WO2004013847A1 - 光誘起表面レリーフに基づく情報記録方法 - Google Patents
光誘起表面レリーフに基づく情報記録方法 Download PDFInfo
- Publication number
- WO2004013847A1 WO2004013847A1 PCT/JP2003/009812 JP0309812W WO2004013847A1 WO 2004013847 A1 WO2004013847 A1 WO 2004013847A1 JP 0309812 W JP0309812 W JP 0309812W WO 2004013847 A1 WO2004013847 A1 WO 2004013847A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information recording
- light
- pattern
- surface relief
- thin film
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
- G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
- G06K1/126—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by photographic or thermographic registration
-
- 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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
-
- 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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00452—Recording involving bubble or bump forming
Definitions
- the present invention relates to a method and a medium for recording and reproducing information by irradiating light to a thin film surface of a polymer compound having an azobenzene structure to form an anisotropic uneven pattern.
- Non-Patent Documents 1 and 2 When a polymer thin film having an azobenzene moiety is irradiated with light, a phenomenon (light-induced surface relief) in which relief is formed on the surface (light-induced surface relief) has been attracting much interest since 1995. (See Non-Patent Documents 1 and 2 below). This phenomenon is caused by irradiating a thin film of a polymer compound containing an azobenzene structure with a light pattern, the surface of which responds to the intensity of light, and the molecules move from the strong light to the weak light. As a result, irregularities are formed.
- Non-Patent Document 1 discloses a rewritable hologram or optical diffraction grating that does not require a development process. Utilizing its reversible formation and the ability to accurately record and reproduce the beam shape and polarization state, it has been applied to high-density optical information recording methods.
- the present invention increases the information density when recording information by irradiating a thin film of a polymer compound having an azo'benzene structure with light to form an uneven pattern on the surface. This is done for the purpose of causing
- a thin film of azobenzene polymer is irradiated with a linearly polarized circular laser having a Gaussian spatial distribution—as shown in Fig. 1, a single central dent (pit) and a linearly polarized electric field
- a surface relief pattern is obtained that is characterized by two protrusions that are raised specifically in the direction of the vector.
- k concave parts and (k + 1) convex parts are alternately arranged on a straight line. The obtained surface relief pattern is obtained.
- FIG. 1 is a schematic diagram of pit creation by irradiating a convergent laser with one light beam.
- FIG. 2 is a schematic diagram of a pit row created by irradiating a periodic light pattern.
- FIG. 3 is a diagram showing an AFM image of a surface relief by a converged polarized beam.
- FIG. 4 is an explanatory diagram of a reading principle of the recording method.
- FIG. 5 is a diagram showing a relationship between a change in reflection (or transmission) intensity and a direction of unevenness due to rotation of the read light.
- FIG. 6 is a diagram showing a change in reflectance (transmittance) depending on the depth of a pit.
- FIG. 7 is a diagram showing the correspondence between the AFM image of the surface relief by the irradiation of the periodic light pattern, the surface relief depth, and the signal intensity.
- FIG. 8 is a diagram showing an optical system example (1) for generating a periodic light pattern.
- FIG. 9 is a diagram showing an example of an optical system (2) for generating a periodic light pattern.
- a surface relief pattern is formed, which is characterized by a convex portion that rises specifically in the direction of the electric field vector of linearly polarized light. Therefore, as shown in the schematic diagram in Fig. 4, the surface relief pattern whose symmetry axis is rotated by ⁇ is irradiated with readout light having a line width as narrow as the pit, and the transmitted light or reflected light is irradiated. Monitor.
- the absolute values of reflectance and transmittance are considered to change depending on the depth of the pits (see Fig. 6), so each can be distinguished by the reflectance (or transmittance) intensity. Therefore, assuming that the number of depth gradations is n, the number of information codes increases dramatically, as in nm .
- an elliptically (or rectangular) light pattern having a periodic light intensity distribution (ie, light and dark stripes) as shown in FIG. 2 is applied to the azozenzen polymer thin film, the thin film is shown in FIG. As a result, a surface relief pattern in which k concave portions and (k + 1) convex portions are alternately arranged in a straight line is obtained.
- An elliptical (or rectangular) light pattern having a periodic light intensity distribution as shown in FIG. 2 is, for example, an optical system through a photomask (FIG. 8) or It can be easily generated by an optical system using light interference (Fig. 9).
- the surface relief pattern obtained in this manner is subjected to a reading operation, as in the first embodiment, to obtain a function with respect to the rotation of the reading light.
- a reading operation as in the first embodiment
- the signal-to-noise ratio at this time is several times to several tens times higher than in the first embodiment due to the increase in the number of irregularities on the surface.
- the point that depth gradation multiplex recording is possible in addition to angle gradation multiplexing is the same as in the first embodiment, but also in this case, a better signal-to-noise ratio is obtained.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Optical Recording Or Reproduction (AREA)
- Holo Graphy (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Lasers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/523,009 US20050242324A1 (en) | 2002-08-02 | 2003-08-01 | Information recording method using light-induced surface relief |
DE10393007T DE10393007B4 (de) | 2002-08-02 | 2003-08-01 | Auf einem lichtinduzierten Oberflächenrelief basierende Datenspeichermethode |
AU2003252329A AU2003252329A1 (en) | 2002-08-02 | 2003-08-01 | Information recording method using light-induced surface relief |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002225453 | 2002-08-02 | ||
JP2002-225453 | 2002-08-02 | ||
JP2003-175822 | 2003-06-20 | ||
JP2003175822A JP4139892B2 (ja) | 2002-08-02 | 2003-06-20 | 光誘起表面レリーフに基づく情報記録方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004013847A1 true WO2004013847A1 (ja) | 2004-02-12 |
Family
ID=31497617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/009812 WO2004013847A1 (ja) | 2002-08-02 | 2003-08-01 | 光誘起表面レリーフに基づく情報記録方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050242324A1 (ja) |
JP (1) | JP4139892B2 (ja) |
AU (1) | AU2003252329A1 (ja) |
DE (1) | DE10393007B4 (ja) |
WO (1) | WO2004013847A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4937169B2 (ja) * | 2008-03-18 | 2012-05-23 | 株式会社東芝 | 情報記録媒体及びその製造方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0492212A (ja) * | 1990-08-06 | 1992-03-25 | Olympus Optical Co Ltd | 光学式多値記録および再生方式 |
JPH05197959A (ja) * | 1992-01-20 | 1993-08-06 | Pioneer Electron Corp | 記録媒体及びその情報書込・再生の各装置 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4974941A (en) * | 1989-03-08 | 1990-12-04 | Hercules Incorporated | Process of aligning and realigning liquid crystal media |
US5331626A (en) * | 1992-01-20 | 1994-07-19 | Pioneer Electronic Corporation | Recording medium and information recording and reproducing apparatus therefor |
JP4104718B2 (ja) * | 1997-04-11 | 2008-06-18 | 富士ゼロックス株式会社 | 光記録方法 |
JP3876281B2 (ja) * | 2000-08-31 | 2007-01-31 | 独立行政法人産業技術総合研究所 | 情報記録方法 |
US6909684B2 (en) * | 2001-03-22 | 2005-06-21 | Fuji Xerox Co., Ltd. | Optical recording medium, holographic recording and/or retrieval method and holographic recording and/or retrieval apparatus |
JP2003039400A (ja) * | 2001-08-03 | 2003-02-13 | Toyota Central Res & Dev Lab Inc | 微細光加工方法、微細光加工品及び光記録媒体 |
EP1432745B1 (de) * | 2001-09-27 | 2011-01-05 | Bayer MaterialScience AG | Wiederbeschreibbares optisches aufzeichnungsmaterial mit guter löslichkeit |
DE10223648A1 (de) * | 2001-09-27 | 2003-04-10 | Bayer Ag | Wiederbeschreibbares optisches Aufzeichnungsmaterial mit guter Löslichkeit |
JP3695398B2 (ja) * | 2002-01-30 | 2005-09-14 | 富士ゼロックス株式会社 | 光学式エンコーダ及びエンコーダ用スケール |
-
2003
- 2003-06-20 JP JP2003175822A patent/JP4139892B2/ja not_active Expired - Lifetime
- 2003-08-01 AU AU2003252329A patent/AU2003252329A1/en not_active Abandoned
- 2003-08-01 WO PCT/JP2003/009812 patent/WO2004013847A1/ja active Application Filing
- 2003-08-01 DE DE10393007T patent/DE10393007B4/de not_active Expired - Fee Related
- 2003-08-01 US US10/523,009 patent/US20050242324A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0492212A (ja) * | 1990-08-06 | 1992-03-25 | Olympus Optical Co Ltd | 光学式多値記録および再生方式 |
JPH05197959A (ja) * | 1992-01-20 | 1993-08-06 | Pioneer Electron Corp | 記録媒体及びその情報書込・再生の各装置 |
Also Published As
Publication number | Publication date |
---|---|
JP4139892B2 (ja) | 2008-08-27 |
JP2004127484A (ja) | 2004-04-22 |
DE10393007T5 (de) | 2005-08-04 |
AU2003252329A1 (en) | 2004-02-23 |
US20050242324A1 (en) | 2005-11-03 |
DE10393007B4 (de) | 2010-11-11 |
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