CN103792665A - Beam shaping device based on microfluidic optical technology - Google Patents

Beam shaping device based on microfluidic optical technology Download PDF

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Publication number
CN103792665A
CN103792665A CN201410037622.1A CN201410037622A CN103792665A CN 103792665 A CN103792665 A CN 103792665A CN 201410037622 A CN201410037622 A CN 201410037622A CN 103792665 A CN103792665 A CN 103792665A
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fluid
incident laser
light beam
optical waveguide
light
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CN201410037622.1A
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Chinese (zh)
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乐孜纯
孙运利
王昌辉
付明磊
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

A beam shaping device based on the microfluidic optical technology comprises a fluid optical waveguide body, an incident laser, a beam receiving face and a flow-out fluid storage device, wherein a channel used for carrying micro fluid is formed in the fluid optical waveguide body, the channel comprises a core layer fluid inlet, two symmetrical cladding fluid inlets, a fluid micro cavity and two symmetrical fluid outlets, both the core layer fluid inlet and the cladding fluid inlets are connected with the inlet side of the fluid micro cavity, the outlet side of the fluid micro cavity is connected with the two fluid outlets, the fluid outlets are communicated with the flow-out fluid storage device, the incident laser and the beam receiving face are coaxially arranged, the axis of the incident laser and the beam receiving face are intersected with the axis of the moving direction of the fluid, the incident laser and the beam receiving face are symmetrically placed with the intersected point as the center of symmetry, and the included angle between the beam propagation direction and the flowing direction of the fluid is 90+/-10 degrees. The beam shaping device is small in loss in light propagation process, simplified in structure, convenient to manufacture and good in adjustment and control flexibility.

Description

Based on the light-beam forming unit of micro-fluidic optical technology
Technical field
The present invention relates to optical device and detection system field, especially a kind of light-beam forming unit.Background technology
The shaping technique of light beam has comprised the regulation and control such as focusing to light beam, collimation, deflection, beam splitting, coupling, conventionally utilize the specific inductive capacity of regulation and control optical medium and magnetic permeability distributes and and then change external electromagnetic field and distribute to realize, just can realize easily the controls such as focusing to incident beam, collimation, deflection, beam splitting such as the regulation and control of the index distribution to optical device.Fast-developing micro-fluidic optical technology is for we provide the new method of beam shaping in recent years, and its principle is to flow to realize the control to light micro-scale by controlling fluid.Given this, microflow control technique and system can be introduced in the designing and making of controllable refractive index optical waveguide.If the fluid that a kind of refractive index is higher can spread in the lower fluid of refractive index, and can realize a kind of stable distribution in the process of diffusion, in the process of diffuse fluid and convection current, will present regulatable index distribution so, such as, on base material, utilize lithographic technique to make microfluid raceway groove, coordinate with constant current fluid means, just can realize microfluid graded index distribution lens (the Mao X based on convection current and diffusional effect, Lin SS, Lapsley MI, Shi J, Juluri BK, Tunable liquid gradient refractive index (L-GRIN) lens with two degrees of freedom, Lab.Chip., 9 (2009): 2050-2058, there is the tunable liquid gradual index lens of 2 degree of freedom regulating powers, laboratory on sheet, 9 (2009): 2050-2058, Yang Y, Liu AQ, Chin LK, Zhang XM, Tsai DP, Lin CL, Lu C, Wang GP, Zheludev NI, Optofluidic waveguide as a transformation optics device for lightwave bending and manipulation, Nat.Commun., 3 (2012): 651-657, for the bending transfer optics based on light stream control waveguide with controlling of light wave, nature-communication, 3 (2012): 651-657).Utilize micro-fluidic optical technology to realize the dynamic shaping of light beam, the beam shaping method based on micro-fluidic optical technology, and fluid optical waveguide structure based on the method is the Key technique problem that must solve.
Summary of the invention
In order to overcome, the light communication process loss of existing beam shaping method is large, the deficiency of complex structure, making difficulty, regulation and control very flexible, the invention provides that a kind of smooth communication process loss is little, designs simplification, easy to make, the regulation and control dirigibility light-beam forming unit based on micro-fluidic optical technology preferably.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of light-beam forming unit based on micro-fluidic optical technology, comprise optical waveguide main body, incident laser device, light beam receiving plane and effluent fluid reservoir, in described optical waveguide main body, have the runner for carrying microfluid, described runner comprises a sandwich layer fluid intake, two symmetrical covering fluid intakes, fluid microcavity and two symmetrical fluid egress points, described sandwich layer fluid intake, covering fluid intake is all communicated with the entrance side of described fluid microcavity, the outlet side of described fluid microcavity is connected with two fluid egress points, described fluid egress point is communicated with effluent fluid reservoir, described incident laser device and described light beam receiving plane are coaxially arranged, the axis of described incident laser device and described light beam receiving plane and fluid flow direction axes intersect, described incident laser device and described light beam receiving plane be symmetrical placement take joining as symcenter, the laser beam incident of setting wavelength is arrived described optical waveguide by described incident laser device, direction of beam propagation and fluid flow direction are 90 ° ± 10 °, described light beam receiving plane receives the light beam of exporting after optical waveguide.
Further, described direction of beam propagation is perpendicular to fluid flow direction, and light beam receiving plane is coaxial with incident laser device.
Described light-beam forming unit also comprises the peristaltic pump that injects fluid, the peristaltic pump of described injection fluid is positioned at sandwich layer fluid intake, covering fluid intake, realize the adjusting of the flow velocity of convection cell by controlling peristaltic pump, and realize the adjusting of the temperature of convection cell by controlling peristaltic pump.
Technical conceive of the present invention is: utilize and form the sandwich layer of optical waveguide and the diffusion of two kinds of fluids of covering and convection process dynamic regulation waveguide index, the factor that affects two kinds of diffuse fluid and convection process is a lot, such as selected, optical waveguide agent structure and the size of temperature, concentration, flow velocity and microfluid kind, and and then affect index distribution.If rate of flow of fluid is very high in time-limited micro-raceway groove, the diffusion of sandwich layer fluid is limited, and at this moment convection effect is occupied an leading position, and now optical waveguide can be similar to and regard step-refraction index distribution (perpendicular to fluid flow direction) waveguiding structure as; And when rate of flow of fluid lower, diffusional effect is obvious, be now the cross-sectional direction of microcavity or all will consider the impact of diffusional effect on concentration gradient along fluid flow direction, and the diffusion of sandwich layer fluid in the covering fluid theoretical foundation that graded index optical waveguide can be realized just.Therefore, can effectively control the process of diffusion and convection current by flow velocity and the type of fluid of controlling sandwich layer fluid and covering fluid, thereby control the space distribution of diffuse fluid concentration and refractive index.
Beneficial effect of the present invention is mainly manifested in: 1, the beam shaping method based on micro-fluidic optical technology, form fluid optical waveguide structure with the convection current between two kinds of fluids and diffusion process, by controlling flow velocity and the type of fluid of sandwich layer and covering fluid, can obtain flexible and changeable index distribution; 2, by the optical waveguide of invention based on micro-fluidic optical technology, can build to light beam focus on, the new device of the function such as collimation, beam splitting, deflection; 3, realized the dynamically adjustable and belong to online and regulate in real time of light beam focusing, beam splitting, deflection; 4, direction of beam propagation, perpendicular to fluid flow direction, effectively reduces the propagation loss of light beam.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the present invention is based on the light-beam forming unit of micro-fluidic optical technology.
Fig. 2 is the cavity schematic diagram that the present invention is based on optical waveguide main body carrying microfluid in the light-beam forming unit of micro-fluidic optical technology.
Fig. 3 is the index distribution of optical waveguide of the present invention along fluid flow direction varying cross-section place.
Fig. 4 is in different in flow rate situation, along the index distribution of fluid flow direction center cross-section (being laser beam incident place).
Fig. 5 is when in the different situation of both sides covering flow velocity, changes a side covering rate of flow of fluid, along the index distribution of fluid flow direction center cross-section (being laser beam incident place).
Fig. 6 is covering fluid refractive index during higher than sandwich layer fluid refractive index, and optical waveguide index distribution is with the variation of flow velocity.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1~Fig. 6, a kind of beam shaping method based on micro-fluidic optical technology, this shaping methods adopts the light-beam forming unit based on micro-fluidic optical technology, described light-beam forming unit comprises optical waveguide main body 1, incident laser device 2, light beam receiving plane 3 and effluent fluid reservoir 4, in described optical waveguide main body 1, have the runner for carrying microfluid, described runner comprises a sandwich layer fluid intake 5, two symmetrical covering fluid intakes 6, fluid microcavity 7 and two symmetrical fluid egress points 8, described sandwich layer fluid intake 5, covering fluid intake 6 is all communicated with the entrance side of described fluid microcavity 7, the outlet side of described fluid microcavity 7 is connected with two fluid egress points 8, described fluid egress point 8 is communicated with effluent fluid reservoir 4, described incident laser device 2 and described light beam receiving plane 3 are coaxially arranged, the axis of described incident laser device and described light beam receiving plane and fluid flow direction axes intersect, described incident laser device and described light beam receiving plane be symmetrical placement take joining as symcenter, the laser beam incident of setting wavelength is arrived described optical waveguide by described incident laser device, direction of beam propagation and fluid flow direction are 90 ° ± 10 °, described light beam receiving plane receives the light beam of exporting after optical waveguide.
Further, described direction of beam propagation is perpendicular to fluid flow direction, and light beam receiving plane is coaxial with incident laser device.
Described light-beam forming unit also comprises the peristaltic pump that injects fluid, the peristaltic pump of described injection fluid is positioned at sandwich layer fluid intake, covering fluid intake, realize the adjusting of the flow velocity of convection cell by controlling peristaltic pump, and realize the adjusting of the temperature of convection cell by controlling peristaltic pump.
The light-beam forming unit of the present embodiment, the beam shaping method of realization comprises the following steps:
(1) only there is each other diffusion and convective motion (chemical reaction does not occur each other for sandwich layer fluid and covering fluid) in described sandwich layer fluid and covering fluid, covering fluid is balancedly around sandwich layer fluid, described sandwich layer fluid and covering fluid are two kinds of fluids with different refractivity, described sandwich layer fluid and covering fluid flow in fluid microcavity, jointly form optical waveguide;
(2) described incident laser device is by the laser beam incident of setting wavelength to described optical waveguide, and direction of beam propagation and fluid flow direction are 90 ° ± 10 °, and described light beam receiving plane receives the light beam of exporting after optical waveguide;
(3) by regulating rate of flow of fluid, temperature, concentration, microfluid kind, control the space distribution of diffuse fluid process and refractive index, realize beam shaping.
In the present embodiment, in described step (3), can effectively control the process of diffusion and convection current by flow velocity and the type of fluid of controlling sandwich layer fluid and covering fluid, thereby control the space distribution of diffuse fluid and refractive index; Specific as follows:
1) index distribution of optical waveguide varying cross-section, supposes that the coefficient of diffusion in sandwich layer fluid and the convection current of covering fluid and diffusion process is constant (1 × 10 -9m 2/ s), set peristaltic pump control parameter, make covering identical with the flow velocity of sandwich layer fluid (being all 2500pL/s), and allow along the diffusion effect of flow direction and vertical fluid direction all obvious, draw along the index distribution of the cross-section of fluid flow direction diverse location, as shown in Figure 3, index distribution is along with away from fluid intake, and refractive index distribution curve is gradually mild.The most direct effect of this index distribution is exactly to regulate and control the focal length of the laser beam of vertical incidence.
2) impact that flow velocity refractive index distributes, the impact distributing for the refractive index of Study of Fluid flow velocity, keep other parameter constants, select along the index distribution of fluid flow direction center cross-section (being laser beam incident place) as a reference, draw the impact that rate of flow of fluid distributes on waveguide index, as shown in Figure 4, (Q when flow velocity is lower 1=Q 2=Q c=1000pL/s), index distribution is milder, (Q when flow velocity is higher 1=Q 2=Q c=5000pL/s), index distribution is more sharp-pointed.This variation can reach adjusting index distribution by adjusting flow velocity in the constant situation of light-beam position, thereby realizes adjustable continuously that light beam is assembled, i.e. the dynamically shaping continuously to light beam.
3) impact that the different refractive index of both sides covering flow velocity distribute, condition previously discussed is sandwich layer flow velocity and the situation of the identical flow velocity of both sides covering, the result that this flow conditions obtains is the center of refractive index center at fluid microcavity.If keep the covering fluid of a side constant, change opposite side covering rate of flow of fluid, can regulate more neatly the index distribution of optical waveguide, obtain along the asymmetric index distribution of optical axis, and then can regulate and control the deflection of light beam.Same selection along the index distribution of fluid flow direction center cross-section (being laser beam incident place) as a reference, keeps Q c=Q 2=2500pL/s, changes Q 1, a side covering and sandwich layer constant flow rate are 2500pL/s, opposite side covering flow velocity has been chosen respectively 500pL/s, 1500pL/s, 2500pL/s, 5000pL/s and 10000pL/s index distribution center at this moment and has been changed to 28 μ m from-25 μ m, as shown in Figure 5.The variation of this space refractive index shift the most directly affects on light the focus deflection that can realize exactly light beam, and deflection angle is along with the variation of covering flow velocity is adjustable continuously.
4) impact that covering fluid refractive index distributes higher than sandwich layer fluid refractive index convection cell fiber waveguide refractive index, when covering fluid adopts the higher dilute solution of ethylene glycol of refractive index, sandwich layer fluid adopts the lower deionized water of refractive index, keeps sandwich layer and covering rate of flow of fluid to equate simultaneously.In the time of continuous setup rate of flow of fluid size, draw along the index distribution of fluid flow direction center cross-section (being laser beam incident place), as shown in Figure 6.As can be seen from Figure 6, there is central concave in index distribution, and it is on the beam splitting device of light beam that this distribution is the most simply applied, and in beam splitting, realized the focusing of light beam.In addition, the flow velocity of dynamic adjustments covering fluid, for example Fig. 6 lower left curve has shown Q 1=10000pL/s, Q c=Q 2index distribution when=2500pL/s, can realize the adjustable continuously of light beam splitting ratio.
5) impact that temperature, concentration, microfluid kind convection cell fiber waveguide refractive index distribute, the impact that described temperature variation convection cell fiber waveguide refractive index distributes, the rising that shows sandwich layer and covering fluid temperature (F.T.) greatly (for example becomes coefficient of diffusion, when sandwich layer fluid adopts the ethylene glycol solution that massfraction is 0.8, when temperature changes to 50 ° of C from 30 ° of C, change in diffusion coefficient is from 3.19 × 10 -10m 2/ s changes to 4.63 × 10 -10m 2/ s), and then make the refractive index distribution curve of optical waveguide milder; Described temperature variation is consistent on sandwich layer fluid with the impact of covering fluid.The impact that described concentration change convection cell fiber waveguide refractive index distributes, the higher coefficient of diffusion of concentration is less, and (for example,, in the time that ethylene glycol and deionized water concentration ratio are between 0.0250-0.950, the variation range of coefficient of diffusion is 9.28 × 10 -10m 2/ s to 1.67 × 10 -10m 2between/s), and then make the refractive index distribution curve of optical waveguide more sharp-pointed; Described concentration change is consistent on sandwich layer fluid with the trend of the impact of covering fluid, but can regulate and control separately.The impact that described microfluid kind convection cell fiber waveguide refractive index distributes, show that different microfluids have the different coefficients of viscosity, viscosity resistance between fluid microcavity walls and fluid exerts an influence to microfluid diffusion process, near the position of fluid microcavity walls, fluid rate is less than the flow velocity of microcavity center, the regional diffusion that flow velocity reduces is more obvious, and therefore, with respect to the refractive index distribution curve of center, the index distribution of edge is relatively level and smooth.

Claims (3)

1. the light-beam forming unit based on micro-fluidic optical technology, it is characterized in that: comprise optical waveguide main body, incident laser device, light beam receiving plane and effluent fluid reservoir, in described optical waveguide main body, have the runner for carrying microfluid, described runner comprises a sandwich layer fluid intake, two symmetrical covering fluid intakes, fluid microcavity and two symmetrical fluid egress points, described sandwich layer fluid intake, covering fluid intake is all communicated with the entrance side of described fluid microcavity, the outlet side of described fluid microcavity is connected with two fluid egress points, described fluid egress point is communicated with effluent fluid reservoir, described incident laser device and described light beam receiving plane are coaxially arranged, the axis of described incident laser device and described light beam receiving plane and fluid flow direction axes intersect, described incident laser device and described light beam receiving plane be symmetrical placement take joining as symcenter, the laser beam incident of setting wavelength is arrived described optical waveguide by described incident laser device, direction of beam propagation and fluid flow direction are 90 ° ± 10 °, described light beam receiving plane receives the light beam of exporting after optical waveguide.
2. the light-beam forming unit based on micro-fluidic optical technology as claimed in claim 1, is characterized in that: described direction of beam propagation is perpendicular to fluid flow direction, and light beam receiving plane is coaxial with incident laser device.
3. the light-beam forming unit based on micro-fluidic optical technology as claimed in claim 1 or 2, is characterized in that: described light-beam forming unit also comprises the peristaltic pump that injects fluid, the peristaltic pump of described injection fluid is positioned at sandwich layer fluid intake, covering fluid intake.
CN201410037622.1A 2014-01-26 2014-01-26 Beam shaping device based on microfluidic optical technology Pending CN103792665A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105044804A (en) * 2015-06-08 2015-11-11 浙江工业大学 Fluid microlens with free adjustable light beam direction along two dimensions
CN105319645A (en) * 2015-05-26 2016-02-10 湖南师范大学 Waveguide dimmable power splitter on the basis of microfluidics technology

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Publication number Priority date Publication date Assignee Title
CN101558332A (en) * 2006-11-07 2009-10-14 康宁股份有限公司 Multi-fluid lenses and optical devices incorporating the same
US20110013287A1 (en) * 2009-07-15 2011-01-20 The Penn State Research Foundation Tunable Liquid Gradient Refractive Index Lens Device
CN102841443A (en) * 2011-06-24 2012-12-26 北京大学 Digital adjustable micromirror chip on basis of microfluidics and preparation method thereof
CN103282766A (en) * 2010-11-19 2013-09-04 加利福尼亚大学董事会 Hybrid, planar optofluidic integration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101558332A (en) * 2006-11-07 2009-10-14 康宁股份有限公司 Multi-fluid lenses and optical devices incorporating the same
US20110013287A1 (en) * 2009-07-15 2011-01-20 The Penn State Research Foundation Tunable Liquid Gradient Refractive Index Lens Device
CN103282766A (en) * 2010-11-19 2013-09-04 加利福尼亚大学董事会 Hybrid, planar optofluidic integration
CN102841443A (en) * 2011-06-24 2012-12-26 北京大学 Digital adjustable micromirror chip on basis of microfluidics and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105319645A (en) * 2015-05-26 2016-02-10 湖南师范大学 Waveguide dimmable power splitter on the basis of microfluidics technology
CN105319645B (en) * 2015-05-26 2018-07-20 湖南师范大学 A kind of waveguide type adjustable light power beam splitter based on microflow control technique
CN105044804A (en) * 2015-06-08 2015-11-11 浙江工业大学 Fluid microlens with free adjustable light beam direction along two dimensions

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