CN105137513A - Broadband photon screen based on phase coding - Google Patents
Broadband photon screen based on phase coding Download PDFInfo
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- CN105137513A CN105137513A CN201510610910.6A CN201510610910A CN105137513A CN 105137513 A CN105137513 A CN 105137513A CN 201510610910 A CN201510610910 A CN 201510610910A CN 105137513 A CN105137513 A CN 105137513A
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- sieve
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/44—Grating systems; Zone plate systems
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Abstract
The invention discloses a kind of broadband photon of phase coding sieves, diameter is D, including transparent flat substrate and the opaque metallic film being plated in the transparent flat substrate, does is the opaque metallic film equipped with the light passing aperture of ring-band shape distribution, and the position distribution of the light passing aperture meets equation
, in formula, f is the focal length of broadband photon sieve, and n is the annulus serial number of light passing annulus, and λ is the operation wavelength of photon screen, R is the radius of broadband photon sieve, and α is that code coefficient, k are wave number three times, and xm and ym are the center of m-th of aperture on n-th of light passing annulus, m=1,2,3.., num, wherein
,
, aperture radius
. The present invention devises width photon screen that is a kind of while having phase coding plate encoding function and conventional photonic sieve focusing function, photon screen is greatly reduced to the sensibility of wavelength, and in the case where not influencing photon screen resolution ratio, the bandwidth of photon screen has been widened, while having improved energy efficiency.
Description
Technical field
The present invention relates to a kind of optical element, be specifically related to a kind of photon screen, especially a kind of broadband photon sieve of phase coding.
Background technology
In prior art, photon screen is a kind of diffraction optical element proposed in calendar year 2001 by Kipp, similar with fresnel's zone plate, is all make odd number or even number Fresnel zone printing opacity, and makes adjacent wavestrip light tight.The wavestrip of printing opacity is designed to the micropore of printing opacity by photon screen, micropore is positioned in wavestrip, light wave arrives focus distance by each micropore center is the integral multiple of wavelength with the difference being arrived the distance of focus by optical axis, can realize focusing on and imaging, for high resolution microscope, light spectrum image-forming, x-ray imaging, UV photoetching etc.
As diffraction optical element, photon screen has very large aberration.Generally speaking, for the photon screen of a focal distance f, only to design wavelength lambda blur-free imaging.Therefore, when lambda1-wavelength is λ+Δ λ, f+ Δ f position will be focused on, at original focal plane position production background noise.
For solving the problem, Gimenez etc. propose a kind of fractal photon screen and go expand depth of focus and reduce aberration in document " F.Gim é nez; J.A.Monsoriu; W.D.Furlan; andA.Pons; " Fractalphotonsieve, " Opt.Express14 (25), 11958 – 11963 (2006) ".But this photon screen is what to reduce design wavelength be cost in the resolution of focusing position.The people such as Andersen propose a kind of by the telescopic system of photon screen as primary mirror in document " G.Andersen; andD.Tullson; " Broadbandantiholephotonsievetelescope, " Appl.Opt.46 (18), 3706 – 3708 (2007) ".In systems in which, another diffraction optical element is designed the color aberration characteristics compensating photon screen, reaches certain wide spectral imaging effect.But its catoptron having two to be greater than photon screen primary mirror is for collimated light path and focus on, this mode structure relative complex.The people such as week design and machined one piece of three wavelength photons sieve in document " C.X.Zhou; X.C.Dong; L.F.Shi; C.T.Wang; andC.L.Du; " Experimentalstudyofamultiwavelengthphotonsievedesignedby random-area-dividedapproach, " Appl.Opt.48 (8), 1619 – 1623 (2009) ".The design of this photon screen designs the three nonoverlapping holes of cover respectively for three different wavelength, for three wavelength imagings.But, its there is lower diffraction efficiency and only to design three wavelength imagings.The Chinese patent of application publication number CN104865627A discloses a kind of broadband photon based on wavefront coding technology and sieves, this broadband photon sifter device has a phase coding plate, a surface of phase coding plate is phase coding face, and another surface is plane, is glued with photon screen after plane.Before this photon screen, arrange phase coding plate, structure is slightly complicated.
Therefore, in order to above-mentioned shortcoming of the prior art, develop a kind of broadband photon sieve, make it not only have the focusing function of conventional photonic sieve, also possessed the encoding function of phase coding plate simultaneously, and structure is simple, obviously has positive realistic meaning.
Summary of the invention
Goal of the invention of the present invention is to provide a kind of broadband photon sieve of phase coding, under the prerequisite not affecting photon screen resolution, widens the bandwidth of photon screen.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of broadband photon sieve of phase coding, diameter is D, comprise transparent flat substrate and be plated in the suprabasil light tight metallic film of this transparent flat, described light tight metallic film is provided with the logical light aperture of ring-band shape distribution, and the position distribution of described logical light aperture meets equation
, in formula, f is the focal length of broadband photon sieve, and n is the endless belt sequence number of logical ring of light band, and λ is the operation wavelength of photon screen, and R is the radius of broadband photon sieve, and α is three code coefficients, and k is wave number, x
mand y
mthe center of m aperture on the n-th logical ring of light band, m=1,2,3 ..., num, wherein
,
, aperture radius
.
In technique scheme, described three code coefficient α > 20.
In further technical scheme, described three code coefficient α=20 π.
In technique scheme, described transparent flat substrate is glass, and its thickness is 2mm.
In technique scheme, described light tight metallic film is light tight chromium film, and its thickness is 100nm.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1. focusing in formula at conventional photonic sieve of the invention introduces phase coding phase, devise a kind of width photon screen simultaneously with phase coding plate encoding function and conventional photonic sieve focusing function, greatly reduce the susceptibility of photon screen to wavelength, and when not affecting photon screen resolution, widen the bandwidth of photon screen, improve energy efficiency simultaneously;
2. structure of the present invention is simple, light, is easy to processing.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment one middle width strip photon screen;
Fig. 2 is the aperture distribution schematic diagram of Fig. 1 broadband photon sieve;
Fig. 3 is the aperture distribution schematic diagram of conventional photonic sieve;
Fig. 4 is the device schematic diagram of the imaging performance of test conventional photonic sieve;
Fig. 5 is the experimental results of conventional photonic sieve at design wavelength 632.8nm;
Fig. 6 is the device schematic diagram of the imaging performance of testing broad-band photon screen;
Fig. 7 is the transmittance curve of bandpass filter in Fig. 6
Fig. 8 is the imaging results of conventional photonic sieve under wideband light source;
Fig. 9 is the imaging results of broadband photon sieve under wideband light source;
Figure 10 is the PSF comparison diagram that embodiment one conventional photonic sieve and broadband photon sieve at (α=20 Π);
Figure 11 is conventional photonic sieve and broadband photon sieve MTF curve map at different wavelengths;
Figure 12 is the imaging results figure of conventional photonic sieve under different wave length λ=625.8 ~ 639.8nm;
Figure 13 is the middle blurred picture of broadband photon sieve at different wave length λ=625.8 ~ 639.8nm;
Figure 14 is the final restored image of broadband photon sieve at different wave length λ=625.8 ~ 639.8nm.
Wherein: 1, transparent flat substrate; 2, light tight metallic film; 3, wavelength is the laser instrument of 632.8nm; 4, beam expanding lens; 5, wave filter; 6, scattering rotating disk; 7, parallel light tube; 8, conventional photonic sieve; 9, CCD; 10, display; 11, wideband light source; 12, bandpass filter; 13, broadband photon sieve.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment one: shown in Figure 1, a kind of broadband photon sieve of phase coding, diameter is D, comprises transparent flat substrate and is plated in the suprabasil light tight metallic film of this transparent flat, light tight metallic film is provided with the logical light aperture of ring-band shape distribution, and the position distribution of logical light aperture meets equation
, in formula, f is the focal length of broadband photon sieve, and n is the endless belt sequence number of logical ring of light band, and λ is the operation wavelength of photon screen, and R is the radius of broadband photon sieve, and α is three code coefficients, and k is wave number, x
mand y
mthe center of m aperture on the n-th logical ring of light band, m=1,2,3
...num, wherein
,
, aperture radius
.
In the present embodiment, three code coefficient α are 20 π.
In the present embodiment, transparent flat substrate is glass, and its thickness is 2mm.
In the present embodiment, light tight metallic film is light tight chromium film, and its thickness is 100nm.
On the basis of above-mentioned disclosure, designing concrete photon screen, is the aperture distribution schematic diagram of the present embodiment broadband photon sieve as shown in Figure 2.
As shown in Figure 3, it is the aperture distribution schematic diagram of conventional photonic sieve, can find out that the structure that conventional photonic sieves is donut, and the present embodiment broadband photon sieve is no longer donut as can be seen from Figure 1, but about y=x symmetrical structure form, because the coding item introduced in the present embodiment is numerically relatively little, so image is not clearly about y=x symmetry.
Utilize UV photoetching technique fabrication design focal length 500nm, diameter 50mm, operating central wavelength 632.8nm, the broadband photon sieve of code coefficient 20 π.
Sieve the broadband photon of above-mentioned acquisition sieve and conventional photonic and carry out performance test comparison, the design wavelength that wherein conventional photonic sieves is 632.8nm.
As a comparison, Fig. 4 is the device schematic diagram of the imaging performance of test conventional photonic sieve, wavelength is that the aperture that incoming laser beam that the laser instrument 3 of 632.8nm sends focuses on wave filter 5 by beam expanding lens 4 carries out filtering, and the laser beam after pin-hole filter-ing eliminates block by scattering rotating disk 6.Use a focal length 550mm, the parallel light tube 7 of bore 55mm and Pixel size are that the CCD9 of 4.54 μm (AVTProsilicaGX2750C) carries out imaging test, show on display 10.
Fig. 5 gives the experimental results of conventional photonic sieve at design wavelength 632.8nm, and in figure, (a) is PSF characteristic, and (b) is resolution rake test result, the amplification of the central area that (c) is test result (b).After careful inspection, the resolution limit of photon screen is about 50lp/mm.
As shown in Figure 6, for the device schematic diagram of the imaging performance of testing broad-band photon screen, the light beam that wideband light source 11 sends is by centre wavelength 632.8nm, the bandpass filter 12(THORLABScompanyFL632.8-10 of FWHM10nm), identical parallel light tube 7 is used to irradiate broadband photon sieve 13, carry out imaging test with CCD9, show on display 10.Fig. 7 is the transmittance curve of bandpass filter in Fig. 6.
The broadband photon sieve in Fig. 6 is replaced with conventional photonic sieve, as shown in Figure 8, wherein (a) is PSF characteristic to imaging results, and (b) is resolution rake test result, c () is the central area enlarged drawing of resolution rake (b), obvious conventional photonic sifter device has very large aberration.When the bandwidth of centre wavelength 632.8nm, FWHM10nm is incident, conventional photonic is sieved and creates very strong background noise at imaging plane.
Fig. 9 gives broadband photon sieve test result under the bandwidth incidence of centre wavelength 632.8nm, FWHM10nm.Experimental result picture 9(a) show, the PSF image that laboratory records has identical " L " shape feature, Fig. 9 (b) gives the middle blurred picture of broadband photon sieve, and Fig. 9 (c) is final restored image, the amplification of the central area that Fig. 9 (d) is restored image Fig. 9 (c).Middle blurred picture is recovered to picture rich in detail by suitable filter function, reaches and sieves in the substantially identical resolution of design wavelength 632.8nm with conventional photonic.Under centre wavelength 632.8nm, FWHM10nm illumination, the resolution of broadband photon sieve is 501p/nm.
In order to verify the broadband performance of the photon screen that the present invention obtains further, contrast the conventional photonic sieve of the present embodiment and broadband photon sieve under the illumination of different wave length photo respectively, contrast adopts computer simulation emulation to carry out, and result is as follows:
Figure 10 shows (λ=625.8 ~ 639.8nm) conventional photonic sieve and broadband photon under different wave length illumination and sieves the PSF situation of (α=20 Π).As can be seen from Figure 10 (a), conventional photonic sieve has stronger focusing power at design wavelength lambda=632.8nm place, but departing from along with wavelength, focusing power weakens greatly, can not blur-free imaging.But the PSF of Figure 10 (b) middle width strip photon screen maintains good consistance within the scope of wavelength X=625.8nm ~ 639.8nm.As λ <627.8nm and λ >637.8nm, PSF consistance slightly there occurs and departs from.
Figure 11 respectively show the Fourier transform of conventional photonic sieve and broadband photon sieve MTF(PSF at different wavelengths) curve.Along with wavelength departure is in design wavelength, the MTF curve of conventional photonic sieve declines rapidly, and occurs zero point, causes spatial frequency to lose.On the contrary, broadband photon sieve keeps good consistance within the scope of wavelength X=625.8 ~ 639.8nm, slightly reduces as λ <627.8nm and λ >637.8nm.Because MTF has good consistance at different wave length, and not there is zero point from high frequency to low frequency, so, can by designing suitable wave filter by middle blur image restoration.Therefore, the introducing that photon screen focuses on phase coding item in formula can reduce the susceptibility of photon screen to wavelength to a great extent, reaches the object expanding bandwidth.
Figure 12 gives the imaging results of conventional photonic sieve under different wave length λ=625.8 ~ 639.8nm.Along with wavelength departure is in design wavelength 632.8nm, image blur aggravates.The bandwidth of conventional photonic sieve is
.
Figure 13 gives the middle blurred picture of broadband photon sieve under different wave length (λ=625.8 ~ 639.8nm), and all images have almost identical fuzzy behaviour under different wavelength.
Figure 14 gives the final restored image of broadband photon sieve at different wave length (λ=625.8 ~ 639.8nm).Middle blurred picture under all wavelengths can both well be restored, and has and sieves in the substantially identical resolution of design wavelength with conventional photonic.When wavelength deviates from design wavelength (λ <627.8nm and λ >637.8nm) significantly, MTF slightly declines, and causes final restored image slightly to depart from.For with bore 50mm, focal length 500mm, the bandwidth of the broadband photon sieve of the present embodiment prepared by code coefficient α=20 Π is 14nm about after tested, and broadband photon sieve bandwidth is about 88 times of conventional photonic sieve bandwidth.
Claims (5)
1. the broadband photon sieve of a phase coding, diameter is D, comprise transparent flat substrate and be plated in the suprabasil light tight metallic film of this transparent flat, it is characterized in that: described light tight metallic film is provided with the logical light aperture of ring-band shape distribution, and the position distribution of described logical light aperture meets equation
, in formula, f is the focal length of broadband photon sieve, and n is the endless belt sequence number of logical ring of light band, and λ is the operation wavelength of photon screen, and R is the radius of broadband photon sieve, and α is three code coefficients, and k is wave number, x
mand y
mthe center of m aperture on the n-th logical ring of light band, m=1,2,3 ..., num, wherein
,
, aperture radius
.
2. the broadband photon sieve of phase coding according to claim 1, is characterized in that: described three code coefficient α > 20.
3. the broadband photon sieve of phase coding according to claim 2, is characterized in that: described α=20 π.
4. the broadband photon sieve of phase coding according to claim 1, it is characterized in that: described transparent flat substrate is glass, its thickness is 2mm.
5. the broadband photon sieve of phase coding according to claim 1, is characterized in that: described light tight metallic film is light tight chromium film, and its thickness is 100nm.
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| CN201510610910.6A CN105137513B (en) | 2015-09-23 | 2015-09-23 | A kind of broadband photon sieve of phase coding |
| PCT/CN2016/077040 WO2017049886A1 (en) | 2015-09-23 | 2016-03-22 | Phase encoding broadband photon sieve |
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| CN201510610910.6A CN105137513B (en) | 2015-09-23 | 2015-09-23 | A kind of broadband photon sieve of phase coding |
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| CN105137513B CN105137513B (en) | 2018-06-26 |
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Cited By (6)
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| CN105404017A (en) * | 2015-12-21 | 2016-03-16 | 哈尔滨工业大学 | Photon sieve main mirror double-color imaging optical system and application thereof |
| CN106054297A (en) * | 2016-08-01 | 2016-10-26 | 苏州大学 | Large field diffraction photon sieve |
| WO2017049886A1 (en) * | 2015-09-23 | 2017-03-30 | 苏州大学张家港工业技术研究院 | Phase encoding broadband photon sieve |
| CN107152998A (en) * | 2017-04-20 | 2017-09-12 | 苏州大学 | A kind of photon screen alignment methods based on detection Wavefront Coding system |
| CN108761606A (en) * | 2018-05-30 | 2018-11-06 | 苏州大学 | A kind of production method of splicing large-diameter photon sieve |
| CN110501768A (en) * | 2018-05-17 | 2019-11-26 | 苏州大学 | A kind of multispectral, big bandwidth photon screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017049886A1 (en) * | 2015-09-23 | 2017-03-30 | 苏州大学张家港工业技术研究院 | Phase encoding broadband photon sieve |
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| CN110501768A (en) * | 2018-05-17 | 2019-11-26 | 苏州大学 | A kind of multispectral, big bandwidth photon screen |
| CN108761606A (en) * | 2018-05-30 | 2018-11-06 | 苏州大学 | A kind of production method of splicing large-diameter photon sieve |
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| CN105137513B (en) | 2018-06-26 |
| WO2017049886A1 (en) | 2017-03-30 |
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