CN109300570B - Optical drive vibration motor device based on optical fiber - Google Patents
Optical drive vibration motor device based on optical fiber Download PDFInfo
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- CN109300570B CN109300570B CN201811236861.4A CN201811236861A CN109300570B CN 109300570 B CN109300570 B CN 109300570B CN 201811236861 A CN201811236861 A CN 201811236861A CN 109300570 B CN109300570 B CN 109300570B
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- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/006—Manipulation of neutral particles by using radiation pressure, e.g. optical levitation
Abstract
The invention belongs to the research field of optical fiber micro-nano technology, and particularly relates to an optical drive vibration motor device capable of stably changing the position and vibration frequency of absorptive particles. The optical driving vibration motor device comprises a first optical fiber light source, a second optical fiber light source, an optical fiber wavelength division multiplexer and an optical tweezers system consisting of single-mode fibers, and forms an optical driving vibration motor device together with the absorptive black ball and liquid. The invention can change the position and the vibration frequency of the driving absorptive particles at the same time by changing the power of the two light sources; the device has accurate position control and simple structure; the light driving can be easily carried out on the absorptive particles of the liquid background; the adopted device has low price and simple preparation method, and is suitable for popularization in the field of biomedicine.
Description
Technical Field
The invention belongs to the research field of optical fiber micro-nano technology, and particularly relates to an optical drive vibration motor device capable of stably changing the position and vibration frequency of absorptive particles.
Background
Optical tweezers were first introduced by Ashkin and his colleagues in 1986 as a tool to explore the micro world. The optical tweezers use the physical characteristics of light to capture and manipulate particles. Its advantage is to work in a gentle non-contact way. The center of the focused laser beam in the optical tweezers system has a capture region, and once the particles fall into the capture region, the particle capture region automatically moves to the geometric center of the beam, so that the particle capture function is realized; and once a particle falls into the geometric center of the beam, the particle can be always captured without strong interference from the outside, namely, the particle cannot deviate from the center of the beam; when the light beam is adjusted slightly, the particles will move along with the light beam, so as to achieve the function of manipulation. Compared with the traditional optical tweezers, the optical tweezers of the optical fiber have simpler structure, easier operation and lower price. The phenomenon of silica particle vibration has been described by ChiouA et al in the paper Mapping of the three-dimensional optical field on a micro-particulate in a fiber-optical dual-beam trap, but the overall structure is relatively complex and does not achieve a light-driven effect of simultaneously manipulating the vibration frequency and position of the silica particles in the liquid. Although optical tweezers can well manipulate most transparent particles, the absorptive particles tend to be subjected to stronger scattering forces, which can destroy the optical traps that bound them and thus make manipulation difficult. Optophoretic forces are a good choice for manipulating the absorbing particles. The manipulation means and techniques for transparent, non-absorbent particles have been well established to date, but little research has been done to manipulate absorbent particles, particularly those suspended in a liquid background. The main difficulty with strongly absorbing particle trapping in liquids is that the illuminated side is more absorbing, which induces forward photophoretic forces to push the particles away from areas where the laser light power density is strong, and the absorbing particles are difficult to trap due to strong scattering forces.
Therefore, a novel optical driving motor device is provided, which can control the absorptive particles in the liquid more stably, and not only can accurately change the position of the absorptive particles in the liquid, but also can change the vibration frequency of the absorptive particles in the liquid, so that the whole structure is simpler and easier to operate.
Disclosure of Invention
The present invention aims to provide an optical fiber-based, simple, optically driven vibration motor apparatus capable of manipulating the position of absorptive particles in a liquid and simultaneously effecting vibration of the particles, utilizing the thermodynamic properties of background liquids such as glycerol and the like and absorptive particles such as black spheres and the like, by optically driving the particles by utilizing the photophoretic force introduced by divergent gaussian light.
The purpose of the invention is realized as follows:
the utility model provides an optical drive vibrating motor device based on optic fibre, includes first optic fibre light source 1, second optic fibre light source 2, optic fibre wavelength division multiplexer 3, single mode fiber 4, absorption black ball 5, liquid 6, the outgoing end of first optic fibre light source 1 and second optic fibre light source 2 welds with optic fibre wavelength division multiplexer 3's incident end simultaneously, and optic fibre wavelength division multiplexer 3's outgoing end welds with single mode fiber 4's one end, and single mode fiber 4's the other end stimulates the gaussian light field that has steadily distributed, single mode fiber 4 imbeds in the liquid 6 that has absorption black ball 5.
The first fiber light source 1 has a stable output wavelength, which is an absorption peak of the absorbent black ball and is not an absorption peak of the liquid matrix.
The second fiber light source 2 has a stable output wavelength. The output wavelength is the absorption peak of the liquid matrix.
The single-mode fiber 4 is an OFS980 single-mode fiber, and the end face of the fiber is a flat end face.
The diameter range of the absorptive black ball 5 is 6-10 μm, and the absorptive black ball absorbs the first optical fiber light source 1 and the second optical fiber light source 2.
The liquid 6 is one of glycerol mixture solution, ethylene glycol mixture solution and sucrose mixture solution, and has a density of 950kg/m3～1350kg/m3Within the range of viscosity coefficient of 1 × 10-3[m2/s]～2×10-3[m2/s]Within the range of (1).
The invention has the beneficial effects that:
(1) the light-driven vibration motor device is provided, and the function of simultaneously changing the position and the vibration frequency of the driving absorptive particles can be achieved by changing the power of the two light sources;
(2) compared with a common optical drive motor device, the device has more accurate position control and simpler structure;
(3) the device can easily perform optical drive on the absorptive particles of the liquid background;
(4) the adopted device has low price and simple preparation method, and is suitable for popularization in the field of biomedicine.
Drawings
FIG. 1 is a schematic diagram of the stress of an absorbent particle in a Gaussian optical field when a temperature gradient exists between two sides of the absorbent particle;
FIG. 2 is a schematic diagram of the stress of the absorbent particle under a Gaussian optical field when the temperature gradient of the liquid on both sides is small;
FIG. 3 is a schematic structural view of the present invention;
fig. 4 is a graph of expected light-driven absorbing particles that vibrate repeatedly at two dashed circle positions.
Detailed Description
The invention will now be discussed in more detail by way of example with reference to the accompanying drawings.
The utility model provides an optical drive vibrating motor device based on optic fibre, including first optic fibre light source 1, second optic fibre light source 2, optic fibre wavelength division multiplexer 3, single mode fiber 4, absorption black ball 5, liquid 6, with the outgoing end of first optic fibre light source 1 and second optic fibre light source 2 simultaneously with the incident end welding of optic fibre wavelength division multiplexer 3, the outgoing end of optic fibre wavelength division multiplexer 3 and the one end welding of single mode fiber 4, can excite the gaussian light field that has steadily distributed at single mode fiber 4's the other end. The working process of the device is as follows: when the first optical fiber light source 1 such as a 980nm light source is turned on, the light-irradiated side of the particles absorbs heat to enable the temperatures of the two sides of the particles to be unequal, and the particles move in the direction far away from the light source through the photophoretic force caused by the temperature gradient. In the process of moving the particles, the temperature difference of the temperatures at two sides of the particles is reduced due to thermal diffusion in the particles, at the moment, the photophoretic force caused by different thermal adaptation coefficients is dominant, the particles move towards the light source, and the movement is repeated until the particles move to generate a certain temperature difference, so that the vibration effect is achieved. When the second optical fiber light source 2 such as 1550nm light source is turned on, the second optical fiber light source 2 is different from the first optical fiber light source 1, the light source in the wavelength band can affect the temperature of the solution, the heat conduction coefficient of the whole solution is changed, the force of the absorptive black ball in the moving direction is also changed, and therefore the effect of controlling the frequency can be achieved.
The first optical fiber light source 1 and the second optical fiber light source 2 have stable output wavelength, and power can be changed to ensure that the generated Gaussian beam can stably change the position and amplitude of the absorbent black ball in the liquid, wherein the wavelength of the first optical fiber light source 1 such as a 980nm light source is the absorption peak of the absorbent particles and is not the absorption peak of the liquid matrix, the position of the absorbent black ball can be changed, and the wavelength of the second optical fiber light source 2 such as a 1550nm light source is the absorption peak of the liquid matrix, so that the frequency of the vibration of the absorbent black ball is changed.
The single-mode fiber 4 is an OFS980 single-mode fiber, and the end face of the fiber is a flat end face.
The diameter range of the absorptive black ball 5 is 6-10 μm, and the absorptive black ball absorbs the first optical fiber light source 1 and the second optical fiber light source 2;
the liquid 6 absorbs the second fiber light source 2 but not or little the first fiber light source 1, and can be one of glycerol mixture solution, ethylene glycol mixture solution or sucrose mixture solution, and the density is 950kg/m3～1350kg/m3Within the range of viscosity coefficient of 1 × 10-3[m2/s]～2×10-3[m2/s]Within the range of (1).
According to the optical drive vibration motor device based on the optical fiber, the optical fiber 4 is embedded into liquid with an absorbing black ball, the black ball vibrates in a reciprocating mode in a direction parallel to a light beam after light is turned on, the position of the first optical fiber light source 1 can be changed by adjusting the power of the first optical fiber light source, and the vibration frequency of the second optical fiber light source 2 can be changed by adjusting the power of the second optical fiber light source.
The working principle is as follows:
for the absorbent particles in the experiment, the particles were subjected to gravity, buoyancy and viscous resistance of the liquid, which was in an equilibrium state in the vertical direction when stably captured in the liquid, and the viscous resistance was subjected to the vertical direction. The radiation pressure and the photophoresis force provided by the laser are parallel to the axial direction of the light beam, the radiation pressure borne by the absorptive particles deviates from the direction of the light source, and the direction of the photophoresis force is coaxial with the radiation pressure. The absorbing particles are subjected to two kinds of optophoretic forces when irradiated by the laser light, one caused by a temperature gradient and the other caused by different coefficients of thermal adaptation. When the first optical fiber light source 1 is turned on, since the temperature of the background liquid is hardly influenced by the first optical fiber light source 1, only the absorptive particles absorb the laser light to generate a photophoretic force, and two photophoretic forces transmitted between the absorptive particles and the surrounding solution dominate the capturing and axial vibration. For strongly absorbing particles, there is more heat absorption on the illumination side, so a positive phoretic force due to temperature gradients pushes the particles away to areas where the laser power density is high.
In connection with fig. 1, the force of gravity F now is in the vertical directiongBuoyancy FbAnd viscous drag F η, radiation pressure FrpAnd the thermophoresis force is along the horizontal direction, and the left side absorbs heat because the first optical fiber light source 1 irradiates the small ball, so that the temperature difference, namely T, exists between the liquid on the two sides of the small ball1>T2Generating a photophoretic force F caused by a temperature gradient△TThe photophoretic force caused by different thermal adaptation coefficients is F△α，F△T>>F△αCausing the particles to move to the right.
The particle is internally heat exchanged in the moving process to make the temperatures on both sides almost equal, when the temperature difference of liquid between the two sides of the particle is pushed away to be close to 0, the photophoresis force generated by the temperature gradient is basically eliminated, so the photophoresis force caused by different thermal adaptation coefficients is dominant at the moment, the photophoresis force is induced by the heat exchange between the liquid and the particle surface, the direction of the photophoresis force is directed to the direction from the thermal adaptation coefficient to the thermal adaptation coefficient, the force makes the particle move towards the light source direction again depending on the particle structure and the surface characteristics until the photophoresis force generated by the temperature gradient is enhanced to a certain degree again, and then the process is repeated to achieve the vibration effect.
In connection with fig. 2, the force of gravity F now in the vertical directiongBuoyancy FbAnd viscous drag F η, radiation pressure FrpAnd the horizontal direction of the light swimming force, because the heat exchange occurs in the small ball during the movement process, the temperature difference between the two sides of the particle is very small, so that F△TVery small, photophoretic force F due to different coefficients of thermal adaptation△α，F△α>>F△TThe particles are moved to the left and F△TAfter the vibration is large enough, the two processes are repeated to achieve the vibration effect.
When the second optical fiber light source 2 such as 1550nm light source is turned on, unlike the first optical fiber light source 1, the light source in this wavelength band has an influence on the temperature of the solution, so that the thermal adaptation coefficient of the whole solution changes, and the force of the absorptive black ball in the moving direction also changes, that is, the photophoresis force caused by the different thermal adaptation coefficients is F△αChange to occurAlternatively, and in the same way, the combination of the previous analysis can have the effect of controlling the vibration frequency.
Referring to fig. 4, the particles move repeatedly in the two circular dotted lines, the rightward movement speed is V, the leftward movement speed is V', the capturing position can be changed by changing the power of the first fiber light source 1, and the particle vibration amplitude can be changed by changing the power of the second fiber light source 2.
Detailed description of the preferred embodiment 1
As shown in fig. 3, the optical fiber-based optically-driven vibration motor comprises a first optical fiber light source 1, a second optical fiber light source 2, a 980nm-1550nm optical fiber wavelength division multiplexer 3, a 980 single-mode optical fiber 4, a 6 μm absorptive black ball 5 and glycerol 6.
1. Taking a section of single-mode optical fiber 4, wherein the length of the single-mode optical fiber 4 is about 1 meter, stripping a coating layer of the optical fiber at one end of the single-mode optical fiber 4 by 20-30mm, dipping a non-woven fabric into a mixed solution of alcohol and ether, and repeatedly wiping an outer cladding layer of the optical fiber until the optical fiber is cleaned for later use;
2. cutting the end face of the cleaned single-mode optical fiber 4 to be flat by using an optical fiber cutter;
3. removing a coating layer, cleaning and processing a flat end face of a tail fiber of a 980nm laser first optical fiber light source 1, a 1550nm laser second optical fiber light source 2 and an optical fiber wavelength division multiplexer 3 for 980nm and 1550nm laser wavelength ranges by the methods in the steps 1 and 2;
4. and (3) welding an incident end of the optical fiber wavelength division multiplexer 3 with a 980nm first optical fiber light source 1 and a 1550nm second optical fiber light source 2 by using an optical fiber welding machine, and welding an emergent end of the optical fiber wavelength division multiplexer 3 with one end of a standard single mode optical fiber 4 to form an optical fiber optical path system.
5. And fixing the treated tail fiber of the standard single-mode fiber 4 on a three-dimensional precision adjusting displacement platform, and adjusting the standard single-mode fiber 4 to be immersed in the background liquid glycerol with 6-micron black ball absorptive particles. The used absorbing particle black ball is a filler of an electronic device used for a liquid crystal panel of a mobile phone, the inner part of the black ball is composed of silicon dioxide, the outer part of the black ball is wrapped by carbon powder, the particle size is about 6 microns, and the appearance is pure black.
6. Putting the glycerol with the uniformly dispersed absorptive particle black spheres and the standard single-mode fiber 4 tail fiber on an objective table of a microscope, adjusting a three-dimensional displacement platform to find the optical fiber and the absorptive fine particle black spheres in the field of view of the microscope, and finely adjusting the focal length of the microscope to keep the optical fiber and part of the black spheres clear in the field of view.
7. The first optical fiber light source 1 is turned on, the 980nm optical fiber laser is turned on, laser is transmitted through a wavelength division multiplexer and is emitted from a standard single-mode optical fiber pigtail, a three-dimensional adjusting displacement platform is finely adjusted, the optical fiber is kept clear in the visual field of a microscope, finally, an emitted light beam and an absorptive black ball are coaxial and irradiate onto the absorptive black ball, the absorptive particle black ball vibrates in glycerin under the action of the 980nm laser, and the distance from the black ball to the end of the optical fiber can be changed by adjusting the power of the 980nm laser, as shown in fig. 4.
8. Turning on the second fiber optic source 2, 1550nm fiber laser, since glycerol is absorptive to light in the 1550nm band, the temperature of the glycerol matrix, which affects the vibration frequency of the absorptive black sphere therein, can be changed, and thus the vibration frequency of the black sphere can be adjusted by adjusting the power of the 1550nm laser.
Claims (6)
1. An optical drive vibration motor device based on optical fiber, characterized in that: the absorption type optical fiber light source comprises a first optical fiber light source (1), a second optical fiber light source (2), an optical fiber wavelength division multiplexer (3), a single mode optical fiber (4), an absorption black ball (5) and liquid (6), wherein the emergent ends of the first optical fiber light source (1) and the second optical fiber light source (2) are welded with the incident end of the optical fiber wavelength division multiplexer (3), the emergent end of the optical fiber wavelength division multiplexer (3) is welded with one end of the single mode optical fiber (4), the other end of the single mode optical fiber (4) excites a stably distributed Gaussian light field, and the single mode optical fiber (4) is embedded into the liquid (6) with the absorption black ball (5);
for the absorbent particles, the particles are in a balanced state in the vertical direction when stably captured in the liquid under the action of gravity, buoyancy and viscous resistance of the liquid, and the applied viscous resistance is along the vertical direction; the radiation pressure and the photophoresis force provided by the laser are parallel to the axial direction of the light beam, the radiation pressure borne by the absorptive particles deviates from the direction of the light source, and the direction of the photophoresis force is coaxial with the radiation pressure; when the absorptive particles are irradiated by laser, the absorptive particles are acted by two kinds of optophoretic forces, one kind is caused by temperature gradient, and the other kind is caused by different thermal adaptation coefficients; when the first optical fiber light source is started, because the temperature of the background liquid is not influenced by the first optical fiber light source, only the absorptive particles absorb the laser to generate a photophoretic force, and two photophoretic forces transmitted between the absorptive particles and the surrounding solution are used for leading capture and axial vibration; for strongly absorbing particles, there will be more heat absorption on the illuminated side, a positive photophoretic force due to temperature gradients pushes the particles away to areas where the laser power density is high;
in the vertical direction by gravity FgBuoyancy FbAnd viscous resistance F η, and radiation pressure FrpAnd the thermophoresis force is along the horizontal direction, and the left side absorbs heat because the first optical fiber light source 1 irradiates the small ball, so that the temperature difference, namely T, exists between the liquid on the two sides of the small ball1>T2Generating a photophoretic force F caused by a temperature gradient△TThe photophoretic force caused by different thermal adaptation coefficients is F△αThe particles are moved to the right;
the particles are internally subjected to heat exchange in the moving process to enable the temperatures on the two sides to be equal, when the temperature difference between liquid pushing away the particles and the temperatures on the two sides of the particles approaches to 0, the photophoresis force generated by temperature gradient basically disappears, at the moment, the photophoresis force caused by different thermal adaptation coefficients is dominant, the photophoresis force is induced by heat exchange between the liquid and the surfaces of the particles, the direction points to the direction from the thermal adaptation coefficient to the thermal adaptation coefficient, the photophoresis force enables the particles to move towards the light source direction again depending on the particle structure and the surface characteristics until the photophoresis force generated by the temperature gradient is enhanced to a certain degree again, and then the process is repeated to achieve the vibration effect;
in the vertical direction by gravity FgBuoyancy FbAnd viscous resistance F η, and radiation pressure FrpAnd the photophoretic force is F along the horizontal direction and is caused by different thermal adaptation coefficients△αThe particles are moved to the left and F△TThen repeating the above two steps to achieve the vibration effect;
when the second optical fiber light source such as 1550nm light source is turned on, the light source in this band will be at the solution temperatureThe degree is influenced, the thermal adaptation coefficient of the whole solution is changed, and the force of the absorptive black ball in the moving direction is also changed, namely the photophoresis force caused by different thermal adaptation coefficients is F△αThe change takes place, which has the effect of controlling the vibration frequency.
2. An optical fiber-based optically driven vibration motor apparatus as claimed in claim 1, said first fiber optic light source (1) having a stable output wavelength, said output wavelength being the absorption peak of an absorbent black ball and not the absorption peak of a liquid matrix.
3. An optical fiber based optically driven vibration motor apparatus according to claim 1, wherein said second fiber optic light source (2) has a stable output wavelength, the output wavelength being the absorption peak of the liquid matrix.
4. An optical fiber-based optically driven vibration motor apparatus as claimed in claim 1, wherein said single mode fiber (4) is an OFS980 single mode fiber, and the fiber end face is a flat end face.
5. An optical fiber-based optically driven vibration motor apparatus as claimed in claim 1, said absorptive black ball (5) having a diameter in the range of 6-10 μm, absorbing the first optical fiber light source (1) and the second optical fiber light source (2).
6. An optical fiber-based optical drive vibration motor apparatus as claimed in claim 1, wherein said liquid (6) is one of a glycerin mixture solution, a glycol mixture solution and a sucrose mixture solution, and has a density of 950kg/m3～1350kg/m3Within the range of viscosity coefficient of 1 × 10-3m2/s～2×10-3m2In the range of/s.
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| US6897950B2 (en) * | 2002-07-16 | 2005-05-24 | East Carolina University | Laser tweezers and Raman spectroscopy systems and methods for the study of microscopic particles |
| JP4703421B2 (en) * | 2006-02-02 | 2011-06-15 | 株式会社東芝 | Multi-leaf collimator and radiotherapy apparatus provided with the same |
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