CN100383861C - Optical memory - Google Patents
Optical memory Download PDFInfo
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- CN100383861C CN100383861C CNB2004100514482A CN200410051448A CN100383861C CN 100383861 C CN100383861 C CN 100383861C CN B2004100514482 A CNB2004100514482 A CN B2004100514482A CN 200410051448 A CN200410051448 A CN 200410051448A CN 100383861 C CN100383861 C CN 100383861C
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- transmitting device
- micropore
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Abstract
The present invention relates to an optical memory which comprises an optical emission and reception device and an optical transmission device, wherein the optical transmission device is provided with an input terminal and an output terminal. The optical emission and reception device is positioned at the input terminal of the optical transmission device. The output terminal is provided with a micro hole. The diameter of the micro hole is between five nanometers to seventy nanometers.
Description
[technical field]
The present invention relates to a kind of optical storage, particularly a kind of near field optic memory storage.
[background technology]
CD is the storage device of using always, is widely used owing to its capacity carries more greatly, easily.Common VCD CD capacity mostly is 640MB, and the DVD CD capacity can reach 5GB.Along with audio-visual works adopt the digital image data mode to write down and the large scale development of software gradually, also higher to the requirement of the storage capacity of CD.
The storage capacity of CD depends on the size of recording density, and the big more then CD of the more little then recording density of measuring point size has bigger capacity.But want the further measuring point size can be because the diffraction-limited of light be r 〉=0.66 λ/NA under far field condition, wherein r be the measuring point size, and λ is the optical wavelength of using, and NA be lens numerical aperture (Numerical Aperture, NA).Therefore the principle that need use the near field instead is carried out burning and is obtained higher recording density with the measuring point that obtains reduced size.
Near field optic is make measurement or record in the distance of use optical wavelength, because the fluctuation property of light does not also present, so near-field optical recording is a kind of new optical recording method that is not subjected to the diffraction limit restriction.Seeing also Fig. 1, is the synoptic diagram at the optical data memory system that disclosed Chinese patent application 99105101.7 discloses on March 29th, 2000 realizes with solid immersion lens.This optical memory system comprises that a light sends and receiving trap 20, one catoptrons 22, focusing objective len 24 and the refraction solid immersion lens 26 that supports by slide block 28, and it constitutes an optical focusing system.Its handled optical data carrier 18 comprises protective seam 183, substrate 181, and is arranged on the recording layer (not indicating) between protective seam 183 and the substrate 181.Slide block 28 utilizes aerodynamic principle to make solid immersion lens 26 floating, and forms the clearance of a thickness less than the optical wavelength of using between solid immersion lens 26 and optical storage medium 18.In this optical data memory system, near field generation district, form hot spot, generation district, described near field is positioned at a precalculated position on solid immersion lens 26 surfaces relative with optical storage medium 18.
Light sends and receiving trap 20 sends the light beam (not indicating) that diameter needles is optimized object lens 24.To focusing objective len 24 places, focusing objective len 24 is focused beam on solid immersion lens 26 with beam reflection for catoptron 22.When this clearance much smaller than the optical wavelength of using, as be λ/4 o'clock, the spot size that incides optical storage medium 18 can be less near the size of the hot spot that form near field generation district, therefore can be to high-density the recording layer of optical storage medium 18 be write and sense information.
But, store the restriction that reality still is subjected to diffraction limit with the near field optic that solid immersion lens is realized, the reduction of the measuring point size that it writes is limited, so its memory capacity is also limited.
[summary of the invention]
In order to overcome optical storage capacity smaller defect in the prior art, the invention provides the bigger optical storage of a kind of memory capacity.
The technical scheme that technical solution problem of the present invention is adopted is: a kind of optical storage is provided, it comprises that a light sends and receiving trap, one light transmitting device and an optical focusing system, this light transmitting device has an input end and an output terminal, this light transmission and receiving trap are positioned at the input end of this light transmitting device, this optical focusing system is positioned at the output of this light transmitting device, wherein, the wavelength of the light that described light sending device sends is between 200～300 nanometers or 400～760 nanometers, corresponding this output terminal has a micropore, when the wavelength of the light that described light sending device sends was between 200～300 nanometers, the diameter of this micropore was between 5 to 30 nanometers; When the wavelength of the light that described light sending device sends was between 400～760 nanometers, the diameter of this micropore was between 10 to 70 nanometers.
Compared to prior art, the advantage of optical storage of the present invention is that it uses the minimum micropore of a size to produce the near field light beam, the hot spot of this light beam only is subjected to the restriction of this pore size, when being used in combination with optical storage medium, can write and read information to the littler measuring point of size, therefore make optical storage medium have bigger memory capacity.
[description of drawings]
Fig. 1 is the synoptic diagram of prior art optical data memory system.
Fig. 2 is the structure of optical storage of the present invention and the synoptic diagram that is used in combination with optical storage medium thereof.
Fig. 3 is the section enlarged diagram of the sharp-pointed portion of optical fiber shown in Figure 2.
Fig. 4 is the diagrammatic cross-section of optical storage medium shown in Figure 2.
[embodiment]
Seeing also Fig. 2, is the synoptic diagram that optical storage of the present invention is used in combination with optical storage medium.Optical storage of the present invention comprises a light source 30, one optical fiber 31 and the solid immersion lens 36 that is supported by slide block 38.Optical storage medium 39 is used in combination with this device.Optical fiber 30 comprises a transport part 32 and a sharp-pointed portion 33, and this transport part 32 has an input end towards light source 30 (not indicating), and this sharp-pointed portion 33 has the output terminal (not indicating) towards solid immersion lens 36.This sharp-pointed portion 33 can draw or chemical corrosion forms by optical fiber is melted, and this slide block 38 can make solid immersion lens 36 floating by the mode identical with slide block 28 in the prior art.
Seeing also Fig. 3, is the section enlarged diagram of the 31 sharp-pointed portions 33 of optical fiber shown in Fig. 2.Optical fiber 31 has an inner core 330 and surrounding layer 333, draw or the sharp-pointed portion 33 of chemical corrosion becomes an inverted hollow round table body by melting, micropore 331 is positioned at output and towards solid immersion lens 36, one reflectance coating 332 is arranged on the inwall of sharp-pointed portion 33 surrounding layers 333, and this reflectance coating is the coating of silver or aluminium.
See also Fig. 2 and Fig. 3, described solid immersion lens 36 constitutes an optical focusing system, the light that light source 30 sends enters optical fiber 31 through input end, 32 are transferred to sharp-pointed portion 33 from the transport part, send and incide solid immersion lens 36 from output terminal, after its convergence, incide and realize on the optical storage medium 39 writing.The transmission of light in optical fiber 31 transport parts 32 is to be present in the inner core 330, and reflectance coating 332 can improve light utilization when transmitting in sharp-pointed portion 33, and light is finally from micropore 331 outgoing.
When adopting visible light source, promptly its wavelength that emits beam is between 400 to 760 nanometers time, and the diameter of this micropore 331 is controlled between 10 to 70 nanometers.The size of this micropore 331 is much smaller than the wavelength of light at this moment, and light produces near-field effect and do not have diffraction phenomena through micropore 331 outgoing meetings and takes place.When the light source that adopts shorter wavelength, when the LASER Light Source between 200 to 300 nanometers, can adopt the micropore 331 of smaller szie as wavelength of light, its controllable diameter between 5 to 30 nanometers to produce near-field effect.
Because near-field effect can be avoided the diffraction of light, therefore the hot spot that finally incides on the optical storage medium 39 by solid immersion lens 36 can be because of diffraction become greatly, thereby can have minimum size.Therefore recording density on the optical storage medium 39 can improve.
Seeing also Fig. 4, is the diagrammatic cross-section of the optical storage medium that is used in combination with optical storage of the present invention.Optical storage medium 39 comprises substrate 393, recording layer 392 and the protective clear layer 391 that is provided with in regular turn.The thickness of protective clear layer 391 is between 100 to 200 nanometers, can adopt glass or resin material manufacturing.Recording layer 392 thickness are between 10 to 20 nanometers, can adopt GeTeSb (germanium tellurium bismuth) material.When this optical storage medium 39 is used in combination with nanocomposite optical memory storage of the present invention, recording layer 392 can undergo phase transition in the irradiation that is subjected to minimum light beam, formation has the measuring point of reflection potential, and because the size of this measuring point is minimum, its recording density can reach the 100GB/ square inch.
In the above-described embodiment, this optical fiber 31 combines with light source 30, and it constitutes a nanometers light and finishes write step to optical storage medium 39.For the measuring point that is formed on the optical storage medium 39, because its size is minimum, so it is read and also need adopt corresponding nanocomposite optical reading device to finish.
This optical pickup device still adopts optical fiber 31, and with the micropore 331 record-orienteds point of its sharp-pointed portion 33, this moment this micropore 331 become a nano-probe with the light beam of receiving record point reflection and with this light beam by sharp-pointed portion 33 to transport part 32 transmission.This optical pickup device also comprises a photodetector, and it is positioned at after the transport part of optical fiber 31, will be converted into electric signal by the light signal that send the transport part and offers as uses such as displays.Compare with above-mentioned embodiment, optical fiber 31 still can be considered and has an input end and an output terminal, only its position transposing.
Optical storage often is required both can write optical storage medium, i.e. imprinting also can read the information of optical storage medium.This moment can compound use one light source and detector sends as a light and receiving trap to realize this two functions.
Because the micropore 331 of optical fiber 31 can produce the near field light of no diffraction phenomena, it can be used for the light processing of nano-scale, can be provided with a fiber array this moment, required all or part of optical fiber is wherein drawn or the mode of chemical corrosion forms the sharp-pointed portion with nanometer micropore by molten, and on the inwall of its surrounding layer, plate the reflection horizon.Adopt specific wavelength or this fiber array of more powerful light source irradiation, can on surface to be machined, form specific pattern.
Claims (8)
1. optical storage, it is used in combination with optical storage medium, this optical storage comprises that a light sends and receiving trap, one light transmitting device and an optical focusing system, this light transmitting device has an input end and an output terminal, this transmission and receiving trap are positioned at the input end of this light transmitting device, this optical focusing system is positioned at the output of this light transmitting device, it is characterized in that: the wavelength of the light that described light sending device sends is between 200～300 nanometers or 400～760 nanometers, corresponding this output terminal has a micropore, when the wavelength of the light that described light sending device sends was between 200～300 nanometers, the diameter of this micropore was between 5 to 30 nanometers; When the wavelength of the light that described light sending device sends was between 400～760 nanometers, the diameter of this micropore was between 10 to 70 nanometers.
2. optical storage as claimed in claim 1 is characterized in that: this light transmitting device is an optical fiber.
3. optical storage as claimed in claim 1 is characterized in that: this optical focusing system is a solid immersion lens, and this solid immersion lens is positioned at the output of described light transmitting device.
4. optical storage as claimed in claim 3 is characterized in that: also comprise a slide block, it swims on the optical storage medium solid immersion lens.
5. optical storage, it comprises a light source, one light transmitting device and an optical focusing system, this light transmitting device has an input end and an output terminal, this light source is positioned at the input end of this light transmitting device, this optical focusing system is positioned at the output of this light transmitting device, it is characterized in that: the wavelength of the light that this light source sends is between 200～300 nanometers or 400～760 nanometers, corresponding this output terminal has a micropore, when the wavelength of the light that described light source sends was between 200～300 nanometers, the diameter of this micropore was between 5 to 30 nanometers; When the wavelength of the light that described light source sends was between 400～760 nanometers, the diameter of this micropore was between 10 to 70 nanometers.
6. optical storage as claimed in claim 5 is characterized in that: this light transmitting device is an optical fiber.
7. optical storage, it comprises a detector, a light transmitting device and an optical focusing system, this light transmitting device has an input end and an output terminal, this detector is positioned at the input end of this light transmitting device, this optical focusing system is positioned at the output of this light transmitting device, it is characterized in that: this output terminal has a micropore, be used for the light of transmission wavelength between 200～300 nanometers or 400～760 nanometers, when described micropore was used for the light of transmission wavelength between 200～300 nanometers, the diameter of this micropore was between 5 to 30 nanometers; When described micropore was used for the light of transmission wavelength between 400～760 nanometers, the diameter of this micropore was between 10 to 70 nanometers.
8. optical storage as claimed in claim 7 is characterized in that: this light transmitting device is an optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100514482A CN100383861C (en) | 2004-09-09 | 2004-09-09 | Optical memory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100514482A CN100383861C (en) | 2004-09-09 | 2004-09-09 | Optical memory |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1746984A CN1746984A (en) | 2006-03-15 |
| CN100383861C true CN100383861C (en) | 2008-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100514482A Expired - Fee Related CN100383861C (en) | 2004-09-09 | 2004-09-09 | Optical memory |
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| Country | Link |
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| CN (1) | CN100383861C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114121090A (en) * | 2020-08-31 | 2022-03-01 | 华为技术有限公司 | Data read-write device and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1248763A (en) * | 1998-09-18 | 2000-03-29 | 三星电子株式会社 | Near-field optical memory medium and optical data memory system |
| CN1250538A (en) * | 1997-11-22 | 2000-04-12 | 三星电子株式会社 | Catadioptric optical system, optical pickup and optical disk drive employing the same, and optical disk |
| JP2001014716A (en) * | 1999-06-30 | 2001-01-19 | Ricoh Co Ltd | Fiber probe |
-
2004
- 2004-09-09 CN CNB2004100514482A patent/CN100383861C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1250538A (en) * | 1997-11-22 | 2000-04-12 | 三星电子株式会社 | Catadioptric optical system, optical pickup and optical disk drive employing the same, and optical disk |
| CN1248763A (en) * | 1998-09-18 | 2000-03-29 | 三星电子株式会社 | Near-field optical memory medium and optical data memory system |
| JP2001014716A (en) * | 1999-06-30 | 2001-01-19 | Ricoh Co Ltd | Fiber probe |
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| Publication number | Publication date |
|---|---|
| CN1746984A (en) | 2006-03-15 |
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