CN105572078A - Two-core photonic crystal fiber SPR refractive index sensing model - Google Patents
Two-core photonic crystal fiber SPR refractive index sensing model Download PDFInfo
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- CN105572078A CN105572078A CN201610057845.3A CN201610057845A CN105572078A CN 105572078 A CN105572078 A CN 105572078A CN 201610057845 A CN201610057845 A CN 201610057845A CN 105572078 A CN105572078 A CN 105572078A
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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
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
- G01N21/553—Attenuated total reflection and using surface plasmons
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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
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
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Abstract
The invention discloses a two-core photonic crystal fiber SPR refractive index sensing model. The cross section of the two-core photonic crystal fiber SPR refractive index sensing model is round. The two-core photonic crystal fiber SPR refractive index sensing model comprises a substrate 1, fiber cores and cladding air holes 2. The cladding air holes are formed around the fiber cores, the fiber cores include the right fiber core 3 and the left fiber core 4, the right fiber core 3 is made of a solid substrate material, and the left fiber core 4 comprises a silver film 5 and a detection hole 6. The two-core photonic crystal fiber SPR refractive index sensing model has the advantages that by adopting the two-core and oval-detection-hole SPR refractive index sensing structure, the high-order SPP mode can be filtered within a certain refractive index range, sensing resonance wave crests can be determined without mode discrimination, high-linearity and high-sensitivity sensing can be achieved, a solution with the refractive index changing dynamically can be monitored in real time, and sensing efficiency can be greatly improved.
Description
Technical field
The invention belongs to photon crystal optical fiber sensing field, relate in particular to optical fiber sensing technology, tool
Body says it is a kind of double-core photonic crystal fiber SPR refractive index sensing model.
Background technology
Surface plasma body resonant vibration (SPR) behavior is a kind of physical optics phenomenon, describe metal or mix the resonance effect of surface plasma in semiconductor (SPP), have being attached to the highstrung characteristic of the dielectric variations in refractive index in metal surface, have in real time and detect fast, need not mark, consume sample amount and the feature such as to lack, therefore in chemistry, biology, environment and medicine and other fields, there is boundless application prospect, become Recent study optical detection sensing technology frontier.
Optical fiber sensory field is along with the appearance of photonic crystal fiber (PCF), its good characteristic is as controlled etc. flexibly in endless single mode characteristic, high birefringence, controllable dispersion, high non-linearity, structural design, receive the extensive concern of researchist, show huge potential using value at SPR sensing neck.
State Patent Office is the application for a patent for invention that CN102590148A discloses " a kind of photonic crystal fiber SPR sensing model being easy to realize phase matching " in July, 2012 with publication number.This application for a patent for invention adopts fibre core cladding structure, material is quartz glass, core centre is provided with fibre core airport, the covering airport of six arrangements in regular hexagon is provided with in covering, wherein the covering airport inside surface of two place-centric symmetries is coated with the inner structure mould ground of golden film, solves fibre core and SPP modal phase matching problem in traditional fiber preferably.But, in practice, this photonic crystal fiber basis fibre core pattern and high-order SPP Mode Coupling can cause multiple resonance peak, due to the interference of high-order SPP pattern, in actual measurement, need advanced row mode to distinguish, find out required resonance peak of measuring and draw refractive index again, for the sensing of medium refraction index change, sensing process not only made is more complicated also reduces sensing efficiency for this.
Summary of the invention
The technical problem to be solved in the present invention is, the deficiency existed for above-mentioned prior art or defect, provides a kind of double-core photonic crystal fiber SPR refractive index sensing model.This model adopts twin-core and ellipses detection pore structure, efficiently solves high-order SPP pattern to the impact of measuring resonance peak, and has High Linear sensing and highly sensitive characteristic.
Technical solution of the present invention is:
A kind of double-core photonic crystal fiber SPR refractive index sensing model, its xsect is circular, and comprise substrate, fibre core and covering airport, fiber core is covering airport, it is characterized in that, described fibre core is set to right side fibre core and left side fibre core; Described right side fibre core is solid base material; Described left side fibre core comprises silverskin, detect aperture.
The material of substrate and right side fibre core is silicon dioxide, and its refractive index is 1.45.
Covering airport is with regular hexagon periodic arrangement, and the adjacent spacing of covering airport is 2um, and covering airport diameter is 1um.
Detect aperture is oval, and detect aperture major axis is 1.6um, and minor axis dimension is 1.18um, and detect aperture is for placing solution to be measured.
Described silver film thickness is 40nm.
After adopting above structure, compared with prior art, advantage of the present invention is: adopt twin-core and ellipses detection hole SPR refractive index sensing structure, in certain ranges of indices of refraction inner filtration high-order SPP pattern, determine that sensing resonance crest undesired mode distinguishes, can reach High Linear and high sensitivity sensing, the solution for refractive index dynamic change can Real-Time Monitoring, greatly improves sensing efficiency.
Accompanying drawing explanation
Fig. 1 is a kind of double-core photonic crystal fiber SPR of the present invention refractive index sensing model inner structure schematic diagram;
Fig. 2 is a kind of double-core photonic crystal fiber SPR of the present invention refractive index sensing model sensing characteristics curve;
Each SPP pattern that Fig. 3 is solution refractive index to be measured when being 1.45 occurs at 900nm-1800nm wave band and right side fibre core pattern dispersion curve;
Each SPP pattern that Fig. 4 is solution refractive index to be measured when being 1.50 occurs at 900nm-1800nm wave band and right side fibre core pattern dispersion curve;
In figure: 1. substrate, 2. covering airport, fibre core 3., fibre core 4., 5. silverskin, 6. detect aperture.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
A kind of double-core photonic crystal fiber SPR refractive index sensing model, its xsect is circular, and comprise substrate 1, fibre core and covering airport 2, fiber core is covering airport 2, it is characterized in that, described fibre core is set to right side fibre core 3 and left side fibre core 4; Described right side fibre core 3 is solid base material; Described left side fibre core 4 comprises silverskin 5, detect aperture 6.
The material of described substrate 1 and right side fibre core 3 is silicon dioxide, and its refractive index is 1.45.
Described covering airport 2 is with regular hexagon periodic arrangement, and adjacent spacing is 2um, and covering airport 2 diameter is 1um.
Described detect aperture 6 is oval, and detect aperture 6 major axis is 1.6um, and minor axis dimension is 1.18um, and detect aperture 6 is for placing solution to be measured.
Described silverskin 5 thickness is 40nm.
The SPR refractive index sensing model of the photonic crystal fiber of the twin-core that the present invention adopts and oval side core, utilize the SPP Mode Coupling in right side fibre core 3 basement membrane and left side fibre core 4, resonance coupling is issued at phase-matching condition, local is absorbed by the silverskin 5 in left side fibre core 4 in a large number at the light of right side fibre core 3, and loss reaches peak value.Resonant wavelength is utilized to realize the detection to medium refraction index to metal surface medium refraction index change this characteristic very responsive.As shown in Figure 2, treating that in gaging hole 6, solution refractive index is within the scope of 1.45-1.50, have superelevation linear characteristic, sensitivity reaches 10412nm/RIU to sensing characteristics curve.
Detect aperture 6 effectively can filter high-order SPP pattern for ellipse, as shown in Figure 3 and Figure 4, represent in 900nm-1800nm wave band respectively, when in gaging hole 6, solution refractive index is 1.45 and 1.5 occur all left sides fibre core 4 in SPP pattern and and right side fibre core 3 basement membrane dispersion curve, be phase matching point when SPP pattern is identical with basement membrane dispersion, composition graphs 3 and Fig. 4 can draw only to exist in 1112.37nm-1376.35nm wave band and 1387.4nm-1633.75nm wave band required for the SPP1 pattern measured.Corresponding ranges of indices of refraction is 1.45-1.472 and 1.474-1.5, without the need to carrying out pattern resolution when carrying out SPR sensing in this ranges of indices of refraction, effectively can simplify sensing step.
A kind of double-core photonic crystal fiber SPR refractive index sensing model of the present invention, adopt argent as excitating surface plasma metal, sensitivity can reach 10412nm/RIU, there is superelevation linear characteristic in 1.45-1.50 ranges of indices of refraction, detect aperture is that elliptical shape realizes directly measuring resonance peak without the need to model distinguishing and obtains for refractive index in certain ranges of indices of refraction, enormously simplify sensing step, increase sensing efficiency.This characteristic obtained has good using value to following photon crystal optical fiber sensing field.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention; make some equivalent alternative or obvious modification without departing from the inventive concept of the premise; and performance or purposes identical, then should be considered as belonging to the protection domain that claims that the present invention submits to are determined.
Claims (5)
1. a double-core photonic crystal fiber SPR refractive index sensing model, its xsect is circular, and comprise substrate (1), fibre core and covering airport (2), fiber core is covering airport (2), it is characterized in that, described fibre core is set to right side fibre core (3) and left side fibre core (4); Described right side fibre core (3) is solid base material; Described left side fibre core (4) comprises silverskin (5), detect aperture (6).
2. a kind of double-core photonic crystal fiber SPR refractive index sensing model as claimed in claim 1, is characterized in that, described substrate (1) and the material of right side fibre core (3) are silicon dioxide, and its refractive index is 1.45.
3. a kind of double-core photonic crystal fiber SPR refractive index sensing model as claimed in claim 1, it is characterized in that, described covering airport (2) is with regular hexagon periodic arrangement, and covering airport (2) adjacent spacing is 2um, and covering airport (2) diameter is 1um.
4. a kind of double-core photonic crystal fiber SPR refractive index sensing model as claimed in claim 1, it is characterized in that, described detect aperture (6) is oval, and detect aperture (6) major axis is 1.6um, minor axis dimension is 1.18um, and detect aperture (6) is for placing solution to be measured.
5. a kind of double-core photonic crystal fiber SPR refractive index sensing model as claimed in claim 1, it is characterized in that, described silverskin (5) thickness is 40nm.
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| CN201610057845.3A CN105572078B (en) | 2016-01-28 | 2016-01-28 | A kind of double-core photonic crystal fiber SRP refractive index sensing models |
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| CN201610057845.3A CN105572078B (en) | 2016-01-28 | 2016-01-28 | A kind of double-core photonic crystal fiber SRP refractive index sensing models |
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| CN105572078B CN105572078B (en) | 2018-04-10 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891944A (en) * | 2016-06-19 | 2016-08-24 | 南昌航空大学 | Side-core SPR refractive index sensing model based on pohotonic crystal fiber |
| CN108303399A (en) * | 2018-01-06 | 2018-07-20 | 黑龙江磐桓科技有限公司 | A kind of twin-core fiber two-way surface plasma resonance sensor |
| CN108956530A (en) * | 2018-04-15 | 2018-12-07 | 桂林电子科技大学 | A kind of index sensor based on bragg fiber end face gold hole array structure |
| CN108956531A (en) * | 2018-04-15 | 2018-12-07 | 桂林电子科技大学 | A kind of index sensor of fiber end face dielectric-metallic array of circular apertures structure |
| CN109405858A (en) * | 2018-12-14 | 2019-03-01 | 东北大学 | A kind of novel D type microstructure fiber sensor and preparation method thereof |
| CN109901262A (en) * | 2019-04-17 | 2019-06-18 | 北京交通大学 | A kind of Side polishing fiber double-core photonic crystal fiber polarization converter of graphene coating |
| CN110596051A (en) * | 2019-09-01 | 2019-12-20 | 桂林电子科技大学 | Double-core D-type photonic crystal fiber SPR sensor based on graphene coating |
| CN112444914A (en) * | 2020-11-20 | 2021-03-05 | 燕山大学 | D-type photonic crystal fiber tunable polarization filter based on gold film coating and manufacturing method |
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| US5585634A (en) * | 1994-09-29 | 1996-12-17 | Foster-Miller, Inc. | Attenuated total reflectance sensing |
| CN102590148A (en) * | 2012-02-28 | 2012-07-18 | 天津理工大学 | Photonic crystal fiber SPR (Surface Plasmon Resonance) sensing model easily realizing phase matching |
| CN102608068A (en) * | 2012-03-09 | 2012-07-25 | 天津理工大学 | Photonic crystal fiber SPR (Surface Plasmon Resonance) sensing model with novel structure |
| CN203037578U (en) * | 2012-12-17 | 2013-07-03 | 南京航空航天大学 | Composite film layer based optical fiber plasma wave sensor and sensing detecting system thereof |
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2016
- 2016-01-28 CN CN201610057845.3A patent/CN105572078B/en not_active Expired - Fee Related
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891944A (en) * | 2016-06-19 | 2016-08-24 | 南昌航空大学 | Side-core SPR refractive index sensing model based on pohotonic crystal fiber |
| CN108303399A (en) * | 2018-01-06 | 2018-07-20 | 黑龙江磐桓科技有限公司 | A kind of twin-core fiber two-way surface plasma resonance sensor |
| CN108303399B (en) * | 2018-01-06 | 2019-04-19 | 浙江昌亮消防科技有限公司 | A kind of twin-core fiber two-way surface plasma resonance sensor |
| CN108956530A (en) * | 2018-04-15 | 2018-12-07 | 桂林电子科技大学 | A kind of index sensor based on bragg fiber end face gold hole array structure |
| CN108956531A (en) * | 2018-04-15 | 2018-12-07 | 桂林电子科技大学 | A kind of index sensor of fiber end face dielectric-metallic array of circular apertures structure |
| CN108956530B (en) * | 2018-04-15 | 2021-05-11 | 桂林电子科技大学 | Refractive index sensor based on Bragg fiber end face gold hole array structure |
| CN109405858A (en) * | 2018-12-14 | 2019-03-01 | 东北大学 | A kind of novel D type microstructure fiber sensor and preparation method thereof |
| CN109901262A (en) * | 2019-04-17 | 2019-06-18 | 北京交通大学 | A kind of Side polishing fiber double-core photonic crystal fiber polarization converter of graphene coating |
| CN109901262B (en) * | 2019-04-17 | 2020-08-04 | 北京交通大学 | Graphene-coated side polishing and grinding dual-core photonic crystal fiber polarization converter |
| CN110596051A (en) * | 2019-09-01 | 2019-12-20 | 桂林电子科技大学 | Double-core D-type photonic crystal fiber SPR sensor based on graphene coating |
| CN112444914A (en) * | 2020-11-20 | 2021-03-05 | 燕山大学 | D-type photonic crystal fiber tunable polarization filter based on gold film coating and manufacturing method |
| CN112444914B (en) * | 2020-11-20 | 2022-03-15 | 燕山大学 | D-type photonic crystal fiber tunable polarization filter based on gold film coating and manufacturing method |
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Granted publication date: 20180410 Termination date: 20200128 |