CN105572078B - A kind of double-core photonic crystal fiber SRP refractive index sensing models - Google Patents
A kind of double-core photonic crystal fiber SRP refractive index sensing models Download PDFInfo
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- CN105572078B CN105572078B CN201610057845.3A CN201610057845A CN105572078B CN 105572078 B CN105572078 B CN 105572078B CN 201610057845 A CN201610057845 A CN 201610057845A CN 105572078 B CN105572078 B CN 105572078B
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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 kind of double-core photonic crystal fiber SPR refractive index sensing models, its cross section is circle, including substrate 1, fibre core and covering airport 2, fiber core are covering airport, and described fibre core is arranged 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 includes silverskin 5, detection hole 6；Its advantage is, using twin-core and ellipses detection hole SPR refractive index sensing structures, high-order SPP mode is filtered in certain ranges of indices of refraction, it is determined that sensing resonance crest undesired mode distinguishes, High Linear and high sensitivity sensing can be reached, it can in real time be monitored for the solution of refractive index dynamic change, greatly improve sensing efficiency.
Description
Technical field
The invention belongs to photon crystal optical fiber sensing field, particularly with regard to optical fiber sensing technology, tool
It is a kind of double-core photonic crystal fiber SPR refractive index sensing models that body, which is said,.
Background technology
Surface plasma body resonant vibration（SPR）Behavior is a kind of physical optics phenomenon, describes metal or mixes semiconductor
Middle surface plasma（SPP）Covibration, have to being attached to the dielectric variations in refractive index in metal surface it is very sensitive
Characteristic, have the characteristics that in real time and quick detection, need not mark, consumption sample amount it is few, therefore in chemistry, biological, environment and medicine
There is boundless application prospect Deng field, turn into Recent study optical detection sensing technology frontier.
Optical fiber sensory field is with photonic crystal fiber（PCF）Appearance, its good characteristic such as endless single mode is special
Property, high birefringence, controllable dispersion, high non-linearity, structure design it is flexibly controllable etc., receive the extensive concern of researcher,
SPR sensorgram neck has shown huge potential using value.
State Patent Office discloses with the A of Publication No. CN 102590148 that " one kind is easily achieved phase in July, 2012
The application for a patent for invention of the photonic crystal fiber SPR sensorgram model of matching ".The application for a patent for invention uses fibre core cladding structure,
Material is quartz glass, and core centre is provided with fibre core airport, six covering air in regular hexagon arrangement are provided with covering
Hole, the symmetrical covering air internal surface of hole of two of which place-centric with being coated with the internal structure mould of golden film, preferably solve
Fibre core and SPP mode phase matched problem in traditional fiber.But in practice, the photonic crystal fiber basis fibre core
Pattern couples with high-order SPP mode can cause multiple formants, due to the interference of high-order SPP mode, be needed in actually measuring
Advanced row mode distinguishes, finds out required measurement formant and draws refractive index again, for the sensing of medium refraction index change, this is not only
The sensing process that makes is more complicated to also reduce sensing efficiency.
The content of the invention
The technical problem to be solved in the present invention is, for above-mentioned the shortcomings of the prior art or defect, there is provided Yi Zhongshuan
Core photonic crystal fiber SPR refractive index sensing models.The model uses twin-core and ellipses detection pore structure, efficiently solves
High-order SPP mode is to measuring the influence of formant, and with High Linear sensing and highly sensitive characteristic.
The present invention technical solution be：
A kind of double-core photonic crystal fiber SPR refractive index sensing models, its cross section are circle, including substrate, fibre core
With covering airport, fiber core is covering airport, it is characterised in that described fibre core is arranged to right side fibre core and left side is fine
Core；Described right side fibre core is solid base material；Described left side fibre core includes silverskin, detection hole.
The material of substrate and right side fibre core is silica, and its refractive index is 1.45.
Covering airport is 2um with regular hexagon periodic arrangement, covering airport adjacent spacing, and covering airport is a diameter of
1um。
Detection hole is ellipse, and detection hole major axis be 1.6um, minor axis dimension 1.18um, and detection hole is to be measured for placing
Solution.
The silver film thickness is 40nm.
After above structure, compared with prior art, it is an advantage of the invention that：Using twin-core and ellipses detection hole SPR
Refractive index sensing structure, high-order SPP mode is filtered in certain ranges of indices of refraction, it is determined that sensing resonance crest undesired mode is distinguished
Not, High Linear and high sensitivity sensing can be reached, can in real time be monitored for the solution of refractive index dynamic change, greatly improve biography
Feel efficiency.
Brief description of the drawings
Fig. 1 is a kind of double-core photonic crystal fiber SPR refractive index sensings model internal structure schematic diagram of the present invention；
Fig. 2 is a kind of double-core photonic crystal fiber SPR refractive index sensings model sensing characteristicses curve of the present invention；
Fig. 3 is that each SPP mode and right side occurred when solution refractive index to be measured is 1.45 in 900nm-1800nm wave bands is fine
Core formula dispersion curve；
Fig. 4 is that each SPP mode and right side occurred when solution refractive index to be measured is 1.50 in 900nm-1800nm wave bands is fine
Core formula dispersion curve；
In figure：1. substrate, 2. covering airports, 3. right side fibre cores, 4. left side fibre cores, 5. silverskin, 6. detection holes.
Embodiment
The invention will be further described with reference to the accompanying drawings and detailed description：
A kind of double-core photonic crystal fiber SPR refractive index sensing models, its cross section are circle, including substrate 1, fine
Core and covering airport 2, fiber core are covering airport 2, it is characterised in that described fibre core is arranged to the right side He of fibre core 3
Left side fibre core 4；Described right side fibre core 3 is solid base material；Described left side fibre core 4 includes silverskin 5, detection hole 6.
The material of the substrate 1 and right side fibre core 3 is silica, and its refractive index is 1.45.
The covering airport 2 is with regular hexagon periodic arrangement, adjacent spacing 2um, 2 a diameter of 1um of covering airport.
The detection hole 6 is ellipse, and the major axis of detection hole 6 is 1.6um, and minor axis dimension 1.18um, detection hole 6 is for putting
Put solution to be measured.
The thickness of silverskin 5 is 40nm.
The twin-core and the SPR refractive index sensing models of the photonic crystal fiber of oval side core that the present invention uses, utilize right side
The basement membrane of fibre core 3 couples with the SPP mode in left side fibre core 4, is issued to resonance coupling in phase-matching condition, local is fine on right side
The light of core 3 is largely absorbed by the silverskin 5 in left side fibre core 4, and transmission loss reaches peak value.Metal surface is situated between using resonant wavelength
This very sensitive characteristic of matter variations in refractive index realizes the detection to medium refraction index.Sensing characteristicses curve is as shown in Fig. 2 treating
Solution refractive index is in the range of 1.45-1.50 in gaging hole 6, has superelevation linear characteristic, sensitivity reaches 10412nm/RIU.
Detection hole 6 is that ellipse can effectively filter high-order SPP mode, as shown in Figure 3 and Figure 4, represents 900nm- respectively
In 1800nm wave bands, when solution refractive index in gaging hole 6 is 1.45 and 1.5 in all left side fibre cores 4 for occurring SPP mode and
It is phase matching point when SPP mode is identical with basement membrane dispersion with the basement membrane dispersion curve of right side fibre core 3, can with reference to Fig. 3 and Fig. 4
Draw measurement required for being only existed in 1112.37nm-1376.35nm wave bands and 1387.4nm- 1633.75nm wave bands
SPP1 patterns.Corresponding ranges of indices of refraction is 1.45-1.472 and 1.474-1.5, and SPR sensorgram is carried out in the ranges of indices of refraction
Shi Wuxu enters row mode resolution, can effectively simplify sensing step.
A kind of double-core photonic crystal fiber SPR refractive index sensing models of the present invention, it is used as using argent and excites table
Surface plasma metal, sensitivity can reach 10412nm/RIU, have superelevation linearly special in 1.45-1.50 ranges of indices of refraction
Property, detection hole is realized in certain ranges of indices of refraction for elliptical shape and obtained without model distinguishing direct measurement formant for folding
Rate is penetrated, enormously simplify sensing step, increases sensing efficiency.This resulting characteristic is led to following photon crystal optical fiber sensing
Domain has good application value.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Some equivalent substitutes or obvious modification are made on the premise of not departing from present inventive concept, and performance or purposes are identical, then should
It is considered as belonging to the protection domain that claims that the present invention is submitted determine.
Claims (2)
1. a kind of double-core photonic crystal fiber SPR refractive index sensing models, its cross section is circle, including substrate (1), fibre core and
Covering airport (2), fiber core are covering airport (2), it is characterised in that described fibre core is arranged to right side fibre core (3)
With left side fibre core (4)；Described right side fibre core (3) is solid base material；Described left side fibre core (4) includes silverskin (5), inspection
The material of gaging hole (6), described substrate (1) and right side fibre core (3) is silica, and its refractive index is 1.45, described covering
Airport (2) is with regular hexagon periodic arrangement, and covering airport (2) adjacent spacing is 2 μm, a diameter of 1 μ of covering airport (2)
M, described detection hole (6) are ellipse, and detection hole (6) major axis is 1.6 μm, and minor axis dimension is 1.18 μm, and detection hole (6) is used for
Place solution to be measured.
2. a kind of double-core photonic crystal fiber SPR refractive index sensing models as claimed in claim 1, it is characterised 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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| CN105572078B true CN105572078B (en) | 2018-04-10 |
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Families Citing this family (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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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|---|---|---|---|---|
| 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 |
-
2016
- 2016-01-28 CN CN201610057845.3A patent/CN105572078B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| Highly sensitive fiber refractive index sensor based on side-core holey structure;Han Ya et al.;《Chinese Physics B》;20140810;第23卷(第10期);第104219-1至104219-2、104219-5页 * |
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