Brightening and magnifying imaging device based on super-structure lens array

Abstract

The utility model provides a brightening and magnifying imaging device based on a super-structure lens array, which comprises a plurality of image light-emitting arrays, a first lens module and a second lens module which are sequentially arranged along the light propagation direction, the first lens module can regulate and control the phase and the amplitude of an incident beam, the second lens module is arranged at the downstream of a light path of the first lens module, and the second lens module is arranged at the downstream of a light path of the second lens module. According to the utility model, after the image light-emitting array realizes shaping and convergence of distributed light beams through the lens module I, achromatic convergence and amplification are carried out on the regulated light beams through the lens module I and the lens module II, and finally an amplified image is formed. The problems that in the using process of the super-structure lens, due to the fact that a single super-structure lens is limited by the focal length and the size in the aspects of brightening and magnifying imaging, the occupied space is large, and the super-structure lens cannot be suitable for high-resolution imaging in a small space are solved.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging equipment technology, specifically to a brightness enhancement and magnification imaging device based on a meta-lens array. Background Technology

[0002] In the field of optical imaging, traditional imaging systems face numerous challenges in achieving high-resolution, large-field-of-view, and high-brightness imaging. For example, traditional microscopes rely on multiple objectives to achieve different magnifications, resulting in large size, complex structure, and high cost, making them difficult to integrate into compact devices. Furthermore, during the imaging process, light undergoes multiple refractions and reflections, leading to significant energy loss and insufficient image brightness.

[0003] The emergence of metalenses has provided a new approach to solving these problems. Metalenses use subwavelength meta-unit structures to control parameters such as light field amplitude, phase, spectrum, and polarization. They are characterized by being ultra-thin, planar, easy to integrate, and mass-producible. However, currently, the performance of a single metalens in terms of brightness enhancement and magnification imaging is limited by focal length and size, resulting in slightly insufficient performance in achieving high-resolution magnification imaging in a compact and narrow space. How to achieve high-resolution magnification imaging in a narrow space has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present invention provides a brightness enhancement and magnification imaging device based on a meta-lens array, which can achieve efficient magnification and display of images without sacrificing resolution or increasing the system working distance through the synergistic effect of the image light-emitting array, lens module one, and lens module two.

[0005] To address the aforementioned technical problems, this invention provides a brightness enhancement and magnification imaging device based on a meta-lens array. The device includes multiple image emission arrays arranged sequentially along the light propagation direction, a lens module one, and a lens module two. Lens module one can control the phase and amplitude of the incident light beam. Lens module two is located downstream of the optical path of lens module one. This invention allows the image emission arrays to shape and converge the distributed light beam through lens module one, and then the controlled beam is achromatic converged and magnified through lens modules one and two, ultimately forming a magnified image. This invention solves the problem that meta-lenses, due to the limitations of focal length and size in brightness enhancement and magnification, require a large footprint and are unsuitable for high-resolution imaging in small spaces.

[0006] Lens module one is a microlens array, which includes multiple convex lens arrays or multiple concave-convex lens arrays.

[0007] Lens module one is a meta-lens array, which includes multiple subwavelength structural units.

[0008] The shape of the subwavelength structural unit is a nanopillar, a nanopore, a nanofin, or a combination thereof.

[0009] Lens module two is positioned after lens module one. Lens module two is a combination of one or more concave and convex lenses used to adjust the propagation path and intensity distribution of the light beam.

[0010] Lens module two is positioned after lens module one. Lens module two is a combination of one or more metalenses used to adjust the propagation path and intensity distribution of the light beam.

[0011] Lens module two is located after lens module one. Lens module two is a combination of multiple concave and convex lenses and meta-lenses used to adjust the propagation path and intensity distribution of the light beam.

[0012] The imaging device also includes an imaging sensor or a human eye. The imaging sensor is located downstream of the optical path of the second lens module and is used to receive the beam of light magnified by the second lens module and convert it into an electrical signal or a digital signal.

[0013] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0014] 1. Adjusting beam brightness and reducing device footprint: This invention can achieve preliminary control of the beam through a meta-lens array, effectively improving light utilization and increasing image brightness. Simultaneously, the planar shape and easy integration of the meta-lens array make the device more compact and smaller in size.

[0015] 2. Wider and clearer imaging range: This invention can achieve a higher magnification by using a lens module, such as a convex lens, to further converge and magnify the image, enabling clear observation of the details of tiny objects.

[0016] 3. Reduce astigmatic interference and further improve image clarity: This utility model can reduce stray light interference by setting up lens module two, thereby improving the contrast and clarity of the image and significantly improving the image quality.

[0017] 4. Facilitates the reception, display, and analysis of imaging effects: This invention can easily convert optical signals into processable electrical or digital signals through the setting of the imaging sensor, which facilitates subsequent image analysis and processing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the brightness enhancement and magnification imaging device based on metalens array of this utility model.

[0019] Explanation of reference numerals in the attached figures: 100, image emitting array; 200, lens module one; 300, lens module two; 400, imaging sensor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0021] like Figure 1 As shown: This embodiment provides a brightness enhancement and magnification imaging device based on a meta-lens array, including multiple image light-emitting arrays 100, a lens module 200, and a lens module 300 arranged sequentially along the light propagation direction. The lens module 200 can control the phase and amplitude of the incident light beam, and the lens module 300 is located downstream of the optical path of the lens module 200. This invention can shape and converge the distributed light beam through the image light-emitting arrays 100 via the lens module 200, and then pass through the lens module 200 and the lens module 300. The second 300 performs achromatic focusing and amplification on the regulated light beam to ultimately form a magnified image. This utility model can achieve the shaping and focusing of distributed light beams through multiple image light emission arrays 100, followed by achromatic focusing and amplification of the regulated light beams through lens module 200 and lens module 300 to ultimately form a magnified image. This solves the problem that in the use of metalenses, the single metalens is limited by focal length and size in terms of brightness enhancement and magnification imaging, resulting in a large footprint and inability to be used for high-resolution imaging in small spaces.

[0022] Lens module 1200 is a microlens array, which includes multiple convex lens arrays or multiple concave-convex lens arrays.

[0023] Lens Module 1200 is a meta-lens array, which includes multiple subwavelength structural units. The subwavelength structural units are made of silicon oxide and titanium dioxide, and their shapes are nanopillars, nanopores, nanofins, or combinations thereof. The meta-lens array is composed of square units with a side length of 50 μm arranged periodically. Each unit contains an array of titanium dioxide nanopillars. The working wavelength is visible. The meta-lens array is used to control the phase and amplitude of the incident beam.

[0024] According to another embodiment of the present invention, such as Figure 1 Lens module 200 is disposed after lens module 200. Lens module 200 is a combination of one or more concave and convex lenses used to adjust the propagation path and intensity distribution of the light beam. This invention can suppress stray light and optimize the point spread function through lens module 200.

[0025] Another implementation of lens module 2 300 is a combination of one or more metalenses used to adjust the propagation path and intensity distribution of the light beam.

[0026] Another implementation of lens module 2 300 is a combination of multiple concave and convex lenses and meta-lenses used to adjust the propagation path and intensity distribution of the light beam.

[0027] The imaging device also includes an imaging sensor 400 or a human eye. The imaging sensor 400 is located downstream of the optical path of the lens module 2 300 and is used to receive the beam of light magnified by the lens module 2 300 and convert it into an electrical signal or a digital signal.

[0028] The imaging device also includes a second lens module 300, which is disposed after the first lens module 200 and is used to adjust the propagation path and intensity distribution of the light beam. This invention can suppress stray light and optimize the point spread function through the second lens module 300.

[0029] The imaging device also includes an imaging sensor 400, which is located downstream of the optical path of the second lens module 300. The imaging sensor 400 is used to receive the beam of light magnified by the second lens module 300 and convert it into an electrical signal or a digital signal. This invention can display the controlled beam of light through the imaging device, making the operation more convenient.

[0030] How to use this utility model:

[0031] First, it needs to be clarified that the imaging device involved in this utility model is mainly used for focusing and diverging light beams and imaging display operations. It can be integrated into portable reality devices, such as watches, AR glasses, miniature projectors, medical endoscopes, etc. This utility model takes the combination of image light emission array 100 with lens module 1 200 and lens module 2 300 to achieve stable and clear imaging as an example to describe its usage method in detail. When imaging operations are required, the following steps are followed: Preparation of lens module 1 200: Electron beam lithography is used to prepare metalens units on a substrate material. A suitable substrate material, such as silicon dioxide, is selected, and electron beam photoresist is uniformly coated on the substrate. According to the designed metalens unit structure, a pattern of nanopillars is etched on the photoresist using electron beam lithography. The height, diameter, and spacing of the nanopillars are precisely designed according to the required light field control effect. Then, the photoresist pattern is transferred to the substrate material through an etching process to form a metalens unit. Multiple metalens units are assembled into a metalens array in a matrix arrangement. Assembly of the imaging device: Multiple prepared lens modules 200 are fixed on the support according to the designed matrix arrangement, ensuring precise alignment of each metalens array. On the light-emitting side of lens module 200, lens module 300 is installed. The aperture size of lens module 300 is selected according to actual needs (e.g., an aperture between 0.5-2mm) to control the light propagation path and intensity distribution. On the light-emitting side of lens module 300, a convex lens is installed. The convex lens thickness is less than 3mm, the focal length is 10mm, and the distance between the convex lens and the metalens array is 5mm. This achieves 2x image magnification with a resolution better than 200 lp / mm. The focal length of the convex lens is selected according to the required magnification. On the light-emitting side of the convex lens, an imaging sensor 400 is installed. The distance between the imaging sensor 400 and the convex lens is adjusted according to the imaging formula to ensure a clear image.

[0032] Imaging Process: The light beam enters from the left side of the device and first passes through an influence light emission array. The influence light emission array converges the beam to lens module 200, which modulates the phase and amplitude of the beam, making the light more concentrated and ordered. The light, after being modulated by lens module 200, enters lens module 300, which blocks some stray light, allowing only light of specific direction and intensity to pass through. The light passing through lens module 300 then enters a convex lens, which converges and magnifies the light, projecting the magnified image of the object onto the imaging sensor 400. The imaging sensor 400 converts the received light into an electrical or digital signal. After subsequent signal processing and image reconstruction, a clear, brightened, and magnified image is obtained.

[0033] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A brightness enhancement and magnification imaging device based on a metalens array, characterized in that: It includes multiple image light-emitting arrays (100), lens module one (200) and lens module two (300) arranged sequentially along the light propagation direction. Lens module one (200) can control the phase and amplitude of the incident light beam. Lens module two (300) is located downstream of the optical path of lens module one (200) and is used to receive the light beam after being controlled by the meta-lens array, and to converge and amplify the controlled light beam to form a magnified image.

2. The brightness enhancement and magnification imaging device based on a meta-lens array as described in claim 1, characterized in that: The lens module one (200) is a microlens array, which includes multiple convex lens arrays or multiple concave-convex lens arrays.

3. The brightness enhancement and magnification imaging device based on a meta-lens array as described in claim 1, characterized in that: The lens module one (200) is a meta-lens array, which includes multiple subwavelength structural units.

4. The brightness enhancement and magnification imaging device based on a meta-lens array as described in claim 3, characterized in that: The shape of the subwavelength structural unit is a nanopillar, a nanopore, a nanofin, or a combination thereof.

5. The brightness enhancement and magnification imaging device based on a meta-lens array as described in claim 1, characterized in that: The second lens module (300) is positioned after the first lens module (200). The second lens module (300) is a combination of one or more concave and convex lenses used to adjust the propagation path and intensity distribution of the light beam.

6. The brightness enhancement and magnification imaging device based on a meta-lens array as described in claim 1, characterized in that: The second lens module (300) is positioned after the first lens module (200), and the second lens module (300) is a combination of one or more metalenses used to adjust the propagation path and intensity distribution of the light beam.

7. The brightness enhancement and magnification imaging device based on a meta-lens array as described in claim 1, characterized in that: The second lens module (300) is positioned after the first lens module (200). The second lens module (300) is a combination of multiple concave and convex lenses and meta-lenses used to adjust the propagation path and intensity distribution of the light beam.

8. The brightness enhancement and magnification imaging device based on a meta-lens array as described in claim 1, characterized in that: The imaging device also includes an imaging sensor (400) or a human eye. The imaging sensor (400) is located downstream of the optical path of the lens module two (300) and is used to receive the beam of light magnified by the lens module two (300) and convert it into an electrical signal or a digital signal.

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