CN104502279A - Long-range surface plasma resonance device based on tilted fiber bragg grating - Google Patents
Long-range surface plasma resonance device based on tilted fiber bragg grating Download PDFInfo
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- CN104502279A CN104502279A CN201410795798.3A CN201410795798A CN104502279A CN 104502279 A CN104502279 A CN 104502279A CN 201410795798 A CN201410795798 A CN 201410795798A CN 104502279 A CN104502279 A CN 104502279A
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Abstract
The invention discloses a long-range surface plasma resonance device based on a tilted fiber bragg grating. The long-range surface plasma resonance device is characterized by comprising an optical fiber core (1), an optical fiber cladding (2), transparent fluororesin (3), a nanometer gold layer (4) and a tilted fiber bragg grating (5), wherein the tilted fiber bragg grating (5) is inscribed on the optical fiber core (1), the optical fiber cladding (2) wraps outside the optical fiber core (1), the transparent fluororesin (3) wraps outside the optical fiber cladding (2), the nanometer gold layer (4) wraps outside the transparent fluororesin (3), and the whole device is of cylindrical symmetry. The thickness range of the transparent fluororesin (3) is 3-10 micrometers, the thickness range of the nanometer gold layer (4) is 10-100 nanometers, the tile angle of the tilted fiber bragg grating (5) is 2-10 degrees, the grating period of the tilted fiber bragg grating (5) is 400-600 nanometers, the gate region length of the tilted fiber bragg grating (5) is 2-20mm, and the bragg wavelength of the tilted fiber bragg grating (5) is 1570-1610 nanometers. The long-range surface plasma resonance device has the advantages of being high in precision, high in resolution, simple in structure, easy to operate and high in sensitivity, and can be applied to various actual projects for measuring change of refraction indexes in various measuring environments.
Description
Technical field
The invention provides a kind of long-range surface plasmon resonance device based on inclined optical fiber grating, belong to technical field of optical fiber sensing.
Background technology
For coated sheet metal, can at the both side surface of sheet metal excitating surface plasma (SPP) respectively, when the thickness of metal is very little time, these two surface waves intercouple in a metal, longitudinal electric field is the pattern of antisymmetry distribution, and the component in a metal shared by field intensity is less, and electromagnetic energy mainly concentrates in the medium on both sides, loss caused by metal is relatively less, and this technology is widely used in unmarked biology sensor.
Long-range surface plasma excimer (LRSPP) excites relative to single metal at inside of optical fibre---the short-range surface plasma of dielectric boundaries (SRSPP), loss is less, sensitivity is higher, because most wave energy is preserved by the evanescent wave being positioned at metal outer.When metal level is very thin and surrounding medium refractive index is identical, the characteristic of long-range surface plasma excimer can be fully utilized.
Inclined optical fiber grating (TFBGs), as short-period grating, is characterized in that making it vertical with spread fiber axle by fine adjustments refractive index angle, and light core and covering show Prague resonance and tens cladding mode resonants of pectination transmitance.The spectral signature of these uniquenesses, discloses the behavior that all patterns supported by optical fiber.Surface plasma is combined with inclined optical fiber grating with the gold-plated of nanometer thickness, opens the high-resolution road of refractive index sensing and immune sensing.
Summary of the invention
The object of the present invention is to provide a kind of long-range surface plasmon resonance device based on inclined optical fiber grating.The present invention has high precision, high resolving power, and structure is simple, and be easy to operation, susceptibility is high, can be applied in the various Practical Projects of all kinds of measurement environment variations in refractive index.
The present invention is achieved through the following technical solutions:
The invention provides a kind of long-range surface plasmon resonance device based on inclined optical fiber grating, it is characterized in that: be made up of fiber core (1), fibre cladding (2), transparent fluororesin (3), nano gold layer (4) and inclined optical fiber grating (5); Inclined optical fiber grating (5) is scribed on fiber core (1), fiber core (1) outer cladding fibre cladding (2), the transparent fluororesin of fibre cladding (2) outer cladding (3), transparent fluororesin (3) outer cladding nano gold layer (4), whole device is Cylindrical symmetry.Transparent fluororesin (3) thickness range is 3-10 micron, nano gold layer (4) thickness range is 10-100 nanometer, the angle of inclination of inclined optical fiber grating (5) is 2-10 degree, the screen periods of inclined optical fiber grating (5) is 400-600 nanometer, the grid region length of inclined optical fiber grating (5) is 2-20 millimeter, and the bragg wavelength of inclined optical fiber grating (5) is 1570-1610 nanometer.
The present invention has high precision, repeatable, and structure is simple, and be easy to operation, security performance is good, high sensitive and resolution, sensitively can measure the change of refractive index.
Principle of work of the present invention is:
First inclined optical fiber grating is coated with the transparent fluororesin (Cytop) (transparent fluororesin is that 1.55 microns of place's refractive indexes are close to 1.3335 at wavelength) of 3-10 micron thickness, then by the Gold plated Layer of a 10-100 nanometer thickness, as shown in Figure 1.
Inclined optical fiber grating after coating puts into the potpourri of water and lithium chloride, and its concentration strictly controls according to the relative index of refraction of transparent fluororesin, namely at wavelength 1.55 microns of places close to 1.3335.The P polarized light of the inclined optical fiber grating after coating shown in Fig. 3 and S polarized light immerse refractive index close to the transmitted spectrum of the wavelength coverage in the solution of 1.3335 from 1525 to 1560 nanometers.
As gold-plated inclined optical fiber grating, S polarization cannot be coupled in layer gold and corresponding emission spectrum, so there is no impact.But the situation of P polarization is really not so, the signal of the surface plasmons around 1545 nanometers is clearly illustrated in Fig. 3, the coenvelope line of contrast P polarization, P polarization is at 1535 to 1542 nanometers display resonance, this is long-range surface plasma excimer, and these are different from the spectral signature of short-range surface plasma excimer.
As shown in Figure 4, for different refractive index environment, when extraneous ring mirror refractive index is 1.3335, long-range surface plasma excimer and all red shifts of short-range surface plasma excimer, the sensitivity of long-range surface plasma excimer is 315 nanometers/RIU, and the sensitivity of short-range surface plasma excimer is 220 nanometers/RIU; When refractive index is about 1.35, the sensitivity of long-range surface plasma excimer is 511 nanometers/RIU, and the sensitivity of short-range surface plasma excimer is 10 nanometers/RIU; Refractive index close to 1.31 time, contrary characteristic can be observed.Visible, when refractive index height, the remolding sensitivity short-range surface plasma excimer of long-range surface plasma excimer is highly sensitive.
Accompanying drawing explanation
Fig. 1 is the long-range surface plasmon resonance device schematic diagram based on inclined optical fiber grating of the present invention;
Fig. 2 is the long-range surface plasmon resonance device cross sectional representation based on inclined optical fiber grating of the present invention;
Fig. 3 is S and the P polarized light pattern insertion loss spectrum schematic diagram of the tilted fiber Bragg grating after coating;
Fig. 4 is long-range surface plasmon excimer and short-range surface plasmon wavelength shift schematic diagram under different refractivity.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
See accompanying drawing 1, based on a long-range surface plasmon resonance device for inclined optical fiber grating, it is characterized in that: be made up of fiber core (1), fibre cladding (2), transparent fluororesin (3), nano gold layer (4) and inclined optical fiber grating (5); Inclined optical fiber grating (5) is scribed on fiber core (1), fiber core (1) outer cladding fibre cladding (2), the transparent fluororesin of fibre cladding (2) outer cladding (3), transparent fluororesin (3) outer cladding nano gold layer (4), whole device is Cylindrical symmetry.Transparent fluororesin (3) thickness range is 3-10 micron, nano gold layer (4) thickness range is 10-100 nanometer, the angle of inclination of inclined optical fiber grating (5) is 2-10 degree, the screen periods of inclined optical fiber grating (5) is 400-600 nanometer, the grid region length of inclined optical fiber grating (5) is 2-20 millimeter, and the bragg wavelength of inclined optical fiber grating (5) is 1570-1610 nanometer.
Figure 2 shows that the long-range surface plasmon resonance device cross sectional representation based on inclined optical fiber grating;
Figure 3 shows that S and the P polarized light pattern insertion loss spectrum schematic diagram of the tilted fiber Bragg grating after coating;
The excimer of long-range surface plasma shown in Fig. 4 and short-range surface plasma polariton modes are along with the drift situation of extraneous variations in refractive index, when ambient refractive index is 1.3335, the two all red shift, when refractive index is about 1.35, long-range surface plasma excimer is red shift and short-range surface plasma excimer blue shift, the red shift of long-range surface plasma resonance resonance wavelength can reach about 500 nanometers/RIU, and the blue shift of short-range surface plasma resonance is only had an appointment the magnitude of 10 nanometers/RIU.
Claims (2)
1. based on the long-range surface plasmon resonance device of inclined optical fiber grating, it is characterized in that: be made up of fiber core (1), fibre cladding (2), transparent fluororesin (3), nano gold layer (4) and inclined optical fiber grating (5); Inclined optical fiber grating (5) is scribed on fiber core (1), fiber core (1) outer cladding fibre cladding (2), the transparent fluororesin of fibre cladding (2) outer cladding (3), transparent fluororesin (3) outer cladding nano gold layer (4), whole device is Cylindrical symmetry.
2. the long-range surface plasmon resonance device based on inclined optical fiber grating according to claim 1, it is characterized in that: transparent fluororesin (3) thickness range is 3-10 micron, nano gold layer (4) thickness range is 10-100 nanometer, the angle of inclination of inclined optical fiber grating (5) is 2-10 degree, the screen periods of inclined optical fiber grating (5) is 400-600 nanometer, the grid region length of inclined optical fiber grating (5) is 2-20 millimeter, and the bragg wavelength of inclined optical fiber grating (5) is 1570-1610 nanometer.
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Cited By (5)
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CN105136741A (en) * | 2015-04-30 | 2015-12-09 | 西北工业大学 | Graphene coated tilted fiber grating-based liquid refractive index sensor |
CN107402088A (en) * | 2017-06-27 | 2017-11-28 | 山东星盾安防科技有限公司 | The fiber grating surrouding rock stress monitoring device and monitoring system of a kind of long term monitoring |
CN107402087A (en) * | 2017-06-27 | 2017-11-28 | 山东星盾安防科技有限公司 | A kind of monitoring device and monitoring system of country rock three-dimensional turbulence stress field |
CN107529615A (en) * | 2017-06-27 | 2018-01-02 | 兖州煤业股份有限公司 | A kind of three-dimensional turbulence stress test method of face surrounding rock |
CN107860750A (en) * | 2017-10-10 | 2018-03-30 | 温州大学 | Sensing device and its parameter optimization method based on inclined optical fiber grating surface plasma body resonant vibration |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105136741A (en) * | 2015-04-30 | 2015-12-09 | 西北工业大学 | Graphene coated tilted fiber grating-based liquid refractive index sensor |
CN107402088A (en) * | 2017-06-27 | 2017-11-28 | 山东星盾安防科技有限公司 | The fiber grating surrouding rock stress monitoring device and monitoring system of a kind of long term monitoring |
CN107402087A (en) * | 2017-06-27 | 2017-11-28 | 山东星盾安防科技有限公司 | A kind of monitoring device and monitoring system of country rock three-dimensional turbulence stress field |
CN107529615A (en) * | 2017-06-27 | 2018-01-02 | 兖州煤业股份有限公司 | A kind of three-dimensional turbulence stress test method of face surrounding rock |
CN107860750A (en) * | 2017-10-10 | 2018-03-30 | 温州大学 | Sensing device and its parameter optimization method based on inclined optical fiber grating surface plasma body resonant vibration |
CN107860750B (en) * | 2017-10-10 | 2020-01-21 | 温州大学 | Sensing device based on tilted fiber bragg grating surface plasma resonance and parameter optimization method thereof |
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