CN103885003A - Tiny magnetic field sensor based on metal-clad magnetic fluid waveguide, and measuring system - Google Patents
Tiny magnetic field sensor based on metal-clad magnetic fluid waveguide, and measuring system Download PDFInfo
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- CN103885003A CN103885003A CN201410106288.0A CN201410106288A CN103885003A CN 103885003 A CN103885003 A CN 103885003A CN 201410106288 A CN201410106288 A CN 201410106288A CN 103885003 A CN103885003 A CN 103885003A
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Abstract
The invention discloses a tiny magnetic field sensor based on a metal-clad magnetic fluid waveguide, and a measuring system. The tiny magnetic field sensor based on the metal-clad magnetic fluid waveguide comprises a metal-clad magnetic fluid waveguide structure and a platform. The metal-clad magnetic fluid waveguide structure comprises a metal coupling layer, an upper-layer optical glass sheet, a metal substrate layer and a lower-layer optical glass sheet, wherein the metal coupling layer is deposited on the upper-layer optical glass sheet, the metal substrate layer is deposited on the lower-layer optical glass sheet, a sample chamber is arranged between the upper-layer optical glass sheet and the metal substrate layer, the sample chamber is filled with nanometer magnetic fluid, and a wave guiding layer is formed by the upper-layer optical glass sheet and the sample chamber filled with the nanometer magnetic fluid. The measuring system comprises the tiny magnetic field sensor based on the metal-clad magnetic fluid waveguide, an excitation light source system and an optical signal detection and processing system. According to the tiny magnetic field sensor based on the metal-clad magnetic fluid waveguide, and the measuring system with the tiny magnetic field sensor, the response time is shortened, various sensing means are adopted, implementation is convenient, and the tiny magnetic field sensor based on the metal-clad magnetic fluid waveguide, and the measuring system with the tiny magnetic field sensor can be widely applied to microstructure research.
Description
Technical field
The invention belongs to Technology of Precision Measurement field, be specifically related to a kind of small magnetic field sensor and measuring system thereof based on the waveguide of metallic cover magnetic fluid.
Background technology
Magnetic fluid is also referred to as ferrofluid or magnetic liquid.It is the stable colloidal dispersion being formed among certain liquid by nano level ferromagnetism particle highly dispersed.The applying of this liquid outside magnetic field can cause the motion of magnetic particle in magnetic fluid, magnetic momemt, the gathering that produces magnetic nanometer.Therefore, the water-based of fluid, magnetic, optical property can effectively regulate by externally-applied magnetic field.
In recent years, magnetic fluid is because its good magneto-optical property is widely studied, particularly magnetic birefringence, dichroism, the refractive index that magnetic field is adjustable are widely used in various functional optical instruments, for example sensor, open the light, modulator and photonic crystal fiber etc.On the one hand, from theoretical point view, not a minor matter to the research of magnetic fluid in addition.As typical dipole fluid, be very significant to the research of the motion of phase place in the situation that having He Wu magnetic field, magnetic field of microstructure in magnetic fluid.
The magneto-optic phenomena of magnetic fluid, has particularly been subject to paying close attention to widely about the problem of transmitance under the effect of magnetic fluid thin film outside magnetic field.But, due to the accuracy of experiment, seldom have magnetic fluid that document the mentions super dilute concentration experimental study under small magnetic fields, but this has important directive significance for the formation that contains minority permanent dipole moment particle microstructure.
Through the literature search of prior art is found, the people such as H.Horng are at " Optics letters " VOL.30 (5), 543-545 (2005). above deliver " Designing optical-fiber modulators by using magnetic fluids " and (utilize magnetic fluid design fiber optic modulator VOL.30 (5), 543-545 (2005)) in a literary composition, utilize the magneto-optical property of magnetic fluid to realize fiber optic modulator.In literary composition, technology shows that concentration is that the refractive index outside magnetic field of the water-based magnetic fluid of 0.85emu/g is greater than certain intensity and just can changes (being about 22Oe).But this technology is not done careful research to the region in small magnetic field (being less than 22Oe).Retrieval is also found, the people such as J.Dai are at " Optical Fiber Technology " Vol.17,210-213 delivers on (2011), " Magnetic field sensor based on magnetic fluid clad etched fiber Bragg grating " (magnetic field sensor Vol.17 based on the tectal bragg grating of magnetic fluid, 210-213 (2011)) in a literary composition, by changing the size perpendicular to the axial external magnetic field of bragg grating, utilize reflection bragg wavelength to change and carry out magnetic field sensing.The minimum-B configuration intensity of this commercial measurement is 50Oe(magnetic field intensity unit, oersted).These two kinds of technology have advantage, but they have deficiency: the precision of measuring magnetic field is inadequate, and magnetic fluid sample concentration is high.
Summary of the invention
The object of the invention is for above-mentioned the deficiencies in the prior art, a kind of small magnetic field sensor based on the waveguide of metallic cover magnetic fluid is provided.
For achieving the above object, the technical solution used in the present invention is as follows.
Based on a small magnetic field sensor for metallic cover magnetic fluid waveguide, comprise metallic cover hydromagnetic wave guide structure and platform, described metallic cover hydromagnetic wave guide structure is fixed on described platform; Described metallic cover hydromagnetic wave guide structure comprises metal Coupling layer, upper strata optical glass sheet, metallic substrate layer and lower floor's optical glass sheet, described metal Coupling is deposited upon on the optical glass sheet of described upper strata, described metal substrate is deposited upon on described lower floor optical glass sheet, between described upper strata optical glass sheet and described metallic substrate layer, be provided with sample chamber, in described sample chamber, be marked with nanometer magnetofluid; Upper strata optical glass sheet, be full of nanometer magnetofluid sample chamber form ducting layer.
Further, between described upper strata optical glass sheet and described metallic substrate layer, be provided with a glass plate, described sample chamber is the circular port arranging on described glass plate, on the sidewall of described glass plate, be provided with the sample intake passage being connected with described sample chamber, described upper strata optical glass sheet, lower floor's optical glass sheet and glass plate are bonding integral by optical cement, and nanometer magnetofluid can be injected into sample chamber by described sample intake passage.
Further, described nanometer magnetofluid particle is that mean grain size is the Fe of 10nm
3o
4.
Further, the concentration of volume percent < 6.46 × 10 of described nanometer magnetofluid particle
-3%.
Further, described metal Coupling layer and described metallic substrate layer are made up of gold or silver.
Further, within the scope of optical frequency, the real part of permittivity ε of described metal Coupling layer and described metallic substrate layer
r<-8.0, its imaginary part of dielectric constant ε
i< 15.0.
Further, the thickness of described metal Coupling layer is 20-40nm, the thickness >=100nm of described metallic substrate layer, and the thickness of described sample chamber is 0.5mm-0.7mm.
Further, the refractive index of described upper strata optical glass sheet and described lower floor optical glass sheet is 1.507, and the thickness of described upper strata optical glass sheet is 0.3mm, and the thickness of described lower floor optical glass sheet is 1mm.
The present invention also further provides a kind of measuring system being made up of the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid, and this measuring system comprises small magnetic field sensor, excitation light source system, optical signal detection and the disposal system based on the waveguide of metallic cover magnetic fluid; Described excitation light source system, described optical signal detection and disposal system are arranged on the homonymy of the described small magnetic field sensor based on the waveguide of metallic cover magnetic fluid; Described excitation light source system comprises laser instrument, the laser that described laser instrument sends is incident on the upper surface of described metallic cover hydromagnetic wave guide structure, in the time meeting phase-matching condition, laser inspires Ultra-High Order guided mode in described metallic cover hydromagnetic wave guide structure; Described optical signal detection and disposal system comprise photodetector and computing machine, analyze by the size of reflective light intensity that described photodetector is detected, just can realize the Real-Time Monitoring that external magnetic field changes.
Further, described laser instrument focuses on the rising edge of resonance absorbing peak or the center of negative edge that are incident on reflection spectral line in the mode of free space coupling, and the incident angle of laser is 3-10 °.
The invention has the beneficial effects as follows: first, small magnetic field sensor and measuring system thereof based on the waveguide of metallic cover magnetic fluid provided by the invention do not need to utilize complicated external circuit or additional instrument to carry out sensing, and adopt the self-control magnetic field of miniaturization and liquid core double-sided metal to be coated waveguiding structure, further effective integration makes whole device microminiaturization, even prepares among all-optical chip.The second, use the nanometer magnetofluid liquid diluting, the loss of whole device greatly reduces.The 3rd, the response time accelerates, with existing magnetic fluid, the response time of externally-applied magnetic field is compared, the present invention by this response time by minute the magnitude brought up to second of magnitude.The 4th, the means of sensing are various, and it is convenient to realize, and this kind of small magnetic field sensor can be widely used in the research of microstructure.
Brief description of the drawings
Fig. 1 is the STRUCTURE DECOMPOSITION schematic diagram of metallic cover magnetic fluid of the present invention waveguide.
Fig. 2 is the planimetric map of liquid core metal waveguiding structure of the present invention.
Fig. 3 is the location diagram of incident light of the present invention, the waveguide of metallic cover magnetic fluid and external magnetic field.
The magnetic field intensity that Fig. 4 obtains for the embodiment of the present invention 1 and the graph of a relation of reflectivity.
The magnetic field intensity that Fig. 5 obtains for the embodiment of the present invention 2 and the graph of a relation of reflectivity.Wherein, a, b, c, d, the represented Fe of e, f
3o
4concentration is respectively 0.079%, 0.053%, 0.0395%, 0.0316%, 12.9 × 10
-3%, 6.46 × 10
-3%.
The magnetic field intensity that Fig. 6 obtains for the embodiment of the present invention 2 and the graph of a relation of reflectivity.Wherein, a, b, c, d, the represented Fe of e, f
3o
4concentration is respectively 0.079%, 0.053%, 0.0395%, 0.0316%, 12.9 × 10
-3%, 6.46 × 10
-3%.
In figure, 11-lower floor optical glass sheet, 12-metallic substrate layer, 13-glass plate, 14-sample chamber, 15-sample intake passage, 16-upper strata optical glass sheet, 17-metal Coupling layer, 18-ducting layer, 19-magnetic fluid layer.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Small magnetic field sensor based on the waveguide of metallic cover magnetic fluid of the present invention comprises metallic cover hydromagnetic wave guide structure and platform, and metallic cover hydromagnetic wave guide structure is fixed on platform.Metallic cover hydromagnetic wave guide structure as depicted in figs. 1 and 2, comprise metal Coupling layer 16, upper strata optical glass sheet 17, metallic substrate layer 12 and lower floor's optical glass sheet 11, metal Coupling layer 17 is deposited on upper strata optical glass sheet 16, metallic substrate layer 12 is deposited on lower floor's optical glass sheet 11, between upper strata optical glass sheet 16 and metallic substrate layer 12, be provided with a glass plate 13, one circular port is set on glass plate 13 and forms sample chamber 14, on the sidewall of glass plate 13, be provided with the sample intake passage 15 being connected with sample chamber 14, upper strata optical glass sheet 16, lower floor's optical glass sheet 11 and glass plate 13 are bonding integral by optical cement, nanometer magnetofluid can be injected into sample chamber by sample intake passage 15.Nanometer magnetofluid is at sample chamber 14 interior formation magnetic fluid layer 19, and upper strata optical glass sheet 16 and magnetic fluid layer 19 form ducting layer 18.
As preferably, metal Coupling layer 17 and metallic substrate layer 12 are made up of gold or silver, the real part of permittivity ε of metal in metal Coupling layer and described metallic substrate layer
r<-8.0, its imaginary part of dielectric constant ε
i< 15.0; The thickness of metal Coupling layer is 20-40nm, the thickness>=200nm of described metallic substrate layer.As further preferred, the thickness of sample chamber 14 is 0.5-0.7mm, and the refractive index of skin glass sheet 16 and lower floor's optical glass sheet 11 is 1.507, and the thickness of upper strata optical glass sheet is 0.3mm, and the thickness of lower floor's optical glass sheet is 1mm.The glassy layer that 0.3mm is thick, the 0.5-0.7mm magnetic fluid layer in sample chamber and the thick lower floor's optical glass sheet of 1mm have formed ducting layer, and therefore the thickness of whole ducting layer is millimeter magnitude; The substrate that the golden film of 100nm and above thickness is waveguiding structure, can prevent that energy from leaking out from ducting layer by the bottom of structure.
Laser can inspire Ultra-High Order guided mode in this metal-cladding waveguide structure kind, due to special metal-cladding waveguide structure, (thickness of metal Coupling layer is 20-40nm, be greater than >=100nm of the thickness of metallic substrate layer), in the ducting layer of the Ultra-High Order guided mode inspiring between double layer of metal film, exist with the form of oscillating field, due to the field enhancement effect of waveguiding structure, there is very high distribution of light intensity.Even thereby ensureing applying of extraneous low-intensity magnetic field, the minor alteration of caused magnetic fluid characteristic all can cause the change of Ultra-High Order guided mode coupling condition, thereby changes reflective light intensity.Under the effect in small magnetic field, the subtle change taking Ultra-High Order guided mode as probe in detecting magnetic fluid, realizes the sensing to additional small magnetic field by the movement that detects ATR peak.
In nanometer magnetofluid, preferably contain the Fe that mean grain size is 10nm
3o
4the low concentration magnetic fluid of nano magnetic particle is as the ingredient of the ducting layer of metallic cover hydromagnetic wave guide structure.Under the effect of externally-applied magnetic field, even if magnetic field is small, also can there is Cluster Phenomenon in magnetic fluid, thereby change the coupling condition of Ultra-High Order guided mode.Magnetic fluid sample concentration for magnetic field sensing can be very rare, and its concentration of volume percent can be low to moderate 6.46 × 10
-3%, still can realize the effective sensing to additional small magnetic field.
The measuring system being made up of the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid of the present invention comprises small magnetic field sensor, excitation light source system, optical signal detection and the disposal system based on the waveguide of metallic cover magnetic fluid; Excitation light source system, optical signal detection and disposal system are arranged on the homonymy of small magnetic field sensor; Excitation light source system comprises laser instrument, polarizer and aperture, laser instrument, polarizer and aperture are fixed in order and are kept contour coaxial, optical axis points to the center of metallic cover hydromagnetic wave guide structure, the laser that laser instrument sends is successively by polarizer and aperture, be incident on the upper surface of metallic cover hydromagnetic wave guide structure, in the time meeting phase-matching condition, laser inspires Ultra-High Order guided mode in metallic cover hydromagnetic wave guide structure; Optical signal detection and disposal system comprise photodetector and computing machine, and described photodetector can be arranged on platform and by electric control box and be connected with computing machine; By the size of the reflective light intensity detecting is analyzed, just can realize the Real-Time Monitoring that external magnetic field changes.
The nanometer magnetofluid of dilution injects the sample chamber of metallic cover hydromagnetic wave guide structure and serves as ducting layer, be placed on the central authorities of platform, 850nm pump laser focuses on the upper surface that is incident on waveguiding structure in the mode of free space coupling, in the time meeting the condition of phase matching, reflected light can produce a series of absorption peak, inspires Ultra-High Order guided mode and propagates at ducting layer.Under outside magnetic field effect, the nanometer magnetofluid generation cluster of ducting layer, light wave is propagated in ducting layer with the form of oscillating field, and the ability of light wave is locked in wherein, also the strongest with the interaction of ducting layer medium.Utilize the high-sensitivity characteristic of Ultra-High Order guided mode, reflective light intensity can be found obvious change.Greatly strengthen light intensity intensity sensing by the number percent of incident optical energy in sensitive zones like this, improved the sensitivity of surveying.Thereby realize by the variation of detection of reflected light intensity the Real-Time Monitoring that external magnetic field changes.
As preferably, laser instrument focuses on the rising edge of resonance absorbing peak or the center of negative edge that are incident on reflection spectral line in the mode of free space coupling, and the incident angle of laser is 3-10 °.
Measuring system of the present invention comprises the steps the method for sensing in small magnetic field.
1) build and be deposited on the metal Coupling layer-sample chamber on optical glass upper strata, upper strata-be deposited on the metallic cover hydromagnetic wave guide structure of the metallic substrate layer composition on lower floor's optical glass sheet: after optical glass sheet is cleaned up, at the upper surface sputter gold film of optical glass sheet.Due to upper strata metal film and the parallel placement of lower floor's optical glass sheet, ensure the fabulous depth of parallelism of metallic cover hydromagnetic wave guide structure, to have ensured the constant of sample chamber thickness.
2) metallic cover hydromagnetic wave guide structure is fixed on to the central authorities of platform, photodetector is fixed on to flat edge of table, make laser instrument and the photodetector central shaft symmetry about the coated waveguiding structure of double-sided metal, to ensure that the light positive of waveguiding structure reflection impinges perpendicularly on well the center of photodetector.
3) laser instrument that the angle of divergence is less than to 0.4mrad is successively by polarizer and aperture, make laser become linearly polarized light, polarization mode is transverse electric wave TE or transverse magnetic wave TM, regulate aperture to make the hot spot of light beam less simultaneously, then select incident angle to make laser be incident on the upper surface of optical glass.Incident angle can be selected in the center of rising edge or the negative edge of a resonance absorbing peak.
4), in the time that the intensity of externally-applied magnetic field changes, can be moved with respect to initial light intensity from the laser beam of metallic cover hydromagnetic wave guide structure bottom reflection.According to the movement at ATR peak, can draw the variable quantity of externally-applied magnetic field.
The involved in the present invention method of metallic cover magnetic fluid waveguide to small magnetic field sensing of utilizing, specifically comprises following several embodiment.
The first, the concentration of change magnetic fluid sample.Preparing respectively volumetric concentration is 0.079%, 0.053%, 0.0395%, 0.0316%, 12.9 × 10
-3%, 6.46 × 10
-3the Fe of six kinds of concentration such as %
3o
4sample.Magnetic fluid concentration difference, the refractive index of ducting layer magnetic fluid also can be different, under externally-applied magnetic field one stable condition, have different cluster effects, thus the change of corresponding reflective light intensity also can be different, realize the sensing to small magnetic field.
The second, the direction of change external magnetic field.When magnetic direction is during perpendicular to sample, reflective light intensity can increase.In the time that magnetic direction is parallel to sample, reflective light intensity can reduce, and can realize the sensing to small magnetic direction.
The 3rd, polarization state TE or the TM polarization of change incident light.In the time that light field is parallel with magnetic direction, be o light, it is large that external magnetic field becomes, and can make reflective light intensity to increase.In the time that light field is vertical with magnetic direction, be e light, it is large that external magnetic field becomes.Reflective light intensity diminishes.Prove the anisotropy of nanometer magnetofluid.
Fig. 3 is the location diagram of incident light of the present invention, the waveguide of metallic cover magnetic fluid and external magnetic field, and in figure, E represents electromagnetic electric field component, and H represents electromagnetic magnetic-field component, and k represents electromagnetic wave vector.As shown in Figure 3, the plane at incident light and reflected light place is called plane of incidence.Taking plane of incidence as reference, there are two kinds of putting positions in magnetic field so, and wherein magnetic direction I is positioned at plane of incidence, vertical with waveguide surface; And magnetic direction II is perpendicular to the plane of incidence.And incident light exists two kinds of polarization modes, be respectively TE and TM polarization.In Fig. 3, (a) and (b) represent respectively electromagnetic two kinds of polarization modes, i.e. TE polarization and TM polarization; I and II represent respectively two kinds of modes that apply magnetic field, i.e. magnetic direction I and magnetic direction II.Therefore, there are four kinds of situations in the method for sensing of this measuring system, for example, under TE polarization, can apply magnetic field along magnetic direction I, also can apply magnetic field along magnetic direction II.In the time of TM polarization too.
embodiment 1
Measure respectively according to said above four kinds of situations, in the time that light path is all securing, select some reflectivity minimal values, after exciting Ultra-High Order guided mode, no longer change any part of incident angle and light path, only regulate the intensity of externally-applied magnetic field, can obtain curve as shown in Figure 4.
But aforementioned four kinds of experiments arrange, and only from the relation of magnetic direction and direction of an electric field, in fact only have two kinds of situations.Magnetic direction and the perpendicular situation of electromagnetic electric field component can be called to ordinary light (o light).When the direction of the electromagnetic magnetic-field component in waveguide and externally-applied magnetic field is consistent or when contrary, be ordinary light, corresponding TM polarization, magnetic direction II and TE polarization, two kinds of situations of magnetic direction I.Magnetic direction and electromagnetic electric field component situation are in the same way called to extraordinary ray (e light).When the direction of the electromagnetic electric field component in waveguide and externally-applied magnetic field is consistent or when contrary, be extraordinary ray, corresponding TE polarization, magnetic direction II and TM polarization, two kinds of situations of magnetic direction I.
The standard as judge with magnetic direction, at this time, no longer distinguishes magnetic field and how to apply, and this can be obtained by experiment.Can obtain, for magnetic direction I, TE polarization is ordinary light, and TM polarization is extraordinary ray.Ordinary light is along with the increase of magnetic field intensity, and reflectivity reduces, and extraordinary ray is along with the increase of magnetic field intensity, and reflectivity increases.
Utilizing concentration of volume percent is 0.053% Fe
3o
4magnetic fluid sample, in the time that incident light is respectively TE, TM polarization state, opens respectively the externally-applied magnetic field of vertical and parallel direction, and variation range, from 0-24Oe, increases progressively with 1Oe.In these cases effective sensing is carried out in magnetic field.As seen from Figure 4, the Fe that concentration is 0.053%
3o
4magnetic fluid can be in four kinds of various combination situations, effective sensing being carried out in small magnetic field, and experimental data is stable, is quick on the draw, and the response time is in millisecond magnitude.
As different from Example 1, the present embodiment adopts the dilution Fe of six kinds of different volumes percent concentrations
3o
4magnetic fluid, as sample, is respectively 0.079%, 0.053%, 0.0395%, 0.0316%, 12.9 × 10
-3%, 6.46 × 10
-3%.Now, incident field be called o light parallel with magnetic direction, can cause the refractive index of magnetic fluid sample to become large, and cause reflective light intensity to diminish.By detecting Fe
3o
4the variation of magnetic fluid reflectivity, realizes the effective sensing to additional small magnetic field.Small changes of magnetic field scope is from 0-24Oe.
As seen from Figure 5, the Fe that concentration is 0.079%
3o
4magnetic fluid is the sensitiveest to the sensing in small magnetic field.Magnetic fluid sample concentration is directly proportional to the sensing sensitivity to small magnetic field.Percent by volume is low to moderate 6.46 × 10
-3the Fe of %
3o
4magnetic fluid dilution still can be realized the effective sensing to small magnetic field, and experimental data is stable, and the response time is in millisecond magnitude.
embodiment 3
Utilize the dilution Fe of six kinds of different volumes percent concentrations
3o
4magnetic fluid, as sample, is respectively 0.079%, 0.053%, 0.0395%, 0.0316%, 12.9 × 10
-3%, 6.46 × 10
-3%.As different from Example 2, adopt the incident field vertical with magnetic direction, be called e light, this can cause the refractive index of magnetic fluid sample to diminish, and causes reflective light intensity to become large.By detecting magnetic fluid reflectance varies, realize the effective sensing to additional small magnetic field.Small changes of magnetic field scope is from 0-24Oe.
As seen from Figure 6, the Fe that concentration is 0.079%
3o
4magnetic fluid is the sensitiveest to the sensing in small magnetic field.Magnetic fluid sample concentration is directly proportional to the sensing sensitivity to small magnetic field.Percent by volume is low to moderate 6.46 × 10
-3the magnetic fluid dilution of % still can be realized the effective sensing to small magnetic field, and the response time is in millisecond magnitude.Can be obtained by Fig. 5 and Fig. 6, under o light action, it is large that magnetic fluid refractive index becomes, and reflective light intensity diminishes; Under e light action, magnetic fluid refractive index diminishes, and reflective light intensity diminishes.
Super rare magnetic fluid based on metallic cover hydromagnetic wave guide structure not only can be realized the effective sensing to small magnetic field, and this invention has also proved the anisotropy of magnetic fluid.That the present invention has is simple to operate, accurately and reliably, Quick Measurement, the characteristic such as practical.
The foregoing is only preferred embodiment of the present invention, be not used for limiting practical range of the present invention; If do not depart from the spirit and scope of the present invention, the present invention is modified or is equal to replacement, all should be encompassed in the middle of the protection domain of the claims in the present invention.
Claims (10)
1. the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid, comprises metallic cover hydromagnetic wave guide structure and platform, and described metallic cover hydromagnetic wave guide structure is fixed on described platform; Described metallic cover hydromagnetic wave guide structure comprises metal Coupling layer, upper strata optical glass sheet, metallic substrate layer and lower floor's optical glass sheet, described metal Coupling is deposited upon on the optical glass sheet of described upper strata, described metal substrate is deposited upon on described lower floor optical glass sheet, between described upper strata optical glass sheet and described metallic substrate layer, be provided with sample chamber, in described sample chamber, be marked with nanometer magnetofluid; Upper strata optical glass sheet, be full of nanometer magnetofluid sample chamber form ducting layer.
2. the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid according to claim 1, it is characterized in that, between described upper strata optical glass sheet and described metallic substrate layer, be provided with a glass plate, described sample chamber is the circular port arranging on described glass plate, on the sidewall of described glass plate, be provided with the sample intake passage being connected with described sample chamber, described upper strata optical glass sheet, lower floor's optical glass sheet and glass plate are bonding integral by optical cement, and nanometer magnetofluid can be injected into sample chamber by described sample intake passage.
3. the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid according to claim 1 and 2, is characterized in that, described nanometer magnetofluid particle is that mean grain size is the Fe of 10nm
3o
4.
4. the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid according to claim 1 and 2, is characterized in that, the concentration of volume percent < 6.46 × 10 of described nanometer magnetofluid particle
-3%.
5. the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid according to claim 1 and 2, is characterized in that, described metal Coupling layer and described metallic substrate layer are made up of gold or silver.
6. the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid according to claim 5, is characterized in that, within the scope of optical frequency, and the real part of permittivity ε of described metal Coupling layer and described metallic substrate layer
r<-8.0, its imaginary part of dielectric constant ε
i< 15.0.
7. the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid according to claim 6, it is characterized in that, the thickness of described metal Coupling layer is 20-40nm, the thickness >=100nm of described metallic substrate layer, and the thickness of described sample chamber is 0.5mm-0.7mm.
8. according to the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid described in claim 6 or 7, it is characterized in that, the refractive index of described upper strata optical glass sheet and described lower floor optical glass sheet is 1.507, the thickness of described upper strata optical glass sheet is 0.3mm, and the thickness of described lower floor optical glass sheet is 1mm.
9. the measuring system being made up of the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid, comprises small magnetic field sensor, excitation light source system, optical signal detection and disposal system based on the waveguide of metallic cover magnetic fluid; Described excitation light source system, described optical signal detection and disposal system are arranged on the homonymy of the described small magnetic field sensor based on the waveguide of metallic cover magnetic fluid; Described excitation light source system comprises laser instrument, the laser that described laser instrument sends is incident on the upper surface of described metallic cover hydromagnetic wave guide structure, in the time meeting phase-matching condition, laser inspires Ultra-High Order guided mode in described metallic cover hydromagnetic wave guide structure; Described optical signal detection and disposal system comprise photodetector and computing machine, analyze by the size of reflective light intensity that described photodetector is detected, just can realize the Real-Time Monitoring that external magnetic field changes.
10. the measuring system being formed by the small magnetic field sensor based on the waveguide of metallic cover magnetic fluid according to claim 9, it is characterized in that, described laser instrument focuses on the rising edge of resonance absorbing peak or the center of negative edge that are incident on reflection spectral line in the mode of free space coupling, the incident angle of laser is 3-10 °.
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| CN107032298A (en) * | 2017-04-12 | 2017-08-11 | 河海大学常州校区 | The method and device of circular nano particle micro-structural is prepared based on ultrahigh-order mode |
| CN107621613A (en) * | 2017-01-17 | 2018-01-23 | 江西师范大学 | A kind of method that magnetic field is detected using magnetic fluid fiber waveguide |
| CN107843956A (en) * | 2017-11-10 | 2018-03-27 | 河海大学常州校区 | Electric light N frequency-doubled signal generators based on piezoelectric metal coating optical waveguide |
| CN108563083A (en) * | 2018-06-05 | 2018-09-21 | 河海大学常州校区 | Non linear metal coats waveguide and its full photoabsorption modulation light switchs realization device |
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