CN113838486B - Coding information writing and interferometry reading method and device for nano-inscribed optical disk - Google Patents
Coding information writing and interferometry reading method and device for nano-inscribed optical disk Download PDFInfo
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- 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
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00772—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track on record carriers storing information in the form of optical interference patterns, e.g. holograms
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- 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
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
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Abstract
The invention provides a method for writing coded information of a nano-inscribed optical disk and reading by interferometry, which comprises the following steps: carrying out 2 m -system data coding on the information to be stored to obtain storage numbers, wherein each bit of the storage numbers corresponds to m pieces of binary information; storing and digital writing is carried out on each storage site in the form of m recording points by a nano information writing method, and the m recording points respectively correspond to m different optical path information after information is recorded; one of the reading beams irradiates the storage site, the reflected light is collected and interfered with the fixed phase beam of the reading beam, the light intensity interference result is measured, and the reading of the storage number is realized according to the corresponding relation between the light intensity interference result and the storage number. The invention also provides a corresponding reading device. The method of the invention improves the information storage capacity through nano lithography, and simultaneously adopts an interferometry method as a reading method of the optical disk, thereby realizing the rapid information reading of the optical disk with high storage density.
Description
Technical Field
The present invention relates to the field of optical technology, and in particular, to a method and apparatus for writing and interferometry reading encoded information of a nano-writing optical disc.
Background
With the development of techniques such as gene sequencing and brain activity reading, not only a large amount of data is generated, but also higher requirements are put on how the data is effectively, stably and accurately stored. Based on the background, the optical disk storage technology well meets the requirements of the era due to the advantages of energy conservation, long storage life, good safety, easiness in processing and the like. With respect to the optical disc technology, the storage capacity limitation seriously hinders the development of the optical disc technology.
In order to increase the capacity of the optical disc, a conventional technical route is to reduce the size of the recording spot. With the successful development of short wavelength laser diode (GaN blue-green laser), blue-ray disc is becoming the dominant storage mode in the optical disc market. Early CD discs, with a recording laser wavelength of 780nm, a numerical aperture of 0.45, a track pitch of 1.6 μm, and a single layer storage capacity of only 650MB; the subsequent DVD optical disc has a recording laser wavelength of 650nm, a numerical aperture of 0.6, a track pitch of 0.74 μm, and a single-layer storage capacity of 4.7GB; the current blue-ray disc has a recording laser wavelength of 405nm, a numerical aperture of 0.85, a track pitch of 0.32 mu m, and a track pitch of only half of that of a red-light DVD disc (0.74 mu m), and a single-layer storage capacity of up to 25GB, and meanwhile, the blue-ray disc achieves a multi-layer writing effect by utilizing different reflectivities, thereby realizing the storage of 12 layers of 300GB blue-ray discs.
In order to further break through the limitation of the storage capacity of the optical disc, researchers have also proposed some methods for improving the storage capacity.
The Gu Min research team in australia in 2009 uses the response difference of gold nano-wires with different length-to-width ratios to lasers with different wavelengths and polarization directions to realize three-layer five-dimensional (and polarization) optical information storage in thickness, and the S.W Hell research team provides a novel microscopy RESOLFT (reversible saturable optical
'Fluorescence' transition between two states), the light curing and light switching characteristics of the green fluorescent protein (rsEGFP) are utilized, a high-density light storage experiment with a 250nm point spacing is realized by a super-resolution writing and reading method, and the storage stability and the storage life of the optical disc are greatly reduced by adopting a fluorescent protein to store data, and meanwhile, compared with the traditional optical disc technology, the manufacturing cost of the optical disc is also improved. The Gu Min research team in australia in 2012 combines the principles of photopolymerization and super-resolution stimulated radiation loss technology, a1, 5-bis (p-dimethylaminooctanoyl imide) cyclopentanone (BDCC) material system is utilized to realize a photoetching channel width of 9nm and a channel spacing of 52nm (Nature Communications,2013, 4.6:2061), and optical disc information can be written in high density by utilizing the mechanism of photopolymerization lithography. Accordingly, gu Min research team applied for international patent, see patent document PCT/AU2013/001378, however, this solution cannot realize reading of the written information of the optical disc, and the technical route is still not clear.
Disclosure of Invention
The invention aims to provide a method and a device for writing and interferometry reading coding information of a nano-writing optical disc, so as to improve the storage density and capacity of the optical disc and the reading density and speed of the optical disc.
In order to achieve the above object, the present invention provides a method for writing and interferometry reading encoded information of a nano-writing optical disc, comprising:
S1: carrying out 2 m -system data coding on the information to be stored to obtain a storage digital code, wherein each bit of the storage digital code corresponds to m pieces of binary information respectively;
s2: providing storage sites which are sequentially arranged along an optical disc writing recording layer, and writing one-bit storage digital code on each storage site in the form of m recording points by a nano information writing method, wherein the m recording points respectively correspond to m different optical path information after information is written;
S3: and irradiating one of the reading light beams on the storage site, collecting reflected light of the storage site, interfering with a fixed phase light beam of the reading light beam, measuring a light intensity interference result, and reading the storage digital code at the storage site according to the corresponding relation between the light intensity interference result and the storage digital code.
Whether each recording point is used for information recording corresponds to two numbers in the binary system respectively.
In the step S2, the nano information writing method includes:
s21: the information writing beam is obtained through nano information writing methods of nano photoetching, plasma etching, electron beam etching or mask exposure, and nano optical path information which is far smaller or smaller than the size of a reading beam spot of an optical disk is written through the information writing beam so as to realize nano information writing;
S22: and in each storage site, carrying out one-dimensional or two-dimensional information recording of m recording points according to the storage digital code by a nano information recording method.
In the step S22, each recording point directly etches different depths l i on the optical disc writing recording layer by the information writing beam or irradiates the optical material refractive index n i of the optical disc writing recording layer by the information writing beam to obtain corresponding optical path information, and the information writing beam controls the etching depth l i or the change amount of the optical material refractive index n i by changing the irradiation time or the power of the beam.
When the information writing beam is used for directly etching different depths l i on the optical disc writing recording layer to obtain corresponding optical path information, the value of the optical path information is n ili,ni, i i is the etching depth, which is the refractive index of the optical material of the optical disc writing recording layer; the optical material of the optical disc writing recording layer includes 1) an organic dye; 2) Phenolic resin polymers; 3) A photosensitive material; and 4) at least one of SiO 2、GaF2 or MgF 2, silicate glass, and metal ion doped glass-like materials.
The organic dye comprises at least one of cyanine, phthalocyanine and azo; the photosensitive material includes at least one of PMMA and PDMS.
When the information writing beam irradiates and changes the refractive index n i of the optical material of the optical disc writing recording layer to obtain corresponding optical path information, the actual value of the optical path information is 2l i(ni-ns),li which is the etching depth, n i which is the refractive index of the optical material when the optical disc writing recording layer is not written, and n s which is the refractive index of the optical material after the optical disc writing recording layer is written; the optical material of the optical disc writing recording layer is a phase change material, and the optical material changes its crystalline phase after laser irradiation, resulting in a change in refractive index or dielectric constant.
The phase change material includes at least one of GaSbBi, gaSbTe, sbTeGe and SrTiO 3.
The step S3 includes: s31: acquiring a reading light beam and dividing the reading light beam into two reading light beams; s32: irradiating one of the reading beams on the storage site to form a reading beam spot with the size equivalent to that of the storage site, and collecting reflected light of the storage site; s33: generating a stationary phase beam using another of the read beams; s34: combining the reflected light in the step S32 and the fixed-phase light beam in the step S33 to form a light intensity interference result; s35: and measuring a light intensity interference result, and according to the corresponding relation between the light intensity interference result and the stored digital code, reversely solving whether information recording of m recording points is performed or not, so as to read the stored digital code at the storage position.
The corresponding relation between the light intensity interference result and the stored digital code is as follows:
wherein I is the light intensity interference result; Is the electric field of the reflected light of the storage site, E n is the electric field of the fixed phase beam; m represents the number of recording points of the storage site; i 0、I0 'and I 0、I0' are used as the main components For a fixed light field intensity and phase coefficient,Is the phase of the fixed phase beam; the phase corresponding to the recorded information is the recording point i; The corresponding phase when the recording point i is in the state of not carrying out information recording; and (3) respectively corresponding to the 0 and 1 to determine whether the information is recorded at the recording point i.
On the other hand, the invention also provides an interferometry reading device, which is used for reading a storage digital code on an optical disc to be tested, wherein storage sites are sequentially arranged on an optical disc writing recording layer of the optical disc to be tested, the storage digital code is written in the form of m recording points on each storage site through a nano information writing method, and the m recording points respectively correspond to m different optical path information after information is written;
The interferometry reading device comprises an optical path module and a control module, wherein the optical path module comprises a first optical axis and a second optical axis which are perpendicularly intersected, a beam splitter is arranged at the intersection point of the first optical axis and the second optical axis, a laser, the beam splitter, a first focusing lens or an objective lens and the optical disk to be detected are sequentially arranged along the first optical axis, and a reflecting mirror, the beam splitter and a detector are sequentially arranged along the second optical axis; the laser is arranged to emit a collimated laser beam of a preset wavelength as a reading beam; the first focusing lens or the objective lens is arranged to focus and irradiate one of the reading beams to the storage site, form a reading beam spot with the size equivalent to that of the storage site, and collect reflected light of the storage site; the mirror is arranged to reflect another of the read beams to produce a stationary phase beam; the beam splitter is arranged to split the reading beam into two beams, combine the reflected light collected by the first focusing lens or the objective lens with the fixed-phase beam generated by the reflecting mirror, and form a light intensity interference result; the detector measures the light intensity interference result; the control module is arranged to receive the light intensity interference result and read the stored digital code at the storage site according to the corresponding relation between the light intensity interference result and the stored digital code.
The detector is a photoelectric detector, a second focusing lens is arranged on a second optical axis between the beam splitter and the detection, and the second focusing lens is arranged to focus the light intensity interference result to the photoelectric detector; or the detector is an area array detector.
A chromatic aberration compensating lens or objective lens which is the same as the first focusing lens or objective lens is arranged between the beam splitter and the reflecting mirror.
On the other hand, the invention also provides a Zernike phase contrast microscopic reading device which is used for reading a storage digital code on an optical disc to be tested, wherein storage sites are sequentially arranged on an optical disc writing recording layer of the optical disc to be tested, the storage digital code is written in each storage site in the form of m recording points by a nano information writing method, and the m recording points respectively correspond to m different optical path information after information writing; the Zernike phase contrast microscopic reading device comprises a light path module and a control module, wherein the light path module comprises a first optical axis and a second optical axis which are perpendicularly intersected, a beam splitter is arranged at the intersection point of the first optical axis and the second optical axis, a laser, an annular diaphragm and the beam splitter are sequentially arranged along the first optical axis, and the optical disc to be detected, an objective lens, a phase plate, a focusing lens and a photoelectric detector are sequentially arranged along the second optical axis; the laser is arranged to emit a collimated laser beam of a preset wavelength as a reading beam; the annular diaphragm is arranged to modulate the reading beam into an annular shape; the beam splitter is configured to reflect and impinge the reading beam on an optical axis of an objective lens, and to transmit light collected by the objective lens; the objective lens is arranged to focus and irradiate the reading light beam on the storage site to form a reading light beam spot with the same size as the storage site, one beam of the reading light beam is subjected to phase modulation by the recording site to form reflected light of the storage site, the other beam of the reading light beam is directly reflected to form annular mirror reflection light, and the reflected light of the storage site and the mirror reflection light are collected; the phase plate is configured to phase modulate the mirrored light to produce a stationary phase light beam; the focusing lens is configured to combine the reflected light and the fixed phase light beam to form a light intensity interference result; the photoelectric detector is used for measuring the light intensity interference result; the control module is arranged to receive the light intensity interference result and read the stored digital code at the storage site according to the corresponding relation between the light intensity interference result and the stored digital code.
The method for writing the coded information of the nano-writing optical disc and reading the coded information by interferometry improves the information storage capacity of the optical disc by nano-photoetching and writing the m-bit recording points with different optical path information at the storage position on the writing recording layer of the optical disc; meanwhile, an interferometry method is adopted as a reading method of the optical disk, m binary information is decoded from a light intensity interference result, and accurate reading of information recording points with nanometer size and rapid information reading of the high-storage-density optical disk with the information recording points smaller than an optical diffraction limit can be realized, so that the storage capacity and the reading and writing efficiency of the optical disk are improved. The interferometry reading device and the Zernike phase contrast microscopic reading device have strong expandability, and do not need to greatly improve the existing optical drive system.
Drawings
Fig. 1 is a schematic diagram of the coding information writing and the coding writing steps of the interferometry reading method of the nano-scale optical disc according to the first embodiment of the present invention.
Fig. 2A is a schematic flow chart of an interferometry reading step of the method for writing and interferometry reading encoded information of a nano-inscribed optical disc according to the first embodiment of the present invention.
Fig. 2B is a schematic diagram of an interferometric reading step of the method for writing and reading encoded information of a nano-inscribed optical disc according to the first embodiment of the present invention.
Fig. 2C is a schematic diagram showing a correspondence between encoded information writing and interferometry reading steps of a method for interferometry reading of a nano-inscribed optical disc according to a first embodiment of the present invention.
FIG. 3A is a schematic diagram of an interferometric reading device according to a second embodiment of the invention.
Fig. 3B is a schematic structural diagram of an interferometric reading device with chromatic aberration compensating dual lenses according to a third embodiment of the invention.
Fig. 4 is a schematic structural diagram of a zernike phase contrast microscopic reading device according to a fourth embodiment of the present invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Encoded information writing and interferometry reading method for nano-inscribing optical disc of first embodiment
Fig. 1 shows a method for writing and interferometry reading encoded information of a nano-writing optical disc according to an embodiment of the present invention, which comprises the following steps:
Step S1: carrying out data coding on the information to be stored in a2 m -bit system, namely converting the original binary number into a2 m -bit system, combining every continuous m-bit binary number into a one-bit storage number, and obtaining the storage number, wherein when m=4, the eight-bit binary number of '10010001' is changed into a two-bit hexadecimal number '1001/0001' = '9/1'; each bit of the stored number corresponds to m binary information, respectively.
Step S2: providing storage sites 103 which are sequentially arranged along the optical disc writing recording layer 102, and writing one-bit storage digital codes (namely m binary information) on each storage site 103 in the form of m recording points 104 by a nano information writing method, wherein the m recording points 104 respectively correspond to m different optical path information after information is written; since each recording spot 104 at a storage location represents 1 bit of information, the capacity of information stored at each storage location is extended to m bits.
Whether each recording point 104 performs information recording corresponds to two numbers of "0" and "1" in binary system, i.e. the recording point 104 performs information recording to indicate the number "1", otherwise, the number "0". Thus, the information recording of each recording point (i.e. each bit) of the storage number in the step S1, i.e. the writing of m different optical path information, is realized by m recording points 104 at each storage location 103.
In the step S2, the nano information writing method includes:
step S21: the information writing beam 101 is obtained by a nano information writing method of nano photoetching, plasma etching, electron beam etching or mask exposure, and nano information writing is realized by writing nano optical path information of which the size is far smaller or smaller than that of a reading beam spot of an optical disc by the information writing beam;
The information writing beam 101 is a laser beam, a particle beam or an electron beam, the size of which is much smaller or smaller than the size of the read beam spot of the optical disc and the size of which is much smaller than the size of the storage site 103, and in this embodiment, the size of the information writing beam 101 may be smaller or equal to the size of the optical diffraction limit spot of the read beam wavelength and thus smaller than the size of the read beam spot because the size of the read beam spot is larger or equal to the size of the optical diffraction limit spot of the read beam wavelength. Wherein the size of the reading beam spot is λ/2NA, λ is the wavelength of the reading beam, NA is the lens NA (numerical aperture) of the reading beam.
Step S22: in each storage location 103, information recording of m recording points 104 is performed according to the stored digital code by the information writing beam 101.
Each recording point 104 has corresponding optical path information after information is recorded, each recording point 104 directly etches different depths l i on the optical disc writing recording layer 102 through the information writing beam 101 or irradiates the information writing beam 101 to change the optical material refractive index n i of the optical disc writing recording layer 102 to obtain corresponding optical path information, and the information writing beam 101 controls the etching depth l i or the change amount of the optical material refractive index n i through changing irradiation time or changing beam power. In this way, the corresponding recording point 104 can be identified with the corresponding optical path information as a tag in the subsequent reading step.
When the information writing beam 101 directly etches different depths l i on the optical disc writing recording layer 102 to obtain corresponding optical path information, the value of the optical path information is n ili,ni, i.e. the refractive index of the optical material of the optical disc writing recording layer 102, and l i is the etching depth. The information writing beam 101 controls the etching depth l i by changing the irradiation time or changing the beam power, and the optical material of the optical disc writing recording layer 102 generates photoinduced refractive index, dielectric constant change or photoinduced etching after laser irradiation, and the optical material comprises 1) organic dye, wherein the common organic dye comprises at least one of cyanine, phthalocyanine, azo and the like; 2) Phenolic resin polymers; 3) A photosensitive material including at least one of PMMA and PDMS; 4) SiO 2、GaF2, mgF 2, silicate glass, glass materials doped with metal ions, and the like.
When the information writing beam 101 irradiates and changes the refractive index n i of the optical material of the optical disc writing recording layer 102 to obtain the corresponding optical path information, the actual value of the optical path information is 2l i(ni-ns),li, n i is the refractive index of the optical material when the optical disc writing recording layer 102 is not written, and n s is the refractive index of the optical material after the optical disc writing recording layer 102 is written. The information writing beam 101 controls the amount of change in refractive index n i of the optical material by changing the irradiation time period or changing the beam power, and the optical material of the optical disc writing recording layer 102 is a phase change material having a phase change property, i.e., the optical material changes in crystalline phase of the optical material after laser irradiation, thereby causing a change in refractive index or dielectric constant.
The phase change material includes at least one of GaSbBi, gaSbTe, sbTeGe and SrTiO 3, etc.
In addition, the m recording points 104 in each storage site 103 may be arranged in a one-dimensional linear distribution or a two-dimensional planar distribution, and need not be arranged in a lattice form, and the m recording points 104 may be adjacent to each other with no special requirement for the distance therebetween. Meanwhile, the value of m depends on the resolving power of the interferometric reading method below.
Step S3: as shown in fig. 2A, an interferometric reading step is performed, that is, for an optical disc in which storage information has been written, one of the read beams is irradiated to the storage location 103, reflected light from the storage location 103 is collected and interfered with another beam of the read beam with a fixed phase, a light intensity interference result (that is, laser intensity after interference superposition) is measured, and reading of the storage number at the storage location 103, that is, reading of m binary information is implemented according to a correspondence between the light intensity interference result and the storage number.
The step S3 includes:
Step S31: a read beam is acquired and split into two read beams. In this embodiment, the read beam is a collimated laser beam and is split into two beams by a beam splitter 302.
The reading beam is obtained directly by using the laser 301, or is obtained by using and modulating the laser output by the laser 301.
Step S32: one of the read beams is irradiated onto the storage site 103 to form a read beam spot corresponding to the size of the storage site 103, and after phase modulation is performed on m recording points 104, reflected light of the storage site 103 is collected. Thereby, m recording points at the storage site corresponding to different optical path information modulate the phase of the irradiation laser light.
In this embodiment, one of the read beams is focused and irradiated onto the storage site 103 by a first focusing lens or objective lens 303, and the reflected light of the storage site 103 is collected by the first focusing lens or objective lens 303.
Step S33: a fixed phase beam is generated using the other of the read beams.
In this embodiment, the other beam of the read beam is reflected by a mirror 304 to generate a stationary phase beam.
Step S34: combining the reflected light in the step S32 and the fixed phase light beam in the step S33 and forming a light intensity interference result.
Step S35: and (3) measuring the light intensity interference result, and reversely solving whether information recording of m record points is performed (namely, whether information recording is performed on each record point i in the reflected light exists in the m different optical path information or not) according to the corresponding relation between the light intensity interference result and the stored digital code, so as to realize the reading of the stored digital code at the storage position 103.
Wherein the result of the light intensity interference is measured by a detector 306, and the detector 306 may be a photodetector.
As shown in FIG. 2B, the measured light intensity interference results in the electric field of the reflected light from the storage site 103An electric field with the fixed phase beamIs a superposition of (3).
Wherein, Is the phase of the fixed phase beam; the phase corresponding to the recorded information is the recording point i; the corresponding phase is when the recording point i is in the information recording. Wherein, Δn=n 1-n2,n1 is the refractive index of the material after writing optical path information, n 1 is the refractive index of air for the recording mode by etching, n 2 is the refractive index of the optical disc writing recording layer 102, and l i is the writing depth of the i-th recording point; the 0 and the 1 correspond to whether the information is recorded at the recording point i or not, namely, two numbers in binary corresponding to the recording point i. Electric field of fixed phase beamOnly one planar light field, dependent on propagation distance; the propagation distance is fixed, and the optical field phase is fixed.
Therefore, the correspondence between the light intensity interference result and the stored digital code is:
Wherein I is the light intensity interference result, and includes the intensity of the total reflected light field formed by coherent superposition of the light field of the reflected light of the storage site 103 and the light field of the fixed phase light beam; Is the electric field of the reflected light of the storage site 103, E n is the electric field of the fixed phase beam; m represents the number of recording points of the storage location 103; i 0、I0 'and I 0、I0' are used as the main components For a fixed light field intensity and phase coefficient,Is the phase of the fixed phase beam; the phase corresponding to the recorded information is the recording point i; The corresponding phase when the recording point i is in the state of not carrying out information recording; and (3) respectively corresponding to '0' and '1' (namely, 0 and 1 of the matrix [1] in the formula) whether writing information is recorded at the recording point i or not, namely, two numbers in binary corresponding to the recording point i.
Therefore, the correspondence between the light intensity interference result (i.e. the laser intensity after interference superposition) and the stored digital code can be obtained through calculation, as shown in fig. 2C, taking m=3 as an example, 201 to 208 are light intensity interference results respectively, and these light intensity interference results 201 to 208 respectively correspond to the writing situations 209 to 216 of different optical path information on m recording points, i.e. m-bit binary information of the stored digital code in sequence.
Therefore, the storage numbers at each storage site can be decoded from the light intensity interference result information corresponding to each storage site by combining the steps S31-S35, and the m-bit storage information can be read at one time according to the corresponding relation between the light intensity interference result and the storage numbers, so that the reading speed of the optical disc is greatly accelerated.
Second embodiment interferometric reading device
An interferometric reading device according to one embodiment of the invention is shown in FIG. 3A. The device is used for reading a storage code on an optical disc 100 to be tested, the optical disc 100 to be tested is shown in fig. 1 and described above, storage sites 103 are sequentially arranged on an optical disc writing recording layer 102, the storage code is written on each storage site 103 in the form of m recording points 104 by a nano information writing method, and the m recording points 104 respectively correspond to m different optical path information after information writing.
The interferometry reading device includes an optical path module, the optical path module includes a first optical axis and a second optical axis that are perpendicularly intersected, a beam splitter 302 is disposed at an intersection point of the first optical axis and the second optical axis, a laser 301, the beam splitter 302, a first focusing lens or objective 303, and the optical disc 100 to be measured are sequentially arranged along the first optical axis, and a reflecting mirror 304, the beam splitter 302, a second focusing lens 305, and a detector 306 are sequentially arranged along the second optical axis.
Wherein the laser 301 is arranged to emit a collimated laser beam of a preset wavelength as a reading beam.
The first focusing lens or objective 303 is arranged to focus one of the read beams onto the storage location 103, form a read beam spot of a size comparable to the storage location 103, and collect the reflected light of the storage location 103.
The mirror 304 is arranged to reflect another of the read beams to produce a stationary phase beam.
The beam splitter 302 is configured to split the reading beam into two beams, and combine the reflected light collected by the first focusing lens or objective lens 303 with the fixed phase beam generated by the reflecting mirror 304, and form a light intensity interference result.
The second focusing lens 305 is arranged to focus the light intensity interference result to the photodetector 306.
The detector 306 is arranged to measure the result of the light intensity interference, which is preferably a photodetector.
In addition, the interferometry reading device further includes a control module, where the control module may use CPU, MCU, SOC control devices, and the control module is configured to receive the light intensity interference result, and implement reading of the stored digital code at the storage location 103 according to the correspondence between the light intensity interference result and the stored digital code.
Third embodiment color difference compensating Dual-lens interferometric reading device
According to a third embodiment of the present invention, in order to eliminate the effect of chromatic aberration generated by the first focusing lens or objective lens on the measurement of the interference superposition intensity, an equivalent focusing lens or objective lens may be symmetrically added to eliminate the effect of chromatic aberration.
As shown in fig. 3B, the optimized interferometric reading device with chromatic aberration compensation double lenses includes: the optical path module and the control module are identical to those of the second embodiment; the laser 401, the beam splitter 402, the first focusing lens or objective 403, the reflecting mirror 404, the second focusing lens 405 and the photodetector 406 of the optical path module are identical to the laser 301, the beam splitter 302, the first focusing lens or objective 303, the reflecting mirror 304, the second focusing lens 305 and the photodetector 306 of the second embodiment in structure and function, and the optical path module in this embodiment is different from the optical path module in the second embodiment only in that a chromatic aberration compensating lens or objective 407 is provided between the beam splitter 402 and the reflecting mirror 404, so as to eliminate the phase difference caused by chromatic aberration and aberration of the lens or objective, and improve the signal measurement accuracy. Note that the chromatic aberration compensating lens or objective lens 407 should be selected from the same lenses or lenses as the first focusing lens or objective lens 403.
In addition, in the above second and third embodiments, the photodetector may be replaced with an area array detector to directly image the interference fringes by the area array detector to measure the light intensity interference result, and whether or not each recording point i is subjected to information recording is reversely solved according to the interference fringe spacing and the light intensity distribution. The method for directly imaging interference fringes by adopting the area array detector to replace the photoelectric detector needs to remove the second focusing lens and directly uses the area array detector to replace the photoelectric detector.
Fourth embodiment Zernike phase contrast microscopic reading device
Fig. 4 shows a zernike phase contrast microscopic reading device according to a fourth embodiment of the present invention, which functions as the interferometric reading device in the second embodiment and the third embodiment, and is also used for reading the storage numbers on an optical disc 100 to be tested, where the storage numbers are written in m recording points 104 on each storage point 103 by a nano information writing method, and the m recording points 104 respectively correspond to m different optical path information after information writing, as shown in fig. 1 and described above, on the optical disc writing recording layer 102.
The device replaces a double-objective interference system in an interference measuring device by matching the annular diaphragm with the phase difference objective lens, measures a light intensity interference result by a photoelectric detector, and reads m-bit storage information according to the corresponding relation between the light intensity interference result and a storage number.
In this embodiment, the zernike phase-contrast microscopic reading device includes an optical path module, where the optical path module includes a first optical axis and a second optical axis that are perpendicularly intersected, an intersection point of the first optical axis and the second optical axis is provided with a beam splitter 503, a laser 501, an annular diaphragm 502, and the beam splitter 503 are sequentially arranged along the first optical axis, and the optical disc 100 to be measured, an objective lens 504, a phase plate 507, a focusing lens 508, and a photodetector 509 are sequentially arranged along the second optical axis.
The laser 501 is configured to emit a collimated laser beam of a preset wavelength as a reading beam; the annular diaphragm 502 is arranged to modulate the read beam into an annular shape.
The beam splitter 503 is arranged to reflect and impinge the reading beam on the optical axis of the objective lens 504 and to transmit the light collected by the objective lens 504.
The objective lens 504 is configured to focus and irradiate the reading beam onto the storage site 103 to form a reading beam spot corresponding to the size of the storage site 103, one beam of the reading beam is phase-modulated by the recording site 104 to form reflected light of the storage site 103, and the other beam of the reading beam is directly reflected to form annular mirror reflection light, and the reflected light of the storage site 103 and the mirror reflection light are collected.
The phase plate 507 is arranged to phase modulate the annular mirrored light to produce a fixed phase beam. The phase plate reflects the light part through the annular mirror image, so that the amplitude of the laser is weakened, and a certain phase delay is generated, so that the interferometry reading method has higher resolution capability. The phase modulation includes phase delaying the illuminating laser to lambda/2 to make the interference effect more pronounced.
The focusing lens 508 is configured to combine the reflected light and the stationary phase light beam to form a light intensity interference result.
The photodetector 509 is arranged to measure the result of the light intensity interference.
In addition, the device further comprises a control module, wherein the control module can adopt CPU, MCU, SOC and other control devices, and the control module is arranged to receive the light intensity interference result and realize the reading of the stored digital code at the storage site 103 according to the corresponding relation between the light intensity interference result and the stored digital code.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and various modifications can be made to the above-described embodiment of the present invention. All simple, equivalent changes and modifications made in accordance with the claims and the specification of this application fall within the scope of the patent claims. The present invention is not described in detail in the conventional art.
Claims (10)
1. The method for writing and interferometry reading the coded information of the nano-inscribed optical disk is characterized by comprising the following steps:
Step S1: carrying out 2 m -system data coding on the information to be stored to obtain a storage digital code, wherein each bit of the storage digital code corresponds to m pieces of binary information respectively;
Step S2: providing storage sites which are sequentially arranged along an optical disc writing recording layer, and writing one-bit storage digital code on each storage site in the form of m recording points by a nano information writing method, wherein the m recording points respectively correspond to m different optical path information after information is written;
Step S3: one of the reading light beams irradiates the storage site, collects reflected light of the storage site and interferes with a fixed phase light beam of the reading light beam, measures a light intensity interference result, and reads a storage digital code at the storage site according to a corresponding relation between the light intensity interference result and the storage digital code;
The step S3 includes:
step S31: acquiring a reading light beam and dividing the reading light beam into two reading light beams;
Step S32: irradiating one of the reading beams on the storage site to form a reading beam spot with the size equivalent to that of the storage site, and collecting reflected light of the storage site;
step S33: generating a stationary phase beam using another of the read beams;
Step S34: combining the reflected light in the step S32 and the fixed-phase light beam in the step S33 to form a light intensity interference result;
Step S35: measuring a light intensity interference result, and reversely solving whether information recording of m recording points is performed or not according to the corresponding relation between the light intensity interference result and the stored digital code, so as to read the stored digital code at the storage point;
the corresponding relation between the light intensity interference result and the stored digital code is as follows:
Wherein I is the result of light intensity interference; Is the electric field of the reflected light of the storage site, E n is the electric field of the fixed phase beam; m represents the number of recording points of the storage site; i 0、I0 'and I 0、I0' are used as the main components For a fixed light field intensity and phase coefficient,Is the phase of the fixed phase beam; the phase corresponding to the recorded information is the recording point i; The corresponding phase when the recording point i is in the state of not carrying out information recording; and (3) respectively corresponding to the 0 and 1 to determine whether the information is recorded at the recording point i.
2. The method of claim 1, wherein each recording point is used for recording information corresponding to two numbers in binary system.
3. The method of writing and interferometry reading encoded information of a nanoinscribed optical disc according to claim 1, wherein in the step S2, the nanoinformation writing method comprises:
Step S21: the information writing beam is obtained through nano information writing methods of nano photoetching, plasma etching, electron beam etching or mask exposure, and nano optical path information which is far smaller or smaller than the size of a reading beam spot of an optical disk is written through the information writing beam so as to realize nano information writing;
step S22: and in each storage site, carrying out one-dimensional or two-dimensional information recording of m recording points according to the storage digital code by a nano information recording method.
4. The method according to claim 3, wherein in the step S22, each recording spot etches different depths i i directly on the optical disc writing recording layer by the information writing beam or the information writing beam irradiates the optical material refractive index n i of the optical disc writing recording layer to obtain corresponding optical path information, and the information writing beam controls the etching depth i i or the amount of change of the optical material refractive index n i by changing the irradiation time or the beam power.
5. The method for writing and interferometry reading encoded information on a nano-scale optical disc according to claim 4, wherein when the information writing beam is used to directly etch different depths l i on the optical disc writing recording layer to obtain corresponding optical path information, the value of the optical path information is n ili,ni, which is the refractive index of the optical material of the optical disc writing recording layer, and l i is the etching depth; the optical material of the optical disc writing recording layer includes 1) an organic dye; 2) Phenolic resin polymers; 3) A photosensitive material; and 4) at least one of SiO 2、GaF2、MgF2, silicate glass, and metal ion doped glass-based materials.
6. The method for writing and interferometry reading encoded information on a nano-scale optical disc according to claim 4, wherein when the information writing beam irradiates to change the refractive index n i of the optical material of the optical disc writing recording layer to obtain the corresponding optical path information, the actual value of the optical path information is 2l i(ni-ns),li, n i is the refractive index of the optical material when the optical disc writing recording layer is not written, and n s is the refractive index of the optical material after the optical disc writing recording layer is written; the optical material of the optical disc writing recording layer is a phase change material, i.e. the optical material changes its crystalline phase after laser irradiation, resulting in a change of refractive index or dielectric constant.
7. An interferometry reading device for implementing the method for writing and interferometry reading encoded information of a nano-writing optical disc according to claim 1, wherein the interferometry reading device is used for reading a storage number on an optical disc to be measured, storage sites are sequentially arranged on an optical disc writing recording layer of the optical disc to be measured, the storage number is written in m recording points on each storage site by a nano-information writing method, and the m recording points respectively correspond to m different optical path information after information is written;
the interferometry reading device comprises an optical path module and a control module, wherein the optical path module comprises a first optical axis and a second optical axis which are perpendicularly intersected, a beam splitter is arranged at the intersection point of the first optical axis and the second optical axis, a laser, the beam splitter, a first focusing lens or an objective lens and the optical disk to be detected are sequentially arranged along the first optical axis, and a reflecting mirror, the beam splitter and a detector are sequentially arranged along the second optical axis;
The laser is arranged to emit a collimated laser beam of a preset wavelength as a reading beam;
The first focusing lens or the objective lens is arranged to focus and irradiate one of the reading beams to the storage site, form a reading beam spot with the size equivalent to that of the storage site, and collect reflected light of the storage site;
the mirror is arranged to reflect another of the read beams to produce a stationary phase beam;
The beam splitter is arranged to split the reading beam into two beams, combine the reflected light collected by the first focusing lens or the objective lens with the fixed-phase beam generated by the reflecting mirror, and form a light intensity interference result;
the detector measures the light intensity interference result;
The control module is arranged to receive the light intensity interference result and read the stored digital code at the storage site according to the corresponding relation between the light intensity interference result and the stored digital code.
8. The interferometry reading device of claim 7, wherein the detector is a photodetector, and a second focusing lens is disposed on a second optical axis between the beam splitter and the detector, the second focusing lens being configured to focus the result of the light intensity interference onto the photodetector; or the detector is an area array detector.
9. The interferometric reading device of claim 7, characterized in that a chromatic aberration compensating lens or objective lens identical to said first focusing lens or objective lens is arranged between said beam splitter and said mirror.
10. A zernike phase contrast micro-reading device for implementing the method for writing and interferometry reading coding information of a nano-writing optical disc according to claim 1, which is characterized in that it is used for reading a storage number on an optical disc to be tested, storage sites are sequentially arranged on a disc writing recording layer of the optical disc to be tested, the storage number is written on each storage site in the form of m recording points by a nano-information writing method, and the m recording points respectively correspond to m different optical path information after information writing;
The Zernike phase contrast microscopic reading device comprises a light path module and a control module, wherein the light path module comprises a first optical axis and a second optical axis which are perpendicularly intersected, a beam splitter is arranged at the intersection point of the first optical axis and the second optical axis, a laser, an annular diaphragm and the beam splitter are sequentially arranged along the first optical axis, and the optical disc to be detected, an objective lens, a phase plate, a focusing lens and a photoelectric detector are sequentially arranged along the second optical axis;
The laser is arranged to emit a collimated laser beam of a preset wavelength as a reading beam; the annular diaphragm is arranged to modulate the reading beam into an annular shape;
the beam splitter is configured to reflect and impinge the reading beam on an optical axis of an objective lens, and to transmit light collected by the objective lens;
The objective lens is arranged to focus and irradiate the reading light beam on the storage site to form a reading light beam spot with the same size as the storage site, one beam of the reading light beam is subjected to phase modulation by the recording site to form reflected light of the storage site, the other beam of the reading light beam is directly reflected to form annular mirror reflection light, and the reflected light of the storage site and the mirror reflection light are collected;
the phase plate is configured to phase modulate the mirrored light to produce a stationary phase light beam;
the focusing lens is configured to combine the reflected light and the fixed phase light beam to form a light intensity interference result;
The photoelectric detector is used for measuring the light intensity interference result;
the control module is arranged to receive the light intensity interference result and read the stored digital code at the storage site according to the corresponding relation between the light intensity interference result and the stored digital code.
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| US20090245068A1 (en) * | 2008-03-31 | 2009-10-01 | Panasonic Corporation | Optical pickup device and optical disc drive |
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