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WO2019000369A1 - Capteur d'indice de réfraction, procédé de fabrication associé et dispositif de mesure d'indice de réfraction - Google Patents

Capteur d'indice de réfraction, procédé de fabrication associé et dispositif de mesure d'indice de réfraction Download PDF

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Publication number
WO2019000369A1
WO2019000369A1 PCT/CN2017/091025 CN2017091025W WO2019000369A1 WO 2019000369 A1 WO2019000369 A1 WO 2019000369A1 CN 2017091025 W CN2017091025 W CN 2017091025W WO 2019000369 A1 WO2019000369 A1 WO 2019000369A1
Authority
WO
WIPO (PCT)
Prior art keywords
refractive index
probe
photonic crystal
crystal fiber
fiber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/091025
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English (en)
Chinese (zh)
Inventor
王义平
张峰
王英
廖常锐
何俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen University
Original Assignee
Shenzhen University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen University filed Critical Shenzhen University
Priority to PCT/CN2017/091025 priority Critical patent/WO2019000369A1/fr
Publication of WO2019000369A1 publication Critical patent/WO2019000369A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods

Definitions

  • the invention belongs to the technical field of optical fiber sensing, and in particular relates to a refractive index sensor, a preparation method thereof and a refractive index detecting device.
  • the existing sensors for measuring the refractive index of liquids are generally based on refractive index sensors made of ordinary optical fibers, and the sensitivity of such refractive index sensors based on ordinary optical fibers is generally low.
  • PCF photonic crystal fiber
  • SPR Surface Plasmon Resonance sensor
  • PCF photonic crystal fiber
  • SPR Surface Plasmon Resonance sensor
  • This SPR sensor based on photonic crystal fiber has high refractive index sensitivity, but most of the SPR sensors based on photonic crystal fiber are now available.
  • the invention provides a refractive index sensor, a preparation method thereof and a refractive index detecting device, and aims to provide a surface plasmon resonance sensor based on a photonic crystal fiber with simple structure, convenient use and high sensitivity.
  • the present invention provides a refractive index sensor comprising: a length of photonic crystal fiber and a probe embedded in a cladding air hole of the photonic crystal fiber;
  • the core of the photonic crystal fiber is a solid core, a cladding air hole embedded with a probe is adjacent to the core, the probe is a precious metal probe, and the probe includes a body and a probe, and the probe body In the case of a cylindrical structure, the probe has a conical structure, one of the sections of the body is embedded in the cladding air hole, and the other section of the body and the probe are exposed outside.
  • the number of the probes is one, and one of the probes is embedded in a cladding air hole of the photonic crystal fiber.
  • the noble metal probe is a gold probe or a silver probe.
  • a length of the body embedded in the air hole of the cladding is 0.5 cm - 2 cm
  • a length of the exposed body is 1 ⁇ m - 3 ⁇ m
  • the length of the probe is 0.5 ⁇ m - 2 ⁇ m.
  • the overall shape of the cladding air holes of the end face of the photonic crystal fiber is hexagonal.
  • the invention also provides a preparation method of the above refractive index sensor, which comprises:
  • the noble metal filled in the photonic crystal fiber is processed into a probe structure to form the refractive index sensor having a probe structure.
  • the selective aperture technology includes:
  • One end of the photonic crystal fiber is fused to the single mode fiber, and the single mode fiber is cut at a distance of 10 ⁇ m from the fusion point so that the remaining single mode fiber sheet seals all the cladding air holes of the photonic crystal fiber and The cladding air holes are visible, and any of the cladding air holes adjacent to the core of the photonic crystal fiber are selectively opened by femtosecond laser micromachining technology;
  • the filling of the noble metal into the cladding air hole selectively opened by the photonic crystal fiber comprises:
  • One end of the selective opening of the photonic crystal fiber is welded to one end of the glass tube, and a precious metal is placed in the glass tube; a high voltage is connected to the other end of the glass tube, and the glass with the precious metal placed thereon And the tube and the photonic crystal fiber to be filled are heated such that the high pressure presses the melted noble metal into the selectively open cladding air hole of the photonic crystal fiber;
  • the processing of the refractive index sensor of the probe structure by processing the noble metal filled in the photonic crystal fiber into a probe structure comprises:
  • the welded glass tube and the single-mode fiber sheet are cut off, and the noble metal-filled end of the photonic crystal fiber is chemically etched to expose a part of the cylindrical noble metal and exposed.
  • the tip of the cylindrical noble metal is ground and processed into a conical structure to form the probe.
  • the present invention also provides a refractive index detecting device comprising the above refractive index sensor.
  • the refractive index detecting device further includes a light source, a fiber optic spectrometer and a coupler, the first end of the coupler is connected to the light source, the second end is connected to the optical fiber spectrometer, the third end and the refraction Rate sensor connection.
  • the coupler and the refractive index sensor are connected by a multimode optical fiber;
  • the light source is a continuous broadband light source
  • the polarizer and the coupler further include a polarizer along the optical path direction and A polarization controller, the continuous broadband light source, a polarizer, a polarization controller, and a coupler are sequentially connected, and connected by a single mode fiber, and the fiber optic spectrometer and the coupler are connected by a single mode fiber.
  • the present invention provides a refractive index sensor, a preparation method thereof and a refractive index detecting device, wherein the refractive index sensor is a sensor structure of a probe structure, including a photon.
  • the crystal optical fiber and the precious metal probe embedded in the cladding air hole adjacent to the core of the photonic crystal fiber have the characteristics of small volume, simple structure and high integration; and the refractive index detecting device provided by the invention is used
  • the refractive index detecting device provided by the invention is used
  • the change of the refractive index of the liquid to be tested can be detected, which is convenient to use and has high sensitivity.
  • FIG. 1 is a schematic diagram of a refractive index sensor according to an embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing a cross-section of a cladding air hole in which an end face of a photonic crystal fiber filled with a noble metal is hexagonal;
  • FIG. 3 is a schematic diagram of a refractive index detecting apparatus according to an embodiment of the present invention.
  • the present invention provides a refractive index sensor, as shown in FIG. 1, the refractive index sensor includes: a segment of photonic crystal fiber 10 and a probe 11 embedded in a cladding air hole of the photonic crystal fiber; the photon
  • the crystal fiber 10 includes a core 101 and a plurality of cladding air holes 102, the core 101 being a solid core, and the cladding air hole in which the probe 11 is embedded is adjacent to the core 101, the probe 11 is a precious metal probe, the probe 11 includes a body and a probe, the body is a cylindrical structure, the probe has a conical structure, one section of the body is embedded in the cladding air hole, and another section of the body is And the probe is exposed outside.
  • the noble metal probe provided by the embodiment of the invention is a gold probe; in fact, the noble metal probe may also be a silver probe.
  • a length of the body embedded in the air hole of the cladding is 0.5 cm - 2 cm
  • a length of the exposed body is 1 ⁇ m - 3 ⁇ m
  • the length of the probe is 0.5 ⁇ m - 2 ⁇ m.
  • the cladding air hole of the end face of the photonic crystal fiber provided by the embodiment of the present invention is a hexagonal close-packed structure, and the core is located in the cladding air hole of the hexagonal close-packed structure. Center, as shown in FIG. 2; in fact, the photonic crystal fiber of the hexagonal close-packed air hole provided by the embodiment of the present invention can also be replaced by other arrangement of photonic crystal fiber, and the cladding air is provided.
  • the pore size of the pores as long as the precious metal is filled into the air holes to achieve surface plasmon resonance with the evanescent field generated by the optical signal transmitted in the core.
  • Step S1 selectively opening a cladding air hole at one end of a section of the photonic crystal fiber by using a selective opening technique, and blocking other cladding air holes;
  • the selective aperture technology comprises: welding one end of the photonic crystal fiber to the single mode fiber, and cutting the single mode fiber at a distance of about 10 ⁇ m from the fusion point by using a cutting technique assisted by a microscope, in order to use a single mode.
  • the fiber sheet seals all of the cladding air holes of the photonic crystal fiber, and the position of the cladding air holes can also be observed from the end face of the single mode fiber.
  • a cladding air hole adjacent to the core of the photonic crystal fiber is selectively opened by femtosecond laser micromachining to open a cladding air hole to be filled.
  • the embodiment of the present invention is a method for preparing the refractive index sensor by embedding a probe in a cladding air hole, and a cladding air hole that needs to be filled is provided by the embodiment of the present invention. Any one of the air holes adjacent to the core is embedded in the probe by filling gold in the cladding air hole.
  • Step S2 filling a cladding air hole selectively opened by the photonic crystal fiber with a noble metal
  • the filling method is adopted: one end of the selective opening of the photonic crystal fiber is welded to one end of the glass tube, and a gold wire is placed in the glass tube, and a high voltage is connected to the other end of the glass tube, and the gold wire is simultaneously.
  • the section in which the glass tube is placed and the portion of the heating that the photonic crystal fiber needs to fill, after being financialized, can be pressed into the selectively open cladding air holes of the photonic crystal fiber with high pressure.
  • the outer diameter of the glass tube is 125 ⁇ m, which is the same as the outer diameter of the photonic crystal fiber, the inner diameter is 75 ⁇ m; the diameter of the gold wire is 50 ⁇ m, the high pressure of the access is about 2 MPa, and the melting point of gold is 1064.18 degrees Celsius. At the time, it will heat up to 1100 degrees, which has exceeded the melting point of gold.
  • Step S3 processing the noble metal filled in the photonic crystal fiber into a probe structure to form the refractive index sensor having a probe structure;
  • the gold filling is cooled and solidified after entering, and becomes cylindrical.
  • the fused glass tube and the single-mode fiber sheet are then cut, and the gold-filled end of the photonic crystal fiber is chemically etched to expose a portion of the cylindrical gold, and the exposed cylindrical gold is exposed.
  • the tip is ground and processed into a conical structure to form the probe; one of the probes of the probe is embedded in the cladding air hole of the photonic crystal fiber, and the other segment and the probe are exposed outside.
  • the probe is not limited to being embedded by means of gold filling, and the probe may be embedded by filling silver.
  • a refractive index sensor provided by the present invention is a novel probe structure sensor device comprising a length of photonic crystal fiber and a precious metal probe embedded in a cladding air hole adjacent to the core of the photonic crystal fiber, Small size, simple structure, high integration, good stability, and easy to use, can be applied in the field of biochemistry.
  • the embodiment of the invention further provides a refractive index detecting device, as shown in FIG. 3, comprising a refractive index sensor 1, further comprising a light source 2, a fiber optic spectrometer 3 and a coupler 4, the first end of the coupler 4 The light source 1 is connected, the second end is connected to the optical fiber spectrometer 3, and the third end is connected to the refractive index sensor 1.
  • a refractive index detecting device as shown in FIG. 3, comprising a refractive index sensor 1, further comprising a light source 2, a fiber optic spectrometer 3 and a coupler 4, the first end of the coupler 4 The light source 1 is connected, the second end is connected to the optical fiber spectrometer 3, and the third end is connected to the refractive index sensor 1.
  • the coupler 4 and the refractive index sensor 1 are connected by a multimode optical fiber. More specifically, the refractive index sensor 1 and the coupler 4 are connected in such a manner that the photonic crystal fiber is not first provided. The gold-filled portion is cut away, and then the exposed end face is welded to one end of the multimode fiber, and the other end is connected to the coupler 4; the light source 2 is a continuous broadband light source, the continuous broadband light source and the coupling
  • the device 4 further includes a polarizer 5 and a polarization controller 6 along the optical path, the continuous broadband light source, the polarizer 5, the polarization controller 6 and the coupler 4 are sequentially connected, and are connected by a single mode fiber, The fiber optic spectrometer 3 and the coupler 4 are connected by a single mode fiber.
  • the coupler is a 1 ⁇ 2 fiber splitter. It should be noted that a 2 ⁇ 2 fiber splitter is provided in the drawings of the present invention. In fact, only a 1 ⁇ 2 fiber splitter is needed. Can meet the requirements.
  • the working principle of the refractive index detecting device is that the optical signal outputted by the light source 2 is conducted into the photonic crystal fiber structure probe through the multimode optical fiber, and the optical signal in the core is realized at a specific wavelength and the gold in the cladding air hole.
  • Surface plasmon resonance, resulting surface plasmon SPP, Surface Plasmon Polariton has a certain transmission characteristic in the micrometer range and is distributed to bare gold probes.
  • SPP Surface Plasmon Polariton
  • the refractive index detecting device of the present invention provides the refractive index detection of the liquid to be tested, it is only necessary to place the probe portion exposed to the outside of the refractive index sensor in the liquid environment to be tested, and to detect the light in the probe and the core.
  • the change of the resonance peak wavelength of the surface plasmon resonance generated by the signal can realize the detection of the refractive index of the liquid to be tested, and the sensing effect is high by using the gold surface plasmon; and the gold is filled into the photonic crystal fiber.
  • the probe device, the input light of the light source and the reflected signal light are transmitted through a photonic crystal fiber, which has less loss during transmission, has high transmission stability, and improves the probe in sensing detection.
  • the refractive index detecting device can detect the refractive index of the liquid by using the surface plasmon resonance of the probe, and can also detect the electromagnetic field environment, and place the exposed probe on the outside to be tested.
  • the surface plasmon resonance of the probe can also be used for detection.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un capteur d'indice de réfraction (1), comprenant : une fibre à cristal photonique et une sonde, incorporée dans un trou d'air de gainage de la fibre à cristal photonique. La fibre à cristal photonique comporte une âme solide et le trou d'air de gainage incorporé à la sonde est adjacent à l'âme. La sonde est une sonde en métal précieux et comprend une partie corps et une partie tête. La partie corps présente une structure cylindrique et la partie tête une structure conique. Une section de la partie corps est incorporée dans le trou d'air de gainage et l'autre section de la partie corps et la partie tête sont exposées à l'extérieur. Le capteur d'indice de réfraction (1) présente une structure simple, une utilisation pratique et une sensibilité élevée. L'invention concerne également un procédé de fabrication du capteur d'indice de réfraction et un dispositif de mesure d'indice de réfraction comprenant le capteur d'indice de réfraction. Le dispositif de mesure d'indice de réfraction permet la mesure d'un indice de réfraction d'un liquide à l'essai par mesure d'une variation de longueur d'onde de pics de résonance de résonance plasmonique superficielle, produite par des signaux optiques dans l'âme de fibre de la fibre à cristal photonique et de la sonde, ce qui donne une sensibilité supérieure.
PCT/CN2017/091025 2017-06-30 2017-06-30 Capteur d'indice de réfraction, procédé de fabrication associé et dispositif de mesure d'indice de réfraction Ceased WO2019000369A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/091025 WO2019000369A1 (fr) 2017-06-30 2017-06-30 Capteur d'indice de réfraction, procédé de fabrication associé et dispositif de mesure d'indice de réfraction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/091025 WO2019000369A1 (fr) 2017-06-30 2017-06-30 Capteur d'indice de réfraction, procédé de fabrication associé et dispositif de mesure d'indice de réfraction

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WO2019000369A1 true WO2019000369A1 (fr) 2019-01-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111307763A (zh) * 2020-04-29 2020-06-19 东北石油大学 中空双芯内外薄包层表面双侧镀膜pcf-spr探针
CN112433132A (zh) * 2020-11-19 2021-03-02 哈尔滨理工大学 判别gis内绝缘材料劣化程度的气敏光纤传感器及方法
CN114252168A (zh) * 2021-11-24 2022-03-29 济南涂抹信息科技有限公司 基于表面等离子体共振效应的光子晶体光纤传感器及应用

Citations (8)

* Cited by examiner, † Cited by third party
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US20090052849A1 (en) * 2007-08-22 2009-02-26 Gwangju Institute Of Science And Technology Optical fiber probe for side imaging and method of manufacturing the same
CN101813629B (zh) * 2010-04-29 2011-09-28 大连海事大学 一种光子晶体光纤化学/生物传感头及其制备方法
US8717654B2 (en) * 2009-05-15 2014-05-06 Koninklijke Philips N.V. Optical probe with feedback correction
CN105891155A (zh) * 2016-04-08 2016-08-24 山东大学 一种基于珐珀干涉的免标记光纤生物传感探针
CN105943055A (zh) * 2016-04-23 2016-09-21 上海大学 药物在体监测光纤传感探针
CN105973807A (zh) * 2016-06-01 2016-09-28 浙江工商大学 一种可用于检测气体、液体的光纤传感探头
CN106645026A (zh) * 2015-10-30 2017-05-10 华中科技大学 一种量子点光纤气体传感器及其制备方法
CN107219198A (zh) * 2017-06-30 2017-09-29 深圳大学 折射率传感器、其制备方法及折射率检测装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090052849A1 (en) * 2007-08-22 2009-02-26 Gwangju Institute Of Science And Technology Optical fiber probe for side imaging and method of manufacturing the same
US8717654B2 (en) * 2009-05-15 2014-05-06 Koninklijke Philips N.V. Optical probe with feedback correction
CN101813629B (zh) * 2010-04-29 2011-09-28 大连海事大学 一种光子晶体光纤化学/生物传感头及其制备方法
CN106645026A (zh) * 2015-10-30 2017-05-10 华中科技大学 一种量子点光纤气体传感器及其制备方法
CN105891155A (zh) * 2016-04-08 2016-08-24 山东大学 一种基于珐珀干涉的免标记光纤生物传感探针
CN105943055A (zh) * 2016-04-23 2016-09-21 上海大学 药物在体监测光纤传感探针
CN105973807A (zh) * 2016-06-01 2016-09-28 浙江工商大学 一种可用于检测气体、液体的光纤传感探头
CN107219198A (zh) * 2017-06-30 2017-09-29 深圳大学 折射率传感器、其制备方法及折射率检测装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111307763A (zh) * 2020-04-29 2020-06-19 东北石油大学 中空双芯内外薄包层表面双侧镀膜pcf-spr探针
CN112433132A (zh) * 2020-11-19 2021-03-02 哈尔滨理工大学 判别gis内绝缘材料劣化程度的气敏光纤传感器及方法
CN112433132B (zh) * 2020-11-19 2022-07-01 哈尔滨理工大学 一种判别gis内绝缘材料劣化程度的气敏光纤传感器
CN114252168A (zh) * 2021-11-24 2022-03-29 济南涂抹信息科技有限公司 基于表面等离子体共振效应的光子晶体光纤传感器及应用

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