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/xΛx− (III), n/xΛx+[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 in one polyelectrolyte, groups [R—P—R′] and/or [R1-Q-R1′] all have the same sign. The invention is further directed to the preparation of the film, its use and a method for the preparation of a replica of a film of the invention having a surface relief structure.
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:
There is provided a filter for an optical recording medium, including: a plurality of high refractive index layers, and a plurality of low refractive index layers, wherein the high refractive index layers and the low refractive index layers are alternately deposited, the total number of the high refractive index layers and the low refractive index layers deposited is an even number in the range of 10 to 20, and the high refractive index layers and the low refractive index layers are different in thickness from one another. Also, there is provided an optical recording medium using the filter for an optical recording medium.
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. Furthermore, when a hologram is recorded using information light and reference light, the present invention provides a volume phase hologram recording material that comprises a chain transfer agent.
Abstract:
The present invention provides a filter for optical recording medium capable of preventing diffuse reflection of an information beam and a reference beam from a reflective layer in the optical recording medium and preventing occurrence of noise without causing shift in selective reflection wavelength, and distortion in a reproduced image even when an angle of incidence is changed, and an optical recording medium capable of recording a high density image by using the filter. Specifically, the present invention relates to the optical recording medium containing a first substrate, a recording layer which records information by utilizing holography, an optical compensation layer, a filter layer, and a second substrate, in this order, and the filter layer is a cholesteric liquid crystal layer.
Abstract:
The present invention provides an optical information recording medium comprising a substrate having provided thereon a recording layer in which information can be recorded by laser light irradiation, wherein the recording layer contains a dye represented by the following formula (I): wherein Dye represents a dye residue having a molar extinction coefficient of 10000 (cm−1·mol−1) or more for light having a wavelength of 450 nm to 900 nm; L represents a divalent connecting group or a single bond; UV represents a dye residue having a molar extinction coefficient of 10000 (cm−1·mol−1) or more for light having a wavelength of 280 nm to 450 nm; and m denotes an integer from 1 to 8.
Abstract:
An apparatus according to the present invention includes a write compensation section, which generates a write signal to write information on an information storage medium, and a writing section for irradiating the information storage medium with a pulsed beam based on the write signal generated by the write compensation section. The information storage medium includes a recording layer, which has an optical constant that changes continuously with the total quantity of light received. The writing section radiates and condenses multiple pulsed beams on the recording layer at an interval that is shorter than the diameter of the pulsed beams on the recording layer. The write compensation section generates the write signal such that the each sum of variations in the optical constant at each irradiated spot of the pulsed beam on the recording layer through the end of a write operation forms a predetermined variation pattern.
Abstract:
There is provided a hologram recording method, including generating a signal light which is spatially modulated such that digital data is represented by an image of intensity distribution, irradiating the signal light on an optical recording medium after a Fourier transformation of the signal light such that a zero-order component of the signal light comes into focus at a point removed from the optical recording medium, forming a diffraction grating in the optical recording medium by interference between the zero-order component of the signal light and a high-order component thereof, and recording digital data represented by the signal light as a hologram.
Abstract:
A method for multiphoton-ionizing an organic molecule supported by a solid carrier according to the present invention is a method characterized in that the carrier supporting an organic molecule is irradiated with a laser light having a pulse width of less than 1 nanosecond. As a laser having a pulse width of less than 1 nanosecond, such femtosecond lasers as titanium-sapphire lasers, fiber lasers and ytterbium-tungsten lasers are desirable.
Abstract:
In an optical recording medium having two recording layers of a first recording layer and a second recording layer, the second recording layer contains metallized azo dyes represented by the following general formula (I) or (II), and recording characteristics of the second recording layer are improved by having optical density of 1.3 times as large as, or 1.3 times greater than, that of a dye contained in the first recording layer. (In this regard, rings A1 and A2 are nitrogen-containing heteroaromatic rings, rings B1 and B2 are aromatic rings, and X is alkyl group substituted by at least two fluorine atoms).