CN106547121A - A kind of light polarization transducer based on Graphene - Google Patents
A kind of light polarization transducer based on Graphene Download PDFInfo
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- CN106547121A CN106547121A CN201710037533.0A CN201710037533A CN106547121A CN 106547121 A CN106547121 A CN 106547121A CN 201710037533 A CN201710037533 A CN 201710037533A CN 106547121 A CN106547121 A CN 106547121A
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- graphene
- metal electrode
- dielectric substrate
- band array
- 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
Abstract
A kind of light polarization transducer based on Graphene, including dielectric substrate, upper dielectric substrate, upper metal electrode, upper graphene band array, silicon dioxide layer, lower graphene band array, lower dielectric substrate, lower metal electrode；Upper dielectric substrate 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；Lower metal electrode and lower dielectric substrate are arranged on the lower section of lower graphene band array side by side and are overlapped with all graphene bands of lower graphene band array, accompany silicon dioxide between lower metal electrode and lower dielectric substrate.The present invention regulates and controls the light vector size and phase place of transmitted light by the fermi level of grid voltage regulation Graphene, realizes the active control to polarization state, and fast response time.
Description
Technical field
The present invention relates to a kind of optics, more particularly to a kind of light polarization transducer based on Graphene.
Background technology
Graphene is the cellular two-dimensional layer crystal formed by the carbon atom close-packed arrays of sp2 hydridization,It has super
The optic response spectrum in broadband, extremely strong nonlinear optical properties and the compatibility with silicon-based semiconductor technique so as to new
Optics and field of photoelectric devices have advantageous advantage.Under certain condition, graphenic 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,
The information carrier in LMDS Light Coupled Device can be made.The maximum advantage of couple electromagnetic mould is that its propagation constant can pass through external electrical field
（Or magnetic field）Or the mode of chemical doping is adjusted.
Traditional light polarization switching device（Such as half-wave plate, quarter-wave plate etc.）There is size larger, untunable etc.
Weak point.
The content of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, there is provided a kind of size is little, line can be made inclined
The light that shakes is converted to the light polarization transducer based on Graphene of left-handed or right-circularly polarized light.
To solve above-mentioned technical problem, technical scheme proposed by the present invention is：A kind of light polarization based on Graphene is changed
Device, including dielectric substrate, upper dielectric substrate, upper metal electrode, upper graphene band array, silicon dioxide layer, lower graphene strips
Band array, lower dielectric substrate, lower metal electrode；The upper dielectric substrate 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
Row and lower graphene band array direction are mutually perpendicular to, and sandwich silicon dioxide layer；The lower metal electrode and lower electricity
Solution matter layer is arranged on the lower section of lower graphene band array and all graphene strips with lower graphene band array side by side
Band overlaps, and accompanies silicon dioxide between lower metal electrode and lower dielectric substrate；Lower metal electrode and lower dielectric substrate position
In dielectric substrate.
In the present invention, the polarization direction of a branch of linear polarization incident illumination and upper graphene band array direction or lower graphite
When alkene band array direction is consistent, transmitted light is also line polarized light, and polarization direction will not change.In characteristic frequency
Under, upper graphene band array or lower graphene band array are in responsive state（That is surface phasmon response）, ringing
Answer near wavelength, the phase place of transmitted light occurs drastically to change.If adjusting the polarization direction of incident illumination, can make along upper graphene band
The light vector of array direction and lower graphene band array direction transmitted light is equal in magnitude, and the phase contrast in two directions is 900Or-
900；So, transmitted light becomes for dextrorotation or left-handed circularly polarized light.
Upper dielectric substrate and upper metal electrode and lower graphene band in the present invention, above upper graphene band array
Lower dielectric substrate and lower metal electrode below array constitutes grid structure.Change the upper and lower layer graphene of gate voltage scalable to take
Rice energy level, the change of Graphene fermi level affects the response wave length and phase place change of graphene band array, thus not
In the case of changing structural parameters, line polarized light is converted to dextrorotation or Left-hand circular polarization luminous energy realizes active control.
The above-mentioned light polarization transducer based on Graphene, it is preferred that between the lower metal electrode and lower dielectric substrate
Filled with silicon dioxide.
The above-mentioned light polarization transducer based on Graphene, it is preferred that the upper metal electrode, lower metal electrode, upper electricity
The thickness of solution matter layer and lower dielectric substrate is 100-1000nm.
The above-mentioned light polarization transducer based on Graphene, it is preferred that the upper metal electrode and lower metal electrode are gold
Or silver.The electrical conductivity of golden and silver is high, and its plasticity is also high, and reduction that can be as much as possible is lost and reduces what is made
Trouble.
The above-mentioned light polarization transducer based on Graphene, it is preferred that the substrate is silicon carbide layer.
The above-mentioned light polarization transducer based on Graphene, it is preferred that the thickness of the substrate is 200-1000nm.
The above-mentioned light polarization transducer based on Graphene, it is preferred that the upper graphene band array and lower Graphene
The cycle of band array is 50-200nm.
Compared with prior art, it is an advantage of the current invention that：（1）The present invention is added based on micro-nano etching extremely ripe at present
Work technology and multilayer technique, technological process be not numerous and diverse, simple to operate.With traditional compared with frequency range polarizer, graphite
The introducing of alkene greatly reduces the size of polarizer.（2）The present invention by grid voltage adjust Graphene fermi level come
The absorbance and phase place of regulation and control light, realizes the active control to polarization state, and fast response time.
Description of the drawings
Fig. 1 is structural representation of the present invention based on the light polarization transducer of Graphene.
Fig. 2 is the transmission spectrum in embodiment 1.
Fig. 3 is line polarized light transmission light phase and two transmission light phases after the transducer of the present invention in embodiment 1
Graph of a relation between difference and wavelength.
Fig. 4 is the transmission spectrum in embodiment 2.
Fig. 5 is line polarized light transmission light phase and two transmission light phases after the transducer of the present invention in embodiment 2
Graph of a relation between difference and wavelength.
Marginal data
1st, upper dielectric substrate；2nd, upper metal electrode；3rd, upper graphene band array；4th, silicon dioxide layer；5th, lower dielectric substrate；6、
Lower metal electrode；7th, lower graphene band array；8th, substrate.
Specific embodiment
For the ease of understanding the present invention, present invention work more comprehensively, is meticulously described below in conjunction with preferred embodiment,
But protection scope of the present invention is not limited to embodiment in detail below.
It should be strongly noted that when a certain element, to be described as " be fixed on, be fixed in, be connected to or be communicated in " another
When on element, it can be directly fixed, affixed, connection or connect on another element, or by connecting in the middle of other
Fitting is indirectly fixed, affixed, connection or connection are on another element.
Unless otherwise defined, the implication that all technical terms used hereinafter are generally understood that with those skilled in the art
It is identical.Technical term used herein is intended merely to the purpose for describing specific embodiment, is not intended to limit the present invention
Protection domain.
Embodiment 1
A kind of light polarization transducer based on Graphene as shown in Figure 1, upper dielectric substrate 1, upper metal electrode 2, lower electrolyte
The thickness of layer 5 and lower metal electrode 6 is 300 nm, and upper graphene band array 3, the cycle of lower graphene band array 7 be
80nm, in the present embodiment, upper metal electrode 2 and lower metal electrode 6 are gold.Upper graphene band array 3 and lower graphene band
The Graphene width of array 7 is respectively 50 and 48 nm, and the thickness of 8 carborundum of silicon dioxide layer 4 and substrate is respectively 10 and 500
nm.The carrier mobility and Fermi velocity of Graphene is respectively 20000 cm2/（Vs）With 106m/s.Adjust gate voltage Vg1、
Vg2Graphene band array 3 and the corresponding fermi level of lower graphene band array 7 is made to be 0.6 eV.When a branch of wavelength position
In infrared band, along x（y）During the linear polarization directional light vertical incidence electrolyte of direction polarization, transmitted light is also along x（y）Direction
The line polarized light of polarization, transmission spectrum are as shown in Figure 2.In Fig. 2, x, y direction line polarized light correspondence spectral line TxAnd TYThere is a transmission
Paddy, the transmission paddy correspondence graphenic surface phasmon response.Two spectral line joining transmission value is equal（Light vector size phase
Deng）, joining wavelength is 7.78 microns.Fig. 3 depicts transmission light phase of the x and y directions line polarized light after structure（I.e.
ФxAnd Фy）And two transmitted light phase contrasts（That is Δ Ф=Фy—Фx）Relation between wavelength.In 7.78 micron wave length positions
Put, two transmitted light phase differences Ф are -900, show that y directions line polarized light phase place falls behind x directions line polarized light 900.From above
Data we understand：If a wavelength is 7.78 microns of linear polarization incident illumination vertical incidence said structure, and polarization direction and x
Axle is into 450Angle, incident illumination now can be analyzed to two beams light equal-sized along x and y directions light vector, and phase place 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 sum, a wavelength is 7.78 micro wire polarized incident lights under above-mentioned parameter situation, and 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 respectively by grid electricity
Pressure Vg1And Vg2It is adjusted.When the fermi level of 3 array of upper graphene band and lower graphene band array 7 is respectively 0.62
During with 0.53eV, the transmission spectrum T of x, y direction polarized lightxAnd TYWith phase place change respectively as shown in Figure 4 and Figure 5.It is different from Fig. 2
, two transmit spectral line intersection locations has sent out change（Intersection point corresponding wavelength is 7.99 microns）, two transmitted light phase contrasts now
Δ Ф is 900（Fig. 5）；Illustrate the advanced x directions line polarized light of y directions line polarized light 900.Analysis like above, we can obtain
To such as drawing a conclusion：One wavelength is 7.99 microns, polarization direction and x-axis are into 450The above-mentioned knot of linear polarization incident illumination 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 transducer based on Graphene, it is characterised in that：Including dielectric substrate, upper dielectric substrate, upper metal
Electrode, upper graphene band array, silicon dioxide layer, lower graphene band array, lower dielectric substrate, lower metal electrode；It is described
Upper dielectric substrate 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；Graphene band array under the lower metal electrode and arranged side by side being arranged on of lower dielectric substrate
Lower section and overlap with all graphene strips of lower graphene band array；Lower metal electrode and lower dielectric substrate position
In dielectric substrate.
2. the light polarization transducer based on Graphene according to claim 1, it is characterised in that：The lower metal electrode and
Silicon dioxide is filled between lower dielectric substrate.
3. the light polarization transducer based on Graphene according to claim 2, it is characterised in that：The upper metal electrode,
The thickness of lower metal electrode, upper dielectric substrate and lower dielectric substrate is 100-1000nm.
4. the light polarization transducer based on Graphene according to claim 1, it is characterised in that：The upper metal electrode and
Lower metal electrode is gold or silver.
5. the light polarization transducer based on Graphene according to claim 1, it is characterised in that：The substrate is carbonization
Silicon.
6. the light polarization transducer based on Graphene according to claim 5, it is characterised in that：The thickness of the substrate is
200-1000nm。
7. the light polarization transducer based on Graphene according to claim 1, it is characterised in that：The upper graphene band
The cycle of array and lower graphene band array is 50-200nm.
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Cited By (5)
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| CN108110433A (en) * | 2017-11-22 | 2018-06-01 | 桂林电子科技大学 | Surpass the multi-functional THz polarization converters on surface based on graphene-metal mixed |
| CN108267869A (en) * | 2017-12-28 | 2018-07-10 | 华南师范大学 | Adjustable optical attenuator and device based on the double graphene nanobelts of antarafacial |
| CN108646325A (en) * | 2018-05-07 | 2018-10-12 | 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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| 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108110433A (en) * | 2017-11-22 | 2018-06-01 | 桂林电子科技大学 | Surpass the multi-functional THz polarization converters on surface based on graphene-metal mixed |
| 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 |
| CN108267869A (en) * | 2017-12-28 | 2018-07-10 | 华南师范大学 | Adjustable optical attenuator and device based on the double graphene nanobelts of antarafacial |
| 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 |
| CN108646325A (en) * | 2018-05-07 | 2018-10-12 | 厦门大学 | A kind of adjustable graphene wide angle Terahertz wave absorbing device of frequency |
| 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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