Abstract: Provided are a two-photon-absorbing recording medium allowing recording and reproduction of a large volume of information, a two-photon-absorbing recording/reproducing method by using the same, and a two-photon-absorbing recording/reproducing apparatus.

Abstract: An organic electroluminescence device, includes: a pair of electrodes; and at least one organic layer including a light emitting layer, the light emitting layer being provided between the pair of electrodes, wherein at least one layer of the at least one organic layer contains a compound represented by formula (1) as defined in the specification.

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 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: (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 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: To provide a two-photon absorption dye-containing material having a great off-resonant two-photon absorption cross section and comprising a two-photon absorption dye capable of decoloring itself through off-resonant two-photon absorption, useful for a three-dimensional refractive index or absorption index modulation material, a three-dimensional optical recording medium, three-dimensional refractive index modulation method and recording and reproducing method for a three-dimensional optical recording medium a two-photon absorption dye-containing material comprising at least a two-photon absorption dye capable of decoloring itself through two-photon absorption.

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: A simultaneous two-photon absorption three-dimensional recording material includes at least one kind of dye having at least one polymerizable group.

Abstract: A process for preparing a platinum complex represented by the following formula (1) includes reacting a compound represented by the following formula (B-2) and a compound represented by the following formula (B-2?) with a compound represented by the following formula (A-0) to obtain a compound represented by the following formula (C-0); and reacting the compound represented by the formula (C-0) with a platinum salt:

Abstract: A non-resonant two-photon absorbing material is provided, comprising a methine dye undergoing a non-resonant two-photon absorption, in which the methine dye is preferably a cyanine dye, a merocyanine dye or an oxonol dye, and a non-resonant two-photon absorbing material is provided, comprising a non-resonant two-photon absorbing compound undergoing non-resonant two-photon absorption in the intermolecular aggregation state.

Abstract: A hologram recording material with high sensitivity, high diffraction efficiency, good storability, a small shrinkage ratio, dry processing applicability and a multiple recording performance, which is applicable to high density optical recording media and the like, is provided. The hologram recording material contains the specific acid generator of sensitizing dye.

Abstract: A holographic recording medium has at least a recording layer with a thickness of L which comprises a recording layer material having an absorption coefficient of ? and containing a photorefractive material, wherein the optical density ?L represented by the product of the absorption coefficient ? and the thickness L is in the range from 0.3 to 2.0.

Abstract: A hologram recording method is provided and includes: a first step of forming a latent image in a hologram recording material by holographic exposure; a second step of subjecting the hologram recording material having the latent image to heat treatment so as to form interference fringes providing a refractive index modulation; and a third step of irradiating the hologram recording material entirely with light to fix the interference fringes. A hologram recorded by the hologram recording method can be reproduced without erasing the refractive index modulation.

Abstract: A two-photon recording method is provided and includes: a first step of effecting two-photon absorption to form a latent image in a two-photon absorption recording material; a second step of subjecting the two-photon absorption recording material to heat treatment by which refractive index, absorptivity or luminescence intensity is modulated according to the latent image to effect recording; and a third step of irradiating the two-photon absorption recording material thus heat-treated with light on the entire surface thereof to fix the recording thus formed. The recording can be reproduced without being erased.

Abstract: A silver halide photographic light-sensitive material having high sensitivity and having a desired spectral sensitivity distribution. A silver halide photographic light-sensitive material comprising at least one multichromophore dye compound having at least two dye chromophores connected by covalent bonding or coordinate bonding, at least two of the dye chromophores forming a dye chromophore group and the light absorption of the dye chromophore group differing from the sum of individual light absorptions of respective dye chromophores constituting said dye chromophore group.

Abstract: A two-photon absorbing polymerizable composition contains at least a two-photon absorbing compound, a polymerization initiator and a polymerizable compound, the composition being photopolymerizable upon non-resonant two-photon absorption, wherein the two-photon absorbing compound is a methine dye containing a compound represented by the formula (1): wherein R1 to R5 each represents a hydrogen atom or a substituent and some of R1 to R4 may combine with each other to form a ring; n and m each independently represents an integer of 0 to 4, provided that n and m are not 0 at the same time; X1 and X2 each represents an aryl group, a heterocyclic group or a group represented by formula (2); R6 represents a hydrogen atom, an alkyl group, an alkenyl group, an aryl group or a heterocyclic group, and Z1 represents an atomic group for forming a 5- or 6-membered ring.

Abstract: A hologram recording material is provided and has at least a silver halide, an organic refractive index-modulating agent, and a binder is provided. The silver halide undergoes sensitization in accordance with interference fringes caused by holographic exposure, to thus form a latent image. Thereafter the silver halide is subjected to a development process to thus develop the thus-sensitized silver halide, thereby causing reaction of the organic refractive index-modulating agent. Hence, the interference fringes formed by refractive index modulation are recorded.

Abstract: A hologram recording material is provided and has: an optical refractive index-modulating component; and a curable polymer. The optical refractive index-modulating component performs at least one of: (1) a color development reaction; (2) a color development reaction amplified by a self-sensitization with a coloring material of a latent image; (3) a color development reaction amplified by a self-sensitization with a coloring material of a latent image; (4) an alignment change in a compound having a birefringence; (5) a dye discoloration reaction; and (6) a latent image-sensitized polymerization reaction sensitized by a latent image of a residual of a discolorable dye, to record interference fringes providing a refractive index modulation.

Abstract: A hologram recording material is provided and has: a sensitizing dye absorbing light upon hologram exposure to generate an excited state thereof, and an interference fringes-recording component capable of causing color development reaction or discoloration by an electron or energy transfer (movement) form the excited state to record interference fringes providing a refractive index modulation. At least one of the sensitizing dye one the interference fringes-recording component is one a polymer and an oligomer.