CN105651738A - Helical-core optical fiber SPR sensor - Google Patents
Helical-core optical fiber SPR sensor Download PDFInfo
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Abstract
The invention belongs to the technical field of optical fiber SPR sensing, and particularly relates to a helical-core optical fiber SPR sensor which can be widely applied in the fields of biosensing, chemical analysis, medicine research and development, food safety, environment monitoring and medical diagnosis. The helical-core optical fiber SPR sensor is composed of an input optical fiber 1, a fiber core 2 of the input optical fiber, an optical fiber welding face, a helical optical fiber core 4, an optical fiber D-shaped section 5, a gold nanofilm 6, an output optical fiber 8 and a fiber core 9 of the output optical fiber. The helical-core optical fiber SPR sensor has the advantage that a bending structure of each fiber core is disposed inside the corresponding optical fiber; equivalent curvature radius of a helical is used to replace bending radius of the optical fiber, so that small bending radius that a bent optical fiber cannot realize can be realized; effective single-mode output can be provided by reasonably setting geometric and physical parameters, so that resolution and stability of SPR measuring are improved.
Description
Technical field
The invention belongs to optical fiber field of sensing technologies, particularly relate to a kind of helical-core fiber spr sensor that can be widely applied to the fields such as bio-sensing, chemical analysis, drug research and development, food safety, environmental monitoring, medical diagnosis.
Background technology
Sensing and processing has become as the core in modern information technologies field, and social development, scientific and technological progress are played an important role. Sensor, as parts most crucial in sensing and processing system, region be directly facing measured object, is signal by measurand Parameters Transformation, is the important foundation of modern information technologies, has a wide range of applications in modern social development. Applications of surface plasmon resonance (SurfacePlasmonResonance, SPR) is with its characteristic that medium refraction index slight change is extremely sensitive to external world, increasingly extensive in the application of sensory field in recent years, and obtains development at full speed. SPR technique and optical fiber sensing technology are effectively combined by optical fiber sensing technology, it is achieved optical fiber surface plasmon resonance body sensing measurement. Optical fiber SPR sensor has the advantage that traditional sensors part is incomparable, it is possible to for the measurement of very small space. Conventional spr sensor adopts prism as optical coupling device, owing to prism volume is big, device arranges requirement height, therefore limit its application, and use optical fiber as coupled apparatus, can be used not only for small space and realize measuring, and stable performance, it is susceptible to the impact of extraneous factor. Additionally, optical fiber SPR sensor possessed optical fiber can long-distance transmissions and the good feature of real-time, therefore optical fiber SPR sensor can realize the function of remote real-time online detection. Optical fiber SPR sensor can also effectively and other optics carry out integrated, there is good stability and motility.
Surface plasma body resonant vibration is a kind of physical optics phenomenon, surface plasma wave is the electromagnetic wave propagated along interface between metal and electrolyte, when specific wavelength polarized light occurs to be totally reflected so that a certain specific angle incides separating surface, incident illumination is coupled as surface plasma wave and is attenuated, cause the light energy that interface is totally reflected exponentially to decay, surface plasma body resonant vibration occurs.Angle of incidence during resonance is occurred to be called resonance angle. In actual application, in order to obtain resonance angle, generally straight wave guide optical fiber is carried out the operating procedure of series of complex, in the hope of obtaining resonance angle. Document (AnalyticalChemistry, 0003-2700,1994,66 volumes, 7 phases, 963 pages) in describe a kind of manufacture method, first optical fiber coating is removed, then optical fiber is pasted in the aluminum polished silicon wafer of a bending, the process of polishing needs monitor with helium neon laser beam, when rubbing down is to, when being begun to decline by the laser intensity of light, stopping rubbing down, this kind of method complex process, and it is relatively low to prepare precision. Document (SensorsandActuatorsB51 (1998) 311 315) and document (SensorsandActuatorsB29 (1995) 401-405) are although the middle spr sensor introduced obtains good sensing characteristics, but in order to obtain the condition of resonance, it is all to obtain resonance angle by curved fiber, due to fiber optic materials characteristic, optical fiber is easy to be broken off, and stability and concordance are poor.
Increasingly extensive along with spr sensor application, its application prospect wide in a lot of fields obtains the approval of researcher, and increasing scholar is attracted by application prospect and the potentiality of spr sensor, puts in the middle of spr sensor research.
Application number be 201510400263.6 patent of invention in describe a kind of distributed surface plasma resonance optical fiber sensor, on twin-core fiber, processing has the V-groove meeting certain distribution of lengths that misplaces in pairs, V-groove inclined-plane is coated with sensing layer, link although the optical fiber SPR sensor of this kind of structure can carry out low-loss with all optical fiber system well, but owing to preparation technology requirement is higher, be difficult to batch preparation. Application number a kind of optical fiber local surface plasma resonance sensor based on periodicity metal structure that has been the patent Introduction of 201410610073.2, the outer peripheral face of the sensing unit of fiber core is provided with the periodicity metal nano helicoidal structure of nanoscale, to excite local surface plasma resonance effect. Application number is that 200910073960.X patent proposes a kind of glass prism SPR high sensitivity optical fiber liquid refractive index sensor, adopts prism as coupled apparatus, and volume is big, limits its range of application. Application number be 201210067372. patent in the D-type optical fiber spr sensor introducing a kind of graphene film enhanced sensitivity and preparation method thereof, increase the sensitivity of this spr sensor at silver film surface deposited graphite alkene thin layer. The method has certain novelty, has highly sensitive and that response is fast advantage, but does not have new improvement on sensor construction, reaches plasma resonance condition relatively difficult.
The present invention is directed to the above advantage in first technology existence and deficiency. A kind of helical-core fiber spr sensor is proposed. The helical buckling structure of fibre core is to be built in the inside of optical fiber, by reasonably arranging the geometric parameter such as pitch and curvature, it is possible not only to effective by higher order mode removal, realize single mode transport, thus realizing the measurement of high-resolution, high stability SPR, and by the SPR resonance angle obtaining various angles, thus meeting different measurement demands. The present invention, while remaining that all-fiber spr sensor volume is little, being not easily affected by the external environment, also has the features such as making is simple, practical.
Summary of the invention
It is an object of the invention to provide one and have that high-resolution, stability is strong, simple in construction, it may be achieved the helical-core fiber spr sensor of the features such as different angles SPR resonance angle.
The object of the present invention is achieved like this:
A kind of helical-core fiber spr sensor, by input optical fibre 1, the fibre core 2 of input optical fibre, optical fiber solder side, Helical Fiber core 4, optical fiber D type profile 5, gold nano film 6, output optical fibre 8, output optical fibre fibre core 9 form; Described helical-core fiber spr sensor, is each welded a segment standard single-mode fiber by two ends, the sandwich structure composition of one section of helical-core fiber of middle welding; Helical-core fiber is by mean of heat and melts what rotation technique was prepared from; By adopting optical fiber side throwing method so that this helical-core fiber part fiber core is exposed, finally, sputtering method is adopted to prepare the gold nano film of suitable thickness at this burnishing surface; Just constitute this Novel spiral core fibre spr sensor.
In the present invention, metal film adopts gold or argent to prepare; The thickness of film is 50nm.
Described helical-core fiber spr sensor two ends and standard single-mode fiber are attached or are fabricated to standard fiber device, insert in optical measuring system.
The beneficial effects of the present invention is:
The present invention adopts helical-core fiber structure fabrication optical fiber SPR sensor, and the advantage of this helical-core fiber is in that the warp architecture of fibre core is placed in inside of optical fibre. The bending radius of optical fiber is replaced by the equivalent radius of curvature of spiral, the irrealizable small-bend radius of curved fiber can be realized, by reasonably arranging geometry and physical parameter, it is provided that an effective single-mode output, improve the SPR resolution measured and stability, in addition, helical-core fiber another one advantage is adopted to be in that, it is easier to find SPR resonance angle, by adjusting the pitch of Helical Fiber, the SPR resonance angle of various angle can be obtained, and then meet different measurement demands. The present invention also has while remaining that all-fiber spr sensor volume is little, being not easily affected by the external environment and makes advantage simple, that concordance is good, be suitable to lot-sizeization makes.
Accompanying drawing explanation
Fig. 1 is helical-core fiber spr sensor schematic diagram.
Fig. 2 is helical-core fiber structural representation.
Fig. 3 is the floor map in the helical-core fiber rectangular coordinate system in a cycle.
Fig. 4 monocycle helical-core fiber SPR rectangular coordinate structural representation.
Mono-section of helix core of Fig. 5 analyzes schematic diagram in Helical coordinate system.
Fig. 6 is that helical-core fiber SPR reflection power is set a song to music line chart.
Detailed description of the invention
The present invention is expanded on further below in conjunction with concrete accompanying drawing.
The present invention is to provide a kind of helical-core fiber spr sensor. It is characterized in that: it by input optical fibre 1, the fibre core 2 of input optical fibre, optical fiber solder side 3 and 7, Helical Fiber core 4, optical fiber D type profile 5, gold nano film 6, output optical fibre 8, output optical fibre fibre core 9 form. The present invention adopts eccentric core fiber, melts rotation technique by means of heat and prepares helical-core fiber, adopts optical fiber side to throw method and makes eccentric screw fiber cores exposed; Adopting sputtering method to prepare nano-gold film, two ends adopt and are directed at, with standard single-mode fiber, the method for attachment welded, and have namely prepared into helical-core fiber spr sensor, and the present invention is the spr sensor of a kind of high sensitivity full fiber type. This helical-core fiber proposed by the invention, the twisted shape of fibre core builds in the inside of optical fiber, by reasonably arranging the geometric parameter such as pitch and curvature and physical parameter, effectively higher order mode can be removed, realize single mode transport, thus obtaining the high-resolution of SPR sensorgram and the stability of measurement. And the geometric parameter passing through adjustment helical-core fiber can obtain the SPR resonance angle of various angle, and then meet different measurement demands.The present invention also have while remaining that all-fiber spr sensor volume is little, being not easily affected by the external environment make simple, be suitable for the feature that lot-sizeization produces. The fields such as this optical fiber SPR sensor is easy to use, can be widely applied to bio-sensing, chemical analysis, drug research and development, food safety, environmental monitoring, medical diagnosis. By the diameter of helical-core fiber fibre core, the pitch of helix core and these geometric parameters of spiral curvature are reasonably arranged, it is possible to higher order mode is effectively filtered, it is achieved single mode transport. Helix core in optical fiber, presents gradual trend, and the sensitive zones needs according to SPR resonance condition, by the size of SPR resonance angle, it is determined that gold nano film tangential plane and fibre core boundary optimum resonance angle, ��. Optical fiber side throwing method is adopted to make fiber cores exposed, do not lose the spirit of the present invention, etching or Ultra-Violet Laser micro-machined method digging groove method can also be adopted to make fiber core exposed at corresponding spiral core portion, in order to the gold nano film being coated with outside constitutes SPR resonance condition.
A kind of helical-core fiber spr sensor it be made up of input optical fibre 1, the fibre core 2 of input optical fibre, optical fiber solder side 3 and 7, Helical Fiber core 4, optical fiber D type profile 5, gold nano film 6, output optical fibre 8, output optical fibre fibre core 9. Described helical-core fiber spr sensor, is each welded a segment standard single-mode fiber by two ends, the sandwich structure composition of one section of helical-core fiber of middle welding. Helical-core fiber is by mean of heat and melts what rotation technique was prepared from. By adopting optical fiber side throwing method so that this helical-core fiber part fiber core is exposed, finally, sputtering method is adopted to prepare the gold nano film of suitable thickness at this burnishing surface. Just constitute this Novel spiral core fibre spr sensor. As Fig. 1 is made up of input optical fibre 1, the fibre core 2 of input optical fibre, optical fiber solder side 3 and 7, Helical Fiber core 4, optical fiber D type profile 5, gold nano film 6, output optical fibre 8, output optical fibre fibre core 9.
This helical-core fiber spr sensor, is by the diameter of helical-core fiber fibre core, the pitch of helix core and these geometric parameters of spiral curvature are reasonably arranged, it is possible to effectively filtered by higher order mode, it is achieved single mode transport. First, adopt eccentric core fiber to be prepared, melt rotation technique by means of heat and prepare helical-core fiber; Secondly, optical fiber side throwing method is adopted to make fiber cores exposed; Then, sputtering method is adopted to prepare nano-gold film.
This helical-core fiber spr sensor is in the process built, and the helix core in optical fiber presents gradual trend, the sensitive zones needs according to SPR resonance condition, by the size of SPR resonance angle, determines gold nano film tangential plane and fibre core boundary optimum resonance angle, ��.
The sensing unit of this helical-core fiber spr sensor is to adopt optical fiber side throwing method to make fiber cores exposed, do not lose the spirit of the present invention, etching or Ultra-Violet Laser micro-machined method digging groove method can also be adopted to make fiber core exposed at corresponding spiral core portion, in order to the gold nano film being coated with outside constitutes SPR resonance condition.
Metal film in this helical-core fiber spr sensor, both can adopt gold, it would however also be possible to employ prepared by argent. When adopting gold preparation nanometer film, there is the advantages such as highly sensitive, fast response time, good stability. Such as: the thickness of gold film is chosen as 50nm.
The two ends of this helical-core fiber spr sensor can be attached with standard single-mode fiber, can be fabricated to standard fiber device on the one hand, inserts in optical measuring system. On the other hand, it is also possible to realize long-distance transmissions, long-range SPR optical fiber sensing system is constituted.
Fig. 1 gives helical-core fiber spr sensor structural representation. Helical-core fiber spr sensor is made up of input optical fibre 1, the fibre core 2 of input optical fibre, optical fiber solder side 3 and 7, Helical Fiber core 4, optical fiber D type profile 5, gold nano film 6, output optical fibre 8, output optical fibre fibre core 9.
Helical-core fiber spr sensor, first, adopts eccentric core fiber to be prepared, melts rotation technique by means of heat and prepare helical-core fiber; Secondly, optical fiber side throwing method is adopted to make fiber cores exposed; Then, sputtering method is adopted to prepare nano-gold film.
In order to be better understood from how this helical-core fiber spr sensor realizes, detailed mathematical description is given below:
Fig. 2 gives helical-core fiber structural representation, and wherein P is helical-core fiber fibre core pitch, and Q is the side-play amount of fibre core distance central shaft, RBFor equivalence radius of curvature, as shown in Figure 5.
Helical-core fiber is the bending utilizing the equivalent radius of curvature of spiral to replace optical fiber, thus producing suitable SPR resonance angle. Equivalence radius of curvature and resonance angle �� can utilize following formula to be indicated:
Wherein �� is the angle between the transmission direction at gold nano film tangent plane and fiber cores point of contact place.
The helical-core fiber that the present invention adopts can have certain radiation loss, it is possible to analyze the modal loss characteristic of helical-core fiber by means of 3D-scalar beam propagation method. It is modeled emulation, in detail research lumped parameter and the physical parameter impact on helical-core fiber modal loss, to obtain basic mode transmission characteristic by software. Fig. 3 is the projection on XOY, XOZ, YOZ face of the helix core in a cycle. The geometric parameter of optical fiber is optimized further according to high-order mode loss formula (2) and (3) of basic mode bending loss formula and K.S.Kaufman model in Marcuse type optical.
According to surface plasma body resonant vibration condition, namely the wave vector in fibre core is when the component of X-direction is vowed equal with surface plasma wave, energy coupling occurs, produces surface plasmon resonance. The reflectance of whole optical fiber SPR sensor can be derived by Fresnel formula, and then obtain the power spectrum curve of SPR, it is achieved the measurement of testing medium.
Claims (3)
1. a helical-core fiber spr sensor, by input optical fibre (1), the fibre core (2) of input optical fibre, optical fiber solder side, Helical Fiber core (4), optical fiber D type profile (5), gold nano film (6), output optical fibre (8), output optical fibre fibre core (9) form; It is characterized in that: described helical-core fiber spr sensor, be each welded a segment standard single-mode fiber by two ends, the sandwich structure composition of one section of helical-core fiber of middle welding; Helical-core fiber is by mean of heat and melts what rotation technique was prepared from; By adopting optical fiber side throwing method so that this helical-core fiber part fiber core is exposed, finally, sputtering method is adopted to prepare the gold nano film of suitable thickness at this burnishing surface; Just constitute this Novel spiral core fibre spr sensor.
2. a kind of helical-core fiber spr sensor according to claim 1, it is characterised in that: in the present invention, metal film adopts gold or argent to prepare; The thickness of film is 50nm.
3. a kind of helical-core fiber spr sensor according to claim 1, it is characterised in that: described helical-core fiber spr sensor two ends and standard single-mode fiber are attached or are fabricated to standard fiber device, insert in optical measuring system.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911026A (en) * | 2016-06-27 | 2016-08-31 | 武汉理工大学 | Terminal reflection type spiral core fiber surface plasma resonance sensor |
| CN105911025A (en) * | 2016-06-27 | 2016-08-31 | 武汉理工大学 | Distributed spiral core optical fiber surface plasmon resonance sensor and measurement method thereof |
| CN107084752A (en) * | 2017-04-20 | 2017-08-22 | 电子科技大学 | Optical fiber microbubble concentration sensor and its method for sensing based on nano-gold film |
| CN107884367A (en) * | 2017-10-12 | 2018-04-06 | 重庆三峡学院 | A kind of dumbbell optical fiber detects micro flow chip |
| CN108279208A (en) * | 2018-03-21 | 2018-07-13 | 南京信息工程大学 | 45 degree of fibre optical sensors based on surface phasmon effect and preparation method |
| CN109490278A (en) * | 2018-09-10 | 2019-03-19 | 桂林电子科技大学 | The rotary SPR of triangle microprism tests optical chip |
| CN109490279A (en) * | 2018-09-10 | 2019-03-19 | 桂林电子科技大学 | The rotary SPR sensorgram chip of D-shaped microtrabeculae mirror |
| CN109540847A (en) * | 2018-12-13 | 2019-03-29 | 山东师范大学 | A kind of graphene/gold/D plastic optical fiber SPR sensor and preparation method |
| CN109655431A (en) * | 2018-12-12 | 2019-04-19 | 桂林电子科技大学 | Toroidal cores optical fiber SPR sensor |
| CN110132893A (en) * | 2019-05-16 | 2019-08-16 | 西安柯莱特信息科技有限公司 | A kind of gas detector based on optical fiber structure |
| CN111457862A (en) * | 2020-05-25 | 2020-07-28 | 重庆三峡学院 | Optical fiber SPR curvature sensor with direction recognition function and using and manufacturing method thereof |
| CN113029216A (en) * | 2021-03-05 | 2021-06-25 | 桂林电子科技大学 | Multi-parameter sensor based on coaxial double-waveguide optical fiber |
| CN113671629A (en) * | 2021-08-26 | 2021-11-19 | 桂林电子科技大学 | New method for constructing plasma wave interferometer in optical fiber core |
| CN117148526A (en) * | 2023-10-30 | 2023-12-01 | 西安西古光通信有限公司 | Novel optical fiber |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911025A (en) * | 2016-06-27 | 2016-08-31 | 武汉理工大学 | Distributed spiral core optical fiber surface plasmon resonance sensor and measurement method thereof |
| CN105911026B (en) * | 2016-06-27 | 2018-06-12 | 武汉理工大学 | A kind of end reflection type helical-core fiber surface plasma resonance sensor |
| CN105911025B (en) * | 2016-06-27 | 2018-10-23 | 武汉理工大学 | A kind of distribution helical-core fiber surface plasma resonance sensor and its measurement method |
| CN105911026A (en) * | 2016-06-27 | 2016-08-31 | 武汉理工大学 | Terminal reflection type spiral core fiber surface plasma resonance sensor |
| CN107084752B (en) * | 2017-04-20 | 2020-02-14 | 电子科技大学 | Optical fiber microbubble concentration sensor based on nanogold film and sensing method thereof |
| CN107084752A (en) * | 2017-04-20 | 2017-08-22 | 电子科技大学 | Optical fiber microbubble concentration sensor and its method for sensing based on nano-gold film |
| CN107884367A (en) * | 2017-10-12 | 2018-04-06 | 重庆三峡学院 | A kind of dumbbell optical fiber detects micro flow chip |
| CN107884367B (en) * | 2017-10-12 | 2023-09-22 | 重庆三峡学院 | Dumbbell optical fiber SPR (surface plasmon resonance) detection microfluidic chip |
| CN108279208A (en) * | 2018-03-21 | 2018-07-13 | 南京信息工程大学 | 45 degree of fibre optical sensors based on surface phasmon effect and preparation method |
| CN108279208B (en) * | 2018-03-21 | 2023-05-05 | 南京信息工程大学 | 45-degree optical fiber sensor based on surface plasmon effect and preparation method |
| CN109490278A (en) * | 2018-09-10 | 2019-03-19 | 桂林电子科技大学 | The rotary SPR of triangle microprism tests optical chip |
| CN109490279A (en) * | 2018-09-10 | 2019-03-19 | 桂林电子科技大学 | The rotary SPR sensorgram chip of D-shaped microtrabeculae mirror |
| CN109655431A (en) * | 2018-12-12 | 2019-04-19 | 桂林电子科技大学 | Toroidal cores optical fiber SPR sensor |
| CN109540847A (en) * | 2018-12-13 | 2019-03-29 | 山东师范大学 | A kind of graphene/gold/D plastic optical fiber SPR sensor and preparation method |
| CN110132893A (en) * | 2019-05-16 | 2019-08-16 | 西安柯莱特信息科技有限公司 | A kind of gas detector based on optical fiber structure |
| CN111457862A (en) * | 2020-05-25 | 2020-07-28 | 重庆三峡学院 | Optical fiber SPR curvature sensor with direction recognition function and using and manufacturing method thereof |
| CN113029216A (en) * | 2021-03-05 | 2021-06-25 | 桂林电子科技大学 | Multi-parameter sensor based on coaxial double-waveguide optical fiber |
| CN113671629A (en) * | 2021-08-26 | 2021-11-19 | 桂林电子科技大学 | New method for constructing plasma wave interferometer in optical fiber core |
| CN113671629B (en) * | 2021-08-26 | 2022-07-29 | 桂林电子科技大学 | New method for constructing plasma wave interferometer in optical fiber core |
| CN117148526A (en) * | 2023-10-30 | 2023-12-01 | 西安西古光通信有限公司 | Novel optical fiber |
| CN117148526B (en) * | 2023-10-30 | 2024-01-30 | 西安西古光通信有限公司 | Novel optical fiber |
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Application publication date: 20160608 |