CN115512727A - Super-diffraction limit resolution optical storage medium, preparation method and data read-write method - Google Patents
Super-diffraction limit resolution optical storage medium, preparation method and data read-write method Download PDFInfo
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- CN115512727A CN115512727A CN202211275645.7A CN202211275645A CN115512727A CN 115512727 A CN115512727 A CN 115512727A CN 202211275645 A CN202211275645 A CN 202211275645A CN 115512727 A CN115512727 A CN 115512727A
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- 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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
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- 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
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
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Abstract
The invention discloses an optical storage medium with super-diffraction limit resolution, a preparation method and a data reading and writing method, wherein the optical storage medium comprises a plurality of optical storage medium layers which are periodically stacked, the wavelengths of reading and writing laser beams of any two adjacent optical storage medium layers are different, the thickness of any one optical storage medium layer is smaller than the diffraction limit spot diameter D1 of a laser beam with the minimum wavelength in the reading and writing laser beams, and the total thickness D of the optical storage medium layers in each period is larger than or equal to the diffraction limit spot diameter D2 of a laser beam with the maximum wavelength in the reading and writing laser beams; the laminated surface of the optical storage medium layer is a read-write surface. The optical storage medium disclosed by the invention can be read and written by adopting a single-beam laser light source, breaks through the limitation of the single-beam illumination diffraction limit and achieves the purpose of super-resolution optical storage record reading.
Description
Technical Field
The invention relates to the technical field of optical storage, in particular to an optical storage medium with super-diffraction limit resolution.
Background
In recent years, the worldwide annual data production volume is increased in a blowout mode, the traditional electromagnetic storage mode is difficult to meet the current use requirement, and the optical storage technology has the advantages of low energy consumption, long service life, data safety and the like, and is likely to become the next generation of mainstream data storage system. However, the conventional optical storage technology is limited by the resolution limited by the optical diffraction limit, and the storage capacity cannot be broken through. Therefore, in recent years, a variety of new super-resolution optical storage technologies have been developed, and most typically, the two-beam super-resolution storage technology based on the STED technology is developed.
The principle is shown in fig. 1, two beams of light emitted by a writing beam laser 1 and a suppression beam laser 2 are respectively adjusted into circularly polarized light through a lambda/2 wavelength plate 3 and a lambda/4 wavelength plate 4, the suppression beam is modulated into a hollow annular beam through a vortex phase plate 10 (VPP), then the two beams of light are combined through a dichroic mirror (polarizing beam splitter 7) and focused on the surface of a recording optical storage medium 9 through an objective lens 8, the writing light reacts with a medium material to write data, but the existence of the suppression beam can suppress the reaction of the writing light with the material, the writing beam in the hollow part of the suppression beam can remain the reaction with the material, therefore, the size of the writing data point is smaller than the size of the diffraction limit of the single beam, and super-resolution reading and writing are realized.
The double-beam super-resolution technical scheme can realize super-diffraction limit data reading and writing, but the scheme uses two beams of laser sources, the overall cost is high, the system size is large, the adjustment of a beam combining light path is very difficult, and the data reading and writing quality can be seriously influenced if the centers of the two beams of light are slightly misaligned. Therefore, there is a need for an optical storage medium and system with simple structure and convenient reading and writing to solve the above problems.
Disclosure of Invention
The invention provides an optical storage medium with super-diffraction limit resolution, which aims to solve the problems that a double-beam super-resolution system is required to overcome the diffraction limit in the read-write process of the existing optical storage medium, so that the system is complex in structure, high in overall cost, large in system volume, complex in system adjustment and the like.
The technical means adopted by the invention are as follows:
an optical storage medium with super-diffraction limit resolution comprises a plurality of optical storage medium layers which are periodically stacked, wherein the wavelengths of read-write laser beams of any two adjacent optical storage medium layers are different, the thickness of any one optical storage medium layer is smaller than the diffraction limit spot diameter D1 of the laser beam with the minimum wavelength in the read-write laser beams, and the total thickness D of the optical storage medium layers in each period is larger than or equal to the diffraction limit spot diameter D2 of the laser beam with the maximum wavelength in the read-write laser beams; the laminated surface of the optical storage medium layer is a read-write surface.
Furthermore, the number n of the layers of the optical storage medium layer in each period is greater than or equal to 2, and the wavelengths of the read-write laser beams of any one layer of the optical storage medium layer in each period are different.
Further, the thickness of each optical storage medium layer is equal.
Furthermore, the thickness of each optical storage medium layer is 50-100nm.
Furthermore, the optical storage medium layer is made of photochromic materials.
The invention discloses a preparation method of an optical storage medium with super-diffraction limit resolution, which comprises the following steps: different optical storage medium layer materials are sequentially and periodically stacked by adopting an alternating compounding process to form a plurality of optical storage medium layers, the wavelengths of read-write laser beams of any two adjacent optical storage medium layers are different, the thickness of any one optical storage medium layer is smaller than the diffraction limit spot diameter D1 of the laser beam with the minimum wavelength in the read-write laser beams, and the total thickness D of the optical storage medium layers in each period is larger than or equal to the diffraction limit spot diameter D2 of the laser beam with the maximum wavelength in the read-write laser beams; the laminated surface of the optical storage medium layer is a read-write surface.
Further, the method also comprises the step of cutting the plurality of optical storage medium layers along the direction perpendicular to the stacking direction to form the sheet-shaped optical storage medium.
Further, the alternating composite process is a coating process.
A data read-write method adopting the optical storage medium with super-diffraction limit resolution comprises a data write-in method and a data read-out method;
the data writing method comprises the following steps:
sequentially selecting a laser beam with a wavelength corresponding to a certain optical storage medium layer in one period of the multiple optical storage medium layers as a writing laser beam, and completing data writing of all the optical storage medium layers corresponding to the writing laser beam in the multiple optical storage medium layers through the writing laser beam;
the data reading method comprises the following steps:
and sequentially selecting a laser beam with a wavelength corresponding to a certain optical storage medium layer in a period of the multiple optical storage medium layers as a reading laser beam, and completing data reading of all the optical storage medium layers corresponding to the reading laser beam in the multiple optical storage medium layers through the reading laser beam.
Furthermore, a frequency-adjustable laser is adopted as a data reading and writing light source.
Compared with the prior art, the super-diffraction limit resolution optical storage medium disclosed by the invention has the following beneficial effects: the optical storage medium disclosed by the invention comprises a plurality of optical storage medium layers, the wavelengths of the read-write laser beams of any two adjacent optical storage medium layers are different, and the thickness of any one optical storage medium layer is smaller than the diffraction limit spot diameter d1 of the laser beam with the minimum wavelength in the read-write laser beams, so that the optical storage medium disclosed by the invention can be used for reading and writing by adopting a single-beam laser light source, and the limitation of the single-beam illumination diffraction limit is broken through, thereby achieving the purpose of super-resolution optical storage recording and reading.
Drawings
FIG. 1 is a block diagram of a conventional dual beam super-resolution storage system;
FIG. 2 is a schematic diagram of diffraction spots in a single-beam optical storage technique;
FIG. 3 is a block diagram of a super-diffraction-limited-resolution optical storage medium according to the present disclosure;
FIG. 4 is a schematic diagram of a super-resolution optical storage medium for data writing according to the present disclosure;
FIG. 5 is a schematic diagram of the data reading of the super-diffraction-limit-resolution optical storage medium disclosed in the present invention;
FIG. 6 is a schematic diagram of a process for manufacturing an optical storage medium with super-resolution;
FIG. 7 is a diagram of a single beam system architecture for a super-diffraction limited resolution optical storage medium as disclosed herein;
FIG. 8 is a schematic diagram of data writing by laser beams of different wavelengths in an embodiment of the super-diffraction limit resolution optical storage medium disclosed herein;
FIG. 9 is a schematic diagram of an embodiment of an optical storage medium with super-diffraction-limit-resolution for data writing according to the disclosure;
FIG. 10 is a schematic illustration of data storage capacity of one embodiment of a conventional diffraction limited resolution optical storage medium according to the present disclosure;
FIG. 11 is a diagram illustrating data reading performed by an embodiment of the super-diffraction-limit-resolution optical storage medium disclosed in the present invention.
In the figure: 1. a write beam laser, 2, a suppressed beam laser, 3, a lambda/2 wavelength plate, 4, a lambda/4 wavelength plate, 5, a read detector, 6, a read objective lens, 7, a polarization splitting plate, 8, an objective lens, 9, an optical storage medium, 10, a VPP plate, 11, a diffraction limited spot diameter, 12, a recording spot area, 13, a high reflection area, 14, a low reflection area, 15, a tunable laser, 16, a color filter wheel disc.
Detailed Description
As shown in fig. 3, the invention discloses an optical storage medium with super-diffraction limit resolution, which includes multiple optical storage medium layers that are periodically stacked, wherein the wavelengths of the read-write laser beams of any two adjacent optical storage medium layers are different, preferably, the optical storage medium layers are made of photochromic materials, the thickness of any one optical storage medium layer is smaller than the diffraction limit spot diameter D1 of the laser beam with the minimum wavelength in the read-write laser beams, and the total thickness D of the optical storage medium layers in each period is greater than or equal to the diffraction limit spot diameter D2 of the laser beam with the maximum wavelength in the read-write laser beams; the laminated surface of the multiple optical storage medium layers is a read-write surface.
Specifically, as shown in fig. 3, in the present embodiment, 3 different optical storage medium materials are taken as an example for explanation in each period, a layer unit structure is sequentially provided in each period by the optical storage medium A0, the optical storage medium B0 and the optical storage medium C0, the wavelengths of the read-write laser beams of the optical storage medium A0, the optical storage medium B0 and the optical storage medium C0 are different, the optical storage medium may adopt a film structure formed by a plating process or the like, and then a plurality of optical storage medium layers with a certain thickness are formed by periodically stacking, the structure of the manufactured plurality of optical storage medium layers is the optical storage medium A0, the optical storage medium B0 and the optical storage medium C0 (abbreviated as A0, B0, C0, a 82300, B0 and C0), the thickness of each optical storage medium layer is smaller than the minimum wavelength of the optical storage medium layer D1 in the laser beam, and the maximum diffraction surface diameter of the laser beam D of the laser beam in each period is equal to or larger than the maximum diffraction surface diameter of the read-write laser beam D of the optical storage medium layer in each period.
As shown in fig. 2, a light beam emitted from an object point is focused by a circular aperture optical lens and imaged on an image plane, and due to the limitation of diffraction limit, even if the lens has no aberration at all, the lens does not form a perfect image point, but forms a circular diffraction spot, so that the minimum size of the optical information point recorded and read by the single-beam optical storage technology depends on the diameter of the diffraction limit spot.
The super-resolution optical storage medium disclosed by the invention can break through the limitation of single-beam illumination diffraction limit and achieve the purpose of super-resolution optical storage recording and reading. Specifically, as shown in fig. 3, 4 and 5, the optical storage medium disclosed by the present invention comprises a plurality of optical storage medium layers which are periodically stacked and made of different optical storage medium materials, the wavelengths of the read-write laser beams of any two adjacent optical storage medium layers are different, the thickness of any one of the optical storage medium layers is smaller than the diffraction limit spot diameter D1 of the minimum wavelength laser beam in the read-write laser beams, and the total thickness D of the optical storage medium layers in each period is greater than or equal to the diffraction limit spot diameter D2 of the maximum wavelength laser beam in the read-write laser beams; therefore, when the super-diffraction limit resolution optical storage medium disclosed by the invention is required to be used for data reading and writing, the laser beam with the specific wavelength only acting with one of the optical storage media is used for data reading and writing on the corresponding optical storage medium layer every time, because the laser beam with the specific wavelength which is currently incident can only act with one of the optical storage medium layers and does not act with the medium layers made of other optical storage medium materials, meanwhile, the thickness of each layer of the optical storage medium layer is smaller than the diffraction limit spot diameter d1 of the laser beam with the minimum wavelength in the reading and writing laser beam, namely, when the incident light with the specific wavelength irradiates on the optical storage medium disclosed by the invention, only a small part of area materials in the whole diffraction spot area react to generate a recording point, as shown in fig. 4; when data is read, only a small part of area component materials in the whole diffraction spot area have high reflectivity to the incident light when the light storage medium of the invention is illuminated by the incident light with a specific wavelength, and other area components have low reflectivity to the incident light, so that an optical signal for reading information can be formed, as shown in fig. 5. Therefore, the area of the diffraction spot originally capable of recording only one optical information data point can now record a plurality of optical information data, and the super-resolution optical storage effect is generated. For example, in the present embodiment, when data writing is performed using an optical storage medium with super-diffraction limit resolution made of 3 types of optical storage media A0, B0, and C0, when data writing is performed using a laser beam with a wavelength λ 1, the laser beam with the wavelength λ 1 only acts on the optical storage medium A0, as shown in fig. 8, at this time, the optical storage medium A0 acts on the laser beam with the wavelength λ 1 to generate the optical storage medium A1, and the optical storage media B0 and C0 do not change, that is, only the optical storage medium A0 performs data writing, and when data writing is performed using the laser beam with the wavelength λ 2, the laser beam with the wavelength λ 2 only acts on the optical storage medium B0, as shown in fig. 8, at this time, the optical storage medium B0 acts on the laser beam with the wavelength λ 2 to generate the optical storage medium B1, and the optical storage media A0 and C0 do not change, that is, only the optical storage medium B0 writes data, and when the laser beam with the wavelength λ 3 is used for data writing, the laser beam with the wavelength λ 3 only acts on the optical storage medium C0, as shown in fig. 8, at this time, the optical storage medium C0 acts on the laser beam with the wavelength λ 3 to generate the optical storage medium C1, the optical storage media A0 and B0 do not change, that is, only the optical storage medium C0 writes data, and in the data reading process, similar to the data writing process, the laser beams with the wavelengths λ 4, λ 5, and 6 are respectively used for reading data in the optical storage media A1, B1, and C1, thereby breaking through the limitation of the single-beam illumination diffraction limit and achieving the purpose of super-resolution optical storage recording and reading, and at the same time, because only a single beam is needed for reading and writing, the system structure is simple and the overall cost is low, the system is small in size and simple to adjust. In the above description, the optical storage media A0, B0, and C0 respectively represent dielectric layers made of optical storage materials A0, B0, and C0, the optical storage media A1, B1, and C1 respectively represent dielectric layers formed after the optical storage media A0, B0, and C0 respectively react with corresponding laser beams, the optical storage media A0, B0, and C0 employ photochromic materials, each photochromic material only reacts with a specific wavelength of incident light to generate the optical storage media A1, B1, and C1, and the reactants (the optical storage media A1, B1, and C1) thereof also only exhibit a high reflectivity to the incident light of the specific wavelength.
Furthermore, the number n of layers of the optical storage medium layer in each period is not less than 2, and the wavelengths of the read-write laser beams of any one layer of the optical storage medium layer in each period are different, preferably, the number n of layers of the optical storage medium layer in each period is 2 or 3, so that the types of the optical storage medium layer can be reduced, the manufacturing cost of the optical storage medium can be reduced, the structure of the optical storage medium manufacturing system can be simplified, and the cost can be further reduced.
Furthermore, the thicknesses of the optical storage medium layers are equal, the thicknesses of the layers are equal, the control difficulty of the movement of the laser beam can be reduced, and the laser beam can move equidistantly every time so as to facilitate the reading and writing of data. The thicknesses of the optical storage medium layers may also be unequal, but the difference in thickness is small, so that the laser can read and write the optical storage medium layers in a scanning manner.
Furthermore, the thickness of each optical storage medium layer is 50-100nm, so that better read-write performance is ensured.
The preparation method of the super-diffraction limit resolution optical storage medium disclosed by the invention comprises the following steps of: different optical storage medium layer materials are sequentially and periodically stacked to form a plurality of optical storage medium layers by adopting an alternating composite process, the wavelengths of read-write laser beams of any two adjacent optical storage medium layers are different, the thickness of any one layer of the optical storage medium layer is smaller than the diffraction limit spot diameter D1 of a laser beam with the minimum wavelength in the read-write laser beams, and the total thickness D of the optical storage medium layers in each period is larger than or equal to the diffraction limit spot diameter D2 of a laser beam with the maximum wavelength in the read-write laser beams; the laminated surface of the optical storage medium layer is a read-write surface.
Specifically, this embodiment is described by taking an optical storage medium with super-derivative threshold resolution, which is made of 3 types of optical storage media A0, B0, and C0, where the optical storage media A0, B0, and C0 are three photochromic materials, and the three photochromic materials, A0, B0, and C0, are used as base materials, and may be repeatedly, alternately, compositely integrated to a certain thickness by using processes such as plating to form a multilayer optical storage medium layer, and the structure of the multilayer optical storage medium layer is that the optical storage medium A0, the optical storage medium B0, and the optical storage medium C0 (abbreviated as A0, B0, C0, A0, B0, and C0 \8230; A0, B0, and C0), the thickness of each optical storage medium layer is smaller than the diffraction threshold light spot diameter D1 of the minimum wavelength laser beam in the read-write laser beam, the total thickness D of each optical storage medium layer is not less than or equal to the diffraction threshold light spot diameter D2 in the maximum wavelength laser beam, and the light spot is formed at the laminated direction of the multilayer optical storage medium layer, and the light spot is formed at the perpendicular direction of the optical storage medium layer, and the optical storage medium layer is cut as the laminated direction of the perpendicular light beam, and the optical storage medium layer, and the optical storage medium is formed as the laminated direction of the laminated optical storage medium layer, and the optical storage medium is the laminated direction, and the optical storage medium is the optical storage system is formed as the laminated direction of the perpendicular direction of the laminated optical storage medium layer.
A data read-write method adopting the optical storage medium with super-diffraction limit resolution comprises a data write-in method and a data read-out method;
the data writing method comprises the following steps:
sequentially selecting a laser beam with a wavelength corresponding to a certain optical storage medium layer in a period of the multiple optical storage medium layers as a writing laser beam (the laser beam with the corresponding wavelength is a laser beam capable of reacting with the optical storage medium layer), and completing data writing of all the optical storage medium layers corresponding to the writing laser beam in the multiple optical storage medium layers through the writing laser beam;
the data reading method comprises the following steps:
and sequentially selecting a laser beam with a wavelength corresponding to a certain optical storage medium layer in one period of the multiple optical storage medium layers as a reading laser beam (the laser beam with the corresponding wavelength refers to a laser beam with a higher reflectivity to the optical storage medium layer), and finishing data reading of all the optical storage medium layers corresponding to the reading laser beam in the multiple optical storage medium layers through the reading laser beam.
Furthermore, the data read-write light source adopts a frequency-adjustable laser.
Specifically, as shown in fig. 7, the data reading and writing system for the optical storage medium with super-diffraction limit resolution according to the present invention includes a data reading and writing light source 15, a λ/2 wavelength plate 2, a λ/4 wavelength plate 4, a polarization splitter 7, an objective lens 4, a light filtering wheel disc 16, a reading objective lens 6, and a reading detector 5, preferably, the data reading and writing light source employs a tunable laser, the tunable laser can emit laser beams with multiple wavelengths, the laser beams emitted by the tunable laser are incident on the λ/2 wavelength plate 2, the λ/4 wavelength plate 4, and the polarization splitter 7 and then are incident on an optical storage medium 9 through the λ/4 wavelength plate 4 and the objective lens 4, and the optical storage medium 9 is the optical storage medium with super-diffraction limit resolution according to the present invention. In this embodiment, a data read-write process is described by taking an optical storage medium with super-diffraction limit resolution made of 3 types of optical storage media A0, B0, and C0 as an example, as shown in fig. 8, when data is written by using the read-write system, first, the wavelength of the tunable laser is modulated to λ 1, a laser beam with the wavelength of λ 1 is focused and irradiated to the optical storage medium with super-diffraction limit resolution, only the optical storage medium layer A0 in the optical storage medium with super-diffraction limit resolution is irradiated by the λ 1 laser beam and then converted into the optical storage medium layer A1, components of B0 and C0 do not react with the λ 1 light, as shown in fig. 8 and 9, when data is written, the laser beam moves along the stacking direction of the optical storage medium layers to write data in a row (data writing in a row of A0) in all layers in sequence, and then, after moving a certain distance (the moving distance is generally the diameter of the diffraction limit spot) parallel to one optical storage medium layer, data writing in all the a row in the next row is completed in the sequence; the wavelength of the laser is modulated to lambda 2, lambda 2 light is focused and irradiates the surface of the material, only the component B0 in the material is converted into a material B1 after being irradiated by the lambda 2 light, the components A0 and C0 do not react with the lambda 2 light, the specific writing process of the layer B0 is the same as that of the layer A0, and detailed description is omitted; and modulating the wavelength of the laser to lambda 3 to enable lambda 3 light to focus and irradiate the surface of the material, wherein only the C0 component in the material is converted into the C1 material after being irradiated by the lambda 3 light, the A0 and B0 components cannot react with the lambda 3 light, and the specific writing process of the C0 layer is the same as that of the A0 layer data, so detailed description is omitted. In summary, the tunable laser can be used to write super-resolution optical information data.
If the optical storage medium layers A1, B1, and C1 are set to record data as "1" and the optical storage medium layers A0, B0, and C0 are set to record data as "0", the situation that three sets of data "11010", "10111", and "01011" are written in sequence in the optical storage medium with super-diffraction limit resolution disclosed by the present invention is shown in fig. 9. In contrast, if the existing optical storage medium is used, only 5 bytes of data can be written in the same size, as shown in fig. 10.
When data is read, the wavelength of the frequency-tunable laser is modulated to lambda 4, lambda 4 laser beams do not react with the optical storage medium layers A0, A1, B0, B1, C0 and C1, but the reflectivity of the optical storage medium layer A1 to the lambda 4 wavelength is obviously higher than that of other optical storage medium layers, so that optical information data recorded by the optical storage medium layer A1 can be accurately read by using lambda 4 light; after the A1 series data are scanned and read, the wavelength of the frequency-tunable laser is modulated to lambda 5, lambda 5 light does not react with the components of the optical storage medium layers A0, A1, B0, B1, C0 and C1, but the reflectivity of the optical storage medium layer B1 to the lambda 5 wavelength is obviously higher than that of other optical storage medium layers, so that the optical information data recorded by the optical storage medium layer B1 can be accurately read by using the lambda 5 light; after the scanning and reading of the B1 series of data are finished, the wavelength of the frequency-tunable laser is modulated to lambda 6, lambda 6 light does not react with the optical storage medium layers A0, A1, B0, B1, C0 and C1, but the reflectivity of the optical storage medium layer C1 to the lambda 6 wavelength is obviously higher than that of other optical storage medium layers, so that the optical information data recorded by the optical storage medium layer C1 can be accurately read by using the lambda 6 light; in summary, the tunable laser is used to read the super-resolution optical information data.
If the optical storage medium layers A1, B1, and C1 are set to record data corresponding to "1" and the optical storage medium layers A0, B0, and C0 are set to record data corresponding to "0", the situation of sequentially reading three sets of data of "11010", "10111", "01011" and 15 bytes using the super-resolution optical storage medium disclosed in the present invention is shown in fig. 11.
In addition, the scheme of the invention uses the tunable laser as the multi-wavelength output light source, and actually, the purpose of adjusting the wavelength of the output light source can also be achieved by using a broadband light source in combination with the narrow-band light filtering color wheel disc 16, and the achieving effect is consistent with the tunable laser mentioned in the scheme of the invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (10)
1. An optical storage medium with super-diffraction limit resolution, comprising:
the laser storage medium layer thickness of any two adjacent layers is smaller than the diffraction limit spot diameter D1 of the minimum wavelength laser beam in the read-write laser beam, and the total thickness D of the optical storage medium layers in each period is larger than or equal to the diffraction limit spot diameter D2 of the maximum wavelength laser beam in the read-write laser beam; the laminated surface of the optical storage medium layer is a read-write surface.
2. The super-diffraction limit resolution optical storage medium of claim 1, wherein:
the number n of the optical storage medium layers in each period is more than or equal to 2, and the wavelengths of the read-write laser beams of any one optical storage medium layer in each period are different.
3. The super-diffraction limit resolution optical storage medium according to claim 1 or 2, wherein: the thickness of each optical storage medium layer is equal.
4. The super-diffraction limit resolution optical storage medium of claim 3, wherein: the thickness of each optical storage medium layer is 50-100nm.
5. The super-diffraction limit resolution optical storage medium of claim 1, wherein: the optical storage medium layer is made of photochromic materials.
6. A method for preparing an optical storage medium with super-diffraction limit resolution according to any one of claims 1 to 5, characterized by: the method comprises the following steps:
different optical storage medium layer materials are periodically stacked in turn by adopting an alternating composite process to form a plurality of optical storage medium layers, the wavelengths of the read-write laser beams of any two adjacent optical storage medium layers are different, the thickness of any one layer of the optical storage medium layer is smaller than the diffraction limit spot diameter D1 of the laser beam with the minimum wavelength in the read-write laser beams, and the total thickness D of the optical storage medium layers in each period is larger than or equal to the diffraction limit spot diameter D2 of the laser beam with the maximum wavelength in the read-write laser beams; the laminated surface of the optical storage medium layer is a read-write surface.
7. The method of claim 6, wherein the method comprises the steps of: the method also comprises the step of cutting the multiple optical storage medium layers along the direction perpendicular to the stacking direction to form the sheet-shaped optical storage medium.
8. The method for preparing an optical storage medium with super-diffraction limit resolution of claim 6 or 7, wherein: the alternating composite process is a film coating process.
9. A method for reading and writing data using the super-diffraction limit resolution optical storage medium according to any one of claims 1 to 5, wherein: the method comprises a data writing method and a data reading method;
the data writing method comprises the following steps:
sequentially selecting a laser beam with a wavelength corresponding to a certain optical storage medium layer in a period of the multiple optical storage medium layers as a writing laser beam, and completing data writing of all the optical storage medium layers corresponding to the writing laser beam in the multiple optical storage medium layers through the writing laser beam;
the data reading method comprises the following steps:
and sequentially selecting a laser beam with a wavelength corresponding to a certain optical storage medium layer in one period of the multiple optical storage medium layers as a reading laser beam, and finishing data reading of all the optical storage medium layers corresponding to the reading laser beam in the multiple optical storage medium layers through the reading laser beam.
10. The method for reading from and writing to the super-diffraction limit resolution optical storage medium of claim 9, wherein: the data read-write light source adopts a frequency-adjustable laser.
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