CN108363221A - Adjustable long wave flow-through optical filter based on graphene - Google Patents

Adjustable long wave flow-through optical filter based on graphene Download PDF

Info

Publication number
CN108363221A
CN108363221A CN201810057823.6A CN201810057823A CN108363221A CN 108363221 A CN108363221 A CN 108363221A CN 201810057823 A CN201810057823 A CN 201810057823A CN 108363221 A CN108363221 A CN 108363221A
Authority
CN
China
Prior art keywords
filter
metal electrode
optical
graphene
layer
Prior art date
Application number
CN201810057823.6A
Other languages
Chinese (zh)
Other versions
CN108363221B (en
Inventor
刘忠范
刘开辉
周旭
陈珂
Original Assignee
北京大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 北京大学 filed Critical 北京大学
Priority to CN201810057823.6A priority Critical patent/CN108363221B/en
Publication of CN108363221A publication Critical patent/CN108363221A/en
Application granted granted Critical
Publication of CN108363221B publication Critical patent/CN108363221B/en

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/0009Materials therefor
    • G02F1/0018Electro-optical materials
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/0102Constructional details

Abstract

The present invention provides a kind of optical filter that the long wave of the adjustable wavelength range based on graphene passes through type.The device covers graphene film on optical window surface, covers ionic liquid or ionic gel on the surface of graphene, draws electrode from graphene and optical window and be connected to voltage source.The light transmission rate of certain particular range of wavelengths is adjusted by adjusting voltage and the fermi level of graphene can be changed, adjust the position of filter cut-off wavelength, light more than filter cut-off wavelength will be emitted by optical filter from the other side, light less than cutoff wavelength does not pass through, and finally realizes that adjustable long wave passes through type optical filter.First compare with traditional optical filter, the cutoff wavelength range of optical filter provided by the invention is adjustable, it is low in energy consumption the features such as, replacement conventional filters can be facilitated, can be widely applied to optical engineering, the fields such as optical instrument.

Description

Adjustable long wave flow-through optical filter based on graphene

Technical field

The present invention relates to a kind of optical device, the optical filter for passing through type more particularly to a kind of long wave.

Background technology

Optical filter (or filter) can be such that the light of specific wavelength passes through, the light reflection of other wavelength, decaying or suction The optical component of receipts.Optical filter is essential basic optical component in optical engineering and optical instrument.From structure and It is said in principle, general optical filter is divided into piece colour glass filter (including coloured plastics and film optical filter) and deielectric-coating Optical filter;Colour glass filter belongs to absorption-type optical filter, and dielectric coating filter belongs to interference-type optical filter.Functionally, Optical filter can be divided into notch-type, bandpass-type, shortwave flow-through and long wave flow-through.Light passes through coloured glass (coloured plastics or film) When optical filter, the light of same color is absorbed by glass, and the light of other colors passes through.And it is in optical window to interfere mode filter then Made of the surface deposition multilayer optical material preparation of mouth, light interferes cancellation between these optical material layers or mutually length reaches filter Wave effect.Under normal conditions, there are several medium membrane stacks by spacing layer separates, and medium membrane stack is by a large amount of high and low refractive index Alternate dielectric layer composition.Two medium membrane stacks and intermediate wall form Fabry-Perot cavity structure.By adjusting method cloth In-Perot cavity configuration can make the interference of light cancellation (weaken transmission increase intensity of reflected light) or interference phase of specific wavelength Long (increasing transmitted intensity).Allow the light near certain specific wavelength not pass through, the light of other wavelength by filter be referred to as Trap mode filter, conversely, being then referred to as bandpass filter.Light more than certain specific wavelength is allowed to pass through, and wavelength light below Not by filter be referred to as long-pass type filter, conversely, then be referred to as short flow-through filter.Optical filter (or filter) is in light Engineering is learned, optic analytical instrument, optical detector etc. is all widely used, for example photographs, electrical lighting, infrared spectrum Detect skill, infrared thermoviewer, Raman spectrometer, laser etc..

Graphene is a kind of emerging in recent years carbon material, only there are one atomic thickness, about 0.3 nanometer.It has extremely Excellent optics, electrically and thermally property, and there is very high mechanical strength, electric conductivity has simultaneously than copper and silver-colored higher There are extraordinary thermal conductivity and thermal stability, 97.7% is up in visible and infrared band transparency.Therefore, it is in electronics It learns, the fields such as optics have very huge application prospect.Since Special Linear chromatic dispersion structure is presented in the electron energy band of graphene, So it is a kind of semiconductor or semimetal of zero band gap.Graphene is clear flexible material, but it is in very wide spectrum Range still has constant absorptance (≈ 2.3%).Fermi level position by adjusting graphene can adjust certain spectrum The absorptance (or transmissivity) of range.General method is using graphene as FET device (Field Effect transistor, FET) channel material, by change grid voltage (top-gated or back grid structure), and then change Graphene carriers concentration (electronics or hole), and the change of carrier concentration just corresponds to moving up and down for fermi level. When the energy of incident photon is less than the half of fermi level knots modification, the electronics that valence band can not be excited, light is just not It is absorbed, it is on the contrary then absorbed.When energy level is occupied by an electron at the energy more than the incident photon conduction band of more than half, due to Pauli's exclusion principle, incident photon can not excite electronics or the hole of corresponding energy that cannot be inhaled so as to cause the photon It receives, conversely, can then be absorbed.That is, the photon of wavelength longer (energy is smaller) can be by adjusting fermi level without quilt It absorbs, the photon of wavelength shorter (energy is larger) is then absorbed.To sum up, by changing graphene field effect transistor knot Grid voltage in structure can adjust the light transmittance of graphene.

Ionic liquid regulating and controlling voltage technology is a kind of effective carrier concentration and electric field strength for adjusting two-dimentional channel material Technology, it is widely used in electronics and electrochemical device.Ionic liquid is completely by ion (usually nitrogenous organic cation And inorganic anion) composition high degree of polarization and with low melting point binary salt.Ionic liquid has heat and chemical stability It is high, non-volatile, it is nontoxic, it is not volatile, room temperature present liquid and it is transparent the features such as.Ionic liquid in its electrochemical window not Redox reaction can occur, and since it can form the electric double layer knot of very thin (about several nanometers) under electric field action Structure, so being highly suitable as the dielectric layer and grid material of field-effect transistor.Ionic liquid can be by mixing polycyclic oxygen One or more systems in ethane (PEO), triblock polymer [PS-PMMA-PS] or triblock polymer [PS-PEO-PS] At ionic gel.Ionic gel is in gel state, is not easy to flow, belongs to another form of ionic liquid, be also very suitable for Make grid material.The relative dielectric constant of ionic liquid is probably between 1-10, and the thickness of its dielectric layer is about several Nanometer, about 10 μ F/cm of capacitance2(three magnitudes bigger than the capacitance of 300nm thick silicon dioxide dielectric layers), therefore regulate and control low-dimensional materials Carrier concentration can reach 1015cm-2(two orders of magnitude bigger than the carrier concentration of silica dioxide medium layer regulation and control). Moreover, ionic liquid only need several volts voltage can controlled material carrier concentration, and silicon dioxide dielectric layers need Want tens up to a hundred volts of voltages.Therefore, ionic liquid has many advantages, such as efficiently as electro-optical device electrode material, low-loss.

So, can be fabricated to one kind by the light transmittance of change graphene using ionic liquid regulating and controlling voltage technology can The optical filter of the long wave flow-through of adjusting wavelength range.Current various optical filters are in organic glass dyeing or optical substrate Plating deielectric-coating is made, its wave-length coverage to filter can not be adjusted after formed product, can only be by using different filters The filter plate of optical range is applied in combination and then reaches using purpose.Meanwhile organic glass dyes and dielectric layer coating process right and wrong It is often fine, it expends and expensive technology.So with regard to being badly in need of wanting a kind of filter wavelength range adjustable, cheap filter comes Meet actual demand.Therefore, the long wave of this adjustable wavelength range based on graphene of Patent design of the present invention passes through type Optical filter.

Invention content

Patent purpose of the present invention is to provide a kind of optical filtering that the long wave of the adjustable wavelength range based on graphene passes through type Device.

A kind of optical filter based on graphene, the optical filter include one or more filter elements, the optical filter Unit includes the second optical window stacked gradually in the stacking direction, graphene layer, metal electrode layer, ionic liquid layer and first Optical window.

A method of the adjustable long wave flow-through filter elements based on graphene being prepared, the optical filter includes one Or multiple filter elements, the filter elements include the second optical window stacked gradually in the stacking direction, graphene layer, Metal electrode layer, ionic liquid layer and the first optical window, wherein the metal electrode layer includes the first metal electrode and second Metal electrode, the method include the following steps:

1) graphene layer is covered in the second optical window upper surface;

2) the first metal electrode and lead are made on the graphene layer of gained;

3) the second metal electrode and lead are made on the optical window surface;

4) ionic liquid layer is covered in the graphene layer and metal electrode layer surface;

5) the first optical window is covered in ionic liquid layer;

6) first metal electrode is grounded, and voltage source the two poles of the earth is respectively connected to the second metal electrode, obtained The adjustable long wave flow-through filter elements based on graphene.

Optical filter provided by the invention based on graphene, is achieved through the following technical solutions:

1) single layer or multi-layer graphene are either grown in an optical window surface transfer.

2) metal electrode and lead are made on the graphene described in step 1) and optical window 1.

3) ionic liquid is covered on the graphene described in step 1) and optical window 1, makes ionic liquid and metal electrode 1 Contact.

4) other one layer of optical window 2 is covered on the ionic liquid described in step 3).

5) metal electrode described in step 2) is connected to voltage source by lead, obtains described one kind and is based on graphene Adjustable long wave flow-through filter elements.

6) filter elements described in multiple steps 5) are used in series, are obtained described a kind of based on the adjustable of graphene Save long wave flow-through optical filter.

7) light transmission rate of certain particular range of wavelengths is adjusted by adjusting voltage and the fermi level of graphene can be changed, The position for adjusting filter cut-off wavelength, the light for being more than filter cut-off wavelength will be emitted by optical filter from the other side, small Do not pass through in the light of cutoff wavelength, finally realizes that adjustable long wave passes through type optical filter.

The present invention realizes a kind of adjustable long wave flow-through optical filter based on graphene, has small power consumption, cutoff wavelength model The features such as adjustable is enclosed, the fields such as optical engineering, optical instrument are can be widely applied to.

Description of the drawings

Fig. 1 is the structural schematic diagram vertical view of optical filter first embodiment of the present invention;

Fig. 2 is the structural schematic diagram front view of optical filter first embodiment of the present invention

Fig. 3 is the layered structure schematic diagram of optical filter first embodiment of the present invention;

Fig. 4 is the structural schematic diagram of optical filter second embodiment of the present invention;

Fig. 5 is the structural schematic diagram of optical filter 3rd embodiment of the present invention;

Fig. 6 is the structural schematic diagram of optical filter fourth embodiment of the present invention.

Specific implementation mode

The present invention is expanded on further with reference to specific embodiment, but the present invention is not limited to following embodiments.It is described Method is conventional method unless otherwise instructed.The raw material can obtain unless otherwise instructed from open commercial sources.

Fig. 1 show the structural representation vertical view vertical view of filter elements first embodiment of the present invention, Fig. 2 For the structural schematic diagram front view of filter elements first embodiment of the present invention, Fig. 3 is filter elements shown in the present invention The layered structure schematic diagram of first embodiment.First, graphene is covered on 1 surface of circular optical window, and in graphite Alkene surface is coated with semi-annular shape metal electrode 1, and metal electrode 2 is coated in region of the optical window surface without graphene.Again in stone Black alkene and 2 surface of metal electrode cover ionic liquid, are finally covered in topmost one layer with circular optical window 2.From metal electricity Pole 1 and metal electrode 2 are connected to voltage source.

As shown in Figs. 1-3, optical filter first embodiment only includes a filter elements.The unit includes dividing up and down Open up the first optical window 1 and the second optical window 2 set, the thickness of the first optical window 1 and the second optical window 2 is generally 0.5 millimeter to 10 millimeters, size can change according to the size of designed optical filter.In shown in Fig. 1-3 One optical window 1 and the second optical window 2 are a circular tunic.Between the first optical window 2 and the second optical window 1 It is disposed with graphene layer, metal electrode layer, ionic liquid.Wherein, ionic liquid can also use ion colloidal sol or gel Instead of metal electrode layer includes the first metal electrode 1 and the second metal electrode 2.Graphene layer is usually 1-10 graphene list Layer, thickness is usually 0.3 nanometer to 3 nanometers, and the thickness of metal electrode layer is usually 0.5 nanometer to 1 millimeter, ionic liquid Thickness is usually 1 nanometer to 1 millimeter.Second optical window 2 includes first part and second part, and graphene layer only covers second The second part of the first part of optical window 2, i.e. the second optical window 2 does not cover graphene layer.For example, can be by the second light The major arc bow for learning window 2 is used as first part, regard the minor arc bow of the second optical window 2 as second part, over the first portion It covers graphene layer and does not cover graphene layer on the second portion.It is provided with first on the corresponding graphene layer of first part Metal electrode 1, is provided with the second metal electrode 2 on the second portion, and the first metal electrode 1 and the second metal electrode 2 are electrically not Conducting.The mode that annulus may be used in first metal electrode 1 is circumferentially disposed along the periphery of graphene, and the second metal electrode 2 can It is arranged in the form of using minor arc similar with second part bow, and the first metal electrode 1 is in contact with graphene layer, and the Two metal electrodes 2 are not contacted with graphene layer.A cavity is formed between metal electrode layer and the first optical window, in metal electricity Ionic liquid is set on the layer of pole, and ionic liquid is full of above-mentioned cavity.It is circumferentially additionally provided with shell (not shown), institute in said units Stating shell can enable ionic liquid to be maintained in the unit, and shell should make optical window to the maximum extent not by It blocks so that light and filtered light before transition are not blocked by shell.In use, in the first metal electrode 1 and the second gold medal The position of filter cut-off wavelength can be then adjusted between category electrode 2 plus voltage.

Optical filter second embodiment includes multiple filter elements and multiple filter elements is connected in series, such as Fig. 4 institutes Show.Each filter elements include complete structure, that is, include the second optical window 2, graphene layer, the metal stacked gradually Electrode layer, ionic liquid layer and the first optical window 2.Multiple filter elements are laminated in the vertical direction, wherein each filter The first metal electrode 1, the graphene layer of light device unit are at same location in the stacking direction, and the of each filter elements Two metal electrodes 2 are similarly positioned in identical position in the stacking direction.First metal electrode 1 of multiple filter elements is electrically connected It connects, the second metal electrode 2 of multiple filter elements is electrically connected.

Optical filter 3rd embodiment includes multiple filter elements and multiple filter elements is connected in series, such as Fig. 5 institutes Show.Multiple filter elements are laminated in the vertical direction, two neighboring filter elements share optical window, i.e., adjacent layer The second optical window 2 in filter elements above and the first optical window in following filter elements on folded direction Mouth 1 is actually the same optical window.First metal electrode 1 of each filter elements, graphene layer are in the stacking direction At same location, the second metal electrode 2 of each filter elements is similarly positioned in identical position in the stacking direction.It is more First metal electrode 1 of a filter elements is electrically connected, and the second metal electrode 2 of multiple filter elements is electrically connected.

Optical filter fourth embodiment includes multiple filter elements and multiple filter elements is connected in series, such as Fig. 6 institutes Show.Multiple filter elements are laminated in the vertical direction, two neighboring filter elements share optical window, i.e., adjacent layer The second optical window 2 in filter elements above and the first optical window in following filter elements on folded direction Mouth 1 is actually the same optical window.It is also set gradually in the stacking direction between the first optical window 1 and ionic liquid layer There are the second metal electrode layer and the second graphene layer.Each the first metal electrode 1, graphene layer of filter elements are in stacking side At same location upwards, the second metal electrode 2 of each filter elements is similarly positioned in identical position in the stacking direction It sets.First metal electrode 1 of multiple filter elements is electrically connected, and the second metal electrode 2 of multiple filter elements is electrically connected It connects.

Light from optical filter side incidence pass through graphene, be more than filter cut-off wavelength light will by optical filter from The other side is emitted, and the light less than cutoff wavelength does not pass through.By changing the size of input voltage value, filter cut-off can be adjusted The position of wavelength.

Optical window main function is carrying graphene.Therefore, optical window shape is not fixed requires, and can be round Shape, rectangle, triangle, the shapes such as irregular figure.

The material of optical window is common commercial optical window, for example, germanium, silicon, quartz, vitreous silica (SiO2)、α-BBO (α-barium metaborate), barium fluoride (BaF2), calcirm-fluoride (CaF2), zinc selenide (ZnSe), F2 (flint glass), calcite (calcium carbonate Or Iceland spar), magnesium fluoride (MgF2), N-BK7 glass (borosilicate crown glass), K9 glass (crown glass), N-SF11 glass (dense flint glass), rutile (TiO2), sapphire (Al2O3), polytetrafluoroethylene (PTFE) (PTFE, Teflon), Yttrium Orthovanadate (YVO4) etc. Material.

Can be mechanical stripping method, solution coating process, chemistry in the method that optical window surface covers graphene film Vapour deposition process, molecular beam epitaxial growth method, the methods of physics Van der Waals force epitaxial growth hair.

Metal electrode 1 and metal electrode 2 mainly play electric action, therefore are required for specific material is not fixed.It can be with It is metal or alloy material, can is Au, can also be such as Pt, Cr, Pb, Ti, Ag, Cu, Al, Fe, Sn, Pb or Cr/Au bis- Tunic (first plate one layer of Cr, then plate layer of Au, following duplicatures are similar), Ti/Au, Pt/Au, Pb/Au duplicature, or lead The conductive materials such as electric elargol.

1 main function of metal electrode be electricity conducting graphene, and 2 main function of metal electrode be contact ions liquid simultaneously And it is not turned on graphene, therefore metal electrode 1 and metal electrode 2 are required for specific electrode shape is not fixed.Can be Annular shape, rectangle, triangle, the shapes such as irregular figure.Therefore, metal electrode 2 can directly overlay on optical window 2 Without graphene part, the part graphene on 2 surface of optical window can also be covered in, but the part graphene not with first part 1 electric communication of graphene and metal electrode.

The preparation method of above-mentioned optical filter is further described below.

Method 1.

The method for preparing the adjustable long wave flow-through optical filter based on graphene includes the following steps:

1) chemical vapour deposition technique is used to grow 1~10 layer of graphene on vitreous silica surface.

2) graphene surface described in step 1) and quartz substrate plating metal on surface Au electrodes 1 and metal Au electrodes 2 with And lead;Metal Au electrodes 1 and 2 electricity of metal Au electrodes is required to be not turned on simultaneously.

3) the surface covering ionic liquid of the metal Au electrodes 2 described in the step 1) graphene and step 2) is (double (bis- (trifyl) the acid imide root salting liquids of N, N- diethyl-N- methyl-N- (2- methoxyethyls) ammonium, write a Chinese character in simplified form [DEME] [TFSI])。

4) the ionic liquid surface described in step 3) is covered with vitreous silica, forms two pieces of vitreous silica pieces and is clipped in graphite The structure of the both sides of the structure of alkene, metal electrode and ionic liquid.

5) step 2) the metal Au electrodes 1 are grounded, and two metal Au electrodes is connected to voltage source, obtained described Adjustable long wave flow-through filter elements based on graphene, as shown in Figure 1, Figure 2 and Figure 3.

6) finally by multiple steps 5) filter elements optical filter in series, as shown in Figure 4.

7) light passes through graphene from optical filter side incidence described in step 6), and the light more than filter cut-off wavelength will pass through Optical filter is emitted from the other side, and the light less than cutoff wavelength does not pass through.The voltage swing inputted by voltage source, can adjust filter The position of light device cutoff wavelength.The filter can be applied in light path, unwanted short wavelength's light wave be filtered out, through needs Long wavelength's light wave.

Method 2.

The method for preparing the adjustable long wave flow-through optical filter based on graphene includes the following steps:

1) solution coating process is used to coat 1~10 layer of graphene on vitreous silica surface.

2) graphene surface described in step 1) and quartz substrate surface make metal Au electrodes 1 and metal Au electrodes 2 And lead;Metal Ag electrodes 1 and 2 electricity of metal Ag electrodes is required to be not turned on simultaneously.

3) surface of the metal Ag electrodes 2 described in the step 1) graphene and step 2) covers ionic liquid gel (hexafluorophosphoric acid 1- butyl -2,3- methylimidazoles salting liquid (writing a Chinese character in simplified form [BMMIM] [TFSI]) is mixed with polyethylene oxide (PEO) Ion liquid sol or gel made of reaction), the endless integer structural unit of the filter is made in this way.

2) and 3) 4) according to step 1), the method makes the endless integer structural unit described in multiple steps 3).

5) in electrical communication by all metal Au electrodes of multiple imperfect structures units described in step 4) 1, all metal Au Electrode 2 in electrical communication, and is connected to voltage source, the adjustable long wave flow-through optical filter based on graphene is obtained, such as Fig. 5 institutes Show.

6) light passes through graphene from optical filter side incidence described in step 5), and the light more than filter cut-off wavelength will pass through Optical filter is emitted from the other side, and the light less than cutoff wavelength does not pass through.The voltage swing inputted by voltage source, can adjust filter The position of light device cutoff wavelength.The filter can be applied in light path, unwanted short wavelength's light wave be filtered out, through needs Long wavelength's light wave.

Method 3.

The method for preparing the adjustable long wave flow-through optical filter based on graphene includes the following steps:

1) it obtains 1~10 layer of graphene film with mechanical stripping method and is transferred to vitreous silica upper and lower surface.

2) graphene surface described in step 1) and quartz substrate upper and lower surface plating metal Au electrodes 1 and metal Au electricity Pole 2 and lead;Metal Au electrodes 1 and 2 electricity of metal Au electrodes is required to be not turned on simultaneously.As shown in Figure 3 and Figure 6.

3) surface of the metal Au electrodes 2 described in the step 1) graphene and step 2) covers ionic liquid gel (hexafluorophosphoric acid 1- butyl -2,3- methylimidazoles salting liquid (writing a Chinese character in simplified form [BMMIM] [TFSI]) is mixed with polyethylene oxide (PEO) Ionic liquid gel made of reaction), the endless integer structural unit of the filter is made in this way.

2) and 3) 4) according to step 1), the method makes the endless integer structural unit described in multiple steps 3).

5) in electrical communication by all metal Au electrodes of multiple imperfect structures units described in step 4) 1, all metal Au Electrode 2 in electrical communication, and is connected to voltage source, the adjustable long wave flow-through optical filter based on graphene is obtained, such as Fig. 6 institutes Show.

6) light passes through graphene from optical filter side incidence described in step 5), and the light more than filter cut-off wavelength will pass through Optical filter is emitted from the other side, and the light less than cutoff wavelength does not pass through.The voltage swing inputted by voltage source, can adjust filter The position of light device cutoff wavelength.The filter can be applied in light path, unwanted short wavelength's light wave be filtered out, through needs Long wavelength's light wave.

It should be noted that, although side of the embodiment to adjustable long wave flow-through filter elements of the preparation based on graphene Method has made exemplary explanation, but wherein electrode is metal, multiple layer metal or alloy material, can be Au, can also be example As Pt, Ag, Cu, Al, Fe or Cr/Au duplicature (first plate one layer of Cr, then plate layer of Au, following duplicatures are similar), Ti/Au, Pt/Au, Pb/Au duplicature or conductive silver glue.Preferably, the material of electrode be Au, Ag, Cu, Al, Fe, Gr, Ti, Pb, Sn, Cr/Au, Ti/Au, Pt/Au or Pb/Au and its alloy or conductive silver paint.

Wherein optical window can be germanium, silicon, quartz, vitreous silica (SiO2), α-BBO (α-barium metaborate), barium fluoride (BaF2), calcirm-fluoride (CaF2), zinc selenide (ZnSe), F2 (flint glass), calcite (calcium carbonate or Iceland spar), magnesium fluoride (MgF2), N-BK7 glass (borosilicate crown glass), K9 glass (crown glass), N-SF11 glass (dense flint glass), rutile (TiO2), sapphire (Al2O3), polytetrafluoroethylene (PTFE) (PTFE, Teflon), Yttrium Orthovanadate (YVO4) etc. one or more.

The form of ionic liquid used is a variety of.Can be following one or more:Phosphate buffered saline solution (is write a Chinese character in simplified form PBS, main component are Na2HPO4、KH2PO4, NaCl and KCl);Two (trimethyl fluoride sulfonyl) lithiums (Li-TFSI);Potassium hyperchlorate (KClO4);Lithium perchlorate (LiClO4);

Can be the ionic liquid being combined by following anions and canons, cation or anion are one or more of:

Cationic (writing a Chinese character in simplified form-English name-Chinese):

AAIM 1,3-diallylimidazolium 1,3- diallyl glyoxaline cations

AEIM 1-allyl-3-ethylimidazolium 1- allyl -3- ethylimidazolium cations

BMIM 1-butyl-3-methylimidazolium 1- butyl -3- methyl imidazolium cations

BMMIM 1-butyl-2,3-dimethylimidazolium 1- butyl -2,3- dimethyl imidazolium cations

DEME N, N-diethyl-N-methyl (2-methoxyethyl) ammonium N, N- diethyl-N- methyl

- N- (2- methoxyethyls) ammonium cation

EMIM 1-ethyl-3-methylimidazolium 1- ethyl-3-methylimidazole cations

EMMIM 1-ethyl-2,3-dimethylimidazolium 1- ethyl -2,3- dimethyl imidazolium cations

HMIM 1-hexyl-3-methylimidazolium 1- hexyl -3- methyl imidazolium cations

OMIM 1-octyl-3-methylimidazolium 1- octyl -3- methyl imidazolium cations

PP13 (MPPR) N-methyl-N-propylpiperidinium N- Methyl-N-propyl piperidines alkane cation

P13 N-methyl-N-propylpyrrolidinium N- Methyl-N-propyls pyrrolidines cation

P14 N-butyl-N-methylpyrrolidinium 1- butyl -1- crassitude cations

TMPA (TPA) N, N, N-trimethyl-N-propylammonium N, N, N- trimethyl-N- propyl ammonium salt cations

Anion (writes a Chinese character in simplified form-English name-Chinese):

Bis- (five fluorine ethylsulfonyls) the acid imide roots of BETI bis (pentafluoroethanesulfonyl) imide

BF4 tetrafluoroborate tetrafluoroborates

DCA dicyanamide cdicynanmide roots

FAP tris (pentafluoroethyl) trifluorophosphate tri- (pentafluoroethane base) trifluoro phosphate radical

Bis- (fluorosulfonyl) the acid imide roots of FSI bis (fluorosulfonyl) imide

OctOSO3 n-octylsulfate n- octyl sulfates

OTf trifluoromethanesulfonate trifluoromethanesulfonic acid roots

PF6 hexafluorophosphate hexafluoro-phosphate radicals

Tetra- cyanogen borates of TCB tetracyanoborate

Bis- (trifyl) the acid imide roots of TFSI bis (trifluoromethylsulfonyl) imide.

The ionic liquid can also be ionic liquid gel made of the following polymer solvent of mixing:Polyethylene oxide (Poly (ethylene oxide), abbreviation PEO), triblock polymer [PS-PMMA-PS], triblock polymer [PS-PEO- PS] (wherein P indicates that polymer, S indicate styrene, and PMMA is polymethyl methacrylate, and PEO is polyethylene oxide).

The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, Any one skilled in the art in the technical scope disclosed by the present invention, the variations and alternatives that can be readily occurred in, Should all it cover within the scope of the present invention.

Claims (10)

1. a kind of optical filter based on graphene, which is characterized in that the optical filter includes one or more filter elements, institute It includes the second optical window, graphene layer, metal electrode layer, the ionic liquid stacked gradually in the stacking direction to state filter elements Layer and the first optical window.
2. optical filter as described in claim 1, which is characterized in that the second optical window includes first part and second part, Graphene layer only covers the first part of the second optical window, and the second part of the second optical window does not cover graphene, wherein Graphene layer includes 1-10 graphene single layer;Preferably, the major arc of the second optical window bow is regard as first part, by the The minor arc bow of two optical windows is used as second part, covers graphene layer over the first portion and does not cover stone on the second portion Black alkene.
3. optical filter as claimed in claim 2, which is characterized in that metal electrode layer includes the first metal electrode and the second metal Electrode is provided with the first metal electrode on the corresponding graphene layer of first part, is provided with the second metal on the second portion Electrode, the first metal electrode are not turned on the second metal electrode electricity;Preferably, the first metal electrode uses unsealed circle The mode of ring is circumferentially disposed along the periphery of graphene layer, and the second metal electrode uses the shape of minor arc similar with second part bow Formula is arranged, and the first metal electrode is in contact with graphene layer, and the second metal electrode is not contacted with graphene layer.
4. optical filter as claimed in claim 3, which is characterized in that form one between metal electrode layer and the first optical window Cavity, is arranged ionic liquid on metal electrode layer, and ionic liquid is full of the cavity.
5. optical filter according to any one of claims 1-4, which is characterized in that be provided with multiple optical filters in the stacking direction Unit, wherein the first metal electrode, the graphene layer of each filter elements are at same location in the stacking direction, each Second metal electrode of filter elements is similarly positioned in identical position, the first gold medal of multiple filter elements in the stacking direction Belong to electrode and be electrically connected to same point, the second metal electrode of multiple filter elements is electrically connected to same point.
6. optical filter according to any one of claims 1-4, which is characterized in that be provided with multiple optical filters in the stacking direction Unit, two neighboring filter elements share optical window, i.e., are in filter elements above on adjacent stacking direction Second optical window and the first optical window in following filter elements are actually the same optical window;Each filter The first metal electrode, the graphene layer of light device unit are at same location in the stacking direction, and the of each filter elements Two metal electrodes are similarly positioned in identical position in the stacking direction, and the first metal electrode of multiple filter elements is electrically connected To same point, the second metal electrode of multiple filter elements is electrically connected to same point.
7. optical filter as claimed in claim 6, which is characterized in that in the ionic liquid layer and the first light of each filter elements It is also disposed with the second metal electrode layer and the second graphene layer in the stacking direction between window.
8. optical filter according to any one of claims 1-4, which is characterized in that the ionic liquid layer be ionic liquid or from Sub- gel;
The ionic liquid is the one or more of following solution:Phosphate buffered saline solution (writes a Chinese character in simplified form PBS, main component is Na2HPO4、KH2PO4, NaCl and KCl);Two (trimethyl fluoride sulfonyl) lithium (Li-TFSI) solution;Potassium hyperchlorate (KClO4) solution; Lithium perchlorate (LiClO4) solution;Or the ionic liquid is the ionic liquid being combined by anions and canons, wherein sun from Attached bag includes one or more below:1,3- diallyl glyoxaline cation, 1- allyl -3- ethylimidazolium cations, 1- fourths Base -3- methyl imidazolium cations, 1- butyl -2,3- dimethyl imidazolium cations, N, N- diethyl-N- methyl-N- (2- methoxy second Base) ammonium cation, 1- ethyl-3-methylimidazole cations, 1- ethyl -2,3- dimethyl imidazolium cations, 1- hexyl -3- first Base glyoxaline cation, 1- octyl -3- methyl imidazolium cations, N- Methyl-N-propyl piperidines alkane cation, N- Methyl-N-propyls Pyrrolidines cation, 1- butyl -1- crassitude cations, N, N, N- trimethyl-N- propyl ammonium salt cations;Anion packet Include one or more below:Bis- (five fluorine ethylsulfonyls) acid imide roots, tetrafluoroborate, cdicynanmide root, three (pentafluoroethanes Base) trifluoro phosphate radical, bis- (fluorosulfonyl) acid imide roots, n- octyl sulfates, trifluoromethanesulfonic acid root, hexafluoro-phosphate radical, four cyanogen Borate, bis- (trifyl) acid imide roots;
Ionic gel is two or more the manufactured ionic gels for mixing following polymer:Polyethylene oxide (Poly (ethylene oxide), abbreviation PEO), triblock polymer [PS-PMMA-PS], triblock polymer [PS-PEO-PS] (its Middle P indicates that polymer, S indicate styrene, and PMMA is polymethyl methacrylate, and PEO is polyethylene oxide).
9. optical filter according to any one of claims 1-4, which is characterized in that optical window is round, rectangle, triangle Or irregular figure;Preferably, the material of optical window is selected from germanium, silicon, quartz, vitreous silica (SiO2), (α-is inclined by α-BBO Barium borate), barium fluoride (BaF2), calcirm-fluoride (CaF2), zinc selenide (ZnSe), F2 (flint glass), calcite (calcium carbonate or Iceland spar), magnesium fluoride (MgF2), N-BK7 glass (borosilicate crown glass), K9 glass (crown glass), N-SF11 glass (weight fire Stone glass), rutile (TiO2), sapphire (Al2O3), polytetrafluoroethylene (PTFE) (PTFE, Teflon), Yttrium Orthovanadate (YVO4) etc. one kind Or it is a variety of.
10. a kind of method preparing the adjustable long wave flow-through filter elements based on graphene, which is characterized in that the optical filtering Device includes one or more filter elements, and the filter elements include the second optical window stacked gradually in the stacking direction Mouth, graphene layer, metal electrode layer, ionic liquid layer and the first optical window, wherein the metal electrode layer includes the first gold medal Belong to electrode and the second metal electrode, the method include the following steps:
1) graphene layer is covered in the second optical window upper surface;
2) the first metal electrode and lead are made on the graphene layer of gained;
3) the second metal electrode and lead are made on the optical window surface;
4) ionic liquid layer is covered in the graphene layer and metal electrode layer surface;
5) the first optical window is covered in ionic liquid layer;
6) first metal electrode is grounded, and voltage source the two poles of the earth is respectively connected to the second metal electrode, obtained described Adjustable long wave flow-through filter elements based on graphene.
CN201810057823.6A 2018-01-22 2018-01-22 Adjustable long-wave-pass filter based on graphene CN108363221B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810057823.6A CN108363221B (en) 2018-01-22 2018-01-22 Adjustable long-wave-pass filter based on graphene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810057823.6A CN108363221B (en) 2018-01-22 2018-01-22 Adjustable long-wave-pass filter based on graphene

Publications (2)

Publication Number Publication Date
CN108363221A true CN108363221A (en) 2018-08-03
CN108363221B CN108363221B (en) 2020-04-03

Family

ID=63006551

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810057823.6A CN108363221B (en) 2018-01-22 2018-01-22 Adjustable long-wave-pass filter based on graphene

Country Status (1)

Country Link
CN (1) CN108363221B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101774574A (en) * 2010-01-22 2010-07-14 湘潭大学 Preparation method of graphene inorganic nanocomposite
CN103779107A (en) * 2012-10-25 2014-05-07 海洋王照明科技股份有限公司 Graphene and ionic liquid composite material, preparation method thereof and electrochemical capacitor
CN105700201A (en) * 2016-01-30 2016-06-22 中南林业科技大学 Optical filter based on graphene
CN106024901A (en) * 2016-07-22 2016-10-12 中国科学技术大学先进技术研究院 Method for regulating and controlling material carrier concentration, field effect transistor and manufacturing method
US9741796B2 (en) * 2015-09-20 2017-08-22 National Tsing Hua University Graphene-based valley filter and method for operating the same
CN107482072A (en) * 2016-06-07 2017-12-15 香港大学 Graphene-based wavelength selective optical detector with sub-bandgap detectivity

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101774574A (en) * 2010-01-22 2010-07-14 湘潭大学 Preparation method of graphene inorganic nanocomposite
CN103779107A (en) * 2012-10-25 2014-05-07 海洋王照明科技股份有限公司 Graphene and ionic liquid composite material, preparation method thereof and electrochemical capacitor
US9741796B2 (en) * 2015-09-20 2017-08-22 National Tsing Hua University Graphene-based valley filter and method for operating the same
CN105700201A (en) * 2016-01-30 2016-06-22 中南林业科技大学 Optical filter based on graphene
CN107482072A (en) * 2016-06-07 2017-12-15 香港大学 Graphene-based wavelength selective optical detector with sub-bandgap detectivity
CN106024901A (en) * 2016-07-22 2016-10-12 中国科学技术大学先进技术研究院 Method for regulating and controlling material carrier concentration, field effect transistor and manufacturing method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHANG-HUA LIU ETC.: "Graphene photodetectors with ultra-broadband and high responsivity at room temperature", 《NATURE NANOTECHNOLOGY》 *

Also Published As

Publication number Publication date
CN108363221B (en) 2020-04-03

Similar Documents

Publication Publication Date Title
US10591797B2 (en) Electrochromic devices
US10001689B2 (en) Electrochromic multi-layer devices with composite electrically conductive layers
AU2017202249B9 (en) Electrochromic devices
Shin et al. High-performance flexible perovskite solar cells exploiting Zn 2 SnO 4 prepared in solution below 100 C
Grancini et al. One-Year stable perovskite solar cells by 2D/3D interface engineering
Zheng et al. Flexible, transparent and ultra-broadband photodetector based on large-area WSe2 film for wearable devices
Sadhanala et al. Preparation of single-phase films of CH3NH3Pb (I1–x Br x) 3 with sharp optical band edges
US10437128B2 (en) Electrochromic multi-layer devices with spatially coordinated switching
Ke et al. Emerging thermal‐responsive materials and integrated techniques targeting the energy‐efficient smart window application
Jain et al. Vapor phase conversion of PbI 2 to CH 3 NH 3 PbI 3: spectroscopic evidence for formation of an intermediate phase
Mortimer et al. Electrochromic materials and devices
US20180252977A1 (en) Electrochromic multi-layer devices with current modulating structure
US10078252B2 (en) Electrochromic multi-layer devices with composite current modulating structure
Pellet et al. Transforming hybrid organic inorganic perovskites by rapid halide exchange
US10514581B2 (en) Electrochromic nickel oxide simultaneously doped with lithium and a metal dopant
Liu et al. CVD-grown MoSe2 with high modulation depth for ultrafast mode-locked erbium-doped fiber laser
Gesheva et al. Optical properties of chemical vapor deposited thin films of molybdenum and tungsten based metal oxides
Llordés et al. Tunable near-infrared and visible-light transmittance in nanocrystal-in-glass composites
US8300298B2 (en) Electrochromic devices
US8764951B2 (en) Electrochromic devices
Wu et al. Transparent, conductive carbon nanotube films
US6755993B2 (en) Electrochromic system
Gondoni et al. Structure-dependent optical and electrical transport properties of nanostructured Al-doped ZnO
Wang et al. All‐inorganic metal halide perovskite nanostructures: from photophysics to light‐emitting applications
Bange Colouration of tungsten oxide films: a model for optically active coatings

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant