CN1588165A - Confocal system of three-dimensional super-resolution of phase type - Google Patents
Confocal system of three-dimensional super-resolution of phase type Download PDFInfo
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- CN1588165A CN1588165A CN 200410066551 CN200410066551A CN1588165A CN 1588165 A CN1588165 A CN 1588165A CN 200410066551 CN200410066551 CN 200410066551 CN 200410066551 A CN200410066551 A CN 200410066551A CN 1588165 A CN1588165 A CN 1588165A
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Abstract
A phase type three-dimensional super-resolution confocal system comprises: a confocal system is composed of a first objective lens and a second objective lens, a binary phase type transverse super-resolution diaphragm is arranged in front of the first objective lens on the optical axis of the confocal system, a three-ring binary phase type axial super-resolution diaphragm is arranged in front of the second objective lens, a pinhole diaphragm is arranged at the rear focus of the confocal system, a convergent lens is arranged in front of the first objective lens of the confocal system, and the distance L between the convergent lens and the first objective lens is f1+f2Wherein f is1To the focal length of the converging lens, f2The front focal length of the confocal system. The invention can realize super resolution in transverse and axial directions, and can greatly inhibit side lobe interference.
Description
Technical field
The present invention relates to is super resolution technology, particularly a kind of confocal system at the phase type three dimension super resolution that laterally and axially all can break through diffraction limit realization super-resolution.It can be widely used in optical imaging system and the light beam focusing system.
Background technology
Along with the increase day by day that information stores, processing and transmission quantity require, in microelectronics processing, photoetching technique, scanning microtechnic and high density compact disc storage, all wish to obtain littler focal beam spot.This just requires shorter optical maser wavelength and the more focusing objective len of high-NA is arranged, because the halfwidth of focal beam spot can be expressed as
λ is the laser beam wavelength of incident in the formula, and NA is the numerical aperture of focusing objective len.What but the limit laser wavelength that is subjected to light source can only be limited reduces, and it is big to adopt the object lens of big numerical aperture then can bring such as the difference correction difficulty, and focus servosystem designs problem such as difficulty more.Super resolution technology then can success avoid above problem.Super resolution technology (being exactly the technology that exceeds diffraction limit) also is to be usually used in one of method of dwindling measuring point, it is by placing a diffraction type diaphragm in the collimated light path before focusing objective len, the amplitude or the position that change incident light distribute mutually, make that the Airy disk master spot after lens focus diminishes.But designed the restriction with processing conditions, single diffraction diaphragm with practical value can only laterally or axially realized super-resolution, is difficult in both direction and realizes super-resolution simultaneously.This difficulty has limited the application of super resolution technology greatly.Therefore design and a kind ofly can realize that the system of three-dimensional super-resolution is very useful.
Summary of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned prior art problems, and a kind of phase type three dimension super resolution confocal system that can be widely used in optical imaging system and light beam focusing system is provided.This system uses this system can obtain the small light spot of breakthrough diffraction limit on three-dimensional laterally and axially can realize super-resolution simultaneously.In addition, this three-dimensional super-resolution system suppressed sidelobes interference greatly.
Basic thought of the present invention is:
Before respectively a horizontal phase-type super-resolution diaphragm and an axial phase-type super-resolution diaphragm being placed two object lens of confocal read-out system, utilize the product character of confocal system to realize three-dimensional super-resolution.
Technical solution of the present invention is as follows:
A kind of phase type three dimension super resolution confocal system, the formation that it is characterized in that it is: form the burnt system that has altogether by first object lens and second object lens, place a two-value phase transverse super-resolution diaphragm before on the optical axis of this confocal system, being positioned at first object lens, place one or three ring two-value phase-type axial super resolution diaphragms before being positioned at second object lens, back focus at this confocal system is provided with pinhole diaphragm, before first object lens of this confocal system, place one and assemble lens, the distance L=f between this convergent lens and first object lens
1+ f
2
F wherein
1Be the focal length of convergent lens, f
2Front focal length for confocal system.
Described phase transverse super-resolution diaphragm is an annular two-value phase board, and the normalization radius of its outer shroud is 1 o'clock, interior ring radius a=0.33, and the position phase Φ of interior ring
1=π, the position phase Φ of outer shroud
2=0.
Described phase-type axial super resolution diaphragm is one three a ring two-value phase board, and the normalization radius of its outer shroud is 1 o'clock, and two interior ring radiuses from inside to outside are respectively b
1=0.56, b
2=0.6, the position of three rings is respectively Φ mutually from inside to outside
1=π, Φ
2=0, Φ
3=π.
Described convergence object lens are with the front focus of beam convergence to confocal system, and the pin hole receiving trap is positioned at the back focus place of confocal system.
In the confocal system of forming by two identical object lens, place phase transverse super-resolution diaphragm and phase-type axial super resolution diaphragm before two object lens respectively, form super-resolution confocal system.Enter into super-resolution confocal system from the light beam of laser emitting through assembling object lens focusing, implementing point at the back focus place of confocal system with pin hole by super-resolution confocal system transmission back surveys, hot spot after find focusing on is laterally and axially all can break through diffraction limit, thereby realizes three-dimensional super-resolution.
The present invention utilizes the product character of confocal system to realize three-dimensional super-resolution by phase transverse super-resolution diaphragm and phase-type axial super resolution diaphragm are coupled in the confocal system.Because this system laterally and is axially realizing super-resolution simultaneously, use this system can on three-dimensional, obtain to break through the small light spot of diffraction limit.In addition, this three-dimensional super-resolution system suppressed sidelobes interference greatly.
The present invention will be further described below in conjunction with embodiment and accompanying drawing:
Description of drawings
Fig. 1 is the light path synoptic diagram of phase type three dimension super resolution confocal system embodiment of the present invention.
Fig. 2 is the structural representation of two-value phase transverse super-resolution diaphragm.
Fig. 3 is the structural representation of three ring two-value phase-type axial super resolution diaphragms.
Fig. 4 does not add the super-resolution diaphragm, and two-value horizontal position phase super-resolution diaphragm and three-dimensional super-resolution system are at the light distribution comparison diagram that laterally produces.
Fig. 5 does not add the super-resolution diaphragm, and three ring two-values axial position phase super-resolution diaphragms and three-dimensional super-resolution system are at the light distribution comparison diagram that axially produces.
Embodiment
See also Fig. 1 earlier, Fig. 1 is the light path synoptic diagram of phase type three dimension super resolution confocal system embodiment of the present invention.As seen from the figure, the formation of phase type three dimension super resolution confocal system of the present invention is: form a confocal system by first object lens 3 and second object lens 5, place a two-value phase-type axial super resolution diaphragm 2 before on the optical axis of this confocal system, being positioned at first object lens 3, place one or three ring two-value phase-type axial super resolution diaphragms 4 before being positioned at second object lens 5, back focus at this confocal system is provided with pinhole diaphragm, before first object lens 3 of this confocal system, place one and assemble lens 1, the distance L=f between this convergent lens 1 and first object lens 3
1+ f
2
F wherein
1Be the focal length of convergent lens 1, f
2Front focal length for confocal system.
Described phase transverse super-resolution diaphragm 2 is annular two-value phase boards, and as shown in Figure 2, the normalization radius of its outer shroud is 1 o'clock, interior ring radius a=0.33, and the position phase Φ of interior ring
1=π, the position phase Φ of outer shroud
2=0.
Described phase-type axial super resolution diaphragm 4 is one three ring two-value phase boards, and as shown in Figure 3, the normalization radius of its outer shroud is 1 o'clock, and two interior ring radiuses from inside to outside are respectively b
1=0.56, b
2=0.6, the position of three rings is respectively Φ mutually from inside to outside
1=π, Φ
2=0, Φ
3=π.
Described convergence object lens 1 are with the front focus of beam convergence to confocal system, and the pin hole receiving trap is positioned at the back focus place of confocal system.
Fig. 4 and Fig. 5 are respectively the numerical result figure that computer simulation provides.Wherein 4a is the horizontal light distribution of three-dimensional super-resolution system gained, and 4b is the horizontal light distribution of two-value phase transverse super-resolution diaphragm gained, and 4c is the horizontal light distribution when not adding the super-resolution diaphragm.Wherein the pass of lateral optical coordinate and actual lateral coordinates r is:
After using the three-dimensional super-resolution system, the hot spot lateral dimension obviously reduces, and less than two-value phase transverse super-resolution diaphragm.Secondary lobe also almost is eliminated.Among Fig. 5,5a is the axial light distribution of three-dimensional super-resolution system gained, and 5b is the axial light distribution of three ring two-value phase-type axial super resolution diaphragm gained, and 5c is the axial light distribution when not adding the super-resolution diaphragm.Wherein axially the pass of optical coordinate and actual axial coordinate z is:
Identical with horizontal situation, use three-dimensional super-resolution axially also well compressing hot spot.Following table has provided the transverse super-resolution diaphragm, the reduced parameter value of axial super resolution diaphragm and three-dimensional super-resolution system:
Table one
| Horizontal half-breadth ratio | Axial half-breadth ratio | The Si Teer ratio | Horizontal secondary lobe relative intensity | Axial secondary lobe relative intensity | |
| The transverse super-resolution diaphragm | ??0.895 | ??/ | ??0.61 | ??13.12％ | ??/ |
| The axial super resolution diaphragm | ??/ | ??0.968 | ??0.82 | ??/ | ??7.32％ |
| The three-dimensional super-resolution system | ??0.66 | ??0.818 | ??0.5 | ??0 | ??0 |
The implication of each parameter is in the table:
Halfwidth: light intensity is reduced to the full duration of peak strength one half on the focused beam plane with a tight waist.
Half-breadth ratio: the ratio that adds super-resolution device front and back halfwidth.Half-breadth is better more than low more super-resolution effect.
Si Teer ratio: the ratio of central peak intensity on the focused beam face with a tight waist when adding central peak intensity on the face with a tight waist of the focused beam behind the super-resolution device and not adding the super-resolution device.
The secondary lobe relative intensity: the peak strength of focused beam first secondary lobe is one of index of weighing the focused beam quality with the ratio of the peak strength of main spot, and secondary lobe relative intensity low beam quality more is good more.
By comparing, the present invention has following superiority: laterally and axially breaking through diffraction limit simultaneously, realize three-dimensional super-resolution; Laterally better hyperresolution is being arranged with phase transverse super-resolution diaphragm ratio; Axially better hyperresolution is being arranged with phase-type axial super resolution diaphragm ratio; Laterally and axially all suppressing secondary lobe greatly.Therefore, the present invention can be widely used in optical imaging system and light beam focusing system.
Claims (4)
1, a kind of phase type three dimension super resolution confocal system, the formation that it is characterized in that it is: form a confocal system by first object lens (3) and second object lens (5), on the optical axis of this confocal system, be positioned at the preceding placement one two-value phase transverse super-resolution diaphragm (2) of first object lens (3), be positioned at preceding placement one or the three ring two-value phase-type axial super resolution diaphragms (4) of second object lens (5), back focus at this confocal system is provided with pinhole diaphragm (6), place one before at first object lens (3) of this confocal system and assemble lens (1), the distance L=f between this convergent lens (1) and first object lens (3)
1+ f
2, f wherein
1Be the focal length of convergent lens (1), f
2Front focal length for this confocal system.
2, phase type three dimension super resolution confocal system according to claim 1, it is characterized in that described phase transverse super-resolution diaphragm (2) is an annular two-value phase board, the normalization radius of its outer shroud is 1 o'clock, interior ring radius a+0.33, and the position phase Φ of interior ring
1=π, the position phase Φ of outer shroud
2=0.
3, phase type three dimension super resolution confocal system according to claim 1 is characterized in that described phase-type axial super resolution diaphragm (4) is one three a ring two-value phase board, and the normalization radius of its outer shroud is 1 o'clock, and two interior ring radiuses from inside to outside are respectively b
1=0.56, b
2=0.6, the position of three rings is respectively Φ mutually from inside to outside
1=π, Φ
2=0, Φ
3=π.
4,, it is characterized in that described convergence object lens (1) with the front focus of beam convergence, and the pin hole receiving trap is positioned at the back focus place of confocal system to confocal system according to each described phase type three dimension super resolution confocal system of claim 1 to 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100665514A CN100383605C (en) | 2004-09-21 | 2004-09-21 | Confocal system of three-dimensional super-resolution of phase type |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100665514A CN100383605C (en) | 2004-09-21 | 2004-09-21 | Confocal system of three-dimensional super-resolution of phase type |
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|---|---|
| CN1588165A true CN1588165A (en) | 2005-03-02 |
| CN100383605C CN100383605C (en) | 2008-04-23 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0676964B2 (en) * | 1989-09-26 | 1994-09-28 | 新技術事業団 | High resolution light receiving system and optical tomographic imaging apparatus using the light receiving system |
| JPH06148573A (en) * | 1992-11-09 | 1994-05-27 | Olympus Optical Co Ltd | Pupil modulation optical system |
| CN1186674C (en) * | 2000-11-30 | 2005-01-26 | 中国科学院上海光学精密机械研究所 | Phase type long focal depth super-resolution diaphragm |
| CN2762168Y (en) * | 2004-09-21 | 2006-03-01 | 中国科学院上海光学精密机械研究所 | Confocal system of three-dimensional super-resolution of phase type |
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