WO2006057121A1 - 磁気光学式空間光変調器 - Google Patents
磁気光学式空間光変調器 Download PDFInfo
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- WO2006057121A1 WO2006057121A1 PCT/JP2005/019077 JP2005019077W WO2006057121A1 WO 2006057121 A1 WO2006057121 A1 WO 2006057121A1 JP 2005019077 W JP2005019077 W JP 2005019077W WO 2006057121 A1 WO2006057121 A1 WO 2006057121A1
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- drive line
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- light modulator
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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
- G02F1/09—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 magneto-optical elements, e.g. exhibiting Faraday effect
Definitions
- the present invention relates to a magneto-optical spatial light modulator that utilizes the Faraday effect.
- a magneto-optical spatial light modulator is a magneto-optical device that spatially modulates the amplitude, phase, and polarization state of light using the Faraday effect of the magnetic film, and changes the magnetic direction of the magnetic film.
- a large number of independently controllable pixels (pixels) are arranged in the X and Y directions.
- a spatial light modulator with such a two-dimensional array of pixels can process information in parallel at high speed, so optical information processing systems, optical computing, projector TV, video hologram recording, optical volume recording, etc.
- research and development has been progressing as a key device to be realized.
- the spatial light modulator 10 is mainly composed of a magnetic film.
- X-side and Y-side drive lines are wired along each pixel 14.
- An X-side drive pulse current is supplied from the X-side drive unit 16 to the predetermined drive line on the X side
- a Y-side drive pulse current is supplied from the Y-side drive unit 18 to the predetermined drive line on the Y side.
- the operations of the X-side drive unit 16 and the Y-side drive unit 18 are controlled by the control unit 20.
- the magnetic fields generated by the drive pulse currents flowing through the selected X-side drive line and Y-side drive line are combined, and the magnetic field direction of each pixel is individually controlled by the combined magnetic field.
- FIG. 8 is an explanatory diagram of the basic operation. Only two pixels are drawn to simplify the drawing. Incident light that has passed through the first polarizer 22 and has become linearly polarized light enters each pixel 14 of the spatial light modulator. Incident light passes through the transparent substrate 24 and the magnetic film 12, is reflected by the metal film 28, and passes through the magnetic film 12 and the transparent substrate 24 again to be emitted. At this time, due to the Faraday effect of the magnetic film 12, the polarization direction of the light reflected by each pixel 14 is rotated by a predetermined angle.
- the force to reach the polarizer 30 of 2 If the polarization transmission plane is set to +45 degrees, the upper light rotated +45 degrees Faraday is transmitted (ON), but the lower light rotated 45 degrees Faraday is Shut off (OFF). In this way, by controlling the direction of the magnetic field applied to each pixel, the on / off of the reflected light by each pixel can be controlled.
- Each pixel in a spatial light modulator is actually not an individual device that is completely independent, but a magnetic film is grown on the entire surface of the substrate by the LPE method. This is a state in which the pixels are magnetically partitioned. This is because it is necessary to arrange each pixel very small and accurately.
- U.S. Pat. No. 5,473,466 discloses that a film pattern capable of oxidizing oxygen such as Si is formed in a region corresponding to a pixel on a magnetic garnet material, and the whole is heat-treated, thereby forming a Si film.
- a technique is disclosed in which a magnetic garnet material directly underneath is reduced and altered to form a large number of pixels that can be reversed in magnetization on a pixel-by-pixel basis.
- the polarization direction of the light passing through each pixel can be rotated by a predetermined angle due to the Faraday effect, and therefore the spatial direction can be selected by arbitrarily selecting the direction of the magnetic field in each pixel. Modulated light can be generated.
- FIG. 9A shows the drive line in a plan view
- FIG. 9B shows a cross section
- the X-side drive line (horizontal direction: indicated by a dotted line) 32 and the Y-side drive line (vertical direction: indicated by a solid line) 34 circulate on each pixel 14 along its periphery by 3Z4, respectively.
- Each pixel is wired so that a total of 6Z4 turns on the X and Y sides.
- a triangular figure indicates a terminal.
- the drive line having such a pattern concentrates the magnetic flux in the central portion of the pixel 14, so that a large reversal magnetic field is generated in the central portion of the pixel 14 (in FIG. 9C).
- the direction of the magnetic field is indicated by an arrow).
- the magnetic field is horizontal below the drive line of pixel 14. It turns in the direction and does not contribute to the magnetic reversal.
- a magnetic field component in the direction opposite to the inversion direction is generated around the pixel.
- a reverse magnetic field is generated in the gap between the pixel and the pixel.
- the current value must be increased for the magnetization reversal of the pixel, and a large amount of heat is generated by the resistance of the drive line, and the stability of the operation is impaired due to the high temperature of each pixel and the drive line. Occurs.
- the cross-sectional area of the drive line is inevitably reduced, the resistance is increased!]
- the amount of heat generation is further increased, and the manufacture becomes difficult.
- the narrowing of the pixel interval limits the shape of the drive line, and also limits the distribution of the applied magnetic field. Therefore, magnetic field leakage to pixels other than the target pixel can create an applied magnetic field distribution suitable for the magnetization reversal of the pixel by an induced magnetic field having a component opposite to the applied magnetic field generated inside the target pixel. In addition, it is extremely difficult to drive without malfunction by simply applying the drive pulse current (without using a bias magnetic field for assisting magnetic field reversal during driving).
- the problem to be solved by the present invention is to provide a drive line configuration capable of realizing a high-density spatial light modulator with a large number of pixels and a narrow pixel interval, and a relatively small drive pulse current.
- the magnetic field of the target pixel can be efficiently controlled by the magnetic field generated by the sensor, the amount of heat generated can be reduced, the operation stability can be improved, the pixel spacing can be narrowed, and the non-target pixel can be reduced.
- one embodiment of the present invention includes a magnetic film made of a magneto-optical material, and a pixel force that rotates a polarization direction by a Faraday effect in the magnetic film.
- a large number of two-dimensionally arranged in the X and Y directions in a state of being separated from each other, and the magnetic field direction of each pixel is individually controlled by a combined magnetic field generated by a drive current flowing through a drive line wired along each pixel.
- the magneto-optic spatial light modulator is configured so that all or part of the drive line is wired in the gap between the pixels, and the drive line wired in the gap is shared by adjacent pixels. did.
- both the X-side and Y-side drive lines extend in a straight line, and all of them are wired in the gap between the pixel and the pixel.
- the adjacent X side drive line and Z or adjacent Y side drive lines can be short-circuited at one end by two lines to form a loop!
- the drive lines on the X side and the heel side have a meandering shape that rotates around each pixel 3 to 4 times, and a part or all of them are wired in the gap between the pixels.
- the drive line on the X side is wired so that it passes over or near each pixel in the X direction and passes through the gap between the pixels in the ⁇ direction, and the drive line on the ⁇ side is in the ⁇ direction.
- it can be configured to be wired so as to pass over or near each pixel and in the X direction so as to pass through the gap between the pixels.
- one of the drive lines on the X side and the heel side extends in a straight line, and all of the drive lines are wired in the gap between the pixels and are short-circuited by two lines to form a loop.
- the other drive line passes through or near each pixel and is wired so as to reciprocate, or one drive line reciprocates around the pixels arranged at an angle of 45 degrees.
- the other drive line may be wired so as to reciprocate around the pixels arranged at an angle of 45 degrees.
- the gap between the pixels has a groove structure for magnetically separating the pixels, and all or part of the drive lines are embedded in the grooves. Togashi.
- a large number of pixels that rotate the polarization direction by the Faraday effect are two-dimensionally arranged in the X direction and the heel direction in a state of being separated from each other, and are wired along the pixels.
- the X-side drive line and The drive lines on the heel side are arranged in the X direction, and are arranged in the X direction and the heel direction, and extend straight on the periphery of the pixel (not in a folded shape or spiral shape).
- the drive line force on the X and ⁇ sides of each pixel is wired to surround the “well” shape and the target pixel is surrounded by the “well” shape.
- the direction of the generated magnetic field is the target image. It was a match to Ruyotsu at the center.
- two X-side drive lines and two heel-side drives arranged on both sides of the pixel Lines are paired and shorted at each end to form a loop.
- the drive lines on the X side and the Y side may have the same width over the entire length, but the wiring line in the vicinity of the intersection is partially extended toward the inside of the pixel. be able to.
- the outer edge side of the pixel is linear
- the inner side of the opposite pixel is uneven
- a narrow portion and a wide portion are formed
- the line width is between the narrow portion and the wide portion.
- a wiring pattern that gradually changes linearly or curvedly may be used.
- the wide part can be set 1.5 times wider than the narrow part.
- the pattern is such that corners are chamfered when viewed from a direction perpendicular to the main surface of the magneto-optical element portion.
- the X-side and Y-side drive lines have a narrow portion that covers 10-25% of one side of the pixel !, and a wide portion that covers 25-45% of the side of the pixel.
- a wiring pattern in which the driving lines on the X side and Y side seen at the direction force perpendicular to the main surface of the section match at the intersection can be obtained.
- FIG. 1 is an explanatory diagram showing an example of a drive line and a generated magnetic field in one embodiment of the present invention.
- FIG. 2 is a process explanatory view showing an example of a method for manufacturing a magneto-optical spatial light modulator according to an embodiment of the present invention.
- FIG. 3 is an explanatory view showing another example of a drive line in an embodiment of the present invention.
- FIG. 4 is an explanatory view showing an example of a magneto-optic spatial light modulator according to another embodiment of the present invention.
- FIG. 5 is a cross-sectional view of the magneto-optical spatial light modulator of FIG.
- FIG. 6 is an explanatory view showing another example of the magneto-optical spatial light modulator according to another embodiment of the present invention.
- FIG. 7 is an explanatory diagram showing an example of a magneto-optic spatial light modulator.
- FIG. 8 is an explanatory diagram of basic operations.
- FIG. 9 is an explanatory diagram showing an example of a drive line and a generated magnetic field in the prior art. Explanation of symbols
- the magneto-optic spatial light modulator can set the magnetic direction independently in the magnetic film (for example, a magnetic garnet single crystal film), and responds to the magnetic direction with respect to incident light by the Faraday effect.
- a number of pixels that rotate the polarization direction are two-dimensionally arranged in the X and Y directions in a state of being separated from each other, and the magnetic field generated by the drive current flowing through the drive line wired along each pixel
- the magnetization direction of each pixel is individually controlled by the combined magnetic field.
- all or part of the drive line is wired in the gap between the pixels, and the drive line wired in the gap is configured to be shared by adjacent pixels. is there.
- FIG. 1A and 1B show the plane pattern of the drive line.
- the X-side drive line 40 horizontal direction; indicated by a dotted line
- the Y-side drive line 42 vertical direction; indicated by a solid line
- the end of each drive line is pulled out independently and connected to terminals 44 and 46. Therefore, each drive line can be driven completely independently. This is the most basic pattern. Since there are few overlapping parts, effects such as a decrease in the height of the upper drive line and a decrease in resistance can be obtained.
- the drive line 40 on the X side (horizontal direction; indicated by a dotted line) and the drive line 42 on the Y side (vertical direction; indicated by a solid line) They extend in a straight line, and all of them are wired in the gap between the pixels 14 and 14.
- Adjacent X-side drive line 40 and adjacent Y-side drive line 42 are alternately short-circuited at one end by two lines to form a loop, and are drawn out and connected to terminals 44 and 46. . Therefore, each drive line is driven in pairs. Adjacent pixels cannot be reversed in the same direction at the same time, but the number of terminals can be halved.
- FIG. 1C shows an example of a drive configuration for the drive line configuration of FIG. 1B.
- Two X-side drive lines 40 and two Y-side drive lines 42 are connected at one end and energized.
- the pixel located at the intersection of the X-side drive line 40 and the Y-side drive line 42 (the target pixel indicated by the cross diagonal line in FIG. 1B) is selected, and the magnetic direction of the pixel is the X-side and Y-side.
- the magnetic field is saturated by the combined magnetic field generated by the drive pulse current and the direction of the magnetic field is reversed (indicated by the white arrow in Fig. 1C).
- the adjacent pixels do not coincide with the timing of energization by the X-side and Y-side drive lines, so they are not magnetically saturated and the magnetization direction remains the same.
- one pixel is surrounded by four drive lines, so that a uniform magnetic field acts on the pixel, and the magnetization direction can be controlled reliably.
- the reversal magnetic field at the center of the pixel is decreasing due to the spacing between the drive lines.
- the magnetic field component of the reversal magnetic field is increasing throughout the pixel, and the average magnetic field per volume inside the pixel. It was confirmed that it is more than twice the conventional configuration shown in Fig. 9C.
- the drive line configuration of the present invention it is possible to apply the reversal magnetic field more efficiently than in the conventional configuration, and the drive pulse current value can be reduced. Since power consumption is proportional to the square of the drive current, the amount of generated heat is greatly reduced, and heat generation can be further suppressed. Further, as shown in FIG. 1A and FIG. 1B, the drive line configuration of the present invention generally has a shorter drive line length than the conventional configuration. As a result, the resistance of the drive line is further reduced, and power consumption and temperature rise can be suppressed.
- the generated reversal direction magnetic field is generated uniformly and averagely within the pixel, so that the generated magnetic field is generated even when the drive line position deviates from the proper position. Fluctuation of the field component is small.
- the maximum position of the magnetic field component in the inversion direction is shifted from the center of the pixel, and the magnetic field component in the inversion direction is concentrated near the maximum position. ing. For this reason, the drive line position is shifted in the direction in which the position where the maximum magnetic field is generated moves toward the pixel end, and the inversion method that occurs inside the pixel when the position where the maximum magnetic field is generated exceeds the pixel end.
- the magnetic field component in the direction is greatly reduced.
- the magnetic field is generated in the direction opposite to the inversion direction at a position farther from the maximum position, the total of the magnetic field components in the inversion direction generated inside the pixel when the maximum position is shifted greatly fluctuates.
- the drive line configuration of the present invention can be manufactured more easily than the conventional configuration with a larger tolerance in the drive line installation.
- the drive line configuration of the present invention all or part of the drive line is disposed in the vicinity of the gap portion. Therefore, when the gap portion is a groove as shown in FIG. Can be embedded inside.
- the drive line is embedded, the place where the strongest magnetic field is generated moves inside the pixel, so that the reversal magnetic field generated in the pixel further increases.
- Fig. 1D shows the result of magnetic field analysis using this structure.
- Reference numeral 40 denotes a drive line. Since the magnetic field is generated uniformly in the reversal direction in the entire pixel, it is possible to generate a reversal magnetic field efficiently, and an average reversal magnetic field exceeding three times that of the conventional configuration can be obtained.
- the drive line configuration according to an embodiment of the present invention is different from the conventional configuration. Since the number of drive lines can be reduced, manufacturing is easy and the temperature rise during driving is small. In addition, since the reversal magnetic field can be applied to the pixel more efficiently, excellent current efficiency and operational stability can be obtained.
- FIG. 2 shows an example of a method for manufacturing a magneto-optical spatial light modulator.
- the magnetic film 12 is, for example, a Bi-substituted rare earth iron garnet film, and is formed on a GGG substrate by about 3 m by liquid phase epitaxial growth.
- illustration of the GGG substrate is omitted.
- 2A to 2D show the steps (A) to (D) correspond to the following explanation, and FIGS. 2E to 2G show the planar state in the intermediate steps.
- A1 film 50 is formed on the entire surface of the magnetic film 12 by sputtering or vapor deposition. Thereafter, a resist layer 52 is formed only in the pixel formation region.
- the A 1 film in the gap region between the pixels is removed by ion milling, and further ion milling is performed to form the groove 54.
- the grooves 54 are formed in a lattice shape in the vertical and horizontal directions except for the area of the pixel 14 (see B in FIG. 2).
- the outer periphery is also ion-milled to form a recess.
- the A1 film 50 remains in the region corresponding to the pixel 14 and becomes a light reflecting film.
- a Cu film is formed by sputtering, vapor deposition or plating.
- the drive line 40 on the X side may be made of Au, A1, etc. in addition to Cu.
- This drive line may also be made of Au, A1, etc. in addition to Cu.
- FIG. 3 is an explanatory diagram showing another example of a drive line configuration according to an embodiment of the present invention.
- the drive lines on the X side and Y side are meandering so that each pixel rotates 3Z4 rounds, passing through or near each pixel in the X direction, and pixels in the Y direction.
- the Y-side drive line passes through or near each pixel in the Y direction, and passes through the gap between the pixels in the X direction. Wired to This configuration can reduce the position of the upper drive line because there are few portions where the drive line overlaps vertically.
- the symmetry of the generated magnetic field is broken, but the reverse magnetic field is not generated in the gap between the pixels, and the generated magnetic field is strong because the number of drive lines per pixel is 6Z4. .
- the drive lines on the X side and the Y side have a meandering shape that goes around each pixel 3Z4 times, and all of them are wired in the gaps of the pixels.
- this configuration there are many portions where the drive lines overlap vertically. However, this defect can be eliminated if the gap between the pixels has a groove structure.
- the drive line on the X side extends in a straight line, and is all wired between the pixels, and is short-circuited by two lines to form a loop, and the Y side
- This drive line is routed so as to make a round trip in and around each pixel.
- This configuration uses different patterns for the upper and lower drive lines, but a strong magnetic field can be obtained because the number of drive line per pixel is 6Z4. This pattern is suitable for embedding drive lines.
- one drive line is wired so as to make one round reciprocation with respect to pixels arranged at an angle of 45 degrees, and the other drive line is arranged at an angle of -45 degrees. It is wired so as to make one round of a round trip with respect to the pixel that is being used.
- the length of the drive line differs from terminal to terminal, and adjacent pixels cannot be reversed simultaneously in the same direction, but the drive line per pixel has a larger number of turns (number of turns: 2).
- the generated magnetic field is almost uniform.
- the configuration in which the pixels are magnetically separated by a groove structure and the drive lines are accommodated in the grooves is preferable because the drive line pattern can be accommodated.
- the configurations shown in FIGS. 1A, 1B, and 3A since the upper and lower overlaps of the drive lines are small, for example, the magnetic separation between pixels using a groove structure is performed, and only the pixel region is single-crystallized by a selective growth method. Even a configuration such as this can be adequately accommodated.
- FIG. 4 is an explanatory view showing another embodiment of the magneto-optical spatial light modulator according to the present invention.
- the magnetic direction can be set independently of each other, and a number of microscopic elements that rotate the polarization direction in accordance with the magnetic direction by the Faraday effect.
- Pixels 14 are two-dimensionally arranged in the X direction (horizontal direction) and the Y direction (vertical direction) in a state of being separated from each other, and drive lines on the X side and the Y side wired along the pixel 14
- This is a structure in which the magnetic field direction of each pixel is individually controlled by a combined magnetic field generated by the drive current flowing through the.
- the drive line (horizontal direction) 32 on the X side and the drive line (vertical direction) 34 on the Y side are respectively on the periphery of the pixels arranged in the X direction and the pixels arranged in the Y direction.
- the X-side drive line 32 and the Y-side drive line 34 are arranged on each pixel 14 so that the outer edge makes a round trip of 1Z2 along the periphery of the pixel. Wire the pixels so that they make a total of one turn on the X and Y sides.
- the X-side and Y-side drive lines are wired, they are designed with the same line width throughout. Then, two X-side drive lines and two Y-side drive lines arranged on both sides of the pixel make a pair, and each is short-circuited at one end to form a loop.
- each drive line appears alternately on both sides of the pixel array area on the X and Y sides. Therefore, when one X-side drive line is selected, it goes around 1Z2 round-trip with respect to the pixels located below the X-side drive line. The same applies to the drive line on the Y side.
- the short-circuit portions are distributed and arranged in this way, the drive portions can be easily arranged even if the pixels and the pixel gaps are narrowed.
- the current I is flowing through the XI drive line and the Y1 drive line, the pixel at the position where they intersect becomes the target pixel, and the current I goes around the target pixel just once.
- FIG. 5 is a cross-sectional view thereof.
- the magnetic film 12 is, for example, a Bi-substituted rare earth iron garnet film, and is formed on the GGG substrate 24 by about 3 m by liquid phase epitaxial growth.
- A1 film is formed on the entire surface of the magnetic film 12 by sputtering or vapor deposition. Then A resist layer is formed only in the element forming region.
- the pixel size is, for example, a square of 16 m in length and width, and the pixel interval is set to 2 m. The number of pixels in the prototype was 16 x 16.
- the A1 film in the gap region between the pixels is removed by ion milling, and further ion milling is performed to form the groove 42. Accordingly, the trenches 42 are formed in a lattice shape in the vertical and horizontal directions except for the region of the pixels 14. The groove depth is 3 m. Then, anneal at 900 ° C. In the region corresponding to the pixel 14, the A1 film 40 remains, which becomes a light reflecting film.
- a Cu film is formed laterally along the outer edge of the pixel 14 by sputtering, vapor deposition, or plating, and the X-side drive line 32 is wired. To do.
- the drive line may be made of Au, A1, etc. in addition to Cu.
- a Cu film is formed in the vertical direction along the outer edge of the pixel 14 by a notching method, a vapor deposition method, a plating method, or the like. Wire the drive line 34 on the Y side. This drive line may also be made of Au, A1, etc. in addition to Cu.
- the X-side drive line 32 and the Y-side drive line 34 are formed on the pixel 14 so as to surround each pixel 14 in a "well" shape.
- a spatial light modulator is obtained.
- the direction of the current flowing through the drive lines on the X side and the Y side is applied to the target pixel in the same direction as the direction of the magnetic field generated by the current flowing through each drive line. Only by energizing the two drive lines (one loop) on the X side, the generated magnetic field cannot exceed the coercive force of the magnetic film, and the two drive lines (one loop) on the X side and Y
- Each current value is set so that magnetic saturation occurs only when the two drive lines (one loop) are energized simultaneously.
- incident light passes through the GGG substrate 24 and the magnetic film 12, is totally reflected by the A1 film 40 that performs the mirror function, and is again reflected by the magnetic film 12 and the GGG substrate 2. 4 is transmitted through.
- the light path is indicated by an arrow.
- incident light reciprocates the magnetic film 12 corresponding to a pixel, the polarization direction is rotated by the Faraday effect.
- both the X side drive line and the Y side drive line are positioned on the pixel. Since it is located closer to the center than the corner of the element), the magnetic flux density at the corner of the pixel is reduced. Since the reversal of the magnetic domain in the pixel generally starts with the corner force, the positional relationship between the pixel and the drive line makes the magnetic field of the pixel in a diagonal positional relationship with the target pixel due to magnetic field leakage. Inversion can be suppressed. In addition, since the magnetic current is inverted by causing the current to go around the target pixel once, the current value flowing through one drive line can be halved. ⁇ ⁇ inversion can be prevented.
- FIG. 6 is an explanatory diagram showing another example of the magneto-optic spatial light modulator according to the present embodiment, and shows a state in which the pixel array region is viewed in a plan view.
- the X-side drive line 52 and the Y-side drive line 54 surround each pixel 14 in a “well” shape, and the X-side drive line 52 and the Y-side drive line 54 are
- the outer edge side of the pixel 14 is linear, and the inner side of the opposite pixel is uneven to form a narrow portion and a wide portion, and the line width gradually increases linearly between the narrow portion and the wide portion.
- the wiring pattern changes.
- the pattern is a pattern in which the corners of the wide portion are chamfered when the pixel array region is viewed in plan (as shown in FIG. 6A).
- Each drive line is wired inside the pixel along the outer edge of the pixel.
- the X-side drive line 52 and the Y-side drive line 54 are in pairs, and are short-circuited at one end thereof to form a loop.
- the current I flows through the XI drive line and the Y1 drive line.
- the X-side drive line 52 is as shown in FIG. 3B
- the Y-side drive line 54 is as shown in FIG. 3C.
- the dimension is to cover the inner side of 10 to 25%
- the wide part is the dimension to cover the inner side of 25 to 45% of one side of the pixel.
- the wide part should be 1.5 times wider than the narrow part.
- the X-side drive line 52 and the Y-side drive line 54 are set to dimensions so that the corner chamfering pattern of the wide width portion just overlaps when the pixel array region is viewed in plan.
- the leakage magnetic field of two intersecting drive line forces is concentrated near the intersection of the drive lines.
- the crossing portion is set wide, the cross section of the wiring becomes large, and the magnetic flux density at the corner of the pixel is reduced.
- the wider drive line is located closer to the center than the corner of the pixel, the magnetic flux spreads and there is less local concentration (at the corner of the pixel). Since the reversal of magnetic domains in a pixel generally starts with a corner force, such a wide chamfer By making it non-turning, it is possible to suppress the reversal of the magnetic field of the pixel in a diagonal relationship with the target pixel due to magnetic field leakage.
- it is a narrow portion other than the corner of the pixel a magnetic field can be efficiently applied to the target pixel with a short magnetic path, and magnetization can be reversed with a small current.
- Spatial light modulators were fabricated by varying the X-side and Y-side drive line patterns (wide and narrow dimensions) and their operation was tested. As a result, when the pixel size is 16 m and the pixel interval is 2 ⁇ m, when the narrow width a is 4 ⁇ m, the bit error does not occur at all when the wide width b is 6 ⁇ m or more. was gotten. In addition, when the narrow width a was 2 m and the wide width b was 4 ⁇ m or more, good results were obtained in which no bit error occurred.
- the magneto-optical spatial light modulator As described in detail above, in the magneto-optical spatial light modulator according to one embodiment of the present invention, all or part of the drive line is wired in the gap between the pixels, and the gap Since the wired drive line can be shared by adjacent pixels, the drive line length can be greatly reduced. In addition, the drive line spacing is halved, making it easy to increase the cross-sectional area of the drive line, reducing the electrical resistance, increasing the surface area and reducing heat dissipation, and increasing the temperature per drive line. Can be suppressed. As a result, the overall amount of heat generation can be reduced, and manufacturing is facilitated. In addition, since the reversal magnetic field applied to the target pixel can be increased, a magneto-optic spatial light modulator with a small size, a large number of pixels, and high reliability can be realized.
- the drive lines on the X side and the Y side extend straight, and each pixel is removed from the center thereof, thereby forming a character of "well". Since the wiring is arranged so as to surround the pixel and the drive line is wired so as to pass over the peripheral edge of the pixel, the distance between the pixels can be reduced. In addition, since the direction of the magnetic field that generates each drive line force is configured to coincide with the center of the pixel, the necessary magnetic field effectively acts only on the target pixel, and unnecessary magnetic field is generated in pixels other than the target pixel. Inverting does not occur and the occurrence of bit rate errors can be reduced. Therefore, a large amount of information can be processed at high speed.
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JP2004306556A JP2006119337A (ja) | 2004-10-21 | 2004-10-21 | 磁気光学式空間光変調器 |
JP2004314488 | 2004-10-28 | ||
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JP2005179901A JP4596468B2 (ja) | 2004-10-28 | 2005-06-20 | 磁気光学式空間光変調器 |
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CN109643032A (zh) * | 2016-09-02 | 2019-04-16 | 马克斯·普朗克科学促进学会 | 磁光式光调制器 |
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JPS4999054A (ja) * | 1973-01-26 | 1974-09-19 | ||
US4550389A (en) * | 1983-08-15 | 1985-10-29 | Litton Systems, Inc. | Apparatus and method for switching a magnetic domain lens |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS4999054A (ja) * | 1973-01-26 | 1974-09-19 | ||
US4550389A (en) * | 1983-08-15 | 1985-10-29 | Litton Systems, Inc. | Apparatus and method for switching a magnetic domain lens |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109643032A (zh) * | 2016-09-02 | 2019-04-16 | 马克斯·普朗克科学促进学会 | 磁光式光调制器 |
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