CN106980190A - A kind of method that utilization angular polarization vector light produces adjustable chain magnetic spot - Google Patents
A kind of method that utilization angular polarization vector light produces adjustable chain magnetic spot Download PDFInfo
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- CN106980190A CN106980190A CN201710304533.2A CN201710304533A CN106980190A CN 106980190 A CN106980190 A CN 106980190A CN 201710304533 A CN201710304533 A CN 201710304533A CN 106980190 A CN106980190 A CN 106980190A
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- 230000010287 polarization Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000006870 function Effects 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 235000012489 doughnuts Nutrition 0.000 claims description 2
- 239000010408 film Substances 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 claims description 2
- 239000010409 thin film Substances 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 4
- 230000005415 magnetization Effects 0.000 description 10
- 238000009826 distribution Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000013500 data storage Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
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Abstract
The invention discloses a kind of method that utilization angular polarization vector light produces adjustable chain magnetic spot, the two beam identical angular polarization vector beams that light source is produced respectively from both sides pass sequentially through transmission-type amplitude type spatial light modulator with and spiral phase plate, the adjustable amplitude information figure of three annular radiis of identical is loaded in two amplitude type spatial light modulators, two beam angularly polarized lights have helical phase again after spiral phase plate, angularly polarized light is changed into angular polarization vortex light, angular polarization vector beam with amplitude and phase information obtains multiple spherical magnetic spots at equal intervals after high numerical aperture lens are focused on, being capable of efficient capture atom.The inventive method simply easily realizes that apparatus structure is simple, it is easy to adjust, and manufacturing cost is low；Device stability is good, it is not necessary to other special optical elements.
Description
Technical field
Regulate and control field the present invention relates to light field, and in particular to a kind of to realize the method that adjustable chain magnetic spot is produced.
Background technology
In recent years, domestic and international researcher generates interest to the interaction between light field and magneto-optic memory technique because its
There is potential application in terms of full magneto-optical recorder, atom seizure, Laser Scanning Confocal Microscope.Current report is shown, passes through inverse method
Draw effect, circularly polarized light produces longitudinal magnetization under lens focus, but the component of transverse magnetisation of its hollow shape contained
It is unfavorable for full magneto-optical recorder.
In order to eliminate component of transverse magnetisation, Gu Min research groups introduce angularly polarized light, and confirm angular polarization spiral
Light produces pure longitudinal magnetization under lens focus, eliminates cross magnetization.In order to produce long longitudinal magnetization, Li Xiangping et al.
Longitudinal needle of sub-wavelength is produced using circular spiral phase filter.Nearest Zhang Dawei group uses angular and radially adjusted simultaneously
The ring-type phase filter of system further generates 28 λ pure longitudinal needle.It is pure that those described above optimizes
Longitudinal magnetization can perform well in capture atom and full magneto-optical recorder, but for needing to capture a number of atom and many
Using limited when individual magnetooptic recording and storage.For this problem, Song Ying woodss group is modulated from three ring spiral phase plate devices
Angularly polarized light produces multiple magnetic spots, but the intensity of magnetization is gradually reduced to both sides, and capture atom number is limited, and magnetic spot compared with
Greatly, and not rounded is symmetrical, it is unfavorable for capture.
The content of the invention
Goal of the invention：It is an object of the invention to for problem of the prior art, it is proposed that one kind utilizes angular polarization arrow
Measure the method that light produces adjustable chain magnetic spot.
Technical scheme：The invention provides a kind of method that utilization angular polarization vector light produces adjustable chain magnetic spot, one
Light source, transmission-type amplitude type spatial light modulator, spiral phase plate and the lens that the coaxial order of group is set are in mirror image with another group
Symmetrical and two lens focuses are overlapped, and magneto-optic memory technique is placed in focal point；
Wherein, the light source produces angularly polarized light, and two transmission-type amplitude type spatial light modulator loadings are same
Three donut amplitude information figures, the radius of each annulus can be adjusted by changing the information of loading, and amplitude is adjusted
Device processed is superimposed to form vortex binary filter with spiral phase plate, and the phase information expression formula of spiral phase plate is：
Wherein, (ρ, φ) is the radially and angularly coordinate under polar coordinate system, and Δ l=Δ nh/ λ are the spiral shell in units of wavelength
The stride height of phase-plate is revolved, Δ n is the difference of the specific refractivity of phase-plate and surrounding medium, and λ is the wavelength of light in vacuum, h
For the rotation shoulder height of spiral phase plate；
The amplitude information expression formula that transmission-type amplitude type spatial light modulator is loaded is：
T (ρ, φ)=ε (ρ-t1ρ0)ε(t2ρ0-ρ)
Wherein, (ρ, φ) is the radially and angularly coordinate under polar coordinate system, ρ0For outer shroud radius, t1、t2Respectively inner ring,
The radii ratio of middle ring and outer shroud, 0 ＜ t1＜ t2＜ 1 and t2-t1No more than 0.1, ε () is jump function；
In the phase information that the amplitude information that transmission-type amplitude type spatial light modulator is loaded is carried with spiral phase plate
It is overlapped, the input light field modulation function realized is：
Angular polarization vector beam with amplitude and phase information obtains multiple equidistant chains after lens focus
Shape magnetic spot, is distributed in three-dimensional globular, because each magnetic spot has each magnetic spot in the power for pointing to its center, catenulate multiple magnetic spots
Also there is the power for pointing to respective center, therefore improve atom seizure efficiency and magneto-optic data storage density.
Further, the magneto-optic memory technique is the magneto-optic thin film of rare earth alloy, and film thickness is 0.03~0.05 millimeter.
Further, the numerical aperture of the lens is more than 0.5.
Further, by adjusting the radii ratio t of inner ring, middle ring and outer shroud1、t2The magnetic spot of varying number can be obtained.
Inventive principle：The two beam identical angular polarization vector beams that the present invention produces light source lead to successively from both sides respectively
Cross transmission-type amplitude type spatial light modulator with and spiral phase plate, load identical in two amplitude type spatial light modulators
The adjustable amplitude information figure of three annular radiis, two beam angularly polarized lights have helical phase again after spiral phase plate, will
Angularly polarized light is changed into angular polarization vortex light, and the angular polarization vector beam with amplitude and phase information is through too high numerical value
Aperture lens obtains multiple spherical magnetic spots at equal intervals after focusing on.
Beneficial effect：The present invention on the basis of angular polarization vector beam is produced, is shaken according to prior art by light beam
Width is modulated and phase-modulation, then uses high numerical aperture lens tightly focused, can obtain multiple magnetic spots, each magnetic near focal point
Spot is all spherical distribution, and shape, size, the magnetic spot intensity of each magnetic spot are identical；By adjusting on vortex binary filter
The amplitude information of loading, it is possible to achieve the control of magnetic spot number.The inventive method easily realizes that apparatus structure is simple, it is easy to adjust
Whole, manufacturing cost is low, and device stability is good, it is not necessary to other special optical elements.
Brief description of the drawings
Fig. 1 is the structural representation of apparatus of the present invention；
Fig. 2 is the amplitude information figure loaded in two transmission-type amplitude type spatial light modulators in embodiment 1；
Fig. 3 is multiple magnetic spot figures of the chain obtained in embodiment 1；
Fig. 4 is the scatter chart of the horizontal and vertical intensity of magnetization of chain magnetic spot obtained in embodiment 1；
Fig. 5 is the amplitude information figure loaded in two transmission-type amplitude type spatial light modulators in embodiment 2；
Fig. 6 is the figure of the modulation magnetic spot number obtained in embodiment 2；
Fig. 7 is the scatter chart of the horizontal and vertical intensity of magnetization of chain magnetic spot obtained in embodiment 2.
Embodiment
Technical solution of the present invention is described in detail below, but protection scope of the present invention is not limited to the implementation
Example.
Embodiment：A kind of utilization angular polarization vector light produces the device of adjustable chain magnetic spot, as shown in figure 1, including two
Individual transmission-type amplitude type spatial light modulator 1 and 2, two spiral phase plates 3 and 4, two and of identical high numerical aperture lens 5
6th, two controllers 7 and 8 and two same light sources 9 and 10, the focus of two high numerical aperture lens 5,6 are overlapped, helical phase
Plate 3,4, transmission-type amplitude type spatial light modulator 1,2 and light source 9,10 symmetrically being put to both sides successively since lens both sides
Put, transmission-type amplitude type spatial light modulator 1,2 connects each loading of self-corresponding controller 7,8 amplitude information figure respectively.
Angular polarization vector beam is produced according to prior art, two beam identical angular polarization vector beams are respectively from left and right
Both sides are incident, and a branch of angular polarization vector light in left side sequentially passes through transmission-type amplitude type spatial light modulator 1 and spiral phase plate
3.Controller 7 loads the adjustable amplitude information figure of three annular radiis in transmission-type amplitude type spatial light modulator 1.Controller
8 load amplitude information figure in transmission-type amplitude type spatial light modulator 2.Angular polarization with special amplitude and phase information
Vector beam obtains multiple magnetic spots in chain after high numerical aperture lens are focused on.
Actual achievable two functions of the invention：One is to produce chain magnetic spot, and two be regulation and control magnetic spot number.As long as production
For raw chain magnetic spot, as long as the amplitude information of modulation vortex binary filter, as long as adjusting t1And t2Size, it is ensured that 0 ＜
t1＜ t2＜ 1 and t2-t1Value between 0 to 0.01.For example, we set t1=0.92, t2=0.93, ρ0=1, it is carried in
Transmission-type amplitude type spatial light modulator 1 and the amplitude information figure that is carried in transmission-type amplitude type spatial light modulator 2
Expression formula is all：
Its distribution of amplitudes is as shown in Figure 2.The magnetic spot of generation is as shown in figure 3, the horizontal and vertical magnetization of produced magnetic linkage
The scatter chart of intensity is as shown in figure 4, generate 15 equal in magnitude, equiform equidistantly spherical magnetic spots in figure.
If regulating and controlling magnetic spot number, we are accomplished by setting different t1And t2Value, t2With t1Difference arrived 0
In the range of 0.01.We first set t1Value, then adjust t2Value, finally choose optimal t2Value, so as to ensure that magnetic spot is
Size is identical and circle is symmetrical.The different t by setting1Value obtains the chain magnetic spot of different numbers.Different t are set1And t2
Value is exactly to change the amplitude information figure being carried in two amplitude type spatial light modulators.For example, we set t1=0.7, ρ0=
1, t2It is set as 0.71 for the time being, then is carried in transmission-type amplitude type spatial light modulator 1 and is carried in transmission-type amplitude type sky
Between the expression formula of amplitude information on optical modulator 2 be all：
Its distribution of amplitudes is as shown in Figure 5.The magnetic spot of generation is as shown in fig. 6, the horizontal and vertical magnetization of produced magnetic linkage
The scatter chart of intensity is as shown in fig. 7, generate 19 size shapes almost consistent spherical magnetic spot, by constantly micro- in figure
Adjust t2Value so as to ensureing that shape size is approached to completely the same.
In summary, present invention foundation prior art is angular by allowing on the basis of angular polarization vector beam is produced
Polarization vector light beam passes through amplitude modulaor and spiral phase plate, makes the upper amplitude information of its loading and phase information, finally the light
Beam can obtain multiple spherical magnetic spots, shape, the size of each magnetic spot by high numerical aperture lens tightly focused near focal point
It is identical with intensity, realize the capturing function to multiple atoms.The inventive method easily realizes that apparatus structure is simple, easily
In adjustment, manufacturing cost is low；Device stability is good, it is not necessary to other special optical elements.
Claims (4)
1. a kind of method that utilization angular polarization vector light produces adjustable chain magnetic spot, it is characterised in that：One group coaxially sequentially sets
Light source, transmission-type amplitude type spatial light modulator, spiral phase plate and the lens put are in specular with another group and two saturating
The focus of mirror is overlapped, and magneto-optic memory technique is placed in focal point；
Wherein, the light source produces angularly polarized light, and two transmission-type amplitude type spatial light modulators load same three
Individual donut amplitude information figure, the radius of each annulus can be adjusted by changing the information of loading, amplitude modulaor
It is superimposed to form vortex binary filter with spiral phase plate, the phase information expression formula of spiral phase plate is：
Wherein, (ρ, φ) is the radially and angularly coordinate under polar coordinate system, and Δ l=Δ nh/ λ are the spiral phase in units of wavelength
The stride height of position plate, Δ n is the difference of the specific refractivity of phase-plate and surrounding medium, and λ is the wavelength of light in vacuum, and h is spiral shell
Revolve the rotation shoulder height of phase-plate；
The amplitude information expression formula that transmission-type amplitude type spatial light modulator is loaded is：
T (ρ, φ)=ε (ρ-t1ρ0)ε(t2ρ0-ρ)
Wherein, (ρ, φ) is the radially and angularly coordinate under polar coordinate system, ρ0For outer shroud radius, t1、t2Respectively inner ring, centre
The radii ratio of ring and outer shroud, 0 ＜ t1＜ t2＜ 1 and t2-t1No more than 0.1, ε () is jump function；
Carried out in the phase information that the amplitude information that transmission-type amplitude type spatial light modulator is loaded is carried with spiral phase plate
It is superimposed, the input light field modulation function realized is：
Angular polarization vector beam with amplitude and phase information obtains multiple equidistant chain magnetic after lens focus
Spot, is distributed in three-dimensional globular.
2. the method that utilization angular polarization vector light according to claim 1 produces adjustable chain magnetic spot, it is characterised in that：
The magneto-optic memory technique is the magneto-optic thin film of rare earth alloy, and film thickness is 0.03~0.05 millimeter.
3. the method that utilization angular polarization vector light according to claim 1 produces adjustable chain magnetic spot, it is characterised in that：
The numerical aperture of the lens is more than 0.5.
4. the method that utilization angular polarization vector light according to claim 1 produces adjustable chain magnetic spot, it is characterised in that：
By the radii ratio t for adjusting inner ring, middle ring and outer shroud1、t2The magnetic spot of varying number can be obtained.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109783888A (en) * | 2018-12-26 | 2019-05-21 | 南京师范大学 | A kind of generation method for the photic aciculiform magnetizing field that multidimensional is controllable |
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| CN102981391A (en) * | 2012-12-18 | 2013-03-20 | 苏州大学 | Method for generating random electromagnetic gaussian schell model vortex beam |
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2017
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Patent Citations (4)
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| CN101520556A (en) * | 2009-01-19 | 2009-09-02 | 中国计量学院 | Spiral cone beam generating device |
| CN102141690A (en) * | 2011-05-05 | 2011-08-03 | 西北工业大学 | Spiral phase plate with adjustable parameters |
| CN102981391A (en) * | 2012-12-18 | 2013-03-20 | 苏州大学 | Method for generating random electromagnetic gaussian schell model vortex beam |
| CN105242413A (en) * | 2015-09-02 | 2016-01-13 | 鲁东大学 | Hexagonal array spiral phase plate and manufacturing method |
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| LIPING GONG等: "Generation and manipulation of super-resolution spherical magnetization chains", 《APPLIED OPTICS》 * |
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| CN109783888A (en) * | 2018-12-26 | 2019-05-21 | 南京师范大学 | A kind of generation method for the photic aciculiform magnetizing field that multidimensional is controllable |
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Application publication date: 20170725 |