CN1176458C - Optical storing and reading method for high density information storage medium - Google Patents
Optical storing and reading method for high density information storage medium Download PDFInfo
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- CN1176458C CN1176458C CNB01118809XA CN01118809A CN1176458C CN 1176458 C CN1176458 C CN 1176458C CN B01118809X A CNB01118809X A CN B01118809XA CN 01118809 A CN01118809 A CN 01118809A CN 1176458 C CN1176458 C CN 1176458C
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Abstract
The present invention provides an optical storing and reading method for high density information storage media, which has the technical scheme that data is recorded and read by a dual-wavelength method; light with a wavelength is used as information recording light which is performed on a recording medium after focusing; a photochemical reaction is generated from a light illuminating area; the performance of the structure, the color, etc., of the light illuminating area is changed; the light with the other wavelength is used as information reading light, and the focused reading light is irradiated on the recording medium; the recorded information is identified by the difference of scattered light signals generated from the structure change caused by that whether optical radiation of each area is recorded.
Description
Technical field
The invention belongs to and a kind of optical information storage medium is deposited the method that write and read goes out, relate in particular to a kind of ultrahigh density that is used for and deposit the pure optical storing and reading method of the twin-beam of reading medium.
Background technology
At present, the most ripe, the most generally and to become commercial optical storage techniques be optical disc storage, is subjected to people's attention but the storing and reading method of ultrahigh density is the same with high density information storage medium, and still in continuous research.
CD mainly is a thermal effect of utilizing laser to the storage of information, promptly utilizes laser focusing to produce physics and chemical change writing information at the microcell of medium.CD is divided by its function and is mainly contained four kinds: compact disc-read only memory, CD-WORM, erasable optical disk and direct re-write optical disk.And the recording mode of CD has many kinds, mainly contain inversion of phases, ablative-type protective coating, play alveolitoid, fusion, alloy-type or the like, when carrying out the heat pattern record with media such as magnet-optical medium or phase transformations, its shape became irregular when measuring point was very little, this is because on when record medium due to the irregular thermal diffusion, so these media people resolution has the upper limit, the track pitch of general CD is 1 micron, is difficult to satisfy the requirement of Ultrahigh-Density Data Storage.In addition, the present photopolymer of developmental research, light such as sells off at recording materials, they all are to utilize light, heat, chemical reaction etc. that the regional structure of medium is changed, thereby refractive index changes thereby can be used as recording materials, except this recording mode be can not rewrite, its record upper limit also is subjected to the restriction of light, heat, chemical reaction, has also limited the further application in its future to a certain extent.
Transition metal oxide is as V
2O
5, WO
3, MoO
3, Nb
2O
5Photochromic and the electrochromism phenomenon of film can be widely used in aspects such as high density storage, image demonstration, laser printing, and its preparation method mainly contains vacuum vapour deposition, electrowinning method and spin-coating method etc. at present.The transition metal oxide film of these methods preparation is an impalpable structure, does not have long-range order, and its recording rule measurement level only limits to more than the micron, thereby has limited it and be applied to high density information storage medium.Simultaneously, a material (hole, proton) diffusion process is arranged in the photochromic process of transition metal oxide film, thereby limited the painted-colour killing cycle index of photochromic response speed and material, its application is restricted.
Chinese patent publication number 98111779.1 discloses a kind of ultrahigh density that can be used for and has deposited inorganic-organic compound off-color material of reading medium, utilize supermolecule effects such as electrostatic attraction, hydrogen bond that mineral compound and organic compound are combined with each other and form a new supermolecule, the further self-organization of this supermolecule forms the superlattice structure of long-range order.After transition metal oxide and the organic compound (for example organic amine, acid amides etc.) that proton source can be provided were compound, wherein transition metal oxide reached the orderly arrangement of nanometer scale in superlattice two dimension quantum face structure.Simultaneously, organic compound can have been eliminated the adverse effect of above material (hole, proton) diffusion process directly for transition metal oxide provides proton source, has formed the photochromic process of quick response reversible in the supermolecule.The different carbon chain lengths of organic compound, different molecular structures, different head bases have determined the bonding state of organic compound/mineral compound, the arrangement of inorganic molecule and the size of interlamellar spacing, thereby can both regulate and control composition, structure and even the performance of laminated film.Simultaneously, since in the laminated film organic component can be have do not share the same light, the organic molecule of electricity, magnetic and chemical isoreactivity, thereby structure, composition and the photoelectricity color shifting properties of supramolecular complex system produced modulating action, this modulation can improve the long-range order of material, photochromic response speed, increases the stability and the anti-fatigue ability of material.
The outstanding advantage of this compound substance is that the precursor liquid reaction by inorganic metal acid ion and organic molecule forms, wherein the inorganic acid radical ion is induced down in the supermolecule template action of organic molecule, acidified hydrolysis-condensation reaction obtains the inorganic-organic composite material of arranging in order on the nanometer level.For this kind compound substance, photochemical reaction takes place in the zone that only is subjected to illumination, and the minimal reaction zone can be less than tens molecules, even the area of several molecule.The long-range order of recording medium microstructure has guaranteed that the more information capacity is arranged on the unit area, information point minimum area restriction (1/ λ that can reach present optical information recorder fully theoretically, reads
2), even can reach a molecule the zone (＜1 square nanometers=, and the area that an information unit of present commercial CD takies be 1,000 times of this area to more than 10,000 times, thereby this kind compound substance is specially adapted to the medium of Ultrahigh-Density Data Storage.
In addition, (mainly be transition metal oxide film, with traditional inorganic photochromic material as MoO
3, WO
3Deng) compare, the compound substance that is used for recording medium has photochromic reaction and responds fast, prepare easy, advantage such as easy operating and more wide application prospect is arranged.The quick response of its photochromic reaction, also is suitable for the fast recording of high density canned data and reads fast by fast two more than the order of magnitude than traditional inorganic photochromic material; And compound photochromic material preparation is easy, and advantages such as easy operating provide good material base for using the future of this type of material.
Along with improving constantly that information storage density is required, press for the new ultrahigh density storage technology that further develops.Research to the optical information memory technology at present mainly concentrates on the following aspects:
1) holographic data storage technology mainly uses lithium columbate crystal to be storage medium;
2) near field optic scans micro-nanometer memory technology, and methods such as solid immersion lens, ultra-resolution near-field structure type and micro-aperture laser are arranged;
3) multidimensional optical storage technology comprises the two-photon absorption technology, the main materials such as organic polymer with big two photon absorption cross section that utilize.
To the compound substance that is used for recording medium of above-mentioned patent disclosure, with MoO
3/ cetylamine composite photochromic film is an example, adopt present storage and reading method, then the difference of its absorbance before and after illumination is 0.15 unit, this thickness is 1 micron, detecting the light path sectional area is 1 square centimeter, and signal intensity ratio is 1: 1.5, if consider the small area of measuring point, such as less than 1 square micron, the absorbance difference before and after the light color will be difficult to differentiate.No matter present commercial CD is magnet-optical medium CD, phase change medium CD or other recording medium CD, the problem that a signal to noise ratio (S/N ratio) is all arranged, thereby realize that with the direction of magnetization of utilizing Kerr magnetooptical effect to detect microcell magnetic domain on the CD magneto-optical CD of reading of information is an example, the signal to noise ratio (S/N ratio) of CD is relevant closely with the size at Ke Er angle, general Ke Er angle has only the several years at zero point, realize the information stores of super-high density, will obtain higher or available signal to noise ratio (S/N ratio), and promptly will have enough microcell magnetic domain areas to guarantee bigger Ke Er angle.Because the Ke Er angle of general magnet-optical medium is less, limiting minimum recordable area can not be too little, thereby the information density of magneto-optical CD can not be too high.
Summary of the invention
Purpose of the present invention promptly is to provide a kind of optical storing and reading method that is used for high density information storage medium, this method signal contrast is big, area of detection only is 1 micron, be applicable to reading of ultrahigh density storage information, and solved the problem that magneto-optic, light such as sell off at the record data changeableness of recording medium, but not damaged sense data.
The objective of the invention is to realize by the following method:
Light with two bundle different wave lengths carry out the record of data respectively and read, and a kind of light of wavelength is the information recording light, and the information recording light of focusing acts on and makes the light area that photochemical reaction takes place on the recording medium, and performances such as structure, color change; The light of another kind of wavelength is that information is read light, the information that focuses on is read light irradiation and scattering successively in order continuously on recording medium, in the recording medium because the structural change that causes of recording light causes the scattered light intensity notable difference of measuring point and non-measuring point, according to the information of the identification playback record of its difference.
Information recording light of the present invention is ultraviolet or black light, and used wavelength is less than 400 nanometers.
It is visible light or near infrared light that information of the present invention is read light, and used wavelength is greater than 500 nanometers.
Specifically, when the present invention adopts a kind of light of wavelength to come record data for the information recording light, it makes recording medium glossiness-giving effect zone (being measuring point) that the local photochemical reaction take place, the structure and the performance of the point of record all change, with light area not evident difference is arranged, thereby can recording data information; With another wavelength light that is different from information recording light wavelength is that information is read light, when the information of carrying out is read, make and read light irradiation successively in order continuously on medium recording point, and accepted analysis with detection system by the light signal that medium scatters, because measuring point is different with the structure and the performance of peripheral region, the light signal that is scattered by medium has just produced significant difference, tell its difference with detecting device, can carry out the identification of data, reach the purpose that data are read, because information is read light and can not be produced photochemical reaction to recording medium, thereby can the not damaged sense data.
Description of drawings
For the present invention there being further understanding, also elaborate in conjunction with the accompanying drawings below by embodiment, wherein:
Fig. 1 is a principle of the invention synoptic diagram;
Fig. 2 be in the embodiment of the invention 1,2,4 and 5 recording mediums not the scattered light intensity of illumination point and illumination point to the graph of a relation of scattered light frequency;
Fig. 3 be in the embodiment of the invention 3 recording mediums not the scattered light intensity of illumination point and illumination point to the graph of a relation of scattered light frequency.
Embodiment
Embodiment 1: please referring to Fig. 1, recording medium (3) is molybdenum trioxide/octadecylamine laminated film, with the 500W high-pressure sodium lamp of band optical filter (＜350 nanometer) is that spot after information recording light (1) line focus mirror (2) focuses on drops on molybdenum trioxide/octadecylamine laminated film (3), spot diameter is 1 micron, light intensity is 0.1 milliwatt, light application time is 1 second, goes up the darkviolet measuring point (4) that forms 1 micron of diameter at molybdenum trioxide/octadecylamine laminated film (3), but this darkviolet spot long preservation; After optical recording is finished, with the Ar+ laser instrument is that information is read the light (not shown), laser instrument is exported after the 514.5 nanometer laser line focuses respectively in light area and light area not, light intensity is 0.2 milliwatt, the LASER SPECKLE face is 1 square micron, its scattered light line focus lens (5) by optical splitter (6) monochromatization after (resolution is 0.5 wave number) detect with charge-coupled image sensor array detector (7).Scattered light intensity to the mapping of scattered light frequency, is obtained two remarkable different curves (as shown in Figure 2).The scattered signal strength ratio in zone is in 1: 6 (24: 151) being 795 wave number places before and after the illumination, and signal contrast is big.Presentation of results the method is applicable to the storage of high density information and reads.
Embodiment 2: the double frequency pulse laser (265 sodium rice) with neodymium doped yttrium aluminum pomegranate laser instrument is the information recording light, 1 micron of spot diameter, and light intensity is the burnt every pulse of 1 milli, and the illumination number of times is 10 subpulses, and the formation diameter is 1 micron a darkviolet measuring point.All the other read condition with embodiment 1, and scattered light intensity to scattered light frequency mapping, is obtained two curves identical as embodiment 1.
Embodiment 3: recording medium is molybdenum trioxide/ethylenediamine laminated film, the pulse laser of nitrogen molecular laser (337 nanometer) is the information recording light, spot diameter is 1 micron, light intensity is the burnt every pulse of 1 milli, the illumination number of times is 10 pulses, the formation diameter is 1 micron a mazarine spot, but this mazarine spot long preservation.After the optical recording process is finished, read light with 546 nanometer light of mercury vapor lamp as information, light intensity is 0.1 milliwatt, and focusing on back hot spot point area is 1 square micron, and its scattered light (resolution is 1.0 wave numbers) after the colour annalyzer monochromatization detects with photomultiplier.Scattered light intensity to the mapping of scattered light frequency, is obtained two remarkable different curves as shown in Figure 3, and the scattered signal strength ratio in zone is 1: 7.9 (194: 1529) at 893 wave number places to the maximum before and after the illumination, and signal contrast is big.
Embodiment 4: recording medium is molybdenum trioxide/cetylamine laminated film, and information recording light and information are read optical condition with embodiment 1, and the scattered signal strength ratio in zone, illumination front and back is 1: 3 of 750 wave number places to the maximum, and signal contrast is big.
Embodiment 5: recording medium is molybdenum trioxide/lauryl amine laminated film, and information recording light and information are read optical condition with embodiment 1, and the scattered signal strength ratio in zone, illumination front and back is 1: 6 of 870 wave number places to the maximum, and signal contrast is big.
Claims (4)
1, a kind of optical storing and reading method that is used for high density information storage medium, it is characterized in that, light with a kind of wavelength is the information recording light, act on and make the light area that photochemical reaction takes place on the organic/inorganic composite material recording medium, the light of another kind of wavelength is that information is read light, reads the scattered light intensity difference identification read-out recording information of light in measuring point and non-measuring point according to information.
2. the optical storing and reading method that is used for high density information storage medium according to claim 1, it is characterized in that described organic/inorganic composite material is molybdenum trioxide/octadecylamine laminated film, molybdenum trioxide/ethylenediamine laminated film, molybdenum trioxide/cetylamine laminated film or molybdenum trioxide/lauryl amine laminated film.
3, the optical storing and reading method that is used for high density information storage medium according to claim 1 is characterized in that, described information recording light is ultraviolet or black light, and used wavelength is less than 400 nanometers.
4, the optical storing and reading method that is used for high density information storage medium according to claim 1 is characterized in that, it is visible light or near infrared light that described information is read light, and used wavelength is greater than 500 nanometers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01118809XA CN1176458C (en) | 2001-06-14 | 2001-06-14 | Optical storing and reading method for high density information storage medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01118809XA CN1176458C (en) | 2001-06-14 | 2001-06-14 | Optical storing and reading method for high density information storage medium |
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| CN1392543A CN1392543A (en) | 2003-01-22 |
| CN1176458C true CN1176458C (en) | 2004-11-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4200028B2 (en) * | 2003-02-28 | 2008-12-24 | Ｔｄｋ株式会社 | Hologram recording material, manufacturing method thereof, hologram recording medium, hologram recording method, and hologram reproducing method |
| CN101308671B (en) * | 2008-07-10 | 2010-06-02 | 中国科学院化学研究所 | Data reading method for super-high density information storage |
| JP5332462B2 (en) * | 2008-09-29 | 2013-11-06 | ソニー株式会社 | Short pulse light source, laser beam emitting method, optical device, optical disk device, and optical pickup |
| CN105719668B (en) * | 2016-01-18 | 2018-11-13 | 杭州电子科技大学 | A kind of optical information memory storage and its storage method based on light stimulus material |
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