CN207675641U - Index sensor based on graphene heptamer method promise resonance - Google Patents
Index sensor based on graphene heptamer method promise resonance Download PDFInfo
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Abstract
Index sensor disclosed by the utility model based on graphene heptamer method promise resonance, including a y-type optical fiber circulator, there are three ports, respectively input terminal, sensor ends and output end for tool；And the graphene heptamer that is arranged on the silica surface of the aforementioned sensor ends, the graphene heptamer can generate the method promise resonance of high-quality.The index sensor based on graphene heptamer method promise resonance of the utility model is compact-sized, and method promise can be resonated and be used for actual refractive index sensing device, and have high sensitivity, method promise resonance is up to 1720nm/RIU with the variation of refractive index.
Description
Technical field
The utility model belongs to application of the phasmon (plasmonics) in sensory field, refers in particular to a kind of based on graphite
The index sensor of alkene heptamer method promise resonance.
Background technology
In recent years, as micro Process and chemical preparation techniques constantly improve, phasmon optics has obtained swift and violent hair
Exhibition.Surface phasmon can make to converge in the electric field that the electric field strength around nanostructure is much larger than incident light, to make electromagnetism
Field energy is bound in the nanostructure more much smaller than optical wavelength, breaches diffraction limit.Based on this characteristic, surface etc. from
Excimer has a wide range of applications potentiality in the sensory fields such as chemistry, biology, optics.
Method promise resonance is a kind of unique phenomena based on nanostructured surface plasmon resonance.Method promise resonance generation be
Due to the interaction between the bright pattern of wideband superradiance and the narrow dark pattern of frequency Low emissivity result (J.A.Fan, C.Wu,
K.Bao,J.Bao,R.Bardhan,N.J.Halas,V.N.Manoharan,P.Nordlander,G.Shvets,and
F.Capasso.Self-AssembledPlasmonicNanoparticle Clusters[J].Science,2010,328
(5982):1135-8).Method promise resonance can generate in metal multimeric structure, while to the variation of ambient enviroment refractive index
With high susceptibility.According to this characteristic, the method promise resonance based on metal Nano structure has been received applied to high sensitivity
Rice index sensor field (J.A.Fan, K.Bao, C.Wu, J.Bao, R.Bardhan, N.J.Halas,
V.N.Manoharan,G.Shvets,P.Nordlander,and F.Capasso.Fano-Like Interference in
Self-Assembled Plasmonic Quadrumer Clusters[J].Nano Lett,2010,10(11):4680-5)。
However the shortcomings of ohmic loss of metal Nano structure is too big and unadjustable property, hinders method promise and resonates linear optimization, it is high
Sensitivity is also restricted.In addition, based on method promise resonance high sensor many places in theoretical research stage, at present simultaneously
There is no the structure of specific application apparatus to realize highly sensitive refractive index sensing.
Therefore, the present inventor using graphene heptamer and y-type optical fiber circulator construct one it is feasible be based on method promise
The index sensor of resonance.
Utility model content
The technical purpose of the utility model is to propose a kind of refractive index sensing to resonate based on graphene heptamer method promise
Device, the index sensor have the function of highly sensitive sensing to the variation of extraneous ambient refractive index.
In order to solve the above-mentioned technical problem, the technical solution of the utility model is as follows：
Based on the index sensor of graphene heptamer method promise resonance, including：
One y-type optical fiber circulator, there are three ports, respectively input terminal, sensor ends and output end for tool；And
One is arranged the graphene heptamer on the silica surface of the aforementioned sensor ends, the graphene heptamer
The method promise resonance of high-quality can be generated.
Preferably, foregoing graphites alkene heptamer is centered around by a center nanometer plate and six around the nanometer plate of center
Edge nanometer plate composition, six edges nanometer plate equidistantly distributed, and the center nanometer plate radius is 70nm, edge is received
The radius of rice disk is 50nm, and the spacing of edge nanometer plate and the center nanometer plate is 10nm.
Further, the nanometer disc thickness of all preceding speed is 0.334nm.
Further, the chemical potential of preceding edge nanometer plate is 0.5eV, and the chemical potential of center nanometer plate is 0.55eV.
The method for making the above-mentioned index sensor to be resonated based on graphene heptamer method promise, is included the following steps：
Step 1: preparing graphene heptamer
According to the photoelectric characteristic of phasmon and grapheme material, the stone for the method promise resonance that can generate high-quality is constructed
Black alkene heptamer structure；
Step 2: sensor is molded
The step 2, it is respectively the y-type optical fiber circulator of input terminal, sensor ends and output end to take three ports, will be walked
Graphene heptamer made from rapid one is put on the silica surface of y-type optical fiber circulator sensor ends；
Step 3: the sensing outcome of analog simulation index sensor
Graphene heptamer made from step 1 is placed on arbitrary silicon dioxide liner bottom surface, is obtained described in step 2
The simulation model of sensor is vertically injected light from the silicon dioxide substrates below graphene heptamer, phantom
The extinction spectra for being in varying environment obtains sensitivity level of the sensor as aforementioned to extraneous variations in refractive index.
The step 1 is specially：By calculating the extinction spectra of graphene-structured, adjusts center nanometer plate and edge is received
Radius, thickness and the chemical potential of rice disk, and determine the spacing of edge nanometer plate and center nanometer plate, to obtain high-quality
Method promise is resonated；
After calculating, grapheme material is taken to build a center according to radius above-mentioned, thickness, chemical potential and spacing parameter
Graphene heptamer is made in nanometer plate and the edge nanometer plate being centered around around the nanometer plate of center.
The extinction spectra calculates：
Extinction Cross σextCalculating, formula σext=σsc+σabsWherein σscFor scattering section, σabsFor absorption cross-section, σsc
Calculation formula be：
Wherein I0For incident intensity,Normal vector outside for direction,For the scattering strength of electromagnetic energy intensity, in graphite
Alkene is integrated close to surface, σabsCalculation formula be：
Wherein I0For incident intensity, P is power attenuation intensity, is integrated in the space close to graphene-structured.
Compared with prior art, the utility model has the beneficial effect that：The utility model is compact-sized, and method promise can be resonated
For actual refractive index sensing device, and there is high sensitivity, method promise resonance is up to the variation of refractive index
1720nm/RIU。
The technical solution of the utility model is described in detail with reference to the accompanying drawings and detailed description.
Description of the drawings
Fig. 1 is the utility model graphene heptamer structure chart；
Fig. 2 is the utility model y-type optical fiber circulator schematic diagram；
Fig. 3 is the index sensor schematic diagram that the utility model is resonated based on graphene heptamer method promise；
Fig. 4 is the simulation model schematic diagram of the utility model；
Fig. 5 is simulation result diagram of the extinction spectra with variations in refractive index；
Fig. 6 is the result of calculation figure of the utility model sensor refractive index sensitivity.
Specific implementation mode
As shown in Figs. 1-3, the index sensor based on graphene heptamer method promise resonance that the utility model discloses, packet
It includes：
One y-type optical fiber circulator 1, as shown in Fig. 2, its tool is there are three port, respectively input terminal 11, sensor ends 12 and defeated
Outlet 13；And
One is arranged the graphene heptamer 2 on the silica surface of the aforementioned sensor ends, and the graphene seven is poly-
Body 2 can generate the method promise resonance of high-quality, and the calculation formula of the quality factor q of method promise resonance is Q=f0/ δ f, wherein f0For method promise
The position that low ebb occurs, δ f are the full width at half maximum (FWHM) of method promise resonance.Due to the asymmetry of method promise resonance, δ f are usually with total from method promise
Shake low ebb between high-frequency peak value difference on the frequency indicate, designed graphene heptamer structure generate method promise resonance quality
The factor can reach 165 in air environment.As shown in Figure 1, the graphene heptamer 2 specifically by a center nanometer plate 21 and
Six edge nanometer plates 22 being centered around around the nanometer plate of center form, six edge nanometer plates, 22 equidistantly distributed, and
21 radius R of the center nanometer plate2For 70nm, the radius R of edge nanometer plate 221For 50nm, edge nanometer plate 22 and the center
The spacing of nanometer plate 21 is 10nm.
Further, the nanometer disc thickness of all preceding speed is 0.334nm.
Further, the chemical potential μ of preceding edge nanometer plate 22c1For 0.5eV, the chemical potential μ of center nanometer plate 21c2For
0.55eV, the utility model are not defined in this to the chemical potential of center nanometer plate 21 and edge nanometer plate 22, and graphene seven is poly-
Method promise resonance caused by body 2 has high-quality, but it can be carried out further by changing the chemical potential of graphene nano disk
It adjusts.
The utility model further discloses the side for making the above-mentioned index sensor to resonate based on graphene heptamer method promise
Method includes the following steps：
Step 1: preparing graphene heptamer
According to the photoelectric characteristic of phasmon and grapheme material, the stone for the method promise resonance that can generate high-quality is constructed
Black alkene heptamer structure；With the property according to phasmon molecule, when the dipole that center nanometer plate 21 and edge nanometer plate 22 are supported
When oscillation can cancel out each other, apparent method promise covibration could occur, it, can be by changing graphite according to the characteristic of graphene
To change its electromagnetic property, therefore in this example, graphene heptamer building process is specially the chemical potential of alkene：By calculating stone
The extinction spectra of black alkene structure determines radius (R1=50nm, R2=70nm), the thickness of center nanometer plate 21 and edge nanometer plate 22
(0.334nm) and chemical potential (μ c1=0.5eV, μ c2=0.55eV) are spent, and determines edge nanometer plate 22 and center nanometer plate
21 spacing (L=10nm)；
Extinction spectra calculates：
Extinction Cross σextCalculating, formula σext=σsc+σabs, wherein σscFor scattering section, σabsFor absorption cross-section,
σscCalculation formula be：
Wherein I0For incident intensity,Normal vector outside for direction,For the scattering strength of electromagnetic energy intensity, in graphite
Alkene is integrated close to surface, σabsCalculation formula be：
Wherein I0For incident intensity, P is power attenuation intensity, is integrated in the space close to graphene-structured；
Grapheme material is taken, 21 and of a center nanometer plate is built according to radius above-mentioned, thickness, chemical potential and spacing parameter
Graphene heptamer 2 is made in the edge nanometer plate 22 being centered around around center nanometer plate 21；Graphene heptamer 2 has D6h pairs
Claim structure, the graphene heptamer structure of design as shown in Figure 1.This structure can be used for the system at highly sensitive refractive index sensing end
Make；
Step 2: sensor is molded
The step 2, it is respectively the y-type optical fiber circulator of input terminal, sensor ends and output end to take three ports, will be walked
Graphene heptamer made from rapid one is put on the silica surface of y-type optical fiber circulator sensor ends；Ensureing graphene
In the case that heptamer can be prepared completely at fiber port, y-type optical fiber circulator is selected according to the actual conditions of working environment
Fiber dimensions；
The operation principle of y-type optical fiber circulator is Faraday polarization apparatus, and optical fiber circulator supports bidirectional port, and allows
The transmitting and reception of a piece enterprising traveling optical signal of optical fiber.Due to the light-transfer characteristic of y-type optical fiber circulator, y-type optical fiber circulator
In fields such as DWDM networks, polarization mode dispersion, dispersion compensation, optical add/drop multiplexer (OADM), image intensifer and FIBER OPTIC SENSORSs
It has a wide range of applications.The operation principle of y-type optical fiber circulator is defeated as shown in Fig. 2, when input signal is inputted by a port
Exit port can be exported in another particular port.The direction of the signal transmission of y-type optical fiber circulator 2 shown in Fig. 2 is:By 1 end
To 2 ends, by 2 ends to 3 ends, then it is belt by 3 ends to 1 end sequence.Graphene heptamer 2 is prepared in the one of y-type optical fiber circulator 1
On the silica surface of a port, as sensor ends 12, input terminal of other two port respectively as incident light beam strikes
11 and receive data output end 13.Constructed index sensor is as shown in Figure 3.1 port is that 11,2 port of input terminal is
12,3 port of sensor ends is output end 13, and the refractive index of present external environment is n1.The work of above-mentioned index sensor
Principle is：Sensor ends 12 are put into unknown refractive index environment, are inputted in input terminal 11 infrared in 4.8 to 5.3 micron wave lengths
Linearly polarized light, due to the directional transmissions property of y-type optical fiber circulator 1, light can be transferred to sensor ends 12, and 13 meeting of output end
Receive the light for not absorbed and being scattered by graphene heptamer 1.
Step 3: the sensing outcome of analog simulation index sensor
In order to test the sensitivity level of the sensor, this step is tested using simulation model, made from step 1
Graphene heptamer 2 is placed on 3 surface of arbitrary silicon dioxide substrates, obtains the simulation model of sensor described in step 2, will
Light enters from the 3 dolly direct projection of silicon dioxide liner of 2 lower section of graphene heptamer, as shown in figure 4, incident light direction is the directions z, partially
Direction shake for the directions y, to ensure that simulation model is consistent with sensor described in step 2.Phantom is in varying environment
The extinction spectra for being obtains sensor as aforementioned to the sensitivity level of extraneous variations in refractive index, and the results are shown in Figure 5, two peak values
Between minimum value be for by method promise resonance generate method promise low ebb.It can be clearly seen from Fig. 5, when the refractive index of ambient enviroment
When gradually increasing, method promise low ebb position will appear apparent red shift.Due to the high symmetry of graphene heptamer, change incident light
To result of calculation, there is no significant impacts for polarization direction.The refractive index of external environment can be sensed using this property.
The sensitivity of the set external boundary's ambient refractive index variation of flowmeter sensor is as shown in Figure 6.The variation with refractive index of method promise resonance is high
Up to 1720nm/RIU, the overwhelming majority index sensor made of metal to resonate based on method promise has been higher than it.
The above is only the utility model preferred embodiment, not appoints to the technical scope of the utility model
What is limited, therefore any trickle amendment made by the above technical examples according to the technical essence of the present invention, equivalent variations
With modification, it is still within the scope of the technical solutions of the present invention.
Claims (3)
1. the index sensor based on graphene heptamer method promise resonance, which is characterized in that including：
One y-type optical fiber circulator, there are three ports, respectively input terminal, sensor ends and output end for tool；And
One is arranged the graphene heptamer on the silica surface of the aforementioned sensor ends, which can produce
The method promise resonance of raw high-quality.
2. the index sensor as described in claim 1 based on graphene heptamer method promise resonance, it is characterised in that：It is aforementioned
The edge nanometer plate that graphene heptamer is centered around by a center nanometer plate and six around the nanometer plate of center forms, described
Six edge nanometer plate equidistantly distributeds, and the center nanometer plate radius is 70nm, the radius of edge nanometer plate is 50nm, side
The spacing of edge nanometer plate and the center nanometer plate is 10nm.
3. the index sensor as claimed in claim 2 based on graphene heptamer method promise resonance, it is characterised in that：It is all
The nanometer disc thickness of preceding speed is 0.334nm.
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