JP4795974B2 - ホログラフィックデータストレージに使用するための書き込みヘッド - Google Patents
ホログラフィックデータストレージに使用するための書き込みヘッド Download PDFInfo
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Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/292—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection by controlled diffraction or phased-array beam steering
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/16—Processes or apparatus for producing holograms using Fourier transform
-
- 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
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G—PHYSICS
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/128—Modulators
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
- G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133565—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements inside the LC elements, i.e. between the cell substrates
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H2001/0208—Individual components other than the hologram
- G03H2001/0224—Active addressable light modulator, i.e. Spatial Light Modulator [SLM]
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2223/00—Optical components
- G03H2223/13—Phase mask
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Holo Graphy (AREA)
- Liquid Crystal (AREA)
Description
フーリエ面のDCブライト−スポットの問題は、波面を超えて固定された擬似ランダムな光学位相変化を課する位相マスクを光学系に導入することにより解決できることは当業者には周知である。しかしながら、位相マスク画像はSLM上に画像化される必要のあること及び位相マスク画像がSLMと非常に正確に整列される(マスク内の画素がSLM画像の画素と整列されること)必要のあることもまた当業者には認識されている(例えば、米国特許明細書第6281993号明細書の第1カラム第65行乃至第2カラム第4行、或いは、マリア−ピー.ベルナール(Maria−P.Bernal)、ジェフリー ダブリュ.バール(Geoffrey W.Burr)、ハンス コウファル(Hans Coufal)、ジョン エイ.ホフナグル(John A.Hoffnagle)、シー.マイケル ジェファーソン(C.Michael Jefferson)、ロジャー エム.マクファーレン(Roger M.Macfarlane)、ロバート エム.シェルビー(Robert M.Shelby)及びマニュエル クィンタニラ(Manuel Quintanilla)による「デジタルホログラフィックシステムの六段階位相マスクの影響の実験的研究(Experimental study of the effects of a six−level phase mask on a digital holographic system」(Applied Optics、第37巻、第2094−2101頁、1998年、当該技術文献は本明細書において参照により援用される)を参照されたい)。位相マスク及び該位相マスクに関連したリレー結像光学系は、ドライブの光学系にサイズと費用とを加えることになる。それは特に、マスク画像をSLMにミクロンのスケールにて整列させるという正確なオプトメカニクス技術が必要とされるからである。
本発明の別の態様は、ホログラフィックデータストレージシステムのための書き込みヘッドであって、該記書き込みヘッドは、空間光変調器と位相マスクとを含み、該空間光変調器は画素列に配置されており、該画素列を構成する画素の各々は該空間光変調器に指向する光を別々に変調することが可能であり、位相マスクは、該位相マスクを透過する光の位相を変更することが可能であり、かつ位相変化の強度は光が透過する位相マスクの特定の部分に依存する、書き込みヘッドに関する。位相マスクは空間光変調器の200μmの画素の範囲内に配置されている。
本発明の種々の付随的な特徴及び利点は以下に記載された更なる詳細な説明を考慮することにより当業者には明らかになるであろう。
図6は本発明の示唆に従うDMD装置100の一体的な部分として提供される位相マスクを示す。基板102はマイクロメカニカルミラー104の画素化アレイを含み、該ミラーは、周知のように、二つ以上の選択可能な方向のうちの一方に光を反射させるために制御され得る。従来のように、基板102はパッケージ化ハウジング104に取り付けられ、保護透過窓106により覆われた上方開口部を備えている。新規な様式においては、別の透過型窓108が、アレイ又はマイクロミラー104に近接した領域にて、基板に、接着剤110又はロウ付け若しくはフリットのようなその他適切な固定手段により取り付けられている。この透過型窓108は、貫通する光の位相を空間的に変更するために設けられた位相マスク112を含む。位相マスク110は必ずしも平坦化されている必要はない。それは、液晶の場合と異なり、位相マスク窓108の内面を平坦にする差し迫った理由がないからである。光は上方から、保護窓106及び位相マスク窓108を透過して、マイクロミラーのアレイで反射し、再び二つの窓106及び108を貫通する。理解されるように、仮に市販のDMD装置を購入して、そこに位相マスクを取り付けようと試みたとしたら、該位相マスクを保護窓106の外側に取り付けるか、あるいは幾分更に離れた位置に窓を配置する必要があるであろう。これにより画素面からかなり遠く離れてしまい、所望の結果が達成できないことになる。
Claims (14)
- ホログラフィックデータストレージシステムのための書き込みヘッドであって、前記書き込みヘッドは液晶空間光変調器を含み、
前記液晶空間光変調器は、変調器基板と、層状かつ透過性の窓と、前記変調器基板と前記層状かつ透過性の窓との間に挟持された液晶材料層と、位相マスクと、を含み、
前記変調器基板は画素列を含み、前記画素の各々は該液晶空間光変調器に指向する光を別々に変調することが可能であり、
前記位相マスクは、該位相マスクを透過する光の位相を変更することが可能であり、位相変化の強度は、光が透過する位相マスクの特定の部分に依存しており、
前記位相マスクは、同位相マスクが前記層状かつ透過性の窓の内面に設けられた状態にて同層状かつ透過性の窓に組み込まれており、前記内面は、前記液晶材料層に隣接している、書き込みヘッド。 - 前記液晶空間光変調器は強誘電性液晶空間光変調器である請求項1に記載の書き込みヘッド。
- 前記位相マスクは、多レベル表面を有する高屈折率材料の層と多レベル表面を有する低屈折率材料の層とを含み、前記二つの多レベル表面は互いに対面している請求項1に記載の書き込みヘッド。
- 前記液晶空間光変調器は、前記位相マスクと前記液晶材料層との間に導電性電極層を更に含む請求項3に記載の書き込みヘッド。
- 前記導電性電極層は、前記高屈折率材料の層の前記多レベル表面とは相対向する側に配置されている請求項4に記載の書き込みヘッド。
- 前記導電性電極層は、前記低屈折率材料の層の前記多レベル表面とは相対向する側に配置されている請求項4に記載の書き込みヘッド。
- 前記位相マスクと前記画素との間の間隙は200μm未満である請求項1に記載の書き込みヘッド。
- 前記位相マスクは、前記液晶空間光変調器の画素から距離d内にあり、ここでdはp2/λに等しく、かつpは前記液晶空間光変調器の画素のピッチであるとともにλは液晶空間光変調器に指向する光の波長である請求項1に記載の書き込みヘッド。
- 前記ホログラフィックデータストレージシステムは画像系を有し、前記位相マスクは、前記ホログラフィックデータストレージシステムの画像系が前記位相マスクと前記画素との両方を解像することを可能にするために、前記液晶空間光変調器の画素に十分に近接している請求項1に記載の書き込みヘッド。
- 前記位相マスクは画素化されていない請求項1に記載の書き込みヘッド。
- 前記位相マスクは前記画像系の前記画素の焦点深度内に配置されている請求項9に記載の書き込みヘッド。
- 前記変調器基板は集積回路バックプレートである、請求項1に記載の書き込みヘッド。
- 前記層状かつ透過性の窓は低屈折率材料の層を含み、前記低屈折率材料の層は平坦な面と多レベル面とを有し、前記平坦な面は前記層状かつ透過性の窓の外面を定義するとともに前記多レベル面は多レベル面を有する高屈折率材料の層に隣接しており、前記低屈折率材料の層の多レベル面と前記高屈折率材料の層の多レベル面とは互いに対面している、請求項1に記載の書き込みヘッド。
- 前記層状かつ透過性の窓は高屈折率材料の層を含み、前記高屈折率材料の層は平坦な面と多レベル面とを有し、前記平坦な面は前記層状かつ透過性の間の外面を定義するとともに前記多レベル面は多レベル面を有する低屈折率材料の層に隣接しており、前記高屈折率材料の層の多レベル面と前記低屈折率材料の層の多レベル面とは互いに対面している、請求項1に記載の書き込みヘッド。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US53962004P | 2004-01-27 | 2004-01-27 | |
US60/539,620 | 2004-01-27 | ||
US54073704P | 2004-01-30 | 2004-01-30 | |
US60/540,737 | 2004-01-30 | ||
PCT/US2005/002678 WO2005072396A2 (en) | 2004-01-27 | 2005-01-27 | Phase masks for use in holographic data storage |
Publications (2)
Publication Number | Publication Date |
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JP2007519980A JP2007519980A (ja) | 2007-07-19 |
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EP (1) | EP1751746A4 (ja) |
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JP4795974B2 (ja) | 2004-01-27 | 2011-10-19 | ディスプレイテック,インコーポレイテッド | ホログラフィックデータストレージに使用するための書き込みヘッド |
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JP2007025367A (ja) * | 2005-07-19 | 2007-02-01 | Sony Corp | ホログラム記録装置及びホログラム記録方法 |
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JP5236321B2 (ja) * | 2007-03-16 | 2013-07-17 | パナソニック株式会社 | ホログラム記録再生装置 |
US7986603B1 (en) * | 2007-09-29 | 2011-07-26 | Silicon Light Machines Corporation | Spatial light modulator for holographic data storage |
JP2009139587A (ja) * | 2007-12-05 | 2009-06-25 | Rohm Co Ltd | 光制御装置 |
TWI365363B (en) * | 2008-06-06 | 2012-06-01 | Univ Nat Chiao Tung | Spatial lilght modulator |
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Also Published As
Publication number | Publication date |
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WO2005072396A2 (en) | 2005-08-11 |
EP1751746A4 (en) | 2008-06-11 |
US20050207313A1 (en) | 2005-09-22 |
WO2005072396A3 (en) | 2006-12-28 |
US20100091631A1 (en) | 2010-04-15 |
US8107344B2 (en) | 2012-01-31 |
JP2007519980A (ja) | 2007-07-19 |
US7656768B2 (en) | 2010-02-02 |
EP1751746A2 (en) | 2007-02-14 |
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