CN104360474B - Electrically-controlled non-diffracting beam forming device based on electrowetting effect and control method thereof - Google Patents
Electrically-controlled non-diffracting beam forming device based on electrowetting effect and control method thereof Download PDFInfo
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- CN104360474B CN104360474B CN201410636119.8A CN201410636119A CN104360474B CN 104360474 B CN104360474 B CN 104360474B CN 201410636119 A CN201410636119 A CN 201410636119A CN 104360474 B CN104360474 B CN 104360474B
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Abstract
The invention provides an electrically-controlled non-diffracting beam forming device based on electrowetting effect and a control method thereof. The device comprises a closed cylindrical container and a control circuit. The closed cylindrical container is full of conductive liquid and insulating liquid provided under the conductive liquid; the conductive liquid and the insulating liquid are identical in density and never dissolves each other; the inner wall of the closed cylindrical container is coated with a conductive film; the conductive film is coated with a hydrophobic coating; the inner bottom wall of the closed cylindrical container is coated with a ring-grating transparent electrode which is coated with a dielectric coating; the control circuit is connected with the ring-grating transparent electrode. The electrically-controlled non-diffracting beam forming device allows a non-diffracting propagating distance and the size of a center light spot to be dynamically adjusted through a control circuit and has the advantages of high realizability, low cost, low response speed and the like.
Description
Technical field
The present invention relates to biliquid lenticule generates Beams generation technique field, more particularly, to a kind of based on electricity
The automatically controlled generating means of the diffraction light-free of wetting effect and control method.
Background technology
Diffraction light-free is one group of particular solution in Maxwell's electromagnetic equation, with light velocity propagation and remains focus condition,
The strict solution of null solution Bessel function form has established the basis that it generates Beams in nature, in following field
In can be applied.First Beams spatial transmission characteristic invariance, has attractive prospect, in essence in precision engineering
Almost all occasion in the field of close measurement using Gaussian beam can be replaced using Beams, overcome Gaussian beam
Out of focus, distortion and depth of focus limitation etc., realizes the universal desired high precision and large measuring range target of measuring instrument institute；Its two diffraction light-free
Under the change action of spherical lenss, the application effect in the field such as Laser Processing, laser medicine processed in big aspect ratio is unique；
It three is being expected to apply in field applications such as aerospace communication, energy transmission, electromagnetic wave shell or electromagnetic wave bullets, particularly in future
In current hot micro electronmechanical and field of nanometer technology.
Although the generating mode of Beams is various, being mainly for Beams is generated by Conical Lenses, because
The transmission transfer rate highest of this mode light beam, it is only necessary to a piece of optics, and process relatively easy.However, in micro-optical
Generate Beams in system to be difficult to because of Conical Lenses processing difficulties；Beams are generated according further to Conical Lenses
Correlation theory, Conical Lenses surface figure accuracy directly affects the quality of the Beams of generation；Secondly at Conical Lenses bottom
On the premise of face diameter is certain, its bottom surface directly determines the propagation distance of generated Beams with the angle of the conical surface
Heart spot size, traditional Conical Lenses face shape machining accuracy is costly, and diffraction light-free cannot be realized after machine-shaping
The real-time regulation of beam propagation characteristic；Therefore traditional Beams generating mode greatly limits the application model of Beams
Enclose.
The content of the invention
It is an object of the invention to：For the problem that prior art is present, there is provided a kind of nothing based on electrowetting effect is spread out
The automatically controlled generating means and control method of light are penetrated, conventionally employed Conical Lenses is solved and is generated Beams, its Conical Lenses face
The machining accuracy of shape is costly, and asking for the real-time regulation of Beams propagation characteristic cannot be realized after machine-shaping
Topic.
The goal of the invention of the present invention is achieved through the following technical solutions：A kind of diffraction light-free based on electrowetting effect
Automatically controlled generating means, it is characterised in that the device includes closed hydrostatic column and control circuit, and in the container conductive liquid is filled with
Body and iknsulating liquid, conducting liquid is in lower iknsulating liquid upper, and the conducting liquid is identical with the density of iknsulating liquid, and mutually not
It is compatible, conducting film is coated with the medial wall of the container, hydrophobic coating, the inner bottom of the container are scribbled on the coating of conducting film
Ring grid transparency electrode is coated with wall, the upper of electrode is coated with again dielectric coating, and the control circuit is connected with ring grid transparency electrode.
Preferably, the ring grid transparency electrode is made up of the transparency electrode of multiple donuts, and each donut is equal
It is connected with control circuit, ring grid transparency electrode is coaxial with closed hydrostatic column.
Preferably, the conducting liquid is Na2So4Aqueous solution, the iknsulating liquid is C12H25Br。
Preferably, the conducting liquid contains one or more in NaCl solution, siloxanes, halogenated alkane.
Preferably, hydrophobic coating is politef.
Preferably, the dielectric coating is polyimides or Barium metatitanate..
Preferably, the ring grid transparency electrode is stannum oxide fluorine doped electro-conductive glass.
Preferably, the control circuit include the control circuit include power input, plurality of voltages output interface and
For controlling the control unit of each road magnitude of voltage of plurality of voltages output interface, the plurality of voltages output interface and ring grid respectively
Each ring correspondence of transparency electrode connects.
A kind of control method of claim 1 described device, it is characterised in that the method following steps：
(1) angle theta of the two liquid contact conical interface for needing control realization is determined；
(2) according to formulaThe electricity that respectively each ring in control ring grid transparency electrode is applied
Pressure value U, in formulaThe internal diameter of the closed hydrostatic columns of R, r is that ring grid transparency electrode is each
The radius of ring, △ n are conducting liquid and the refractivity of iknsulating liquid, β0For applied voltage U=0 when conducting liquid and dielectric
The contact interface of body is relative to the contact angle between hydrophobic coating, ε0For the permittivity of vacuum of hydrophobic coating, εrFor conducting liquid
Relative to the relative dielectric constant of hydrophobic coating, δ12For the surface tension between conducting liquid and iknsulating liquid, d is hydrophobic coating
3 thickness.
Compared with prior art, the present invention has advantages below：
1. because Conical Lenses are the contact interfaces of two liquid, there is no machining in the processing technology of lens, keep away
The difficulty that micro- Conical Lenses are difficult to machining is exempted from；
2. due to the formation seriality between fluid molecule, the surface precision of the taper seat that two liquid are formed up to 0.3nm,
Its almost ideal taper seat type, relatively conventional mach Conical Lenses can generate more preferably Beams；
3. due to the spatial transmission distance of Beams that generated by Conical Lenses and refractivity and taper seat
It is inversely proportional to the angle of bottom surface, therefore two liquid that selective refraction rate is closer to, in the cavity volume radius of closed hydrostatic column
On the premise of certain, Beams propagation distance can be allowed longer；
4. due to biliquid contact circular cone angle can be regulated and controled by Electric Field Distribution, therefore can by circuit in each annular transparent
The regulation of electrode voltage, changes the parameter automatically controlled regulation in real time that circular cone angle is realized propagating Beams.
Description of the drawings
Fig. 1 is half section structural representation of the present invention based on the automatically controlled generating means of diffraction light-free of electrowetting effect；
Fig. 2 is the structural representation of ring grid transparency electrode；
Fig. 3 is the control circuit principle sketch of multiplex roles voltage output.
Accompanying drawing marks explanation：
1 is closed hydrostatic column；2 is side electrode；3 is hydrophobic coating；4 is conducting liquid；5 is control circuit；6 are
Ring grid transparency electrode；7 is dielectric coating；8 is the contact interface of two liquid；9 is iknsulating liquid；10 is transparent end cap.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in detail with specific embodiment.
Embodiment
A kind of automatically controlled generating means of the diffraction light-free based on electrowetting effect of the present invention, it is based on the original of electrowetting effect
Reason, using many concentric ring grid electrodes according to adjustment space Electric Field Distribution, control refractive index difference and two immiscible liquid
Formed interface face type is cone, and according to certain mapping relations change Electric Field Distribution change the angle of conical interface with
Realize the real-time regulation of the characteristic parameter of Beams.Beams are primarily adapted for use in micro-optic and diffraction light-free
Beam array, the parameter needed during photocontrol with optical operation especially with Beams spatial transmission invariant feature changes
In the scenes such as change.
The concrete structure of the present invention, as shown in figure 1, being mainly made up of closed hydrostatic column 1 and control circuit 5.This is close
Close in hydrostatic column 1 and fill with that refractive index is different, density is identical and mutual exclusive conducting liquid 4 and iknsulating liquid 9, it is conductive
Liquid 4 is under, iknsulating liquid 9 upper, two kinds of liquid are sealed in the cavity volume of closed hydrostatic column 1 by transparent glass cover-plate 10
In, and can not be with the presence of gas or other liquid.Because conducting liquid 4 is different with the refractive index of iknsulating liquid 9, density suitable, mutual
It is immiscible, therefore in the presence of surface tension, the contact of taper can be naturally form between conducting liquid 4 and iknsulating liquid 9
Interface 8.Conducting film 2 is coated with the medial wall of closed hydrostatic column 1, hydrophobic coating 3 is scribbled on the coating of conducting film 2.It is close
Ring grid transparency electrode 6 is coated with the inner bottom wall for closing hydrostatic column 1, the upper of electrode is coated with again dielectric coating 7, conducting liquid 4
Directly contact with the dielectric coating 7 of the bottom surface of closed hydrostatic column 1.Control circuit 5 is connected with ring grid transparency electrode 6, ring grid
Voltage in transparency electrode 6 on each ring is provided and controlled by control circuit 5.Each ring gate electrode and side are adjusted by control circuit 5
Electric field between wall obeys certain distribution, the contact interface between conducting liquid and dielectric can be adjusted to into surface topography coarse
Up to 0.3 nanometer of perfect taper, so as to the collimated light beam being capable of achieving to irradiating is converted into Beams；Wherein two liquid are in ring
The cone angle of the conical interface formed under the control action of grid shape transparency electrode 6 decides space length and the center of Beams
The size of hot spot, therefore the automatically controlled regulation to Beams parameter is realized, according to certain principle adjustment electric field, with to two
The conical interface cone angle control of liquid contact, realizes the automatically controlled regulation of Beams propagation characteristic.
As shown in Fig. 2 ring grid transparency electrode 6 is made up of the transparency electrode of multiple donuts, each donut is equal
It is connected with control circuit, ring grid transparency electrode 6 is coaxial with closed hydrostatic column 1.The conducting liquid of the present embodiment is Na2So4Water
Solution, iknsulating liquid is C12H25Br.Can be containing one kind in NaCl solution, siloxanes, halogenated alkane or many in conducting liquid
Kind.Hydrophobic coating is politef (Teflon AF1600).Dielectric coating is polyimides or Barium metatitanate..Ring grid are transparent
Electrode is stannum oxide fluorine doped (F TO) electro-conductive glass.
Control circuit includes that the control circuit includes power input, plurality of voltages output interface and for controlling respectively
The control unit of each road magnitude of voltage of plurality of voltages output interface.Control unit can adopt Programmable Logic Controller.Plurality of voltages is defeated
Outgoing interface connection corresponding with each ring of ring grid transparency electrode.
The control method that the cone angle size of the contact conical surface is controlled by control circuit is specially：
(1) angle theta of the two liquid contact conical interface for needing control realization is determined；
(2) according to formulaThe electricity that respectively each ring in control ring grid transparency electrode is applied
Pressure value U, in formulaThe internal diameter of the closed hydrostatic columns of R, r is that ring grid transparency electrode is each
The radius of ring, △ n are conducting liquid and the refractivity of iknsulating liquid, β0For applied voltage U=0 when conducting liquid and dielectric
The contact interface of body is relative to the contact angle between hydrophobic coating, ε0For the permittivity of vacuum of hydrophobic coating, εrFor conducting liquid
Relative to the relative dielectric constant of hydrophobic coating, δ12For the surface tension between conducting liquid and iknsulating liquid, d is hydrophobic coating
3 thickness.
The system also includes required collimated laser beam of supporting power supply, mounting platform and correlation etc..
The present invention operation principle be：
When the conducting liquid 4 that refractive index is different, density is suitable, immiscible and two kinds of liquid of iknsulating liquid 9 are put into one
In individual closed hydrostatic column 1, self-assembling formation can contact in the presence of surface tension between conducting liquid 4 and iknsulating liquid 9
Interface.Due to the difference of two liquid refractivities, its contact interface can be used as optical interface；Secondly as two fluid density phases
When eliminating the need for impact of the gravity to interface shape；Furthermore, due to iknsulating liquid 9 and the medial wall of closed hydrostatic column 1
Electricity infiltration effect, by the control of the spatial distribution to electric field, by the contact interface of two liquid coned face is become, and works as Single wavelength
Collimated light beam along closed hydrostatic column 1 axial direction irradiation after, just can generate Beams：Nothing is generated according to Conical Lenses
The principle and its spatial transmission characteristic of diffracted beam, when the taper seat that two liquid contact interfaces are formed under electric field action, and
The side of taper seat is θ with the angle of bottom surface, and the refractivity of two liquid is △ n, when the internal diameter of closed hydrostatic column 1 is R,
Salt free ligands spatial transmission distance is zmaxFor：
zmax≈R/(Δn·θ) (1)
Salt free ligands hot spot central diameter d size is：
λ in above formula is the wavelength for irradiating parallel Single wavelength light beam, and π is pi constant.
It is theoretical according to electrowetting effect, the applied voltage U on a wherein annular electrode in ring grid shape transparency electrode 6 and its
Relation between the contact angle beta that corresponding liquid contact interface is formed relative to the side wall of hydrostatic column 1 is as follows：
D is the thickness of hydrophobic coating 3 in above formula, and ε 0 and ε r is respectively the permittivity of vacuum and conductive liquid of hydrophobic coating 3
Relative to the relative dielectric constant of hydrophobic coating 3, δ 12 is the surface tension between conducting liquid 4 and iknsulating liquid 9 to body 4, outside β 0
Two liquid contact interfaces are relative to the contact angle between hydrophobic coating 3 during making alive U=0.The contact interface of two liquid is allowed to exist
The conical surface is formed under electric field action, the voltage on each ring of ring grid transparency electrode 6 meets following relation：
In above formulaR is the radius of each ring of ring grid transparency electrode 6.Closed according to geometry
The relation of the angle theta contact angle beta of system's wherein two liquid contact conical interface is θ=β -90 °, each ring in ring grid transparency electrode 6
The voltage of applying is as follows with the taper angle theta corresponding relation for contacting cone interface：
Control circuit 5 applies corresponding voltage to each ring in ring grid transparency electrode 6 respectively according to above formula, just can arbitrarily adjust
The cone angle of the whole contact conical surface, so as to realize the automatically controlled regulation of Beams parameter.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, it is noted that all
Any modification, equivalent and improvement for being made within the spirit and principles in the present invention etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (1)
1. a kind of control method of the automatically controlled generating means of the diffraction light-free based on electrowetting effect, the automatically controlled generating means include
Closed hydrostatic column and control circuit, fill with conducting liquid and iknsulating liquid in the container, conducting liquid is in lower iknsulating liquid
Upper, the conducting liquid is identical with the density of iknsulating liquid, and objectionable intermingling, and on the medial wall of the container conduction is coated with
Film, scribbles hydrophobic coating on the coating of conducting film, is coated with ring grid transparency electrode in the inner bottom wall of the container, electrode it is upper again
Dielectric coating is coated with, the control circuit is connected with ring grid transparency electrode, it is characterised in that the control method following steps：
(1) angle theta of the two liquid contact conical interface for needing control realization is determined；
(2) according to formulaThe magnitude of voltage U that respectively each ring in control ring grid transparency electrode is applied,
In formulaThe internal diameter of the closed hydrostatic columns of R, r is the half of each ring of ring grid transparency electrode
Footpath, △ n are conducting liquid and the refractivity of iknsulating liquid, β0For applied voltage U=0 when conducting liquid and iknsulating liquid connect
Tactile interface is relative to the contact angle between hydrophobic coating, ε0For the permittivity of vacuum of hydrophobic coating, εrFor conducting liquid relative to
The relative dielectric constant of hydrophobic coating, δ12For the surface tension between conducting liquid and iknsulating liquid, d is the thickness of hydrophobic coating 3
Degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410636119.8A CN104360474B (en) | 2014-11-12 | 2014-11-12 | Electrically-controlled non-diffracting beam forming device based on electrowetting effect and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410636119.8A CN104360474B (en) | 2014-11-12 | 2014-11-12 | Electrically-controlled non-diffracting beam forming device based on electrowetting effect and control method thereof |
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| CN104360474A CN104360474A (en) | 2015-02-18 |
| CN104360474B true CN104360474B (en) | 2017-05-17 |
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| CN1947036A (en) * | 2004-03-30 | 2007-04-11 | 皇家飞利浦电子股份有限公司 | Controllable optical lens |
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| CN101796436A (en) * | 2007-08-11 | 2010-08-04 | 奥普托图尼股份公司 | Liquid lens system |
| CN101858996A (en) * | 2009-04-02 | 2010-10-13 | 索尼公司 | Liquid lens apparatus and manufacture method thereof |
| CN102466825A (en) * | 2010-11-16 | 2012-05-23 | 中国科学院兰州化学物理研究所 | Electrowetting zoom lens based on ion liquid |
| CN104102000A (en) * | 2013-04-10 | 2014-10-15 | 齐发光电股份有限公司 | Method for driving liquid lens |
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2014
- 2014-11-12 CN CN201410636119.8A patent/CN104360474B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1947036A (en) * | 2004-03-30 | 2007-04-11 | 皇家飞利浦电子股份有限公司 | Controllable optical lens |
| CN101349810A (en) * | 2007-07-20 | 2009-01-21 | 叶哲良 | Optical axis positioning apparatus for liquid lens |
| CN101796436A (en) * | 2007-08-11 | 2010-08-04 | 奥普托图尼股份公司 | Liquid lens system |
| CN101858996A (en) * | 2009-04-02 | 2010-10-13 | 索尼公司 | Liquid lens apparatus and manufacture method thereof |
| CN102466825A (en) * | 2010-11-16 | 2012-05-23 | 中国科学院兰州化学物理研究所 | Electrowetting zoom lens based on ion liquid |
| CN104102000A (en) * | 2013-04-10 | 2014-10-15 | 齐发光电股份有限公司 | Method for driving liquid lens |
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