CN108037508B - A method of realizing that sub-wavelength is differentiated based on patterning tailoring technique - Google Patents
A method of realizing that sub-wavelength is differentiated based on patterning tailoring technique Download PDFInfo
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- CN108037508B CN108037508B CN201711211040.0A CN201711211040A CN108037508B CN 108037508 B CN108037508 B CN 108037508B CN 201711211040 A CN201711211040 A CN 201711211040A CN 108037508 B CN108037508 B CN 108037508B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/52003—Techniques for enhancing spatial resolution of targets
Abstract
The invention discloses a kind of methods for realizing sub-wavelength resolution based on patterning tailoring technique, comprising: determines that phase regulates and controls film, the phase change 180 degree for the sound wave that the phase regulation film can be transmitted；Phase regulation film is cut, phase regulation film is cut into the quasi-periodic pattern of Pan Luosi lattice, so that the sound wave after the phase regulation film by the cutting forms hyperoscillating phenomenon, to generate the focal spot of sub-wavelength.The sound wave sub-wavelength that the present invention realizes far field is differentiated, and acquired sub-wavelength focal spot full width at half maximum is about 0.25 times of wavelength, it is meant that it is doubled in length resolution, and from entire area, the imaging precision limit can be 4 times of conventional means.
Description
Technical field
The invention belongs to technology of acoustic wave fields, realize sub-wavelength based on patterning tailoring technique more particularly, to one kind
The method of resolution.
Background technique
Realize that the sub-wavelength of sound wave is differentiated for improving imaging based on sound and detection mode (such as B ultrasound, sonar contact
Deng) resolution ratio have great significance.The resolution ratio of imaging and wavelength used are closely bound up.Common device imaging is limited to auspicious
The sharp limit.The length of Rayleigh limit is 0.5 times of wavelength (on the basis of full width at half maximum), also means that the prior art can be differentiated
Minimum length is 0.5 times of wavelength.
The technology of existing practical application can hardly realize sub-wavelength differentiate, correspondingly, using the prior art acoustics at
Image quality amount is all relatively low.And in existing document, realize that sub-wavelength is differentiated, that is, the mode for breaking diffraction limit is mainly base
In the recovery to evanescent wave.It is specific mainly to restore suddenly dying for high frequency using negative refractive index material or ultimate attainment anisotropic material
Wave information.But this mode is only demonstrated experimentally near field, and similar effect is extremely difficult in far field.And it is related in document
And the device arrived is all very huge thick and heavy, it is difficult to process, higher cost is unfavorable for functionization.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, it is real based on patterning tailoring technique that the present invention provides one kind
The method that existing sub-wavelength is differentiated, thus solving the prior art can hardly realize that sub-wavelength is differentiated, so that existing acoustics imaging matter
Amount is all relatively low, and the prior art can not achieve the sub-wavelength resolution techniques problem in far field on a large scale distance.
To achieve the above object, the present invention provides a kind of method for realizing that sub-wavelength is differentiated based on patterning tailoring technique,
Include:
Determine that phase regulates and controls film, the phase change 180 degree for the sound wave that the phase regulation film can be transmitted；It is right
The phase regulation film is cut, and phase regulation film is cut into the quasi-periodic pattern of Pan Luosi lattice, so that
The sound wave after phase regulation film by the cutting forms hyperoscillating phenomenon, to generate the focal spot of sub-wavelength.
Optionally, the quasi-periodic pattern of the Pan Luosi lattice is combined by two kinds of diamond shapes, the acute angle point of described two diamond shapes
Wei not be 36 degree and 72 degree, described two diamond shapes are combined into that be paved with phase regulation film similar to pentagonal quasi-periodic pattern flat
Face, the circular hole cut out are located on the vertex of two kinds of diamond shapes.
Optionally, the radius of the circular hole keeps circular hole big as far as possible and does not interfere with each other, circular hole hole depending on the size of pattern
Diameter and circular hole average headway and the wave length of sound regulated and controled are in an order of magnitude.
Optionally it is determined that phase regulates and controls film, comprising:
Any density is less than to the high score of particle greater than the metallic particles or non-metallic particle of fibrous material and any modulus
Sub- material or soft material solution are uniformly mixed to get mixed solution；Using mixed solution as raw material, using electrostatic spinning technique,
The electrospun fibers with particle are obtained, and then is accumulated by electrospun fibers and forms electrostatic spinning film, the electrostatic spinning
Film is the phase regulation film.
The mixed solution that the present invention obtains after being mixed by variable grain and different high molecular materials or soft material solution,
The electrostatic spinning film that different-diameter and distribution can be prepared, due to the vibration of particle in film, thus to different frequency scope
Sound wave has 180 degree phase change, wherein particle is more, and response frequency gets over low frequency；Film is thicker (in the case where less than 1 millimeter),
Response frequency is also lower.
Optionally, any density be greater than fibrous material metallic particles or non-metallic particle be copper, iron, gold, silver,
Platinum, cobalt, nickel, lead and its corresponding oxide.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
1, the sound wave sub-wavelength for realizing far field is differentiated, and acquired sub-wavelength focal spot full width at half maximum is about 0.25 times of wavelength.
Mean to double in length resolution, and from entire area, the imaging precision limit can be 4 times of conventional means,
In one direction, wavelength used is imaged and reduces half, it is two sides for thin film planar that imaging precision, which doubles,
It is used up sub-wavelength its precision is imaged and all double, therefore imaging precision rises to original 4 times.
2, size reduction.Compared with the design of any similar function before, present invention utilizes the two of first phase phase difference 180 degree
Partial region collective effect can make device area in x, and y both direction all reduces half, so the film gross area can be made to reduce 3/
4 (direction z is incidence wave direction, and xy is vertical with the direction z).
3, capacity usage ratio is higher.The present invention is that the energy of entire plane is utilized, is had higher based on total transmissivity structure
Capacity usage ratio.And the present invention is passive device, is all had great advantage in energy consumption, volume, portability.
Detailed description of the invention
Fig. 1 is the method flow schematic diagram provided by the invention for realizing that sub-wavelength is differentiated based on patterning tailoring technique；
Fig. 2 is the quasi-periodic pattern schematic diagram provided by the invention that phase regulation film is cut into Pan Luosi lattice；
Fig. 3 is that transmission provided by the invention integrates field computation schematic diagram；
Fig. 4 is that Pan's Loews lattice structure provided by the invention emulates transmitted field figure (xz plane)；
Fig. 5 is that Pan's Loews lattice structure provided by the invention emulates transmitted field center detail view and corresponding experiment test chart
(xz plane)；
Fig. 6 is the intensity distribution on the transversal of the field Fig. 5 center；
Fig. 7 is emulation intensity map of the sound-filed simulation provided by the invention specifically generated with distance change；
Fig. 8 is the relational graph of focal spot intensity provided by the invention and full width at half maximum with distance change；
Fig. 9 is the quality of copper particle and polyvinyl alcohol provided by the invention when being 1:8, the fibre that obtains according to the method for the present invention
Tie up the scanning electron microscope (SEM) photograph of film；
Figure 10 be copper particle and polyvinyl alcohol provided by the invention quality be 1:4 when, obtained according to the method for the present invention
The scanning electron microscope (SEM) photograph of fiber membrane；
Figure 11 be copper particle and polyvinyl alcohol provided by the invention quality be 1:2 when, obtained according to the method for the present invention
The scanning electron microscope (SEM) photograph of fiber membrane；
Figure 12 be copper particle and polyvinyl alcohol provided by the invention quality be 1:1 when, obtained according to the method for the present invention
The scanning electron microscope (SEM) photograph of fiber membrane；
The fiber membrane that Figure 13, which is the quality of copper particle and polyvinyl alcohol provided by the invention, to be obtained when being 1:8 carries out sound wave
Transmit the result figure of test；
The fiber membrane that Figure 14, which is the quality of copper particle and polyvinyl alcohol provided by the invention, to be obtained when being 1:4 carries out sound wave
Transmit the result figure of test；
The fiber membrane that Figure 15, which is the quality of copper particle and polyvinyl alcohol provided by the invention, to be obtained when being 1:2 carries out sound wave
Transmit the result figure of test；
The fiber membrane that Figure 16, which is the quality of copper particle and polyvinyl alcohol provided by the invention, to be obtained when being 1:1 carries out sound wave
Transmit the result figure of test.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Aiming at the above defects or improvement requirements of the prior art, the present invention is based on transmission phase can be changed 180 degree
Film and specific pattern design rule are to realize that sub-wavelength is differentiated.Film is cut using laser cutting or other cutting means
At designed pattern, sub-wavelength resolution can be carried out to the sound wave of different frequency.The sub-wavelength focal spot told can be used for
The imaging of sub-wavelength acoustic scan, can be greatly improved imaging resolution.Shearing on this fexible film is very convenient, and
Integral device is also very light, and cost is relatively low, is conducive to large-scale production production.This mode be also it is passive, in energy consumption and portable
Property on have advantage.
Fig. 1 is the method flow schematic diagram provided by the invention for realizing that sub-wavelength is differentiated based on patterning tailoring technique, such as
Shown in Fig. 1, including step S101 to step S102.
S101 determines that phase regulates and controls film, the phase change 180 for the sound wave that phase regulation film can be transmitted
Degree.
S102 cuts phase regulation film, and phase regulation film is cut into the quasi- week of Pan Luosi lattice
Phase pattern, so that the sound wave after the phase by the cutting regulates and controls film forms hyperoscillating phenomenon, to generate sub-wavelength
Focal spot.
Wherein, the length of Rayleigh limit is 0.5 times of wavelength (on the basis of full width at half maximum), also means that prior art energy
The minimum length of resolution is 0.5 times of wavelength.And the target that sub-wavelength is differentiated seeks to generate a full width at half maximum lower than Rayleigh pole
The focal spot of limit for length's degree.
Optionally, the quasi-periodic pattern of Pan Luosi lattice is combined by two kinds of diamond shapes, and the acute angle of two kinds of diamond shapes is respectively 36 degree
With 72 degree, described two diamond shapes, which are combined into, is paved with phase regulation thin film planar similar to pentagonal quasi-periodic pattern, cuts
Circular hole out is located on the vertex of two kinds of diamond shapes.
Optionally, the radius of circular hole is depending on the size of pattern, keeps circular hole big as far as possible and does not interfere with each other, circular hole aperture and
Circular hole average headway and the wave length of sound regulated and controled are in an order of magnitude.
Fig. 2 is the quasi-periodic pattern schematic diagram provided by the invention that phase regulation film is cut into Pan Luosi lattice.Such as
Shown in Fig. 2, according to the embodiment of the present invention, main body is made of film 1 to be cut and cutting mode 2.By film according to Fig. 2's
Method is cut, when plane sound wave normal incidence to cutting after film surface when, can be counted according to Rayleigh-Suo Mofei diffraction formula
Calculate corresponding transmission field distribution.Dash area represents the sound wave initial phase after transmission as 180 degree in Fig. 2, and blank parts represent
Sound wave initial phase is 0.
As shown in Fig. 2, the pattern that dotted line is sketched the contours of in figure is the quasi-periodic pattern similar to Pan Luosi lattice.Pattern is by two
Kind diamond shape (acute angle is respectively 36 degree and 72 degree) is combined into, and is paved with a plane similar to pentagonal quasi-periodic pattern with this
(specific size is depending on the period), the circular hole being cut into are located on the vertex of diamond shape.The radius of circular hole is according to the big of pattern
Depending on small, keep circular hole big as far as possible and do not interfere with each other.Circular hole aperture and circular hole average headway are also with regulated and controled wavelength in a quantity
Grade.
In a specific example, Circularhole diameter can be set as 4 millimeters, diamond shape side length is 16 millimeters, the wave length of sound of adjusting
It is 11 millimeters -17 millimeters.
One simple case of hyperoscillating function is as follows:
F (x)=∑ ancos(2πnx)
Formula indicates the superposition of the cosine function of some different space frequency components, and f (x) indicates that hyperoscillating function, x indicate
Position on one direction, anThe intensity of n-th ingredient in representative function, in other words to the contribution of generic function.By suitable
Choose anValue, can finally to be superimposed and obtain the component of more high frequency (vibration is faster).anValue correspond to the tribute of each section
It offers, the point of different location determines to the contribution of target focal spot by them to the distance of focal spot and direction on the Thinfilm pattern cut
It is fixed, so specific a can be formed by adjusting the distribution of Thinfilm patternnDistribution.And Pan Luosi lattice is to the diffraction of transmitted field
Superposition just meets similar relationship, can be superimposed the component for generating more high frequency.The component for generating more high frequency can just make
The minimum full width at half maximum for obtaining focal spot is limited to the component of this high frequency, so that the full width at half maximum of focal spot is less than with incident frequencies
On the basis of Rayleigh criterion.
Specifically, corresponding transmission field distribution can be calculated according to Rayleigh-Suo Mofei diffraction formula.The formation of its transmitted field
Specifically as shown in Figure 3: a in Fig. 3, b figure are two kinds of situation classes the case where discussion under rectangular coordinate system and cylindrical coordinate respectively
Seemingly, here mainly with rectangular coordinate system introduction.Plane where XOY indicates sub- sound source face, and the plane where point S is for we
Any one of interest is parallel to the object penetrating plane in sound source face, and P indicates acoustic pressure.The acoustic pressure at any point of objective plane
(amplitude and phase comprising acoustic pressure) is the result that the sub- sound wave that all source points issue on sound source face is superimposed at target point.By auspicious
Li-Suo Mofei diffraction integral formula, the acoustic pressure of any is expressed as that (part of no film is to transmitted field in available target face
Contribution):
Wherein,ω is the angular frequency of incidence wave, and k is the wave vector of incidence wave.ρairFor the density of air,It is source point (x under rectangular coordinate systemS,yS,zS) and target point (x, y, z) between
Distance, Ω1Indicate the integrating range of no film portion (cropped part).
And being directed to has the part of film to be equivalent to this part since film has the phase change of 180 degree to incident acoustic wave
Initial phase increases 180 degree, so showing in formula then are as follows:
Wherein, Ω2Indicate the integrating range of film portion.
Under cylindrical coordinate, similar has:
Wherein,It is source point (r under cylindrical coordinateS,θS,zS) and target point
The distance between (r, θ, z).
Fig. 4 is the emulation intensity map of the hyperoscillating sound-filed simulation specifically generated, and the plane shown is x/y plane, plane sound
To patterned device surface, the phase of 180 degree occurs wave normal incidence for the sound wave for being incident on device dash area (not cutting part)
Position changes, and be incident on blank parts (by part is reduced) does not occur phase change.Every bit in plane is as sub- sound source phase
Mutually interference superposition is finally formed after device and is vortexed.From the field of behaviour of Fig. 4 it may be seen that entire plane forms one
Five axisymmetric patterns, and at bosom, there is the focal spot that intensity is weaker at one, is exactly formed by hyperoscillating Asia wave herein
Long focal spot.
Fig. 5 is the experiment test intensity figure of the emulation intensity map and corresponding region of the central part intercepted out from Fig. 4.Institute's exhibition
The plane shown is x/y plane, and from this figure it may be seen that experimental result and emulation coincide very well, and center has at one
Weaker focal spot, as hyperoscillating sub-wavelength focal spot, that is to say, that be sub-wavelength at the bosom of the sound wave flat field after transmission
Focal spot.
Further, Fig. 6 is two intensity distributions by the center of circle intercepted from the emulation and experiment distribution of Fig. 5,
We, which can be more clearly visible that between two intensity peaks, from strength distribution curve a small peak, and this small peak is exactly
Represent the focal spot of hyperoscillating formation.It will be appreciated from fig. 6 that the reality of half high half-breadth of the small peak that hyperoscillating is centrally formed in transmission region
Test result are as follows: 4.8mm, simulation result are as follows: 3.5mm illustrates the transmitted acoustic pulse center that cutting pattern through the invention obtains
The full width at half maximum of focal spot be smaller than Rayleigh criterion (7.3mm, by regulation wave length of sound half), therefore form sub-wavelength
The focal spot of width is imaged for sub-wavelength acoustic scan, imaging resolution can be greatly improved.
Fig. 7 is the emulation intensity map of the sound-filed simulation that specifically generates with distance change, and the plane shown is x/y plane, point
4 distance z (z are not simulated1=28mm, z2=31mm, z3=32mm, z4=40mm.) under situation, these distance under all
Form ideal hyperoscillating phenomenon.It will be seen that increasing with distance, center focal spot intensity first weakens and enhances afterwards, and burnt
Spot width is also first to reduce to increase afterwards, it is seen that the sound of the phase regulation film after the cutting that Fig. 2 is provided in a certain range
Wave has such hyperoscillating phenomenon, illustrates to may be implemented using tailoring technique provided by the invention in far field on a large scale distance
Sub-wavelength differentiate, and the focal spot of sub-wavelength width can be generated.
Fig. 8 more clearly illustrates focal spot intensity and full width at half maximum with the relationship of distance change, it may be seen that distance
For the focal spot that can form sub-wavelength between 24 to 40 millimeters, the full width at half maximum of focal spot is smaller than Rayleigh criterion, that is, realizes
Far field is on a large scale apart from interior sub-wavelength super-resolution.And correspondingly, when focal spot minimum when is also intensity minimum, this
Meet the principle of hyperoscillating, practice is the power for needing to correspondingly increase sound source, to improve the size of focal spot intensity.
The sub-wavelength that the present invention realizes far field is differentiated, and can be used for acoustic scan imaging.Acquired sub-wavelength focal spot half
High overall with is about 0.25 times of wavelength.Mean to double in length resolution, and from entire area, the imaging precision limit
It can be 4 times of conventional means.Present invention utilizes two parts region collective effects of first phase phase difference 180 degree, can make film
Area reduces.The present invention is based on total transmissivity structures, and the energy of entire plane is utilized, and have higher capacity usage ratio.And
The present invention is passive device, is all had great advantage in energy consumption, volume, portability.
Optionally it is determined that phase regulates and controls film, comprising: any density is greater than the metallic particles of fibrous material or nonmetallic
Particle and any modulus are less than the high molecular material of particle or soft material solution is uniformly mixed to get mixed solution；It will mix molten
Liquid is as raw material, using electrostatic spinning technique, obtains the electrospun fibers with particle, and then accumulate shape by electrospun fibers
At electrostatic spinning film, the electrostatic spinning film is phase regulation film.
The mixed solution that the present invention obtains after being mixed by variable grain and different high molecular materials or soft material solution,
The electrostatic spinning film that different-diameter and distribution can be prepared, due to the vibration of particle in film, thus to different frequency scope
Sound wave has 180 degree phase change, wherein particle is more, and response frequency gets over low frequency；Film is thicker (in the case where less than 1 millimeter),
Response frequency is also lower.
Optionally, any density be greater than fibrous material metallic particles or non-metallic particle be copper, iron, gold, silver, platinum, cobalt,
Nickel, lead and its corresponding oxide.
Optionally, the area of electrostatic spinning film is with the syringe for spinneret in the plane perpendicular to spinneret direction
Moving range is related, and moving range is bigger, and the area of electrostatic spinning film is bigger.The thickness of electrostatic spinning film and spinning time
Related, the spinning time is longer, and the thickness of electrostatic spinning film is thicker.The diameter of electrospun fibers is related with spinning voltage, spins
Filament voltage is bigger, and the diameter of electrospun fibers is smaller.Numbers of particles and particle and high molecular material in electrostatic spinning film
Or the mass ratio of soft material solution is related, mass ratio is bigger, and numbers of particles contained in electrostatic spinning film is more.
It describes in detail below in conjunction with specific embodiment to phase provided by the invention regulation film:
Embodiment 1:
0.5 micron~1.5 microns of diameter of copper particle and polyvinyl alcohol (model: PVA124) aqueous solution are uniformly mixed,
The concentration of the polyvinyl alcohol water solution used is 7%~12%, and the mass ratio of copper particle and polyvinyl alcohol is according to actual needs
It is specific to adjust.
Wherein, it is more stable dense to be also possible to other dissolutions for the concentration of poly-vinyl alcohol solution in embodiments of the present invention
Degree.
Give copper particle in embodiments of the present invention: polyvinyl alcohol is 1:1,1:2,1:4, tetra- kinds of situations of 1:8.It will mix molten
Liquid is as raw material, and using electrostatic spinning technique, 0.5 micron~1.5 microns of available diameter of the electrostatic spinning with particle is fine
Dimension, is accumulated by electrospun fibers and forms electrostatic spinning film.
According to the mixing liquid of different Cu particle and polyvinyl alcohol mass ratio that the present invention configures, the copper being uniformly mixed
After particle/polyvinyl alcohol liquid, so that it may carry out electrostatic spinning for this as raw material.In embodiments of the present invention, change and receive
Distance, spinning voltage inject the electrostatic spinning film of the parameters such as speed available different-diameter and distribution.In a certain range,
Spinning voltage is bigger, and fibre diameter is smaller.The speed injected needs speed (mainly electric field force and surface tension etc. with spinneret
The speed of silk after balance) mutually coordinate.The spinning condition of recommendation are as follows: 25 degrees Celsius of environment temperature, humidity 30%~45%, spinning electricity
9.7kV~11.7kV is pressed, speed 0.02mL/s~0.03mL/s is injected.Manufactured film surface microscopic appearance scanning electron microscope (SEM) photograph is such as
Shown in Fig. 9 to Figure 12, the mass ratio of copper particle and polyvinyl alcohol is respectively 1:8,1:4,1:2,1:1 when electrostatic spinning film production.
Various concentration is more significantly different than numbers of particles as can be seen from Figure.Figure 13 to Figure 16 is respectively that the film of aforementioned proportion carries out sound wave
Transmit the result of test.It may be seen that they can in corresponding frequency range (gray area as shown in Figure 13-Figure 16)
Enough there is the phase change of 180 degree, and maintains higher transmissivity (being greater than 80%).And with the increase of particle accounting,
Frequency range is gradually mobile to low frequency, therefore these films cover the frequency range from 3.8kHz to 24kHz.
Embodiment 2:
By the dimethylformamide (DMF) of 0.5 micron~1.5 microns of diameter of particles of lead oxide and polyacrylonitrile (PAN)
Solution (PAN is not soluble in water, is dissolved in organic solvent such as DMF etc.) uniformly mixes, the DMF solution concentration of the polyacrylonitrile used for
8%~12%, and particles of lead oxide and polyacrylonitrile mass ratio are specifically adjusted according to actual needs.
Wherein, it is more stable dense to be also possible to other dissolutions for the concentration of polyacrylonitrile solution in embodiments of the present invention
Degree.
Provide particles of lead oxide in embodiments of the present invention: polyacrylonitrile is 1:1,1:4,1:8, tetra- kinds of situations of 1:16.It will
Mixed solution is as raw material, using electrostatic spinning technique, the electrostatic with particle that 0.5 micron~1.5 micron of available diameter
Spinning fibre is accumulated by electrospun fibers and forms electrostatic spinning film.
According to the mixing liquid of different particles of lead oxide and polyacrylonitrile mass ratio that the present invention configures, it is uniformly mixed
Particles of lead oxide/polyacrylonitrile mixed liquor after, so that it may using this as raw material carry out electrostatic spinning.In embodiments of the present invention,
Change and receive distance, spinning voltage injects the electrostatic spinning film of the parameters such as speed available different-diameter and distribution.Centainly
In range, spinning voltage is bigger, and fibre diameter is smaller.The speed injected needs speed (the mainly electric field force and table with spinneret
The speed of silk after the tension isoequilibrium of face) mutually coordinate.The spinning condition of recommendation are as follows: 25 degrees Celsius of environment temperature, humidity 30%~
45%, spinning voltage 8.7kV~10.7kV inject speed 0.03mL/s~0.04mL/s.
It is worth noting that example 2 is particles used and soft material can be replaced mutually with example 1, if necessary to last
Film is not soluble in water, then just using polymer not soluble in water such as polyacrylonitrile；There is magnetic just use if necessary to film
Magnetic particle such as ferroso-ferric oxide etc..
Based on electrostatic spinning film of the invention, its thickness is controllable, and the spinning time is longer, and thickness is thicker；Stablize the thickness of film forming
It is only 20 microns that degree is most thin, to be regulated and controled wavelength 1/650, significantly thinner than present level (about 1/250), can be applied more
Scene.Shearing on the electrostatic spinning film that the present invention is prepared is very convenient, and integral device is also very light, cost
It is lower, it is conducive to large-scale production production.The implementation that acoustic phase is regulated and controled using electrostatic spinning film of the invention
Be it is passive, in energy consumption and portability have advantage.
The present invention is based on electrostatic spinning techniques to have made phase regulation film.Due to the vibration of particle in film, can cause
The variation of acoustic wave transmission phase generation 180 degree.The acoustic response frequency of film depends mainly on the density of spinning fibre and particle, mould
Ratio is measured, total particle accounts for and the mass ratio of fibrous material and the thickness of film etc..And these parameters can by material mixture ratio and
Spinning parameter is adjusted.This film can large area continuously manufacture, further, this film can be in conjunction with corresponding cutting
Technology is sheared and is fabricated to multi-functional device.Shearing on this fexible film is very convenient, and integral device
Also very light, cost is relatively low, is conducive to large-scale production production.This mode be also it is passive, have in energy consumption and portability
Advantage.
Optionally, the film that transmission phase changes 180 degree can be made electrostatic spinning film, is also possible to other
Meaning can change the device or material of transmission phase；The part that phase change does not occur is the part being cut (cutting) and being fallen,
Be also possible to arbitrarily change transmission phase, make sound wave completely through material.
Optionally, the pattern of cutting is not limited to scheme described in Fig. 2, and the scheme that Fig. 2 is provided is sound wave Asia wave
The representative of long resolving method is cut using the film that the present invention provides so that the method for obtaining sub-wavelength sound wave belongs to this
In the protection scope of invention.
Optionally, such regulation method is suitable for fluid media (medium), i.e., whether in air or in water or other streams
Regulation in body is all applicable.
Optionally, other than regulating and controlling to sound wave, such method is also fully applicable for the tune to light wave or electromagnetic wave
Control, it is only necessary to which film is substituted for the material that can change light-wave transmission phase.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (4)
1. a kind of method for realizing that sub-wavelength is differentiated based on patterning tailoring technique characterized by comprising
Determine that phase regulates and controls film, the phase change 180 degree for the sound wave that the phase regulation film can be transmitted；
Phase regulation film is cut, phase regulation film is cut into figure paracycle of Pan Luosi lattice
Case, so that the sound wave after the phase by the cutting regulates and controls film forms hyperoscillating phenomenon, to generate the focal spot of sub-wavelength；
The quasi-periodic pattern of the Pan Luosi lattice is combined by two kinds of diamond shapes, and the acute angle of described two diamond shapes is respectively 36 degree and 72
Degree, described two diamond shapes, which are combined into, is paved with the phase regulation thin film planar similar to pentagonal quasi-periodic pattern, cuts out
Circular hole is located on the vertex of two kinds of diamond shapes.
2. the method according to claim 1 for realizing that sub-wavelength is differentiated based on patterning tailoring technique, which is characterized in that institute
The radius of circular hole is stated depending on the size of pattern, keeps circular hole big as far as possible and does not interfere with each other, circular hole aperture and circular hole average headway
With the wave length of sound that is regulated and controled in an order of magnitude.
3. the method according to claim 1 or 2 for being realized that sub-wavelength is differentiated based on patterning tailoring technique, feature are existed
In, determine phase regulate and control film, comprising:
Any density is less than to the macromolecule material of particle greater than the metallic particles or non-metallic particle of fibrous material and any modulus
Material or soft material solution are uniformly mixed to get mixed solution；
Using mixed solution as raw material, using electrostatic spinning technique, the electrospun fibers with particle are obtained, and then by Static Spinning
Silk fiber is accumulated to form electrostatic spinning film, and the electrostatic spinning film is the phase regulation film.
4. the method according to claim 3 for realizing that sub-wavelength is differentiated based on patterning tailoring technique, which is characterized in that institute
It is copper, iron, gold, silver, platinum, cobalt, nickel, lead and its correspondence that any density, which is stated, greater than the metallic particles or non-metallic particle of fibrous material
Oxide.
Priority Applications (1)
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| WO2012151472A2 (en) * | 2011-05-05 | 2012-11-08 | Massachusetts Institute Of Technology | Phononic metamaterials for vibration isolation and focusing of elastic waves |
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| CN106448650A (en) * | 2016-07-04 | 2017-02-22 | 南京大学 | Method for low-frequency sound wave directive propagation by employing sub-wavelength space folding structure metamaterial |
| EP3239973A1 (en) * | 2016-04-28 | 2017-11-01 | Eidgenössische Materialprüfungs- und Forschungsanstalt EMPA | Phononic crystal vibration isolator with inertia amplification mechanism |
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| WO2012151472A2 (en) * | 2011-05-05 | 2012-11-08 | Massachusetts Institute Of Technology | Phononic metamaterials for vibration isolation and focusing of elastic waves |
| CN105158729A (en) * | 2015-09-25 | 2015-12-16 | 南京大学 | Sound source directional sensing device with deep sub-wavelength size |
| CN105895074A (en) * | 2016-04-11 | 2016-08-24 | 南京大学 | Acoustic unidirectional hyper surface |
| EP3239973A1 (en) * | 2016-04-28 | 2017-11-01 | Eidgenössische Materialprüfungs- und Forschungsanstalt EMPA | Phononic crystal vibration isolator with inertia amplification mechanism |
| CN106448650A (en) * | 2016-07-04 | 2017-02-22 | 南京大学 | Method for low-frequency sound wave directive propagation by employing sub-wavelength space folding structure metamaterial |
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