CN118091818A - Super-configuration topology optical waveguide and augmented reality display device - Google Patents
Super-configuration topology optical waveguide and augmented reality display device Download PDFInfo
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Abstract
The invention discloses a super-configuration topological optical waveguide, which comprises a waveguide substrate, wherein a super-configuration coupling-in area and a topological-configuration coupling-out area are arranged on the waveguide substrate, and the super-configuration coupling-in area is provided with a coupling grating positioned on the surface of the waveguide substrate and a super-material layer covered on the coupling grating; the topological form coupling-out area is provided with a coupling-out grating, the coupling-out grating comprises a plurality of rows of grating units with coupling effect, and the forms of the grating units in each row are different. Through the structure, the super-configuration topological optical waveguide can improve the utilization rate of the whole light energy, the light transmission efficiency and the coupling-out efficiency, and the coupling-out uniformity is high. The invention also relates to an augmented reality display device.
Description
Technical Field
The invention relates to the technical field of augmented reality display, in particular to a super-configuration topological optical waveguide and an augmented reality display device.
Background
The augmented reality (Augmented Reality, AR) technology is a new technology for integrating real world information and virtual world information in a seamless mode, not only displays the real world information, but also displays the virtual information simultaneously, and the two information are mutually complemented and overlapped. In visual augmented reality, a user, using a head mounted display, recombines the real world with computer graphics so that the real world is visible around it.
Optical waveguides (also referred to simply as "optical waveguides") have been widely used in the field of augmented reality due to their total reflection optical characteristics, ultra-thin, surface-processable structures. Augmented reality displays based on optical waveguides have become the dominant display technology in the current industry. For example, holomens developed by microsoft forms a display window based on butterfly-type mydriasis conduction, and has large-view-field augmented reality display; augmented reality glasses developed by MAGIC LEAP in the united states of america realize color display based on a two-dimensional unidirectional conducting optical waveguide design, and multi-piece combination.
The augmented reality display based on the optical waveguide can be applied to vehicle-mounted head-up display besides the near-eye display field. At present, mainstream head-up display is based on the principle of geometrical optical space reflection, and has the defects of large front loading volume, short virtual image viewing distance, narrow eye movement range and the like. The optical waveguide-based augmented reality head-up display has the advantages of small front loading volume, long virtual image viewing distance, large eye movement range, large viewing angle and the like by increasing the surface area of the optical waveguide, and is a key display technology for intelligent driving and human-vehicle interaction.
However, most of the current augmented reality display technologies based on optical waveguides adopt the transmission concept of nanostructure diffraction, so that more waste is caused in the light transmission process, the overall coupling-out efficiency is low, and the uniformity of the coupling-out range is low.
The foregoing description is provided for general background information and does not necessarily constitute prior art.
Disclosure of Invention
The invention aims to provide a light source device which can improve the utilization rate of the whole light energy, the light transmission efficiency and the coupling-out efficiency and has high coupling-out uniformity.
The invention provides a super-configuration topological optical waveguide, which comprises a waveguide substrate, wherein a super-configuration coupling-in area and a topological-configuration coupling-out area are arranged on the waveguide substrate; the super-structure coupling-in area is provided with a coupling-in grating positioned on the surface of the waveguide substrate and a super-material layer covered on the coupling-in grating; the topological form coupling-out area is provided with a coupling-out grating, the coupling-out grating comprises a plurality of rows of grating units with coupling effect, and the forms of the grating units in each row are different.
Further, the metamaterial layer is a metal film layer.
Further, the metamaterial layer has a refractive index greater than 1.5.
Further, the thickness of the metamaterial layer is greater than or equal to 100 nanometers.
Further, the incident angle of the light ray in the super-structure coupling-in area ranges from-20 degrees to 20 degrees.
Further, the coupling-in grating and the coupling-out grating are positioned on the same side surface of the waveguide substrate; the super-structure coupling area adopts a transmission coupling mode or a reflection coupling mode to carry out light coupling.
Further, the grating units are in a nano lattice structure, each row of the grating units comprises a plurality of nano grating points, the structures of the nano grating points in the same row are the same, and the structures of the nano grating points in different rows are different.
Further, the grating units are in a nano lattice structure, each row of the grating units comprises a plurality of nano grating points, and the structures of the nano grating points are different.
Further, each row of the grating units extends along the x-direction of the waveguide substrate; the grating units form a two-dimensional array grating, the nano grating points of the grating units are arranged periodically and are provided with a first grating orientation M and a second grating orientation N which are arranged in a crossing mode, and an included angle between the first grating orientation M and the second grating orientation N is 20-160 degrees.
Further, the super-structure coupling-in area and the topological form coupling-out area are rectangular, the width direction and the length direction of the super-structure coupling-in area are consistent with those of the waveguide substrate, and the center line of the super-structure coupling-in area and the topological form coupling-out area in the y direction is coincident.
Further, the form of the grating unit comprises the shape, width and height of each nano grating point in each row of the grating unit; the coupling-out conduction efficiency of the nano grating points in the direction from the coupling-in area close to the super-structure body to the coupling-in area far away from the super-structure body increases gradually along the distance.
The invention also provides augmented reality display equipment comprising the super-configuration state topology optical waveguide.
The super-configuration topological optical waveguide provided by the invention has the advantages that the coupling-in grating and the metamaterial layer are utilized to improve the utilization rate of the whole light energy, so that high coupling-in conduction efficiency is generated, and the whole coupling-out efficiency is greatly improved; and the coupling-out uniformity of the whole surface is controlled point by matching with grating units with different morphologies in the topological morphology coupling-out area, so that the phenomenon of uneven light emission is effectively improved, and the coupling-out uniformity is high.
Drawings
FIG. 1 is a schematic diagram of a super-configuration topology optical waveguide in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the super-structure coupling-in region according to the preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a combination of image light source incidence and human eye observation of a super-configuration topology optical waveguide according to a preferred embodiment of the present invention;
FIG. 4 is a graph of positive and negative first order diffraction efficiencies when the superstructural coupling-in region is not provided with a metamaterial layer;
FIG. 5 is a graph of simulation efficiency of the super-structure coupling-in region shown in FIG. 3;
FIG. 6 is a schematic illustration of the effect of metamaterial layer thickness on diffraction efficiency;
FIG. 7 is a schematic illustration of the effect of the incident angle of light on diffraction efficiency at the super-structure coupling-in region;
FIG. 8 is a schematic illustration of the effect of the incident azimuth angle of light on diffraction efficiency at the superstructure coupling-in region;
FIG. 9 is a schematic diagram of another combination of image light source incidence and human eye observation of a super-configuration topology optical waveguide according to a preferred embodiment of the present invention;
FIG. 10a is a graph of simulation efficiency for the super-body coupling-in region of FIG. 9 without a metamaterial layer;
FIG. 10b is a graph of simulation efficiency of the super-structure coupling-in region shown in FIG. 9;
FIG. 11 is a schematic diagram of a topology outcoupling region of a super-topology optical waveguide according to a preferred embodiment of the present invention;
FIG. 12 is a schematic diagram illustrating the transmission of light in a topologically coupled-out region of a super-configured topological optical waveguide in accordance with a preferred embodiment of the present invention;
FIG. 13 is a schematic diagram of a topology outcoupling region of a super-topology optical waveguide according to a preferred embodiment of the present invention;
FIG. 14 is a schematic view of the light transmission of a super-configured topology optical waveguide according to a preferred embodiment of the present invention;
FIG. 15 is a schematic view of light transmission of a prior art optical waveguide;
FIG. 16 is a schematic illustration of structural points within the coupling-out range of a super-configured topology optical waveguide according to a preferred embodiment of the present invention;
FIG. 17 is a graph showing the coupling-out efficiency as a function of depth and duty cycle over the coupling-out range of a super-configured topology optical waveguide according to a preferred embodiment of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Fig. 1 is a schematic structural diagram of a super-configuration topological optical waveguide according to a preferred embodiment of the present invention, referring to fig. 1, the super-configuration topological optical waveguide according to a preferred embodiment of the present invention includes a waveguide substrate 10, a super-configuration coupling-in region 20 and a topology coupling-out region 30 disposed on the waveguide substrate 10.
The waveguide substrate 10 has a high transmittance in the visible light wavelength range, and may be made of glass, resin, or the like.
Fig. 2 is a schematic structural diagram of a super-structure coupling-in region according to a preferred embodiment of the present invention, wherein the super-structure coupling-in region 20 is provided with a coupling grating 21 located on the surface of the waveguide substrate 10 and a metamaterial layer 22 covering the coupling grating 21, and the coupling grating 21 and the metamaterial layer 22 are used for coupling in light, and simultaneously, the light conducted in the waveguide substrate 10 is efficiently improved.
The incoupling grating 21 is preferably a nanowire structure. The nanowire structure is a linear structure, can be in a regular rectangle or an irregular shape and is periodically arranged.
The x-direction is defined as the width direction of the waveguide substrate 10 in the drawing, the y-direction is defined as the length direction of the waveguide substrate 10 in the drawing, and the z-direction is defined as the thickness direction of the waveguide substrate 10. In this embodiment, the coupling-in grating 21 has one grating orientation (i.e., the channel direction of the grating), and in this embodiment, the grating orientation of the coupling-in grating 21 coincides with the x-direction, i.e., with the width direction of the waveguide substrate 10.
The metamaterial layer 22 is, for example, a metal film layer such as aluminum, titanium dioxide, or the like. The metamaterial layer 22 meanders over the surface coupled into the grating 21. In this embodiment, the refractive index of the metamaterial layer 22 is greater than 1.5. When incident light is incident on the super-structure coupling-in region 20 and diffracted, the diffracted light includes zero-order diffracted light, negative-order diffracted light, and positive-order diffracted light, as shown in fig. 2, after the light passes through the metamaterial layer 22, the diffraction efficiency of the positive-order diffracted light and the negative-order diffracted light is greatly improved, the diffraction efficiency of the zero-order diffracted light is basically achieved, and the metamaterial layer 22 can improve the diffraction efficiency of the positive-order diffracted light and the negative-order diffracted light, so that the conduction efficiency is greatly improved.
Fig. 3 is a schematic diagram showing a combination of incidence of an image light source and observation of human eyes of a super-configuration topology optical waveguide according to a preferred embodiment of the present invention, please refer to fig. 3, in which the coupling-in grating 21 and the coupling-out grating are located on the same side surface of the waveguide substrate 10, but not limited thereto. The image light source 40 may be incident from a structural surface (a surface provided with the coupling-in grating 21 and the coupling-out grating) of the super-structure topology optical waveguide, and the super-structure coupling-in region 20 performs light coupling in a transmission coupling manner, so that the human eye 50 is also observed from the structural surface.
Fig. 4 is a schematic diagram of the diffraction efficiency of the positive and negative orders when the super-structure coupling-in region is not provided with a super-material layer, as shown in fig. 4, if the super-structure coupling-in region 20 is provided with only the coupling-in grating 21 (no super-material layer 22 is provided), the diffraction efficiency is limited to the diffraction efficiency of the physical essential characteristics, and at a specific wavelength, the diffraction efficiency of the positive and negative orders of the diffracted light is very low.
Fig. 5 is a graph of simulated efficiency of the superstructure coupling-in region shown in fig. 3, and it can be seen from fig. 5 that the transmission efficiency of the positive and negative first order diffracted light is greater than 30% after light is coupled in through the superstructure coupling-in region 20 having the metamaterial layer 22.
Fig. 6 is a schematic view of the effect of the thickness of the metamaterial layer on the diffraction efficiency, and as shown in fig. 6, it can be seen that the thickness of the metamaterial layer 22 has a mutation above 100 nanometers (nm), the diffraction efficiency of the super-structure coupling-in region 22 is directly improved from very low to between 20% and 30%, and then the diffraction efficiency is stabilized in the interval along with the increase of the depth. That is, the thickness of metamaterial layer 22 is preferably greater than or equal to 100 nanometers.
Fig. 7 is a schematic diagram showing the effect of the incident angle of the light ray on the diffraction efficiency in the super-structure coupling-in region, as shown in fig. 7, in the range of the incident angle of plus or minus 20 degrees, the diffraction efficiency of the super-structure coupling-in region 22 is relatively balanced, and the surface has relatively good angle tolerance, so that the field of view in the range is supported. That is, the incident angle of the light (i.e., the light emitted from the image light source 40) in the super-structure coupling-in region 20 is preferably in the range of-20 degrees to 20 degrees.
Fig. 8 is a schematic view showing the effect of the incident azimuth angle of the light on the diffraction efficiency of the super-structure coupling-in region, as shown in fig. 8, the change of the efficiency is consistent between 20% -40% along with the change of the azimuth angle from 0 degrees to 360 degrees, that is, the effect of the image light source 40 on the diffraction efficiency of the super-structure coupling-in region 20 is not great regardless of the incident azimuth angle, and the super-structure coupling-in region 20 has wide azimuth angle tolerance.
In another embodiment of the present invention, the incident light may not be on the same side as the viewing direction. Specifically, fig. 9 is a schematic diagram of another combination of incidence of an image light source of a super-configuration topological optical waveguide and observation of human eyes according to a preferred embodiment of the present invention, as shown in fig. 9, in which the coupling-in grating 21 and the coupling-out grating are located on the same side surface of the waveguide substrate 10, when the image light source 40 is incident on the super-configuration coupling-in region 20 from the non-structural surface (the surface where the coupling-in grating 21 is not disposed) of the super-configuration topological optical waveguide, light is reflected and diffracted by the super-configuration coupling-in region 20, that is, the super-configuration coupling-in region 20 performs light coupling by adopting a reflective coupling manner to generate the conducted light, and the human eyes 50 can observe from the structural surface.
Fig. 10a is a simulation efficiency chart of the super-structure coupling region shown in fig. 9 when no metamaterial layer is disposed, fig. 10b is a simulation efficiency chart of the super-structure coupling region shown in fig. 9, please refer to fig. 10a and fig. 10b together, light is coupled in the super-structure coupling region 20 by the reflective coupling method shown in fig. 9, and the reflective first order diffraction efficiency is lower when the coupling grating 21 is of a pure nano structure, has a period of 433nm, a duty ratio of 0.7 and a depth of 230nm at an incident wavelength of 520nm, and the metamaterial layer 22 is not disposed in fig. 10 a; in fig. 10b, when the metamaterial layer 22 (e.g. 40 nm) is disposed, the reflection type first order diffraction efficiency can be improved to 30% compared to fig. 10a, and the efficiency can be improved by approximately 3 times compared to the case where the metamaterial layer 22 is not disposed.
The topologically outcoupling area 30 is used for outcoupling light. The topological form coupling-out region 30 is provided with a coupling-out grating, the coupling-out grating comprises a plurality of rows of grating units 31 with coupling effect, and the forms of the grating units 31 in each row are different, specifically, the structural parameters such as shape, width, height and the like are different.
The grating unit 31 may be a nanowire structure or a nanolattice structure. The nanowire structure is a linear structure, can be in a regular rectangle or an irregular shape and is periodically arranged. The single unit of the nano lattice structure can be in any regular or irregular shape such as a cylinder, a square column, a trapezoid column and the like, and is also periodically arranged. Can be prepared by adopting holographic interference technology, photoetching technology or nano-imprinting technology. The grating unit 31 is preferably a nano-lattice structure.
Fig. 11 is a schematic structural diagram of a topology coupling-out region of a super-topology optical waveguide according to a preferred embodiment of the present invention, in which each row of grating units 31 has a nano-lattice structure. Each row of grating units 31 includes a plurality of nano-grating points 311, and the structures of the nano-grating points 311 in the same row are the same, and since the structures of each row of grating units 31 are different, the structures of the nano-grating points 311 in different rows are different.
In another embodiment of the present invention, the structure of each nano-grating dot 311 in the topologically coupled-out region 30 is different, that is, not only the structures of the nano-grating dots 311 in different rows are different, but also the structures of the nano-grating dots 311 in the same row are different. It is also understood how many nanograting dots 311 are coupled out of the grating and how many morphologies are present.
Further, each row of grating units 31 extends along the x-direction (i.e., width direction) of the waveguide substrate 10. The plurality of rows of grating units 31 form a two-dimensional array grating, and the nano grating points 311 of the plurality of rows of grating units 31 are arranged in a periodic arrangement and have a first grating orientation M and a second grating orientation N which are arranged in a crossing manner.
Further, the angle between the first grating orientation M and the second grating orientation N is 20 ° to 160 °. Specifically, for example, the x direction of the first grating orientation M forms an angle of 120 °, and the second grating orientation N forms an angle of 60 ° with the x direction.
The shape of the super-structure coupling-in region 20, the topologically-shaped coupling-out region 30 may be circular, rectangular, tapered or otherwise adapted to the shape of the waveguide substrate 10. In this embodiment, the super-structure coupling-in region 20 and the topology coupling-out region 30 are rectangular, the width direction and the length direction are consistent with those of the waveguide substrate 10, and the center lines of the super-structure coupling-in region 20 and the topology coupling-out region 30 in the y direction are coincident.
Fig. 12 is a schematic diagram of a transmission process of light in a topological coupling-out region in a super-configured topological optical waveguide according to a preferred embodiment of the present invention, please refer to fig. 11 and 12 together, after the image light is coupled in through the super-configured coupling-in region 20, the image light is transmitted toward the topological coupling-out region 30, the light sequentially propagates in the topological coupling-out region 30 from the direction close to the super-configured coupling-in region 20 to the direction far away from the super-configured coupling-in region 20, the coupling-out grating of the topological coupling-out region 30 is in a nano lattice structure, the light transmitted through the coupling-in is inclined into each row of grating units 31 at a certain angle, each nano grating point 31 in each row of grating units 31 has a multidirectional diffusion light in the optical waveguide, including a left coupling-out, a right coupling-out and a central coupling-out, and a "topological" structure is formed between the light and the nano grating points 311 in the coupling-out transmission process of each nano grating point 31, and the light continuously diffuses in a multidirectional direction in a set direction, thereby realizing a pupil expansion and transmission function.
Since the structures of the nano-grating dots 311 for each row of the grating units 31 are different. By adjusting the structure of the nano-grating points 311 in each row of grating units 31, the total energy of the light coupled out by each row of nano-grating points 311 can be adjusted, and the uniformity of the light output in the whole coupling-out range is ensured.
Specifically, fig. 13 is a schematic structural diagram of a topology outcoupling region of a super-topology optical waveguide according to a preferred embodiment of the present invention. Referring to fig. 13, in the entire range of the topological form coupling-out region 30, the form of each row of grating units 31 is optimally controlled for the purpose of point-by-point efficiency control, specifically including the form, width, height and other parameters of each nano-grating point 311 in each row of grating units 31, so that the structures of the nano-grating points 311 in each row of grating units 31 are different, and finally, the coupling-out conduction efficiency of the nano-grating points 311 in the y direction from the direction close to the super-structure coupling-in region 20 to the direction far from the super-structure coupling-in region 20 increases according to the distance, that is, the coupling-out conduction efficiency of the nano-grating points 311 farther from the super-structure coupling-in region 20 is higher, and the coupling-out conduction efficiency of the nano-grating points 311 closer to the super-structure coupling-in region 20 is lower, and the increasing change may be uniform or nonuniform.
FIG. 14 is a schematic diagram of the light transmission of a super-configured topology optical waveguide according to a preferred embodiment of the present invention. It can be seen that assuming a different topology design at abc and a greater coupling-out conduction efficiency at c than at b, the coupling-out conduction efficiency at b is greater than at a. When the light passes through the abc three places, the coupling-out efficiency of the light can be controlled point by point, so that the coupling-out uniformity of the light in the z direction is achieved.
Fig. 15 is a schematic diagram showing light transmission of a conventional optical waveguide. When the structure of each row of grating elements in the coupling-out region 30 'is the same, it can be seen that light is coupled in via the coupling-in region 20', and that part of the light is coupled out and part of the light continues to be conducted in the waveguide, irrespective of whether the coupling-in region 20 'is provided with the metamaterial layer 22 or not, and is conducted in the waveguide, while passing through the coupling-out region 30'. However, it is known that if the coupling-out structure is not controlled point by point, the total energy of the light coupled out in the z direction is reduced by the distance each time, which may cause uneven efficiency of the coupling-out region (high conduction efficiency near the coupling-in region 20', low conduction efficiency far from the coupling-in region 20').
Fig. 16 is a schematic diagram of structural points within the coupling-out range of the super-configured topology optical waveguide according to the preferred embodiment of the present invention. In practice, by controlling the four parameters abcd (a is the grating period, b is the distance between two adjacent nano grating points 311, cd is the morphological parameters of the nano grating points 311 (such as the short side and the long side of the rectangular grating structure, and when the nano grating points 311 are other structures, the morphological parameters have different definitions)), the point-by-point accurate efficiency modulation can be realized, so as to realize the uniformity of the coupling efficiency.
FIG. 17 is a graph showing the coupling-out efficiency as a function of depth and duty cycle over the coupling-out range of a super-configured topology optical waveguide according to a preferred embodiment of the present invention. Wherein, the setting period is 433nm, the incident wave is changed from 520nm, the duty ratio of the long side is 0.4-1.4, the short side is 0.6 times of the long side size, and the depth is 10-800 nm. From the simulation graph, it can be seen that by modulating the duty cycle or depth of the long side (i.e. the height of the nano grating point 311), a wide range of variation of the coupling efficiency can be realized, thereby providing a method for accurately regulating and controlling the uniformity.
The invention also relates to augmented reality display equipment comprising the super-configuration state topology optical waveguide. Other structures of augmented reality display devices are well known to those skilled in the art and will not be described in detail herein.
The beneficial effects are that: the super-configuration topological optical waveguide is characterized in that a super-configuration coupling-in area and a topological-configuration coupling-out area are arranged on a waveguide substrate; the super-structure coupling-in area is provided with a coupling-in grating positioned on the surface of the waveguide substrate and a super-material layer covered on the coupling-in grating; the topological form coupling-out area is provided with a coupling-out grating, the coupling-out grating comprises a plurality of rows of grating units with coupling effect, and the forms of the grating units in each row are different. The invention utilizes the coupling-in grating and the metamaterial layer to improve the utilization rate of the whole light energy, and generates high coupling-in conduction efficiency, thereby greatly improving the whole coupling-out efficiency; and the coupling-out uniformity of the whole surface is controlled point by matching with grating units with different morphologies in the topological morphology coupling-out area, so that the phenomenon of uneven light emission is effectively improved, and the coupling-out uniformity is high.
In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being "formed on," "disposed on" or "located on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.
In this document, unless specifically stated and limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.
In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. refer to the directions or positional relationships based on those shown in the drawings, and are merely for clarity and convenience of description of the expression technical solution, and thus should not be construed as limiting the present invention.
In this document, the use of the ordinal adjectives "first", "second", etc., to describe an element, is merely intended to distinguish between similar elements, and does not necessarily imply that the elements so described must be in a given sequence, or a temporal, spatial, hierarchical, or other limitation.
In this document, unless otherwise indicated, the meaning of "a plurality", "a number" is two or more.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements is included, and may include other elements not expressly listed.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. The super-configuration topological optical waveguide comprises a waveguide substrate (10), and is characterized in that a super-configuration coupling-in area (20) and a topological-configuration coupling-out area (30) are arranged on the waveguide substrate (10); the super-structure coupling-in area (20) is provided with a coupling-in grating (21) positioned on the surface of the waveguide substrate (10) and a super-material layer (22) covered on the coupling-in grating (21); the topological form coupling-out area (30) is provided with a coupling-out grating, the coupling-out grating comprises a plurality of rows of grating units (31) with coupling effect, and the forms of the grating units (31) in each row are different.
2. The supertopography topological optical waveguide of claim 1 wherein said metamaterial layer (22) is a metal film layer.
3. The super-topography topological optical waveguide of claim 1 wherein said metamaterial layer (22) has a refractive index greater than 1.5.
4. The super-topography topological optical waveguide of claim 1 wherein said layer of meta-material (22) has a thickness greater than or equal to 100 nanometers.
5. The super-structured topological optical waveguide of claim 1, wherein the angle of incidence of light rays at the super-structured coupling-in region (20) ranges from-20 degrees to 20 degrees.
6. The super-configuration topology optical waveguide of claim 1, characterized in that the in-coupling grating (21), the out-coupling grating are located on the same side surface of the waveguide substrate (10); the super-structure coupling-in area (20) adopts a transmission coupling mode or a reflection coupling mode to carry out light coupling.
7. The super-configuration topology optical waveguide of claim 1, characterized in that the grating units (31) are of a nano-lattice structure, each row of the grating units (31) comprises a plurality of nano-grating points (311), the nano-grating points (311) in the same row have the same structure, and the nano-grating points (311) in different rows have different structures.
8. The super-configuration topology optical waveguide of claim 1, characterized in that the grating units (31) are of a nano-lattice structure, each row of the grating units (31) comprises a plurality of nano-grating points (311), and the structure of each nano-grating point (311) is different.
9. The super-configuration topology optical waveguide of claim 7 or 8, characterized in that each row of the grating elements (31) extends along the x-direction of the waveguide substrate (10); the plurality of rows of grating units (31) form a two-dimensional array grating, the plurality of rows of nano grating points (311) of the grating units (31) are arranged periodically and are provided with a first grating orientation M and a second grating orientation N which are arranged in a crossing way, and an included angle between the first grating orientation M and the second grating orientation N is 20-160 degrees.
10. The super-structured topological optical waveguide of claim 7 or 8, wherein the super-structured coupling-in region (20) and the topological-structured coupling-out region (30) are rectangular and have a width and length direction coincident with the waveguide substrate (10), the super-structured coupling-in region (20) coinciding with a center line of the topological-structured coupling-out region (30) in the y-direction.
11. The super-configuration topology optical waveguide of claim 7 or 8, characterized in that the morphology of the grating unit (31) comprises the shape, width, height of each of the nano-grating points (311) within each row of the grating unit (31); the coupling-out conduction efficiency of the nano-grating point (311) in the y-direction from the direction close to the super-structure coupling-in region (20) to the direction far from the super-structure coupling-in region (20) increases with distance.
12. An augmented reality display device comprising a super-configured state topology optical waveguide as claimed in any one of claims 1 to 11.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211464488.4A CN118091818A (en) | 2022-11-22 | 2022-11-22 | Super-configuration topology optical waveguide and augmented reality display device |
| PCT/CN2023/082791 WO2024108829A1 (en) | 2022-11-22 | 2023-03-21 | Meta-structured and topological optical waveguide and augmented reality display device |
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|---|---|---|---|
| CN202211464488.4A CN118091818A (en) | 2022-11-22 | 2022-11-22 | Super-configuration topology optical waveguide and augmented reality display device |
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| CN118091818A true CN118091818A (en) | 2024-05-28 |
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| CN202211464488.4A Pending CN118091818A (en) | 2022-11-22 | 2022-11-22 | Super-configuration topology optical waveguide and augmented reality display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI128413B (en) * | 2017-06-02 | 2020-04-30 | Dispelix Oy | Diffractive element with doubly periodic gratings |
| CN111522084A (en) * | 2020-04-22 | 2020-08-11 | 深圳珑璟光电技术有限公司 | Grating structure and near-to-eye display system |
| CN216083281U (en) * | 2021-10-29 | 2022-03-18 | 苏州苏大维格科技集团股份有限公司 | Holographic waveguide sheet and augmented reality head-up display device |
| CN115201955B (en) * | 2022-09-08 | 2023-02-07 | 北京亮亮视野科技有限公司 | Two-dimensional coupling-out super-surface grating, two-dimensional diffraction optical waveguide and near-to-eye display device |
| CN115356803B (en) * | 2022-10-19 | 2023-03-10 | 北京驭光科技发展有限公司 | Diffractive optical waveguide, design method thereof and near-eye display device |
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