sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate, it is achieved that near ~ mid-infrared ultra-wide
Transmission-type quarter-wave plate function in wavelength band, compared with existing wave plate, transmitted electric fields pairwise orthogonal component is extremely
In the over an ultra of few 2500nm, phase difference change is less than the 2% of pi/2 rather than only in the friendship of two neighbouring formants
At fork, significantly widen bandwidth of operation, and the present invention is higher for the tolerance of Parameters variation, due to present micro-nano structure system
Making the restriction of precision, this is rational in infrastructure, be prone to make, at optical sensor system, advanced nano-photon device and Integrated Light
In system, there is the biggest using value.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of the wave plate unit of the present invention.
Fig. 3 is the top view of Fig. 2 wave plate unit.
Fig. 4 is the wave plate unit transmission light orthogonal direction amplitude of Different structural parameters in embodiment one and position accompanies, and wavelength becomes
Change profiles versus's figure.
Fig. 5 is that the phase place of the transmission light of embodiment one Central Asia wavelength transmission formula two-dimensional metallic wave plate and phase difference are with incidence wave
Long change profile figure.
Fig. 6 is that in embodiment one, incident light polarization angle is distributed along transmitance when x and the incidence of y-axis direction with wavelength change
Figure.
Fig. 7 be under different incident polarization angles two-dimensional metallic wave plate absorbance with wavelength change curve chart.
When Fig. 8 is under different incident ray polarized light polarization angle, the amplitude of the transmission light of two-dimensional metallic wave plate and phase place are with entering
Ejected wave long change profile figure.
Fig. 9 is that the phase place of the transmission light of embodiment two Central Asia wavelength transmission formula two-dimensional metallic wave plate and phase difference are with incidence wave
Long change profile figure.
Figure 10 is that in embodiment two, incident light polarization angle is divided along transmitance when x and the incidence of y-axis direction with wavelength change
Butut.
Figure 11 is that the phase place of the transmission light of embodiment three Central Asia wavelength transmission formula two-dimensional metallic wave plate and phase difference are with incidence
Wavelength change scattergram.
Figure 12 is that in embodiment three, incident light polarization angle is divided along transmitance when x and the incidence of y-axis direction with wavelength change
Butut.
Wherein: 1, substrate；2, orthogonal cross Silver nanorod structure.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the invention will be further described:
Embodiment one: shown in Figure 1, a kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate, by some periodic ripples
Blade unit is constituted, and the structural representation of wave plate unit is shown in Figure 2, and described wave plate unit includes SiO2 substrate 1 and is positioned at institute
State the orthogonal cross Silver nanorod structure 2 on substrate,
Shown in Figure 3, for the top view of wave plate unit, substrate shape is square, its length of side P=950nm, orthogonal cross silver
The height H=125nm of nanorod structure,
First length of orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=300nm of orthogonal cross Silver nanorod structure,
Second length Lx=600nm of orthogonal cross Silver nanorod structure,
Second width Ly=160nm of orthogonal cross Silver nanorod structure.
Preferably, incident light polarization angle, θ scope is 30 ° ~ 70 °.
Above-mentioned orthogonal cross Silver nanorod structure includes rectangular configuration and the rectangle being oppositely arranged on rectangular configuration both sides is dashed forward
Going out portion, rectangular stub is stretched out by the both sides of rectangular configuration and forms, above the length of the first a length of rectangular configuration, the
One width is the width of rectangular configuration, between the outermost of the rectangular stub that the second a length of rectangular configuration both sides are relative away from
From, the second width is the width of rectangular stub.Between the rectangular stub that in the present embodiment metal wave plate, the same side is adjacent
Distance is equal with the cycle of wave plate unit.
The present embodiment utilizes Fdtd Method FDTD numerical computation method to be modeled emulation.FDTD method is by Max
Time domain field vorticity equation differential expression in Wei equation group carries out differencing, obtains the finite difference equations of field component, utilizes identical
The space lattice of parameter goes to simulate electromagnetic scattering.
Shown in Figure 4, become for the wave plate unit transmission light orthogonal direction amplitude of Different structural parameters and the position wavelength that accompanies
Change profiles versus's figure.Such as Fig. 4 (a), due to being shaped like of orthogonal nanometer rods, Parameters variation is little, general the two formant
Position located adjacent one another, transmittance graph is expressed as two close narrow and high transmission peaks, can only between Liang Feng very
One section of little wave band realizes arrowband wave plate function, from Fig. 4 (b) it can be seen that along with the length of vertical direction is progressively longer, permissible
Finding out that quadrature exciting formant is opened, occur in that one section of mild phase mehtod between two peaks, bandwidth increases.From Fig. 4 (c)
It can be seen that the formant of the vertical bars of the present embodiment moves to far infrared band and peak height reduces, i.e. its resonance effect
Should die down, eliminate unwanted vertical bars and disperse mutually near infrared position.Shorten the length of horizon bar simultaneously, near-in
Infrared introducing position disperse mutually and with the phase difference of one continuous print pi/2 of vertical direction, by regulating the thickness of metal, Ke Yirang
The phase curve of orthogonal direction is close to parallel between the formant of two wide aparts, and this effect directly results in the reddest
The generation of a mild phase difference, i.e. ultra broadband in the range of the ultra wide wave band of outer wave band.Wherein the divergence problem of amplitude ratio can
To pass through the polarization angle with wavelength shift incident illumination, thus the resonance point changing Ex=Ey solves.
Shown in Figure 5, for the phase place of transmission light and the position phase of the present embodiment Central Asia wavelength transmission formula two-dimensional metallic wave plate
Difference is with incident wavelength change profile figure, shown in Figure 6, enters along x and y-axis direction for incident light polarization angle in the present embodiment
When penetrating, transmitance is with wavelength change scattergram, can be seen that phase difference surpassing between 2000nm to 4500nm from Fig. 5, Fig. 6
In wide wave-length coverage, the phase difference change of transmitted electric fields pairwise orthogonal component, less than the 2% of pi/2, meets quarter-wave plate necessity
Phase difference condition.
Shown in Figure 7, under different incident polarization angles, two-dimensional structure absorbance is with wavelength change curve chart.Because shaking
Amplitude ratio dissipates along with wavelength, it is achieved circularly polarized light is when the conversion of line polarized light, and the electric field polarization angle of transmitted wave dissipates.Real
Existing line polarisation is when the conversion of rotatory polarization, due to dissipating of transmitted field orthogonal direction electric field component amplitude ratio, needs to change with wavelength
The polarization angle becoming incident illumination obtains broadband effect.I.e. incident light polarization Angulation changes, the point of Ex=Ey is moved, and ties
The phase mehtod of structure keeps constant, and simulation show that the incident polarization angle needing to rotate is 70 ° to the maximum.
Shown in Figure 8, for time under different incident ray polarized light polarization angles, the amplitude of the transmission light of two-dimensional metallic wave plate
And phase place is with incident wavelength change profile figure.Wherein in Fig. 8 (a), incident light polarization angle and θ=50 °, x angular separation, this structure
At 2113nm, transmitted field orthogonal direction electric field component Ex=Ey, phase difference 1.59rad, is approximately pi/2, can regard 1/4th as
Wave plate, transmitance is 54%；In Fig. 8 (b), incident light polarization angle and θ=55 °, x angular separation, the transmission at 2970nm of this structure
Field orthogonal direction electric field component Ex=Ey, phase difference is pi/2, can regard quarter-wave plate as, and transmitance is 46%；In Fig. 8 (c),
Incident light polarization angle and θ=64 °, x angular separation, this structure is transmitted field orthogonal direction electric field component Ex=Ey at 3964nm,
Phase difference 1.54rad, is approximately pi/2, can regard quarter-wave plate as, and transmitance is 32%；In Fig. 8 (d), incident light polarization angle
Degree and θ=66 °, x angular separation, this structure is transmitted field orthogonal direction electric field component Ex=Ey, phase difference at 4164nm
1.54rad, is approximately pi/2, can regard quarter-wave plate as, and transmitance is 21%.
In sum, the ultra broadband transmission-type in the present embodiment achieves near-to-mid infrared 2000nm ~ 4500nm wavelength band
Quarter-wave plate function, its bandwidth width is at least 2500nm, in this wavelength band, the position of transmitted electric fields pairwise orthogonal component
Difference change is less than the 2% of pi/2, and incident light polarization angle changes with the change of wavelength, has effectively widened transmission-type wave plate
Bandwidth, and this structure is higher for the tolerance of Parameters variation, owing to present micro-nano structure makes the restriction of precision, this structure
Rationally, it is prone to make, in optical sensor system, advanced nano-photon device and integrated optics system, has the biggest
Using value.
Embodiment two: a kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate, is made up of some periodic wave plate unit, ripple
Blade unit includes SiO2 substrate and the orthogonal cross Silver nanorod structure being positioned on described substrate,
Substrate shape is square, its length of side P=880nm, the height H=100nm of orthogonal cross Silver nanorod structure,
First length of orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=300nm of orthogonal cross Silver nanorod structure,
Second length Lx=560nm of orthogonal cross Silver nanorod structure,
Second width Ly=160nm of orthogonal cross Silver nanorod structure.Incident light polarization angle and θ=45 °, x angular separation.
Shown in Figure 9, for the phase place of transmission light and the position phase of embodiment two Central Asia wavelength transmission formula two-dimensional metallic wave plate
Difference is with incident wavelength change profile figure, and shown in Figure 10, incident light polarization angle is along transmitance when x and the incidence of y-axis direction
With wavelength change scattergram, it can be seen that in phase difference over an ultra between 2200nm to 4800nm, transmitted electric fields
The phase difference change of pairwise orthogonal component, less than the 2% of pi/2, meets the phase difference condition that quarter-wave plate is necessary, it is achieved that ultra-wide
Band.
Embodiment three: a kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate, is made up of some periodic wave plate unit, ripple
Blade unit includes SiO2 substrate and the orthogonal cross Silver nanorod structure being positioned on described substrate,
Substrate shape is square, its length of side P=850nm, the height H=140nm of orthogonal cross Silver nanorod structure,
First length of orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=210nm of orthogonal cross Silver nanorod structure,
Second length Lx=630nm of orthogonal cross Silver nanorod structure,
Second width Ly=165nm of orthogonal cross Silver nanorod structure.Incident light polarization angle and θ=45 °, x angular separation.
Shown in Figure 11, for the phase place of transmission light and the position phase of embodiment three Central Asia wavelength transmission formula two-dimensional metallic wave plate
Difference is with incident wavelength change profile figure, and shown in Figure 12, incident light polarization angle is along transmitance when x and the incidence of y-axis direction
With wavelength change scattergram, it can be seen that in phase difference over an ultra between 2500nm to 5000nm, transmitted electric fields
The phase difference change of pairwise orthogonal component, less than the 2% of pi/2, meets the phase difference condition that quarter-wave plate is necessary, it is achieved that ultra-wide
Band.
Claims (5)
1. a sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate, is made up of some periodic wave plate unit, and its feature exists
In: described wave plate unit includes SiO2Substrate and the orthogonal cross Silver nanorod structure being positioned on described substrate,
Described substrate is square substrates, and its length of side P is 800 ~ 1000nm,
The height H of described orthogonal cross Silver nanorod structure is 100 ~ 150nm,
First length of described orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W of described orthogonal cross Silver nanorod structure is 200 ~ 300nm,
Second length Lx of described orthogonal cross Silver nanorod structure is 550 ~ 650nm,
Second width Ly of described orthogonal cross Silver nanorod structure is 150 ~ 170nm.
Sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate the most according to claim 1, it is characterised in that: described substrate is
Square substrates, its length of side P=950nm, the height H=125nm of described orthogonal cross Silver nanorod structure,
First length of described orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=300nm of described orthogonal cross Silver nanorod structure,
Second length Lx=600nm of described orthogonal cross Silver nanorod structure,
Second width Ly=160nm of described orthogonal cross Silver nanorod structure.
Sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate the most according to claim 1, it is characterised in that: described substrate is
Square substrates, its length of side P=880nm, the height H=100nm of described orthogonal cross Silver nanorod structure,
First length of orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=300nm of orthogonal cross Silver nanorod structure,
Second length Lx=560nm of orthogonal cross Silver nanorod structure,
Second width Ly=160nm of orthogonal cross Silver nanorod structure.
Sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate the most according to claim 1, it is characterised in that: described substrate shape
Shape is square, its length of side P=850nm, the height H=140nm of described orthogonal cross Silver nanorod structure,
First length of orthogonal cross Silver nanorod structure is equal with the side length of substrate,
First width W=210nm of orthogonal cross Silver nanorod structure,
Second length Lx=630nm of orthogonal cross Silver nanorod structure,
Second width Ly=165nm of orthogonal cross Silver nanorod structure.
Sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate the most according to claim 1, it is characterised in that: work as line polarized light
Time incident, its polarization angle changes with the change of wavelength so that amplitude component Ex=Ey, and the position of described metal wave plate is divided mutually
Cloth keeps constant.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110221362A (en) * | 2019-06-11 | 2019-09-10 | 南开大学 | Polarization optical element and image display unit |
| CN113218531A (en) * | 2021-03-05 | 2021-08-06 | 广东工业大学 | Optical fiber temperature sensor and preparation method thereof |
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| CN204758858U (en) * | 2015-05-29 | 2015-11-11 | 苏州大学 | Reflective one -dimensional metal wave plate of inferior wavelength |
| CN105242341A (en) * | 2015-11-05 | 2016-01-13 | 苏州大学 | Super surface quarter wave plate based on surface plasmon polariton |
| CN206057624U (en) * | 2016-08-18 | 2017-03-29 | 苏州大学 | A kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate |
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| JP2008257133A (en) * | 2007-04-09 | 2008-10-23 | Ricoh Co Ltd | Depolarizer, optical device and image display device |
| CN204758858U (en) * | 2015-05-29 | 2015-11-11 | 苏州大学 | Reflective one -dimensional metal wave plate of inferior wavelength |
| CN105242341A (en) * | 2015-11-05 | 2016-01-13 | 苏州大学 | Super surface quarter wave plate based on surface plasmon polariton |
| CN206057624U (en) * | 2016-08-18 | 2017-03-29 | 苏州大学 | A kind of sub-wavelength ultra broadband transmission-type two-dimensional metallic wave plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110221362A (en) * | 2019-06-11 | 2019-09-10 | 南开大学 | Polarization optical element and image display unit |
| CN113218531A (en) * | 2021-03-05 | 2021-08-06 | 广东工业大学 | Optical fiber temperature sensor and preparation method thereof |
| CN113218531B (en) * | 2021-03-05 | 2023-09-29 | 广东工业大学 | Optical fiber temperature sensor and preparation method thereof |
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