217results about How to "High birefringence" patented technology

Waveplate, planar lightwave circuit incorporating the waveplate, and method of making an optical device. The waveplate is formed of a mesogen-containing polymer film having a backbone and sidechains containing mesogen groups. The waveplate may be formed by producing a mesogen-containing polymer film having a nonzero birefringence of suitable dimensions for insertion into a planar lightwave circuit. The waveplate may be so inserted into an optical circuit of a planar lightwave circuit so that an optical signal traversing the waveplate is changed, for instance, to have two polarization states.

A light-scattering film 10 is obtained by subjecting a birefringent material in a resin layer to orientation treatment, in which at least one component selected from a transparent resin 6 and a scattering material 7 is the birefringent material (e.g., a birefringent resin, a liquid crystalline material). According to the light-scattering film, in the case where a linear polarized light in which a vibrating direction and a propagating direction exist in a plane containing a surface-directional axis of the film and a thickness-directional axis of the film is incident at a film surface, the rectilinear transmittance of the incident light shows maximum at an oblique incident direction to the film surface (e.g., incident angle of 20 to 89°). The rectilinear transmittance of the incident light from a direction perpendicular to the film surface is 0 to 30%, and the rectilinear transmittance of the incident light from an oblique direction having an incident angle of 40 to 70° to the film surface is 50 to 100%. Directivity in a light-scattering property of the light-scattering film is improved, and even when an incident light comes from an oblique direction, brightness of the display surface from a front direction is improved. Therefore, the film is useful for employing in combination with a polarized plate of the liquid crystal display apparatus.

Curable thiol-ene compositions containing urethane (meth)acrylate oligomers that are readily polymerized to produce optical articles and coatings are described.

A method for controlling positive birefringence in an optical compensation film (positive C-plate) having high positive birefringence throughout the wavelength range 400 nm<λ<800 nm is provided. The method includes selecting polymers with optically anisotropic subunits (OASUs) that exhibit the buttressing effect, wherein the OASUs may be disks, mesogens or aromatic rings substituted with birefringence enhancing substituents. The method further includes processing the polymer by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. These optical compensation films may be used in LCDs, particularly IPS-LCDs.

Optical compensation films (positive C-plate) with anisotropic subunits (OASUs) that are aromatic rings substituted with birefringence enhancing substituents (BES) and have high positive birefringence throughout the wavelength range 400 nm<λ<800 nm are provided. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Such optical compensation films are suitable for use as a positive C-plate in LCDs, particularly IPS-LCDs.

The invention provides a liquid crystal composition and an application thereof. Based on 100 percent by mass of the composition, the liquid crystal composition comprises the following components in percentage by mass: 0-70 percent of a nematic liquid crystal compound shown as a formula I, 0-50 percent of a nematic liquid crystal compound shown as a formula II, 0-50 percent of a nematic liquid crystal compound shown as a formula III, 0-30 percent of a nematic liquid crystal compound shown as a formula IV and 0-30 percent of a nematic liquid crystal compound shown as a formula V. The liquid crystal composition has high birefringence rate, and has the characteristics of high upper limit temperature of a nematic phase, low lower limit temperature of the nematic phase, low rotation viscosity, high response speed and the like. The liquid crystal composition provided by the invention can be applied in the fields of variable-focus liquid crystal lenses and the like.

An optical material having a high birefringence and a small absolute value of a photoelastic coefficient is provided by use of a resin composition for an optical material comprising a resin (a) having a positive photoelastic coefficient and a negative inherent birefringence and a resin (b) having a negative photoelastic coefficient and a negative inherent birefringence.

The invention relates to a compound potassium lead borophosphate nonlinear optical crystal as well as a preparation method and application thereof. The compound has the chemical formula of KPbBP2O8. The preparation method comprises the following steps of: after uniformly mixing a raw material containing K, Pb, B and P by adopting a solid-phase reaction method, heating for carrying out solid-phase reaction to obtain a compound of the potassium lead borophosphate; and growing a crystal on the compound by adopting a melt method to obtain the potassium lead borophosphate nonlinear optical crystal. The compound is the centimeter-grade large size nonlinear optical crystal of a tetragonal crystal system; a space group is I-42d; cell parameters comprise a=7.1764(7), b=7.1764(7), c=13.9483(13), Z=4 and V=718.35; the powder frequency doubling effect of the compound is equivalent to that of KDP (Potassium Dihydrogen Phosphate); the Mohs hardness is 4 to 5; and the potassium lead borophosphate nonlinear optical crystal has the advantages of easy cutting, polishing processing and storage, no deliquescence, high preparation speed, simple operation, low cost, good mechanical performance, difficult cracking, stable physicochemical property, and the like and is suitable for manufacturing an nonlinear optical device.

The invention relates to a transflective LCD, which comprises a first substrate, a second substrate opposite to the first substrate, a liquid crystal layer between the first substrate and the second substrate, a first polaroid sheet arranged on the surface of the outside of the first substrate, a second polaroid sheet arranged on the surface of the outside of the second substrate, a common electrode layer, an insulating layer, a pixel electrode layer and a second alignment layer which are arranged on the surface of the inside of the second substrate in order, and a control electrode layer and a first alignment layer which are arranged on the surface of the inside of the first substrate, wherein the common electrode layer comprises a transmittance zone and a reflective zone; the control electrode layer is positioned in a zone corresponding to the transmittance zone, and is applied with a voltage, so that the inclination angle of liquid crystal molecules corresponding to the transmittance zone is larger than that of liquid crystal molecules corresponding to the reflective zone, and the birefringence of the liquid crystal molecules corresponding to the transmittance zone is improved. The transflective LCD does not need an internal delay chip to reduce the cost.

The invention relates to a nematic liquid crystal composition. The composition contains at least a nematic liquid crystal compound as shown in the formula (I), at least a nematic liquid crystal compound as shown in the formula (II), at least a nematic liquid crystal compound as shown in the formula (III), at least a nematic liquid crystal compound as shown in the formula (IV), at least a nematic liquid crystal compound as shown in the formula (V) and at least an optionally optically active compound. The nematic liquid crystal composition provided by the invention has high birefringence, low visco-elastic coefficient ratio gamma 1 / k11 and a wide phase transition temperature range. In addition, the liquid crystal composition has high ultraviolet ray stability and high thermal stability.

An optical film whose retardation distribution is uniform, whose rainbow-like irregularity is suppressed, whose color is transparent and whose optical characteristics are extremely good is provided. A birefringent material containing a non-liquid crystal polymer is dissolved in methyl isobutyl ketone so as to prepare a coating solution. This coating solution is applied onto a transparent film, thus forming a coating film. By drying the coating film, an optical film having a birefringent layer formed on the transparent film is obtained. As the non-liquid crystal polymer, it is possible to use polyimide that has a birefringence (Δnxyz) in a thickness direction when formed into a film of at least 0.03 and is soluble in methyl isobutyl ketone.

The invention belongs to the field of liquid crystal display and particularly discloses a liquid crystal composite film with a writing display function and a preparation method thereof. The liquid crystal composite film with the writing display function comprises a PET transparent film, a PVA insulating orientation layer, a liquid crystal / polymer / interval microsphere composite layer and a PET black film sequentially from top to bottom. The lower surface of the PET transparent film is coated with an ITO layer, and the upper surface of the PET black film is coated with an ITO layer. The liquid crystal composite film with the writing display function and the preparation method thereof have advantages that due to addition of the PVA insulating orientation layer, short circuit risks of two conductive layers are avoided, and accordingly the rate of finished products is sharply increased, service lives of the products are greatly prolonged, production cost is reduced, and the driving voltage of the liquid crystal film is lowered to increase key technical indexes such as brightness and contrast ratio of the film.

The invention relates to the technical field of T-Hz waveguide and provides a high-birefringence sub-wavelength porous T-Hz optical fiber. An ellipse ventage structure of which the size is much smaller than the wave length is added in an optical fiber core of the high-birefringence sub-wavelength porous T-Hz optical fiber; and the invention has the sub-wavelength mode bound capability while the high birefringence is provided at the T-Hz wave band, and also has high-birefringence property in the wider T-Hz bandwidth. The high-birefringence sub-wavelength porous T-Hz optical fiber can be used for the manufacturing of a sub-wavelength size T-Hz device, thereby being applied in the fields of sensing and detection and communication of T-Hz.

The invention discloses a high-birefringence nematic phase liquid crystal material which is prepared by mixing the following components in percentage by mass: 43-63% of biphenyl cyanide compound A, 5-10% of biphenyl alkyne compound B, 1-5% of ester compound C, 4-8% of compound D, 4-11% of compound F, 2-6% of compound E and 10-30% of compound G. The seven types of compounds with different properties are mixed to achieve the optimal properties of the liquid crystal material, so that the liquid crystal material has the advantages of high birefringence value, low viscosity, high dielectric anisotropy and wide application temperature range. When being used for preparing PDLC (polymer dispersed liquid crystal) films, the material can enhance the off-state scattering intensity and electric field response speed of the PDLC film, lower the drive voltage of the PDLC film and widen the application temperature range, so that the PDLC film is more energy-saving.

The invention discloses a Faraday rotator suitable for a high-power opto-isolator. The Faraday rotator comprises a thermal compensation crystal, a half-wave plate, an iron ring, a first magnetic rotation crystal, a second magnetic rotation crystal, a first magnet and a second magnet. The first magnetic rotation crystal, the thermal compensation crystal, the half-wave plate and the second magnetic rotation crystal are laid out in the forward sequence of a Z axis, the iron ring is connected to the outside of the thermal compensation crystal and the outside of the half-wave plate in a sleeved mode, the first magnet is connected to the outside of the first magnetic rotation crystal in a sleeved mode, and the second magnet is connected to the outside of the second magnetic rotation crystal in a sleeved mode. When used for the opto-isolator, the Faraday rotator enables the opto-isolator to meet the requirement for high power of hundreds of watts and improves isolation degrees by at least 3dB.

The invention relates to a borate birefringent crystal for ultraviolet and deep ultraviolet. The birefringent crystal has a chemical formula Ba2Mg (B3O6)2, belongs to trigonal system, and has a space group of R-3; and a equals to 0.70528 (3) nm, and C equals to 1.65520 (9) nm, and Z equals to 12. The barium magnesium borate birefringent crystal is an aniaxial negative crystal with ne less than no, has a transmission range of 177-3000 nm and birefringence between 0.077-0.229, and is easy for cutting, grinding, polishing and storage, stable in air, and hardly deliquesced. The barium magnesium borate birefringent crystal is subjected to a self-melt spontaneous crystallization method, a melt Czochralski method or a fluxing medium method for growth; the barium magnesium borate birefringent crystal has large birefringence (no-ne = 0.077-0.229), has important application to fields of optics and communication for the production of polarized beam splitting prism.

A high-birefringence photonic crystal optical fiber low in limit and loss comprises a fiber core and a cladding. The cladding is a peripheral area formed by identical-structure circular air holes uniformly distributed around the fiber core. The air holes are arranged in optical fiber background materials periodically, and every three adjacent air holes form a right triangle. The fiber core is formed by background materials arranged at the center and two small circular air holes, and the two small circular air holes are externally tangent to each other and are equal in diameter. By changing the structure of the fiber core, high birefringence can be introduced by adjusting the diameter of the two small circular air holes within a certain range, and meanwhile, the optical fiber has quite low limit loss and is smooth in chromatic dispersion within a certain wavelength range. The high-birefringence photonic crystal optical fiber (PCF) in the above structure is simple in structure, has the advantages of high birefringence, low limit loss and smooth chromatic dispersion, and can be used for manufacturing polarization maintaining optical fiber with proper chromatic dispersion or polarization characteristics, and relevant optical fiber devices.

A thermoplastic film having at least two thermoplastic resin layers laminated on each other, wherein at least the thermoplastic resin layer of the film surface and the thermoplastic resin layer of the film back each have a tilt structure in the thickness direction of the film, and in the plane including the tilt direction of the tilt structure and the film normal line, the sign of the angle, φ between the normal direction of the film surface and the tilt direction differs between the thermoplastic resin layer of the film surface and the thermoplastic resin layer of the film back, and wherein φ is from −90° to 90°.

A liquid crystal composition include a first compound (a) and a second compound (b), wherein the molecular structure formula of the first compound is represented as follows and the molecular structure formula of the second compound is represented as follows. The liquid crystal composition also includes a third compound (c) of which the molecular structure formula is represented as follows. The liquid crystal composition has high birefringence. The invention also relates to a liquid crystal lens including the liquid crystal composition.

A multilayer optical retardation compensation film having at least one positive C-plate and at least one negative C-plate is used in an LCD device. The multilayer film may have a substantially flat wavelength dispersion curve, or the multilayer film combined with other layers in the LCD device may have a substantially flat wavelength dispersion curve. Polymer films for the positive C-plate may be identified according to their absorbance maxima at certain wavelength ranges.

The invention relates to a manufacturing method of new nanometer materials, in particular to a manufacturing method of a high thermal conductivity artificial graphite film. The method comprises the steps that additive acid dianhydride, diamine compounds and organic polar solvent are polymerized in a reaction still to form a polyamide acid solution at certain temperature; the polyamide acid solution, imidize accelerant, a dehydrating agent, an end-capping reagent, a microwave heating material and a nanometer black liquor material are stirred in a stirred tank, are placed on a support to be in a film shape in a tape-casting mode and then are heated and dried in an oven, and polyimide films are obtained; the obtained polyimide films serve as raw materials, and are crossed, stacked, carbonized and graphitized, and finally the high thermal conductivity artificial graphite film is obtained. The manufacturing method is advanced in process, and the obtained graphite film has high thermal conductivity performance and good bending resistance.

The invention discloses a dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound and a preparation method thereof. The structural general formula of the dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound is shown in the specification, wherein (F)m, (F)n and (F)x respectively represent fluorine atom substitution, m, n and x represent substitution number of the fluorine atoms and the value of m, n and x is 0 or 1, and the cyclohexyl is trans-cyclohexyl; both R and R' represent C1-C15 alkyl, C1-C15 alkenyl, C1-C15 alkoxy, C1-C15 alkenyloxy, fluoro-substituted C1-C15 alkyl or fluoro-substituted C1-C15 alkenyl. The dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound not only has high clearing point, wide nematic phase section, large birefringence, and low optical absorption coefficient, but also has low melting point, low viscosity and good intermiscibility, and can be used in liquid crystal optical elements; the dicyclohexyl ethylene group substituted diphenylacetylene liquid crystal compound with side fluorine can also be used in a double frequency liquid crystal display mode.

The invention discloses a panda-liked high birefringence photonic crystal fiber. A pair of large air holes are respectively replaced with seven small air holes; and the transverse space among the cladding air holes is different from the horizontal space among the cladding air hole; therefore, the structural fiber has duplicate rotational symmetry; the orthogonally polarizing mode is no longer degenerated, which appears high birefringence. The panda like type of high birefringence photonic crystal fiber can maintain single mode transmission within a wide wavelength range; the birefringence of the mode is one order of magnitude higher than the birefringence of the common fiber at least. The structural fiber has low restriction consumption, large numerical aperture and adjustable dispersion. Therefore, the PCF with the structure can be used for the manufacture of the polarization maintaining fiber and the related fiber device, which are provided with suitable dispersion and polarization characteristics. The invention has very small temperature influence and good stability.

The invention belongs to the technical field of optoelectronic materials, and particularly relates to a terahertz polarization maintaining optical fiber and a manufacturing method of the terahertz polarization maintaining optical fiber. The terahertz polarization maintaining optical fiber is a medium / metal hollow optical fiber and is obtained by coating a metal film and a medium film on the inner wall of a base tube, the cross section of the terahertz polarization maintaining optical fiber is oval-shaped, and aperture size is determined according to the double refraction of a target and transmission loss, the ratio of an oval-shaped long shaft to an oval-shaped short shaft being 2:4, and the relationship between the double refraction and a normalization aperture. The optical fiber with the structure can obtain the double refraction in a 3*10<-2> mode and 2.4dB / m of absorption loss at 1THz (300mum).

Fiber structure including a core and a cladding, a central microstructure having a first plurality of longitudinal holes and which is adapted for guiding optical radiation and for birefringence in the core. Also included is a side microstructure having a second plurality of longitudinal holes is provided, wherein the side microstructure partly surrounds the central microstructure and provides a predetermined mechanical anisotropy, a pressure responsive unit for converting an isotropic pressure force to birefringence changes on the core, a lateral force responsive unit for converting a directional pressure force to birefringence changes on the core, a temperature responsive unit for converting temperature to birefringence changes on the core, and a birefringence responsive unit for converting birefringence in the core to wavelength information.

Optical compensation films (positive C-plate) with anisotropic subunits (OASUs) that are aromatic rings substituted with birefringence enhancing substituents (BES) and have high positive birefringence throughout the wavelength range 400 nm<λ<800 nm are provided. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Such optical compensation films are suitable for use as a positive C-plate in LCDs, particularly IPS-LCDs.

The invention discloses an elliptical cladding polarization-maintaining large-mode-area gain fiber, which, in the structure, comprises a fiber core of the elliptical cladding polarization-maintaining large-mode-area gain fiber, an inner cladding layer, an elliptical stress layer, a first outer cladding layer, a second cladding layer and a third cladding layer, wherein the inner cladding layer coats the fiber core; the elliptical stress layer coats the inner cladding layer, and the elliptical stress layer is elliptical on the cross section of the elliptical cladding polarization-maintaining large-mode-area gain fiber; the first cladding layer coats the elliptical stress layer; the second cladding layer coats the first cladding layer; and the third cladding layer coats the second cladding layer. As birefringence of the elliptical cladding polarization-maintaining fiber is directly proportional to ellipticity, deposition of a polarization-maintaining stress region only needs to be additionally added during a rod forming process, steps such as drilling are not needed, unavoidable impurities can be prevented from being introduced in a fiber pre-form rod, loss of the fiber after wire drawing can be reduced, strength of the fiber is improved, the entire forming process has simple steps, and the birefringence and pump absorption of the fiber can be improved.

The invention discloses a high-birefringence liquid crystal compound, a preparation method of the high-birefringence liquid crystal compound and a composition containing the high-birefringence liquid crystal compound. The liquid crystal compound has a structure general formula (I) shown in the description, wherein X1, X2 and X3 is H or F; R is one of straight-chain alkenyl with a carbon atom number being 2 to 5 or fluoro alkenyl with a carbon atom number being 2 to 5. The liquid crystal compound comprises less than or equal to 40 percent (not zero) of compounds shown as the general formula (I), 1 to 40 percent of compounds shown as a general formula (II), 1 to 30 percent of compounds shown as a general formula (III) and 2 to 50 percent of compounds shown as a general formula (IV), wherein the general formulas are shown in the description; R1, R2 and R3 are respectively one of alkyl with a carbon atom number being 1 to 7, alkoxyl with a carbon atom number being 1 to 7 or fluoroalkyl with a carbon atom number being 1 to 5; X4 to X9 are respectively -H or -F. The high-birefringence liquid crystal compound has the advantages of high birefringence and low rotary viscosity, and is applicable to the fields such as space light modulators, laser detectors and 3D (3-dimensional) displays.