CN108872157B - A kind of side polishing open ring type PCF-SPR sensor - Google Patents
A kind of side polishing open ring type PCF-SPR sensor Download PDFInfo
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- CN108872157B CN108872157B CN201810360037.3A CN201810360037A CN108872157B CN 108872157 B CN108872157 B CN 108872157B CN 201810360037 A CN201810360037 A CN 201810360037A CN 108872157 B CN108872157 B CN 108872157B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02347—Longitudinal structures arranged to form a regular periodic lattice, e.g. triangular, square, honeycomb unit cell repeated throughout cladding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
- G01N2021/5903—Transmissivity using surface plasmon resonance [SPR], e.g. extraordinary optical transmission [EOT]
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Abstract
The invention discloses a kind of sides to polish open ring type PCF-SPR sensor, and including fibre core and the covering being coated on outside fibre core, fibre core is equipped with the airport arranged along fibre core axis direction with covering decentraction on covering；Airport includes first airport, multiple second airports and multiple third airports, first airport is located at cross section of optic fibre center, the annular N corner structure that second airport is K in the number of plies around the first airport, third airport is symmetrically located at fibre core two sides, replaces the second air hole site；Surface polishing is set in optical fiber side, open loop is equipped on surface polishing；Sensing membrane is coated in open loop, open loop is as sensing passage.For the present invention in such a way that side polishes fiber end face and open loop combines, SPR sensorgram layer, can high amplitude or high wavelength sensitivity detection such as liquid oxygen, liquid CO greatly close to fibre core2, the refractive index such as fluorine-containing type organic be lower than 1.3 substance, and can multichannel sensing, expand the application range of existing PCF-SPR sensor.
Description
Technical field
The present invention relates to biochemistry detections and technical field of optical fiber sensing, polish open ring type more particularly, to a kind of side
PCF-SPR sensor.
Background technique
Surface plasma body resonant vibration (Surface Plasmon Resonance, abbreviation SPR) sensing technology is a kind of advanced
Optical sensing techniques.Propagation is right in the surface phasmon (Surface Plasmon, abbreviation SP) of metal and dielectric interface
The variation of incident light and testing medium refractive index is extremely sensitive, has manufactured a large amount of spr sensors based on this principle.Traditional
Spr sensor such as prism-type is not suitable for the application field based on mobile optically and mechanically component since its is bulky, this
Limitation, which is resulted in, there is the spr sensor based on optical fiber in the 1990s.Usually first strip the packet of ordinary optic fibre
Layer, then plates golden film or silver film on fibre core, main to be interacted using the evanscent field revealed from fibre core and external substance
Realize sensing.In recent years, the appearance of photonic crystal fiber (PCF) provides huge potentiality for novel spr sensor.With
Traditional fiber compares, PCF compact, and flexible design multiplicity has special porous structure and guided mode mechanism, can accommodate sample
Product are present in the airport near fibre core in the form of a gas or liquid for highly sensitive sensing.PCF-SPR sensor energy
The phase matched problem of the spr sensor based on traditional fiber or waveguide is efficiently solved, and compared with fluorescent optical sensor,
There is PCF-SPR sensor more highly sensitive, real-time quick, measured object to be not necessarily to many merits such as mark, can remotely monitor, therefore
It is widely used in the every field such as biotechnology, drug screening, environmental monitoring, food safety.Patent name is a kind of " optical fiber
The patent of surface plasma resonance sensing detection device " (number of patent application 200820212280.2) is to realize that PCF-SPR is passed
The Typical Representative of sensor.From 2006, since Canadian Hassani et al. proposes first PCF-SPR sensor structure, at present
Until have been presented for a variety of novel SPR-PCF sensor structures designs, there is respective design feature and preferable performance to answer
With.Current existing PCF-SPR sensor refractive index measurement range is mostly higher than 1.30, leads to not measure some low-refractions
Substance (film, liquid CO2, low-refraction particulate etc.).In addition, when multichannel spr sensor detects multiple analysis object
It is easy to interfere with each other between adjacency channel, SPR resonance spectrum curve is caused to broaden, while there is also multiple formants, so that real
The signal-to-noise ratio of border system reduces, and there are between parameter the problems such as cross sensitivity.And most of PCF-SPR sensors application aspect not
It is prominent and not very practical.Nowadays, there is an urgent need to design it is a have high sensitivity, anti-interference, integration is good, multichannel survey
Amount, meets the PCF-SPR sensor of flexibility, practicability requirement.
Summary of the invention
In view of the foregoing drawbacks, the present invention provides a kind of side polishing open ring type PCF-SPR sensor, it is intended to solve existing
The not high technical problem of PCF-SPR transducer sensitivity.
In order to solve the above technical problems, the present invention provides a kind of sides to polish open ring type PCF-SPR sensor, comprising:
Fibre core and the covering being coated on outside fibre core, fibre core are equipped on covering along fibre core axis direction with covering decentraction
The airport of arrangement；Airport includes first airport, multiple second airports and multiple third airports, the first air
Hole is located at cross section of optic fibre center, and the second airport is arranged around the first airport in the annular N corner structure that the number of plies is K, the
Three airports replace the second air hole site by being located at fibre core two sides with replacing the second airport positional symmetry；In optical fiber side
Face, which is provided with, to be cut flat with and forms surface polishing after polishing treatment, and open loop is equipped on surface polishing；, sensing is coated in open loop
Film, open loop is as sensing passage.
Preferably, surface polishing is located at close to the side of fibre core.
Preferably, core centre introducing is provided with the 4th airport, and the 4th air bore dia is less than and the second air
Pore diameter size ratio is less than 1.
Preferably, open loop section is rectangle, and open loop size can be determined according to measured matter molecular size.
Preferably, all or part of third airport is coated with sensing membrane, and for being used as another sensing passage, and third is empty
Hole diameter is greater than the second air bore dia.
Preferably, thermo-optical coeffecient is filled in third airport using the capillary phenomenon of liquid or pressuring method higher than optical fiber
The liquid of two orders of magnitude of material thermo-optic coefficients.
Preferably, for being injected with measured matter on a sensing passage, another sensing passage is for being above injected with reference
Substance improves the external interference resistance of sensor.
Preferably, two sensing passages are for injecting measured matter, and sensing membrane is tested according to measured matter in sensing passage
Parameter determines, realizes while measuring measured matter different parameters.
Preferably, sensing membrane is multi-layer film structure.
Preferably, spacing is Λ between each airport, and the first airport and the second airport radius size magnitude range are equal
For 0.4 Λ -0.6 Λ, third airport radius size magnitude range is 0.6 Λ -1.2 Λ, the 4th airport radius size size
Range is 0.1 Λ -0.3 Λ, and open loop depth and width magnitude range is 0.5 Λ -2 Λ.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
1, the present invention is in such a way that the fiber end face of side polishing and open loop combine, and SPR sensorgram layer is in X and Y two
It is only located on direction on open loop face width, greatly close to fibre core position, side polished surface is entirely laid in compared to SPR layer
Upper class sensor, sensor provided by the invention measurement sensitivity under low-refraction are greatly improved.
2, surface polishing and open loop are located at close to the side of fibre core, when light is incident on optical fiber, promote the base excited at fibre core
Mould and the plasmon modes of medium/metal layer excitation are easier to resonate, to obtain measured matter under certain refractive index
Loss changes apparent formant with lambda1-wavelength.
3, the 4th airport is introduced at fibre core, for increasing the sensitivity of low-refraction solution in detection open loop, is realized
High sensitivity sensing.
4, the deposition of metal film can be controlled well by being flat surface using the benefit of rectangle open loop, be removed close to rectangle
The partial air hole of open loop bottom keeps fibre core exposed, and fibre core energy leakage can be promoted sensitive to improve detection into metal layer
Degree.The size of open loop entrance can specifically be designed according to measured object molecular size, and the measured object molecule less than entrance opening dimension can lead to
The automatic penetration channel of entrance is crossed, so that open loop plays a role in filtering.
5, third airport at left and right sides of fibre core is introduced, it can be achieved that multichannel sensing, meets practicability and requirement on flexibility.
Open loop destroys structural symmetry, causes birefringent and destroys original degenerate mode, and the X polarization and Y polarization of basic mode separate, thus
It realizes two-parameter measurement, solves the problems, such as the cross sensitivity of two parameters.
6, by changing the size of open loop coated material, airport arrangement, air pore size and open loop, and then can be with
Realize the detection of the substance lower than 1.3 refractive index, which breaches existing same type of sensor refractive index detection limit and be higher than
1.3 limitation, it is detectable as liquid oxygen (refractive index 1.22), liquid carbon dioxide (refractive index 1.20), fluorinated are organic
The substances such as object (refractive index is lower than 1.3) or low-refraction particulate, and can be realized multichannel sensing, it is expected to be applied to
In the multiple practical applications such as novel thin film research and development, atmospheric humidity and temperature detection, micro- sample detection, atmospheric haze detection, expand
The application range of existing PCF-SPR sensor.
Detailed description of the invention
Technical solution of the present invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the cross-sectional view that side provided by the invention polishes open ring type PCF-SPR sensor；
Fig. 2 is the schematic diagram of experiment detecting system device provided by the invention；
Wherein, 1: fibre core, 2: the first airports, 3: metal film, 4: the second airports, 5: third airport, 6: the four is empty
Stomata, 7: open loop, 8: polished end faces, 9: annular hexagonal structure, 10: wide spectrum light source or near infrared laser, 11: the polarizer, 12:
Transmission fiber, 13: coupler, 14: sensor fibre, 15: spectroanalysis instrument, 16: computer.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The object of the present invention is to provide a kind of high sensitivity, and detectable low-refraction substance meets flexibility, practicability
It is required that side polish open ring type PCF-SPR sensor, it is intended to solve that existing PCF-SPR transducer sensitivity is low, can not visit
Survey low-refraction analyte, it is not very practical the disadvantages of, be expected to be applied to novel thin film research and development, atmospheric humidity and temperature detection,
In the practical applications such as micro- sample detection, atmospheric haze detection.
As shown in Figure 1, optical fiber background material, using quartz, optical fiber includes fibre core 1 and the covering that is coated on outside fibre core, it is fine
Core 1 is the same as covering decentraction.The airport along 1 axial alignment of fibre core is equipped on covering, airport includes the first airport 2, the
Two airports 4, third airport 5；First airport 2 is located at cross section of optic fibre center, and the second airport 4 surrounds the first air
Hole 2 is arranged in the annular N corner structure that the number of plies is K, wherein K, N are the integer greater than 2, and third airport 5 is uniformly and symmetrically distributed
In 1 left and right sides of fibre core, replace the second airport 4；It is provided with and cuts flat with and polishing treatment in the optical fiber side close to fibre core
After form surface polishing, surface polishing center towards fibre core direction be equipped with open loop.In the present embodiment, the second airport 4 encloses
It is arranged around the first airport in the annular hexagonal structure 9 that the number of plies is 4.
During making the optical fiber, using optical fiber Side polishing fiber technology, by fiber end face polishing, it is polished to smooth throwing
Light end face 8, then in end face, centre rubbing down goes out rectangle open loop 7, fixes it with special fiber clamp by the optical fiber of rubbing down
Metal film 3 that a layer thickness is 20-40nm is plated as SPR sensorgram film in rectangle rubbing down area planar using filming equipment afterwards,
Solution channel or other kinds of sensing passage as SPR detection.
The present invention is in such a way that side polishes fiber end face and open loop combines, and using open loop structure, SPR sensorgram layer is in cross
Fibre core is concentrated on on the direction x only open loop bottom width, amplitude sensitivity is measured under low-refraction and is entirely tiled compared to SPR layer
It is greatly improved on the polished surface of side.
In another embodiment of the present invention, open loop is rectangle, and being flat surface using the benefit of rectangle open loop can be very well
Control metal film deposition.The size of open loop entrance can specifically be designed according to measured matter molecular size, be less than entrance ruler
Very little measured matter molecule can play solution filtration by the automatic penetration channel of entrance, open loop, and detection atmosphere may be implemented
Middle low-refraction particulate.
In another embodiment provided by the invention, the sensing membrane that third air hole inwall is coated with a thickness of 30-60nm can
To be coated with sensing membrane in all third airports, or in the third airport of part it is coated with sensing membrane, as the PCF-SPR
Another detection channels of sensor cause birefringent and destroy original degenerate mode, base since open loop destroys structural symmetry
The X polarization and Y polarization of mould separate, to realize two-parameter measurement, solve the problems, such as the cross sensitivity of two parameters.Third air
Hole and the second air pore diameter size ratio are greater than 1, and macropore is more conducive to the filling of coating operation and sensor information, increases practical
Property.
In another embodiment of the present invention, core centre introduces the 4th airport, and the 4th airport and the second airport
Diameter ratio is less than 1, for increasing the sensitivity of low-refraction solution in detection open loop.
As further application scheme, open loop and third airport can handle conduct to it according to different practicability demands
Different types of detection sensing passage.
As the application of the PCF-SPR sensor, using liquid capillary phenomenon or pressuring method by thermo-optical coeffecient compared with
The third air hole path of high liquid injection detection optical fiber chooses thermo-optical coeffecient and is higher than the hot light of fiber optic materials as temperature channel
The liquid of two orders of magnitude of coefficient, the higher liquid of thermo-optical coeffecient can be chloroform, the mixing liquid of ethyl alcohol and chloroform or different
Propyl alcohol.
As the application of the PCF-SPR sensor, sensing membrane is multi-layer film structure, and sensing membrane includes metal film and is coated on
Other materials on metal film, such as graphene, MoS2Equal materials are, it can be achieved that bio-sensing, atmospheric humidity sensing.
As the application of the PCF-SPR sensor, the present invention can realize the multi-pass of the sensor using following technical scheme
Road multi-parameter parallel measurement.When detecting the multiple parameters of same sample, only need to fill in different detection channels respectively
The sensing material of same sample, each detection channels is chosen according to different measurement parameters.
As the application of the PCF-SPR sensor, the present invention can be realized self-reference function, to eliminate various environmental factors
Influence, including in noise of instrument, temperature, sample remaining molecule to target molecule interference etc..One of channel need to only be selected
Make detection channels filling sample, another is used as reference channel.Had by the way of measuring the difference of resonant wavelength in two channels
Effect offsets such environmental effects.
In embodiment provided by the invention, spacing is Λ between airport, and the first airport, the second airport radius size are big
Small range is 0.4 Λ -0.6 Λ, and third airport radius size magnitude range is 0.6 Λ -1.2 Λ, the 4th airport radius ruler
Very little magnitude range is 0.1 Λ -0.3 Λ, and open loop depth and width magnitude range is 0.5 Λ -2 Λ.SPR sensorgram layer is in the lateral side X
To being only located on open loop bottom width, greatly close to fibre core, by adjusting open loop size, the arrangement of each airport and ruler
It is very little, and suitable SPR sensorgram layer material is selected, so that can measure ranges of indices of refraction to the movement of low-refraction direction, detection
Refractive index value reaches 1.3 or less.
Using the two-parameter measurement of sample as specific embodiment.As shown in Fig. 2, the present invention is online using being modulated based on wavelength
Conveying type working method carrys out the spr signal of test sample, and spr signal is appeared on transmission spectrum in the form of absorption peak.Detection dress
It sets including wide spectrum light source 10, the polarizer 11, transmission fiber 12, coupler 13, sensor fibre 14, spectroanalysis instrument 15 and computer
16。
To detect in atmosphere for two parameters of particulate refractive index and atmospheric temperature, according to the aerosol to be measured
Solution example molecular diameter size designs sensor fibre open loop openings of sizes, will using the capillary phenomenon or pressuring method of liquid
Chloroform injects channel of the third air hole path of detection optical fiber as measurement atmospheric temperature.Aerosol solution sample is directly fallen
On the side surface polishing of sensor fibre, open loop plays a role in filtering at this time, and the target molecule less than open loop entrance opening dimension can
Directly by the automatic penetration channel of entrance, macromolecular will be blocked in outside open loop.Sensor fibre sample fill after, adjust its
Position on D translation platform makes it keep horizontality and coaxial with optical coupling system.
The incident light issued from wide spectrum light source or near infrared laser enters transmission fiber transmission, is adjusted to through polarizer
Linearly polarized light keeps its polarization direction parallel with the symmetry axis of sensor fibre fibre core, and control coupling condition makes wide spectrum light source or close
The light that infrared laser issues most efficiently is coupled into the fibre core of sensor fibre, has the basic mode of detection optical fiber maximum
Launching efficiency.Incident light enters spectroanalysis instrument by coupler after sample is modulated in sensitive zones, and resonance spectrum is to transmit
The form of absorption peak is embodied on spectroanalysis instrument, and when the parameter of sample changes, the transmission absorption peak is also therewith
It drifts about, spectrometer accesses computer by USB port, and computer is recorded and saved to spectroscopic data.Each target
The variation of parameter is finally presented as that sample equivalent refractive index changes, and passes through two sides of X polarization and Y polarization respectively to basic mode
Measurement to resonant wavelength drift situation, and then realize to the refractive index of sample and the real-time online measuring of temperature biparameter
With monitoring.
Sensor sample rectangle open loop provided by the invention, rectangle open loop bottom flat can be grasped in bottom with uniform coated
Make simple and safety.If target parameter is atmospheric humidity, applied again using coating technique in the flat layer on surface of metal in open loop channel
Apply one or more layers MoS2Two-dimensional material, due to MoS2Surface does not have dangling bonds, has physisorption to hydrone, therefore can
The variable quantity of atmospheric humidity is obtained by detection molybdenum disulfide variations in refractive index, a kind of humidity sensor is made.According to stone
Black alkene plated film, since the high electron density of the hexagonal rings of graphene can stop oxygen, helium atom etc. to pass through its ring structure, high table
Face and volume ratio make it suitable for large area Adsorption for Biomolecules, to can prevent the oxidation of metal surface and be used to give birth to
The application of object sensor greatly improves its sensitivity and performance.
Sensor of the invention detection refractive index is lower than 1.3 hereinafter, therefore can also be used in the development of novel film material.Low folding
Penetrate rate film (such as Behavior of Nanoporous Silica Films, ice crystal film) led by its transparency, low-heat, low dielectric etc. it is excellent
Good characteristic is widely used in the every field such as production and living.It, can be by being opened in rectangle as the application of the PCF-SPR sensor
Ring the bottom of the channel deposits one or more layers film, by observation spectrometer polishing wax resonance peak wavelength and its drift situation come
To the refractive index parameter or film thickness of film.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to preferred embodiment, those skilled in the art should understand that, it can be right
Technical solution of the present invention is modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (9)
1. a kind of side polishes open ring type PCF-SPR sensor characterized by comprising fibre core and be coated on outside fibre core
Covering, fibre core are equipped with the airport arranged along fibre core axis direction with covering decentraction on covering；Airport includes one first
Airport, multiple second airports and multiple third airports, the first airport are located at cross section of optic fibre center, the second air
Hole is arranged around the first airport in the annular N corner structure that the number of plies is K, and third airport is by replacing the second air hole site pair
Ground is claimed to be located at fibre core two sides；It is provided in optical fiber side and cuts flat with and form surface polishing after polishing treatment, in surface polishing
It is equipped with open loop, is coated with sensing membrane in open loop, open loop is as sensing passage；Surface polishing is located at close to the side of fibre core.
2. side as described in claim 1 polishes open ring type PCF-SPR sensor, which is characterized in that in the core centre
Introducing is provided with the 4th airport, and the 4th air bore dia and the second air pore diameter size ratio are less than 1.
3. as the described in any item sides of claims 1 or 2 polish open ring type PCF-SPR sensor, which is characterized in that described to open
Ring section is rectangle, and open loop size can be determined according to measured matter molecular size.
4. as the described in any item sides of claims 1 or 2 polish open ring type PCF-SPR sensors, which is characterized in that all or
Person part third airport is coated with sensing membrane, and for being used as another sensing passage, and the third air bore dia is greater than second
Air bore dia.
5. side as claimed in claim 4 polishes open ring type PCF-SPR sensor, which is characterized in that utilize the capillary of liquid
Phenomenon or pressuring method fill the liquid that thermo-optical coeffecient is higher than two orders of magnitude of fiber optic materials thermo-optical coeffecient in third airport.
6. side as claimed in claim 4 polishes open ring type PCF-SPR sensor, which is characterized in that on a sensing passage
For being injected with measured matter, another sensing passage improves the anti-external interference energy of sensor for being above injected with reference material
Power.
7. side as claimed in claim 4 polishes open ring type PCF-SPR sensor, which is characterized in that two sensing passages are used
Sensing membrane is determined according to measured matter measured parameter in injection measured matter, sensing passage, is realized while being measured measured matter
Different parameters.
8. as claim 1,2,5,6 or 7 described in any item sides polish open ring type PCF-SPR sensor, which is characterized in that
Sensing membrane is multi-layer film structure.
9. as claim 1,2,5,6 or 7 described in any item sides polish open ring type PCF-SPR sensor, which is characterized in that
Spacing is Λ between each airport, and the first airport and the second airport radius size magnitude range are 0.4 Λ -0.6 Λ, the
Three airport radius size magnitude ranges are 0.6 Λ -1.2 Λ, and the 4th airport radius size magnitude range is 0.1 Λ -0.3
Λ, open loop depth and width magnitude range are 0.5 Λ -2 Λ.
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| CN113514423B (en) * | 2021-06-30 | 2024-02-06 | 泰山学院 | Cut-hole type D-type photonic crystal fiber-based plasma resonance refractive index sensor |
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| WO2015092482A1 (en) * | 2013-12-16 | 2015-06-25 | Nokia Technologies Oy | An apparatus and associated methods for wireless communication |
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| CN106996920A (en) * | 2017-04-19 | 2017-08-01 | 东北石油大学 | A kind of low-refraction PCF spr sensors for being operated in middle-infrared band |
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