A vortex light in-plane imaging structure based on anisotropic medium

Abstract

The present invention relates to the technical field of vortex light imaging structures. During the transmission process, an optical orbital angular momentum system may encounter various particles or inhomogeneous media, causing light beams to scatter. Existing optical orbital angular momentum systems require complex optical elements and precise control technology, which not only increases manufacturing costs but also makes operation more difficult. The present invention provides a vortex light in-plane imaging structure based on anisotropic media, which forms a vortex light image with the same order of orbital angular momentum as the vortex light source in the object space in the image space, places a vortex light source of any order at the center of the object space, and transmits it through anisotropic media with different main axis directions to obtain a convergent vortex light image of the corresponding order at the center of the image space, thereby enabling any order vortex light source to be imaged to a specific position without distortion, thereby achieving distortion-free long-distance transmission of any order vortex light source without any scanning. The present invention can be used in the field of multiplexed communication based on vortex light.

Description

Technical Field

[0001] The present invention relates to the technical field of vortex light imaging structures, and more particularly to a vortex light in-plane imaging structure based on anisotropic media. Background Art

[0002] In recent years, research on optical orbital angular momentum (OAM) has garnered widespread attention and plays a crucial role in diverse fields, including imaging, quantum entanglement, and communications. Due to its multiple degrees of freedom, OAM exhibits significant potential for improving signal capacity and transmission efficiency, attracting increasing research attention. When using OAM to carry signals, vortex light with different OAM orders can be used to transmit information across different channels, enabling simultaneous multiplexing of multiple channels. This is expected to become a key approach for future communications. However, existing OAM systems may encounter various particles or inhomogeneous media during transmission, causing the beam to scatter. As transmission distance increases, diffraction effects cause the vortex light wavefront to gradually diffuse. This diffusion reduces the coherence of the beam, lowering the central intensity of the vortex beam and increasing the intensity at the edges. This causes the vortex light to deform during transmission, leading to vortex phase distortion and loss of some transmitted information, compromising accurate information reception. Therefore, achieving distortion-free, long-distance transmission of vortex light with different OAM orders remains a technical bottleneck. In addition, existing optical orbital angular momentum systems often require complex optical components and precise control technology, which not only increases the manufacturing cost of the optical orbital angular momentum system, but also increases the difficulty of operation. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a vortex light in-plane imaging structure based on anisotropic media, which can generate a vortex light image of the corresponding order of orbital angular momentum in a given area without distortion for a vortex light source of any order, so as to realize the distortion-free imaging of the vortex light source of any order to a specific position, and thus obtain the distortion-free long-distance transmission of the vortex light source of any order.

[0004] To achieve the above object, the present invention adopts the following scheme:

[0005] A vortex light in-plane imaging structure based on anisotropic medium, the vortex light in-plane imaging structure includes an object space, an image space and an area filled with anisotropic medium, the area filled with anisotropic medium includes a first trapezoidal area, a rectangular area, a second trapezoidal area, a third trapezoidal area and two triangular areas, wherein: a rectangular area is between the first trapezoidal area and the second trapezoidal area, the trapezoidal structure formed by the first trapezoidal area, the rectangular area and the second trapezoidal area is the same as the third trapezoidal area, and the upper base of the trapezoidal structure is attached to the upper base of the third trapezoidal area to form a structure with concave triangles on both sides, and the two triangular areas are respectively located at the positions of the concave triangles on both sides. The imaging structure in the vortex light plane is in the shape of a cuboid; each area filled with anisotropic medium is fitted with adjacent areas; the object space and the image space are in the shape of a cylinder, the object space is distributed at the connection between the first trapezoidal area and the rectangular area, the image space is distributed at the connection between the second trapezoidal area and the rectangular area, and the object space and the image space are symmetrically distributed about the rectangular area, the axial direction of the object space passes through the first trapezoidal area and the rectangular area, the axial direction of the image space passes through the second trapezoidal area and the rectangular area, a vortex light source with an arbitrary order of orbital angular momentum is provided at the center of the object space, and an absorber for absorbing the vortex light image converged in the image space is provided at the center of the image space.

[0006] Furthermore, the object space and the image space are filled with air, and the relative dielectric constant and the magnetic permeability of the object space and the image space are both 1.

[0007] Furthermore, the diameters of the object space and the image space are the same.

[0008] Furthermore, the anisotropic medium in each area of ​​the anisotropic medium-filled region has one and only one principal axis direction, the principal axis directions of the anisotropic medium in the two triangular areas are perpendicular to the object space axis and the upper base of the third trapezoidal area; the principal axis directions of the anisotropic medium in the first trapezoidal area, the rectangular area, the second trapezoidal area, and the third trapezoidal area are perpendicular to the principal axis directions of the anisotropic medium in the two triangular areas and perpendicular to the object space axis.

[0009] Furthermore, the relative dielectric constant of the anisotropic medium along the main axis direction is greater than 10, the magnetic permeability along the main axis direction is greater than 10, the relative dielectric constant of the anisotropic medium perpendicular to the main axis direction is less than 0.1, and the magnetic permeability perpendicular to the main axis direction is less than 0.1.

[0010] Furthermore, the object space is symmetrically distributed about the fitting plane of the first trapezoidal area and the rectangular area; and the image space is symmetrically distributed about the fitting plane of the second trapezoidal area and the rectangular area.

[0011] In summary, the present invention has the following beneficial effects:

[0012] The present invention proposes an in-plane imaging structure of vortex light based on anisotropic medium to image vortex light sources of arbitrary order orbital angular momentum: the radius sizes of the object space and the image space in the structure of the present invention are adjusted according to the size of the actual vortex light source. Through the structure of the present invention, a vortex light source with different order orbital angular momentum is placed in the object space, and a vortex light image with the same order orbital angular momentum is formed in the image space, and the vortex light source with arbitrary order orbital angular momentum in the plane is imaged to a given area without distortion, thereby realizing distortion-free transmission of vortex light sources with arbitrary order orbital angular momentum, which is used in communication technology based on vortex light. The structure of the present invention directly images the vortex light source in the object space to the image space in real time without any scanning. The present invention can be used in fields such as multiplexed communication based on vortex light. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention.

[0014] Figure 2 It is a plan view of the present invention.

[0015] Figure 3 These are the numerical simulation results of a vortex light source with zero orbital angular momentum.

[0016] Figure 4 These are the numerical simulation results of a vortex light source with an orbital angular momentum of 1.

[0017] Figure 5 These are the numerical simulation results of a vortex light source with an orbital angular momentum of 2.

[0018] Figure 6 These are the numerical simulation results of a vortex light source with an orbital angular momentum of 3.

[0019] In the figure, 1 is object space, 2 is image space, 3 is the first trapezoidal area, 4 is the rectangular area, 5 is the second trapezoidal area, 6 is the third trapezoidal area, 7 is the first triangular area, and 8 is the second triangular area. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below with reference to the accompanying drawings.

[0021] It should be noted that, for the sake of convenience, the directions described below are consistent with the directions of the drawings themselves, but do not limit the structure of the present invention.

[0022] like Figures 1 to 6 As shown, the present invention discloses a vortex light in-plane imaging structure based on anisotropic medium, the vortex light in-plane imaging structure includes an object space 1, an image space 2 and an area filled with anisotropic medium, the area filled with anisotropic medium includes a first trapezoidal area 3, a rectangular area 4, a second trapezoidal area 5, a third trapezoidal area 6 and two triangular areas, namely Figure 1 The first triangular area 7 and the second triangular area 8 are shown, wherein: the rectangular area 4 is between the first trapezoidal area 3 and the second trapezoidal area 5, the trapezoidal structure composed of the first trapezoidal area 3, the rectangular area 4 and the second trapezoidal area 5 is the same as the third trapezoidal area 6, and the upper base of the trapezoidal structure is attached to the upper base of the third trapezoidal area 6 to form a structure with concave triangles on both sides, and the two triangular areas, namely the first triangular area 7 and the second triangular area 8, are respectively located at the positions of the concave triangles on both sides, so that the imaging structure in the vortex light surface is a rectangular parallelepiped; each area of ​​the area filled with anisotropic medium is attached to the adjacent area The object space 1 and the image space 2 are cylindrical, the object space 1 is distributed at the connection of the first trapezoidal area 3 and the rectangular area 4, the image space 2 is distributed at the connection of the second trapezoidal area 5 and the rectangular area 4, and the object space 1 and the image space 2 are symmetrically distributed about the rectangular area 4. The axial direction of the object space 1 passes through the first trapezoidal area 3 and the rectangular area 4, and the axial direction of the image space 2 passes through the second trapezoidal area 5 and the rectangular area 4. The object space 1 is symmetrically distributed about the fitting plane of the first trapezoidal area 3 and the rectangular area 4, and the image space 2 is symmetrically distributed about the fitting plane of the second trapezoidal area 5 and the rectangular area 4, as shown in FIG. Figure 1 As shown, the XYZ coordinate axis is marked in the lower left corner of the figure to indicate the direction. The axis of the object space 1 and the image space 2 is parallel to the Z axis, and the object space 1 and the image space 2 pass through the imaging structure in the vortex light plane in the Z axis direction. The upper and lower bases of the trapezoidal structure and the third trapezoidal area 6 are parallel to the X axis. A vortex light source with an arbitrary order of orbital angular momentum is provided at the center of the object space 1, and an absorber for absorbing the vortex light image converged in the image space 2 is provided at the center of the image space 2, forming a vortex light image with the same order of orbital angular momentum as the vortex light source in the object space 1 in the image space 2. When in use, a vortex light source of arbitrary order is placed at the center of the object space, and transmitted through an anisotropic medium with different principal axis directions, so that a converged vortex light image of the corresponding order can be obtained at the center of the image space.

[0023] The object space 1 and the image space 2 are filled with air, the relative dielectric constant of the object space 1 and the image space 2 is 1, the magnetic permeability is 1, the diameter of the object space 1 and the image space 2 is the same, and the radius size of the object space 1 and the image space 2 is adjusted according to the size of the actual vortex light source.

[0024] The anisotropic medium in each region has only one principal axis direction. The relative permittivity and permeability of the anisotropic medium along the principal axis direction are both large, while the permittivity and permeability components perpendicular to the principal axis direction tend to zero. The principal axis directions of the anisotropic medium in the two triangular regions are perpendicular to the axis of the object space 1 and the upper base of the third trapezoidal region 6, that is, Figure 1The Y-axis direction shown; the main axis direction of the anisotropic medium in the first trapezoidal area 3, the rectangular area 4, the second trapezoidal area 5 and the third trapezoidal area 6 is perpendicular to the main axis direction of the anisotropic medium in the two triangular areas and perpendicular to the axis of the object space 1, that is, the main axis direction of the anisotropic medium in the first trapezoidal area 3, the rectangular area 4, the second trapezoidal area 5 and the third trapezoidal area 6 is perpendicular to the main axis direction of the anisotropic medium in the two triangular areas. Figure 1 The X-axis is shown as parallel. The relative permittivity of an anisotropic medium along the main axis is greater than 10, and the magnetic permeability along the main axis is greater than 10. The relative permittivity of an anisotropic medium perpendicular to the main axis is less than 0.1, and the magnetic permeability perpendicular to the main axis is less than 0.1.

[0025] Example

[0026] In this embodiment, the working wavelength of the electromagnetic wave is 3 cm, and the corresponding frequency is 10 GHz. Object space 1 and image space 2 are both cylindrical areas, and both are filled with air. The imaging structure in the vortex light plane is divided into six different areas, namely the areas filled with anisotropic media. The specific structural shape is as follows: Figure 1 and Figure 2 As shown. In this embodiment, the cross-sectional dimensions of each area are as follows: the radius of the object space 1 and the image space 2 are both 12 cm. When in use, an absorber with a radius of 1 cm is placed in the center of the image space 2 to absorb the vortex light image converged in the image space. The upper base of the first trapezoidal area 3 and the second trapezoidal area 5 is 28 cm, the lower base is 20 cm, and the height is 26 cm, and each trapezoid is dug out a semicircle with a radius of 12 cm. The rectangular area 4 is 30 cm long and 26 cm wide, and two semicircles with a radius of 12 cm are dug out. The cross-sections of the two triangular areas are isosceles triangles, and the base length of each triangle is 52 cm and the height is 8 cm. The third trapezoidal area is an isosceles trapezoid with an upper base of 70 cm, a lower base of 86 cm, and a height of 26 cm.

[0027] The relative permittivity and permeability of object space 1 and image space 2 are both 1. Six regions are filled with a specific anisotropic medium. Each region has a single principal axis. The principal axis of the anisotropic medium in the first trapezoidal region 3, rectangular region 4, second trapezoidal region 5, and third trapezoidal region 6 is along the X-axis, while the principal axis of the anisotropic medium in the two triangular regions is along the Y-axis. The permittivity and permeability of the anisotropic medium along the principal axis are 10,000; the permittivity and permeability perpendicular to the principal axis are 0.0001.

[0028] When a vortex light source with an orbital angular momentum of 0 is placed at the center of the object space 1, a vortex light image with an orbital angular momentum of 0 is formed in the image space 2 through the vortex light in-plane imaging structure of the present invention. Figure 3This is the numerical simulation result of the vortex light source with an orbital angular momentum of 0 in this embodiment.

[0029] When a vortex light source with an orbital angular momentum of 1 is placed at the center of the object space 1, a vortex light image with an orbital angular momentum of 1 is formed in the image space 2 through the vortex light in-plane imaging structure of the present invention. Figure 4 This is the numerical simulation result of the vortex light source with an orbital angular momentum of 1 in this embodiment.

[0030] When a vortex light source with an orbital angular momentum of 2 is placed at the center of the object space 1, a vortex light image with an orbital angular momentum of 2 is formed in the image space 2 through the vortex light in-plane imaging structure of the present invention. Figure 5 This is the numerical simulation result of the vortex light source with an orbital angular momentum of 2 in this embodiment.

[0031] When a vortex light source with an orbital angular momentum of 3 is placed at the center of the object space 1, a vortex light image with an orbital angular momentum of 3 is formed in the image space 2 through the vortex light in-plane imaging structure of the present invention. Figure 6 This is the numerical simulation result of the vortex light source with an orbital angular momentum of 3 in this embodiment.

[0032] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A vortex light in-plane imaging structure based on anisotropic media, characterized by: The vortex light in-plane imaging structure includes an object space (1), an image space (2), and an area filled with anisotropic medium, wherein the area filled with anisotropic medium includes a first trapezoidal area (3), a rectangular area (4), a second trapezoidal area (5), a third trapezoidal area (6), and two triangular areas, wherein: A rectangular area (4) is located between the first trapezoidal area (3) and the second trapezoidal area (5); the trapezoidal structure formed by the first trapezoidal area (3), the rectangular area (4) and the second trapezoidal area (5) is the same as the third trapezoidal area (6); the upper base of the trapezoidal structure is bonded to the upper base of the third trapezoidal area (6) to form a structure with concave triangles on both sides; the two triangular areas are respectively located at the positions of the concave triangles on both sides, so that the imaging structure in the vortex light plane is in the shape of a rectangular parallelepiped; each area of ​​the area filled with the anisotropic medium is bonded to the adjacent area; The object space (1) and the image space (2) are cylindrical, the object space (1) is distributed at the connection between the first trapezoidal area (3) and the rectangular area (4), the image space (2) is distributed at the connection between the second trapezoidal area (5) and the rectangular area (4), and the object space (1) and the image space (2) are symmetrically distributed about the rectangular area (4), the axial direction of the object space (1) passes through the first trapezoidal area (3) and the rectangular area (4), and the axial direction of the image space (2) passes through the second trapezoidal area (5) and the rectangular area (4), a vortex light source of arbitrary order orbital angular momentum is provided at the center of the object space (1), and an absorber for absorbing the vortex light image converged in the image space (2) is provided at the center of the image space (2); The object space (1) and the image space (2) are filled with air, and the relative dielectric constant of the object space (1) and the image space (2) is 1, and the magnetic permeability is 1; The anisotropic medium in each area of ​​the anisotropic medium-filled area has one and only one principal axis direction, and the principal axis directions of the anisotropic medium in the two triangular areas are perpendicular to the axis of the object space (1) and the upper base of the third trapezoidal area (6); the principal axis directions of the anisotropic medium in the first trapezoidal area (3), the rectangular area (4), the second trapezoidal area (5) and the third trapezoidal area (6) are perpendicular to the principal axis directions of the anisotropic medium in the two triangular areas and perpendicular to the axis of the object space (1); The object space (1) is symmetrically distributed with respect to a fitting plane of the first trapezoidal region (3) and the rectangular region (4); and the image space (2) is symmetrically distributed with respect to a fitting plane of the second trapezoidal region (5) and the rectangular region (4).

2. The vortex light in-plane imaging structure based on anisotropic medium according to claim 1, characterized in that: The object space (1) and the image space (2) have the same diameter.

3. The vortex light in-plane imaging structure based on anisotropic medium according to claim 1, characterized in that: The relative dielectric constant of the anisotropic medium along the main axis direction is greater than 10, and the magnetic permeability along the main axis direction is greater than 10. The relative dielectric constant of the anisotropic medium perpendicular to the main axis direction is less than 0.1, and the magnetic permeability perpendicular to the main axis direction is less than 0.1.

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