CN108761891A - A kind of wide range polarization grating optimization method based on compensation of refractive index - Google Patents
A kind of wide range polarization grating optimization method based on compensation of refractive index Download PDFInfo
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- CN108761891A CN108761891A CN201810630409.XA CN201810630409A CN108761891A CN 108761891 A CN108761891 A CN 108761891A CN 201810630409 A CN201810630409 A CN 201810630409A CN 108761891 A CN108761891 A CN 108761891A
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- polarization grating
- wide range
- refractive index
- liquid crystal
- polarization
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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
- G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133502—Antiglare, refractive index matching layers
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
A kind of wide range polarization grating optimization method based on compensation of refractive index is to transmit the optimization method that perturbation of spectrum is proposed for elimination wide range polarization grating (Broadband Polarization Grating).The present invention increases one layer of glass structure on the basis of wide range polarization grating structure, by refractive index difference between reducing medium to weaken the interference that film interference is brought, has effectively contained the disturbance of transmissivity, has improved the homogeneity of wide range polarization grating transmitance.
Description
Technical field
Wide range liquid crystal polarization gratings of the present invention can realize the optical rotation of high-diffraction efficiency in wider spectral coverage
It changes.The present invention effectively inhibits the thin film interference effects of grating, realizes in wide spectrum and stablize by increasing by one layer of compensation medium
High transmittance.
Background technology
Liquid crystal polarization gratings are a kind of micronano optical devices, it can (nearly 100%) will be a branch of with high transfer efficiency
Non-polarized light is converted to two beam elliptically polarized lights.Improved wide range polarization grating can also be realized efficiently to be turned compared in broadband
It changes, can be used for making the efficient polarizers such as 100% polarizing film.
However, in the emulation and manufacturing process of liquid crystal polarization gratings, due to the presence of film interference, as shown in Figure 1, making
The transmission spectrum of wide spectrum polarization grating there is larger disturbances, the transmitance of polarization grating can be reduced, influence the inclined of device
Shake conversion effect.As shown in Fig. 2, being plated in SiO2 substrates in polarization grating, when directly being contacted with air, different wave length is corresponding
Transmitance disturbance is more violent, not only causes certain energy loss, the transmitance difference of different wavelengths of light will also result in one
Fixed cross-color.A kind of method is needed to solve the problems, such as that transmitance disturbs.
Film interference is the main reason for causing transmitance to disturb, so optimization aim is exactly to eliminate film interference.Film
Caused by interference is the reflection by film layer and other medium intersections.The general thinking for eliminating film interference is that control film layer is thick
Degree achievees the effect that decrease or eliminates a certain wave film interference.But when due to changing polarization grating thickness, wherein cardiac wave
Length can also change, and wide range polarization grating need to all wavelengths have it is good penetrate effect, so can not be by changing
The method of Varying-thickness solves the problems, such as film interference.
Another method for solving film interference is to use compensation of refractive index, that is, is rolled over polarization grating material using a kind of
It penetrates material similar in rate to contact, the reflection of medium intersection can be obviously reduced, to inhibit film interference.For liquid
It is more feasible using the method for compensation of refractive index for brilliant polarization grating.
Invention content
The wanted technology of the present invention solves the problems, such as：A kind of optimization structure is provided, to weaken the transmitance of wide range polarization grating
Perturbed problem.
Technical solution of the invention is：One layer and its material is deposited on the surface that wide range polarization grating is contacted with air
The compensation film layer of refractive index close.
Compensate film layer：For carrying out compensation of refractive index to weaken film interference.The selection of its material should comply at following 3 points
It is required that：
● refractive index is close with polarization grating Refractive Index of Material
● dispersion is small, reduces the introducing of material aberration to the greatest extent.
● alternative costs are low as possible, the material of mature preparation process
SiO2 (n=1.47) is such as selected to meet above-mentioned requirements as the material of compensation film layer.Increase compensation film layer to reduce
Refractive index difference, to reduce the film interference of polarization grating.Its principle is as shown in formula 1, upper layer and lower layer in film interference
The optical path difference of reflected at interfaces light
D is the thickness of crystalline film, n1,n2The respectively refractive index of medium and crystal, i are incident light and interface angle,
90 ° are taken when normal incidence, λ is lambda1-wavelength.Due to the presence of half-wave loss, as n1 ≈ n2, for arbitrary wavelength light and
Speech, reflection is most weak, and transmission is most strong, and film interference is significantly reduced.In this way, just solving the problems, such as transmitance disturbance.In addition, mending
Film layer is repaid to play the role of protecting polarization grating, extend the service life of device with dustproof and waterproof.
Using the structure after optimization, can achieve the effect that reduce transmitance disturbance well, as shown in Figure 3.Increasing
Film layer is compensated with after anti-reflection film, the transmitance of each wavelength, which has, to be obviously improved (more than 99.5%), and disturbance is obviously reduced
(disturbance is in ± 0.5% range), has reached good effect of optimization.
Description of the drawings
Fig. 1 film interference principle schematics
Wide range polarization grating structural schematic diagram after Fig. 2 optimizations
Fig. 3 diffraction efficiencies disturb schematic diagram
Fig. 4 increases diffraction efficiency figure after compensation film layer
Claims (5)
1. a kind of wide range polarization grating optimization method based on compensation of refractive index, which is characterized in that the wide range polarization grating uses
The encapsulating structure of upper layer and lower layer medium.By matching the refractive index of polarization grating and encapsulation medium, wide range is on the one hand reduced
On the one hand the transmitance perturbed problem of polarization grating has protection polarization grating, the advantage of dustproof and waterproof.
2. wide range polarization grating optimization structure as described in claim 1 is followed successively by (1) compensation film layer from top to bottom, (2) are chiral
Polarization grating, (3) opposite-handed polarization grating, (4) substrate of glass.Wherein compensation film layer is compensation of refractive index and device protection
Nuclear structure.
3. wide range polarization grating optimization method as described in claim 1 is using the liquid crystal material refractive index with polarization grating
Similar material is covered in the surface of polarization grating as compensation film layer.Such structure significantly reduces thin film interference effects
Influence to transmitance.
4. liquid crystal polarization gratings as described in claim 1 are a kind of diffraction grating based on liquid crystal, liquid crystal molecule main shaft square
Change in sinusoidal rule to space coordinate, characteristic is non-polarized incident light being beamed into several with different polarization states
Sub-light wave.Liquid crystal polarization gratings are operated under the conditions of half-wave, i.e., meet best match to single wavelength, are presented close to 100%
Diffraction efficiency.
5. wide spectrum polarizing liquid crystal grating as described in claim 1 widens polarised light using the method for multilayer chiral liquid crystal superposition
The effective bandwidth of grid, two layers of chiral layers superposition is with Δ λ/λ~56%, and theoretical diffraction efficiency is in 85% -93% range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810630409.XA CN108761891A (en) | 2018-06-19 | 2018-06-19 | A kind of wide range polarization grating optimization method based on compensation of refractive index |
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| CN201810630409.XA CN108761891A (en) | 2018-06-19 | 2018-06-19 | A kind of wide range polarization grating optimization method based on compensation of refractive index |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1391662A (en) * | 1999-11-19 | 2003-01-15 | 康宁股份有限公司 | Lateral field based liquid crystal gratings |
| US20040239869A1 (en) * | 2003-06-02 | 2004-12-02 | Cavanaugh Shanti A. | Narrow band tunable filter with integrated detector |
| CN1965250A (en) * | 2004-06-25 | 2007-05-16 | 诺思罗普格鲁曼公司 | Optical compensation of cover glass-air gap-display stack for high ambient lighting |
| CN101657741A (en) * | 2007-04-16 | 2010-02-24 | 北卡罗莱纳州立大学 | Multi-layer achromatic liquid crystal polarization gratings and relative manufacturing process |
| CN202210190U (en) * | 2011-07-26 | 2012-05-02 | 信利半导体有限公司 | 3D (three dimensional) display module and mobile phone |
| JP2013007781A (en) * | 2011-06-22 | 2013-01-10 | Citizen Holdings Co Ltd | Liquid crystal device |
| CN103472521A (en) * | 2007-04-16 | 2013-12-25 | 北卡罗莱纳州立大学 | Low-twist chiral liquid crystal polarization gratings and related fabrication methods |
| CN106575007A (en) * | 2014-07-31 | 2017-04-19 | 北卡罗莱纳州立大学 | Bragg liquid crystal polarization gratings |
| CN106918932A (en) * | 2017-03-09 | 2017-07-04 | 苏州晶萃光学科技有限公司 | A kind of optically controlled liquid crystal spatial light modulator and its application |
-
2018
- 2018-06-19 CN CN201810630409.XA patent/CN108761891A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1391662A (en) * | 1999-11-19 | 2003-01-15 | 康宁股份有限公司 | Lateral field based liquid crystal gratings |
| US20040239869A1 (en) * | 2003-06-02 | 2004-12-02 | Cavanaugh Shanti A. | Narrow band tunable filter with integrated detector |
| CN1965250A (en) * | 2004-06-25 | 2007-05-16 | 诺思罗普格鲁曼公司 | Optical compensation of cover glass-air gap-display stack for high ambient lighting |
| CN101657741A (en) * | 2007-04-16 | 2010-02-24 | 北卡罗莱纳州立大学 | Multi-layer achromatic liquid crystal polarization gratings and relative manufacturing process |
| CN103472521A (en) * | 2007-04-16 | 2013-12-25 | 北卡罗莱纳州立大学 | Low-twist chiral liquid crystal polarization gratings and related fabrication methods |
| JP2013007781A (en) * | 2011-06-22 | 2013-01-10 | Citizen Holdings Co Ltd | Liquid crystal device |
| CN202210190U (en) * | 2011-07-26 | 2012-05-02 | 信利半导体有限公司 | 3D (three dimensional) display module and mobile phone |
| CN106575007A (en) * | 2014-07-31 | 2017-04-19 | 北卡罗莱纳州立大学 | Bragg liquid crystal polarization gratings |
| CN106918932A (en) * | 2017-03-09 | 2017-07-04 | 苏州晶萃光学科技有限公司 | A kind of optically controlled liquid crystal spatial light modulator and its application |
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Application publication date: 20181106 |