Augmented reality imaging system and method based on transmission and reflection integrated super-structure lens

Abstract

The invention discloses an augmented reality imaging system and method based on a transmission-reflection integrated super-structure lens, and relates to the technical field of super-structure optical imaging. The system comprises a display device, a transmission and reflection integrated super-structure lens and an imaging target, and the display device is used for decomposing a virtual image processed by a computer into red, green and blue light rays and projecting the red, green and blue light rays to the front surface of the transmission and reflection integrated super-structure lens in an oblique incidence mode; the transmission and reflection integrated super-structure lens reflects and focuses the red, green and blue light rays to an imaging target to form virtual image vision, meanwhile, real scene light rays incident from the back of the super-structure lens are transmitted to the imaging target to form real scene vision, and the virtual image vision and the real scene vision are fused to provide an augmented reality effect. According to the invention, the problems of low efficiency and unbalanced three-color efficiency of the existing AR equipment are solved, and the readability of the AR equipment in a scene with relatively strong ambient light is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of meta-optical imaging, and in particular to an optical imaging system and method based on a transflective integrated meta-lens. Background Art

[0002] A metalens is an ultra-thin two-dimensional planar device made of a metasurface (a planar two-dimensional material with a subwavelength scale) according to a design method for focusing light, and uses a subwavelength-scale nanostructure to focus and image the light. By rationally designing the geometric parameters of the nanounits, the metalens regulates the amplitude, phase, and polarization of the incident light, and can build the required optical system in a compact space. Compared with traditional optical lenses, metalens can perform more complex and precise phase regulation of transmitted and reflected light. For phase regulation tasks that are difficult to accomplish with traditional optical lenses, metalens can be easily accomplished through reasonable design. Due to its advantages such as lightness, easy integration, and reliance on semiconductor manufacturing processes, metalens have broad prospects in application fields such as integrated optoelectronic devices, super-resolution microscopes, and wearable optical display devices.

[0003] Augmented Reality (AR) is a display technology that combines computer-processed virtual images with real scene light. The optical system is the most important component of AR devices. It is required to be transparent to the real scene light while being able to project the computer-processed virtual images into the human eye, so that users can get an augmented reality visual experience that blends the real scene with the virtual image.

[0004] However, existing augmented reality optical system solutions, such as free-form surface design, diffractive optical elements (DOEs), surface relief gratings (SRGs), holographic optical elements (HOEs), etc., are often accompanied by large chromatic aberration, small field of view, low efficiency, unbalanced RGB efficiency, and large optical system volume. Therefore, a new solution is needed to meet the requirements of augmented reality optical system such as achromatic aberration, large field of view, high efficiency, balanced red / green / blue (RGB) efficiency, and lightweight. Summary of the invention

[0005] In order to overcome the problems of large chromatic aberration, small field of view, low efficiency, unbalanced RGB three-color efficiency, and excessive volume in the prior art augmented reality optical system, the present invention proposes an augmented reality imaging system and method based on a transflective integrated meta-lens, which solves the problems of low efficiency and unbalanced three-color efficiency of existing AR devices and improves the readability of AR devices in scenes with strong ambient light.

[0006] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0007] A transflective integrated meta-lens comprises a meta-lens nanostructure, a three-wavelength notch filter film layer and a meta-lens substrate connected in sequence, wherein:

[0008] The meta-lens nanostructure is used to adjust the reflection phase of red, green and blue light to achieve achromatic focusing;

[0009] The three-wavelength notch filter film layer is used to enhance the reflectivity of red, green and blue light, while improving the transmittance of other wavelengths of light;

[0010] The meta-lens substrate supports the meta-lens nanostructure and the three-wavelength notch filter film layer, and allows real scene light to be transmitted through to the imaging target to form real scene vision.

[0011] Preferably, the geometric parameters of the metalens nanostructure are designed based on the following hyperbolic phase equation, expressed as:

[0012]

[0013] Where (x, y) represents the orientation of the nanostructure on the front surface of the metalens; λ i represents the design wavelength; f represents the focal length when the transflective integrated meta-lens reflects and focuses the light; Indicates additional phase.

[0014] In the above technical solution, the phase design of the hyperbolic phase is used to adjust the geometric parameters of the nanostructure, which can provide high focusing efficiency and good achromatic effect for the metalens. The phase design equation can be changed according to different focal length requirements or imaging requirements, and then the geometric parameters of the nanostructure in the metalens are adjusted according to the phase equation, thereby controlling the optical performance of the metalens. It should be emphasized that modifying the geometric parameters of the nanounit can change the phase regulation effect of the metalens on the reflected light beam, and in the design process, the nanounit needs to be combined with the three-wavelength notch filter film layer and the metalens substrate, and the three are combined as a whole for optimization design. Any solution that first designs the phase regulation effect of the nanounit and then combines it with the film layer and substrate is not applicable to this technical solution.

[0015] Preferably, the three-wavelength notch filter film layer is a multi-layer alternating material structure, and its reflection bandwidth is designed to be narrow band to minimize the impact on the transmittance of real scene light.

[0016] In the above technical solution, the three-wavelength notch filter film layer is used to enhance the reflectivity of obliquely incident red, green and blue light rays, and enhance the transmittance of light rays of other wavelengths. The three-wavelength notch filter film layer is designed as a multi-layer alternating material structure, so that the integrated transflective meta-lens can efficiently and evenly reflect the red, green and blue light rays emitted by the display device while remaining transparent to the ambient light, so that the AR device can be used normally under strong ambient light. The reflection bandwidth of the three-wavelength notch filter film layer is designed to be a narrow band, which can effectively ensure that the meta-lens can efficiently reflect the three-color light beams emitted by the display device while minimizing the impact on the transmitted real scene light, thereby restoring the real scene in the imaging target.

[0017] Preferably, the numerical aperture of the integrated transflective meta-lens is controlled by adjusting the reflective focal length and / or the meta-lens aperture, wherein:

[0018] When the reflection focal length is fixed, the larger the metalens aperture, the larger the numerical aperture;

[0019] When the meta-lens aperture is fixed, the smaller the reflection focal length, the larger the numerical aperture.

[0020] Preferably, the shape of the metalens nanostructure includes at least one of a cylinder, a square cylinder or a ring cylinder, and its geometric parameters are dynamically adjusted according to the phase control requirements.

[0021] Preferably, the shape of the metalens nanostructure is a square column with a variable side length and axially rotated by 45°.

[0022] In the above technical solution, the shape of the meta-lens nanostructure is designed to include at least one of a cylinder, a square column or a ring column, and a certain angle is designed for the square column, which can better ensure that the meta-lens can efficiently reflect the three-color light beams emitted by the display device while minimizing the impact on the transmitted real scene light, thereby restoring the real scene in the imaging target.

[0023] Preferably, the scale of the meta-lens nanostructure is on the sub-wavelength order.

[0024] In the above technical solution, the thickness of the integrated transflective meta-lens is designed to be sub-wavelength, which enables the system to integrate the two functions of transparency to real scene light and regulation of virtual image light into the ultra-thin two-dimensional device of the meta-lens without the need for other optical elements, thereby greatly reducing the size of the AR device.

[0025] Preferably, the additional phase It is used to compensate for the phase difference caused by the oblique incidence of light. The expression is:

[0026]

[0027] Wherein, θ represents the incident angle of the red, green, and blue light rays of the display device projected onto the meta-lens.

[0028] An augmented reality imaging system based on a transflective integrated meta-lens, the system comprising:

[0029] Display device, transflective integrated meta-lens, and imaging target, wherein:

[0030] The display device is used to decompose the virtual image processed by the computer into red, green and blue light rays, and project them onto the front surface of the integrated transflective meta-lens in an oblique incidence manner;

[0031] The integrated transflective meta-lens reflects and focuses the red, green and blue light rays to an imaging target to form a virtual image vision, and at the same time transmits the real scene light incident from the back of the meta-lens to the imaging target to form a real scene vision. The virtual image vision and the real scene vision are blended to provide an augmented reality effect.

[0032] In the above technical solution, the display device decomposes the virtual image processed by the computer into red, green and blue light rays, which are incident obliquely on the front surface of the transmissive-reflective integrated meta-lens; the transmissive-reflective integrated meta-lens reflects and focuses the three-color light rays into the imaging target to form a virtual image vision; the real scene light can be transmitted through the back of the meta-lens without hindrance and incident on the imaging target to form a real scene vision; in the imaging target, the real scene and the virtual image blend to provide an augmented reality visual effect; effectively optimize the achromatic imaging effect and field of view of the AR optical system, improve the efficiency of the AR optical system, achieve the effect of balanced RGB three-color efficiency, and enable the AR device to be used normally under strong ambient light, and greatly reduce the volume of the optical system of the AR device. The present invention focuses on solving the problems of low efficiency and unbalanced three-color efficiency of existing AR devices, and improves the readability of AR devices in scenes with strong ambient light.

[0033] An augmented reality imaging method based on a transflective integrated meta-lens, the method comprising the following steps:

[0034] The display device decomposes the virtual image into red, green and blue light rays and obliquely incident on the front surface of the meta-lens nanostructure;

[0035] The three-color light is achromatically reflected and focused to an imaging target through a meta-lens nanostructure to form a virtual image vision;

[0036] The real scene light is transmitted through the substrate surface of the meta-lens substrate and visually merged with the virtual image to form an augmented reality visual effect.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention proposes an augmented reality imaging system and method based on a transflective integrated meta-lens, wherein a virtual image processed by a computer is decomposed into red, green and blue light rays through a display device, and the light rays are obliquely incident on the front surface of the transflective integrated meta-lens; the transflective integrated meta-lens reflects and focuses the three-color light rays into an imaging target to form a virtual image vision; the real scene light rays can be transmitted through the back of the meta-lens without hindrance and incident on the imaging target to form a real scene vision; in the imaging target, the real scene and the virtual image blend to provide an augmented reality visual effect; the achromatic imaging effect and the field of view of the AR optical system are effectively optimized, the efficiency of the AR optical system is improved, the RGB three-color efficiency is balanced, and the AR device can be used normally under strong ambient light, and the volume of the optical system of the AR device is greatly reduced. The present invention focuses on solving the problems of low efficiency and unbalanced three-color efficiency of existing AR devices, and improves the readability of the AR device in scenes with strong ambient light. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a transflective integrated meta-lens micro-nano structure provided in an embodiment of the present application;

[0040] Figure 2 A top view of the integrated transflective meta-lens nanostructure provided in an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the structure of an augmented reality imaging system based on a transflective integrated meta-lens provided in an embodiment of the present application;

[0042] Figure 4 A flowchart of an augmented reality imaging method based on a transflective integrated meta-lens provided in an embodiment of the present application;

[0043] In the figure: 1-display device; 2-transmissive and reflective integrated meta-lens; 21-meta-lens reflected and focused light; 22-meta-lens reflected and focused focal length; 3-imaging target; 4-real scene light; 5-nanostructure; 6-three-wavelength notch filter film layer; 7-meta-lens substrate. DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0045] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] Embodiment 1:

[0048] This embodiment provides a transflective integrated meta-lens. Figure 1 The transflective integrated meta-lens 2 comprises a meta-lens nanostructure 5, a three-wavelength notch filter film layer 6 and a meta-lens substrate 7 connected in sequence, wherein:

[0049] The meta-lens nanostructure 5 is used to adjust the reflection phase of red, green and blue light to achieve achromatic focusing;

[0050] The three-wavelength notch filter film layer 6 is used to enhance the reflectivity of red, green and blue light, while improving the transmittance of other wavelengths of light;

[0051] The metalens substrate 7 supports the metalens nanostructure 5 and the three-wavelength notch filter film layer 6, and allows the real scene light 4 to be transmitted through to the imaging target 3 to form real scene vision.

[0052] The imaging target 3 in the present invention is set as the human eye, but is not limited to the human eye, and may also be other visual devices.

[0053] Specifically, the transmissive-reflective integrated meta-lens 2 includes a meta-lens nanostructure 5, a three-wavelength notch filter film layer 6, and a meta-lens substrate 7. The meta-lens nanostructure 5 is located on the front surface of the transmissive-reflective integrated meta-lens 2, and has a sub-wavelength size. The shape and geometric parameters of the nanostructure can be changed according to the phase equation of the meta-lens reflection focusing, and is used to adjust the phase of the three-color light emitted by the display device to the front surface of the meta-lens, so that the three-color light can achieve the effect of achromatic focusing after reflection; the three-wavelength notch filter film layer 6 is used to enhance the reflectivity of the oblique incident red, green, and blue light, and enhance the transmittance of other wavelengths of light, so that the transmissive-reflective integrated meta-lens 2 can efficiently and evenly reflect the red, green, and blue light emitted by the display device, while remaining transparent to the ambient light, so that the AR device can be used normally under strong ambient light; the meta-lens substrate 7 is the starting point of the meta-lens processing, and has a certain protective effect on the meta-lens after the meta-lens is manufactured.

[0054] The transmission effect of the integrated transflective meta-lens 2 on the real scene light is affected by the three-wavelength notch filter film layer 6 in the meta-lens. In detail, while the three-wavelength notch filter film layer 6 ensures the high reflectivity of the three wavelengths of red, green and blue, it also limits the transmittance of the meta-lens at the three corresponding wavelengths. At this time, it is necessary to reduce the reflection bandwidth of the three-wavelength notch filter film layer 6 as much as possible in the design, to ensure that the meta-lens can efficiently reflect the three-color light beam emitted by the display device, while minimizing the impact on the transmitted real scene light, so as to restore the real scene in the imaging target 3.

[0055] As a preferred embodiment, the geometric parameters of the meta-lens nanostructure 5 are designed based on the following hyperbolic phase equation, expressed as:

[0056]

[0057] Where (x, y) represents the orientation of the nanostructure on the front surface of the metalens; λ i represents the design wavelength; f represents the focal length when the transflective integrated meta-lens reflects and focuses the light; Indicates additional phase.

[0058] As a preferred embodiment, the additional phase It is used to compensate for the phase difference caused by the oblique incidence of light. The expression is:

[0059]

[0060] Wherein, θ represents the incident angle of the red, green, and blue light rays of the display device projected onto the meta-lens.

[0061] It can be understood that the use of hyperbolic phase phase design to adjust the geometric parameters of the nanostructure can provide high focusing efficiency and good achromatic effect for the meta-lens. The phase design equation can be changed according to different focal length requirements or imaging requirements, and then the geometric parameters of the nanostructure in the meta-lens can be adjusted according to the phase equation to control the optical performance of the meta-lens. It should be emphasized that modifying the geometric parameters of the nano-unit can change the phase regulation effect of the meta-lens on the reflected light beam, and in the design process, the nano-unit needs to be combined with the three-wavelength notch filter film layer and the meta-lens substrate. The three are combined as a whole for optimization design. Any solution that first designs the phase regulation effect of the nano-unit and then combines it with the film layer and substrate is not applicable to the present technical solution.

[0062] As a preferred embodiment, the three-wavelength notch filter film layer 6 is a multi-layer alternating material structure, and its reflection bandwidth is designed to be narrow to minimize the impact on the transmittance of the real scene light 4.

[0063] It can be understood that the three-wavelength notch filter film layer is used to enhance the reflectivity of the obliquely incident red, green and blue light rays, and enhance the transmittance of light rays of other wavelengths. The three-wavelength notch filter film layer is designed as a multi-layer alternating material structure, so that the integrated transflective meta-lens can efficiently and evenly reflect the red, green and blue light rays emitted by the display device while remaining transparent to the ambient light, so that the AR device can be used normally under strong ambient light. The reflection bandwidth of the three-wavelength notch filter film layer is designed to be a narrow band, which can effectively ensure that the meta-lens can efficiently reflect the three-color light beams emitted by the display device while minimizing the impact on the transmitted real scene light, thereby restoring the real scene in the imaging target.

[0064] As a preferred embodiment, the field of view of the integrated transflective metalens 2 is positively correlated with the numerical aperture of the metalens, and the numerical aperture is controlled by adjusting the reflection focal length 22 and / or the metalens aperture, wherein:

[0065] When the reflection focal length is fixed at 22, the larger the meta-lens aperture, the larger the numerical aperture;

[0066] When the meta-lens aperture is fixed, the smaller the reflection focal length 22 is, the larger the numerical aperture is.

[0067] Specifically, the field of view angle of the reflective focusing virtual image of the augmented reality imaging system based on the integrated transflective metalens is related to the numerical aperture of the reflective focusing of the metalens, that is, the larger the numerical aperture of the reflective focusing of the metalens, the larger the field of view angle of the augmented reality imaging system, and vice versa. The numerical aperture of the reflective focusing of the metalens can be changed by adjusting the focal length of the reflective focusing and the aperture of the metalens. In detail, under the same reflective focusing focal length, the larger the aperture of the metalens, the larger the numerical aperture of the reflective focusing of the metalens, and vice versa; and in the case of a fixed aperture of the metalens, the smaller the focal length of the reflective focusing, the larger the numerical aperture of the reflective focusing, and vice versa.

[0068] As a preferred embodiment, see Figure 2 The shape of the meta-lens nanostructure 5 includes at least one of a cylinder, a square column or a ring column. In practical applications, the geometric shape and parameters of the meta-lens nanostructure 5 are dynamically adjusted according to the phase control requirements.

[0069] As a preferred embodiment, see Figure 2 The shape of the meta-lens nanostructure 5 is a square column with a variable side length and an axial rotation of 45°.

[0070] Specifically, see Figure 2 The three nanostructures shown in the figure are a cylinder with a variable diameter D, a square cylinder with a variable side length L and an axial rotation of 45°, and a circular cylinder with a variable inner diameter D1 and outer diameter D2. The parameters of the three structures can be adjusted according to the phase design results. According to different design requirements, the types of nanostructures can be added or reduced. The three structures here are only examples. Practical applications may include but are not limited to these three types.

[0071] It can be understood that selecting appropriate nanostructure shapes and parameters according to phase requirements can better ensure that the meta-lens can efficiently reflect the three-color light beams emitted by the display device while minimizing the impact on the transmitted real scene light, thereby restoring the real scene in the imaging target.

[0072] As a preferred embodiment, the scale of the meta-lens nanostructure 5 of the integrated transmissive and reflective meta-lens 2 is on the sub-wavelength order.

[0073] Specifically, the achromatic effect and high efficiency of the augmented reality imaging system based on the integrated transflective metalens 2 come from the efficient reflection and focusing of the red, green and blue light beams by the metalens; the portability of the system is due to the functional integration and ultra-thin thickness of the integrated transflective metalens 2, that is, the two functions of being transparent to the real scene light and regulating the virtual image light are integrated into the ultra-thin two-dimensional device of the metalens without the need for other optical elements, thereby greatly reducing the volume of the AR device.

[0074] It can be understood that the scale of the meta-lens nanostructure of the integrated transmissive and reflective meta-lens is designed to be sub-wavelength, which enables the system to integrate the two functions of transparency to real scene light and regulation of virtual image light into the ultra-thin two-dimensional device of the meta-lens without the need for other optical elements.

[0075] In this embodiment, see Figure 3 The shape and parameters of the meta-lens nanostructure 5 are designed according to the hyperbolic phase equation of the transmissive-reflective integrated meta-lens 2. In the design process, the meta-lens nanostructure 5, the three-wavelength notch filter film layer 6, and the meta-lens substrate 7 must be combined for optimization. According to different regulation requirements, the phase equation design of the transmissive-reflective integrated meta-lens 2 can be adjusted, and then the shape and parameters of the meta-lens nanostructure 5 are changed according to the phase equation to match different phase equations. The three-wavelength notch filter film layer 6 has a multi-layer film structure, which is composed of different materials alternately. The number of layers and material types in the figure are only examples. In the implementation process, it can be replaced with a variety of materials, and the number of designed film layers can also be freely changed according to design requirements. The three-wavelength notch filter film layer 6 is used to enhance the reflectivity of red, green, and blue light, improve the reflection focusing efficiency of the transmissive-reflective integrated meta-lens 2, and maintain high transmittance for other wavelengths, so that the real scene light 4 can reach the human eye 3 without hindrance. The metalens substrate 7 is the starting point of the metalens processing and plays a protective role after the metalens is manufactured. During the design process, it is combined with the metalens nanostructure 5 and the three-wavelength notch filter film layer 6 for optimization.

[0076] Embodiment 2:

[0077] This embodiment provides an augmented reality imaging system based on a transflective integrated meta-lens, see Figure 3 , the system comprising:

[0078] Display device 1, transflective integrated meta-lens 2, and imaging target 3, wherein:

[0079] The display device 1 is used to decompose the virtual image processed by the computer into red, green and blue light rays, and project them onto the front surface of the integrated transflective meta-lens 2 in an oblique incidence manner;

[0080] The integrated transflective meta-lens 2 reflects and focuses the red, green and blue light rays to the imaging target 3 to form a virtual image vision, and at the same time transmits the real scene light 4 incident from the back of the meta-lens to the imaging target 3 to form a real scene vision. The virtual image vision and the real scene vision are blended to provide an augmented reality effect.

[0081] The imaging target 3 in the present invention is set as the human eye, but is not limited to the human eye, and may also be other visual devices.

[0082] In this embodiment, see Figure 3 The display device 1 divides the virtual image processed by the computer into red, green and blue light rays, which are incident obliquely on the side of the transmissive-reflective integrated meta-lens 2 having the nanostructure. The light emitted by the display device 1 is parallel light, which is only an example and does not limit the present invention. In other practical situations, other light sources such as divergent light sources can be used for illumination. The meta-lens reflects and focuses the three-color light rays according to the phase design of reflection and focusing. The focused light rays are as follows: Figure 1 21 in the figure, the focal length of the reflected focus is shown as 22 in the figure, and then the light enters the human eye 3 to form a virtual image vision. In particular, the field of view angle of the virtual image vision is related to the numerical aperture of the reflected focus of the transmissive and reflective integrated meta-lens 2. The larger the numerical aperture, the larger the field of view angle, and the smaller the numerical aperture, the smaller the field of view angle. This numerical aperture can be changed by adjusting the aperture of the meta-lens and the focal length 22 of the reflected focus. The larger the aperture of the meta-lens and / or the smaller the focal length of the reflected focus, the larger the numerical aperture. The real scene light 4 is incident from the back side of the transmissive and reflective integrated meta-lens 2, that is, the substrate side, and is transmitted through unimpeded and reaches the human eye 3 to form a real scene vision, thereby blending with the virtual image to provide the user with an augmented reality visual experience.

[0083] In this embodiment, the display device decomposes the virtual image processed by the computer into red, green and blue light rays, which are incident obliquely on the front surface of the integrated transmissive and reflective meta-lens; the integrated transmissive and reflective meta-lens reflects and focuses the three-color light rays into the human eye to form a virtual image vision; the real scene light can be transmitted through the back of the meta-lens without hindrance and incident on the human eye to form a real scene vision; in the human eye, the real scene and the virtual image blend to provide an augmented reality visual effect; effectively optimize the achromatic imaging effect and field of view of the AR optical system, improve the efficiency of the AR optical system, achieve the effect of RGB three-color efficiency balance, and enable the AR device to be used normally under strong ambient light, and greatly reduce the volume of the optical system of the AR device. The present invention focuses on solving the problems of low efficiency and unbalanced three-color efficiency of existing AR devices, and improves the readability of AR devices in scenes with strong ambient light.

[0084] Embodiment three:

[0085] This embodiment provides an augmented reality imaging method based on a transflective integrated meta-lens, see Figure 4 , the method comprises the following steps:

[0086] S1: The display device 1 decomposes the virtual image into red, green and blue light rays and obliquely incident on the front surface of the meta-lens nanostructure 5;

[0087] S2: The three-color light is achromatically reflected and focused to the imaging target 3 by the meta-lens nanostructure 5 to form a virtual image vision;

[0088] S3: The real scene light 4 is transmitted through the substrate surface of the meta-lens substrate 7 and visually merged with the virtual image to form an augmented reality visual effect.

[0089] Specifically, the display device 1 divides the virtual image obtained after computer processing into red, green and blue light and emits it into the air. The red, green and blue light emitted by the display device 1 is obliquely incident on the front surface of the transmissive-reflective integrated meta-lens 2 with a nanostructure, and is reflected and focused by the transmissive-reflective integrated meta-lens 2. The transmissive-reflective integrated meta-lens 2 reflects and focuses the virtual image processed by the computer into the imaging target 3 to form a virtual image vision. While the virtual image is reflected and focused, the real scene light 4 is incident from the back side of the transmissive-reflective integrated meta-lens 2, that is, one side of the substrate. The real scene light 4 is transmitted through the meta-lens and enters the imaging target to form a real scene vision. In the imaging target 3, the real scene light 4 blends with the virtual image, and the user obtains an augmented reality visual experience.

[0090] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A transflective integrated meta-lens, characterized in that: The invention comprises a meta-lens nanostructure (5), a three-wavelength notch filter film layer (6) and a meta-lens substrate (7) which are connected in sequence, wherein: The meta-lens nanostructure (5) is used to adjust the reflection phase of red, green and blue light to achieve achromatic focusing; The three-wavelength notch filter film layer (6) is used to enhance the reflectivity of red, green and blue light, while improving the transmittance of light of other wavelengths; The meta-lens substrate (7) supports the meta-lens nanostructure (5) and the three-wavelength notch filter film layer (6), and allows real scene light (4) to be transmitted through to the imaging target (3) to form real scene vision.

2. The transmissive and reflective integrated meta-lens according to claim 1, characterized in that: The geometric parameters of the meta-lens nanostructure (5) are designed based on the following hyperbolic phase equation, expressed as: Where (x, y) represents the orientation of the nanostructure on the front surface of the metalens; λ i represents the design wavelength; f represents the focal length of the transflective integrated meta-lens when reflecting and focusing the light; Indicates additional phase.

3. The transmissive-reflective integrated meta-lens according to claim 1, characterized in that: The three-wavelength notch filter film layer (6) is a multi-layer alternating material structure, and its reflection bandwidth is designed to be narrow to minimize the impact on the transmittance of the real scene light (4).

4. The transmissive and reflective integrated meta-lens according to claim 1, characterized in that: The numerical aperture of the integrated transflective meta-lens is controlled by adjusting the reflection focal length (22) and / or the meta-lens aperture, wherein: When the reflection focal length (22) is fixed, the larger the meta-lens aperture, the larger the numerical aperture; When the meta-lens aperture is fixed, the smaller the reflection focal length (22), the larger the numerical aperture.

5. The transmissive and reflective integrated meta-lens according to claim 1, characterized in that: The shape of the meta-lens nanostructure (5) includes at least one of a cylinder, a square cylinder or a circular cylinder, and its geometric parameters are dynamically adjusted according to phase control requirements.

6. The transmissive and reflective integrated meta-lens according to claim 1, characterized in that: The shape of the meta-lens nanostructure (5) is a square column with a variable side length and an axial rotation of 45°.

7. The integrated transmissive and reflective meta-lens according to claim 1, characterized in that: The scale of the meta-lens nanostructure (5) is at the sub-wavelength level.

8. The integrated transmissive and reflective meta-lens according to claim 2, characterized in that: The additional phase It is used to compensate for the phase difference caused by the oblique incidence of light. The expression is: Wherein, θ represents the incident angle of the red, green, and blue light rays of the display device projected onto the meta-lens.

9. An augmented reality imaging system based on a transflective integrated meta-lens, characterized in that: The system comprises: A display device (1), a transflective integrated meta-lens (2), and an imaging target (3), wherein: The display device (1) is used to decompose the virtual image processed by the computer into red, green and blue light rays, and project them onto the front surface of the integrated transflective meta-lens (2) in an oblique incidence manner; The integrated transflective meta-lens (2) reflects and focuses the red, green and blue light rays to an imaging target (3) to form a virtual image vision, and at the same time transmits the real scene light rays (4) incident from the back of the meta-lens to the imaging target (3) to form a real scene vision. The virtual image vision and the real scene vision are blended to provide an augmented reality effect.

10. An augmented reality imaging method based on a transflective integrated meta-lens, characterized in that: The method comprises the following steps: The display device (1) decomposes the virtual image into red, green and blue light rays and obliquely incident the light rays onto the front surface of the meta-lens nanostructure (5); The three-color light is achromatically reflected and focused onto an imaging target (3) by a meta-lens nanostructure (5), thereby forming a virtual image vision; The real scene light (4) is transmitted through the substrate surface of the meta-lens substrate (7) and visually merged with the virtual image to form an augmented reality visual effect.

Images