Abstract: Described are holographic storage mediums and method of making holographic storage mediums. The holographic storage mediums may have write components that bind to the matrix to form a pattern in the media. The holographic storage mediums may also be rewriteable.

Abstract: [Problems] The present invention provides a photosensitive composition capable of permanently forming a hologram having a low light scattering loss and high diffraction efficiency, and a forming method of a pattern. [Means for solving problems] A photosensitive composition used for forming a pattern by a pattern exposure containing (a) a polymerizable compound, (b) a photopolymerization initiator, and (c) organic-zirconia composite fine particles having a zirconia volume concentration of 20% by volume to 80% by volume; and a forming method of a pattern using the composition.

Abstract: We propose a method of detecting the presence of certain chemical and biochemical substances by virtue of the fact that they are, or have attached to them, either a dye molecule which acts as a photosensitizer for a holographic recording process, or another essential molecular component of the holographic recording material such as a monomer or a free radical generator. A recording material used in the process utilizes a photopolymer system consisting of a monomer and a crosslinking monomer, a free radical generator, a photosensitizer and, additionally, a polymeric binder when dry formulations are required and specifically lacks the substance to be detected. Subsequent holographic exposure records an interference pattern only where the complementary substance is present. Applications are broad ranging. Examples in diagnostics, printing, security, and environmental monitoring are given.

Abstract: An identification document having enhanced security and replication deterrence, while providing a simple low cost solution to other verification and authentication technologies. In one implementation, the document is provided with a multi-layer, multi-axis diffractive optical variable image device (DOVID) that is based on specific data or information on the document. The result is that the DOVID is directly tied to data or information that is specific to the document. This DOVID security feature is verifiable by the human eye so that no high levels of technology are necessary to verify authenticity. In addition, this DOVID security feature has enhanced tamper detection.

Abstract: The present invention relates to a method for the manufacture of a holographic film. The method includes a polymerizable composition that comprises monomers with high reactivity, monomers with low reactivity and a non-reactive material. The method comprises a patterned exposure to obtain a patterned polymerization of the monomers with high reactivity and a subsequent polymerization to polymerize also monomers with low reactivity to form a solid film. The method gives a holographic film with a high refractive index modulation and a modulated porosity.

Abstract: An optical recording medium is provided, which includes a recording layer includes a polymer matrix, a polymerizable compound, a photopolymerization initiator, and a polymerization inhibitor. The polymerization inhibitor is formed of a compound which exhibits a molar absorption coefficient of zero to a light having a first wavelength and generates an acid or a base when exposed to an external stimulus other than the light having the first wavelength, thereby inhibiting the polymerization of the polymerizable compound.

Abstract: A hologram substrate includes a hologram section arranged on a surface of the hologram substrate, the hologram section having an uneven pattern configured to form a holographic image, in which the uneven pattern is a depth-modulated pattern and has smooth boundaries between projections and depressions.

Abstract: The present invention relates to a homogeneous, photoactive film consisting of or comprising a polyelectrolyte carrying residues which may undergo a photoreaction, the polyelectrolyte mainly comprising at least one structure according to any of formulae (I) to (IV), namely [Pol(R*—P—R?)]oon+n/xAx? (I), n/xAx+[Pol(R*—P—R?)]oon? (II), [Pol(R1*-Q-R1?)]oon+n/x?x? (III), n/x?x+[Pol(R1*-Q-R1?)]oon? (IV), wherein Pol means a repeating unit of a linear or branched polymer chain, o indicates the number of the repeating unit of the polymer chain, and (R*—P—R?) and (R1*-Q-R1?) are n-fold positively or negatively charged side chains of the repeating unit Pol, wherein P is a group which is capable of photo-induced E/Z isomerization, Q is a group capable of participating in a photocycloaddition, or capable of participating in a photoinduced rearrangement, or the so called Photo-Fries reaction, A is a cation or anion which is oppositely charged, n is preferably 1 or 2, x is 1 or 2, and o is at least 2, with the proviso that

Abstract: To provide a hologram recording method capable of satisfying high sensitivity and at the same time, satisfying high diffraction efficiency, good preservability, low shrinkage percentage, dry processing and multiplex recording properties, a hologram recording method comprises a first step of producing a latent image upon holographic exposure, and a second step of causing a polymerization reaction due to the latent image, to form a interference fringe providing a refractive index modulation, wherein the first and second steps are dry process; particularly, the first step is a step of producing a colored material to form the latent image and the second step is a step of causing the polymerization reaction upon irradiating the colored material with a light having a wavelength different from that of the holographic exposure, to form the interference fringe providing the refractive index modulation.

Abstract: A holographic recording medium is provided, which includes a recording layer including a radically polymerizable monomer having an ethylenically unsaturated bond, a photo-acid generator, a photo-radical polymerization initiator, and a polymeric matrix. The polymeric matrix includes a repeating unit expressed by any one of the following chemical formulae.

Abstract: The present invention relates to a method for the production of polarization holograms, an apparatus for the production of polarization holograms and the use of the polarization holograms according to the invention as data stores, security features or diffractive optical elements for performing conventional optical functions.

Abstract: (1) A two-photon absorbing polymerization method comprising a first step of irradiating light absorbable by two-photon absorption to form a latent image and a second step of exciting the latent image to cause polymerization, and (2) A two-photon absorbing optical recording method comprising a first step of forming a latent image of a color-forming material by two-photon absorption, a second step of irradiating light on the latent image of a color-forming material to cause polymerization based on the linear absorption of the color-forming material, and thereby forming difference in the refractive index to perform a recording, are provided.

Abstract: A hologram-recording material, including a photoresponsive molecule, a reactive molecule having an intrinsic birefringence, and a photopolymerization initiator that accelerates polymerization and/or crosslinking of the reactive molecule having an intrinsic birefringence, a content of the photopolymerization initiator being in a range of less than about 0.1 wt % relative to the hologram-recording material, and, a content of the reactive molecule having an intrinsic birefringence being in a range of about 30 to about 80 wt % relative to the hologram-recording material.

Abstract: A white-light reconstruction hologram and a Fourier hologram for data can be recorded in a same holographic recording medium. The holographic recording medium includes, in a substantially identical plane, a white-light reconstruction holographic recording layer region capable of forming a white-light reconstruction hologram, having a thickness of 2 ?m to 80 ?m, and a Fourier holographic recording layer region capable of multiplexed hologram recording, having a thickness of 100 ?m to 2 cm.

Abstract: A two-photon absorption decolorizable material comprising: a two-photon absorption dye executing a two-photon absorption; and a decolorizable dye having a molar absorption coefficient equal to or less than 100 at a wavelength of a light irradiated at the two-photon absorption, wherein the decolorizable dye is decolorized by an electron transfer or an energy transfer utilizing an excitation energy obtained by the two-photon absorption of the two-photon absorption dye.

Abstract: The hologram recording sheet according to the invention is made up of a base film and hologram sensitive materials sensitive to different wavelength regions formed therein in a desired pattern, or a film and at least two hologram recording sensitive materials sensitive to different wavelength regions laminated on the film with a transparent plastic spacer layer located therebetween, thereby enabling the required diffraction light wavelengths to be recorded on the required sites without producing unnecessary interference fringes. At least two hologram recording sensitive materials sensitive to different wavelength regions are formed on different sites on a film in dotted or striped configuration, the size of which is up to 200 mm or at least twice as large as the thickness of the sensitive material layers, thereby enabling regions diffracting light of different wavelengths to be formed in the form of independent sets of interference fringes.

Abstract: This invention relates to improved methods of fabricating hologram systems, in particular holograms on a substrate such as a security document or bank note, to hologram systems fabricated by the described methods, and to starting materials for the methods. A method of preparing a hologram on a substrate, the method comprising: providing a hologram recording medium, the material comprising a carrier bearing a photosensitive hologram recording layer; recording a hologram in said photosensitive hologram recording layer; applying an adhesive to said hologram recording layer; attaching said carrier bearing said hologram recording layer to a substrate using said adhesive; and removing said carrier to leave said hologram recording layer attached to said substrate by said adhesive.

Abstract: A polymerizable media, including holographic recording media, and methods of use of the same. The media comprises at least one monomer or oligomer which undergoes polymerization to form a polymer; a compound, which absorbs actinic radiation of a first wavelength and forms a sensitizer which absorbs actinic radiation of a second wavelength; and an initiator, which, in combination with the sensitizer, initiates polymerization of the at least one monomer or oligomer when said sensitizer is exposed to actinic radiation of the second wavelength.

Abstract: The present invention provides an optical recording composition comprising at least one compound denoted by general formula (I) and a holographic recording medium comprising a recording layer, wherein the recording layer comprises at least one compound denoted by general formula (I). In general formula (I), each of A1 and A2 independently denotes —CR4R5—, —O—, —NR6—, —S—, or —C(?O)—, each of R4, R5, and R6 independently denotes a hydrogen atom or a substituent, R1 denotes a substituent, n denotes an integer ranging from 0 to 4, each of R2 and R3 independently denotes a substituent having a Hammett substituent constant, ?p value, of greater than 0, R2 and R3 do not form a ring structure by bonding together, and at least one from among R1, R2, R3, A1, and A2 comprises at least one polymerizable group.

Abstract: The present invention provides an optical recording composition comprising at least one optical recording compound selected from the group consisting of cyanine compounds having specific structures and a holographic recording medium comprising a recording layer, wherein the recording layer comprises at least one optical recording compound selected from the group consisting of cyanine compounds having specific structures.

Abstract: A hologram recording material is provided and includes at least a sensitizing dye capable of absorbing light having a hologram recording wavelength to generate an excited state thereof, and an interference fringe-recording component capable of recording interference fringes providing a refractive index modulation by an electron transfer or an energy transfer from the excited state, in which the sensitizing dye in the hologram recording material has a molar absorption coefficient within a range of 1 to 10,000 at the hologram recording wavelength.

Abstract: An optical device comprising a photorefractive composition configured to be photorefractive upon irradiation by a blue laser. The photorefractive composition comprises a polymer comprising a repeating unit including at least a moiety selected from the group consisting of the formulas (Ia), (Ib) and (Ic), as defined herein.

Abstract: The invention provides a hologram in which a visually unidentifiable microtext or other micropattern of the order of 10 ?m is recorded, and a process for the fabrication of the same. A volume hologram recording material 2 is located on the side of a reflection type volume hologram master 1 onto which copying illumination light 11 is incident, and the copying illumination light 11 incident onto the recording material 2 and light 12 diffracted through the master 1 interfere together in the volume hologram recording material 2 thereby copying the reflection type volume hologram master.

Abstract: A holographic recording medium is provided, which includes a recording layer containing a three-dimensional crosslinked polymer matrix, a photo-radical generating agent, and a ring-opening polymerizable compound having a radically ring-opening polymerizable alicyclic structure.

Abstract: Described herein are the materials, mechanisms and procedures for optimizing various performance parameters of HPDLC optical devices in order to meet differing performance requirements. These optimization tailoring techniques include control and independent optimization of switchable HPDLC optical devices to meet the demanding requirements of anticipated applications for, inter alia, the telecommunications and display industries. These techniques include optimization of diffraction efficiency, i.e., index modulation, polarization dependence control, haze, cosmetic quality, control of response and relaxation time, voltage driving for on and off switching, and material uniformity. This control and independent optimization tailors properties of switchable HPDLC optical devices according to the specific requirements of the application of the switchable HPDLC optical device.

Abstract: The present invention provides an image-formed object having security property improved, in which, even in the case where the image-formed object comprises a plurality of optical diffraction structures, the presence of each optical diffraction structure is hardly recognized. An image-formed object comprises a background region where an optical diffraction structure for background focusing a predetermined design as a hologram image at a predetermined image-formation distance, and at least one inset region provided so as to be inset in the background region, wherein, in the inset region, an optical diffraction structure for inset focusing a hologram image of the same design and color as the hologram image of the optical diffraction structure for background is formed at an image-formation distance different from the image-formation distance of the optical diffraction structure for background.

Abstract: The present invention provides a method for producing a homogeneous complex oxide sol comprising Si and a metal other than Si as metal elements, and a method for producing a Si-containing hologram recording material using a homogeneous complex oxide sol. A method for producing a complex oxide sol comprising Si and a metal other than Si as metal elements, the method comprising: mixing a silanol compound with an alkoxide compound of a metal other than Si so that the silanol compound is reacted with the alkoxide compound, thereby yielding a precursor of a complex oxide, and adding water to the complex oxide precursor so as to hydrolyze an alkoxyl group bonded to the metal other than Si, and then making the resulting hydrolysate undergo a condensation reaction, thereby forming a complex oxide. A hologram recording medium (11) having a hologram recording layer (21) comprising the hologram recording material obtained by the production method.

Abstract: High performance media suitable for recording with a blue laser is disclosed. The blue-sensitized holographic media provides greater dynamic range and higher sensitivity than previously disclosed blue-sensitized holographic media. These media can be used for diverse applications such as data storage where the articles provide denser data storage and more rapid hologram writing times or for optical waveguides where the articles provide greater optical confinement and more rapid manufacturing times.

Abstract: It is an object of the invention is to provide a hologram transfer sheet comprising: at least, a peelable layer; a relief formation layer having a relief; and a metal thin layer, which are sequentially formed on a substrate, capable of preventing a crack or discoloration of the metal thin layer which may be caused by heat or stress when a transfer layer is aligned with and transferred onto a transfer receiving body or preventing a disfigurement of the external appearance which may be caused by a crack mark of the metal thin layer following the thermal deformation of the substrate when performing an entire surface transfer by means of a heat roller. Such a hologram transfer sheet (1) comprising: at least, a peelable layer (3); a relief formation layer (4) having a relief; and a metal thin layer (5), which are sequentially formed on a substrate (2), is characterized in that the peelable layer (3) is made of a norbornene-based resin having a chemical structure containing a norbornene structure at least.

Abstract: A pigment layer intended more particularly for the permanent marking of glass, based on a polymer matrix which reacts predominantly with pulverization to a high-energy beam, more particularly to laser irradiation, and comprising at least one titanium compound and free carbon.

Abstract: The present invention provides a holographic recording composition comprising a compound denoted by general formula (I) and a holographic recording medium comprising a recording layer, wherein the recording layer comprises a compound denoted by general formula (I). In general formula (1), each of R1 and R2 independently denotes a hydrogen atom, alkyl group, aryl group, heterocyclic group, acyl group, or sulfonyl group, each of R3, R4, and R5 independently denotes a hydrogen atom, alkyl group, or aryl group, each of A and B independently denotes an electron-withdrawing substituent wherein A and B don't bond together to form a ring structure, and at least one of R1, R2, R4, R5, A, and B comprises a polymerizable group.

Abstract: The present invention provides a holographic recording composition comprising a compound denoted by general formula (I) and a holographic recording medium comprising a recording layer, wherein the recording layer comprises a compound denoted by general formula (I). In general formula (I), R1 denotes a hydrogen atom or a substituent having a Hammett value, ?p, of equal to or greater than ?0.30, each of R2, R3, R4, R5, and R6 independently denotes a hydrogen atom or a substituent, each of A and B independently denotes a substituent and a combination of A and B is (cyano group, cyano group), (oxycarbonyl group, oxycarbonyl group), (acyl group, acyl group), (sulfonyl group, sulfonyl group), (cyano group, acyl group), (cyano group, sulfonyl group), (oxycarbonyl group, acyl group), (oxycarbonyl group, sulfonyl group), or (sulfonyl group, acyl group), and at least one of R1, R2, R3, R4, R5, R6, A, and B comprises a polymerizable group.

Abstract: Described is a process for the production of a multi-layer body having a volume hologram with at least two different items of image information, wherein a photosensitive layer (46) of the multi-layer body is directly or with the interposition of a transparent optical medium (44s, 45) brought into contact with the front side of a master (44), in which interlaced regions with different asymmetrical surface structures or kinoform structures are shaped, which embody the at least two different items of image information. The photosensitive layer (46) and the master are exposed with a coherent light beam (47) whereby a volume hologram is formed in the photosensitive layer (46). Also described are a master for the production of the multi-layer body and a security element having said multi-layer body.

Abstract: A holographic grating is provided. The holographic grating includes a plurality of first structural areas including acrylic polymer with a first refractive index and a plurality of second structural areas including non-liquid crystal molecules with a second refractive index, wherein the first structural area is adjacent to the second structural area and the second refractive index is higher than the first refractive index. The invention also provides a method for fabricating the holographic grating.

Abstract: A photosensitive composition and A photosensitive medium for volume hologram recording comprises a photopolymerization reactive compound (a monomer) and any one of the following binder: (a) an organic-inorganic hybrid polymer obtainable by copolymerizing an organometallic compound of the formula 1 “R1m M1(OR2)n” and an ethylenic monomer and/or its hydrolyzed polycondensate; (b) an organic-inorganic hybrid polymer obtainable by copolymerizing an organometallic compound of the formula 3 “R4m Si(OR5)n” and an ethylenic monomer and/or its hydrolyzed polycondensate; and (c) a binder resin bonded to a metal or a combination use of a binder resin containing a hydroxyl group and/or carboxyl group and a metal chelate compound.

Abstract: The present invention provides an optical recording composition comprising a compound denoted by general formula (I) and a holographic recording medium comprising a recording layer, wherein the recording layer comprises a compound denoted by general formula (I). In general formula (I), R1 denotes a hydrogen atom or an alkyl group, and Z1 denotes an atom group, the atom group forming a ring structure with a sulfur atom and a carbon atom which are adjacent to the atom group, and a carbon atom bonded to the sulfur atom.

Abstract: The present invention provides an optical recording composition comprising a compound denoted by general formula (I) and a holographic recording medium comprising a recording layer, wherein the recording layer comprises a compound denoted by general formula (I). In general formula (I), each of R1, R2, and R3 independently denotes an alkyl group, aryl group, or heterocyclic group, X denotes an oxygen atom or sulfur atom, and n denotes 0 or 1.

Abstract: A multilayer holographic film includes a first layer and an embossed layer on at least one side of the first layer and having a micro-embossed holographic image therein. The embossed layer is thinner than the first layer and has a lower embossing temperature than the first layer. The hologram-receiving layer with a micro-embossed holographic image embossed therein is adapted to receive a metal layer thereon, if desired, and the layer includes a cycloolefin copolymer as the primary polymer component.

Abstract: Disclosed is a volume phase hologram recording material characterized by excellent photosensitivity, low cure shrinkage, high transparency, and particularly good storage stability and also disclosed is a recording medium prepared therefrom. Further disclosed is a photosensitive resin composition for volume phase hologram recording that comprises a soluble aromatic copolymer (A), a photoradically polymerizable compound (B) capable of copolymerizing with the soluble aromatic copolymer (A), a photopolymerization initiator (C), and a polymer binder (D). The soluble aromatic copolymer (A) has a structural unit of a divinyl aromatic compound and a structural unit of a monovinyl aromatic compound, comprises 10 to 90 mol % of a structural unit represented by the following formula (a1), has a hydroxyl equivalent of 100 to 30,000 g/equiv, a number average molecular weight (Mn) of 400 to 30,000, and a molecular weight distribution (Mw/Mn) of 10 or less, and accounts for 5 to 60 wt % of the composition.

Abstract: A hard-material object comprising a visional color-varying surface comprises a hard-material carrier and a pattern disposed on the surface of the hard-material carrier. The pattern comprises a plurality of multi-color pellets to compose a picture. Each of the multi-color pellets comprises the distinct coloring regions distinguishable by the eyes so that a viewer can obtain different color-varying visional feeling from the pattern when the hard-material carrier is resting and looked at from different view angles.

Abstract: The present invention provides a method for storing holographic data comprising providing an optically transparent substrate comprising a photochemically active dye and a photo-acid generator; irradiating the optically transparent substrate with a holographic interference pattern, wherein the pattern has a first wavelength and an intensity both sufficient to convert, within a volume element of the substrate, at least some of the photochemically active dye into a photo-product, producing within the irradiated volume element concentration variations of the photo-product corresponding to the holographic interference pattern, thereby producing a first optically readable datum corresponding to the volume element; and irradiating the optically transparent substrate at a second wavelength and intensity sufficient to activate the photo-acid generator to stabilize the optically readable datum.

Abstract: The present invention provides a holographic recording medium comprising: an optical recording layer, which optical recording layer includes one of a polymer compound having photoisomerizable groups in the side chain thereof and a polymer compound in which photoisomerizable molecules are dispersed therein, which recording layer records a hologram by having optical anisotropy induced by irradiation with a writing light having a predetermined wavelength thereon; and an optical filter layer formed on at least one side of the optical recording layer, which optical filter layer allows transmission of the writing light and a reading light having a predetermined wavelength irradiated on the optical recording layer, for reproducing the hologram recorded on the optical recording layer, therethrough and blocks light having a shorter wavelength than the wavelength of the writing light.

Abstract: An optical security feature, e.g. for a banknote or other security documents, comprises a first and a second holographic layer arranged on top of each other. Each layer comprises a comparatively simple reflective volume hologram, such as it can e.g. be recorded by the interference pattern of two Gaussian light beams. The volume holograms have different grating spacing and/or orientation as well as different extension such that the observer can distinguish and verify them easily. The simple nature of the holograms make the security feature easy to manufacture, while its two-layer structure makes it hard to copy and yields high diffraction efficiency.

Abstract: Described are holographic storage mediums and method of making holographic storage mediums. The holographic storage mediums may have write components that bind to the matrix to form a pattern in the media. The holographic storage mediums may also be rewriteable.

Abstract: It is a main object of the present invention to provide a volume hologram layer with good foil cutting property which is used for a volume hologram transfer foil and the like. The present invention provides a volume hologram layer wherein when the layer thickness thereof is 20 ?m, breaking strength is in a range from 10 MPa to 30 MPa and breaking strain is in a range from 0.1% to 3% at 25° C., and breaking strength is in a range from 0.1 MPa to 1 MPa and breaking strain is in a range from 0.1% to 5% at 130° C., to thereby solve the above problem.

Abstract: A sensor for the detection of an analyte, comprising a holographic element comprising a medium and a hologram disposed throughout the volume of the medium, wherein an optical characteristic of the hologram changes as a result of a variation of a physical property occurring throughout the volume of the medium, wherein the medium is obtainable by formation in situ in the presence of a pore-forming agent, wherein the agent is not present in the sensor or does not react with the analyte and the sensor.

Abstract: The present invention provides a hologram recording material and a hologram recording medium, suitable for volume hologram recording, that are excellent in multiple recording characteristics and stability over time in holographic memory recording using a blue laser as well as a green laser. A hologram recording material comprising at least metal compound fine particles and a photopolymerizable compound, wherein the metal compound fine particles comprise organometallic fine particles which contain a metal atom, an organic group, and an oxygen atom, have a direct bond between the metal atom and a carbon atom in the organic group (a metal-carbon bond), and have a bond between the metal atoms through the oxygen atom (a metal-oxygen-metal bond); and the metal compound fine particles are not crosslinked with each other. A hologram recording medium (11) having the hologram recording material layer (21).

Abstract: The present invention provides a hologram recording medium wherein, in holographic memory recording using a blue laser as well as a green laser, a fall in light transmittance is very small even after recording. A hologram recording medium comprising at least a hologram recording material layer, wherein the hologram recording material layer (21) comprises at least fine particles of a metal compound, and a photopolymerizable compound; and the recording sensitivity of said recording medium (11) to a laser light having a wavelength of 405±5 nm is 0.05 cm/mJ or more and 1.20 cm/mJ or less.

Abstract: It is an object of the present invention to provide a photopolymer-based volume phase hologram recording material that can record/reproduce image information with excellent properties in terms of bit error rate (BER) or signal to noise ratio (SNR), which expresses the ratio of digital signal to noise, and that is suitable for application to holographic information recording, etc., and to provide a volume phase hologram recorded material employing the material. In accordance with the present invention, it is possible to record/reproduce a volume phase hologram with reduced noise, etc. in data hologram recording by a produced polymer that has been polymerized by means of interference fringes generated by interference between information light and reference light, the produced polymer having a weight-average molecular weight of 1,000 to 3,000,000.

Abstract: A hologram color filter diffraction-separates an incident lightwave using a hologram to project thus separated lightwaves having different-wavelengths at intended positions with a specified spatial period. The hologram color filter comprises a light-transmitting substrate (21) and a light-transmitting diamond-like-carbon (DLC) film (22) formed on the substrate. In the DLC film, a relatively-low-refractive-index belt-shaped region (n1, 22a) and a relatively-high-refractive-index belt-shaped region (n2, 22b) are placed alternately.