CN106547121B - A kind of light polarization converter based on graphene - Google Patents
A kind of light polarization converter based on graphene Download PDFInfo
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- CN106547121B CN106547121B CN201710037533.0A CN201710037533A CN106547121B CN 106547121 B CN106547121 B CN 106547121B CN 201710037533 A CN201710037533 A CN 201710037533A CN 106547121 B CN106547121 B CN 106547121B
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- graphene
- metal electrode
- band array
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- graphene band
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0136—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/008—Surface plasmon devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A kind of light polarization converter based on graphene, including dielectric substrate, upper electrolyte layer, upper metal electrode, upper graphene band array, silicon dioxide layer, lower graphene band array, lower electrolyte layer, lower metal electrode；Upper electrolyte layer and upper metal electrode are disposed in parallel in the top of graphene band array, and overlap with all graphene bands of upper graphene band array；Upper graphene band array and lower graphene band array direction are mutually perpendicular to, and sandwich silicon dioxide layer；The lower section of lower graphene band array is arranged in side by side and overlaps with all graphene bands of lower graphene band array for lower metal electrode and lower electrolyte layer, accompanies silica between lower metal electrode and lower electrolyte layer.The present invention adjusts the fermi level of graphene by grid voltage to regulate and control the light vector size and phase of transmitted light, realizes the active control to polarization state, and fast response time.
Description
Technical field
The present invention relates to a kind of optical device more particularly to a kind of light polarization converters based on graphene.
Background technique
Graphene is the carbon atom close-packed arrays by sp2 hydridization and the honeycomb two-dimensional layer crystal formed,It has super
Optic response spectrum, extremely strong nonlinear optical properties and the compatibility with silicon-based semiconductor technique in broadband, make it novel
Optics and field of photoelectric devices have advantageous advantage.Under certain condition, graphene surface conduction electronics and photon phase
Interaction forms couple electromagnetic mould (that is, surface phasmon).Couple electromagnetic mould locality is very strong, can break through diffraction limit,
It can make the information carrier in LMDS Light Coupled Device.The maximum advantage of couple electromagnetic mould is that its propagation constant can pass through external electrical field
The mode of (or magnetic field) or chemical doping is adjusted.
That there are sizes is larger, untunable etc. for traditional light polarization switching device (such as half-wave plate, quarter-wave plate etc.)
Shortcoming.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide that a kind of size is small, line can be made inclined
Vibration light is converted to left-handed or right-circularly polarized light the light polarization converter based on graphene.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows: a kind of light polarization conversion based on graphene
Device, including dielectric substrate, upper electrolyte layer, upper metal electrode, upper graphene band array, silicon dioxide layer, lower graphene strips
Band array, lower electrolyte layer, lower metal electrode；The upper electrolyte layer and upper metal electrode are disposed in parallel in graphene band
The top of array, and overlap with all graphene strips of upper graphene band array；The upper graphene band battle array
Column and lower graphene band array direction are mutually perpendicular to, and sandwich silicon dioxide layer；The lower metal electrode and lower electricity
The lower section of lower graphene band array and all graphene strips with lower graphene band array are arranged in solution matter layer side by side
Band overlaps, and accompanies silica between lower metal electrode and lower electrolyte layer；Lower metal electrode and lower electrolyte layer position
In in dielectric substrate.
In the present invention, the polarization direction of a branch of linear polarization incident light and upper graphene band array direction or lower graphite
When alkene band array direction is consistent, transmitted light is also linearly polarized light, and polarization direction will not change.In specific frequency
Under, upper graphene band array or lower graphene band array are in responsive state (i.e. surface phasmon response), in sound
It answers near wavelength, change dramatically occurs for the phase of transmitted light.If adjusting the polarization direction of incident light, can make along upper graphene band
Array direction and the light vector of lower graphene band array direction transmitted light are equal in magnitude, and the phase difference in two directions is 900Or-
900；In this way, transmitted light has become dextrorotation or left-handed circularly polarized light.
Upper electrolyte layer and upper metal electrode and lower graphene band in the present invention, above upper graphene band array
Lower electrolyte layer and lower metal electrode below array constitute gate structure.Change gate voltage and upper and lower layer graphene expense is adjusted
Rice energy level, the variation of graphene fermi level affects the response wave length and phase change of graphene band array, thus not
In the case of changing structural parameters, linearly polarized light is converted to dextrorotation or left circularly polarized light is able to achieve active control.
The above-mentioned light polarization converter based on graphene, it is preferred that between the lower metal electrode and lower electrolyte layer
Filled with silica.
The above-mentioned light polarization converter based on graphene, it is preferred that the upper metal electrode, powers on lower metal electrode
Solve matter layer and lower electrolyte layer with a thickness of 100-1000nm.
The above-mentioned light polarization converter based on graphene, it is preferred that the upper metal electrode and lower metal electrode are gold
Or silver.The conductivity of gold and silver is high, and its plasticity is also high, can as much as possible reduce loss and reduce production
Trouble.
The above-mentioned light polarization converter based on graphene, it is preferred that the substrate is silicon carbide layer.
The above-mentioned light polarization converter based on graphene, it is preferred that the substrate with a thickness of 200-1000nm.
The above-mentioned light polarization converter based on graphene, it is preferred that the upper graphene band array and lower graphene
The period of band array is 50-200nm.
Compared with the prior art, the advantages of the present invention are as follows: (1) the present invention is based at present extremely mature micro-nano etching add
Work technology and multilayer technique, process flow is not many and diverse, easy to operate.With traditional compared with frequency range polarizer, graphite
The introducing of alkene greatly reduces the size of polarizer.(2) present invention by grid voltage adjust graphene fermi level come
The transmissivity and phase for regulating and controlling light, realize the active control to polarization state, and fast response time.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural schematic diagrams of the light polarization converter of graphene.
Fig. 2 is the transmission spectrum in embodiment 1.
Fig. 3 is to transmit light phase and two transmission light phases in embodiment 1 after the converter of linearly polarized light through the invention
Relational graph between difference and wavelength.
Fig. 4 is the transmission spectrum in embodiment 2.
Fig. 5 is to transmit light phase and two transmission light phases in embodiment 2 after the converter of linearly polarized light through the invention
Relational graph between difference and wavelength.
Marginal data
1, upper electrolyte layer；2, upper metal electrode；3, upper graphene band array；4, silicon dioxide layer；5, lower electrolyte
Layer；6, lower metal electrode；7, lower graphene band array；8, substrate.
Specific embodiment
To facilitate the understanding of the present invention, present invention work more comprehensively, is meticulously described below in conjunction with preferred embodiment,
But the protection scope of the present invention is not limited to the following specific embodiments.
It should be strongly noted that when to be described as " be fixed on, be fixed in, be connected to or be connected to " another for a certain element
When on element, it can be directly fixed, affixed, connection or is connected on another element, be also possible to by connecting among other
Fitting is indirectly fixed, affixed, connects or is connected on another element.
Unless otherwise defined, all technical terms used hereinafter and the normally understood meaning of those skilled in the art
It is identical.Technical term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention
Protection scope.
Embodiment 1
A kind of light polarization converter based on graphene as shown in Figure 1, upper electrolyte layer 1, upper metal electrode 2, lower electricity
Solve matter layer 5 and lower metal electrode 6 with a thickness of 300 nm, the period of upper graphene band array 3, lower graphene band array 7
It is 80nm, in the present embodiment, upper metal electrode 2 and lower metal electrode 6 are gold.Upper graphene band array 3 and lower graphene
The graphene width of band array 7 is respectively 50 and 48 nm, and the thickness of 8 silicon carbide of silicon dioxide layer 4 and substrate is respectively 10 Hes
500 nm.The carrier mobility and Fermi velocity of graphene are respectively 20000 cm2/ (Vs) and 106m/s.Adjust gate voltage
Vg1、Vg2The correspondence fermi level of graphene band array 3 and lower graphene band array 7 is set to be 0.6 eV.When a branch of wave
It is long to be located at infrared band, along x(y) the linear polarization directional light vertical incidence electrolyte of direction polarization when, transmitted light is also along x(y)
The linearly polarized light of direction polarization, transmission spectrum are as shown in Figure 2.In Fig. 2, the direction x, y linearly polarized light corresponds to spectral line TxAnd TYThere is one
Paddy is transmitted, which corresponds to the response of graphene surface phasmon.Equal (the light vector size of two spectral line crosspoint transmission values
It is equal), crosspoint wavelength is 7.78 microns.Fig. 3 depicts the direction x and y linearly polarized light by the transmission light phase after structure (i.e.
ФxAnd Фy) and two transmitted light phase difference (i.e. Δ Ф=Фy—Фx) and wavelength between relationship.In 7.78 micron wave length positions
It sets, two transmitted light phase difference Ф are -900, show that the direction y linearly polarized light phase falls behind the direction x linearly polarized light 900.From above
Data are known to us: if the linear polarization incident light vertical incidence above structure that a wavelength is 7.78 microns, and polarization direction and x
Axis is at 450Angle, incident light at this time can be analyzed to along the equal-sized two beams light of the direction x and y light vector, and phase is identical, should
The light vector size of the corresponding transmitted light of two beam light also can be identical, but phase difference Ф is -900, become after the synthesis of two light vectors
One left circularly polarized light.In conclusion a wavelength is 7.78 micro wire polarized incident lights under above-mentioned parameter situation, transmitted light turns
A left circularly polarized light is changed into.
Embodiment 2: the fermi level of upper graphene band array 3 and lower graphene band array 7 can pass through grid electricity respectively
Press Vg1And Vg2It is adjusted.When the fermi level of upper 3 array of graphene band and lower graphene band array 7 is respectively 0.62
When with 0.53eV, the transmission spectrum T of the direction x, y polarised lightxAnd TYDistinguish with phase change as shown in Figure 4 and Figure 5.It is different from Fig. 2
, two, which transmit spectral line intersection locations, has sent out variation (intersection point corresponding wavelength is 7.99 microns), two transmitted light phase differences at this time
Δ Ф is 900(Fig. 5)；Illustrate the advanced direction the x linearly polarized light 90 of the direction y linearly polarized light0.Analysis like above, we can obtain
To such as drawing a conclusion: a wavelength is 7.99 microns, polarization direction and x-axis are at 450The above-mentioned knot of linear polarization incident light vertical incidence at angle
Structure, transmitted light are a right-circularly polarized light.
The other parts of the present embodiment are same as Example 1.
Claims (7)
1. a kind of light polarization converter based on graphene, it is characterised in that: including dielectric substrate, upper electrolyte layer, upper metal
Electrode, upper graphene band array, silicon dioxide layer, lower graphene band array, lower electrolyte layer, lower metal electrode；It is described
Upper electrolyte layer and upper metal electrode are disposed in parallel in the top of graphene band array, and with upper graphene band array
All graphene strips overlap；The upper graphene band array and lower graphene band array direction are mutually perpendicular to,
And sandwich silicon dioxide layer；The lower metal electrode and the setting arranged side by side of lower electrolyte layer are in lower graphene band array
Lower section and overlap with all graphene strips of lower graphene band array；Lower metal electrode and lower electrolyte layer position
In in dielectric substrate；Upper electrolyte layer and upper metal electrode and lower graphene band array above upper graphene band array
The lower electrolyte layer of lower section and lower metal electrode constitute gate structure, and the gate voltage between upper electrolyte layer and upper metal electrode is
Vg1, the gate voltage between lower electrolyte layer and lower metal electrode is Vg2。
2. the light polarization converter according to claim 1 based on graphene, it is characterised in that: the lower metal electrode and
Silica is filled between lower electrolyte layer.
3. the light polarization converter according to claim 2 based on graphene, it is characterised in that: the upper metal electrode,
Lower metal electrode, upper electrolyte layer and lower electrolyte layer with a thickness of 100-1000nm.
4. the light polarization converter according to claim 1 based on graphene, it is characterised in that: the upper metal electrode and
Lower metal electrode is gold or silver.
5. the light polarization converter according to claim 1 based on graphene, it is characterised in that: the substrate is carbonization
Silicon.
6. the light polarization converter according to claim 5 based on graphene, it is characterised in that: the substrate with a thickness of
200-1000nm。
7. the light polarization converter according to claim 1 based on graphene, it is characterised in that: the upper graphene band
The period of array and lower graphene band array is 50-200nm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108110433B (en) * | 2017-11-22 | 2024-04-12 | 桂林电子科技大学 | Multifunctional THz polarization converter based on graphene-metal mixed super surface |
| CN108267869B (en) * | 2017-12-28 | 2023-05-26 | 华南师范大学 | Adjustable optical attenuator and device based on different-surface double graphene nanoribbons |
| CN108646325B (en) * | 2018-05-07 | 2019-09-20 | 厦门大学 | A kind of adjustable graphene wide angle Terahertz wave absorbing device of frequency |
| 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 |
| CN110221365A (en) * | 2019-05-13 | 2019-09-10 | 浙江大学 | A kind of reflection type polarization switching device of Terahertz frequency range |
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| CN104730738A (en) * | 2015-03-10 | 2015-06-24 | 电子科技大学 | Polarization controller based on graphene |
| CN105700201A (en) * | 2016-01-30 | 2016-06-22 | 中南林业科技大学 | Optical filter based on graphene |
| CN106129543A (en) * | 2016-08-17 | 2016-11-16 | 桂林电子科技大学 | A kind of difunctional polarization converter based on Graphene DC contact |
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| US10620431B2 (en) * | 2013-01-29 | 2020-04-14 | The Trustees Of Columbia University In The City Of New York | System, method and computer-accessible medium for depth of field imaging for three-dimensional sensing utilizing a spatial light modulator microscope arrangement |
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| CN104730738A (en) * | 2015-03-10 | 2015-06-24 | 电子科技大学 | Polarization controller based on graphene |
| CN105700201A (en) * | 2016-01-30 | 2016-06-22 | 中南林业科技大学 | Optical filter based on graphene |
| CN106129543A (en) * | 2016-08-17 | 2016-11-16 | 桂林电子科技大学 | A kind of difunctional polarization converter based on Graphene DC contact |
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