CN109358038B - Microstructure optical fiber surface plasma resonance multifunctional sensor and preparation method thereof - Google Patents
Microstructure optical fiber surface plasma resonance multifunctional sensor and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an optical fiber sensor, in particular to a microstructure optical fiber surface plasma resonance multifunctional sensor and a preparation method thereof, wherein fan-shaped openings are arranged on two sides of a photonic crystal optical fiber substrate of an optical fiber, gold films are plated on the surfaces of the fan-shaped openings, and silver nanowires are arranged at the tip ends of the bottom ends of the fan-shaped openings; the magnetic fluid is arranged in the fiber core of the photonic crystal fiber substrate, and the cladding air hole is arranged on the outer side of the fiber core. The preparation method comprises the following steps: polishing the photonic crystal fiber to form a fan-shaped opening; filling silver nanowires; uniformly plating a gold film on the surface of the fan-shaped opening; the magnetic fluid is pressed into the photonic crystal fiber from a small tube; and coupling and welding the two ends of the common single-mode optical fiber and the photonic crystal optical fiber by adopting the self-calibration function of the optical fiber welding machine. The device can simultaneously analyze and detect the external magnetic field intensity, the refractive index of the liquid to be detected and the external temperature at one time, thereby overcoming the defects of the traditional detection technology, such as complex operation, low detection sensitivity, real-time online detection incapability and the like.
Description
The technical field is as follows:
the invention relates to an optical fiber sensor, in particular to a microstructure optical fiber surface plasma resonance multifunctional sensor and a preparation method thereof.
Background art:
with the gradual maturity of the optical fiber sensing technology, the development of the practicability of the optical fiber sensor becomes a hotspot and a key of the development of the whole field. Compared with the traditional sensor, the optical fiber sensor has many incomparable advantages, including electromagnetic interference resistance, chemical corrosion resistance, small volume, long-distance measurement capability, large-capacity multiplexing capability, distributed quasi-distributed sensing capability and the like. However, the conventional optical fiber sensor mainly adopts a conventional optical fiber as a sensing element, and has the disadvantages of large coupling loss, poor polarization retention, easy cross-sensitivity, and the like. In order to improve the sensing detection sensitivity of the photonic crystal fiber sensor, a surface plasmon resonance technology is introduced in the research of the photonic crystal fiber sensor, not only new activity is injected, but also the development of the photonic crystal fiber sensor is greatly promoted.
The surface plasma resonance technology based on the photonic crystal fiber is closely concerned by scientific researchers because the refractive index of the fiber core can be flexibly designed and regulated, and the surface plasma resonance technology is easy to realize phase matching with a surface plasma body model to excite the SPR phenomenon. The literature (Optics & Laser Technology,2012,44(4): 899-. Patent CN105371981A provides an inner wall silvering liquid crystal filling hollow optical fiber surface plasma resonance temperature sensor, and the inside silvering of hollow glass optic fibre is filled with the liquid crystal at the inside silvering hollow glass optic fibre, can realize real-time dynamic monitoring tiny temperature change, is fit for long distance transmission. Patent CN102353655A proposes a sensor based on photonic crystal fiber surface plasmon resonance, in which metal nanoparticles or nano-films are deposited on the inner wall of air holes near the fiber core in the photonic crystal fiber, and the cladding air holes are directly used as microfluidic channels. When the microfluid flows through the coated cladding air hole, the change of the refractive index value of different substances can cause the change of the transmission loss peak, and the refractive index of different substances can be detected in real time in the process. Patent CN105974515A provides a photonic crystal fiber surface plasmon resonance biosensor filled with gold wires, which combines the surface plasmon resonance technology with the photonic crystal fiber, the detection range of the refractive index of the liquid sample to be detected is wider than 1.37-1.44, the structure is simple, the operation is easy, and the biosensor has a great application prospect in the sensing field.
In the research, the photonic crystal fiber surface plasmon resonance sensor only completes detection of a single physical quantity, and can only detect one property at a time, which limits the application of the sensor to a certain extent.
The invention content is as follows:
one of the objectives of the present invention is to provide a micro-structure fiber surface plasmon resonance multifunctional sensor which has a small volume and high measurement accuracy, and can simultaneously detect the external magnetic field strength, the solution to be measured and the external temperature; the other purpose is to provide a preparation method of the microstructure optical fiber surface plasma resonance multifunctional sensor with reasonable process and convenient operation.
The technical scheme adopted by the invention is as follows: a multifunctional sensor for the surface plasma resonance of a microstructure optical fiber is characterized in that fan-shaped openings are formed in two sides of a photonic crystal optical fiber substrate of the optical fiber sensor, a gold film is plated on the surfaces of the fan-shaped openings, and silver nanowires are arranged at the tip ends of the bottom ends of the fan-shaped openings; and a magnetic fluid is arranged in the fiber core of the photonic crystal fiber substrate, and a cladding air hole is arranged on the outer side of the fiber core.
Further, the cladding air holes are arranged in a regular hexagonal lattice.
Further, the cladding air holes are 3 layers.
Further, the diameter of each cladding air hole is 0.5 μm, and the distance between every two adjacent cladding air holes is 2 μm.
Further, the thickness of the gold film is 30-50 nm.
Further, the thickness of the gold film is 40 nm.
Further, the diameter of the silver nanowire is 50-70 nm.
Further, the diameter of the silver nanowire is 60 nm.
Further, the magnetic fluid had a density of 1.8g/cc and a saturation magnetization of 220 Gauss.
A method for preparing a microstructure optical fiber surface plasma resonance multifunctional sensor comprises the following steps:
the method comprises the following steps: taking a hollow photonic crystal fiber, removing a coating layer on the outer side of the hollow photonic crystal fiber, and cutting and flattening the end surfaces of the two optical fibers by using an optical fiber cutter;
step two: polishing and grinding the photonic crystal fiber processed in the first step by using a fiber side arc-shaped groove base block polishing and grinding method, fixing the fiber on a glass base block with an arc-shaped groove formed on the glass base block by using glue, fixing the fiber by using epoxy glue, grinding the fiber by using an optical polishing and grinding machine, polishing and grinding the two sides of the photonic crystal fiber base to form a fan-shaped opening, and dissolving epoxy glue for fixing by using epoxy glue dissolving liquid after polishing and grinding are finished, thereby taking out the polished photonic crystal fiber;
step three: filling the silver nanowires by adopting a method of extracting and injecting by using an injector, firstly evacuating air in the injector, extracting an aqueous solution containing the silver nanowires, then bonding the photonic crystal fiber substrate in the second step with the injector by using glue, injecting the aqueous solution to the tip of the fan-shaped opening to precipitate the aqueous solution of the silver nanowires at the tip, and putting the aqueous solution into a drying box for drying;
step four: the method comprises the steps of uniformly plating a gold film on the surface of a fan-shaped opening by using a TRI-S500 optical fiber material metal coating film forming system, firstly, vacuumizing a film plating cavity by using a vacuum pump to ensure that the vacuum degree reaches 10-3Pa; secondly, filling Ar gas into the coating cavity, controlling the vacuum degree to be 5Pa, adding a voltage of 0.8k V between two ends of two electrodes to ionize Ar, bombarding the gold target by ionized particles, and enabling gold atoms to be adsorbed on the surface of the optical fiber after being separated from the silver target; the fixed optical fiber rotates around the shaft at a constant speed to ensure that the gold atoms are uniformly plated on the lightThe thickness of the gold film is determined by controlling the film coating time on the surface of the fiber, and the silver nanowires are accumulated at the port of the photonic crystal fiber;
step five: pressing the magnetic fluid into the photonic crystal fiber in the fourth step from a small tube through a micro-flow pump, continuously pressing until the micro-fluid flows out from the other end of the photonic crystal fiber, and sealing the two ends of the photonic crystal fiber by paraffin to ensure the isolation of the internal environment from the outside;
step six: and D, coupling and welding the common single-mode optical fiber and the two ends of the photonic crystal optical fiber in the step five by adopting the self-calibration function of the optical fiber welding machine to manufacture the microstructure optical fiber surface plasma resonance multifunctional sensor, namely the multifunctional sensor based on the photonic crystal optical fiber surface plasma resonance effect is obtained.
The invention has the beneficial effects that: the micro-structure optical fiber surface plasma resonance multifunctional sensor has small volume and high measurement precision, and can simultaneously detect the external magnetic field intensity, the solution to be detected and the external temperature; and provides a preparation method of the microstructure fiber surface plasma resonance multifunctional sensor with reasonable process and convenient operation.
The TRI-S500 optical fiber material metal coating film forming system is adopted to realize the open plane gold-plated film technology of the double-side open film-coated photonic crystal fiber, and the response of the gold film, the silver nanowire and the magnetic fluid to the external magnetic field intensity, the refractive index of the liquid to be measured and the external temperature is realized by regulating and controlling the external magnetic field intensity, the refractive index of the liquid to be measured and the external temperature, so that the quick response of the surface plasma resonance signal is realized, and the measurement sensitivity and stability are improved. The device can simultaneously analyze and detect the external magnetic field intensity, the refractive index of the liquid to be detected and the external temperature at one time, thereby overcoming the defects of the traditional detection technology, such as complex operation, low detection sensitivity, real-time online detection incapability and the like.
The magnetic fluid is filled in the fiber core of the double-side opening coated photonic crystal fiber, the detection of various information such as the environment to be detected, the magnetic field of an object, the temperature and the like can be indirectly realized by measuring the magneto-optical effect of the magnetic fluid, and the magnetic fluid is used as a sensitive material in a magneto-optical sensor, has the characteristic of controllable refractive index and unique magneto-optical effect under the action of an external magnetic field, and also has better temperature-sensitive characteristic when the external temperature changes, thereby having good sensing characteristic.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the first embodiment;
FIG. 2 is a schematic view showing measurement of refractive index of a liquid to be measured in the third embodiment;
FIG. 3 is a schematic view of a multifunctional sensor-based sensing and measuring device in a third embodiment;
FIG. 4 is a graph showing the variation of the transmission loss of the multifunctional sensor with the external magnetic field in the third embodiment;
FIG. 5 is a graph showing the transmission loss of the multifunctional sensor according to the third embodiment as a function of the external solution to be measured;
fig. 6 is a graph of the transmission loss of the multifunctional sensor according to the third embodiment as a function of the external temperature.
The specific implementation mode is as follows:
example one
Referring to fig. 1, fan-shaped openings 13 are arranged on two sides of a photonic crystal fiber substrate 12 of the optical fiber sensor, a gold film 10 is plated on the surface of each fan-shaped opening 13, the gold film 10 is deposited on the plane of each fan-shaped opening 13 by a magnetron sputtering method, the thickness of the prepared gold film is 30-50 nm, and the gold film 10 is used as a temperature sensing detection layer for surface plasmon resonance because the position of an absorption peak of a spectrum at the emergent end of an optical fiber can be changed by the temperature change of the gold film 10; the silver nanowire 9 is arranged at the tip of the bottom end of the fan-shaped opening 13 and used for enhancing the surface plasma resonance effect and improving the sensitivity of the sensor; a magnetic fluid 14 is arranged in a fiber core 8 of the photonic crystal fiber substrate 12, and a cladding air hole 11 is arranged on the outer side of the fiber core 8; the cladding air holes 11 are arranged in a regular hexagonal lattice; the cladding air holes 11 are 3 layers; the diameter of each cladding air hole is 0.5 mu m, and the distance between every two adjacent cladding air holes 11 is 2 mu m; the thickness of the gold film 10 is preferably 4 nm; the diameter of the silver nanowire is 50-70 nm, the diameter of the silver nanowire is preferably 60nm, a local surface plasma resonance effect is generated, and the silver nanowire is extremely sensitive to small change of the refractive index of an external solution to be detected, so that the change of the refractive index of the external solution to be detected can be detected; the density of the magnetic fluid 14 is 1.8g/cc, the saturation magnetization of the magnetic fluid is 220Gauss, the diameter of a magnetic fluid channel is 1 mu m, the magnetic fluid is more sensitive to an external temperature magnetic field, the sensing characteristic of the magnetic fluid is enhanced, the detection of various information such as the magnetic field, the temperature and the like of an environment to be detected and an object can be indirectly realized by measuring the magneto-optical effect of the magnetic fluid, and the magnetic fluid is used as a sensitive material in a magneto-optical sensor, has the characteristic of controllable refractive index and unique magneto-optical effect under the action of an external magnetic field, and has better temperature-sensitive characteristic when the external temperature changes, so the magnetic fluid has good sensing characteristic; the refractive index of the magnetic fluid filled in the fiber core changes along with the changes of the external magnetic field intensity and the temperature, and the relationship between the refractive index of the magnetic fluid and the temperature and the external magnetic field can be described by a langevin function; the refractive index of air is 1, and the background material of the photonic crystal fiber is quartz glass.
Example two
A method for preparing a microstructure optical fiber surface plasma resonance multifunctional sensor comprises the following steps:
the method comprises the following steps: taking a hollow photonic crystal fiber, removing a coating layer on the outer side of the hollow photonic crystal fiber, and cutting and flattening the end surfaces of the two optical fibers by using an optical fiber cutter;
step two: polishing and grinding the photonic crystal fiber processed in the first step by using a fiber side arc-shaped groove base block polishing and grinding method, fixing the fiber on a glass base block with an arc-shaped groove formed on the glass base block by using glue, fixing the fiber by using epoxy glue, grinding the fiber by using an optical polishing and grinding machine, polishing and grinding the two sides of the photonic crystal fiber base to form a fan-shaped opening, and dissolving epoxy glue for fixing by using epoxy glue dissolving liquid after polishing and grinding are finished, thereby taking out the polished photonic crystal fiber;
step three: filling the silver nanowires by adopting a method of extracting and injecting by using an injector, firstly evacuating air in the injector, extracting an aqueous solution containing the silver nanowires, then bonding the photonic crystal fiber substrate in the second step with the injector by using glue, injecting the aqueous solution to the tip of the fan-shaped opening to precipitate the aqueous solution of the silver nanowires at the tip, and putting the aqueous solution into a drying box for drying;
step four: the method comprises the steps of uniformly plating a gold film on the surface of a fan-shaped opening by using a TRI-S500 optical fiber material metal coating film forming system, firstly, vacuumizing a film plating cavity by using a vacuum pump to ensure that the vacuum degree reaches 10-3Pa; secondly, filling Ar gas into the coating cavity, controlling the vacuum degree to be 5Pa, adding a voltage of 0.8k V between two ends of two electrodes to ionize Ar, bombarding the gold target by ionized particles, and enabling gold atoms to be adsorbed on the surface of the optical fiber after being separated from the silver target; the fixed optical fiber rotates around a shaft at a constant speed, gold atoms are uniformly plated on the surface of the optical fiber, the thickness of a gold film is determined by controlling the film plating time, and silver nanowires are accumulated at the port of the photonic crystal optical fiber;
step five: pressing the magnetic fluid into the photonic crystal fiber in the fourth step from a small tube through a micro-flow pump, continuously pressing until the micro-fluid flows out from the other end of the photonic crystal fiber, and sealing the two ends of the photonic crystal fiber by paraffin to ensure the isolation of the internal environment from the outside;
step six: and D, coupling and welding the common single-mode optical fiber and the two ends of the photonic crystal optical fiber in the step five by adopting the self-calibration function of the optical fiber welding machine to manufacture the microstructure optical fiber surface plasma resonance multifunctional sensor, namely the multifunctional sensor based on the photonic crystal optical fiber surface plasma resonance effect is obtained.
EXAMPLE III
Referring to fig. 2-6, a measurement method using a microstructure fiber surface plasmon resonance multifunctional sensor, the measurement method comprising: the measuring equipment mainly comprises a wide-spectrum light source 1, a polarizer 2, a polarization controller 3, a microstructure fiber surface plasma resonance multifunctional sensor 4, a spectrometer 5 and a computer 6; the wide-spectrum light source 1 is connected with a common single-mode fiber at one end of a microstructure fiber surface plasma resonance multifunctional sensor 4 through a fiber connector, the common single-mode fiber is communicated with a polarizer 2 and a polarization controller 3, the polarization controller 3 is adjusted to obtain required polarized light, the common single-mode fiber at the other end of the polarization controller enters a spectrometer 5, and the spectrometer 5 is connected with a computer 6;
1. the method comprises the steps that a supercontinuum fiber laser with a spectrum range covering 400-2400 nm and changing continuously is used, linearly polarized light is formed through a polarizer 2, polarized light in any polarization state can be obtained through a polarization controller 3, and then data analysis is carried out on an output spectrum through a spectrometer 5 and a computer 6 through a common single-mode fiber coupled with two ends of a microstructure fiber surface plasma resonance multifunctional sensor 4;
2. connecting the single-mode optical fiber to a spectrometer 5, and adjusting the detection wavelength range of the spectrometer 5 to 400-2400 nm; when the external temperature is not changed, the pressure of the mixed thermosensitive liquid injection section in the micro-structure optical fiber surface plasma resonance multifunctional sensor 4 is controlled through a magnetic field intensity control device, when the external magnetic field intensity is different through measurement of a spectrometer 5, the transmission loss spectrum of the micro-structure optical fiber surface plasma resonance multifunctional sensor 4 is used as an external magnetic field detection reference spectrum, the transmission loss of the micro-structure optical fiber surface plasma resonance multifunctional sensor 4 is a curve graph of the change of the external magnetic field intensity, the loss peak intensity is gradually increased along with the increase of the external magnetic field intensity, namely the excited surface plasma resonance intensity is gradually increased; this is because under the effect of the external magnetic field strength, more energy is transferred from the core guided mode to the plasma mode, thereby generating stronger coupling efficiency, so the resonance strength is gradually enhanced as the loss at the resonance peak is increased with the increase of the external magnetic field strength;
3. connecting the single-mode optical fiber to a spectrometer 6, and adjusting the detection wavelength range of the spectrometer 6 to 400-2400 nm; at normal temperature, when no magnetic field acts on the outside, the microstructure optical fiber surface plasma resonance multifunctional sensor 4 is respectively placed into solutions with refractive indexes ranging from 1.47 to 1.52, a spectrometer 5 is used for measuring to obtain a transmission loss spectrum of the microstructure optical fiber surface plasma resonance multifunctional sensor 4 under different solutions to be measured 7 as a reference spectrum, the transmission loss of the microstructure optical fiber surface plasma resonance multifunctional sensor 4 is along with a curve graph of the change of the refractive index of the liquid to be measured on the outer side, the loss peak intensity is gradually increased along with the increase of the refractive index of the liquid to be measured on the outer side, namely, the excited surface plasma resonance intensity is gradually increased;
4. and connecting the single-mode optical fiber to the spectrometer 5, and adjusting the detection wavelength range of the spectrometer 5 to be 400-2400 nm. When the outside has no magnetic field, the temperature of the microstructure fiber surface plasma resonance multifunctional sensor 4 is controlled by a temperature control device, a spectrometer 5 is used for measuring and obtaining a transmission loss spectrum of the double-side opening coated photonic crystal fiber at different temperatures as a temperature reference spectrum, the transmission loss of the microstructure fiber surface plasma resonance multifunctional sensor 4 is a curve graph of the change of the temperature, the loss peak intensity is gradually reduced along with the increase of the temperature, namely the resonance intensity of the excited surface plasma is gradually weakened; this is because the absorption loss of the metal is reduced in the short wavelength direction, and the mode field radius of the fundamental mode of the optical fiber is smaller in the short wavelength direction, and the energy of the optical field penetrating into the cladding is lower, so that the loss at the resonance peak is reduced with the increase of temperature, and the resonance strength is gradually weakened.
5. The microstructure fiber surface plasma resonance multifunctional sensor 4 is placed in a microfluidic channel, solutions with different refractive indexes are injected through a microfluidic pump, the microstructure fiber surface plasma resonance multifunctional sensor is placed on a magnetic field intensity and temperature control device, a spectrometer is used for collecting the spectrum, only one absorption peak exists in the spectrum measured in the spectrometer 5, however, if the external magnetic field intensity, the solution to be measured and the external temperature change, a plurality of absorption peaks can be detected in the spectrometer 5, under the condition that a plurality of absorption peaks are observed, a light source near the corresponding resonance wavelength is used as an incident light source, and the position where surface plasma resonance occurs is measured by using a loss spectroscopy analysis method;
6. through the calibration curve of the sensing and measuring device, the measured external magnetic field intensity, the solution to be measured and the external temperature can be obtained through the resonance wavelength;
7. the sensitivity of the sensing measurement device can be obtained by analyzing the spectrum analysis diagram and combining the corresponding formula.
The sensing test device based on the microstructure optical fiber surface plasma resonance multifunctional sensor has the detection range of the magnetic field intensity at the outer side of the sensing test device to be 0-271Oe, the detection range of the refractive index of the biological liquid to be tested at the outer side of the sensing test device to be 1.47-1.52 and the detection range of the external temperature to be 10-60 ℃; by regulating and controlling the external magnetic field intensity, the refractive index of the liquid to be measured and the change of the external temperature, the response of the gold film, the silver nanowire and the magnetic fluid to the external magnetic field intensity, the refractive index of the liquid to be measured and the external temperature is realized, so that the quick response of the surface plasma resonance signal is realized, and the measurement sensitivity and stability are improved. The method can realize the analysis and detection of the external magnetic field intensity, the refractive index of the liquid to be detected and the external temperature at one time, thereby overcoming the defects of the traditional detection technology, such as complex operation, low detection sensitivity, real-time on-line detection of multiple physical quantities and the like.
Claims (10)
1. A multifunctional sensor with micro-structure fiber surface plasmon resonance is characterized in that: fan-shaped openings (13) are arranged on two sides of a photonic crystal fiber substrate (12) of the optical fiber sensor, a gold film (10) is plated on the surfaces of the fan-shaped openings (13), and silver nanowires (9) are arranged at the tip ends of the bottom ends of the fan-shaped openings (13); a magnetic fluid (14) is arranged in a fiber core (8) of the photonic crystal fiber substrate (12), and a cladding air hole (11) is arranged on the outer side of the fiber core (8).
2. The multifunctional sensor of claim 1, wherein: the cladding air holes (11) are arranged in a regular hexagonal lattice.
3. The multifunctional sensor of claim 2, wherein: the cladding air holes (11) are 3 layers.
4. The multifunctional sensor of claim 2 or 3, wherein: the diameter of each cladding air hole is 0.5 mu m, and the distance between every two adjacent cladding air holes (11) is 2 mu m.
5. The multifunctional sensor of any one of claims 1 to 3, wherein: the thickness of the gold film (10) is 30-50 nm.
6. The multifunctional sensor of claim 5, wherein: the thickness of the gold film (10) is 40 nm.
7. The multifunctional sensor of any one of claims 1 to 3, wherein: the diameter of the silver nanowire (9) is 50-70 nm.
8. The multifunctional sensor of claim 7, wherein: the diameter of the silver nanowire (9) is 60 nm.
9. The multifunctional sensor of any one of claims 1 to 3, wherein: the magnetic fluid (14) has a density of 1.8g/cc and a saturation magnetization of 220 Gauss.
10. The method for preparing the microstructure optical fiber surface plasmon resonance multifunctional sensor according to claim 1 is characterized in that: the preparation method comprises the following steps:
the method comprises the following steps: taking a hollow photonic crystal fiber, removing a coating layer on the outer side of the hollow photonic crystal fiber, and cutting and flattening the end surfaces of the two optical fibers by using an optical fiber cutter;
step two: polishing and grinding the photonic crystal fiber processed in the first step by using a fiber side arc-shaped groove base block polishing and grinding method, fixing the fiber on a glass base block with an arc-shaped groove formed on the glass base block by using glue, fixing the fiber by using epoxy glue, grinding the fiber by using an optical polishing and grinding machine, polishing and grinding the two sides of the photonic crystal fiber base to form a fan-shaped opening, and dissolving epoxy glue for fixing by using epoxy glue dissolving liquid after polishing and grinding are finished, thereby taking out the polished photonic crystal fiber;
step three: filling the silver nanowires by adopting a method of extracting and injecting by using an injector, firstly evacuating air in the injector, extracting an aqueous solution containing the silver nanowires, then bonding the photonic crystal fiber substrate in the second step with the injector by using glue, injecting the aqueous solution to the tip of the fan-shaped opening to precipitate the aqueous solution of the silver nanowires at the tip, and putting the aqueous solution into a drying box for drying;
step four: the method comprises the steps of uniformly plating a gold film on the surface of a fan-shaped opening by using a TRI-S500 optical fiber material metal coating film forming system, firstly, vacuumizing a film plating cavity by using a vacuum pump to ensure that the vacuum degree reaches 10-3Pa; secondly, filling Ar gas into the coating cavity, controlling the vacuum degree to be 5Pa, adding a voltage of 0.8k V between two ends of two electrodes to ionize Ar, bombarding the gold target by ionized particles, and enabling gold atoms to be adsorbed on the surface of the optical fiber after being separated from the silver target; the fixed optical fiber rotates around the shaft at a constant speed, so that gold atoms are uniformly plated on the surface of the optical fiber, and the thickness of a gold film is determined by controlling the plating time;
step five: pressing the magnetic fluid into the photonic crystal fiber in the fourth step from a small tube through a micro-flow pump, continuously pressing until the micro-fluid flows out from the other end of the photonic crystal fiber, and sealing the two ends of the photonic crystal fiber by paraffin to ensure the isolation of the internal environment from the outside;
step six: and D, coupling and welding the common single-mode optical fiber and the two ends of the photonic crystal optical fiber in the step five by adopting the self-calibration function of the optical fiber welding machine to manufacture the microstructure optical fiber surface plasma resonance multifunctional sensor.
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