CN109298481B - The metallic silver filling photonic crystal fiber and its preparation method of spontaneous generation SPR effect - Google Patents

Abstract

The invention relates to a silver-filled photonic crystal optical fiber spontaneously generating SPR effect and a manufacturing method thereof, belonging to the technical field of optical fiber intelligent communication. The optical fiber comprises a core and a cladding, the core is a solid silica glass rod, and the cladding includes a silica glass capillary, air holes and silver wires, the longitudinal periphery of the core is provided with multi-layer silica glass capillaries, and the second layer In the quartz glass capillary, the air hole of one of the quartz glass capillary is provided with a silver wire. The preparation method is as follows: designing the structure, arranging the structure and drawing the optical fiber, and the prepared optical fiber can spontaneously generate the SPR effect. This method can produce photonic crystal fibers with different air hole structures and sizes that spontaneously generate the SPR effect, without subsequent coating or filling of the optical fiber, and by adjusting the diameter of the air hole, the diameter of the filled silver wire, and the outer diameter of the capillary, the resonance peak can be made The position is adjustable, the performance is good, and it also has the advantages of simple structure, convenient preparation, adjustable, etc., and can be applied to the production of various optical elements.

Description

Metal silver filled photonic crystal fiber with spontaneous SPR effect and its preparation method

technical field

The invention belongs to the technical field of optical fiber intelligent communication, relates to the manufacture of optical fiber devices, in particular to a metallic silver-filled photonic crystal optical fiber with SPR effect spontaneously generated and a manufacturing method thereof.

Background technique

In 1996, after Knight, J.C. and others successfully drew the first refractive index-guided photonic crystal fiber, photonic crystal fiber entered the field of vision of many researchers, aroused great enthusiasm for research, and brought new technologies to the field of scientific research. direction of development. Compared with traditional optical fibers, the structural design of photonic crystal fibers is more flexible, and can produce many "singular" characteristics, such as unlimited single-mode transmission, low loss, controllable dispersion, nonlinear characteristics, high birefringence characteristics, etc. , so photonic crystal fiber has received great attention, making it widely used in the field of communication, sensing and detection, and the preparation of optical devices.

Surface plasmon resonance (Surface Plasmon Resonance, SPR) is a resonance phenomenon produced by the excitation of metal surface plasmon sources. As early as 1968, Otto and Krechman each reported a method of exciting a surface plasmon source using a glass prism visible light coupler. This convenient structure has attracted extensive attention, and the principle of SPR was used in the design of biosensors in the early days. With the deepening of research, more and more scholars have combined the SPR principle with the fiber structure, and the application has become more and more extensive, not only in the field of sensing, but also in the design of optical devices such as filters and beam splitters. applied. In 2018, Yong Wang et al. coated a layer of silver film tens of nanometers thick on the surface of a commercial photonic crystal fiber, and used PDMS material to realize temperature sensing. This method requires another modification on the surface of the fiber to generate the SPR effect. In 2007, Alireza Hassani designed a photonic crystal fiber structure, combined with the SPR effect to propose a new type of sensor, and theoretically analyzed the performance of the sensor. Although the sensor performed well, the fiber had not yet been fabricated. Not only has it been applied in the field of sensing, in 2016, Guowen An et al. designed a fiber filter by combining the principle of photonic crystal fiber and SPR.

It can be seen that the combination of photonic crystal fiber and SPR principle has a wide range of applications, and has a good application prospect.

Contents of the invention

The technical problem to be solved by the present invention is: aiming at the deficiencies of the prior art, avoiding the complex metal film manufacturing process, providing a metal silver-filled photonic crystal fiber and its manufacturing method that spontaneously generates the SPR effect, and the fiber can spontaneously generate the SPR effect. The method of the present invention can accurately produce photonic crystal fibers with different air hole structures and sizes that spontaneously generate the SPR effect. The outer diameter of the glass capillary can make the position of the resonance peak adjustable, and has good performance. It also has the advantages of simple structure, convenient preparation, and adjustment. It can be applied to the production of optical components such as sensors, filters, polarizers, and beam splitters.

The technical solution adopted by the present invention to solve the problems of the technologies described above is:

A metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect is an optical fiber cladding structure, specifically comprising a core and a cladding, the core being a solid silica glass rod, the cladding comprising a silica glass capillary, air Holes and silver wires, air holes are divided into three types:

The first type: the pores of the quartz glass capillary;

The second type: the gap between the quartz glass capillary tubes;

The third type: the gap between the quartz glass capillary and the solid quartz glass rod;

There are multiple layers of quartz glass capillary tubes arranged around the longitudinal periphery of the fiber core, and in the second layer of quartz glass capillary tubes, a silver wire is arranged in the pores of one of the quartz glass capillary tubes.

The air hole can make the effective refractive index of the cladding lower than that of the fiber core, so as to ensure the propagation of light in the fiber core.

The silver wire is arranged in the air hole of the quartz glass capillary, and the silver wire can make the optical fiber form the SPR effect.

In the metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect, the cladding also includes a quartz glass outer sleeve and a solid quartz glass filling wire, and the core that is provided with a multilayer quartz glass capillary is inserted into the quartz glass In the outer sleeve, the gap between the outermost quartz glass capillary and the outer sleeve is filled with solid quartz glass filling wire.

The quartz transparent capillaries are distributed in a hexagonal shape around the longitudinal direction of the fiber core, that is, from the inside of the fiber core to the outside, there are 6 quartz transparent capillaries in the first layer, 12 quartz transparent capillaries in the second layer, and 12 quartz transparent capillaries in the third layer. There are 18 transparent capillaries, ..., and there are 6n quartz transparent capillaries in the nth layer.

The diameter of the metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect is 120-200 microns; the diameter of the solid quartz glass rod is 7-20 microns, preferably 10-15 microns, and the quartz glass capillary The diameter of the pore is 7-20 microns, preferably 10-15 microns; the pore diameter of the air hole formed by the pores of the quartz glass capillary is 4-6 microns; the pore diameter of the quartz glass capillary filled with silver wire is 6-7 microns.

The metallic silver-filled photonic crystal optical fiber that spontaneously produces the SPR effect, its solid quartz glass filling filaments are solid quartz glass filling filaments of different diameters. Photonic crystal fibers leave no gaps.

The preparation method of the metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect of the present invention comprises the following steps:

Step 1: Design the metal silver-filled photonic crystal fiber structure that spontaneously generates the SPR effect according to actual needs, and use simulation software to theoretically simulate the transmission performance of the metal silver-filled photonic crystal fiber that spontaneously generates the SPR effect, and obtain the proposed spontaneous generation Spectrum of metallic silver filled photonic crystal fiber with SPR effect;

Step 2: According to the designed structure of the metallic silver-filled photonic crystal fiber that can spontaneously generate the SPR effect and meet the requirements, make a solid quartz glass rod, a quartz glass capillary, and multiple solid quartz glass filling wires. After screening and cleaning, insert the silver wire into the In the stomata of one of the quartz glass capillary tubes; wherein, the outer diameters of the solid quartz glass rod and the quartz glass capillary tube are equal;

A solid quartz glass rod is used as the core, and multilayer quartz glass capillaries are arranged layer by layer from the longitudinal periphery of the fiber core, and the quartz glass capillaries inserted with silver wires are placed on the second layer, and the quartz capillaries arranged in each layer are arranged in a hexagonal shape , each layer is fixed after being set, and after the setting is completed, the core with the quartz glass capillary is placed in the quartz glass outer sleeve, and the gap between the quartz glass capillary and the quartz glass outer sleeve is filled with solid quartz glass filaments of different diameters Filling to obtain an optical fiber preform;

Step 3: Use the fixing device of the drawing tower to fix the optical fiber preform, and put one end of the optical fiber preform into the graphite furnace with openings at both ends. The lowest end face of the optical fiber preform is lower than the highest temperature point in the graphite furnace, and the graphite furnace is heated until the optical fiber preform is softened;

The lowest end fabric head of the optical fiber preform falls, and the optical fiber preform is thinned. Control the auxiliary pulley of the drawing tower to achieve continuous drawing. By adjusting the heating temperature, pulling speed and rod feeding speed, the size of the drawing is controlled to obtain spontaneous production. Metallic silver filled photonic crystal fiber for SPR effect.

In the step 2, the refractive index of the fiber core is 1.45, and the diameter of the fiber core is 1-2 mm.

In the step 2, the diameter of the quartz glass capillary is 1-2 mm, which is equal to the diameter of the fiber core, and the diameter of the pores of the quartz glass capillary is 0.325-0.65 mm.

In the step 2, the pore diameter of the quartz glass capillary is designed according to actual needs. Different sizes result in different transmission properties of optical fibers and different positions of absorption peaks of the SPR effect. The preferred inner diameter is 0.325-0.65 mm.

In step 2, the pore diameter of the quartz glass capillary provided with the silver wire is designed according to actual needs. Different sizes result in different transmission properties of the optical fiber and different positions of the absorption peaks of the SPR effect.

In the described step 2, the diameter of the silver wire<the pore diameter of the quartz glass capillary, this is because, compared with air, the viscosity and surface tension of the molten silver are larger, and its purpose is to ensure that the drawn The silver-filled air holes in the emerging fiber are similar in size to the other air holes.

In the step 2, the diameter of the solid quartz glass filling filament is smaller than the diameter of the solid quartz glass rod.

In the step 2, the outer diameter of the quartz glass outer tube is 13-20 mm, and the inner diameter is 7.5-14.5 mm, which is convenient for making the optical fiber preform.

In the step 3, the heating temperature is 1790°C-1820°C.

In the step 3, the pulling speed is 0.8-2.4m/min.

In the step 3, the rod feeding speed is 1.5mm/min-3.8mm/min.

A kind of metal silver filled photonic crystal fiber and its preparation method that spontaneously produces SPR effect of the present invention, its working principle is:

The center of the structured photonic crystal fiber is made of a solid silica glass rod, surrounded by a quartz capillary with air holes, the air holes can make the effective refractive index of the cladding lower than that of the core, forming a core with a high refractive index. The structure of the surrounding cladding enables the light to transmit forward in the form of total internal reflection in the fiber, and the air hole is filled with silver wire to make the fiber form the SPR effect. The light is totally reflected at the interface between the core and the cladding, and the evanescent wave formed has a certain penetrating ability. When the evanescent wave contacts the silver, it will excite the free electrons on the surface of the silver metal to vibrate regularly, forming a surface plasmon wave. Resonance occurs when light waves and surface plasmon waves meet the phase matching conditions, which is called SPR. When resonance occurs, most of the energy will be absorbed, so an obvious absorption peak will be formed in the absorption spectrum.

Compared with the prior art, the present invention has the advantages of: a photonic crystal optical fiber preparation method that can spontaneously generate the SPR effect disclosed by the present invention, its manufacturing process is simple, convenient and controllable, compared with the existing method on the surface of the optical fiber The method of coating and coating the metal film on the inner wall of the optical fiber air hole has significant advantages. Moreover, the manufacturing method of this new type of photonic crystal fiber is universal, and the structure of the photonic crystal fiber can be flexibly designed, and the performance of the fiber can be changed by adjusting parameters such as the arrangement and size of air holes. The proposal of the invention provides an effective new method for the design and manufacture of photonic crystal fiber, especially photonic crystal fiber combined with SPR effect.

The present invention designs a metal silver-filled photonic crystal fiber that spontaneously produces the SPR effect, which can spontaneously produce the SPR effect without subsequent complicated coating or filling treatment on the optical fiber, and can also be applied to the sensing field and the production of optical devices, saving Complicated and expensive coating methods such as magnetron sputtering and chemical vapor deposition have been eliminated, and the gap between the fiber core and the quartz glass capillary, and the gap between the quartz glass capillary, is considered to be a regular arrangement of air holes, a large The complexity and cost of production are reduced. The invention is a general design and preparation method, which is also applicable to other photonic crystal fiber structures.

Description of drawings

Fig. 1 is the schematic diagram of the cross-sectional structure of a photonic crystal fiber filled with metallic silver that spontaneously produces the SPR effect of the present invention;

In the figure, 1 is the air hole of the quartz glass capillary; 2 is the silver wire; 3 is the fiber core; 4 is the quartz glass capillary; 5 is the gap between the outermost quartz glass capillary and the quartz glass outer tube; 6 is the quartz glass jacket Tube; 7 is the gap between the quartz glass capillary tubes;

d ₁ is the diameter of the quartz glass capillary; d ₂ is the diameter of the air hole formed by the pores of the quartz glass capillary; d ₃ is the diameter of the air hole in the quartz glass capillary filled with silver wire.

Fig. 2 is a microscope view of a section of a metal silver-filled photonic crystal fiber that spontaneously produces the SPR effect according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of the manufacturing process of the metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect of the present invention.

Fig. 4 is the spectrum of the metal silver filled photonic crystal fiber which spontaneously produces the SPR effect simulated by the simulation software of the present invention.

Fig. 5 is the measured spectrum of the metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect prepared by the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with embodiment.

In the following embodiments, the simulation software used is Comsol.

In order to make the above purpose and advantages easier to understand, a metallic silver-filled photonic crystal fiber that spontaneously generates the SPR effect provided by the present invention and its preparation method will be described in detail below through examples. However, those skilled in the art will appreciate that various changes in form and details may be made within the scope of the claims, and therefore the present invention is by no means limited to the embodiments described below.

Example 1

A metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect, which is an optical fiber cladding structure, specifically including a core and a cladding, the core 3 is a solid silica glass rod, and the cladding includes a silica glass capillary 4 , air hole and silver wire 2, the air hole is divided into three types:

The first type: the pores 1 of the quartz glass capillary;

The second type: the gap 7 between the quartz glass capillary tubes;

The third type: the gap between the quartz glass capillary and the solid quartz glass rod;

The fiber core 3 is provided with multiple layers of quartz glass capillary tubes 4 around its vertical direction, and in the second layer of quartz glass capillary tubes, a silver wire 2 is provided in the pores of one of the quartz glass capillary tubes.

The air hole can make the effective refractive index of the cladding lower than that of the fiber core, so as to ensure the propagation of light in the fiber core.

The silver wire 2 is arranged in the air hole of the quartz glass capillary, and the silver wire can make the optical fiber form the SPR effect.

In the metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect, the cladding also includes a quartz glass outer sleeve 6 and a solid quartz glass filling wire, and the core that is provided with a multilayer quartz glass capillary is inserted into the quartz glass In the glass outer tube 6 , the gap 5 between the outermost quartz glass capillary and the quartz glass outer tube is filled with solid quartz glass filler wire.

Described quartz transparent capillary 4 is hexagonally distributed around the longitudinal direction of fiber core 3, that is, from the inside of the fiber core outward, there are 6 quartz transparent capillaries in the first layer, 12 quartz transparent capillaries in the second layer, and 12 in the third layer. There are 18 layers of quartz transparent capillaries.

The diameter of the photonic crystal fiber filled with metallic silver that spontaneously produces the SPR effect is 150 microns; the diameter of the solid quartz glass rod is 15 microns, and the diameter d1 of the quartz glass capillary ₄ is 15 microns; The air hole diameter _d2 formed by the pores 1 of the capillary is 4.9 microns; the air hole diameter _d3 of the quartz glass capillary filled with silver wire is 7 microns.

The metallic silver-filled photonic crystal optical fiber that spontaneously produces the SPR effect, its solid quartz glass filling filaments are solid quartz glass filling filaments of different diameters. Photonic crystal fibers leave no gaps.

A method for preparing a metal silver-filled photonic crystal fiber that spontaneously produces an SPR effect, comprising the following steps:

Step 1: Design the metal silver-filled photonic crystal fiber structure that spontaneously produces the SPR effect according to actual needs. The schematic diagram of the cross-sectional structure of the metal silver-filled photonic crystal fiber that spontaneously produces the SPR effect is shown in Figure 1. The designed metal silver-filled photonic crystal fiber that spontaneously produces the SPR effect The diameter of the silver-filled photonic crystal fiber is 150 microns; the diameter of the solid quartz glass rod is 15 microns, and the diameter d1 _of the quartz glass capillary is 15 microns; the air hole diameter _d2 formed by the pores of the quartz glass capillary It is 4.9 microns; the pore diameter _d3 of the quartz glass capillary filled with silver wire is 7 microns.

And use the simulation software to theoretically simulate the transmission performance of the metal silver-filled photonic crystal fiber that spontaneously produces the SPR effect, and obtain the spectrum of the metal silver-filled photonic crystal fiber that is to be prepared to spontaneously produce the SPR effect; through the spectrum, it can be obtained that its resonance absorption peak is located at 1450 At nanometer wavelengths, the spectrum is shown in Figure 4.

Step 2: According to the structure of the metal silver-filled photonic crystal fiber that meets the requirements and spontaneously produces the SPR effect, make a solid quartz glass rod, a quartz glass capillary, and a plurality of solid quartz glass filling wires. After screening and cleaning, the diameter is 0.5 A silver wire of 2 mm is inserted into the air hole of one of the quartz glass capillary tubes; wherein, the outer diameters of the solid quartz glass rod and the quartz glass capillary tube are both 2 mm;

Among them, the solid quartz glass rod is drawn from a glass rod with an outer diameter of 20 mm to obtain a solid quartz glass rod with a diameter of 2 mm. The drawing process is as follows: pulling speed 0.6 m/min, rod feeding speed 6 mm/min, heating Temperature 1920°C;

Among them, the quartz glass capillary is drawn from a glass rod with an outer diameter of 20 mm and an inner diameter of 6.5 mm to obtain a quartz glass capillary with an outer diameter of 2 mm and an inner diameter of 0.65 mm. The drawing process is: pulling speed 0.59m/min, The rod feeding speed is 6mm/min, and the heating temperature is 1920°C.

A solid quartz glass rod is used as the core, and multilayer quartz glass capillaries are arranged layer by layer from the longitudinal periphery of the fiber core, and the quartz glass capillaries inserted with silver wires are placed on the second layer, and the quartz capillaries arranged in each layer are arranged in a hexagonal shape After each layer is set, it is fixed with adhesive tape. After the setting is completed, the core with the quartz glass capillary is placed in the quartz glass outer tube. The gap between the quartz glass capillary and the quartz glass outer tube is made of solid quartz glass with different diameters. Filling with filling wire to obtain optical fiber preform; since molten silver has higher viscosity and surface tension than air, in order to ensure that the air hole filled with silver in the drawn optical fiber is similar to the size of other air holes, silver wire is selected The diameter is smaller than the inner diameter of the capillary.

The outer diameter of the quartz glass outer tube is 13-20mm, and the inner diameter is 7.5-14.5mm, which is convenient for making the optical fiber preform.

Step 3: Fix the optical fiber preform with the triangular grip of the fixing device of the drawing tower, and put one end of the optical fiber preform into the graphite furnace with openings at both ends. The lowest end face of the optical fiber preform is lower than the highest temperature point in the graphite furnace. The furnace is heated until the optical fiber preform is softened;

The lowest end fabric head of the optical fiber preform falls, and the optical fiber preform is thinned. Control the auxiliary pulley of the drawing tower to achieve continuous drawing. By adjusting the heating temperature, pulling speed and rod feeding speed, the size of the drawing is controlled to obtain spontaneous production. Metallic silver filled photonic crystal fiber for SPR effect.

During the wire drawing process, the heating temperature is adjusted at 1790°C to 1820°C; the pulling speed is adjusted at 0.8-2.4m/min; the rod feeding speed is adjusted at 1.5mm/min-3.8mm/min, Controlling the size of drawn metallic silver-filled photonic crystal fibers that spontaneously generate the SPR effect. At the same time, the end face of the optical fiber is continuously observed with a microscope, and the internal structure of the photonic crystal fiber is checked until the required photonic crystal fiber is obtained. Detected by the spectrometer, the output spectrum obtained has an absorption peak near 1450nm, which is shown in Figure 5.

By comparing the simulated spectrum in Figure 4 with the measured spectrum in Figure 5, it is proved that the designed metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect is obtained, and the fiber can spontaneously produce the SPR effect.

Example 2

A metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect is the same as that in Embodiment 1.

A method for preparing a metal silver-filled photonic crystal fiber that spontaneously produces an SPR effect, the preparation process of which is shown in Figure 3, including the following steps:

1) The metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect as shown in Figure 1 is designed, and the transmission performance of the metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect is theoretically simulated according to the simulation software, and the prepared spontaneously produces the SPR effect The metal silver-filled photonic crystal fiber has a diameter of 150 microns, the diameter d1 of the core 3 and the quartz glass capillary ₄ is 15 microns, the diameter _d2 of the air hole formed by the pores of the quartz glass capillary is 4.9 microns, and the diameter _d3 of the silver wire filling is 7 microns. Calculated by simulation software, the resonant absorption peak is located at a wavelength of 1450 nanometers.

2) According to the designed structure, the outer diameter is 2 mm quartz glass capillary and solid quartz glass rod;

Among them, the production process of the solid quartz glass rod is: use a glass rod with a diameter of 20 mm to draw a solid quartz glass rod with a diameter of 2 mm, wherein, during the drawing process, the pulling speed is 0.6 m/min, and the rod feeding speed is 6 mm/min. min, the heating temperature is 1920°C.

Among them, the production process of the quartz glass capillary is: a glass tube with an outer diameter of 20 mm and an inner diameter of 6.5 mm, drawing a quartz glass capillary with an outer diameter of 2 mm and an inner diameter of 0.65 mm, wherein, during the drawing process, the pulling speed is 0.59m/ min, the rod feeding speed is 6mm/min, and the heating temperature is 1920°C.

3) After screening and cleaning, fill the silver wire with a diameter of 0.5 mm into the pores of a quartz glass capillary, and then discharge it on the second layer, and fix each layer with adhesive tape, and put it into a large diameter quartz glass outer tube In the process, the surrounding voids are filled with solid quartz glass filler wires of different diameters to obtain optical fiber preforms. Compared with air, molten silver has higher viscosity and surface tension, so in order to ensure that the air hole filled with silver in the drawn optical fiber is similar to other air holes in size, the diameter of the silver wire is selected to be smaller than the inner diameter of the capillary.

4) Use the triangular grip of the drawing tower to fix the optical fiber preform, pass the bottom end of the optical fiber preform through the graphite furnace, the lowest end surface is lower than the highest temperature point of the graphite furnace, and heat until the quartz glass in the optical fiber preform is softened. The optical fiber preform is thinned by the falling gravity of the lowest end fabric head of the optical fiber preform, and the auxiliary traction wheel of the drawing tower is used to achieve continuous drawing. At the same time, the graphite furnace is continuously filled with high-purity argon as a protective gas.

5) During the wire drawing process, adjust the heating temperature within the range of 1790°C to 1820°C, adjust the pulling speed between 0.8-2.4m/min, and adjust the rod feeding speed between 1.5mm/min-3.8mm/min, control Drawing a metallic silver-filled photonic crystal fiber that spontaneously produces the SPR effect to size. At the same time, use a microscope to observe the end face of the fiber and check the internal structure of the photonic crystal fiber until the required photonic crystal fiber is obtained. Among them, the cross-sectional schematic diagram of the silver-filled photonic crystal fiber that spontaneously produces the SPR effect is shown in Figure 2. Detected by a spectrometer, the obtained output spectrum has an absorption peak around 1450nm.

Claims (5)

1. a kind of preparation method of the metallic silver filling photonic crystal fiber of spontaneous generation SPR effect, the spontaneous generation SPR The metallic silver of effect fills photonic crystal fiber, is fiber cladding structure, including fibre core and covering, and the fibre core is solid stone English glass bar, the covering include quartz glass capillary, airport and filamentary silver, and airport is divided into three kinds:

The first: the stomata of quartz glass capillary；

Second: the gap that quartz glass capillary is spaced each other；

The third: the gap being spaced between quartz glass capillary and solid quartz glass stick；

Longitudinal surrounding of the fibre core is provided with multilayer quartz glass capillary, in second layer quartz glass capillary, In the stomata of quartz glass capillary filamentary silver is set；

In the metallic silver filling photonic crystal fiber of the spontaneous generation SPR effect, the covering further includes quartz glass Outer tube and solid quartz glass fill silk, will be provided with the fibre core of multilayer quartz glass capillary, are inserted in quartz glass housing Guan Zhong, the gap filling solid quartz glass between outermost layer quartz glass capillary and quartz glass outer tube fill silk；

It is characterized in that, the preparation method of the metallic silver filling photonic crystal fiber of the spontaneous generation SPR effect, including following step It is rapid:

Step 1: the design of the metallic silver filling photonic crystals optical fiber structure of spontaneous generation SPR effect is carried out according to actual needs, And theoretical mould is carried out using transmission performance of the simulation software to the metallic silver filling photonic crystal fiber of spontaneous generation SPR effect It is quasi-, obtain the spectrum drawn up for the metallic silver filling photonic crystal fiber of spontaneous generation SPR effect；

Step 2: the structure of photonic crystal fiber is filled according to the metallic silver for the spontaneous generation SPR effect of design met the requirements, It makes solid quartz glass stick, quartz glass capillary and multiple solid quartz glass and fills silk, after screening, cleaning, by filamentary silver It is inserted in the stomata of a quartz glass capillary；Wherein, the outer diameter phase of solid quartz glass stick, quartz glass capillary Deng；

Using solid quartz glass stick as fibre core, from fibre core longitudinal direction, multilayer quartz glass capillary is successively arranged in surrounding, will The quartz glass capillary of insertion filamentary silver is placed in the second layer, and the quartz capillary of every layer of setting is arranged with hexagon, every layer of setting It is fixed afterwards, after being provided with, the fibre core for being provided with quartz glass capillary is placed in quartz glass outer tube, quartzy glass The solid quartz glass filling silk filling of gap different-diameter between glass capillary and quartz glass outer tube, obtains optical fiber Prefabricated rods；

Step 3: preform being fixed using the fixation device of wire-drawer-tower, one end of preform is penetrated into both ends open Graphite furnace in, the minimum end face of preform is heated to predispersed fiber lower than maximum temperature point position in graphite furnace, graphite furnace Stick softening processed；

The least significant end fabric head of preform is fallen, and preform is attenuated, and controls the auxiliary traction wheel of wire-drawer-tower, is realized Continue wire drawing, by adjusting heating temperature, hauling speed and delivery speed, controls the size of wire drawing, obtain spontaneous generation SPR effect The metallic silver filling photonic crystal fiber answered.

2. the preparation method of the metallic silver filling photonic crystal fiber of spontaneous generation SPR effect as described in claim 1, special Sign is, in the step 2, the fibre core, the refractive index of fibre core is 1.45, and the diameter of fibre core is 1 ~ 2mm；

The diameter of the quartz glass capillary is 1 ~ 2mm, and its diameter is equal with core diameter, the quartz glass The hole diameter of capillary is 0.325 ~ 0.65mm.

3. the preparation method of the metallic silver filling photonic crystal fiber of spontaneous generation SPR effect as described in claim 1, special Sign is that the solid quartz glass fills diameter < solid quartz glass stick diameter of silk；

The outer diameter of the quartz glass outer tube is 13 ~ 20mm, and internal diameter is 7.5 ~ 14.5mm.

4. the preparation method of the metallic silver filling photonic crystal fiber of spontaneous generation SPR effect as described in claim 1, special Sign is, in the step 2, the hole diameter of the quartz glass capillary is designed according to actual needs, size The transmission performance that difference obtains optical fiber is different, and the position of the absorption peak of SPR effect is different；

Diameter < quartz glass capillary hole diameter of the filamentary silver；It is provided with the gas of the quartz glass capillary of filamentary silver Bore dia is designed according to actual needs, and the transmission performance that size difference obtains optical fiber is different, the position of the absorption peak of SPR effect Set difference.

5. the preparation method of the metallic silver filling photonic crystal fiber of spontaneous generation SPR effect as described in claim 1, special Sign is, in the step 3, the heating temperature is 1790 DEG C ~ 1820 DEG C；The hauling speed is 0.8 ~ 2.4m/ min；The delivery speed is 1.5mm/min ~ 3.8mm/min.