CN105911682A - Device and method for controlling three-dimensional polarization direction of microobjective focused light field - Google Patents
Device and method for controlling three-dimensional polarization direction of microobjective focused light field Download PDFInfo
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Abstract
The invention discloses a device and a method for controlling a three-dimensional polarization direction of a microobjective focused light field. The device comprises a beam splitting module, a polarization rotation module, a radial polarized light converter and a beam combiner, wherein the beam splitting module is used for splitting incident coherent linearly polarized light into two beams of linearly polarized light and regulating a light intensity ratio; the polarization rotation module is used for controlling the polarization direction of a first beam of polarized light; the radial polarized light converter is used for converting a second beam of polarized light into radial polarized light; the beam combiner is used for combining emergent linearly polarized light and radial polarized light into coaxial light beams. According to the method disclosed by the invention, an included angle between a focused light field polarization direction and a focusing plane is controlled by regulating a light intensity proportion of the first beam of polarized light and the second beam of polarized light obtained by beam splitting by utilizing the beam splitting module; and a projected direction of the focused light field polarization direction in the focusing plane is controlled by changing a polarization direction of the first linearly polarized light by utilizing the polarization rotation module. The device disclosed by the invention is simple in structure, stable, reliable, high in applicability, easy to realize and easy to operate and has excellent applicability.
Description
Technical field
The present invention relates to a kind of microcobjective that controls and focus on the apparatus and method in light field three-dimensional polarization direction, belong to light field three-dimensional polarization
Control technical field.
Background technology
Polarize as a fundamental characteristics of light, with intensity, phase place is the same can provide detection contrast, thus in optical detection,
Very important application is had especially in optical microphotograph field.Such as, differentiate and in some industrial micro-fields at mineral products, polarization
Be introduced in microtechnique for enhancing contrast ratio (Kuai Lijun, Zhan Xiuchun, Fan Xingtao, Wen Hongli, Yuan Jihai. resonance energy
Copper-lead zinc [J] in dispersive x-ray fluorescence spectrum method for measuring sulfide ore. rock and mineral testing, 32 (6), 903-908)；And glimmering
Light technical field of microscopy, the micro-skill of the fluorescence polarization sensitivity of exciting light polarization direction developed based on fluorescence molecule absorption efficiency
Art, by utilizing the light in different polarization direction excite fluorescence molecule and detect the fluorescence light of process stimulated luminescence modulation of polarization direction
By force, can obtain by fluorescence molecule institute labelling biomolecule direction structure, thus biomolecule fluorescence imaging is very helpful
(Kampmann M,Atkinson C E,Mattheyses A L,Simon SM.Mapping the orientation of nuclear
pore proteins in living cells with polarized fluorescence microscopy[J].Nature Structural and
Molecular Biology,2011June,18(6):643–649)。
Except in micro-field, focus on the deflection characteristic of light field quantum information, near field optic, optical micro-manipulation single molecular imaging,
Also there is important application in the fields such as optical storage.And above-mentioned technology all relies on microcobjective and focuses on the regulation and control of light field yawing moment.
Control currently, with respect to microcobjective focusing light field polarization direction focuses primarily upon the control of two dimension polarization direction, causes above-mentioned
The application of technology has limitation.Therefore, Three dimensions control method and the light path of research microcobjective focusing light field polarization direction has
Important value.Around this direction, carry out some correlational studyes both at home and abroad at present, be roughly divided into two kinds of methods.
First method is intensity and the PHASE DISTRIBUTION utilizing spatial filter modulation input light field, realizes microcobjective and focuses on light
The three-dimensional polarization of field controls (Ayman F.Abouraddy and Kimani C.Toussaint, Jr.Three-Dimensional
Polarization Control in Microscopy[J].Physical Review Letters,2006,96(15):153901)。
Second method then uses phase-plate to adjust radially polarisation and tangential polarisation phase place, and it is relevant to utilize object lens to be converged by two-beam
Superposition realizes three-dimensional polarization control (Yunshan Jiang, CuifangKuang, Shuai Li and Xu Liu.Arbitrary
three-dimensional polarization control based on cylindrical vector beams and binary phase
coding[J].Journal of Modern Optics,2014,61(4):328-334)。
In above two method, first method is required for individually calculating intensity for each different three-dimensional polarization direction
And PHASE DISTRIBUTION, calculating complexity, the suitability is poor；Second method controls polarization direction, phase-modulation by phase-modulation
Stability and veracity all compares difficult control in actual light path, has practical limitation.
Summary of the invention
The technical problem to be solved is: provide a kind of control microcobjective focus on light field three-dimensional polarization direction device and
Method, it is achieved microcobjective focuses on the control in light field three-dimensional polarization direction, simple in construction, be prone to adjust, the suitability is good, light path
Reliable and stable.
The present invention solves above-mentioned technical problem by the following technical solutions:
A kind of microcobjective that controls focuses on the device in light field three-dimensional polarization direction, including beam splitting module, polarization rotary module, radially
Polarization converter and bundling device；
Described beam splitting module is for being divided into two bunch polarized light by incident phase mains polarized light, and regulates between two bunch polarized light
Beam intensity ratio；
Polarization rotary module polarization direction of the first bunch polarized light after controlling beam splitting；
Radial polarisation photoconverter is for being converted to radial polarisation light by the second bunch polarized light after beam splitting；
Bundling device is for by inclined to the line polarized light through polarization rotary module outgoing and the radial direction obtained after radial polarisation transducer is changed
The light that shakes is combined into coaxial beam, incident microcobjective.
As a kind of scheme further of apparatus of the present invention, this device also includes that phase compensator, described phase compensator are adjustable
The optical prism of light path, after being positioned at beam splitting in the light path of the most a branch of line polarized light, makes two bunch polarized light after beam splitting close bundle
Time phase contrast be 0 or π.
As a kind of preferred version of apparatus of the present invention, described beam splitting module includes half-wave plate and polarization beam splitter prism；Described half-wave
Sheet is for changing the polarization direction of incident phase mains polarized light；Polarization beam splitter prism is for being divided into by the line polarized light of half-wave plate
The orthogonal two bunch polarized light in polarization direction.
As a kind of preferred version of apparatus of the present invention, described polarization rotary module includes that quarter-wave plate and line polarized light are polarized
Device；Described quarter-wave plate is for being converted to circularly polarized light by line polarized light the most a branch of after beam splitting；The line polarized light polarizer is used
In circularly polarized light being converted to the line polarized light that polarization direction is consistent with line polarized light polarizer axis of homology direction.
As a kind of preferred version of apparatus of the present invention, described bundling device is beam cementing prism.
A kind of method controlling microcobjective focusing light field three-dimensional polarization direction, comprises the steps:
Step 1, utilizes beam splitting module that incidence phase mains polarized light is divided into two bunch polarized light, and polarization rotary module changes first
Outgoing behind the polarization direction of bunch polarized light, radial polarisation photoconverter goes out after the second bunch polarized light is converted to radial polarisation light
Penetrating, two bundle emergent lights are combined into incidence microcobjective after coaxial beam by bundling device, converge two bundle outgoing focusing on light field microcobjective
Light, wherein, line polarized light keeps its polarization direction in focussing plane, and keeps the polarization direction before its incident microcobjective,
And radial polarisation light produces the vertically polarized light of vertical focusing plane, the polarized component coherent superposition of two different directions produces three-dimensional
Polarized light；
Step 2, utilizes the incident phase mains polarized light of beam splitting module regulation the first bunch polarized light after beam splitting and the second bunch inclined
Shake the light intensity ratio of light, control microcobjective and focus on light field in focussing plane and the ratio of vertical focusing in-plane polarized component
Example, thus control the angle focusing on light field polarization direction with focussing plane；
Step 3, the polarization direction utilizing polarization rotary module to rotate described first bunch polarized light controls to focus on light field and is focusing on
The direction of polarized component in plane, thus control microcobjective and focus on light field polarization direction in the direction of focussing plane inner projection.
As a kind of preferred version of the inventive method, described step 2 method particularly includes: by rotating half-wave in beam splitting module
The quick shaft direction of sheet, changes the polarization direction of incident phase mains polarized light, by two bunch obtained after polarization beam splitter prism beam splitting
Polarized light light intensity ratio changes the most therewith.
As a kind of preferred version of the inventive method, described step 3 method particularly includes: by rotatory polarization rotary module
The quick shaft direction of the line polarized light polarizer changes the polarization direction of emergent ray polarized light.
The present invention uses above technical scheme compared with prior art, has following technical effect that
1, the present invention controls microcobjective and focuses on the device in light field three-dimensional polarization direction, simple in construction, reliable and stable, the suitability be strong,
It is easily achieved.
2, the present invention controls the method that microcobjective focuses on light field three-dimensional polarization direction, simply need not the calculating of complexity, by adjusting
Half-wave plate and the direction of polaroid in whole light path can obtain the three-dimensional polarization light focusing on light field any direction, and apparatus structure is simple,
There is the good suitability.
Accompanying drawing explanation
Fig. 1 is radial polarisation light schematic diagram of the present invention.
Fig. 2 is that line polarized light of the present invention and radial polarisation light are focusing on, after microcobjective converges, the three-dimensional that light field coherent superposition produces
Polarization schematic diagram.
Fig. 3 is that microcobjective of the present invention focuses on light field three-dimensional polarization direction schematic diagram.
Fig. 4 is the structural representation that the present invention controls that microcobjective focuses on the device in light field three-dimensional polarization direction.
Wherein, 1 is half-wave plate, and 2 is polarization beam splitter prism, and 3 is phase compensator, and 4 is quarter-wave plate, and 5 is that line is inclined
Shake the light polarizer, and 6 is plane mirror, and 7 is plane mirror, and 8 is radial polarisation photoconverter, and 9 is beam cementing prism, and 10
For plane mirror, 11 is microcobjective, and 12 is focussing plane, and 13 is the linear polarization of the first bunch polarized light, and 14 are
The linear polarization of the second bunch polarized light.
Detailed description of the invention
Embodiments of the present invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish phase
Same or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing
The embodiment stated is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
As it is shown in figure 1, illustrate the direction of the electric field oscillation of radial polarisation light, i.e. polarization direction, in light cross section therefrom
The heart is along the direction of half radial direction surrounding outgoing.
The ultimate principle of the present invention is based on two facts: (1) radial polarisation light through microcobjective converge in focusing light field permissible
Produce the electric field along optical axis direction vibration, the i.e. longitudinally light field of polarization；(2) line polarized light is focusing on light field after microcobjective converges
Continue to keep line polarized light, and yawing moment does not changes.True based on the two, propose to utilize line polarized light and radial direction partially
The light that shakes focuses on light field at microcobjective and carries out the polarized light of coherent superposition generation three-dimensional, as shown in Figure 2.In fig. 2, empty
Line represents line polarized light light, and solid line represents radial polarisation light light, and the small arrow on light represents the polarization direction of respective light.
Focusing at light field after microcobjective converges, the constant continuation of line polarized light yawing moment keeps vertical with optical axis, and radial polarisation
The most remaining longitudinal polarized component along optical axis after being overlapped mutually due to itself light field, both coherent superposition can produce has three
The light field of dimension polarization direction.
The three-dimensional polarization direction of focusing light field is as it is shown on figure 3, Z axis is optical axis, and X/Y plane is focussing plane, focuses on the electricity of light field
E points to three dimensions either direction, is β with focussing plane X/Y plane angle, its projection in X/Y plane and X-axis
Angle is α.β depends on focusing on light field intensity in focussing plane and between longitudinal polarized component of vertical focusing in-plane
Ratio, ultimately depends on the beam intensity ratio between line of incidence polarization and radial polarisation, and α depends on focusing on light field in focussing plane
The direction of polarized component, is accordingly dependent on the polarization direction of incident microcobjective line polarized light.Polarized and footpath by regulation line of incidence
The size of β can be regulated to the ratio of polarized light, α can be regulated by regulation line of incidence polarization direction, finally realize micro-thing
Mirror focuses on the control of light field Arbitrary 3 D polarization direction.
According to above-mentioned principle, the microcobjective that the present invention provides focuses on light field three-dimensional polarization and controls device as shown in Figure 4, incident phase
Main line polarized light first passes through the half-wave plate 1 of rotatable quick shaft direction, then by polarization beam splitter prism 2, is divided into polarization direction phase
Two the most vertical bunch polarized light I and II, polarization direction is respectively such as 13,14 instructions.Polarization beam splitter prism 2, plane mirror
6, plane mirror 7, beam cementing prism 9 form Mach Zehnder optical interference circuit, two bundle polarized light I and II warps respectively after beam splitting
Arm is interfered to be combined into same light beam eventually through beam cementing prism 9 for two.Two-beam is permissible through optical path difference produced by different optics
Carry out optical path compensation by phase compensator 3 so that its optical path difference is 0 or π, can insert in any one light path of two-beam
The optical prism entering adjustable light path is adjusted.Two bundle polarized light I and II enter aobvious through plane mirror 10 after being combined into same light beam
Speck mirror 11, produces three-dimensional polarization light in focussing plane 12 coherent superposition after being focused on by microcobjective 11.
Line deflection light I after beam splitting first passes through phase compensator 3, and then by a quarter-wave plate 4, this wave plate is fast
The polarization direction 13 of direction of principal axis and line polarized light I is in 45 ° of angles.Thus become by line polarized light I after this quarter-wave plate
Circularly polarized light, circularly polarized light passes through a axis of homology rotatable line polarized light polarizer 5 afterwards, and outgoing polarization direction is rotatable
Line polarized light.By regulating the polarization direction of this emergent ray polarized light, scalable focuses on light field three-dimensional polarization direction and puts down at XY
The angle [alpha] of face inner projection.
Line polarized light II after beam splitting passes through radial polarisation photoconverter 8, is converted to radial polarisation light.Radial polarisation light is changed
Device is a liquid crystal device, can be respectively controlled zones of different liquid crystal, thus press in incident ray polarized light beam cross section
According to certain rule, the polarization direction of regulation and control zones of different produces radial polarisation light.
Owing to the light intensity ratio of two bunch polarized light I and II determines the angle beta of three-dimensional polarization light.By rotatable halfwave plate 1
Change the direction of line of incidence deflection light, polarized by two bunch that polarization beam splitter prism 2 just can obtain light intensity ratio different afterwards
Light I and II, final control three-dimensional polarization angular β.
Assume that the yawing moment of incident illumination, along polarization direction 13, is β in microcobjective focusing light field generation and X/Y plane angle,
As follows with two steps of the three-dimensional polarization light that X/Y plane inner projection angle is α:
(1) need the quick shaft direction of rotatable halfwave plate 1 with the angle of polarization direction 13 to be with the control that X/Y plane angle is βProduce polarization direction for polarization direction 13 angle to beLine polarized light.
(2) control of the projection angle α in X/Y plane is the most fairly simple, the linear polarization in direct rotational line polarized light light path
The quick shaft direction of the light polarizer 5 is α with the angle of polarization direction 13, then outgoing polarization direction is the line polarized light of α.
Above example is only the technological thought that the present invention is described, it is impossible to limit protection scope of the present invention with this, every according to this
The technological thought that invention proposes, any change done on the basis of technical scheme, within each falling within scope.
Claims (8)
1. the device controlling microcobjective focusing light field three-dimensional polarization direction, it is characterised in that include beam splitting module, polarization
Rotary module, radial polarisation photoconverter and bundling device；
Described beam splitting module is for being divided into two bunch polarized light by incident phase mains polarized light, and regulates between two bunch polarized light
Beam intensity ratio；
Polarization rotary module polarization direction of the first bunch polarized light after controlling beam splitting；
Radial polarisation photoconverter is for being converted to radial polarisation light by the second bunch polarized light after beam splitting；
Bundling device is for by inclined to the line polarized light through polarization rotary module outgoing and the radial direction obtained after radial polarisation transducer is changed
The light that shakes is combined into coaxial beam, incident microcobjective.
Control microcobjective the most according to claim 1 and focus on the device in light field three-dimensional polarization direction, it is characterised in that this dress
Putting and also include phase compensator, described phase compensator is the optical prism of adjustable light path, the most a branch of linear polarization after being positioned at beam splitting
In the light path of light, making the phase contrast when closing bundle of the two bunch polarized light after beam splitting is 0 or π.
Control microcobjective the most according to claim 1 or claim 2 focuses on the device in light field three-dimensional polarization direction, it is characterised in that
Described beam splitting module includes half-wave plate and polarization beam splitter prism；Described half-wave plate is for changing the polarization side of incident phase mains polarized light
To；Polarization beam splitter prism is for being divided into the orthogonal two bunch polarized light in polarization direction by the line polarized light of half-wave plate.
Control microcobjective the most according to claim 1 or claim 2 focuses on the device in light field three-dimensional polarization direction, it is characterised in that
Described polarization rotary module includes quarter-wave plate and the line polarized light polarizer；Described quarter-wave plate for by after beam splitting its
In a branch of line polarized light be converted to circularly polarized light；The line polarized light polarizer for being converted to polarization direction and linear polarization by circularly polarized light
The line polarized light that light polarizer axis of homology direction is consistent.
Control microcobjective the most according to claim 1 or claim 2 focuses on the device in light field three-dimensional polarization direction, it is characterised in that
Described bundling device is beam cementing prism.
6. one kind controls the method that microcobjective focuses on light field three-dimensional polarization direction, it is characterised in that comprise the steps:
Step 1, utilizes beam splitting module that incidence phase mains polarized light is divided into two bunch polarized light, and polarization rotary module changes first
Outgoing behind the polarization direction of bunch polarized light, radial polarisation photoconverter goes out after the second bunch polarized light is converted to radial polarisation light
Penetrating, two bundle emergent lights are combined into incidence microcobjective after coaxial beam by bundling device, converge two bundle outgoing focusing on light field microcobjective
Light, wherein, line polarized light keeps its polarization direction in focussing plane, and keeps the polarization direction before its incident microcobjective,
And radial polarisation light produces the vertically polarized light of vertical focusing plane, the polarized component coherent superposition of two different directions produces three-dimensional
Polarized light；
Step 2, utilizes the incident phase mains polarized light of beam splitting module regulation the first bunch polarized light after beam splitting and the second bunch inclined
Shake the light intensity ratio of light, control microcobjective and focus on light field in focussing plane and the ratio of vertical focusing in-plane polarized component
Example, thus control the angle focusing on light field polarization direction with focussing plane；
Step 3, the polarization direction utilizing polarization rotary module to rotate described first bunch polarized light controls to focus on light field and is focusing on
The direction of polarized component in plane, thus control microcobjective and focus on light field polarization direction in the direction of focussing plane inner projection.
Control the method that microcobjective focuses on light field three-dimensional polarization direction the most according to claim 6, it is characterised in that described
Step 2 method particularly includes: by rotating the quick shaft direction of half-wave plate in beam splitting module, change the inclined of incident phase mains polarized light
Shake direction, is changed the most therewith by the two bunch polarized light light intensity ratios obtained after polarization beam splitter prism beam splitting.
Control the method that microcobjective focuses on light field three-dimensional polarization direction the most according to claim 6, it is characterised in that described
Step 3 method particularly includes: change emergent ray by the quick shaft direction of the line polarized light polarizer in rotatory polarization rotary module inclined
Shake the polarization direction of light.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144351A (en) * | 2017-04-06 | 2017-09-08 | 西安交通大学 | A kind of broadband full polarization imaging method based on Mach Zehnder interferometer |
| CN107421641A (en) * | 2017-04-06 | 2017-12-01 | 西安交通大学 | A kind of broadband full polarization imaging device based on Mach Zehnder interferometer |
| CN109239915A (en) * | 2018-09-29 | 2019-01-18 | 南京理工大学 | A method of it generating hamburger pouch-type and focuses light field |
| CN110095856A (en) * | 2018-01-30 | 2019-08-06 | 顾士平 | Synchronized orthogonal laser image rebuilding super resolution microscope |
| CN110836979A (en) * | 2019-11-28 | 2020-02-25 | 山东建筑大学 | Angular velocity measuring system capable of finely adjusting light intensity ratio of signal light to reference light |
| CN112147595A (en) * | 2019-06-27 | 2020-12-29 | 华为技术有限公司 | Laser detection device, method and system |
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| CN103293696A (en) * | 2013-05-27 | 2013-09-11 | 西北大学 | Device for generating arbitrary vector beams based on Mach-Zehnder interferometer |
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- 2016-06-29 CN CN201610499181.6A patent/CN105911682B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103293696A (en) * | 2013-05-27 | 2013-09-11 | 西北大学 | Device for generating arbitrary vector beams based on Mach-Zehnder interferometer |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144351A (en) * | 2017-04-06 | 2017-09-08 | 西安交通大学 | A kind of broadband full polarization imaging method based on Mach Zehnder interferometer |
| CN107421641A (en) * | 2017-04-06 | 2017-12-01 | 西安交通大学 | A kind of broadband full polarization imaging device based on Mach Zehnder interferometer |
| CN107421641B (en) * | 2017-04-06 | 2018-09-04 | 西安交通大学 | A kind of broadband full polarization imaging device based on Mach Zehnder interferometer |
| CN107144351B (en) * | 2017-04-06 | 2018-12-07 | 西安交通大学 | A kind of broadband full polarization imaging method based on Mach Zehnder interferometer |
| CN110095856A (en) * | 2018-01-30 | 2019-08-06 | 顾士平 | Synchronized orthogonal laser image rebuilding super resolution microscope |
| CN110095856B (en) * | 2018-01-30 | 2022-03-01 | 顾士平 | Synchronous orthogonal laser image reconstruction super-resolution microscope |
| CN109239915A (en) * | 2018-09-29 | 2019-01-18 | 南京理工大学 | A method of it generating hamburger pouch-type and focuses light field |
| CN112147595A (en) * | 2019-06-27 | 2020-12-29 | 华为技术有限公司 | Laser detection device, method and system |
| CN110836979A (en) * | 2019-11-28 | 2020-02-25 | 山东建筑大学 | Angular velocity measuring system capable of finely adjusting light intensity ratio of signal light to reference light |
| CN110836979B (en) * | 2019-11-28 | 2020-08-04 | 山东建筑大学 | Angular velocity measuring system capable of finely adjusting light intensity ratio of signal light to reference light |
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