Total space near and far field regulation and control method based on coherent pixel super-structure surface

Abstract

The invention discloses a total-space near-far field regulation and control method based on a coherent pixel super-structure surface. The method comprises the following steps: 1) constructing a nano-structure unit and a super-unit; 2) optimizing the structural parameters of the nano-structure unit according to the incident light wavelength lambda, and verifying the regulation and control effects of the super-unit I and the super-unit II; and 3) constructing a nano-structure array, wherein the nano-structure array comprises a plurality of super-units I and super-units II. Left-handed / right-handed circularly polarized light is set to be incident to the surface of the single-layer metastructure, binary nano printing of an image is achieved in a near field, and near-field nano printing intensities in a transmission space and a reflection space are complementary; different holographic patterns are respectively presented in the far-field transflective space, and the far-field transflective channels are regulated and controlled by mutually independent and continuous phases. By properly designing the single-layer nano brick, continuous and independent phase control of reflection and transmission spaces can be realized without additional equipment, far-field holographic imaging and near-field nano printing can be realized, and the single-layer nano brick can be applied to the fields of depth detection, three-dimensional imaging, optical encryption, high-resolution image storage and the like.

Description

Technical Field

[0001] The present invention belongs to the field of micro-nano optics and polarization optics technology, and in particular relates to a full-space near-field and far-field control method based on coherent pixel metasurface. Background Art

[0002] Metasurfaces are artificial optical materials composed of subwavelength nanostructures that enable light wave manipulation. By tailoring the size and orientation of the nanostructures, the phase, amplitude, and polarization of light waves can be individually manipulated. However, current metasurfaces have limitations in achieving full spatial manipulation and unified near- and far-field control.

[0003] Several methods have been proposed to achieve near- and far-field control, but most structures only effectively control within half the space, making it difficult to achieve full-space control, resulting in the loss of information in half the space. Other studies have only achieved full-space far-field control, lacking near-field control capabilities. Therefore, this paper introduces coherent pixels based on full-space metasurfaces to increase the control freedom and achieve near- and far-field control in the full space of a single-layer metasurface. Summary of the Invention

[0004] The present invention aims to overcome the aforementioned problems of the existing technology and provides a method for full-space near- and far-field control based on coherent pixel metasurfaces. By introducing two superunits onto a single-layer metasurface and cleverly designing the size and orientation of the nanostructures, the present invention enables independent and efficient light field control in both reflection and transmission. This approach holds great promise for applications in depth detection, optical encryption, and high-resolution image storage.

[0005] The technical solution of the present invention is as follows:

[0006] A full-space near-field and far-field control method based on coherent pixel metasurface is proposed. Left-handed / right-handed circularly polarized light is incident on a single-layer metasurface to achieve binary nanoprinting of images in the near field. The near-field nanoprinting intensities in the transmission and reflection spaces are complementary; different holographic patterns are presented in the far-field transmission and reflection space, respectively. The phases of the far-field transmission and reflection channels are independent of each other and can be continuously controlled.

[0007] The specific steps include:

[0008] 1) Constructing a nanostructure unit; the single-layer metasurface is composed of a fused quartz substrate and a silicon nanobrick array, and rectangular nanobricks I and II of the same size and the substrate form two unit structures with different functions; an xoy coordinate system is established with the right-angled sides of the structural unit as the x-axis and the y-axis, the long side of the nanobrick is the major axis, the short side is the minor axis, and the angle between the long axis of the nanobrick and the x-axis is the turning angle θ of the nanobrick; the angle between the long axes of nanobricks I and II in superunit I is 0°, and the angle between the long axes of nanobricks I and II in superunit II is 90°;

[0009] 2) Optimizing the structural parameters of the nanostructure unit according to the incident light wavelength λ, wherein the structural parameters include: the major axis L, the minor axis W, the height H, and the unit size CS of the nanobrick;

[0010] 3) constructing a nanostructure array comprising a plurality of nanostructure units; setting left-handed / right-handed circularly polarized light to be incident on a single-layer metasurface, and realizing binary nanoprinting of an image in the near field, wherein the near-field nanoprinting intensities in the transmission and reflection spaces are complementary; in the far-field control, the orientation angle arrangement of the metasurface is obtained by phase restoration and simulated, and different holographic patterns are presented in the transmission and reflection spaces, respectively, and the above-mentioned far-field transmission and reflection channels are controlled by mutually independent and continuous phases.

[0011] Furthermore, the structural parameters of the nanostructure unit in step 2) are obtained by electromagnetic simulation optimization according to the selected incident light wavelength λ.

[0012] Furthermore, the far-field transflective channel described in step 3) is controlled by mutually independent and continuous phases, specifically including: in the nanostructure array, nanobricks I and nanobricks II form two types of super units according to the coherent pixel principle, super unit I is a transmissive super unit, and super unit II is a reflective super unit, specifically including the following steps:

[0013] 31) For super unit I, the angle between the long axes of nanobrick I and nanobrick II is 0°. The transmission matrix can be derived from the coherent pixel Jones matrix:

[0014]

[0015] Where: θ1 and θ2 are the orientation angles of nanobrick I and nanobrick II respectively. In the transmission space, the output light field of the unit structure satisfies the relationship that the amplitude is 1 and the phase delay is twice the rotation angle, that is,

[0016] 32) For super unit II, the angle between the long axis of nano brick I and nano brick II is 90°, then the transmission cross polarization conversion rate is:

[0017]

[0018] When the orientation angle difference between two adjacent nanobricks is 90°, the phase delay difference is π. According to the coherent decomposition principle of light waves, the incident light is blocked by the transmission light of super unit II and can only be reflected by super unit II again. In the reflection space, the output light field of the unit structure satisfies the relationship of amplitude 1 and phase delay four times the rotation angle, that is,

[0019] Furthermore, the binary nano-printing described in step 3) includes:

[0020] A threshold of 0.5 is defined, with values above 0.5 defined as high and values below 0.5 as low. In transmission space, supercell I has an amplitude close to 1, which corresponds to a high value and bright areas in the near-field image; supercell II has an amplitude close to 0, which corresponds to a low value and dark areas in the near-field image. In reflection space, supercell I has an amplitude close to 0, which corresponds to a low value and dark areas in the near-field image; supercell II has an amplitude close to 1, which corresponds to a high value and bright areas in the near-field image, achieving complementary distributions of near-field image intensity in transmission and reflection space. The two supercells are arranged according to the high and low amplitude values and near-field pattern, completing the binary design of near-field printing.

[0021] Furthermore, the phase restoration described in step 3) is achieved by obtaining the position arrangement of the super unit through nano-printing and then implementing it according to phase iteration, wherein the specific steps of reflected light phase restoration and transmitted light phase restoration include:

[0022] a. For supercell I, when the nanobrick's steering angle θ1 varies within the range [0,π], its corresponding phase changes, achieving near-field high-value modulation in the transmission space;

[0023] b. Obtain the positional arrangement of superunit I based on nanoprinting, obtain the orientation angle distribution of superunit I based on the phase iteration hologram, and calculate the final distribution of superunit I;

[0024] c. For supercell II, when the steering angles θ1 and θ2 of the nanobrick vary within the range [0,π], the corresponding phase changes, achieving near-field low-value modulation in the transmission space;

[0025] d. Obtain the positional arrangement of superunit II based on nanoprinting, obtain the orientation angle distribution of superunit II based on phase iteration hologram, and calculate the final distribution of superunit II;

[0026] By arranging the steering angles of the nanobricks and the positions of the superunits, independent and efficient light field control can be achieved in the reflection and transmission spaces, while realizing the functional combination of near-field nanoprinting and far-field holographic display.

[0027] Furthermore, the single-layer metasurface is composed of nanobricks of the same size and different rotation angles, wherein superunit I is a transmission unit structure, which can be used for transmission holographic reconstruction and transmission near-field high-value regulation; superunit II is a reflection unit structure, which can be used for reflection holographic reconstruction and transmission near-field low-value regulation.

[0028] The present invention realizes full-space near-field and far-field control, and simultaneously decouples the transmitted light field and the reflected light field.

[0029] The present invention employs left-handed and right-handed circularly polarized light incident on the nanostructure array. In the near-field binary nanoprinting pattern, the transmitted and reflected near-field printed images have complementary intensities. In the far-field transflective and reflective spaces, distinct holographic patterns are presented, each channel independently and continuously phase-controlled. By appropriately designing the steering angles of the single-layer nanobricks and the position of the supercells, the present invention achieves continuous and independent phase control in both the reflected and transmitted spaces, as well as the dual functionality of holography and nanoprinting, without the need for additional equipment. This approach has applications in depth detection, 3D imaging, optical encryption, and high-resolution image storage.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1) By adopting the technical solution of the present invention, by appropriately designing the single-layer metasurface structure parameters and phase arrangement, near-field and far-field control of the light beam in the entire space is realized, achieving the decoupling of the transmitted light field and the reflected light field, and combining the near-field nanoprinting with the far-field holographic function, realizing light beam control at different transmission distances.

[0032] 2) The design of the present invention increases the freedom of lightwave manipulation by introducing two types of metacells based on coherent pixel theory onto a single-layer metasurface. The structure is simple, requiring only a single-layer metasurface to achieve full-space beam control. Therefore, the metasurface designed in this invention is small in size, lightweight, and easy to process, making it suitable for future miniaturization, micro-processing, and integration.

[0033] 3) The two holographic images produced by the present invention are obtained by continuous and precise phase control, with little crosstalk between the images, and are therefore suitable for high-quality holographic imaging; the obtained near-field nanoprinted images have clear edges, high imaging contrast, and high near-field imaging quality.

[0034] 4) This invention can achieve full-space information utilization, increasing device information capacity and enhancing device functionality, enabling large-capacity, multi-channel information storage and encoding. It can be applied to depth detection, three-dimensional imaging, optical encryption, and high-resolution image storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1a is the superunit I of the present invention, Figure 1bis a schematic diagram of superunit II of the present invention;

[0036] Figure 2 is the transmittance-reflection conversion rate of a single nanobrick unit of the present invention at the operating wavelength;

[0037] Figure 3 Schematic diagram of the polarization conversion efficiency in the transflective space of the present invention as the orientation angle of the nanobrick I in the super unit I changes from 0° to 180°;

[0038] Figure 4 Schematic diagram of the polarization conversion efficiency in the transflective space of the present invention as the orientation angle of the nanobrick I in the super unit II changes from 0° to 180°;

[0039] Figure 5 Schematic diagram of the transmission and reflection phases of the present invention changing with the orientation angle of nanobrick I;

[0040] Figure 6a is the near-field nano-printed image of the restored transmission region of the present invention, Figure 6b It is the far-field holographic image of the restored transmission area of the present invention;

[0041] Figure 7a is the near-field nano-printed image of the reduced reflective region of the present invention, Figure 7b is the far-field holographic image of the restored reflection region of the present invention;

[0042] Figure 8 It is a flow chart of the phase iterative optimization of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described below with reference to the embodiments, but the scope of protection of the present invention is not limited to the described scope.

[0044] A full-space beam decoupling and control method based on a single-layer metasurface is proposed. By introducing metacells I and II onto the single-layer metasurface and arranging them according to amplitude and near-field patterns, a binary design for near-field printing is achieved. Left-handed and right-handed circularly polarized light are incident on the nanostructure array, achieving binary nanoprinting of images in the near field. The near-field nanoprinted images in the transmission and reflection spaces complement each other in intensity, while distinct holographic patterns appear in the far-field transmission and reflection spaces, respectively, achieving full-space near-field and far-field control.

[0045] Furthermore, the method specifically includes the following steps:

[0046] 1) Constructing a nanostructure unit; the single-layer metasurface is composed of a fused quartz substrate and a silicon nanobrick array. Rectangular nanobricks I and II of the same size and the substrate form two unit structures with different functions. An xoy coordinate system is established with the right-angled sides of the structural unit as the x-axis and y-axis, the long side of the nanobrick is the major axis, the short side is the minor axis, and the angle between the long axis of the nanobrick and the x-axis is the turning angle θ of the nanobrick; in superunit I, the angle between the long axes of nanobrick I and nanobrick II is 0°, and in superunit II, the angle between the long axes of nanobrick I and nanobrick II is 90°;

[0047] 2) Optimizing the structural parameters of the nanostructure unit according to the incident light wavelength λ, wherein the structural parameters include: the major axis L, the minor axis W, the height H, and the unit size CS of the nanobrick;

[0048] 3) constructing a nanostructure array comprising a plurality of nanostructure units; setting left-handed / right-handed circularly polarized light to be incident on a single-layer metasurface, and realizing binary nanoprinting of an image in the near field, wherein the near-field nanoprinting intensities in the transmission and reflection spaces are complementary; in the far-field control, the orientation angle arrangement of the metasurface is obtained by phase restoration and simulated, and different holographic patterns are presented in the transmission and reflection spaces, respectively, and the above-mentioned far-field transmission and reflection channels are controlled by mutually independent and continuous phases.

[0049] Furthermore, the substrate in step 1) is made of fused quartz material, and the nanobricks are made of silicon material.

[0050] Furthermore, the structural parameters of the nanostructure unit in step 2) are obtained by optimizing the electromagnetic simulation software according to the selected wavelength λ of the incident light.

[0051] Furthermore, in the nanostructure array in step 3), nanobricks I and II are designed as high-transmittance half-wave plates with the same size. Specifically, the steps include:

[0052] a. For super unit I, the angle between the long axes of nanobrick I and nanobrick II is 0°. The transmission matrix can be derived from the coherent pixel Jones matrix:

[0053]

[0054] Where: θ1 and θ2 are the orientation angles of nanobrick I and nanobrick II, respectively. In the transmission space, the output light field of the unit structure satisfies the relationship that the amplitude is 1 and the phase delay is twice the rotation angle, that is,

[0055] b. For super unit II, the angle between the long axis of nanobrick I and nanobrick II is 90°, then the transmission cross-polarization conversion rate is:

[0056]

[0057] Furthermore, the single-layer metasurface is composed of two unit structures with different functions, namely, rectangular nanobricks of the same size and a substrate. Superunit I can achieve near-field high-value modulation in the transmission space; superunit II can achieve near-field high-value modulation in the reflection space.

[0058] Furthermore, the specific steps of the reflected light phase restoration and the transmitted light phase restoration include:

[0059] a. For supercell I, when the nanobrick's steering angle θ1 varies within the range [0,π], its corresponding phase changes, achieving near-field high-value modulation in the transmission space;

[0060] b. Obtain the positional arrangement of superunit I based on nanoprinting, obtain the orientation angle distribution of superunit I based on the phase iteration hologram, and calculate the final distribution of superunit I;

[0061] c. For supercell II, when the steering angles θ1 and θ2 of the nanobrick vary within the range [0,π], the corresponding phase changes, achieving near-field low-value modulation in the transmission space;

[0062] d. Obtain the positional arrangement of superunit II based on nanoprinting, obtain the orientation angle distribution of superunit II based on phase iteration hologram, and calculate the final distribution of superunit II;

[0063] By arranging the steering angles of the nanobricks and the positions of the superunits, independent and efficient light field control can be achieved in the reflection and transmission spaces, while realizing the functional combination of near-field nanoprinting and far-field holographic display.

[0064] Furthermore, binary nanoprinting can be performed in the near field, and independent and efficient light field control can be achieved in the far field reflection and transmission space.

[0065] This embodiment relates to a full-space near- and far-field control method based on a coherent pixel metasurface, and the specific steps are as follows:

[0066] First, construct nanostructured units, such as Figure 1a and Figure 1b As shown in the figure, the nano unit structure is composed of silicon nano bricks and a fused quartz substrate layer. Secondly, the design wavelength is selected as λ = 633 nm. For this wavelength, the nano-rotation structure unit is optimized and simulated using the electromagnetic simulation software CST. The dimensional parameters of the optimized silicon nano bricks are: length L is 132 nm, width W is 87 nm, height H is 148 nm, and unit size CS is 287 nm.

[0067] Under this structural parameter, the polarization conversion efficiency of nanobricks for circularly polarized light in the transmission and reflection space is as follows: Figure 2As shown, R-Co and R-Cross represent the co-polarization conversion efficiency and cross-polarization conversion rate of reflected light, respectively, and T-Co and T-Cross represent the co-polarization conversion efficiency and cross-polarization conversion rate of transmitted light, respectively. Figure 2 It can be seen that at the working wavelength of 633nm, R-Cross is 0.3%, T-Cross is as high as 95.3%, R-Co and T-Co are 4.1% and 0.2% respectively, indicating that the optimized nanobrick structure has good half-wave plate performance. Figure 3 It can be seen that at the operating wavelength of 633nm, the reflection co-polarization conversion efficiency of super unit I is R co =4.1%, reflection cross-polarization conversion efficiency R cross =0.3%, transmission co-polarization conversion efficiency T co =0.2%, transmission cross-polarization conversion efficiency T cross =95.3%, indicating that super unit I is mainly used for modulation of transmitted light, realizing near-field high-value modulation of the transmission space, and setting super unit I as a high-transmittance half-wave plate to realize modulation of transmitted light through the rotation angle θ1. Figure 4 It can be seen that at the operating wavelength of 633nm, the reflection co-polarization conversion efficiency of super unit II is R co =5.2%, reflection cross-polarization conversion efficiency R cross =92.9%, transmission co-polarization conversion efficiency T co =2.1%, transmission cross-polarization conversion efficiency T cross =2.2%, indicating that super unit II is mainly used for modulation of reflected light, realizing near-field high-value modulation of the reflection space. Setting super unit II with a high-transmittance half-wave plate can also realize modulation of reflected light by rotating at an angle of θ1. Figure 5 It is verified that when nanobrick I is subjected to angle scanning, the transmission phase delay of super unit I is twice the amount of change in orientation angle, while the reflection phase delay of super unit II is four times the amount of change in orientation angle.

[0068] Finally, a nanostructure array was constructed, comprising multiple nanostructure units. Each nanostructure unit is composed of superunit I and superunit II. The transmission amplitude of superunit I is 95.5%, which is a high value, while the transmission amplitude of superunit II is 4.3%, which is a low value. This can be used for the binary design of near-field printing. Superunit I is a transmission unit structure that achieves high-value modulation in the transmission space. The near-field nanoprinted image and far-field holographic image of its transmission area are as follows: Figure 6a and Figure 6b As shown, super unit II is a reflective unit structure, which realizes high value modulation in the reflection space. The near-field nano-printed image and far-field hologram of the reflection area are shown in Figure 7a and Figure 7bAs shown. Left-handed / right-handed circularly polarized light is incident on the nanostructure array, and the orientation angle distribution of super unit I and super unit II is obtained according to the GS algorithm and Fourier hologram. The phase distribution of transmission and reflection is calculated respectively. The orientation angle arrangement of the full-space single-layer metasurface is completed according to the relationship between phase and orientation angle. The phase reduction steps are as follows: Figure 8 shown.

[0069] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The scope of protection of the present invention should not be regarded as limited to the specific forms described in the embodiments. The scope of protection of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A full-space near- and far-field control method based on coherent pixel metasurface, characterized in that: By setting left-handed / right-handed circularly polarized light to be incident on a single-layer metasurface, binary nanoprinting of images is achieved in the near field, where the near-field nanoprinting intensities in the transmission and reflection spaces are complementary; different holographic patterns are presented in the far-field transmission and reflection spaces, and the phases of the above-mentioned far-field transmission and reflection channels are independent of each other and can be continuously controlled.

2. The full-space near-field and far-field control method based on coherent pixel metasurface according to claim 1 is characterized in that , specifically including the following steps: 1) Constructing a nanostructure unit; the single-layer metasurface is composed of a fused quartz substrate and a silicon nanobrick array, and rectangular nanobricks I and II of the same size and the substrate form two unit structures with different functions; an xoy coordinate system is established with the right-angled sides of the structural unit as the x-axis and the y-axis, the long side of the nanobrick is the major axis, the short side is the minor axis, and the angle between the long axis of the nanobrick and the x-axis is the turning angle θ of the nanobrick; the angle between the long axes of nanobricks I and II in superunit I is 0°, and the angle between the long axes of nanobricks I and II in superunit II is 90°; 2) Optimizing the structural parameters of the nanostructure unit according to the incident light wavelength λ, wherein the structural parameters include: the major axis L, the minor axis W, the height H, and the unit size CS of the nanobrick; 3) constructing a nanostructure array comprising a plurality of nanostructure units; setting left-handed / right-handed circularly polarized light to be incident on a single-layer metasurface, and realizing binary nanoprinting of an image in the near field, wherein the near-field nanoprinting intensities in the transmission and reflection spaces are complementary; in the far-field control, the orientation angle arrangement of the metasurface is obtained by phase restoration and simulated, and different holographic patterns are presented in the transmission and reflection spaces, respectively, and the above-mentioned far-field transmission and reflection channels are controlled by mutually independent and continuous phases.

3. The full-space near-field and far-field control method based on coherent pixel metasurface according to claim 2, characterized in that: The structural parameters of the nanostructure unit in step 2) are obtained by electromagnetic simulation optimization according to the selected incident light wavelength λ.

4. The full-space near-field and far-field control method based on coherent pixel metasurface according to claim 2, characterized in that: The far-field transflective channel described in step 3) is controlled by independent and continuous phases, specifically comprising: in the nanostructure array, nanobricks I and nanobricks II form two types of super units according to the coherent pixel principle, super unit I is a transmissive super unit, and super unit II is a reflective super unit, specifically comprising the following steps: 31) For super unit I, the angle between the long axes of nanobrick I and nanobrick II is 0°. The transmission matrix can be derived from the coherent pixel Jones matrix: Where: θ1 and θ2 are the orientation angles of nanobrick I and nanobrick II respectively. In the transmission space, the output light field of the unit structure satisfies the relationship that the amplitude is 1 and the phase delay is twice the rotation angle, that is, 32) For super unit II, the angle between the long axis of nano brick I and nano brick II is 90°, then the transmission cross polarization conversion rate is: When the orientation angle difference between two adjacent nanobricks is 90°, the phase delay difference is π. According to the coherent decomposition principle of light waves, the incident light is blocked by the transmission light of super unit II and can only be reflected by super unit II again. In the reflection space, the output light field of the unit structure satisfies the relationship of amplitude 1 and phase delay four times the rotation angle, that is, 5. The full-space near-field and far-field control method based on coherent pixel metasurface according to claim 2, characterized in that: The binary nano-printing described in step 3) includes: A threshold of 0.5 is defined, with values above 0.5 defined as high and values below 0.5 as low. In transmission space, supercell I has an amplitude close to 1, representing a high value, corresponding to bright areas in the near-field image; supercell II has an amplitude close to 0, representing a low value, corresponding to dark areas in the near-field image. In reflection space, supercell I has an amplitude close to 0, representing a low value, corresponding to dark areas in the near-field image; supercell II has an amplitude close to 1, representing a high value, corresponding to bright areas in the near-field image, achieving complementary distributions of near-field image intensity in transmission and reflection space. The two supercells are arranged according to the high and low amplitude values and near-field pattern, completing the binary design of near-field printing.

6. The full-space near-field and far-field control method based on coherent pixel metasurface according to claim 2, characterized in that: The phase restoration described in step 3) is achieved by obtaining the position arrangement of the super unit through nano-printing and then implementing it according to phase iteration, wherein the specific steps of reflected light phase restoration and transmitted light phase restoration include: a. For supercell I, when the nanobrick's steering angle θ1 varies within the range [0,π], its corresponding phase changes, achieving near-field high-value modulation in the transmission space; b. Obtain the positional arrangement of superunit I based on nanoprinting, obtain the orientation angle distribution of superunit I based on the phase iteration hologram, and calculate the final distribution of superunit I; c. For supercell II, when the steering angles θ1 and θ2 of the nanobrick vary within the range [0,π], the corresponding phase changes, achieving near-field low-value modulation in the transmission space; d. Obtain the positional arrangement of superunit II based on nanoprinting, obtain the orientation angle distribution of superunit II based on phase iteration hologram, and calculate the final distribution of superunit II; By arranging the steering angles of the nanobricks and the positions of the superunits, independent and efficient light field control can be achieved in the reflection and transmission spaces, while realizing the functional combination of near-field nanoprinting and far-field holographic display.

7. The full-space near-field and far-field control method based on coherent pixel metasurface according to claim 2, characterized in that: The single-layer metasurface is composed of nanobricks of the same size and different rotation angles, wherein superunit I is a transmission unit structure that can be used for transmission holographic reconstruction and transmission near-field high-value regulation; superunit II is a reflection unit structure that can be used for reflection holographic reconstruction and transmission near-field low-value regulation.

8. A method for full-space near-field and far-field control based on a coherent pixel metasurface according to any one of claims 1 to 7, characterized in that: Achieve full-space near-field and far-field control, while decoupling the transmitted light field and the reflected light field.

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