WO2002084387A1 - Dispositif a cristal liquide a commutation par photoinduction - Google Patents
Dispositif a cristal liquide a commutation par photoinduction Download PDFInfo
- Publication number
- WO2002084387A1 WO2002084387A1 PCT/JP2001/009465 JP0109465W WO02084387A1 WO 2002084387 A1 WO2002084387 A1 WO 2002084387A1 JP 0109465 W JP0109465 W JP 0109465W WO 02084387 A1 WO02084387 A1 WO 02084387A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- liquid crystal
- light
- crystal device
- induced
- photo
- Prior art date
Links
Classifications
-
- 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
- G02F1/133362—Optically addressed liquid crystal cells
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/06—Non-steroidal liquid crystal compounds
- C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
- C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
- C09K19/24—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings linked by a chain containing nitrogen-to-nitrogen bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
-
- 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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133734—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by obliquely evaporated films, e.g. Si or SiO2 films
Definitions
- the present invention relates to a light-induced switching liquid crystal device.
- Liquid crystals are extremely anisotropic substances, and their optical properties can be changed very easily by various external fields such as electric field, magnetic field, mechanical flow, temperature, light, etc. You.
- the change in the orientation of the liquid crystal by photoexcitation has attracted much attention because of its potential as a photonic device.
- the photoexcited Freedericks transition is based on the huge optical nonlinearity of liquid crystal molecules, and has attracted much interest during the last 20 years.
- the light gives a direct rotational torque to the liquid crystal molecules, causing an orientation change in a specific direction.
- the direction in which the liquid crystal is directed by light depends on various experimental conditions, such as the alignment direction of the liquid crystal before irradiation, the cell thickness, and the light intensity.
- the most relevant to the study of the present inventors is the photoexcited anchoring transition in dichroic Abbe: / Zen liquid crystal, which is induced by the change in shape at the molecular level due to the photoisomerization process. It is caused by modulation of macroscopic surface anchoring conditions. That is, as reported by the present inventors, as a result of photoisomerization, the azobenzene molecule is more selectively adsorbed on the solid surface as a result of the conversion from the trans form to the cis form, resulting in the liquid crystal.
- the anchoring condition for changes That is, when the adsorption of azobenzene molecules on the solid surface exceeds a certain concentration, the macroscopic alignment of the liquid crystal changes from horizontal alignment to vertical alignment.
- the bi-stable (two-state degenerate) in-plane switching phenomenon caused by the competition of the anchoring force in the Si x x substrate, and the anchoring transition phenomenon caused by the photoisomerization of the conventional azobenzene liquid crystal molecule.
- the angle of the anisotropic axis can be rotated by nearly 90 degrees by optical excitation, and the switching time can be reduced to less than a second, which enables a much higher speed as compared with the conventional optical excitation in-plane switching control method.
- the present invention has been made in view of the above circumstances, and has as its object to provide a high-speed and highly practical light-induced switching liquid crystal device.
- a light-induced switching liquid crystal device the optically anisotropic axis of a dichroic nematic liquid crystal is light-induced switched by light in a horizontal plane at a high speed.
- the light-induced switching according to the above In a liquid crystal device, ultraviolet light is irradiated as the light, and azobenzene liquid crystal molecules are converted from trans to cis.
- FIG. 1 is a schematic diagram of an experimental device for a light-induced switching liquid crystal device showing an embodiment of the present invention.
- FIG. 2 is a diagram schematically illustrating a region of bistable anchoring according to the present invention.
- C FIG. 3 is a diagram illustrating temperature dependence of an azimuth angle ⁇ according to the present invention.
- -FIG. 4 is a view showing a photograph of the sample after light irradiation according to the present invention, observed at two different positions under a mouth snicole.
- FIG. 5 is a schematic diagram of trans-cis photoisomerization of 4-hexyloxy (4′-hexyl) abbenzene molecule according to the present invention.
- FIG. 6 is a schematic diagram showing a state in which the cis-isomer molecule according to the present invention is fixed on a solid surface.
- a general sandwich type liquid crystal cell was used.
- This liquid crystal cell is By diagonally depositing and coating a SiO x thin film on two glass substrates having an ITO electrode, the orientation of the nematic liquid crystal can be bistable.
- the deposition conditions for the S i Ox thin film are extremely important for achieving such a bistable anchoring state.
- the cell spacing was 6; zm (according to a normal vapor-deposited SiO 2 sensor), and the liquid crystal material was sealed in the cell in an isotropic phase.
- the dichroic nematic liquid crystal used is 4-hexyloxy- (4'-l-xy1) azobenzene, and has the following molecular structure and phase sequence.
- FIG. 1 is a schematic view of an experimental apparatus for a photo-induced switching liquid crystal device showing an embodiment of the present invention.
- the sample is placed on a temperature-controlled hot stage 4 mounted on a rotating stage of a polarizing microscope.
- the orientation direction of the liquid crystal in the cell was examined between two orthogonal polarizing plates using light passing through an optical filter 2 that cuts light having a wavelength of 580 nm or less.
- 7 is a dichroic mirror.
- the cut-off wavelength of the filter 2 used as the observation light source was selected from three dichroic nematic liquid crystals and a wavelength that did not cause photoisomerization during observation.
- FIG. 2 c This figure is a diagram of the area of the bistable anchoring in the present invention schematically showing, S i O x angle in caused by oblique deposition of nematic bistable Joka anchoring condition Schematic of the liquid crystal (for simplicity, only one of the two possible liquid crystal orientations is shown; the other is symmetrically opposite the deposition plane YZ).
- the alignment direction of the liquid crystal that is, the direction of the optically anisotropic axis, is determined by ⁇ and ⁇ , that is, declination and polar angle.
- Figure 2 (a) shows the temperature-induced optical axis changes, each position and 2, temperature, and orientation direction of the liquid crystal in T 2, a ⁇ T 2. Following the trajectory on a plane perpendicular to the ⁇ plane and at an angle of ⁇ with the ⁇ plane, determined by the following equations (1) and (2), the orientation of the liquid crystal changes from the evaporation plane ⁇ ⁇ It goes away.
- FIG. 2 (b) shows the light-induced optical axis change, and the optical axis of the sample changes from the deposition plane toward the X-axis as in the case of FIG. 2 (a). (For a more detailed description, please refer to the preceding precedence: 5: Offerings (15) to (17)).
- the region of bistable anchoring is confined between two different monostable states, a horizontal state and a tilted state.
- the alignment directions of the horizontal and tilt liquid crystals are in the X-axis direction and the YZ plane, respectively.
- the alignment direction of the liquid crystal branches into two symmetrical directions on both sides of the deposition plane.
- the optically anisotropic axis that is, the alignment direction of the liquid crystal is located at a position shifted from the evaporation plane YZ by about ⁇ 210 degrees. It was found that when the temperature was increased, the optically anisotropic axis moved from the deposition plane toward the X-axis.
- Figure 2 (a) is different from the temperature T, the direction of the optical anisotropic axis of the T 2 schematically illustrates, at a temperature near the clearing point 7 0 ° C, the optical anisotropic axis is along the X-axis I understood that.
- FIG. 3 shows the temperature dependence of the azimuth angle ⁇ in the present invention, in which the vertical axis represents the azimuth angle and the horizontal axis represents the temperature. This is very similar to the result reported in the preceding reference (15).
- the temperature of the sample is set to 36, that is, the temperature just before the temperature-induced optical anisotropic axis shift occurs.
- the sample is irradiated with the excitation light through the aperture for a very short time of less than 1 second. It can be seen that the sample irradiated with light has shifted in the X-axis direction [Fig. 2 (b)].
- Fig. 4 shows photographs of the sample after light irradiation observed under crossed Nicols at two different positions.
- Fig. 4 is a photograph of a dichroic nematic liquid crystal in which a bistable anchoring state is realized by a SiO x thin film.
- the sample temperature is fixed at 36 ° C, and Photographs were taken after irradiation with 60 nm light for less than 1 second. The area in the center of the photo is the illuminated area, and the two photographs are observations of another location under crossed Nicols.
- Fig. 4 (a) shows the case where the optical axis of the light-irradiated area is at the transmission position of one of the polarizers
- Fig. 4 (b) shows that the optical axis of the area not irradiated with the light has the optical axis In this case, the sample is rotated clockwise as shown by the arrow so that it comes to the position.
- the deviation of the optical axis is about 50 degrees.
- Small orientation domains in the unilluminated areas are landmarks to record the position of the sample.
- the difference between the two positions corresponds to the part of the cell that was exposed to light and the part that was not. From these two photographs, the rotation of the anisotropic axis in the horizontal (in-plane) direction induced by light is shown. It turns out that the rotation is about 50 degrees. For longer exposure times, on the order of 2 seconds, the change in the anisotropic axis is about 80 degrees.
- theoretical models predict that two second-order transitions will occur at and below T N1 and T0, respectively.
- the liquid crystal alignment direction changes in a pseudo-horizontal (in-plane) direction when the temperature of the sample is increased due to the coupling between ⁇ and ⁇ .
- the presence of cis isomers not only affects surface phenomena, but also the anchoring of liquid crystal molecules to the surface. Most likely, the presence of the cis isomer reduces the order S ⁇ and S ⁇ of the liquid crystal on the surface. Therefore, the transition temperature and ⁇ 0 decrease. As a result, in the liquid crystal cell in the bi-stabilized anchoring state, the in-plane orientation changes due to light irradiation. In other words, the temperature is lower than the temperature expected from the transition temperature of the temperature-induced anchoring transition, and it can be said that the light-induced orientation change occurs at the temperature.
- the temperature of the sample was set very close to the clear point ⁇ , and light irradiation was performed for 5 seconds. An extremely small change in the transition temperature ⁇ ⁇ (1 (below 1 ° C) was measured. From these results, it can be said that the change in photoexcitation orientation due to the heating effect of the excitation light can be ignored sufficiently.
- the photo-induced phase transition is expected to reach 90 degrees.
- a large change in the direction of the anisotropic axis is very interesting not only for liquid crystal devices that use the operating principle based on amplitude modulation, but also for devices that use phase modulation of light.
- the present invention is not limited to the above embodiments, and various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
- high-speed in-plane switching can be performed by optically inducing an optically anisotropic axis of a dichroic nematic liquid crystal.
- the switching time is extremely fast, about 2 seconds. More design with dichroic LCD Fast switching will also be possible.
- the photo-induced phase transition is expected to reach 90 degrees.
- the photo-induced switching liquid crystal device of the present invention is applicable to all optical applied technologies such as liquid crystal-optical communication and optical memory.
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Liquid Crystal (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01980926A EP1385040B1 (en) | 2001-04-10 | 2001-10-29 | Photoinduced switching liquid crystal device |
US10/473,598 US7298429B2 (en) | 2001-04-10 | 2001-10-29 | Photoinduced switching liquid crystal device utilizing photoisomerization |
KR1020037013125A KR100592199B1 (ko) | 2001-04-10 | 2001-10-29 | 광유기 스위칭 액정 디바이스 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-111049 | 2001-04-10 | ||
JP2001111049A JP3401500B2 (ja) | 2001-04-10 | 2001-04-10 | 光誘起スイッチング液晶デバイス |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002084387A1 true WO2002084387A1 (fr) | 2002-10-24 |
Family
ID=18962720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/009465 WO2002084387A1 (fr) | 2001-04-10 | 2001-10-29 | Dispositif a cristal liquide a commutation par photoinduction |
Country Status (6)
Country | Link |
---|---|
US (1) | US7298429B2 (ja) |
EP (1) | EP1385040B1 (ja) |
JP (1) | JP3401500B2 (ja) |
KR (1) | KR100592199B1 (ja) |
TW (1) | TW567351B (ja) |
WO (1) | WO2002084387A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7854505B2 (en) | 2006-03-15 | 2010-12-21 | The Board Of Trustees Of The University Of Illinois | Passive and active photonic crystal structures and devices |
JP5232426B2 (ja) * | 2007-09-20 | 2013-07-10 | 日東電工株式会社 | リオトロピック液晶性混合物、及びコーティング液、及び光学異方性フィルム |
CN112048279B (zh) * | 2020-09-11 | 2022-04-26 | 为远材料科技(辽宁)有限责任公司 | 光释放胶及其制备方法和石墨烯的转移方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5443759A (en) * | 1977-09-13 | 1979-04-06 | Citizen Watch Co Ltd | Liquid crystal color display device |
JPH04366834A (ja) * | 1991-06-13 | 1992-12-18 | Agency Of Ind Science & Technol | 三安定光制御光学素子 |
JPH0519260A (ja) * | 1991-07-09 | 1993-01-29 | Victor Co Of Japan Ltd | 液晶ライトバルブ |
JPH0815661A (ja) * | 1994-07-01 | 1996-01-19 | Dainippon Ink & Chem Inc | 光スイッチング方法 |
JPH09296174A (ja) * | 1996-03-08 | 1997-11-18 | Showa Shell Sekiyu Kk | アゾ結合を有する新規光学活性化合物を利用した液晶素子 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4974941A (en) * | 1989-03-08 | 1990-12-04 | Hercules Incorporated | Process of aligning and realigning liquid crystal media |
DE69732193T2 (de) * | 1996-05-08 | 2005-12-22 | Hitachi, Ltd. | In der Ebene schaltende Flüssigkristallanzeige mit aktiver Matrix |
JP3879805B2 (ja) * | 1999-07-02 | 2007-02-14 | 富士ゼロックス株式会社 | 光学フィルタリング装置および方法 |
JP2001329265A (ja) * | 2000-05-22 | 2001-11-27 | Minolta Co Ltd | 液晶表示素子 |
-
2001
- 2001-04-10 JP JP2001111049A patent/JP3401500B2/ja not_active Expired - Fee Related
- 2001-10-29 EP EP01980926A patent/EP1385040B1/en not_active Expired - Lifetime
- 2001-10-29 KR KR1020037013125A patent/KR100592199B1/ko not_active IP Right Cessation
- 2001-10-29 WO PCT/JP2001/009465 patent/WO2002084387A1/ja active IP Right Grant
- 2001-10-29 US US10/473,598 patent/US7298429B2/en not_active Expired - Fee Related
- 2001-11-06 TW TW090127482A patent/TW567351B/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5443759A (en) * | 1977-09-13 | 1979-04-06 | Citizen Watch Co Ltd | Liquid crystal color display device |
JPH04366834A (ja) * | 1991-06-13 | 1992-12-18 | Agency Of Ind Science & Technol | 三安定光制御光学素子 |
JPH0519260A (ja) * | 1991-07-09 | 1993-01-29 | Victor Co Of Japan Ltd | 液晶ライトバルブ |
JPH0815661A (ja) * | 1994-07-01 | 1996-01-19 | Dainippon Ink & Chem Inc | 光スイッチング方法 |
JPH09296174A (ja) * | 1996-03-08 | 1997-11-18 | Showa Shell Sekiyu Kk | アゾ結合を有する新規光学活性化合物を利用した液晶素子 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1385040A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1385040A4 (en) | 2004-06-09 |
TW567351B (en) | 2003-12-21 |
US20040131797A1 (en) | 2004-07-08 |
EP1385040A1 (en) | 2004-01-28 |
EP1385040B1 (en) | 2007-07-18 |
KR20030085100A (ko) | 2003-11-01 |
JP2002311407A (ja) | 2002-10-23 |
KR100592199B1 (ko) | 2006-06-23 |
JP3401500B2 (ja) | 2003-04-28 |
US7298429B2 (en) | 2007-11-20 |
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