CN108572487A - A kind of round Darman raster photo orientated based on ferroelectric liquid crystals - Google Patents
A kind of round Darman raster photo orientated based on ferroelectric liquid crystals Download PDFInfo
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- CN108572487A CN108572487A CN201710870224.1A CN201710870224A CN108572487A CN 108572487 A CN108572487 A CN 108572487A CN 201710870224 A CN201710870224 A CN 201710870224A CN 108572487 A CN108572487 A CN 108572487A
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/141—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent using ferroelectric liquid crystals
-
- 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
- G02F1/1313—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 specially adapted for a particular application
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/141—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent using ferroelectric liquid crystals
- G02F1/1414—Deformed helix ferroelectric [DHL]
Abstract
A kind of based on photo orientated fast-response circle Dammam diffraction grating device, incident beam is diffracted into inferior brightness annulus at different levels by the invention, and realizes the automatically controlled response of Microsecond grade, can be applied to beam shaping, accurate measurement, image coding, super-resolution imaging etc..The automatically controlled round Darman raster device includes mainly preposition polarizing film, covers the photo orientated layer of optical glass, azo dyes, ferroelectric liquid crystal layer, postposition polarizing film and the drive system of indium tin oxide conductive film.The devices use re-expose technology carries out local sexual orientation to photo orientated layer so that ferroelectric liquid crystal layer is arranged according to exposure directions realizes round Darman raster structure, and diffraction efficiency is up to 84.5%.By designing ferroelectric liquid crystals differently- oriented directivity, and grating is relative to preposition polarizing film angle design, it can be achieved the switching of diffraction grating electric-controlled switch, 59 microsecond of response time improves nearly two orders of magnitude to the response time of liquid crystal diffraction optical device than existing nematic.
Description
Technical field
Ferroelectric liquid crystals circle Darman raster of the present invention is based on photo orientated manufacture craft, a kind of high diffraction
The quick response diffraction optical device of efficiency.
Background technology
Since diffraction optical device has, performance is good, the good characteristic such as small, becomes in optical system application
It is more and more important.Wherein, round Darman raster can be generated by using two-value formula, multivalue formula or continous way phase-modulation in far field
Equal strength annulus.Round Darman raster has many applications, it can be used for the accurate measurement of angle, area and lens focus,
The collimation that can also be used for laser measures or beam shaping.In addition, round Darman raster can be additionally used in super-resolution imaging and meter
It is counted as the optical image-coded of picture.Traditional round Darman raster be by transparent dielectric substrate etch different depth come
The incident light phase modulation of control, the complexity of manufacturing process limit the promotion of key performance.By optimizing electron beam lithography
Manufacturing process is, it can be achieved that the three rank circle diffraction patterns with extremely weak zero level order.But previous round Darman raster is static
, without electricity adjustability.Because liquid crystal has good automatically controlled dichroism, it is made to be widely used for optical phase modulator part.
Compared with nematic liquid crystal, ferroelectric liquid crystals fast response time is the main composition material of next-generation display technology and photonic device
Material.Therefore, based on the photo orientated round Darman raster of ferroelectric liquid crystals, a kind of tunable, low cost and quick response are realized
Equal strength concentric circles generator, for accurate measurement, beam shaping, image coding etc. optical tooling systems integrated design provide
Basis.
Invention content
The wanted technology of the present invention solves the problems, such as：A kind of ferroelectric liquid crystals circle Darman raster of quick response is provided, remote
Field realizes the circular ring shape diffractional field of each diffraction time isocandela distribution.
Technical solution of the invention is：A kind of round Darman raster photo orientated based on ferroelectric liquid crystals comprising：
Preposition polarizing film, the photo orientated layer of optical glass, azo dyes for covering indium tin oxide conductive film, ferroelectric liquid crystal layer, postposition are inclined
It shakes piece and drive system, as shown in Figure 1.
Preposition polarizing film and postposition polarizing film：Positioned at liquid crystal Dammam diffraction grating device front end, incident beam is converted
At linearly polarized light, and polarization direction is made to be parallel to the liquid crystal aligning direction of Darman raster central area, then this region refractive index is
no；The region liquid crystal aligning direction adjacent with central area is perpendicular to incident light polarization direction, refractive index ne.Postposition polarizing film
Saturating folk prescription is placed to the orthogonal thereto direction of preposition polarizing film.
Cover the optical glass and drive system of indium tin oxide conductive film：External driving electric field is provided for ferroelectric liquid crystal layer,
Ferroelectric liquid crystal molecule is set to arrange under the electric field driven of opposed polarity.
The photo orientated layer of azo dyes：SD-1 is dissolved in dimethylformamide (DMF) solvent with 0.5% concentration first
In, then solution is spin-coated on clean tin indium oxide (ITO) glass substrate, spin-coated layer first with 800RPM prewhirl within 5 seconds
Turn, is then rotated 30 seconds with 3000RPM.Then the soft baking that 10 minutes are carried out at 100 DEG C, can remove residual in SD-1 layers
Solvent is stayed, which generates the SD-1 films that thickness is about 10nm.By the glass substrate of spun SD-1 in polarization UV light (middle cardiac wave
Long 365nm, irradiation level I=5.5mW/cm2) under expose, generate first orientation direction.By the glass substrate by exposure for the first time
It is placed under mask plate, polarization UV light polarization directions is rotated by 90 °, irradiation level is constant, carries out re-expose, makes not by mask plate
Cover the SD-1 reorientations in region.At this point, then producing two orthogonal orientation areas on a glass substrate.
Ferroelectric liquid crystal layer：Using the substrate for being covered with oriented layer of preparation as side, do not have the ito glass substrate of oriented layer
As the other side, between two glass substrates by 9 μm of spacer folder so that the gap between two glass substrates is 9 μm, group
Dress up a liquid crystal cell.Ferroelectric liquid crystal material (FD4004N) is heated to 107 degrees Celsius of liquid underfills formed above to above-mentioned system
In standby liquid crystal cell, its cooling is then waited for.Ferroelectric liquid crystal material FD4004N is shown at a temperature of 72 DEG C, 85 DEG C and 105 DEG C respectively
Show the phase transformation of SmC* → SmA → N* → Iso.At room temperature, ferroelectric liquid crystals helical structure screw pitch is P0=350nm, spontaneous polarization
Ps ≈ 61nC/cm2,22.05 ° of inclination angle (semi-cone angle) θ ≈ are when on ferroelectric liquid crystal layer without External electrical field, ferroelectric liquid crystals spiral knot
Structure is arranged along differently- oriented directivity, and Fig. 2 illustrates arrangement texture of ferroelectric liquid crystals under the influence of photo orientated layer in the grating, adjacent
Region differently- oriented directivity is vertical.
Wherein, the anchoring energy of the photo orientated layer and ferroelectric liquid crystals elasticity modulus mutually balance each other so that ferroelectric liquid crystals spiral shell
Rotation structure is fully deployed under relatively low External electrical field, and obtains uniformly arrangement.
Wherein, the ferroelectric liquid crystal layer is under External electrical field, ferroelectric liquid crystals spontaneous polarization vector and External electrical field electric vector
Coupling, when load electric field strength is more than critical field strength (Ec, usually~0.1-1V/ μm), helical structure is fully expanded,
Ferroelectric liquid crystal molecule in each smectic layer is uniformly arranged, and arragement direction is related to applied field polarity.
Wherein, apply the forward voltage (＞ 0.5V/ μm) of some strength on the glass substrate of both sides, then ferroelectric liquid crystals spiral
Structure will be fully expanded, and when differently- oriented directivity and the saturating folk prescription of pre-polarizer are at 22.05 ° of angles, ferroelectric liquid crystal molecule will
Be switched to it is parallel/perpendicular to the uniform arrangement of polarizer, complete dark state is viewed as under petrographic microscope, as shown in Figure 3.
Wherein, apply the negative voltage (＞ 0.5V/ μm) of some strength on the glass substrate of both sides, then ferroelectric liquid crystals spiral
Structure will be fully expanded, and when differently- oriented directivity and the saturating folk prescription of pre-polarizer are at 22.05 ° of angles, ferroelectric liquid crystal molecule will
It is switched to the uniform arrangement at 44.1 ° of directions with polarizer, light state is viewed as under petrographic microscope, as shown in Figure 4.
The present invention is a little compared with existing Dammam diffraction grating device：The system realizes Binary-phase using ferroelectric liquid crystals
The switching of position grating, can carry out Microsecond grade switching between Diffraction State and non-diffraction state；Meanwhile the system utilizes azo light
Quick dyestuff carries out patterned orientation to ferroelectric liquid crystals, and spatial resolution is high, and diffraction efficiency is high, and capacity usage ratio is high.
Description of the drawings
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the preparation figure of the present invention；
Fig. 3 texture maps under no External electrical field for ferroelectric liquid crystals of the invention；
Fig. 4 texture maps under positive External electrical field for ferroelectric liquid crystals of the invention；
Fig. 5 texture maps under negative sense External electrical field for ferroelectric liquid crystals of the invention；
Fig. 6 is the far field construction pattern of the present invention.
Specific implementation mode
It will be described in detail principle, preparation process and the test performance of ferroelectric liquid crystals circle Darman raster diffraction herein.
Round Darman raster carries out binary as a kind of radial periodic phase grating, to the phase of incident light and periodically adjusts
System can generate the diffraction annulus with equal intensities in far field.Radial zone distribution t (r) with cycle T can be launched into just
The linear combination of string function：
Frequency spectrum is given by under its Fourier transformation：
Wherein q=ρ/λ f are spatial frequency, ρThe polar coordinates of image plane, f represent lens focus.
When the adjacent area of binary phase grat meets half-wave condition Δ nd=λ/2, diffraction occurs, far field realizes respectively
The circular ring shape diffractional field of diffraction time isocandela distribution.By taking 8 grades of round diffraction grating as an example, Fig. 5 is its far field construction pattern.
The content that description in the present invention is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (5)
1. a kind of ferroelectric liquid crystals circle Darman raster, which is characterized in that the diffraction grating is by ferroelectric liquid crystals based on photo orientated
What technology obtained；The ferroelectric liquid crystals is switched fast under extra electric field driving so that diffraction grating spreads out in Diffraction State with non-
Rapid translating between state is penetrated, the response time is 59 microseconds；The orientation layer material is azo dyes SD-1, in linear polarization UV illumination
It penetrates down, the differently- oriented directivity perpendicular to exposure polarization direction can be provided for liquid crystal layer；The photo orientated technology is to pass through secondary exposure
Light makes the liquid crystal aligning direction in adjacent two region in Darman raster be mutually perpendicular to.
2. ferroelectric liquid crystals circle Darman raster as described in claim 1, which is characterized in that the ferroelectric liquid crystals that the liquid crystal grating uses
Because making ferroelectric liquid crystals helical structure untwist with field coupling based on molecule spontaneous polarization vector under extra electric field, therefore and
The electrically conerolled birefringence characteristic of generation, and have the characteristics that fast response time.
3. ferroelectric liquid crystals circle Darman raster as described in claim 1, which is characterized in that the grating realizes each diffraction in far field
The circular ring shape diffractional field of level isocandela distribution.Light switch function is realized by applying external electrical field to ferroelectric liquid crystals.
4. a kind of preparation method of ferroelectric liquid crystals circle Darman raster, which is characterized in that include the following steps：
(1) SD-1 is dissolved in 0.5% concentration in dimethylformamide (DMF) solvent first, is then spin-coated on solution clearly
On clean tin indium oxide (ITO) glass substrate, spin-coated layer first carries out 5 seconds pre-rotations with 800RPM, then rotates 30 with 3000RPM
Second.Then the soft baking that 10 minutes are carried out at 100 DEG C, can remove the residual solvent in SD-1 layers, which generates thickness
The SD-1 films of about 10nm.
(2) by the glass substrate of spun SD-1 in polarization UV light (centre wavelength 365nm, irradiation level I=5.5mW/cm2) under expose
Light generates first orientation direction.
(3) it will be placed under mask plate by the glass substrate of exposure for the first time, polarization UV light polarization directions be rotated by 90 °, are irradiated
Spend it is constant, carry out re-expose, make the SD1 reorientations for not covered region by mask plate.At this point, then generating on a glass substrate
Two orthogonal orientation areas.
(4) using the substrate for being covered with oriented layer of preparation as side, do not have the ito glass substrate of oriented layer as the other side,
Between two glass substrates by 9 μm of spacer folder so that the gap between two glass substrates is 9 μm, is assembled into a liquid
Brilliant box.
(5) by ferroelectric liquid crystal material (FD4004N) be heated to 107 degrees Celsius of liquid underfills formed above to above-mentioned preparation liquid crystal
In box, its cooling is then waited for.Then when incident uniform linearly polarized light, then occurs the annulus of each diffraction time isocandela distribution in far field
Shape diffractional field, to which ferroelectric liquid crystals circle Darman raster be made.
5. the preparation method of the round Darman raster of ferroelectric liquid crystals as claimed in claim 4, which is characterized in that the step (2),
(3)：Since SD-1 layers of anchoring energies are influenced by exposure dose, it is also considered that arrive the thickness and elasticity modulus of ferroelectric liquid crystals, irradiation
10J/cm2UV light to generate best alignment conditions.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375426A (en) * | 2018-12-14 | 2019-02-22 | 中国科学院长春光学精密机械与物理研究所 | A kind of unilateral orientation active liquid crystal polarization grating structure and preparation method thereof |
| US20210063841A1 (en) * | 2019-08-28 | 2021-03-04 | The Hong Kong University Of Science And Technology | Ferroelectric liquid crystals dammann grating for light detection and ranging devices |
| CN113267899A (en) * | 2021-06-07 | 2021-08-17 | 南京邮电大学 | Method for generating multiple coaxial orbit orbital angular momentum states at one time |
| WO2022057738A1 (en) * | 2020-09-21 | 2022-03-24 | The Hong Kong University Of Science And Technology | High-contrast ferroelectric liquid crystal cell |
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| CN1145122A (en) * | 1994-02-09 | 1997-03-12 | 英国国防部 | Ferroelectric liquid crystal device alignment |
| CN104932170A (en) * | 2015-05-19 | 2015-09-23 | 南京大学 | Liquid crystal forked polarization grating and production method thereof |
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2017
- 2017-09-22 CN CN201710870224.1A patent/CN108572487A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1145122A (en) * | 1994-02-09 | 1997-03-12 | 英国国防部 | Ferroelectric liquid crystal device alignment |
| CN104932170A (en) * | 2015-05-19 | 2015-09-23 | 南京大学 | Liquid crystal forked polarization grating and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| FAN FAN等: "《Ferroelectric Liquid Crystal Dammann Grating by Patterned Photoalignment》", 《CRYSTALS》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375426A (en) * | 2018-12-14 | 2019-02-22 | 中国科学院长春光学精密机械与物理研究所 | A kind of unilateral orientation active liquid crystal polarization grating structure and preparation method thereof |
| US20210063841A1 (en) * | 2019-08-28 | 2021-03-04 | The Hong Kong University Of Science And Technology | Ferroelectric liquid crystals dammann grating for light detection and ranging devices |
| US11880114B2 (en) * | 2019-08-28 | 2024-01-23 | The Hong Kong University Of Science And Technology | Ferroelectric liquid crystals Dammann grating for light detection and ranging devices |
| WO2022057738A1 (en) * | 2020-09-21 | 2022-03-24 | The Hong Kong University Of Science And Technology | High-contrast ferroelectric liquid crystal cell |
| CN113267899A (en) * | 2021-06-07 | 2021-08-17 | 南京邮电大学 | Method for generating multiple coaxial orbit orbital angular momentum states at one time |
| CN113267899B (en) * | 2021-06-07 | 2022-04-12 | 南京邮电大学 | Method for generating multiple coaxial orbit orbital angular momentum states at one time |
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