CN102590930A - Surface plasma oscillation based photonic crystal fiber - Google Patents
Surface plasma oscillation based photonic crystal fiber Download PDFInfo
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- CN102590930A CN102590930A CN2012100476979A CN201210047697A CN102590930A CN 102590930 A CN102590930 A CN 102590930A CN 2012100476979 A CN2012100476979 A CN 2012100476979A CN 201210047697 A CN201210047697 A CN 201210047697A CN 102590930 A CN102590930 A CN 102590930A
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Abstract
The utility model discloses a surface plasma oscillation based photonic crystal fiber, which is provided with a solid cladding structure. The structure is provided with three layers of air holes that are arranged in a regular hexagon shape. The air holes at the second layer are deposited with gold films. The solid cladding structure is made from polyethylene. The above mentioned air holes have a diameter of 1 [mu] m and the gap between two holes is 2 [mu] m. The circum-circle of the three layers of air holes arranged in a regular hexagon shape has a diameter of 20 [mu] m. The deposited gold films at the inner wall of the second layer of air holes are 50 [mu] m in thickness. The beneficial effect of the utility model resides in the introduction of a solid cladding structure which has a high sensitivity and the inductivity can be changed and adjusted in accordance to the cladding structure. In comparison to a traditional surface plasma oscillation based inductor, the photonic crystal fiber is capable of probing a larger environment scope. With a smaller size, the photonic crystal fiber can also probe some narrow place or some hostile environment, therefore making it promising for wide use in the future.
Description
Technical field
The invention belongs to a kind of real core photonic crystal fiber, particularly based on the photonic crystal fiber of surface plasma body resonant vibration.
Background technology
As a kind of novel optical fiber, photonic crystal fiber more and more receives the attention of Chinese scholars because it has unique cladding structure, becomes the research focus of field fiber.Compare with common optical fiber, photonic crystal fiber has a lot of special advantages, the unimodular property that ends like nothing, unusual dispersion characteristics, high birefringence characteristic, low loss characteristic etc.Photonic crystal fiber can be divided into real core photonic crystal fiber and hollow-core photonic crystal fiber according to the difference of core material, and the leaded light mechanism of these two kinds of optical fiber is also different, corresponds to full-internal reflection type and photon band gap type respectively.The covering airport of photonic crystal fiber has very strong changeability, designs bore dia or two parameters of pitch of holes of photonic crystal fiber as required, can access different lightwave transmission characteristics.In addition, can also change the spread geometry of covering airport, and the shape that changes covering airport self, new transmission feature can be obtained.
Fibre Optical Sensor has a wide range of applications, and is not only anticorrosive, anti-interference, highly sensitive, light path is flexible, and in light weight, volume is little, simple in structure, be easy to form network.Although have so many advantage, the Fibre Optical Sensor that uses ordinary optic fibre to make sensitive element still exists a lot of shortcomings and " bottleneck " problem to be difficult to solve, like relatively poor guarantor's bias, and bigger coupling loss, and problem such as cross sensitivity.The appearance of photonic crystal fiber has broken through the constraint of traditional fiber, has brought hope for solving these difficulties, and its unique character has been widened the scope of sensory field of optic fibre.At present, photonic crystal fiber aspect Fibre Optical Sensor main research and be applied in the following aspects: the photon crystal optical fiber sensing device of photonic crystal fiber grating sensor, photonic crystal fiber interferometric sensor, doping functional material.
Sensing arrangement proposed by the invention is exactly this type of photon crystal optical fiber sensing device that belongs to the doping functional material.Because the covering and the fibre core of photonic crystal fiber all have been covered with airport; Can be relatively easy to wherein injecting gas, liquid; And even runny material such as liquid crystal; Utilize this advantage to develop photon crystal fiber-optic fiber gas sensor, liquid sensor, the photonic crystal fiber temperature sensor of filling based on liquid crystal in addition etc.When filling some medium in the airport; Have an effect in medium meeting of filling and the field of suddenly fitting in the optical fiber; Make the transmission light intensity in the optical fiber change, and these fill the change that medium can reflect surrounding environment, that is to say; Environmental change has caused the transmission intensity variations indirectly, therefore just can reach the purpose of sensing through the light wave of analyzing output.
It is since the sixties in 20th century that surface plasma body resonant vibration (SPR) is applied to sensing; Otto from Germany has proposed first SPR sensing arrangement; It is theoretical to have set up surface plasma resonance sensing, and afterwards, Kretschmann has also proposed a kind of SPR sensing arrangement based on the way of attenuated total reflection; Be called the Kretschmann sensing arrangement, the main body of these two kinds of structures all is a prism system.The surface plasma resonance sensing technology can realize exempting from marker detection and not damaged detects; And has a real-time; All be widely used with the people closely-related field of living in that biology, chemistry, environment, medical science etc. are many, become a research focus of sensory field.
Summary of the invention
The objective of the invention is to above-mentioned technical Analysis; A kind of photonic crystal fiber based on surface plasma body resonant vibration is provided; This optical fiber is real core cladding structure, adopts the Fibre Optical Sensor of this structured light photonic crystal fiber, and it is controlled and environmental field that survey is wider that sensitivity is good, sensing characteristics is adjustable.
Technical scheme of the present invention:
A kind of photonic crystal fiber based on surface plasma body resonant vibration is real core cladding structure, is provided with three layers in the covering and is the airport that regular hexagon is arranged, and deposits golden film in the second layer airport.
The material of said real core covering is a tygon, and its refractive index is 1.508.
The diameter of said airport is 1 μ m, and the airport spacing is 2 μ m, and the circumscribed circle diameter of three layers of regular hexagon arrangement airport is 20 μ m.
The thickness of said second layer airport inwall deposited gold film is 50nm.
Working mechanism of the present invention:
The photonic crystal fiber of this structure is based on the surface plasma body resonant vibration principle.Surface plasma body resonant vibration (SPR) is a kind of physical optics phenomenon, is the result of light in the metal surface effect.When the TM of incident ripple has identical wave vector with surface plasma wave; The energy coupling will take place at the metal interface place in the two; The energy of part incident light will be absorbed by surface plasma wave, thereby cause the minimizing rapidly of energy of reflection light, on fiber spectrum, obtain resonance absorbing peak.The SPR phenomenon is especially responsive near the refractive index of the measured object thin metal layer, when light is propagated in optical fiber, can interact with golden film and fluid to be measured successively, and the SPR effect takes place.When the refractive index of fluid to be measured changes; The position of SPR absorption peak also can change; The corresponding variation that shows the system loss absorption peak position of exceeding in photonic crystal fiber; Through the limitation loss spectrum of observation analysis photonic crystal fiber, just can experience the variations in refractive index of fluid to be measured, reached the purpose of sensing.
Advantage of the present invention is: the Fibre Optical Sensor that adopts this reality core cladding structure photonic crystal fiber; Sensitivity is better, and sensing characteristics is adjustable controlled with the change of cladding structure, compared to the conventional surface plasma resonance sensor; The environmental field of surveying is wider; Since microminiaturized more, be easy to survey some narrow space, the abominable place of environment, and application prospect is more extensive.
Description of drawings
This photonic crystal fiber cross section structure synoptic diagram of Fig. 1.
Among the figure: 1. covering 2. ground floor airports 3. second layer airports 4. the 3rd layer of air hole 5. metal films
Fig. 2 is the real part of effective refractive index and the graph of a relation of wavelength.
Fig. 3 is the loss of photonic crystal fiber and the graph of a relation of wavelength.
Fig. 4 is that the airport refractive index becomes at 1.34 o'clock by 1.33, the loss spectra of photonic crystal fiber.
Embodiment
Embodiment:
A kind of photonic crystal fiber based on surface plasma body resonant vibration, as shown in Figure 1, be real core cladding structure; Material is a tygon, and its refractive index is 1.508, is provided with three layers in the covering 1 and is the airport 2,3,4 that regular hexagon is arranged; The diameter of airport (d) is 1 μ m; Airport spacing (Λ) is 2 μ m, and the circumscribed circle diameter of three layers of regular hexagon arrangement airport is 20 μ m, and depositing thickness in the second layer airport 3 is the golden film of 50nm.
Set up the sensing arrangement model of this invention with finite element software; The analog sensed process, the effective refractive index of calculating photonic crystal fiber, this effective refractive index is a plural number; Its real part can react dispersion property of photonic crystal fiber, and imaginary part then can be used for finding the solution the loss characteristic of photonic crystal fiber.The Changing Pattern of effective refractive index real part and imaginary part as shown in Figures 2 and 3.
Can find out that by Fig. 2 along with the increase of wavelength, the real part of the effective refractive index of photonic crystal fiber reduces gradually.In Fig. 3, photonic crystal fiber has three places loss absorption peak, and the SPR phenomenon is just represented to have taken place under this wavelength in the position at loss absorption peak place.The first place loss peak peak value is minimum, loss peak broad and small-sized concussion peak is arranged, and the loss peak in this 500nm～600nm wavelength coverage is unfavorable for observing; Other two places loss absorption peak is all fairly obvious, and peak value is bigger, is easy to differentiate and record.Therefore when making sensor, adopt length scanning method monitoring fibre loss,, can not use the wavelength of short-wave band in order to obtain clear and distinctive loss spectra.
Adopt the Fibre Optical Sensor of this reality core cladding structure photonic crystal fiber, be used for the variation of sensing liquid refractivity, sensitivity is better, and sensing characteristics is adjustable controlled with the change of cladding structure.Fluid to be measured injected deposit in the second layer airport of golden film, when the refractive index change delta n of fluid to be measured, the loss absorption peak can be subjected to displacement Δ λ, can obtain the sensitivity S of sensor, S=Δ λ/Δ n (RIU) through computes.If the fluid to be measured refractive index is changed to 1.34 from 1.33, i.e. Δ n=0.01, as can beappreciated from fig. 4, the change in location of loss absorption peak Δ λ=5nm, S=500nm/RIU.
Claims (4)
1. the photonic crystal fiber based on surface plasma body resonant vibration is characterized in that: be real core cladding structure, be provided with three layers in the covering and be the airport that regular hexagon is arranged, deposit golden film in the second layer airport.
2. according to the said photonic crystal fiber based on surface plasma body resonant vibration of claim 1, it is characterized in that: the material of said real core covering is a tygon, and its refractive index is 1.508.
3. according to the said photonic crystal fiber based on surface plasma body resonant vibration of claim 1, it is characterized in that: the diameter of said airport is 1 μ m, and the airport spacing is 2 μ m, and the circumscribed circle diameter of three layers of regular hexagon arrangement airport is 20 μ m.
4. according to the said photonic crystal fiber based on surface plasma body resonant vibration of claim 1, it is characterized in that: the thickness of said second layer airport inwall deposited gold film is 50nm.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105371981A (en) * | 2015-11-23 | 2016-03-02 | 大连理工大学 | Inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor |
| CN105467509A (en) * | 2015-12-09 | 2016-04-06 | 燕山大学 | A photonic crystal optical fiber based on graphene |
| CN106996805A (en) * | 2017-04-19 | 2017-08-01 | 东北石油大学 | Carbon dioxide, salt water and rock reaction power Hygienic monitoring on hands of childhood experimental provision |
| CN106996920A (en) * | 2017-04-19 | 2017-08-01 | 东北石油大学 | A kind of low-refraction PCF spr sensors for being operated in middle-infrared band |
| CN108872157A (en) * | 2018-04-20 | 2018-11-23 | 华中科技大学 | A kind of side polishing open ring type PCF-SPR sensor |
| CN109100331A (en) * | 2018-07-02 | 2018-12-28 | 桂林电子科技大学 | A kind of metallic hole array phasmon fibre optical sensor of regular hexagon lattice structure |
| CN109752345A (en) * | 2019-01-22 | 2019-05-14 | 北京交通大学 | A kind of SPR low-refraction sensor based on negative cruvature photonic crystal fiber |
| CN110907399A (en) * | 2019-11-20 | 2020-03-24 | 河北科技大学 | Photonic crystal fiber structure and refractive index sensor |
| CN110927864A (en) * | 2019-12-11 | 2020-03-27 | 中国电子科技集团公司第四十六研究所 | Metal semiconductor composite microstructure optical fiber for micro optical detector and preparation method thereof |
| CN113049138A (en) * | 2021-03-19 | 2021-06-29 | 东北大学 | Double-layer connection type liquid core anti-resonance optical fiber and temperature measuring device and method thereof |
| CN113466760A (en) * | 2021-05-14 | 2021-10-01 | 东北大学秦皇岛分校 | Temperature self-reference photonic crystal fiber surface plasma resonance magnetic field sensor |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105371981A (en) * | 2015-11-23 | 2016-03-02 | 大连理工大学 | Inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor |
| CN105467509B (en) * | 2015-12-09 | 2018-05-25 | 燕山大学 | A kind of photonic crystal fiber based on graphene |
| CN105467509A (en) * | 2015-12-09 | 2016-04-06 | 燕山大学 | A photonic crystal optical fiber based on graphene |
| CN106996920B (en) * | 2017-04-19 | 2019-08-27 | 东北石油大学 | It is a kind of to work in the low-refraction PCF-SPR sensor of middle infrared band |
| CN106996920A (en) * | 2017-04-19 | 2017-08-01 | 东北石油大学 | A kind of low-refraction PCF spr sensors for being operated in middle-infrared band |
| CN106996805A (en) * | 2017-04-19 | 2017-08-01 | 东北石油大学 | Carbon dioxide, salt water and rock reaction power Hygienic monitoring on hands of childhood experimental provision |
| CN106996805B (en) * | 2017-04-19 | 2019-09-10 | 东北石油大学 | Carbon dioxide, salt water and rock reaction power Hygienic monitoring on hands of childhood experimental provision |
| CN108872157A (en) * | 2018-04-20 | 2018-11-23 | 华中科技大学 | A kind of side polishing open ring type PCF-SPR sensor |
| CN108872157B (en) * | 2018-04-20 | 2019-11-12 | 华中科技大学 | A kind of side polishing open ring type PCF-SPR sensor |
| CN109100331A (en) * | 2018-07-02 | 2018-12-28 | 桂林电子科技大学 | A kind of metallic hole array phasmon fibre optical sensor of regular hexagon lattice structure |
| CN109752345A (en) * | 2019-01-22 | 2019-05-14 | 北京交通大学 | A kind of SPR low-refraction sensor based on negative cruvature photonic crystal fiber |
| CN110907399A (en) * | 2019-11-20 | 2020-03-24 | 河北科技大学 | Photonic crystal fiber structure and refractive index sensor |
| CN110927864A (en) * | 2019-12-11 | 2020-03-27 | 中国电子科技集团公司第四十六研究所 | Metal semiconductor composite microstructure optical fiber for micro optical detector and preparation method thereof |
| CN113049138A (en) * | 2021-03-19 | 2021-06-29 | 东北大学 | Double-layer connection type liquid core anti-resonance optical fiber and temperature measuring device and method thereof |
| CN113049138B (en) * | 2021-03-19 | 2021-12-14 | 东北大学 | Double-layer connection type liquid core anti-resonance optical fiber and temperature measuring device and method thereof |
| CN113466760A (en) * | 2021-05-14 | 2021-10-01 | 东北大学秦皇岛分校 | Temperature self-reference photonic crystal fiber surface plasma resonance magnetic field sensor |
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Application publication date: 20120718 |