CN106099387A - Three frequencies tunable Graphene polarization converters of work - Google Patents
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- CN106099387A CN106099387A CN201610416043.7A CN201610416043A CN106099387A CN 106099387 A CN106099387 A CN 106099387A CN 201610416043 A CN201610416043 A CN 201610416043A CN 106099387 A CN106099387 A CN 106099387A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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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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Abstract
The invention discloses a kind of three frequencies tunable Graphene polarization converter of work, this transducer includes that this polarization converter is made up of multiple polarization three-dimensional elements, multiple polarization three-dimensional elements are horizontal positioned, and the upper and lower surface of multiple polarization three-dimensional element is all on same horizontal plane；Each polarization three-dimensional element includes being positioned at the layer gold of the bottom, being positioned at the silicon dioxide sealing coat in intermediate layer and be positioned at the graphene layer of layer topmost, layer gold, silicon dioxide sealing coat and graphene layer three fix the most successively, and offer multiple punching on graphene layer.The improvement of this structure of the present invention so that this polarization converter have in working frequency range three can operating frequency, the optical rotation rate at each operating frequency is more than 75%, and two of which operating frequency is close to 100%, and polarization working band tunable.
Description
Technical field
The present invention relates to photoelectron technical field, particularly relate to a kind of three frequencies tunable Graphene optical rotation of work
Parallel operation.
Background technology
The opto-electronic device manufactured with nanometer technique, its performance is significantly better than traditional electronic device, and it has as follows
Advantage: 1. operating rate is fast, and the operating rate of nano photoelectronic devices is 1000 times of silicon device, thus properties of product can be made big
Amplitude improves.The most low in energy consumption, the power consumption of micro-nano opto-electronic device is only the 1/1000 of silicon device.And along with mid-infrared (wavelength
3-30 μm) fast development of Science and Technology, the key micro-nano device to this wave band, including laser instrument, detector, manipulator
And the demand of types of functionality device is also constantly rising.
Polarization converter is the one of which Primary Component of mid-infrared technology.Electromagnetism Meta Materials due to can pass through structure,
Size and material etc. select the amplitude of centering infrared waves, phase place, polarize and propagate and realize flexile control, it is provided that one
Plant and realize dissimilar and parameter mid-infrared polarization converter device effective way.For the regulation and control of mid-infrared wave polarization state, can
To utilize the anisotropy of Meta Materials, chirality and double anisotropy to realize the change of mid-infrared wave polarization form, i.e. realize polarization
Conversion.
In prior art, Hua Cheng et al. proposes a kind of polarization converter based on L-type plasma flat antenna.
This technical scheme uses L-type Graphene, it is achieved that can be in the conversion of the line polarized light of single frequency vertical direction.
Jun Ding et al. is once based on proposing another kind of polarization converter based on L-type plasma flat antenna.This skill
Art scheme uses the L-type grooving of single-layer graphene, it is achieved that the conversion of the line polarized light of the vertical direction of two frequencies.
But current there is not yet the tunable polarization converter of mid-infrared multi-frequency on the market, and can not realize three
Frequency works simultaneously.
2004, Univ Manchester UK physicist An Deliehaimu and Constantine's Nuo Woxiao love, become
From graphite, isolate to merit Graphene in an experiment, thus confirm that it can be opened from this academia and engineering circles with individualism
Begun to Graphene application exploration.As a kind of electromagnetism Meta Materials, Graphene has become the research heat of mid-infrared technical field
Point.
The english abbreviation of optical rotation rate is PCR, and English is polarization conversion ratio.
Summary of the invention
For weak point present in above-mentioned technology, the present invention provides a kind of three frequencies to work tunable Graphenes
Polarization converter, this polarization converter have in working frequency range three can operating frequency, the optical rotation at each operating frequency
Rate is more than 75%, and two of which operating frequency is close to 100%, and polarization working band is tunable.
For achieving the above object, the present invention provides a kind of three frequencies tunable Graphene polarization converter of work, should
Polarization converter is made up of multiple polarization three-dimensional elements, and multiple polarization three-dimensional elements are horizontal positioned, and multiple polarization is three-dimensional single
The upper and lower surface of unit is all on same horizontal plane；
Each polarization three-dimensional element includes being positioned at the layer gold of the bottom, being positioned at the silicon dioxide sealing coat in intermediate layer and be positioned at
The graphene layer of layer topmost, described layer gold, silicon dioxide sealing coat and graphene layer three fix the most successively, and institute
State and on graphene layer, offer multiple punching.
Wherein, the thickness of described layer gold is about 0.1 μm, and the thickness of described silicon dioxide sealing coat is 1.1 μm, and it is situated between
Electric constant is 2.1.
Wherein, the preparation method of described graphene layer is: by the square Graphene of length of side p=0.175 μm, symmetry prescinds
This graphene layer is obtained after the rectangle Graphene of two pieces of wide w=65nm, long L=140nm, gathering d=10nm.
Wherein, the rectangle Graphene of described wide w=65nm, long L=140nm, gathering d=10nm is this punching；And
Described punching is rectangular-shaped；And between described punching and graphene layer, form ARROW structure.
Wherein, in the range of frequency 35THz-40.7THz, the optical rotation rate of this polarization converter has three peaks
Value；And these three peak value is respectively 35THz, 38THz and 40.7THz.
Wherein, the optical rotation rate of described peak value 35THz is about 80%；The optical rotation rate of described peak value 38THz connects
Nearly 100%, and the also optical rotation rate of described peak value 40.7THz is close to 100%.
The invention has the beneficial effects as follows: compared with prior art, three frequencies tunable stones of work that the present invention provides
Ink alkene polarization converter, polarization converter is made up of multiple polarization three-dimensional elements, and each polarization three-dimensional element includes being positioned at
The layer gold of bottom, it is positioned at the silicon dioxide sealing coat in intermediate layer and is positioned at the graphene layer of layer topmost, graphene layer is offered
There is multiple punching.The improvement of this structure so that this polarization converter have in working frequency range three can operating frequency, in each work
Optical rotation rate at working frequency is more than 75%, and two of which operating frequency is close to 100%, and polarization working band can
Tuning.
Accompanying drawing explanation
Fig. 1 is the structure chart polarizing three-dimensional element in the present invention；
Fig. 2 is the structure chart of three frequency tunable Graphene polarization converters of work in the present invention；
Fig. 3 is the structure chart of graphene layer in the present invention；
Fig. 4 is the PCR result figure of polarization converter in the present invention；
Fig. 5 is the reflectance design sketch of polarization converter in the present invention；
Fig. 6 is the PCR result figure after the fermi level regulation and control of polarization converter in the present invention；
Fig. 7 is the Distribution of Magnetic Field figure at three resonant frequencies of polarization converter in the present invention；
Fig. 8 is the absorption figure of polarization converter SOP-A and SOP-B in the present invention.
Main element symbol description is as follows:
1, polarization converter 10, polarization three-dimensional element
101, layer gold 102, silicon dioxide sealing coat
103, graphene layer 1031, punching.
Detailed description of the invention
In order to more clearly state the present invention, below in conjunction with the accompanying drawings the present invention is further described.
Refer to Fig. 1-3, three frequencies tunable Graphene polarization converters of work of the present invention, this polarization converter
1 be made up of multiple polarization three-dimensional elements 10, and multiple polarization three-dimensional elements 10 are in horizontal positioned, and multiple polarization three-dimensional element 10
Upper and lower surface is all on same horizontal plane；
Each polarization three-dimensional element 0 includes being positioned at the layer gold 101 of the bottom, being positioned at the silicon dioxide sealing coat in intermediate layer
102 and be positioned at the graphene layer 103 of layer topmost, layer gold 101, silicon dioxide sealing coat 102 and graphene layer 103 three by under
Supreme fix successively, and on graphene layer, offer multiple punching 1031.
Compared to the situation of prior art, three frequencies tunable Graphene polarization conversion of work that the present invention provides
Device, polarization converter 1 is made up of multiple polarization three-dimensional elements 10, and each polarization three-dimensional element 10 includes the gold that is positioned at the bottom
Layer 101, it is positioned at the silicon dioxide sealing coat 102 in intermediate layer and is positioned at the graphene layer 103 of layer topmost, on graphene layer 103
Offer multiple punching 1031.The improvement of this structure so that this polarization converter have in working frequency range three can operating frequency,
Optical rotation rate at each operating frequency is more than 75%, and two of which operating frequency is close to 100%, and polarization work
Make frequency band tunable.
In the present embodiment, the thickness of layer gold 101 is about 0.1 μm, and the thickness of silicon dioxide sealing coat 102 is 1.1 μm,
And its dielectric constant is 2.1.Certainly, this case is not limited to above-mentioned thickness, can improve according to actual needs.
Fig. 1 is the schematic three dimensional views of a unit of present invention polarization converter based on rectangular configuration；Actual polarization
Transducer is with this unit as cycle, to the effect of the 3X3 that the model extended around, such as Fig. 2 are given.The structure ratio of graphene layer
More complicated, the preparation method of graphene layer 103 is: by the square Graphene of length of side p=0.175 μm, and symmetry prescinds two pieces of wide w
This graphene layer is obtained after the rectangle Graphene of=65nm, long L=140nm, gathering d=10nm.Wide w=65nm, long L=
The rectangle Graphene of 140nm, gathering d=10nm is this punching；And punching is for rectangular-shaped；And between punching and graphene layer
Form ARROW structure.Finally give as shown in Figure 3.
PCR value is given further referring to Fig. 4, Fig. 4, as seen from the figure, in the range of frequency 35THz-40.7THz,
Optical rotation rate PCR of this polarization converter has three peak values；And these three peak value is respectively 35THz (A point), 38THz (B
Point) and three peak values of 40.7THz (C point).Wherein PCR peak A is about 80%, and the PCR of peak value B, C is close to 100%, it is meant that
The incident illumination of these three frequency excites the local plasmon resonance body in squaerial, incident illumination overwhelming majority quilt at formant
Given off the x line of direction polarized light being perpendicular to former polarization direction by the micro-nano structure on surface after it line absorption.Fig. 5 gives instead
Penetrate the result of calculation of rate, it can be seen that Rxx has minimum three frequencies, i.e. absorbed at three frequency x-polarisation light.And Ryx
There is maximum in three corresponding frequencies, illustrate that x polarisation is changed for y polarisation at these three frequency.Thus illustrate, by this
Polarization converter terahertz light can be three frequency generation polarization conversion.Exactly because the present invention have employed arrow-shaped antenna knot
Structure so that the quantity of mode of operation increases to three.
It is that (fermi level takes by changing the PCR result figure of fermi level tuning bandwidth further referring to Fig. 6, Fig. 6
0.6eV, 0.7eV, 0.8eV, 0.9eV, 1.0eV), along with fermi level increases, its operating bandwidth moves to right.This polarization converter energy
The reason that polarization conversion enough occurs can be illustrated by figure below.As it is shown in fig. 7, be that graphenic surface is at A, B, C the most respectively
Distribution of Magnetic Field at three resonant frequencies.It will be seen that for each resonant frequency, the magnetic field within arrow can be regarded as
The effect of coupling, i.e. graphenic surface plasma concussion is caused.Concrete proof formula is referred to document [3], Bludov
Y V,Vasilevskiy M I,Peres N M R.Tunable graphene-based polarizer[J].Journal
of Applied Physics,2012,112(8):084320-084320-5。
If as it is shown in fig. 7, via two bundle polarization directions with x-axis be respectively 45 degree (SOP-A) and-45 spend (SOP-B)
Incident illumination, graphenic surface plasma effect makes this two-beam have individual resonance absorption point, and if resonance absorption frequency
Very close to, then can couple, produce polarization conversion effect.This polarization converter such as Fig. 8 of result of calculation under such condition
Shown in.It can be seen that the resonance absorption point of two-beam very close to, and SOP-B has two resonance absorption frequency, meets document [2]
Pointed effect condition, thus prove that our device can occur three frequency polarization conversion further.The document is:
Jun Ding,et al.,Mid-Infrared Tunable Dual-Frequency Cross Polarization
Converters Using Graphene-Based L-Shaped Nanoslot Array,(2015)10:351–356。
Electromagnetic wave belongs to shear wave, and its electric vector, magnetic vector and wave vector direction meet the right-hand rule.Wherein, electric vector is
Cause carrier collective motion in conductor and cause the main cause of dielectric polorization.Therefore, it can by incident electromagnetic wave and
The ratio of reflection electromagnetic wave electric field intensity defines reflectance.Mutually orthogonal two polarization can be decomposed in view of electromagnetic wave
Direction, reflectance can be written as the form of reflection matrix
Wherein
X, y are two mutually orthogonal linear polarization electromagnetic wave directions, and i, r represent incident electromagnetic wave and reflection electromagnetism respectively
Ripple.The Rmn ratio equal to reflection electromagnetic wave m direction electric field component Emr and incident electromagnetic wave n direction electric field component Eni, φ mn is
Phase place.In our model, due to symmetry, therefore Rmn=Rnm
Phase contrast between definition Rxy and Rxy is:
If the linear polarization electromagnetic wave that incident electromagnetic wave is y direction, then optical rotation rate PCR can be written as
During Rxy=0, PCR=0, it is meant that y direction polarization incident illumination through reflection after without x direction polarized light, no polarization
Transition effects.During Ryy=0, PCR=1, it is meant that y direction polarization incident illumination through reflection after without y direction polarized light, i.e. institute
Reflection light is had to be x direction polarization, it is achieved that 100% conversion efficiency of the line polarized light of mutually perpendicular direction.0 < PCR < when 1,
Reflection light contains two kinds of polarization direction components, for elliptically polarized light.Directly reflect flat plane antenna due to PCR and realize polarization
Level, be therefore used as the main performance index of polarization converter.Above-mentioned for the computational methods of PCR in invention.And Fig. 4,
Fig. 5, Fig. 6 and Fig. 8 are the figures obtained by this calculation.
The several specific embodiments being only the present invention disclosed above, but the present invention is not limited to this, any ability
What the technical staff in territory can think change all should fall into protection scope of the present invention.
Claims (6)
1. three frequencies tunable Graphene polarization converter of work, it is characterised in that this polarization converter is by multiple
Polarization three-dimensional element composition, multiple polarization three-dimensional elements are horizontal positioned, and the upper and lower surface of multiple polarization three-dimensional element all exists
On same horizontal plane；
Each polarization three-dimensional element includes being positioned at the layer gold of the bottom, is positioned at the silicon dioxide sealing coat in intermediate layer and being positioned at and goes up most
The graphene layer of surface layer, described layer gold, silicon dioxide sealing coat and graphene layer three fix the most successively, and described stone
Multiple punching is offered on ink alkene layer.
Three frequencies tunable Graphene polarization converter of work the most according to claim 1, it is characterised in that described
The thickness of layer gold is about 0.1 μm, and the thickness of described silicon dioxide sealing coat is 1.1 μm, and its dielectric constant is 2.1.
Three frequencies tunable Graphene polarization converter of work the most according to claim 1, it is characterised in that described
The preparation method of graphene layer is: by the square Graphene of length of side p=0.175 μm, and symmetry prescinds two pieces of wide w=65nm, long L
This graphene layer is obtained after the rectangle Graphene of=140nm, gathering d=10nm.
Three frequencies tunable Graphene polarization converter of work the most according to claim 3, it is characterised in that described
The rectangle Graphene of wide w=65nm, long L=140nm, gathering d=10nm is this punching；And described punching is rectangular-shaped；
And between described punching and graphene layer, form ARROW structure.
Three frequencies tunable Graphene polarization converter of work the most according to claim 1, it is characterised in that at frequency
In the range of rate 35THz-40.7THz, the optical rotation rate of this polarization converter has three peak values；And these three peak value is respectively
For 35THz, 38THz and 40.7THz.
Three frequencies tunable Graphene polarization converter of work the most according to claim 5, it is characterised in that described
The optical rotation rate of peak value 35THz is about 80%；The optical rotation rate of described peak value 38THz is close to 100%, and described peak value
Also the optical rotation rate of 40.7THz is close to 100%.
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Cited By (5)
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| CN107240781A (en) * | 2017-07-14 | 2017-10-10 | 桂林电子科技大学 | A kind of broadband circle polarized converter of the frequency-tunable based on graphene |
| CN108777368A (en) * | 2018-06-08 | 2018-11-09 | 郑州航空工业管理学院 | Surpass the reflective circular polarization plane super lens on surface based on graphene |
| CN108802862A (en) * | 2018-06-08 | 2018-11-13 | 郑州航空工业管理学院 | A kind of reflective circular polarization plane super lens surpassing surface based on graphene |
| CN109491109A (en) * | 2018-12-27 | 2019-03-19 | 桂林电子科技大学 | A kind of adjustable polarization converter based on the double-deck G shape graphene micro-structure |
| CN110568624A (en) * | 2019-08-15 | 2019-12-13 | 复旦大学 | Polarization conversion device based on angular dispersion principle |
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| CN109491109A (en) * | 2018-12-27 | 2019-03-19 | 桂林电子科技大学 | A kind of adjustable polarization converter based on the double-deck G shape graphene micro-structure |
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