CN1588543A - Super resolution near field structure optic disc - Google Patents
Super resolution near field structure optic disc Download PDFInfo
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- CN1588543A CN1588543A CNA2004100527815A CN200410052781A CN1588543A CN 1588543 A CN1588543 A CN 1588543A CN A2004100527815 A CNA2004100527815 A CN A2004100527815A CN 200410052781 A CN200410052781 A CN 200410052781A CN 1588543 A CN1588543 A CN 1588543A
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Abstract
The invention is a super-resolution near-field CD, including a Ge-Sb-Te recording layer and a polycarbonate CD basal disc, and its characteristic: it is composed of a first protective layer, a nonlinear mask layer, a second protective layer, a recording layer and a third protective layer, which are sputtered in turn on the CD basal disc, where the nonlinear mask layer is a Sb layer, and the three protective layers are all composed of silicon nitride-silicon dioxide composite. It synthesizes the advantages of traditional super-resolution CD and near-field recording, the focused beam acts on the nonlinear mask layer to form a dynamic open-and-shut eyelet (its size less than diffraction limit) and after the focused beam passes through the eyelet, the size of facula is determined not by the diffraction limit but by the size of the eyelet, so it cannot be limited by the diffraction limit, thus largely reducing the size of a recording dot, increasing the storage density of the CD and having a very great practical prospect.
Description
Technical field:
The invention belongs to the near field of light technical field of memory, is a kind of ultra-resolution near-field structure CD.It integrates traditional super resolution optical disc and near-field recording, can dwindle measuring point, improves the storage density of CD greatly.
Background technology:
The device that the fast development of infotech requires to be used for information stores must possess superelevation storage density and ultrafast access rate, and this size of measuring point of CD that just requires to be used for information stores is more and more littler.But because the restriction of the numerical aperture of diffraction of light limit effect and optical head, even it also is several times relation that the reducing of spot size transferred to purple light from present blue light, and the increase of optical head numerical aperture is the greatly cost that adds with the distortion that reduces and cause owing to excentricity of depth of focus.Therefore it is very limited adopting the numerical aperture that increases optical head and reducing the size that optical maser wavelength reduces to read hot spot, so the research diameter is less than the record of the measuring point (super-resolution measuring point) of the diffraction of light limit with read and have very important using value and meaning.In advanced technology, adopt optical fiber or solid immersion lens (SIL) near field range at the enterprising line item of recording layer with read, see E.Betzig, J.Trautman, R.Wolfe, E.Gyorgy, P.Finn, M.Kryder, and C.Chang, Appl.Phys.Lett.61,142 (1992). can break through diffraction limit, see Fig. 1, compact disk structure comprises recording layer 01 and compact disc substrate 02, write down and read the time, distance between optical fiber probe 03 or solid immersion lens 04 and the recording layer will remain in the near field range, can write down and read the measuring point less than diffraction limit.But adopt above technology to have following shortcoming:
1, a little less than optical fiber probe is highly brittle, when controlling it and moving near field range (write down and read), be easy to damage, speed is very slow, and light intensity is very weak, is unfavorable for obtaining high signal to noise ratio (S/N ratio).
2, adopt solid immersion lens (SIL) though improved light intensity, but face the unmanageable problem of the distance of near field equally, keep the distance (tens nanometers are to tens nanometers) near field range between SIL and the recording layer, need very accurate Control and Feedback device, be difficult to practicability.
Summary of the invention
The problem to be solved in the present invention is to improve effectively the defective and the difficulty of above-mentioned prior art, a kind of ultra-resolution near-field structure CD is proposed, it can realize less than the record of the measuring point of diffraction limit in once record or erasable optical disk and read, and simple in structure, practicality.
Technical solution of the present invention is as follows:
A kind of ultra-resolution near-field structure CD, comprise gesbte recording layer and polycarbonate optical disks substrate, be characterised in that the sputter successively on compact disc substrate of its formation: first protective seam, non-linear mask layer, second protective seam, recording layer and the 3rd protective seam constitute, and described non-linear mask layer is an antimony; Described first protective seam, second protective seam and the 3rd protective seam all are that the compound substance of silicon nitride and silicon dioxide constitutes;
Described non-linear mask layer is a bismuth, and described first protective seam, second protective seam and the 3rd protective seam all are that the compound substance of zinc sulphide and silicon dioxide constitutes.
Described recording layer also can be silver indium antimony tellurium.
The thickness of described first protective seam is 120nm, and the thickness of second protective seam is 10～40nm, and the thickness of the 3rd protective seam is 130nm.
The thickness of described non-linear mask layer is antimony or the bismuth thin film of 10～50nm.
Described recording layer is thickness 15nm.
Technique effect of the present invention:
Focused beam acts on and forms a dynamic switch aperture (size is less than diffraction limit) on the non-linear mask layer, focused beam is by behind the aperture, spot size is to determine by the orifice size decision rather than by diffraction limit at the near field model, so can not be subjected to the restriction of diffraction limit, thereby can be in the measuring point that writes down on the recording layer less than diffraction limit.Compare with prior art; utilize second protective seam 3 that the distance between non-linear mask layer and the recording layer is remained in the near field range; can overcome the unmanageable problem of the distance of near field; simple in structure; and have compatible preferably with common video disc recording read-out system; can dwindle the measuring point size greatly, improve the storage density of CD, have very high practical application foreground.
Description of drawings:
Fig. 1 formerly adopts optical fiber probe or solid immersion lens to write down and read its corresponding compact disk structure figure in the technology.
Fig. 2 ultra-resolution near-field structure figure of the present invention and read schematic diagram
Fig. 3 adopts ultra-resolution near-field structure CD of the present invention, and Sb makes mask layer, SiN makes protective seam, the measuring point CCD figure that forms on the GeSbTe recording layer at recording power 12mW, record pulsewidth 200ns.
Fig. 4 adopts ultra-resolution near-field structure CD of the present invention, and Bi makes mask layer, (ZnS)
80(SiO
2)
20Make protective seam, the measuring point CCD figure that on the GeSbTe recording layer, forms at recording power 7mW, record pulsewidth 200ns.
Fig. 5 is the variation relation of measuring point size with protective seam 3 thickness
Fig. 6 is the variation relation of measuring point size with non-linear mask layer 2 thickness
Embodiment:
Super-resolution structure CD of the present invention as shown in Figure 2, the structure of super-resolution structure CD of the present invention is to be sputter successively on the compact disc substrate 11 of 0.6mm polycarbonate at thickness: protective seam 1, non-linear mask layer 2, protective seam 3, recording layer 4 and protective seam 5.First protective seam 1, second protective seam 3 and the 3rd protective seam 5 are used to prevent that non-linear mask layer 2 and recording layer 4 are subjected to heat damage or oxidation, and wherein second protective seam 3 also plays a part distance between control non-linear mask layer 2 and the recording layer 4 near field range.Non-linear mask layer 2 forms the dynamic switch aperture of size less than diffraction limit under laser action, near field range, spot size is determined by aperture, thereby form the measuring point less than diffraction limit on recording layer 4.
First protective seam 1, second protective seam 3 and the 3rd protective seam 5 in the mask of the present invention is by silicon nitride (SiN) or zinc sulphide: the compound substance of silicon dioxide=80: 20 is formed, and thickness is respectively 120nm, 10～40nm and 170nm; Non-linear mask layer 2 is Sb or the Bi film of thickness 10-50nm; Recording layer is Ge-Sb-Te (GeSbTe) or silver indium antimony tellurium (AgInSbTeSb) film of thickness 15nm.
Below in conjunction with example the present invention and effect thereof are described further:
The preparation process of ultra-resolution near-field structure CD is as follows: adopt magnetically controlled sputter method, sputtering pressure 1.0 * 10
-4Pa is sputter successively on the 0.6mm compact disc substrate 11 at thickness: first protective seam 1, non-linear mask layer 2, second protective seam 3, recording layer 4 and the 3rd protective seam 5.Wherein the thickness of first protective seam 1, second protective seam 3 and the 3rd protective seam 5 is respectively 120nm, 15～40nm and 130nm, and non-linear mask layer 3 is thick Sb of 10～50nm or Bi film, and recording layer is thick GeSbTe of 15nm or AgInSbTe.Optical disc recording apparatus adopts wavelength 650nm and numerical aperture 0.6, and the diffraction limit of measuring point is about λ/2NA ≈ 0.5 μ m.Laser is from compact disc substrate incident during record; be that laser beam is successively by protective seam (2), non-linear mask layer (3), protective seam (4), recording layer (5) and protective seam (6); light beam focuses on Sb or the last dynamic switch aperture that forms of Bi during record; focused beam is by behind the aperture; spot size forms the littler measuring point less than diffraction limit by the aperture decision less than diffraction limit on the GeSbTe record in the model of near field near field range.
(12mW, 200ns), employing Sb makes the non-linear mask layer, SiN makes protective seam under higher record condition.And under the situation of super-resolution structure CD of the present invention, see Fig. 3, and energy can well be converged to the center, and the measuring point size is 0.3～0.4 μ m, less than diffraction limit.
(7mW 200ns), adopts Bi to make mask layer, (ZnS) under lower record condition
80(SiO
2)
20Make protective seam, 0.2 μ m, at this moment measuring point also has been far smaller than diffraction limit.
Fig. 5 is the variation relation of measuring point size with protective seam 3 thickness, and the thickness of second protective seam 3 can be realized the measuring point less than diffraction limit in the scope of 10～40nm as can be seen.
Fig. 6 measuring point size is with the variation relation of non-linear mask layer 2 thickness, and the thickness of non-linear mask layer 2 can be realized the measuring point less than diffraction limit in the scope of 10～50nm as can be seen.
In sum, super-resolution structure CD of the present invention, can reduce the measuring point size, formation is less than the measuring point of diffraction limit, it can realize less than the record of the measuring point of diffraction limit in once record or erasable optical disk and read, and simple in structure, practicality, improve the storage density of CD, have very high practicability meaning.
Claims (7)
1, a kind of ultra-resolution near-field structure CD, comprise gesbte recording layer (4) and polycarbonate optical disks substrate (11), be characterised in that the sputter successively on compact disc substrate (11) of its formation: first protective seam (1), non-linear mask layer (2), second protective seam (3), recording layer (4) and the 3rd protective seam (5) constitute, and described non-linear mask layer (2) is an antimony; Described first protective seam (1), second protective seam (3) and the 3rd protective seam (5) all are that the compound substance of silicon nitride and silicon dioxide constitutes;
2, ultra-resolution near-field structure CD according to claim 1; it is characterized in that described non-linear mask layer (2) is a bismuth, described first protective seam (1), second protective seam (3) and the 3rd protective seam (5) all are that the compound substance of zinc sulphide and silicon dioxide constitutes.
3, ultra-resolution near-field structure CD according to claim 1 and 2 is characterized in that described recording layer (4) is a silver indium antimony tellurium.
4, ultra-resolution near-field structure CD according to claim 1 and 2, the thickness that it is characterized in that described first protective seam (1) is 120nm, and the thickness of second protective seam (3) is 10～40nm, and the thickness of the 3rd protective seam (5) is 130nm.
5, super-resolution structure CD according to claim 1 is characterized in that described non-linear mask layer (3) is antimony or the bismuth thin film of 10～50nm for thickness.
6, super-resolution structure CD according to claim 1 and 2 is characterized in that described recording layer (5) is thickness 15nm.
7, super-resolution structure CD according to claim 3, the thickness that it is characterized in that described recording layer (5) is 15nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100527815A CN1273975C (en) | 2004-07-13 | 2004-07-13 | Super resolution near field structure optic disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100527815A CN1273975C (en) | 2004-07-13 | 2004-07-13 | Super resolution near field structure optic disc |
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| Publication Number | Publication Date |
|---|---|
| CN1588543A true CN1588543A (en) | 2005-03-02 |
| CN1273975C CN1273975C (en) | 2006-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100527815A Expired - Fee Related CN1273975C (en) | 2004-07-13 | 2004-07-13 | Super resolution near field structure optic disc |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388374C (en) * | 2006-06-30 | 2008-05-14 | 中国科学院上海光学精密机械研究所 | One recording super-recognition near-field structure optical disk |
| CN101354900B (en) * | 2007-07-27 | 2011-11-23 | 国家纳米科学中心 | CDROM with ultra-resolution near-field structure |
| CN110515192A (en) * | 2019-09-17 | 2019-11-29 | 苏州睿仟科技有限公司 | The fast automatic scanning imaging system of super-resolution and method based on water immersion objective |
-
2004
- 2004-07-13 CN CNB2004100527815A patent/CN1273975C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388374C (en) * | 2006-06-30 | 2008-05-14 | 中国科学院上海光学精密机械研究所 | One recording super-recognition near-field structure optical disk |
| CN101354900B (en) * | 2007-07-27 | 2011-11-23 | 国家纳米科学中心 | CDROM with ultra-resolution near-field structure |
| CN110515192A (en) * | 2019-09-17 | 2019-11-29 | 苏州睿仟科技有限公司 | The fast automatic scanning imaging system of super-resolution and method based on water immersion objective |
| CN110515192B (en) * | 2019-09-17 | 2024-04-30 | 苏州睿仟科技有限公司 | Super-resolution rapid automatic scanning imaging system and method based on water immersion objective lens |
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| Publication number | Publication date |
|---|---|
| CN1273975C (en) | 2006-09-06 |
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