CN103869477A - Tunable light wave beam splitter based on fluid light guide - Google Patents
Tunable light wave beam splitter based on fluid light guide Download PDFInfo
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- CN103869477A CN103869477A CN201410037648.6A CN201410037648A CN103869477A CN 103869477 A CN103869477 A CN 103869477A CN 201410037648 A CN201410037648 A CN 201410037648A CN 103869477 A CN103869477 A CN 103869477A
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Abstract
A tunable light wave beam splitter based on a fluid light guide comprises the fluid light guide, an incident laser, a light beam receiving surface and a flowing-out fluid container, wherein the fluid light guide is provided with a passageway which comprises a core layer fluid inlet, two symmetric cover layer fluid inlets, a fluid microcavity and two symmetric fluid outlets, the core layer fluid inlet and the cover layer fluid inlets are all communicated with the inlet side of the fluid microcavity of which the outlet side is connected with the two fluid outlets, the fluid outlets are communicated with the flowing-out fluid container, the incident laser and the light beam receiving surface are arranged coaxially, the axes of the incident laser and the light beam receiving surface are vertical to the flowing direction of fluid, and flow rate adjusting equipment is arranged in the core layer fluid inlet and the cover layer fluid inlets and is connected with a beam splitting control module for controlling the flow rate of the fluid in a core layer and a cover layer to realize light wave beam splitting and splitting ratio control. The tunable light wave beam splitter can realize dynamic tuning and is high in integration level, simple in structure, convenient to manufacture and low in cost.
Description
Technical field
The present invention relates to a kind of integrated-type optical device, especially a kind of tunable optical ripple beam splitter of integrated-type.
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, and the index distribution that conventionally regulates and controls optical medium just can realize the controls such as focusing to incident beam, collimation, deflection, beam splitting easily.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 fluid light wave beam splitter.First utilize diffusion and the convection current in the lower fluid of refractive index of fluid that a kind of refractive index is higher, form a kind of regulate and control the optical waveguide of index distribution, then carry out the splitting ratio of tuned light ripple beam splitter by the index distribution of dynamic regulation optical waveguide.
Existing light wave beam splitter, from device framework point, mainly comprises two kinds, integrated device type and discrete device type; And from device function point, mainly comprise fixing splitting ratio type light wave beam splitter and tunable splitting ratio type light wave beam splitter.The application demand of optical device miniaturization in recent years, high integration, make terminal user more and more favor the light wave beam splitter of integrated-type, therefore the planar type optical waveguide light wave beam splitter based on glass substrate material and Si base material obtained than faster development (such as, utility model patent CN201477227U and CN2625917Y), be mainly used in optical communication and light sensory field.On the other hand, the development of optical communication and light Sensor Network, more and more need light wave beam splitter to there is the dynamically function of tuning beam splitter splitting ratio, to meet network flexibility and the requirement of response user's request fast, the tunable optical ripple beam splitter that sees at present report mainly adopts polarization beam splitting technology, carry out tuning splitting ratio by the phase delay that changes the devices such as wave plate, belong to discrete device type, device architecture very complicated (referring to Chinese invention patent CN102645707A and CN1529425A).Up to now, not yet have integrated-type, tunable optical ripple beam splitter sees report, for meeting the active demand of application, the present invention proposes a kind of Novel light wave beam splitter that combines integrated-type and tunable function, i.e. the tunable optical ripple beam splitter based on optical waveguide.
Summary of the invention
For overcome existing light wave beam splitter complex structure, make difficulty, regulation and control very flexible, deficiency that integrated level is not high, the invention provides the tunable optical ripple beam splitter based on optical waveguide that a kind of capable of dynamic is tuning, integrated level is high, simple in structure, easy to make, with low cost.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of tunable optical ripple beam splitter based on optical waveguide, comprise optical waveguide, incident laser device, light beam receiving plane and effluent fluid reservoir, on described optical waveguide, 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 is vertical with fluid flow direction, in described sandwich layer fluid intake and covering fluid intake, install in order to regulate the velocity of flow adjust equipment of fluid velocity, described velocity of flow adjust equipment and control sandwich layer fluid is connected to realize the beam splitting control module of light wave beam splitting and splitting ratio control with covering rate of flow of fluid,
Only there is each other diffusion and convective motion in described sandwich layer fluid and covering fluid, covering fluid ring is 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.
Further, described velocity of flow adjust equipment is the peristaltic pump that injects fluid, certainly, also can adopt other velocity of flow adjust equipment.
Further again, described covering fluid refractive index is higher than described sandwich layer fluid refractive index.
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 principal element that affect two kinds of diffuse fluid and convection process also and then affect optical waveguide index distribution comprises the selection of flow velocity and the different refractivity microfluid of sandwich layer and covering fluid.If rate of flow of fluid is lower in time-limited micro-raceway groove, 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.Further, from the gradual index lens based on micro-fluidic optical technology was different in the past, allow covering fluid refractive index higher than sandwich layer fluid refractive index, form index distribution central concave, and carry out light wave beam splitting with this.Therefore, not only can effectively control the space distribution of diffuse fluid concentration and refractive index by controlling the flow velocity of sandwich layer fluid and covering fluid and type of fluid, can also control beam splitting and the splitting ratio of light wave.
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, realize tunable optical wavelength-division bundle, and splitting ratio can regulate online in real time; 2, the tunable optical ripple beam splitter based on optical waveguide by invention, can build a kind of Novel light wave beam splitting device that has integration and tunable function concurrently; 3, direction of beam propagation, perpendicular to fluid flow direction, effectively reduces the propagation loss of light beam; 4,, compared with light wave beam splitter in the past, have advantages of that capable of dynamic is tuning, integrated level is high, simple in structure, easy to make, with low cost.Brief description of the drawings
Fig. 1 is the schematic diagram that the present invention is based on the tunable optical ripple beam splitter of optical waveguide.
Fig. 2 is the cavity schematic diagram that the present invention is based on optical waveguide carrying microfluid in the tunable optical ripple beam splitter of optical waveguide.
Fig. 3 is in different in flow rate situation, along the index distribution of fluid flow direction center cross-section (being laser beam incident place).
Fig. 4 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. 5 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.
Fig. 6 changes a side covering rate of flow of fluid, the skew distributing along the concave reflectivity optial of fluid flow direction center cross-section (being laser beam incident place).
Fig. 7 changes the caused splitting ratio of a side covering rate of flow of fluid Q1 to change schematic diagram, (a) Q
1=500pL/s; (b) Q
1=1000pL/s; (c) Q
1=2500pL/s; (d) Q
1=5000pL/s; (e) Q
1=10000pL/s.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1～Fig. 7, a kind of tunable optical ripple beam-splitting method based on optical waveguide, this beam-splitting method adopts the tunable optical ripple beam splitter based on optical waveguide, described tunable optical ripple beam splitter comprises optical waveguide 1, incident laser device 2, light beam receiving plane 3 and effluent fluid reservoir 4, on described optical waveguide 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 is vertical with fluid flow direction, described sandwich layer fluid intake 5 and the interior installation of covering fluid intake 6 are in order to regulate the velocity of flow adjust equipment of fluid velocity, described velocity of flow adjust equipment and control sandwich layer fluid is connected to realize the beam splitting control module of light wave beam splitting and splitting ratio control with covering rate of flow of fluid,
Only there is each other diffusion and convective motion in described sandwich layer fluid and covering fluid, covering fluid ring is 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.
Further, described velocity of flow adjust equipment is the peristaltic pump that injects fluid, certainly, also can adopt other velocity of flow adjust equipment.
Further again, described covering fluid refractive index is higher than described sandwich layer fluid refractive index.
Tunable optical ripple beam splitter described in the present embodiment, the method that realizes light wave beam splitting 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 is vertical with fluid flow direction, and described light beam receiving plane receives the light beam of exporting after optical waveguide;
(3) by selecting microfluid kind, control the refractive index of described sandwich layer fluid lower than the refractive index of described covering fluid;
(4) by regulating rate of flow of fluid, control the space distribution of diffuse fluid process and refractive index, realize light wave beam splitting.
In the present embodiment, in described step (3), by selecting the kind of sandwich layer fluid and covering fluid, and in described step (4), can effectively control the process of diffusion and convection current by controlling the flow velocity of sandwich layer fluid and covering fluid, thereby control the space distribution of diffuse fluid and refractive index; Specific as follows:
1) impact that flow velocity refractive index distributes, keep other parameter constants, select along the index distribution of fluid flow direction center cross-section (being laser beam incident place) as a reference, to draw the impact that rate of flow of fluid distributes on waveguide index, as shown in Figure 3, (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.
2) 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 4.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.
3) 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 5.As can be seen from Figure 5, 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.
4) flow velocity of dynamic adjustments covering fluid, can realize the adjustable continuously of light beam splitting ratio.Keep a side covering fluid and the constant Q of sandwich layer rate of flow of fluid
c=Q
2=2500pL/s, by regulating Q
1realize the skew of central concave refractive index.Fig. 6 has provided and has worked as Q
1during for 500pL/s, 1000pL/s, 2500pL/s, 5000pL/s and 10000pL/s, the refractive index distribution curve of optical waveguide.Can find out, the central concave position of index distribution is along with a side covering rate of flow of fluid Q
1variation and be offset, simultaneously the refractive index size of both sides, central concave position also changes thereupon, accordingly the splitting ratio of tuning outgoing beam dynamically.As shown in Figure 7 (a), work as Q
1during for 500pL/s, central dip in refractive index position deviation axis-23 μ m, supposes that input optical power is 1, and splitting ratio is 0.35:0.65; As shown in Figure 7 (b) shows, work as Q
1when=1000pL/s, central dip in refractive index position deviation axis-15 μ m, splitting ratio is 0.4:0.6; As shown in Fig. 7 (c), work as Q
1when=2500pL/s, equate with opposite side covering rate of flow of fluid and sandwich layer rate of flow of fluid, at this moment central dip in refractive index position is without departing from, and splitting ratio is 0.5:0.5; As shown in Fig. 7 (d), in the time of Q1=5000pL/s, central dip in refractive index position deviation axis 14 μ m, splitting ratio is 0.59:0.41; As shown in Fig. 7 (e), work as Q
1when=10000pL/s, central dip in refractive index position deviation axis 28 μ m, splitting ratio is 0.69:0.31.
Claims (3)
1. the tunable optical ripple beam splitter based on optical waveguide, comprise optical waveguide, incident laser device, light beam receiving plane and effluent fluid reservoir, on described optical waveguide, 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 is vertical with fluid flow direction, in described sandwich layer fluid intake and covering fluid intake, install in order to regulate the velocity of flow adjust equipment of fluid velocity, the flow velocity of described velocity of flow adjust equipment and control sandwich layer fluid and covering fluid is to realize the beam splitting of light wave and the beam splitting control module of splitting ratio control is connected,
Only there is each other diffusion and convective motion in described sandwich layer fluid and covering fluid, covering fluid ring is 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. the tunable optical ripple beam splitter based on optical waveguide as claimed in claim 1, is characterized in that: described velocity of flow adjust equipment is the peristaltic pump that injects fluid, certainly, also can adopt other velocity of flow adjust equipment.
3. the tunable optical ripple beam splitter based on optical waveguide as claimed in claim 1 or 2, is characterized in that: described covering fluid refractive index is higher than described sandwich layer fluid refractive index.
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| CN104932109A (en) * | 2015-06-08 | 2015-09-23 | 浙江工业大学 | One-dimensional tunable light beam direction regulation and control method based on fluid optical waveguide |
| 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 |
| CN113115967A (en) * | 2021-04-21 | 2021-07-16 | 淮阴工学院 | Food processing equipment capable of being accurately controlled and processing method thereof |
| CN113687506A (en) * | 2021-07-06 | 2021-11-23 | 中国地质大学（武汉） | Micro-fluidic-based adjustable light beam splitter |
| CN115291320A (en) * | 2022-07-27 | 2022-11-04 | 常熟市第二人民医院 | Micro-fluidic optical fiber type adjustable light guide |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| 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 |
| CN113115967A (en) * | 2021-04-21 | 2021-07-16 | 淮阴工学院 | Food processing equipment capable of being accurately controlled and processing method thereof |
| CN113687506A (en) * | 2021-07-06 | 2021-11-23 | 中国地质大学（武汉） | Micro-fluidic-based adjustable light beam splitter |
| CN113687506B (en) * | 2021-07-06 | 2023-04-11 | 中国地质大学（武汉） | Micro-fluidic-based adjustable light beam splitter |
| CN115291320A (en) * | 2022-07-27 | 2022-11-04 | 常熟市第二人民医院 | Micro-fluidic optical fiber type adjustable light guide |
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