CN111272706A - Optical fiber SPR sensing head - Google Patents
Optical fiber SPR sensing head Download PDFInfo
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- CN111272706A CN111272706A CN202010214364.5A CN202010214364A CN111272706A CN 111272706 A CN111272706 A CN 111272706A CN 202010214364 A CN202010214364 A CN 202010214364A CN 111272706 A CN111272706 A CN 111272706A
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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
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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Abstract
The invention discloses an optical fiber SPR sensing head, which comprises: a tapered optical fiber; the gold film is plated on the outer surface of the tapered optical fiber; and a barium titanate film plated on the surface of the gold film. The optical fiber SPR sensing head has two working modes, and in one mode, compared with the traditional SPR sensor, the optical fiber SPR sensing head has high measuring sensitivity, and in addition, in the other mode, the sensor can work in a complex measuring environment, so that the external error interference can be effectively overcome, and the measuring accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of liquid refractive index detection and the like, and particularly relates to an optical fiber SPR sensing head.
Background
The refractive index is an inherent property of a substance and is also an important basis for analyzing substance information. The refractive index detection is deep into a plurality of fields such as gas component analysis, food safety, environmental monitoring, biological analysis and medical detection, so that the realization of high-quality refractive index detection has great significance. Currently, methods for solution refractive index measurement are: optical fiber Abbe refraction, Young's interference, grazing incidence, laser irradiation, etc. These methods can measure the refractive index of the solution, but have some disadvantages, such as that Abbe instrument can only measure the refractive index of the transparent liquid; the Young's interference method has high precision but poor stability; the total reflection principle of the grazing incidence method limits the measurement range of the grazing incidence method; the laser irradiation method has a wide measurement range but requires a large amount of liquid during measurement.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical fiber SPR sensor head.
The invention provides a fiber SPR sensing head, which is characterized by comprising: a tapered optical fiber; the gold film is plated on the outer surface of the tapered optical fiber; and a barium titanate film plated on the surface of the gold film.
The optical fiber SPR sensing head provided by the invention can also have the following characteristics: wherein, the length of toper optic fibre is 34um, and the diameter of toper pointed end bottom is 1.5 um.
The optical fiber SPR sensing head provided by the invention can also have the following characteristics: wherein the thickness of the gold film is 50 nm.
The optical fiber SPR sensing head provided by the invention can also have the following characteristics: wherein the thickness of the barium titanate film is 40 nm.
Action and Effect of the invention
According to the optical fiber SPR sensing head, the polymer tapered optical fiber is used as a structure main body, and the barium titanate film material is plated on the outer layer of the structure, so that three absorption peaks appear in a reflection spectrum, the two absorption peaks are used for sensing before use, the sensitivity of the sensor can be doubled by adding the two peak values for sensing, the external strong interference can be eliminated by subtracting the two peak values for sensing, and the measurement accuracy is greatly improved.
Therefore, the optical fiber SPR sensing head has two working modes, and has the advantages of high sensitivity and high accuracy.
Drawings
FIG. 1 is a schematic diagram of the structure of a fiber SPR sensor head in an embodiment of the present invention;
FIG. 2 is a spectral plot of a fiber SPR sensor head in one measurement, in accordance with embodiments of the present invention.
Detailed Description
In order to make the technical means and functions of the present invention easy to understand, the present invention is specifically described below with reference to the embodiments and the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of a fiber SPR sensor head in an embodiment of the present invention.
As shown in fig. 1, an optical fiber SPR sensing head 100 of the present embodiment includes: tapered optical fiber 10, gold film 20, and barium titanate film 30.
The tapered optical fiber 10 is a polymer tapered optical fiber, which takes a tapered optical fiber as a structural base, light is coupled into the optical fiber from an incident end, and the tail of the optical fiber is manufactured into a tapered tip by a special method. The light carries the refractive index information of the foreign matter at the sensing position at the tail part of the optical fiber and is reflected back to the original incident end.
In this embodiment, the manufacturing principle of the polymer tapered optical fiber is as follows: laser with certain intensity and wavelength of 450nm to 550nm is coupled into the single-mode fiber, and the photosensitive reagent coated on the end face of the exit end of the fiber initiates a cross-linking polymerization reaction under the irradiation of the laser, so that a polymer conical tip is formed. The formula of the photosensitive reagent is as follows: the multifunctional acrylate monomer pentaerythritol triacrylate PETIA, eosin-Y, namely Esion-Y, and methyldiethanolamine MDEA have flexible reagent proportion, can change the property of a photosensitive reagent, and further influence the size parameter of the polymer tapered optical fiber.
In this embodiment, the optimal length of the tapered fiber 10 is 34um, and the diameter of the bottom of the tapered tip is 1.5 um.
The gold film 20 is plated on the outer surface of the tapered optical fiber 10, and has a thickness of 50 nm.
In this embodiment, the polymer tapered fiber is plated with a metallic Au layer on its exterior. The coating method comprises a chemical method and a physical method, wherein the chemical method comprises a chemical vapor deposition method, a liquid phase generation method, an oxidation method, a diffusion method, an electroplating method and the like, and the physical method comprises a vacuum thermal evaporation method, a direct current sputtering method, a magnetron sputtering method, a radio frequency sputtering method, a pulse laser deposition method, a molecular beam epitaxial growth method and the like.
The barium titanate film 30 is plated on the surface of the gold film 20 to a thickness of 40 nm.
In this embodiment, a barium titanate crystal thin film with a certain thickness is coated on the gold film 20. The preparation method of the crystal film comprises magnetron sputtering, metal organic chemical vapor deposition, molecular beam epitaxy, sol-gel, pulse laser deposition and the like.
FIG. 2 is a spectral plot of a fiber SPR sensor head in one measurement, wherein the abscissa represents wavelength and the ordinate represents light reflectance, in accordance with embodiments of the present invention.
Fiber SPR sensor head 100 of the present embodiment is configured to select a broad spectrum light source and to select different concentrations of saline as the measurement substance prior to measurement. When light is incident into the tapered optical fiber 10 and reaches the tip of the polymer tapered optical fiber, due to the gold film 20 and the barium titanate film 30 coated outside the polymer, the incident light excites free electrons on the metal surface to form surface plasmon resonance, and the incident light energy is significantly attenuated at the resonance wavelength, as shown in fig. 2, three resonance absorption peaks are observed in the reflection spectrum. Two absorption peaks with smaller wavelength shift with the change of the refractive index of the saline water and have good linear relation.
In the first working mode, the linear relation between the sum of the two resonance wavelengths and the saline water refractive index is utilized, the saline water refractive index can be obtained through the resonance wavelengths and the sum, and then the corresponding saline water concentration is obtained.
In the second working mode, the linear relation between the difference value of the two resonance wavelengths and the refractive index of the saline water is utilized, the refractive index of the saline water can be obtained through the difference value of the resonance wavelengths, and then the corresponding saline water concentration is obtained.
From the above, three resonance absorption peaks appear in the spectrum, wherein the two resonance wavelengths with smaller wavelengths both show good linear relationship with the refractive index of the substance outside the sensor head. In addition, the sum and the difference of the two peak wavelengths are proved to have better linear relation with the refractive index of a substance outside the sensor head in a mathematical way. When applied to SPR sensor measurements using two resonant wavelengths and values, the sensitivity of the sensor is nearly doubled compared to previous SPR sensors. When the difference value of the two resonance wavelengths is used for measurement of the SPR sensor, the sensor can overcome strong interference of an external measurement environment, and the measurement accuracy of the sensor is improved.
Effects and effects of the embodiments
According to the optical fiber SPR sensing head related to the embodiment, the polymer tapered optical fiber is adopted as the structure main body, and the barium titanate film material is plated on the outer layer of the structure, so that three absorption peaks appear in the reflection spectrum, two absorption peaks are used for sensing before use, the sensitivity of the sensor can be multiplied when the two peaks are added for sensing, the external strong interference can be eliminated when the two peaks are subtracted for sensing, and the measurement accuracy is greatly improved.
Therefore, the optical fiber SPR sensing head has two working modes, and has the advantages of high sensitivity and high accuracy.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (4)
1. A fiber SPR sensing head comprising:
a tapered optical fiber;
the gold film is plated on the outer surface of the tapered optical fiber; and
and the barium titanate film is plated on the surface of the gold film.
2. The fiber SPR sensing head of claim 1, wherein:
the length of toper optic fibre is 34um, and the diameter of toper pointed end bottom is 1.5 um.
3. The fiber SPR sensing head of claim 1, wherein:
wherein the thickness of the gold film is 50 nm.
4. The fiber SPR sensing head of claim 1, wherein:
wherein the thickness of the barium titanate film is 40 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010214364.5A CN111272706A (en) | 2020-03-24 | 2020-03-24 | Optical fiber SPR sensing head |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010214364.5A CN111272706A (en) | 2020-03-24 | 2020-03-24 | Optical fiber SPR sensing head |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103868887A (en) * | 2014-03-11 | 2014-06-18 | 中国科学院重庆绿色智能技术研究院 | Graphene film-based tapered optical fiber sensor |
| CN107255633A (en) * | 2017-05-03 | 2017-10-17 | 上海大学 | The polymerization phenyl boric acid film conical fiber saccharide sensor device and its manufacture method resonated based on metal surface plasma |
| CN109540179A (en) * | 2018-12-21 | 2019-03-29 | 南京信息工程大学 | Optical fiber taper sensing probe based on surface plasma body resonant vibration and preparation method thereof |
| CN110220870A (en) * | 2019-07-26 | 2019-09-10 | 东北大学 | A kind of thin film optical filters spr sensor based on barium titanate |
-
2020
- 2020-03-24 CN CN202010214364.5A patent/CN111272706A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103868887A (en) * | 2014-03-11 | 2014-06-18 | 中国科学院重庆绿色智能技术研究院 | Graphene film-based tapered optical fiber sensor |
| CN107255633A (en) * | 2017-05-03 | 2017-10-17 | 上海大学 | The polymerization phenyl boric acid film conical fiber saccharide sensor device and its manufacture method resonated based on metal surface plasma |
| CN109540179A (en) * | 2018-12-21 | 2019-03-29 | 南京信息工程大学 | Optical fiber taper sensing probe based on surface plasma body resonant vibration and preparation method thereof |
| CN110220870A (en) * | 2019-07-26 | 2019-09-10 | 东北大学 | A kind of thin film optical filters spr sensor based on barium titanate |
Non-Patent Citations (1)
| Title |
|---|
| ZHANGCONG XIA等: "Study of Surface Plasmon Resonance Sensor，Based on Polymer-Tipped Optical Fiber With Barium Titanate Layer", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 * |
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Application publication date: 20200612 |