WO2019109585A1

WO2019109585A1 - Multi-row and multi-column equivalent negative-refractive-index slab lens

Info

Publication number: WO2019109585A1
Application number: PCT/CN2018/084738
Authority: WO
Inventors: 范超; 韩东成; 张亮亮; 李正军; 黄志刚
Original assignee: 安徽省东超科技有限公司
Priority date: 2017-12-09
Filing date: 2018-04-27
Publication date: 2019-06-13
Also published as: CN107831558A

Abstract

Disclosed is a multi-row and multi-column equivalent negative-refractive-index slab lens, comprising a pair of glass windows (1, 3) that respectively have two optical surfaces, and an optical waveguide assembly (2) located between the two glass windows (1, 3), wherein the optical waveguide assembly (2) comprises a multi-row and multi-column rectangular optical waveguide array that is obliquely arranged at an angle of 45°, and a peripheral optical waveguide arranged at the periphery of the rectangular optical waveguide array, and the size of a single rectangular optical waveguide in each column and/or each row of the rectangular optical waveguide array is identical. In the slab lens re-constructed by means of special precise micro-structures, the multi-row and multi-column rectangular optical waveguide array and peripheral triangular optical waveguides are used, which can enable a two-dimensional or three-dimensional light source to directly form a real image in the air, thus realizing a real holographic image.

Description

Multi-row multi-row equivalent negative refractive index flat lens

Technical field

The present invention relates to the field of optical technology, and in particular to an equivalent negative refractive index flat lens for achieving air imaging.

Background technique

With the development of imaging display technology, the requirements for imaging characteristics are constantly increasing. On the one hand, it is required to have a higher resolution, and to ensure the clarity of the image, it is also necessary to meet the requirements of small distortion. On the other hand, it is required to have a three-dimensional stereoscopic display characteristic and a naked eye three-dimensional holographic display requirement. On the one hand, the existing imaging technology mainly uses lens imaging, which is mainly limited by the field of view and the aperture. There are optical aberrations such as spherical aberration, coma, astigmatism, field curvature, distortion, chromatic aberration, etc., which are in a large field of view. The field of large aperture imaging display is limited. On the other hand, the existing naked-eye three-dimensional display technology is mostly based on adjusting the left and right eye parallax to realize three-dimensional sensory, rather than the actual three-dimensional display technology. Holographic imaging technology, the production cost is high.

Summary of the invention

In order to pursue a better display effect and product experience, the present invention provides an equivalent negative refractive index flat lens that can realize three-dimensional stereoscopic imaging display.

In order to solve the above technical problem, the present invention adopts the following technical solutions:

A multi-row, multi-row equivalent negative refractive index flat lens comprising a pair of glass windows each having two optical faces, and an optical waveguide assembly between the two glass windows, the optical waveguide assembly comprising a plurality of rows and columns A rectangular optical waveguide array arranged obliquely at 45[deg.] and an edge optical waveguide placed one turn around the rectangular optical waveguide array, each column of the rectangular optical waveguide array and/or a single rectangular optical waveguide of each row being the same size.

Further, the edge optical waveguides are sequentially connected by triangular optical waveguides of the same size.

Preferably, the edge L _{02T of the} single triangular optical waveguide satisfies 5 mm < L _02T < 30 mm, and the right side lengths W _02T , H _{02T of the} single triangular optical waveguide satisfy 0.2 mm < W _02T = H _02T < 5 mm.

Preferably, the long side L _{02 of the} single rectangular optical waveguide satisfies 5 mm < L ₀₂ < 30 mm, and the end width W ₀₂ and the end length H _{02 of the} single rectangular optical waveguide satisfy 0.2 mm < W ₀₂ = H ₀₂ < 5 mm.

Preferably, photosensitive glue is disposed between adjacent rectangular optical waveguides, between adjacent rectangular optical waveguides and edge optical waveguides, between rectangular optical waveguides and glass windows, and between edge optical waveguides and glass windows.

It can be known from the above technical solutions that the flat lens reconstructed by the special precision microstructure adopts a multi-row and multi-row rectangular optical waveguide array and a peripheral triangular optical waveguide, so that the two-dimensional or three-dimensional light source can be realized directly in the air. The real holographic image realizes the three-dimensional display characteristics of the naked eye while realizing large field of view, large aperture, high resolution, no distortion, and no dispersion, and has high processability, convenient assembly and low cost.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention;

2 is a schematic view of an optical waveguide assembly of the present invention;

3 is a schematic structural view of adjacent rectangular optical waveguides and triangular optical waveguides in an optical waveguide assembly;

Figure 4 is a partial top view of the present invention;

Figure 5 is a schematic diagram of light reflection inside the optical waveguide assembly in the embodiment;

6 is a schematic view of the embodiment in which the miscellaneous beam covers the pixel area of the imaging surface after passing through the optical waveguide;

7 is a schematic view showing the direction of the A and B beams after the optical waveguide is moved up in the embodiment;

Figure 8 is a schematic view showing the direction of the C beam after the optical waveguide is rotated 45° in the embodiment;

Fig. 9 is a schematic diagram showing the imaging of the optical waveguide assembly in the embodiment.

Detailed ways

A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the equivalent negative refractive index flat lens includes, in order from the object side to the image side, a first glazing unit 1, two sets of optical waveguide assemblies 2, and a second glazing unit 3. The first glazing and the second glazing each have two optical faces for primarily protecting the optical waveguide assembly.

As shown in FIG. 2, the optical waveguide assembly comprises a plurality of rows and columns of rectangular optical waveguide arrays arranged obliquely at 45[deg.], and an edge optical waveguide disposed at a periphery of the rectangular optical waveguide array to be spliced into a lens. .

Each column of the rectangular optical waveguide array and/or a single rectangular optical waveguide of each row has the same size, and the rectangular optical waveguide material has an optical refractive index n ₁ , n ₁ >1.4, and each rectangular optical waveguide and its adjacent rectangular optical waveguide There is an interface between the joints, and the joints are joined by the photosensitive glue 4, and the photosensitive adhesive has a thickness of T ₁ and T ₁ >0.001 mm. A photosensitive paste is also disposed between the rectangular optical waveguide and the glass window, and is used to avoid damage to the total reflection condition, as shown in FIG.

The long side L _{02 of} a single rectangular optical waveguide satisfies 5 mm < L ₀₂ < 30 mm, the end width W ₀₂ and the end length H _{02 of} a single rectangular optical waveguide satisfy 0.2 mm < W ₀₂ = H ₀₂ < 5 mm, and the entire optical waveguide assembly The shape needs to be set according to the application scenario. In this embodiment, the edge optical waveguides are sequentially connected by triangular optical waveguides of the same size, and the edge L _{02T of the} single triangular optical waveguide satisfies 5 mm<L _02T <30 mm, and the right angle side of the single triangular optical waveguide The lengths W _02T and H _02T satisfy 0.2 mm < W _02T = H _02T < 5 mm. Large size requirements can be achieved by splicing multiple optical waveguide assemblies on a large screen display.

Photosensitive glue is also disposed between the adjacent rectangular optical waveguide and the triangular optical waveguide, and between the triangular optical waveguide and the glass window.

The optical waveguides of the optical waveguide assembly are arranged orthogonally between the optical waveguides, so that the waveguide directions are perpendicular to each other, so that the orthogonal two directions of the light beams converge at one point, and the object image plane is symmetrical with respect to the equivalent negative refractive index flat lens, resulting in an equivalent The negative refractive index phenomenon enables the imaging of flat lenses.

The imaging principle of the present invention will be described below with reference to Figures 5-9:

The light is internally reflected by the equivalent negative refractive index flat lens optical waveguide, and there are one or more reflections (refer to FIG. 5). The fiber bundle entering the single optical waveguide is reflected and divided into four beams, one beam participates in imaging, and the three beams form interference interference. The light, respectively, is beams A, B, and C, which are covered by the optical waveguide and covered by the pixel area of the imaging surface, as shown in FIG. 6. As shown in FIG. 9, in order to achieve good imaging and avoid stray light interference, the rectangular optical waveguide is arranged in multiple rows and columns and arranged obliquely at 45[deg.], and the right-angled edges of the triangular optical waveguide are respectively aligned with the length and width of the ends of the rectangular optical waveguide. Engage. The final imaging effect of this imaging principle is consistent with a flat lens made of a negative refractive index material.

In order to avoid the stray light effect imaging shown in Fig. 6, the direction of the optical waveguide array needs to be arranged in the direction of 45°, thereby eliminating the influence of stray light. The specific principle is as follows:

Each unit of the optical waveguide array is shown as a cube R in the figure. A single cube can divide the beam into 4 parts, wherein D rays participate in imaging, and beams A, B, and C are stray light, and FIG. 6 shows groups a, b, and c. Imaging, the stray beams A, B, and C cover the imaging surface area after passing through the optical waveguide. As shown in FIG. 7, the optical waveguide is moved upward relative to the object, thereby avoiding the influence of the A and B light on the imaging surface, but at this time, the C light covers the image surface, and then the optical waveguide is rotated 45° around the center, as shown in FIG. , can avoid the interference of A, B, C light on the imaging surface. Considering that the optical waveguides are arranged in an array along the 45° direction, the D-beams generated by this type of arrangement participate in imaging, and the remaining three beams do not interfere with imaging. The final imaging effect of the imaging principle is a flat lens made of a negative refractive index material. Consistent.

The above described embodiments are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications of the technical solutions of the present invention will be made by those skilled in the art without departing from the spirit of the invention. And improvements are intended to fall within the scope of the protection as defined by the appended claims.

Claims

A multi-row, multi-row equivalent negative refractive index flat lens comprising a pair of glass windows each having two optical faces, and an optical waveguide assembly between the two glass windows, the optical waveguide The assembly includes a plurality of rows and columns of rectangular optical waveguide arrays arranged at an oblique angle of 45°, and edge optical waveguides disposed one turn of the periphery of the rectangular optical waveguide array, each column and/or each of the rectangular optical waveguide arrays The individual rectangular optical waveguides of the row are the same size.
The multi-row multi-row equivalent negative refractive index flat lens according to claim 1, wherein the edge optical waveguides are sequentially connected by triangular optical waveguides of the same size.
The multi-row multi-row equivalent negative refractive index flat lens according to claim 2, wherein an edge L 02T of a single said triangular optical waveguide satisfies 5 mm < L 02T < 30 mm, a single said triangular optical waveguide The right side lengths W 02T and H 02T satisfy 0.2mm<W 02T =H 02T <5mm.
The multi-row multi-row equivalent negative refractive index flat lens according to claim 1, wherein a long side L 02 of a single said rectangular optical waveguide satisfies 5 mm < L 02 < 30 mm, a single said rectangular optical waveguide The end width W 02 and the end length H 02 satisfy 0.2 mm < W 02 = H 02 < 5 mm.
The multi-row multi-row equivalent negative refractive index flat lens according to any one of claims 1 to 4, wherein adjacent rectangular optical waveguides between adjacent rectangular optical waveguides and said Photosensitive adhesive is disposed between the edge optical waveguides, between the rectangular optical waveguide and the glass window, and between the edge optical waveguide and the glass window.