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EP1090391A4 - Disque optique photochrome multicouche de memorisation de donnees - Google Patents

Disque optique photochrome multicouche de memorisation de donnees

Info

Publication number
EP1090391A4
EP1090391A4 EP98960155A EP98960155A EP1090391A4 EP 1090391 A4 EP1090391 A4 EP 1090391A4 EP 98960155 A EP98960155 A EP 98960155A EP 98960155 A EP98960155 A EP 98960155A EP 1090391 A4 EP1090391 A4 EP 1090391A4
Authority
EP
European Patent Office
Prior art keywords
information
medium
photochromic
fluorescence
reading
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98960155A
Other languages
German (de)
English (en)
Other versions
EP1090391A1 (fr
Inventor
Nicolai I Koroteev
Sergei A Magnitskii
Sergei A Krikunov
Vladimir V Shubin
Dimitry A Malakhov
Eugene V Levich
Jacob N Malkin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OMD Devices LLC
Original Assignee
OMD Devices LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by OMD Devices LLC filed Critical OMD Devices LLC
Publication of EP1090391A1 publication Critical patent/EP1090391A1/fr
Publication of EP1090391A4 publication Critical patent/EP1090391A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
    • G11B7/245—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing a polymeric component
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00455—Recording involving reflectivity, absorption or colour changes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • G11B7/0052—Reproducing involving reflectivity, absorption or colour changes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0055—Erasing
    • G11B7/00552—Erasing involving colour change media
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/006—Overwriting
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously

Definitions

  • the present invention is directed to a method and system for use in optical data storage systems, such as three-dimensional (3D) optical memories, WORM (write-once, read-many) drives, and WER (write, erase, and read) drives, and is more particularly directed to such a method and system in which a single laser is used to write information on a multilayered disk or other medium.
  • 3D three-dimensional
  • WORM write-once, read-many
  • WER write, erase, and read
  • One known technique for optical data storage involves two-beam, two-photon writing and fluorescent reading in a 3D photochromic medium. That technique was developed mainly by Peter M. Rentzepis and persons working with him and is described, e.g., in U.S. Patents 5,268,862 and 5,325,324 and in the references by him and others listed below.
  • Information is recorded with two intersecting beams; a fundamental beam and a second harmonic of picosecond YAG:Nd laser radiation.
  • the characteristic pulse duration is about 30 picoseconds, and the pulse energy is several millijoules. That method allows page-by- page recording but demands significant modification of existing computer architecture.
  • Another known technique involves single-photon writing and phase contrast reading in multilayered photochromic matrices, photopolymers, and photoreffactive crystals. That technique was developed mainly by S. Kawata et al and is described, e.g., in the references by them listed below. That technique has the disadvantages of low spatial resolution and high energy cost.
  • the present invention is directed to a method and system for 2.5-dimensional (hereafter known as 2.5D) optical data storage with single-beam, two-photon writing and fluorescent reading from a photochromic medium.
  • the reading may be carried out either sequentially (bit-by-bit) or in parallel (page-by-page).
  • the organic photochromic molecules used in the medium have an initial form A and an excited or colored form B.
  • the molecules are embedded in polymer matrices and have good optical quality, thereby allowing high spatial resolution, limited only by molecular dimensions.
  • the present invention is thus directed to a variant of 3D optical data storage in which the medium is a multilayered photochromic structure such as a multilayered fluorescent disk.
  • the medium has photosensitive layers separated by inert (non-photoactive) polymer layers. That structure allows single-beam, two-photon, bit-by-bit writing whose locality is provided by the small thickness of the photoactive layers and the nonlinearity of the two-photon process.
  • the multilayered structure provides a 2.5-dimensional optical memory that can be made compatible with existing CD and DVD technology.
  • a single beam for recording rather than dual beams, allows the use of ultrashort light pulses, namely, of femtosecond order.
  • CW mode-locked femtosecond lasers capable of producing femtosecond pulses with a repetition rate of 10 MHz to 10 GHz are suitable for use in the present invention.
  • Readout can be performed by registration of the fluorescence caused by either single- or two-photon absorption. Single-photon absorption permits page-by-page reading of information.
  • Fig. 1 is a drawing showing a cross-sectional view of an optical information storage medium according to the preferred embodiment of the present invention
  • Figs. 2 A and 2B are graphs showing the dependencies of colored form accumulation on the product of pulse energy density and the effective cross section after the effect of several pulses and on the number of pulses;
  • Fig. 3 shows the dependence of the optimal number of laser pulses for writing one bit of information on the quantum yield of photocoloration and on the required relative form B accumulation;
  • Fig. 4 is a schematic diagram showing image formation from a multilayer fluorescent matrix during the readout process
  • Fig. 5 is a schematic diagram showing a constructed prototype of the present invention.
  • Fig. 6 is a schematic diagram showing a universal head in writing mode
  • Fig. 7 is a schematic diagram showing the universal head in reading mode
  • Fig. 8 shows the dependence of the absorption spectrum of a thin polymer film containing naphthacenepyrodine No. 10 on form B accumulation during the illumination of the medium by blue light;
  • Fig. 9 shows normalized fluorescence spectra of naphthacenepyrodone No. 10 in forms A and B;
  • Fig. 10 shows an image of a pit written by three dots positioned horizontally at distances of about one micrometer, in which the pit dimensions are 1.7 micrometers vertically and 3.7 micrometers horizontally;
  • Fig. 1 1 shows five fluorescent images obtained from five layers of the 2.5D optical medium, the images being recorded directly over one another, the thickness of the photosensitive layers being one micrometer, the layers being separated by distances of thirty micrometers.
  • the storage medium comprises transparent multilayer polymer photochromic matrices which are deposited onto the surface of flat substrates, for example, by a spin-coating method.
  • a cross section of a 2.5D matrix is depicted in Fig.1.
  • 2.5D matrix 101 includes a substrate 103 supporting alternating photosensitive layers 105 and
  • the photosensitive layers 105 can be about 1 ⁇ m thick, and the
  • the photosensitive layers 105 include
  • the separating layers 107 can be made from any transparent polymer or other material.
  • transparent means transparent to the wavelengths that will be used in reading and writing, as will be explained in detail below.
  • n B ( k ) n 0 l 1 l - (l - exp(-2 ⁇ j ⁇ 2 dt)) 0)
  • ⁇ 2 dt may be determined provided the pulse energy and the pulse temporal profile are
  • ⁇ is the pulse duration
  • I(t/ ⁇ ) is the profile of pulse intensity
  • g is form factor
  • n B ( k ) noi 1 - 1 - — (1 • exp(-2 ⁇ g X )) (3) 2
  • n A is the concentration of the initial photocromic substance form A;
  • ⁇ is the local photochromic substance
  • ⁇ is the two-photon cross section.
  • n ⁇ ( k ) n oi 1 1- ⁇ (1 -e ⁇ (-2 ⁇ eff E)) (4)
  • n B (l) n 0 -[l-exp(-2 ⁇ eff E)]. (5)
  • n B (k) n 0 ⁇ l-[l- ⁇ cff E] k ⁇ . (6)
  • equation (6) may be transformed to exponential form:
  • the characteristics of 3D optical memory device may be estimated. Let us assume that the average power of femtosecond laser radiation is equal to 15 mW, the pulse repetition rate is 1 GHz (see the disclosure by S.D. Yakubovich et al), the pulse duration is 100 fs, the two-photon cross section of photochromic molecules is 10 "47 cm 4 s (that is exactly the value for Rh-6G dye, that may be used for sensitization and 20 times smaller for dye AF-50), the quantum yield of the photoreaction and the form factor are close to 1, and
  • the writing beam diameter is 0.8 ⁇ m (in accordance with CD standard).
  • the 3D memory device with such parameters is able to write information with a speed as high as 1 Gbit/s.
  • the energy expense for writing of one bit of information is equal to 15 pj (see below).
  • lasers generating the pulses of 50-100 fs range are most suitable, i.e. one should use a Ti:sapphire laser, a C ⁇ LiSAF laser, an Er-doped fiber laser, a semiconductor laser system or a CPM dye laser.
  • a Ti:sapphire laser to develop the prototype of 3D optical data storage device.
  • the bit is considered to be recorded if minimal detectable form B concentration (nB/no)mm in the volume restrained by the diffraction limited laser beam focal spot is accumulated.
  • the required laser power P and pulse repetition rate f may be easily derived if the information recording rate is given from the known value of cast energy expenses for writing one bit of information obtained from (9) or estimated according to Fig. 3 :
  • d is the waist diameter of the focused laser beam and ⁇ is the radiation wavelength in
  • the essentials of writing optimization is in definition of the optimal number of laser pulses with given duration and temporal profile in which the writing energy ought to be split to minimize the total energy in whole pulses.
  • the record-read-erase processes are characterized by quantum yields of corresponding photochemical reactions. It is worth to note that the value of quantum yield may be varied in the process of photochemical reaction. In the case of polymer matrices the variation of differential quantum yield is caused by: 1) the reverse photochemical reaction; 2) the kinetic non-equivalence of molecules because of inhomogeneity of their interaction with polymer host; 3) the energy transfer between photoisomers in the case of high concentration of photochromic molecules and 4) the different rates of photoreactions along the film depth due to light absorption in the samples with high optical density.
  • Information reading in 2.5D optical memory devices may be performed by the registration of fluorescence excited at single- or two-photon absorption.
  • the single-photon reading allows the use of "page-by-page" (parallel) reading. In both cases the reading process is accompanied by the information erasing due to photobleaching of colored form of photochromic molecules.
  • Page-by-page reading may be provided by a CCD camera. If the reading beam is directed onto the specimen at the Brewster angle, one can avoid the interference with the reflected light.
  • n B (t) n B (0) exp(- ⁇ B ⁇ B ⁇ t) , (14)
  • n B (0) is the initial colored form concentration
  • ⁇ and ⁇ are the fluorescence
  • the total number of photons which can be emitted from 1 cm 3 is equal to
  • Every readout system possesses the inherent detection limit defined as the minimum number of photons emitted from unit volume during registration time necessary to detect the presence of colored information pit.
  • ⁇ F m j n be the minimal number of photons which can
  • the maximum number of reading cycles N max can be estimated for original concentration of form B as integer part of the following expression:
  • NA is the numeric aperture of reading objective.
  • the fluorescence image formation is depicted in Fig.4.
  • the symbols J-l, J, J+l denote the images of three consequent layers 105 of a multilayer matrix 101 formed at a CCD camera 401 having a target plane 403.
  • the images are formed by a microobjective 405. It is assumed that the distances between information layers are similar.
  • Light beams forming the pit image are located within the cone defined by the angular
  • Fig.4 the case of the focused image of layer J on the surface of the CCD camera 401 disposed at the target plane 403 is represented. Let us recall that all layers are illuminated simultaneously.
  • the image area S is limited by the circle that is the intersection of the cone ⁇ with a
  • Corresponding beams are represented by solid lines 407 in Fig.4. Besides that we shall mention that every pit deposited in the neighbor to reading layer illuminates an area similar to the area S in the plane of CCD camera target (in this case the beams are represented by dashed lines 409 in Fig.4).
  • the background of neighboring layer that is from the area that does not contains the colored
  • the required noise level depends on the method of pattern recognition. Let us assume that two-level coding of information is used and that information recording is provided in such manner that the pit localization at the surface of any layer is known. In this case the signal from every pit can be averaged over the total pixel number (n) on the CCD matrix corresponding to one pit of information. The sample size in this case is equal to n. Let us assume that the intensities of signal and phone are normally distributed values, that the mean values are ⁇ p and ⁇ 0 correspondingly and that the distribution dispersions of
  • the definition of phone level and its dispersion may be done over the large area and thus over the large number of CCD pixels. That is why the statistical assurance of the definition of these values is much better than the statistical assurance of the signal level definition because the last one is defined by the single information pit area. Besides that we assume high accuracy of signal level determination or the determination of its minimum value.
  • the influence of fluorescence of neighbor layers onto the readout signal contrast become smaller because the intensity of reading laser radiation is tightly focused into the selected informative layer.
  • An additional diminishment of the noise signal from neighbor informative layers may be carried out if two-photon excitation of fluorescence of photocromic molecules in colored form by femtosecond continuous train of laser pulses will be used.
  • Information erasing may be performed either by two-photon excited photobleaching to provide spatial localized erasing of the information in the chosen layer of data storage medium or by single-photon excited photobleaching if all information that was recorded into medium should be erased.
  • the first erasure variant is similar to the information recording and the second variant characterization is already made as the process that accompanies the readout of information.
  • the prototype of the described above 2.5D optical memory device that has been built is a table-top setup 501 of Fig. 5 having the following basic elements: lasers for recording, erasing and reading of information, optical modulators, universal module for writing and reading of images, precision 3D positioning stage with polymer photochromic matrix holder and controlling computer (is not depicted on the scheme).
  • the schematic of the setup is represented in Fig. 5.
  • This laser produces 100-fs pulses with an average power of 150 mW and a repetition rate of 100 MHz.
  • the argon-ion 5.6-W "Innova-316»"laser ("Coherent") 507 is used for pumping.
  • the matrix 505 is supported and moved in three dimensions by step drivers 515.
  • the setup 501 is completed by an electrooptic gate 517, an acoustooptic gate 519, and such mirrors 521 as are needed.
  • the scheme of a universal head in the recording regime is presented in Fig. 6.
  • the recording radiation after the electro-optical gate 517 is collimated by a lens system 601 into a beam filling the significant part of the microscopic objective 509's aperture and has an appropriate divergence to minimize objective aberrations.
  • Ti: sapphire laser radiation is reflected by a dichroic mirror 603 and directed into the microscopic objective 509.
  • the pulse energy of the recording radiation varies from 10 to 500 pj per pulse, while the maximum peak power density inside the photochromic layer reaches 100 GW/cm 2 .
  • exposure time used for recording a single dot lies in the range of 1-10000 ⁇ s corresponding to
  • the image of the chosen layer is focused on the matrix of the CCD camera 513 by the same microscopic objective 509 as is used for recording. Fluorescence is excited by the portion of argon-ion laser radiation at wavelength of 514 nm.
  • the schematic of the universal head in such a readout regime is represented in Fig. 7. The radiation is directed onto the specimen from an opposite side through the transparent quartz substrate 701 of the drivers 515 at the Brewster angle.
  • the universal head 511 is motionless and the choice of the selected layer is provided by 3D specimen displacement. This displacement is carried out with the help of the three step-motors or drivers 515 which drive the precision platen. The accuracy of spatial displacement is 0.22 ⁇ m along any coordinate.
  • Writing radiation is dosed by pulse train duration controlled by the electro-optical gate, while the readout time is controlled by the acousto-optical gate.
  • Specimen displacement, switching of the gates and operation of the CCD camera are computer-controlled.
  • the storage media specimens are the transparent multilayer polymer photochromic matrices which are deposited onto the surface of round (20 mm in diameter, 5mm thick) quartz substrates by spin-coating method.
  • the thickness of photosensitive layers is about 1
  • polymer films containing NP are transparent in the near IR spectral region. Thus it is easy to provide two-photon writing into any layer of a 2.5D optical matrix volume.
  • the form A and B absorption bands in visible spectral range are strongly separated (450 nm and 530 nm). Thus any of these forms may be excited selectively.
  • Fig. 9 Representative normalized fluorescence spectra of both NP No. 10 forms are depicted in Fig. 9. Although fluorescence spectra of two forms of NP No. 10 overlap, the significant difference in positions of the absorption bands of form A and form B and in their fluorescence quantum yields allows one to read the information correctly and efficiently.
  • transverse dimension of the pit is ⁇ 1.7 ⁇ m, while the longitudinal pit dimension is larger by
  • the dimension of written pit is to be less than the diameter of the writing beam waist due to the non-linearity of the two-photon writing process.
  • the observed enlargement of pit dimensions is not the principal limit of storage media but, in our opinion, is connected with the effects of writing process saturation.
  • the saturation level is strongly influenced by photodestruction, reverse photoreaction, light absorption by other levels of molecules, by photoreaction quantum yield change due to inhomogeneity of molecules embedded into polymer host, and so on. The majority of these effects are sufficient not only for the decrease of resolution but also for the rate and energy changes of the recording and the erasure of information. Moreover, these effects have influence on other significant characteristics of optical memory devices such as the achievable number of record-erase cycles.
  • the described setup can be used not only as a pilot prototype of 2.5D optical memory device based on two-photon recording and fluorescent reading of information but also as a photochromic materials tester.
  • the non-stationary single photon excitation by femtosecond laser pulses is also interesting and may be investigated with the help of this setup.
  • the designed setup provides writing, reading and erasing the information according to the principle: two-photon single beam "bit-by-bit” writing and fluorescent "page-by-page” single-photon reading 2.5 D femtosecond optical data storage. Reliable functioning of the 2.5D data storage prototype has been demonstrated via information writing into single-, two-, three- and five layer polymer photochromic naphthacenepyridone matrices.
  • NP polystyrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-sulfraredsorption, IR-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-
  • the preferred embodiment of the present invention thus incorporates the following features.
  • the photochromic material and appropriate femtosecond laser are selected to provide two-photon writing of the information.
  • the multilayer data storage medium can be made according to Fig.1, and the 2.5D optical data storage device in principle may be similar to the prototype schematics represented in Fig. 3.
  • Those skilled in the art who have reviewed the present disclosure should easily be able to develop the software for encoding the information, controlling the information recording, controlling the readout process performed with the help of CCD camera and for decoding the information.
  • the setup contains a computer-controlled 3D displacement precision stage with a data storage media holder, gates for the writing and reading laser beams, micro-objective to focus the writing beam and to transfer the page image during reading of the information onto a CCD camera.
  • Those skilled in the art can easily develop suitable software necessary to control the processes of recording, reading and erasing of information. While a preferred embodiment of the present invention has been set forth in detail above, those skilled in the art who have reviewed the present disclosure will readily appreciate that other embodiments can be realized within the scope of the present invention, such as the following.
  • WORM write once read many
  • a semi- reversible WORM drive may be based on coloration of spyropiranes conjugated with polymer molecules that are irreversibly colored by photochemical reaction while may be returned to initial form after heating. Therefore, the present invention should be construed as limited only by the appended claims.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Nanotechnology (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un support (101) de mémorisation optique de dimension 2 1/2 formé de couches multiples de molécules photochromes insérées dans une matrice polymère, ces couches étant séparées par de couches (107) de séparation transparentes. La position du support (101) est réglée en trois dimensions pour permettre une écriture d'information par faisceau unique à deux photons. L'information ainsi écrite peut être lue bit-à-bit ou page par page. Dans ce dernier cas une zone est illuminée et la fluorescence est détectée par une caméra à couplage de charge.
EP98960155A 1997-10-31 1998-11-02 Disque optique photochrome multicouche de memorisation de donnees Withdrawn EP1090391A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US6379797P 1997-10-31 1997-10-31
US63797 1997-10-31
PCT/US1998/023194 WO1999023650A1 (fr) 1997-10-31 1998-11-02 Disque optique photochrome multicouche de memorisation de donnees

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EP1090391A1 EP1090391A1 (fr) 2001-04-11
EP1090391A4 true EP1090391A4 (fr) 2001-04-11

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EP (1) EP1090391A4 (fr)
JP (1) JP2001522119A (fr)
AU (1) AU1582199A (fr)
WO (1) WO1999023650A1 (fr)

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US6632890B1 (en) 1999-03-19 2003-10-14 Dow Global Technologies Inc. Hydrogenated block copolymer compositions
ATE267217T1 (de) 1999-06-11 2004-06-15 Dow Global Technologies Inc Hydrogenierte block-copolymere und daraus hergestellte optische medienplatten
EP1196456B1 (fr) 1999-06-11 2006-06-28 Dow Global Technologies Inc. Copolymeres sequences hydrogenes et disques optiques produits avec ces copolymeres
JP2003507500A (ja) 1999-08-16 2003-02-25 ザ ダウ ケミカル カンパニー 水素添加ブロック共重合体および光媒体ディスク
IL134358A0 (en) * 2000-02-03 2001-04-30 C3D Inc Method and apparatus for reading of flourescent multilayer optical card
US6429260B1 (en) 2000-05-31 2002-08-06 The Dow Chemical Company Olefinic polymer compositions
AU2001270320A1 (en) * 2000-06-15 2001-12-24 3M Innovative Properties Company Multicolor imaging using multiphoton photochemical processes
EP1295180B1 (fr) 2000-06-15 2013-05-22 3M Innovative Properties Company Procedes de fabrication d'articles microfluidiques
EP1295179B1 (fr) 2000-06-15 2013-05-22 3M Innovative Properties Company Polymerisation multiphotonique permettant d'obtenir des elements optiques encapsules
EP1292852B1 (fr) 2000-06-15 2005-11-09 3M Innovative Properties Company Microfabrication d'elements optiques organiques
ATE440308T1 (de) 2000-06-15 2009-09-15 3M Innovative Properties Co Methode und gerät zur erzielung wiederholter multiphotonabsorption
US6852766B1 (en) 2000-06-15 2005-02-08 3M Innovative Properties Company Multiphoton photosensitization system
AU2002222458A1 (en) * 2000-12-07 2002-06-18 Consellation Trid Inc Method for polarization data recording/retrieval on luminescent optical data carriers
JP2004534849A (ja) * 2001-07-13 2004-11-18 トラスティーズ オブ ボストン カレッジ 光学的記録に有用なフタリド化合物
JP4079274B2 (ja) * 2002-07-16 2008-04-23 富士通株式会社 多層光記録媒体及び記憶装置
RU2248620C2 (ru) * 2002-11-26 2005-03-20 Общество с ограниченной ответственностью "Фототех" Оптический многослойный носитель информации, способ его изготовления, способ многослойной записи информации на данный носитель и способ считывания с него информации
WO2004104696A1 (fr) * 2003-05-26 2004-12-02 Matsushita Electric Industrial Co., Ltd. Support d'enregistrement d'informations, procede d'enregistrement et de regeneration utilisant ce support et appareil de regeneration d'enregistrement d'informations
CN1795417B (zh) 2003-05-28 2010-12-29 松下电器产业株式会社 信息记录媒体及其制造方法、以及记录再现方法、光学信息记录再现装置
US7436750B2 (en) * 2003-06-19 2008-10-14 Call/Recall Inc. Optical storage with ultra high storage capacity
US7771915B2 (en) 2003-06-27 2010-08-10 Fujifilm Corporation Two-photon absorbing optical recording material and two-photon absorbing optical recording and reproducing method
JP4411153B2 (ja) 2003-07-18 2010-02-10 富士フイルム株式会社 ２光子吸収色素消色材料、３次元的屈折率変調材料、３次元吸収率変調材料及び３次元光記録材料
JP4525345B2 (ja) * 2004-12-28 2010-08-18 ソニー株式会社 光記録方法及び光記録装置
WO2007014849A2 (fr) * 2005-07-28 2007-02-08 Ciba Specialty Chemicals Holding Inc. Stockage de donnees optiques
JP2007291330A (ja) * 2006-03-27 2007-11-08 Nara Institute Of Science & Technology ポルフィリン化合物、ポルフィリン化合物の製造方法、三次元光記録材料および三次元光記録媒体
FR2900762B1 (fr) 2006-05-05 2008-12-26 Centre Nat Rech Scient Memoires optiques, procede de lecture et d'ecriture de telles memoires optiques, et dispositif pour la lecture et l'ecriture de telles memoires
US7964333B1 (en) * 2006-06-09 2011-06-21 University Of Central Florida Research Foundation, Inc. FRET-based two photon three dimensional optical data storage
WO2008050340A1 (fr) * 2006-10-26 2008-05-02 Mempile Inc. Support d'enregistrement pour utilisation dans un support de données optiques tridimensionnelles, et procédé et système d'enregistrement/reproduction de données
JP5157284B2 (ja) 2007-06-28 2013-03-06 株式会社リコー 光増感型複合材料及び三次元メモリ材料と記録媒体、光制限材料と素子、光硬化材料と光造形システム、多光子蛍光顕微鏡用蛍光材料と装置
JP2010054623A (ja) 2008-08-26 2010-03-11 Ricoh Co Ltd 二光子吸収材料とその用途
JP2011014187A (ja) * 2009-06-30 2011-01-20 Fujifilm Corp 同時２光子吸収記録再生方法およびそれに用いる同時２光子吸収記録材料
FR2958778B1 (fr) 2010-04-07 2012-05-11 Centre Nat Rech Scient Support d'enregistrement reversible par stockage optique d'informations, procede d'enregistrement reversible sur un tel support.
KR102146842B1 (ko) 2011-06-09 2020-08-24 케이스 웨스턴 리저브 유니버시티 광학적 정보 스토리지 매체
CN114267380B (zh) * 2021-12-24 2024-02-02 华中科技大学 一种聚丙烯腈用作光存储介质的多维光存储方法
CN117423359B (zh) * 2023-10-30 2025-03-07 百代(上海)数据技术有限公司 存储系统、信息记录方法及三维存储器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4444988A1 (de) * 1994-12-16 1996-06-20 Wendt Ulrich Dr Rer Nat Habil Aufzeichnungsträger zur Speicherung optisch auslesbarer digitaler Informationen und Verfahren zu seiner Herstellung
WO1996038410A1 (fr) * 1995-06-02 1996-12-05 Forskningscenter Risø Nouveaux materiaux a fonctionnalites physiques
JPH0922034A (ja) * 1995-03-16 1997-01-21 Toshiba Corp 記録素子およびドリフト移動度変調素子
WO1997023463A1 (fr) * 1995-12-22 1997-07-03 Memory Devices, Inc. Materiau photochrome pour memoire electro-optique
WO1998025268A1 (fr) * 1996-12-05 1998-06-11 Omd Devices Llc Memoire optique fluorescente

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5325324A (en) * 1989-04-25 1994-06-28 Regents Of The University Of California Three-dimensional optical memory
US5268862A (en) * 1989-04-25 1993-12-07 The Regents Of The Unversity Of California Three-dimensional optical memory
JPH03144938A (ja) * 1989-10-30 1991-06-20 Sharp Corp 光メモリ素子
US5472759A (en) * 1993-12-16 1995-12-05 Martin Marietta Corporation Optical volume memory

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4444988A1 (de) * 1994-12-16 1996-06-20 Wendt Ulrich Dr Rer Nat Habil Aufzeichnungsträger zur Speicherung optisch auslesbarer digitaler Informationen und Verfahren zu seiner Herstellung
JPH0922034A (ja) * 1995-03-16 1997-01-21 Toshiba Corp 記録素子およびドリフト移動度変調素子
US5800950A (en) * 1995-03-16 1998-09-01 Kabushiki Kaisha Toshiba Recording medium
WO1996038410A1 (fr) * 1995-06-02 1996-12-05 Forskningscenter Risø Nouveaux materiaux a fonctionnalites physiques
WO1997023463A1 (fr) * 1995-12-22 1997-07-03 Memory Devices, Inc. Materiau photochrome pour memoire electro-optique
WO1998025268A1 (fr) * 1996-12-05 1998-06-11 Omd Devices Llc Memoire optique fluorescente

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9923650A1 *

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WO1999023650A1 (fr) 1999-05-14
WO1999023650A9 (fr) 1999-12-02

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