WO2013011957A1 - 近接場光デバイスの製造方法及び近接場光デバイス - Google Patents
近接場光デバイスの製造方法及び近接場光デバイス Download PDFInfo
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
- H01S5/343—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/34313—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser with a well layer having only As as V-compound, e.g. AlGaAs, InGaAs
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- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/041—Optical pumping
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3163—Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
- G11B9/12—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using near-field interactions; Record carriers therefor
- G11B9/14—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor using near-field interactions; Record carriers therefor using microscopic probe means, i.e. recording or reproducing by means directly associated with the tip of a microscopic electrical probe as used in Scanning Tunneling Microscopy [STM] or Atomic Force Microscopy [AFM] for inducing physical or electrical perturbations in a recording medium; Record carriers or media specially adapted for such transducing of information
- G11B9/1409—Heads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18386—Details of the emission surface for influencing the near- or far-field, e.g. a grating on the surface
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/18—Semiconductor lasers with special structural design for influencing the near- or far-field
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/0206—Substrates, e.g. growth, shape, material, removal or bonding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/0206—Substrates, e.g. growth, shape, material, removal or bonding
- H01S5/0207—Substrates having a special shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/0206—Substrates, e.g. growth, shape, material, removal or bonding
- H01S5/0215—Bonding to the substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/0206—Substrates, e.g. growth, shape, material, removal or bonding
- H01S5/0217—Removal of the substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/026—Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18305—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL] with emission through the substrate, i.e. bottom emission
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
- H01S5/341—Structures having reduced dimensionality, e.g. quantum wires
- H01S5/3412—Structures having reduced dimensionality, e.g. quantum wires quantum box or quantum dash
Definitions
- the present invention relates to a near-field light device device using a minute spot of near-field light such as HAMR (Heat Assisted Magnetic Recording), SNOM (Scanning Near Field Optical Microscope), etc. About.
- HAMR Heat Assisted Magnetic Recording
- SNOM Sccanning Near Field Optical Microscope
- Patent Literature 1 heat-assisted magnetic recording using near-field light as a light source for heating a magnetic recording medium
- Non-Patent Document 1 a manufacturing method (see Patent Document 2) that appropriately controls the size of quantum dots and a near-field concentrator using stacked quantum dots have been proposed (see Patent Document 3). Furthermore, an approach has been proposed in which near-field light is generated by a surface-emitting laser and high-density recording is possible with an optical head using the near-field light (Non-Patent Document 1).
- near-field light generating portion The size of the portion that generates near-field light of the near-field light device (hereinafter referred to as “near-field light generating portion”) is very small in the nano order. Accordingly, there is a problem that it is extremely difficult to mass-produce and form a near-field light device in which a light source that emits light to the near-field light generation unit and the near-field light generation unit are integrated.
- the present invention has been made in view of the above problems, for example, and an object and problem thereof is to provide a near-field light device manufacturing method and a near-field light device suitable for mass production.
- the near-field light manufacturing method of the present invention includes a step of forming a near-field light generating portion on one surface of a transparent substrate, a step of forming a light source, and the near-field light generating portion. Bonding the transparent substrate on which the light source is formed and the light source.
- a near-field light device of the present invention is disposed on a transparent substrate, a near-field light generating portion disposed on one surface of the transparent substrate, and the other surface of the transparent substrate.
- a light source is disposed on a transparent substrate, a near-field light generating portion disposed on one surface of the transparent substrate, and the other surface of the transparent substrate.
- FIG. 3 is a process cross-sectional view showing a process that follows the process of FIG. 2.
- FIG. 4 is a process cross-sectional view showing a process that follows the process of FIG. 3.
- FIG. 5 is a process cross-sectional view showing a process that follows the process of FIG. 4.
- FIG. 6 is a process cross-sectional view illustrating a process that follows the process of FIG. 5.
- FIG. 7 is a process cross-sectional view illustrating a process that follows the process in FIG. 6.
- FIG. 8 is a process cross-sectional view illustrating a process that follows the process in FIG. 7.
- FIG. 9 is a process cross-sectional view illustrating a process that follows the process in FIG. 8.
- FIG. 10 is a process cross-sectional view illustrating a process following the process in FIG. 9.
- FIG. 11 is a process cross-sectional view illustrating a process that follows the process of FIG. 10. It is process sectional drawing which shows 1 process of the manufacturing method of the near-field optical device which concerns on 2nd Embodiment.
- FIG. 13 is a process cross-sectional view illustrating a process continued from the process in FIG. 12.
- FIG. 14 is a process cross-sectional view illustrating a process that follows the process of FIG. 13.
- FIG. 13 is a process cross-sectional view illustrating a process that follows the process of FIG. 13.
- FIG. 15 is a process cross-sectional view illustrating a process following the process in FIG. 14.
- FIG. 16 is a process cross-sectional view illustrating a process following the process in FIG. 15.
- FIG. 17 is a process cross-sectional view illustrating a process that follows the process in FIG. 16. It is a figure which shows the structure of the 1st modification of the near-field light device which concerns on embodiment of this invention. It is a figure which shows the structure of the 1st modification of the near-field light device which concerns on embodiment of this invention. It is a figure which shows the structure of the 1st modification of the near-field light device which concerns on embodiment of this invention. It is a figure which shows the example which applied the near-field optical device which concerns on this invention to magnetic recording.
- FIG. 24 is a process cross-sectional view illustrating a process continued from the process in FIG. 23.
- FIG. 25 is a process cross-sectional view illustrating a process continued from the process in FIG. 24.
- FIG. 26 is a process cross-sectional view illustrating a process continued from the process in FIG. 25.
- FIG. 27 is a process cross-sectional view illustrating a process continued from the process in FIG. 26.
- FIG. 31 is a process cross-sectional view illustrating a process continued from the process in FIG. 30.
- FIG. 32 is a process cross-sectional view illustrating a process continued from the process in FIG. 31. It is a figure which shows the structure of the near-field light device which concerns on the modification of 4th Embodiment.
- FIG. 1 is a diagram showing a structure of a near-field light device according to the present embodiment.
- the near-field light device 100 includes: (i) a glass substrate 32, a stopper layer 31 stacked on the glass substrate 32, and a near-field light generating unit 10 stacked on the stopper layer 31. (Ii) an n-GaAs substrate 24, a light source 20 stacked on the n-GaAs substrate 24, a first electrode 41 formed on the light source 20, A member including a second electrode 42 formed on the n-GaAs substrate 24 is bonded to each other through a bonding layer 50.
- the n-GaAs substrate 24 may be a p-GaAs substrate.
- the light source 20 is a VCSEL (Vertical Cavity Surface Emitting LASER: vertical cavity surface emitting laser). VCSEL configurations are well known to those skilled in the art and will not be described in detail here.
- the light source 20 includes an upper mirror layer 22, a light emitting layer 21, and a lower mirror layer 23. During operation of the light source 20, power is supplied between the first electrode 41 and the second electrode 42.
- Near-field optical device manufacturing method Next, a manufacturing method of the near-field light device 100 according to the present embodiment will be described with reference to FIGS.
- a stopper layer 31 containing, for example, GaAs or the like is formed on the n-GaAs substrate 30, a stopper layer 31 containing, for example, GaAs or the like is formed.
- the GaAs substrate 11, the quantum dot layer 12, and the quantum dot layer 13 are stacked in this order on the stopper layer 31.
- the upper surface of the quantum dot layer 13 is fixed to the silicon substrate 62 with, for example, wax 61.
- the n-GaAs substrate 30 is removed by, for example, grinding or chemical etching (see FIG. 5).
- the glass substrate 32 is bonded to the lower surface of the stopper layer 31. Subsequently, the wax 61 and the silicon substrate 62 are removed (see FIG. 7). Next, as shown in FIG. 8, a metal layer 15 including, for example, gold (Au), copper (Cu), or the like is formed on the quantum dot layer 13.
- a predetermined mask is formed on the metal layer 15, and the metal layer 15 is etched using the formed mask, thereby forming the metal edge 14 as shown in FIG. .
- a predetermined mask is formed on the quantum dot layer 13 so as to cover the metal edge 14, and the quantum dot layer 13, the quantum dot layer 12, and the GaAs substrate 11 are etched using the formed mask. As shown in FIG. 10, the near-field light generating unit 10 is formed.
- the member provided with the near-field light generator 10 and the member provided with the light source 20 are bonded together.
- the member provided with the light source 20 is manufactured by a process different from the process of manufacturing the near-field light generating unit 10 shown in FIGS.
- FIGS. 1 A second embodiment of the near-field light device of the present invention will be described with reference to FIGS.
- the second embodiment is the same as the configuration of the first embodiment except that the manufacturing process of the near-field light device is partially different. Therefore, in the second embodiment, the description overlapping with that of the first embodiment is omitted, and the common portions in the drawings are denoted by the same reference numerals, and only the differences are basically illustrated in FIGS. The description will be given with reference.
- the quantum dot layer 12, and the quantum dot layer 13 are stacked in this order on the stopper layer 31 (see FIG. 3), as shown in FIG. A metal layer 15 is formed.
- a predetermined mask is formed on the metal layer 15, and the metal layer 15 is etched using the formed mask, thereby forming the metal edge 14 as shown in FIG. .
- a predetermined mask is formed on the quantum dot layer 13 so as to cover the metal edge 14, and the quantum dot layer 13, the quantum dot layer 12, and the GaAs substrate 11 are etched using the formed mask. As shown in FIG. 14, the near-field light generating unit 10 is formed.
- wax 61 or the like is applied to the upper surface of the stopper layer 31 so as to cover the near-field light generating unit 10, and the silicon substrate 61 is laminated on the wax 61 (see FIG. 15).
- the n-GaAs substrate 30 is removed by, for example, grinding or chemical etching (see FIG. 16).
- the glass substrate 32 is bonded to the lower surface of the stopper layer 31. Thereafter, the wax 61 and the silicon substrate 62 are removed.
- FIG. 18 is a diagram showing a structure of a first modification of the near-field light device according to the embodiment of the present invention.
- a recess is formed in a part of the n-GaAs substrate 25 of the near-field light device 110 according to the first modification. If comprised in this way, the light radiate
- FIG. 19 is a diagram showing a structure of a second modification of the near-field light device according to the embodiment of the present invention.
- a lens 33 is formed on the glass substrate 32 in particular. If comprised in this way, the light radiate
- the lens 33 is not limited to the convex lens type, and a Fresnel lens may be dug into the glass substrate 32.
- FIG. 20 is a diagram showing a structure of a third modification of the near-field light device according to the embodiment of the present invention.
- the near-field light generating unit 10 is stacked on the n-GaAs substrate 34 instead of the glass substrate.
- the n-GaAs substrate 34 is bonded to the n-GaAs substrate 26 via a bonding layer 52.
- FIGS. 21A and 21B are diagrams showing an example in which the near-field light device according to the present invention is applied to magnetic recording.
- FIG. 21 (a) illustrates the following contents.
- the ON / OFF of the light source 20 of the near-field light device 100 is controlled based on the recording signal corresponding to the information recorded on the recording medium 200, so that the metal end 14 ( Near field light 300 is generated around (see FIG. 1), or the generated near field light 300 disappears.
- the light source 20 is ON, energy moves from the metal end 14 to the minute spot on the recording medium 200 via the near-field light 300.
- the near-field light generating part 10 is made up to the height of the upper surface of the metal edge 14 with a coating layer 101 made of a dielectric material such as SiO 2 or a resin such as PMMA (Poly Methyl Methacrylate). Covered. If comprised in this way, it can prevent that this near field light generation part 10 is destroyed.
- the coating layer 101 may cover not only the near-field light generator 10 but also the surface emitting laser (light source 20).
- the coercive force of the minute spot is reduced by applying energy to the minute spot of the recording medium 200.
- Information is recorded on the recording medium 200 by applying a magnetic field to a minute spot with a reduced coercive force by a magnetic head (not shown).
- the metal edge 14 (see FIG. 1) included in the near-field light generating unit 10 and the recording medium 200 are less than a predetermined distance (for example, 20 nm or less), the metal edge 14 (see FIG. 1) and the metal of the recording medium 200 are used.
- the area facing the end 14 is integrated to generate the near-field light 300. Due to the integrated near-field light, the region itself facing the metal end 14 of the recording medium 200 generates heat, and the energy utilization efficiency is improved.
- the size (height direction) of the near-field light device can be adjusted by appropriately adjusting the thickness of the glass substrate 32.
- FIG. 22 is a diagram showing the structure of the near-field light device according to this embodiment.
- the near-field light device 140 includes an n-GaAs substrate 30, a lower electrode 44 formed on the lower surface of the n-GaAs substrate 30, and a light source 20 stacked on the upper surface of the n-GaAs substrate 30.
- the near-field light generating unit 10 stacked on the light source 20 and the upper electrode 43 formed on the upper surface of the light source 20 are configured.
- the n-GaAs substrate 30 may be a p-GaAs substrate.
- the near-field light generating unit 10 includes a GaAs substrate 11, a quantum dot layer 12 stacked on the GaAs substrate 11, a quantum dot layer 13 stacked on the quantum dot layer 12, and the quantum dot layer 13 and a metal end 14 formed on top of 13.
- the light source 20 includes an upper mirror layer 22, a light emitting layer 21, and a lower mirror layer 23. During operation of the light source 20, power is supplied between the upper electrode 43 and the lower electrode 44.
- Near-field optical device manufacturing method Next, a manufacturing method of the near-field light device 140 according to the present embodiment will be described with reference to FIGS.
- the lower mirror layer 23, the light emitting layer 21, and the upper mirror layer 22 are laminated in this order on the n-GaAs substrate 30.
- the GaAs substrate 11, the quantum dot layer 12, the quantum dot layer 13, and the metal layer 15 are laminated on the upper mirror layer 22 in this order.
- a predetermined mask is formed on the metal layer 15, and etching or the like is performed on the metal layer 15 using the formed mask, thereby forming the metal edge 14 as shown in FIG. .
- a predetermined mask is formed on the quantum dot layer 13 so as to cover the metal edge 14, and the quantum dot layer 13, the quantum dot layer 12, and the GaAs substrate 11 are etched using the formed mask. As shown in FIG. 26, the near-field light generating unit 10 is formed.
- a predetermined mask is formed on the upper mirror layer 22 so as to cover the near-field light generating unit 10, and the upper mirror layer 22, the light emitting layer 21, and the lower mirror layer 23 are formed using the formed mask. Etching or the like is performed to form the light source 20 as shown in FIG. Thereafter, the upper electrode 41 is formed on the upper mirror layer 22 (see FIG. 1).
- the lower electrode 44 is typically formed before the step shown in FIG.
- the upper electrode 43 and the lower electrode 44 are made of, for example, gold (Au) or copper (Cu).
- the near-field light device 140 in which the near-field light generator 10 and the light source 20 are integrally formed can be mass-produced relatively easily.
- n-GaAs substrate 30 may also be etched.
- etching or the like may be performed so that the upper mirror layer 22 is tapered as shown in FIG.
- the upper electrode 47 is formed after the oxide film 60 made of, for example, SiO 2 is formed on the upper surface of the light emitting layer 21.
- FIGS. 30 to 32 A fourth embodiment of the near-field light device of the present invention will be described with reference to FIGS.
- the fourth embodiment is the same as the third embodiment except that the configuration of the near-field light device is partially different. Accordingly, the description of the fourth embodiment that is the same as that of the third embodiment is omitted, and common portions in the drawings are denoted by the same reference numerals, and only the points that are basically different are shown in FIGS. 30 to 32. The description will be given with reference.
- a predetermined mask 53 is formed on the upper mirror layer 22 so as to cover the near-field light generating unit 10 and formed. Etching or the like is performed on the upper mirror layer 22 using the mask 53, so that the upper surface of the light emitting layer 21 is exposed as shown in FIG.
- an oxide film 60 made of, for example, SiO 2 is formed on the exposed upper surface of the light emitting layer 21. Subsequently, as shown in FIG. 31, a metal film 45 made of, for example, gold is formed on the formed oxide film 60.
- the metal film 45, the oxide film 60, the light emitting layer 21, and the lower mirror layer 23 are etched using a predetermined mask as shown in FIG. Then, the upper electrode 46 and the like are formed.
- the n-GaAs substrate 30 may be etched or the like as shown in FIG.
- FIG. 34 is a diagram showing a schematic structure of a near-field light device according to this embodiment.
- FIG. 34A is a perspective view of the near-field light device according to the present embodiment, and
- FIG. 34B is a cross-sectional view taken along the line AA ′ of FIG.
- the near-field light device 150 includes a light source 20, a transparent substrate 81 stacked on the light source 20, a near-field light generating unit 70 stacked on the transparent substrate 81, and the near-field. And a light shielding plate 82 that surrounds the light generating unit 70 and covers the upper surface of the transparent substrate 81.
- the transparent substrate 81 may be any substrate that can transmit at least light that can appropriately operate the near-field light generation unit 70 out of the light emitted from the light source 20.
- the transparent substrate 81 has a high light transmittance such as a glass substrate. It is not restricted to the board
- FIG. 35 is a diagram showing the structure of the near-field light generator according to this embodiment.
- the near-field light generator 70 includes a GaAs substrate 72, a GaAs buffer layer 73 stacked on the GaAs substrate 72, an InAs layer 74 stacked on the GaAs buffer layer 73, An InAs quantum dot 75 formed on the InAs layer 74, a GaAs layer 76 laminated so as to cover the InAs quantum dot 75, and a metal edge 77 formed on the GaAs layer 76. It is configured.
- the metal end 77 is preferably made of a metal (for example, gold (Au)) having an energy band capable of efficiently absorbing near-field light energy, but may be made of a metal other than gold or a semiconductor.
- the near-field light generating unit 70 is configured by GaAs and InAs.
- the near-field light generating unit may be configured by a light-transmitting material such as CuCl, GaN, or ZnO. .
- the light emitted from the light source 20 passes through the transparent substrate 81, the GaAs substrate 72, the GaAs buffer layer 73 and the InAs layer 74 and reaches the InAs quantum dots 75. Then, near-field light is generated around the InAs quantum dots 75. The energy of the generated near-field light moves to the metal end 77, and near-field light is generated around the metal end 77. The energy of the generated near-field light is obtained when the distance between the metal edge 77 and an object (not shown) becomes a distance that causes a near-field interaction (for example, 20 nm (nanometer) or less). Then, it moves from the metal edge 77 to a minute spot on the surface of the object.
- a distance that causes a near-field interaction for example, 20 nm (nanometer) or less.
- the diameter of the spot formed on the upper surface of the transparent substrate 81 (that is, the boundary surface between the transparent substrate 81 and the light shielding plate 82) of the light emitted from the light source 20 is assumed to be condensed by a lens or the like. It is several hundred nm to several ⁇ m ( ⁇ m).
- the size of the near-field light generating unit 70 is several tens nm to several hundreds nm. Then, light that is not incident on the near-field light generator 70 out of the light emitted from the light source 20 may leak from the vicinity of the near-field light generator 70.
- the light shielding plate 82 since the upper surface of the transparent substrate 81 is covered with the light shielding plate 82, the light emitted from the light source 20 that does not enter the near-field light generator 70 is the near-field light generator 70. It is possible to prevent leakage from the surroundings.
- a metal, a dielectric multilayer film (so-called dielectric mirror) or the like can be applied to the light shielding plate 82.
- FIG. 6 A sixth embodiment of the near-field light device of the present invention will be described with reference to FIG.
- the sixth embodiment is the same as the fifth embodiment except that the configuration of the near-field light device is partially different. Therefore, the description of the sixth embodiment that is the same as that of the fifth embodiment is omitted, and common portions in the drawing are denoted by the same reference numerals, and only the points that are basically different are described with reference to FIG. explain.
- FIG. 36 is a diagram showing a schematic structure of a near-field light device according to the present embodiment having the same purpose as FIG.
- FIG. 36A is a perspective view of the near-field light device according to the present embodiment
- FIG. 36B is a cross-sectional view taken along line BB ′ of FIG.
- the near-field light device 160 includes a light source 20, a transparent substrate 81 laminated on the light source 20, a near-field light generator 70 laminated on the transparent substrate 81, and the near-field.
- a horizontal light shielding plate 83 that surrounds the light generation unit 70 and covers the upper surface of the transparent substrate 81, and a vertical light shielding plate 84 that covers the side surface of the near-field light generation unit 70 are configured.
- a seventh embodiment of the near-field light device of the present invention will be described with reference to FIG.
- the seventh embodiment is the same as the configuration of the fifth embodiment except that the configuration of the near-field light device is partially different. Therefore, the description of the seventh embodiment that is the same as that of the fifth embodiment is omitted, and common portions in the drawing are denoted by the same reference numerals, and only fundamentally different points are described with reference to FIG. explain.
- FIG. 37 is a diagram showing a schematic structure of the near-field light device according to the present embodiment having the same purpose as in FIG.
- FIG. 37 (a) is a perspective view of the near-field light device according to the present embodiment
- FIG. 37 (b) is a cross-sectional view taken along the line CC ′ of FIG. 37 (a).
- the near-field light device 170 includes a light source 20, a transparent substrate 81 laminated on the light source 20, a near-field light generator 70 laminated on the transparent substrate 81, and the near-field. And a light shielding plate 85 that surrounds the light generating unit 70 and covers the upper surface of the transparent substrate 81.
- the thickness of the light shielding plate 85 is equal to or substantially equal to the distance from the bottom surface of the GaAs substrate 72 of the near-field light generating unit 70 to the top surface of the GaAs layer 76.
- FIG. 8 An eighth embodiment of the near-field light device of the present invention will be described with reference to FIG.
- the eighth embodiment is the same as the fifth embodiment except that the configuration of the near-field light device is partially different. Therefore, the description of the eighth embodiment that is the same as that of the fifth embodiment is omitted, and common portions in the drawing are denoted by the same reference numerals, and only fundamentally different points are described with reference to FIG. explain.
- FIG. 38 is a diagram showing a schematic structure of the near-field light device according to the present embodiment having the same purpose as in FIG.
- FIG. 38A is a perspective view of the near-field light device according to the present embodiment
- FIG. 38B is a cross-sectional view taken along the line DD ′ of FIG.
- the near-field light device 180 includes a light source 20, a transparent substrate 81 stacked on the light source 20, a near-field light generating unit 70 stacked on the transparent substrate 81, and the near-field. And a light shielding plate 86 that surrounds the light generation unit 70 and covers the upper surface of the transparent substrate 81.
- a minute groove 87 is formed between the near-field light generating unit 70 and the light shielding plate 86.
- the groove part 87 does not need to be formed intentionally, for example, may be formed accidentally during the manufacturing process of the said near field optical device 180.
- FIG. 39 is a diagram showing an example in which the near-field light device according to the present invention is applied to magnetic recording.
- ON / OFF of the light source 20 of the near-field light device 150 is controlled, so that the metal end 77 included in the near-field light generating unit 70 (FIG. 35).
- the near-field light 300 is generated around the reference), or the generated near-field light 300 disappears.
- the light source 20 is ON, energy moves from the metal edge 77 to the minute spot on the recording medium 200 via the near-field light 300.
- FIG. 39 illustrates the near-field light device 150 according to the fifth embodiment described above, but the near-field light device according to each of the sixth to eighth embodiments is also applicable.
- the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and the near-field light device with such a change
- the manufacturing method and the near-field optical device are also included in the technical scope of the present invention.
- DESCRIPTION OF SYMBOLS 10,70 ... Near-field light generation part 20 ... Light source, 21 ... Light emitting layer, 22 ... Upper mirror layer, 23 ... Lower mirror layer, 81 ... Transparent substrate, 82, 85, 86 ... Light-shielding plate, 83 ... Horizontal light-shielding plate 84 ... Vertical light shielding plate, 100, 110, 120, 130, 140, 150, 160, 170, 180 ... Near-field light device
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
- Semiconductor Lasers (AREA)
- Optical Head (AREA)
Abstract
Description
本発明の近接場光デバイスに係る第1実施形態について、図1乃至図11を参照して説明する。
先ず、本実施形態に係る近接場光デバイスの構成について、図1を参照して説明する。図1は、本実施形態に係る近接場光デバイスの構造を示す図である。
次に、本実施形態に係る近接場光デバイス100の製造方法について、図2乃至図11を参照して説明する。
本発明の近接場光デバイスに係る第2実施形態を、図12乃至図17を参照して説明する。第2実施形態では、近接場光デバイスの製造工程の一部異なる以外は、第1実施形態の構成と同様である。よって、第2実施形態について、第1実施形態と重複する説明を省略すると共に、図面上における共通箇所には同一符号を付して示し、基本的に異なる点についてのみ、図12乃至図17を参照して説明する。
ストッパ層31の上に、GaAs基板11、量子ドット層12及び量子ドット層13が、この順番で積層された後に(図3参照)、図12に示すように、該量子ドット層13の上に金属層15が形成される。
(第1変形例)
本発明の実施形態に係る近接場光デバイスの第1変形例について、図18を参照して説明する。図18は、本発明の実施形態に係る近接場光デバイスの第1変形例の構造を示す図である。
本発明の実施形態に係る近接場光デバイスの第2変形例について、図19を参照して説明する。図19は、本発明の実施形態に係る近接場光デバイスの第2変形例の構造を示す図である。
本発明の実施形態に係る近接場光デバイスの第3変形例について、図20を参照して説明する。図20は、本発明の実施形態に係る近接場光デバイスの第3変形例の構造を示す図である。
本発明に係る近接場光デバイスを、磁気ヘッドに適用した例を、図21を参照して説明する。図21(a)、(b)は、本発明に係る近接場光デバイスを磁気記録に応用した例を示す図である。
本発明の近接場光デバイスに係る第3実施形態について、図22乃至図27を参照して説明する。
先ず、本実施形態に係る近接場光デバイスの構成について、図22を参照して説明する。図22は、本実施形態に係る近接場光デバイスの構造を示す図である。
次に、本実施形態に係る近接場光デバイス140の製造方法について、図23乃至図27を参照して説明する。
(第1変形例)
図27に示した工程において、図28に示すように、n-GaAs基板30に対してもエッチング等が施されてもよい。
或いは、図27に示した工程において、図29に示すように、上部ミラー層22がテーパー状となるようにエッチング等が施されてもよい。この場合、発光層21の上面に、例えばSiO2等からなる酸化被膜60が形成された後に、上部電極47が形成される。
本発明の近接場光デバイスに係る第4実施形態を、図30乃至図32を参照して説明する。第4実施形態では、近接場光デバイスの構成が一部異なる以外は、第3実施形態の構成と同様である。よって、第4実施形態について、第3実施形態と重複する説明を省略すると共に、図面上における共通箇所には同一符号を付して示し、基本的に異なる点についてのみ、図30乃至図32を参照して説明する。
本実施形態では、近接場光発生部10が形成された後(図26参照)、近接場光発生部10を覆うように上部ミラー層22の上に所定のマスク53が形成され、該形成されたマスク53を用いて上部ミラー層22に対してエッチング等が施されることにより、図30に示すように、発光層21の上面が露出される。
図32に示した工程において、図33に示すように、n-GaAs基板30に対してもエッチング等が施されてもよい。
本発明の近接場光デバイスに係る第5実施形態について、図34及び図35を参照して説明する。図34は、本実施形態に係る近接場光デバイスの概略構造を示す図である。図34(a)は、本実施形態に係る近接場光デバイスの斜視図であり、図34(b)は、図34(a)のA-A´線断面図である。
本発明の近接場光デバイスに係る第6実施形態を、図36を参照して説明する。第6実施形態では、近接場光デバイスの構成が一部異なる以外は、第5実施形態の構成と同様である。よって、第6実施形態について、第5実施形態と重複する説明を省略すると共に、図面上における共通箇所には同一符号を付して示し、基本的に異なる点についてのみ、図36を参照して説明する。
本発明の近接場光デバイスに係る第7実施形態を、図37を参照して説明する。第7実施形態では、近接場光デバイスの構成が一部異なる以外は、第5実施形態の構成と同様である。よって、第7実施形態について、第5実施形態と重複する説明を省略すると共に、図面上における共通箇所には同一符号を付して示し、基本的に異なる点についてのみ、図37を参照して説明する。
本発明の近接場光デバイスに係る第8実施形態を、図38を参照して説明する。第8実施形態では、近接場光デバイスの構成が一部異なる以外は、第5実施形態の構成と同様である。よって、第8実施形態について、第5実施形態と重複する説明を省略すると共に、図面上における共通箇所には同一符号を付して示し、基本的に異なる点についてのみ、図38を参照して説明する。
本発明に係る近接場光デバイスを、磁気ヘッドに適用した例を、図39を参照して説明する。図39は、本発明に係る近接場光デバイスを磁気記録に応用した例を示す図である。
Claims (4)
- 透明基板の一方の面に近接場光発生部を形成するステップと、
光源を形成するステップと、
前記近接場光発生部が形成された前記透明基板と前記光源を貼り合わせるステップと、
を備えることを特徴とする近接場光デバイスの製造方法。 - 透明基板と、
前記透明基板の一方の面に配置された近接場光発生部と、
前記透明基板の他方の面に配置された光源と、
を備えたことを特徴とする近接場光デバイス。 - 前記近接場光発生部は、前記光源から出射された出射光に基づいて近接場光を発生し、
前記出射光が外部に漏れ出るのを抑制する遮光部を更に備えた
ことを特徴とする請求項2に記載の近接場光デバイス。 - 前記遮光部は、前記透明基板上に配置されていることを特徴とする請求項3に記載の近接場光デバイス。
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US14/131,015 US20140247849A1 (en) | 2011-07-15 | 2012-07-13 | Method of producing near-field light device, and near-field light device |
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JP2007293972A (ja) * | 2006-04-24 | 2007-11-08 | Sharp Corp | 磁気記録再生ヘッド、磁気記録再生装置及び磁気情報記録再生方法 |
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JP2001236685A (ja) * | 1999-12-14 | 2001-08-31 | Fuji Xerox Co Ltd | 光ヘッド、光磁気ヘッド、ディスク装置、および光ヘッドの製造方法 |
JP3882456B2 (ja) * | 2000-03-13 | 2007-02-14 | 株式会社日立製作所 | 近接場光プローブおよびそれを用いた近接場光学顕微鏡および光記録/再生装置 |
US6434180B1 (en) * | 2000-12-19 | 2002-08-13 | Lucent Technologies Inc. | Vertical cavity surface emitting laser (VCSEL) |
JP3962240B2 (ja) * | 2001-10-31 | 2007-08-22 | 株式会社日立製作所 | 近接場光プローブ集積半導体レーザ及びそれを用いた光記録装置 |
JP2003142783A (ja) * | 2001-11-08 | 2003-05-16 | Hitachi Ltd | 半導体レーザおよびそれを用いた光モジュール |
JP2007194378A (ja) * | 2006-01-18 | 2007-08-02 | National Institute Of Advanced Industrial & Technology | 量子ドットのエネルギー準位を制御した半導体素子およびそのための半導体素子の製造方法 |
JP4595007B2 (ja) * | 2008-07-23 | 2010-12-08 | 株式会社東芝 | 光導波路システム |
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JP2007293972A (ja) * | 2006-04-24 | 2007-11-08 | Sharp Corp | 磁気記録再生ヘッド、磁気記録再生装置及び磁気情報記録再生方法 |
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