CN218455807U - Compact super-surface near-infrared imaging system - Google Patents
Compact super-surface near-infrared imaging system Download PDFInfo
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- CN218455807U CN218455807U CN202222850774.6U CN202222850774U CN218455807U CN 218455807 U CN218455807 U CN 218455807U CN 202222850774 U CN202222850774 U CN 202222850774U CN 218455807 U CN218455807 U CN 218455807U
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Abstract
The application relates to a compact super-surface near-infrared imaging system, which belongs to the technical field of optical lenses and comprises a lens, a structural support piece and an image sensor, wherein the lens and the image sensor are respectively fixed at two ends of the structural support piece; the lens sequentially comprises a diaphragm layer, an optical filtering layer, a substrate and a super surface layer, and the diaphragm layer is light-tight; the image sensor is used for receiving infrared rays. The imaging system reduces the size and the weight, reduces the size and the processing cost of the lens and is easy to integrate.
Description
Technical Field
The application belongs to the field of optical lenses, and particularly relates to a compact super-surface near-infrared imaging system.
Background
The near infrared is between visible light and mid-infrared light, and is invisible to the human eye. The near-infrared band scattering effect is large, the penetration depth is deep, the imaging range is wider compared with visible light, and the method is suitable for imaging in a low-illumination environment. It is therefore of great importance to use near-infrared light detection techniques to convert near-infrared light radiated by an object into an image visible to the human eye.
The traditional near-infrared imaging system mainly comprises a near-infrared optical system lens and an image sensor, and the near-infrared optical system lens is formed by combining a plurality of optical lenses, so that the problems that the near-red optical system is high in processing difficulty, high in manufacturing cost, large in size and difficult to integrate and the like are caused. These problems severely limit the large-scale application of near-infrared imaging systems.
SUMMERY OF THE UTILITY MODEL
The application provides a super surface near-infrared imaging system of compact to solve above technical problem that exists among the prior art at least.
The embodiment of the application provides a compact super-surface near-infrared imaging system, which comprises a lens, a structural support part and an image sensor, wherein the lens and the image sensor are respectively fixed at two ends of the structural support part; the lens sequentially comprises a diaphragm layer, an optical filtering layer, a substrate and a super surface layer, and the diaphragm layer is light-tight; the image sensor is used for receiving infrared rays.
In one embodiment, the optical filter layer has a center wavelength of 700-1100nm and a half-wave width of 50nm.
In one embodiment, the diaphragm layer is a light-tight film and is integrated outside the optical filter layer, and the light-tight film is matched with the diaphragm aperture.
In one embodiment, the super surface layer is composed of a micro-nano structure array.
In an implementation mode, the micro-nano structure array is composed of a plurality of nano columns or nano holes.
In one embodiment, the nanopore is one of a nanopore, and a nanopore;
the nano column is one of a nano cylinder, a nano triangular column and a nano cross column, the phase of the super surface layer is changed by changing the size and the arrangement of the nano column, and the phase change of the super surface layer is 0-2 pi.
In one embodiment, the phase calculation formula of the super surface layer is as follows:
in one embodiment, the phase calculation formula of the super surface layer is as follows:
wherein x and y are super surface atomic coordinates,
the wave vector is the wave vector,
for the field angle, f is the focal length of the designed superlens, and λ is the wavelength of the incident light.
In an implementation manner, the micro-nano structure array may be arranged in a square or hexagonal manner.
In one embodiment, the image sensor is one of a CCD, a CMOS and a near infrared camera.
Compared with the prior art, the method has the following advantages:
1. according to the imaging system, the micro-nano structure is adopted to modulate the phase to replace the traditional lens group, so that the size and the weight of the imaging system are reduced to a greater extent;
2. adopt the optical filter layer to replace the entity filter plate in this application to prepare the light tight film that matches with required diaphragm aperture outside the optical filter layer, optical filter layer and diaphragm layer are the film, replace traditional diaphragm and filter plate with two-layer film, reduced the size and the processing cost of camera lens by a wide margin, do benefit to the modularization integration.
Drawings
FIG. 1 is a schematic structural diagram of a compact super-surface near-infrared imaging system in embodiment 1 of the present application;
FIG. 2 is a schematic structural diagram of a compact super-surface near-infrared imaging system in embodiment 2 of the present application;
FIG. 3 is a diagram showing an optical path of an actual light beam in embodiment 1 of the present application;
FIG. 4 is a schematic diagram of a square and hexagonal arrangement of an embodiment of the present application;
FIG. 5 is a schematic diagram of a four-direction arrangement period according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a hexagonal packing period according to an embodiment of the present application;
description of reference numerals:
1. a diaphragm layer; 2. an optical filter layer; 3. a substrate; 4. a super-surface layer; 5. a structural support; 6. an image sensor.
Detailed Description
The present application will now be described in further detail with reference to the accompanying drawings.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.
In recent years, new technology has been extensively studied. A super-surface is a ground plane lens that uses a super-surface to focus light. The metasurface consists of a series of artificial antennas that can manipulate the optical response of the incident light arbitrarily, including its amplitude, phase and polarization. The technology can realize the same function as the traditional lens, the processing difficulty is reduced, the processing cost is correspondingly reduced, and the integration level is greatly improved. Therefore, the use of the super surface to replace the lens of the near-infrared optical system is a key step for reducing the production cost of the near-infrared imaging system and improving the integration level of the near-infrared imaging system.
The recent near-infrared optical imaging system patent in the market (CN 215010478U) has reduced the size of the conventional optical system to some extent, but the integration level is still not high and the manufacturing cost is high. Therefore, it is an open problem to provide a near infrared imaging system with low manufacturing cost and high integration. The breakthrough of the technology can promote the near infrared imaging system to open a wider application market in the fields of vein detection, iris recognition, infrared guidance, vehicle-mounted night vision and the like.
In the design of this application super surperficial near-infrared imaging system of compact, the camera lens adopts hot vapor deposition method to replace traditional diaphragm and filter, and direct vapor deposition arrives super surperficial micro-nano structure's opposite side, can possess a plurality of advantages simultaneously, for example little volume, low cost, the technology degree of difficulty is low, and the integrated level is high.
Meanwhile, the diaphragm, the filter and the super lens are integrated, the length of the whole module is shortened to be within 5mm, the optical performance of the system is not affected, the phase and the transmittance meet the requirements, and the diaphragm, the filter and the super lens can be combined with other electronic equipment for use, such as a spectrometer, a night vision device and the like.
The specific structure of the compact super-surface near-infrared imaging system is shown in the following embodiments.
Example 1
Referring to fig. 1, the present embodiment provides a compact super-surface near-infrared imaging system, which includes a lens, a structural support 5, and an image sensor 6, where the lens and the image sensor 6 are respectively fixed at two ends of the structural support 5.
The structural support 5 may be a common lens barrel, which is a common structural member that encloses the imaging system. Specifically, the inner side of the lens cone is provided with an annular bulge, so that a limiting effect is achieved. During the process of mounting the lens to the structural support 5, the lens abuts against the annular projection to restrict the mounting position of the lens, ensuring a sufficient distance between the lens and the image sensor 6.
The image sensor 6 is capable of receiving infrared rays, and includes, but is not limited to, a Charge Coupled Device (CCD) image sensor, a Complementary Metal-Oxide Semiconductor (CMOS) and a near infrared camera.
The lens is formed by integrating a diaphragm layer 1, an optical filter layer 2, a substrate 3 and a super surface layer 4, wherein the optical filter layer 2 is plated and evaporated on the back of the super surface layer 4 through a thermal evaporation method, and the diaphragm layer 1 is also plated on the optical filter layer 2 through the thermal evaporation method.
For blocking light, the diaphragm layer 1 is made of a light-impermeable material.
For example, the aperture layer 1 may be composed of an opaque film, which functions to block light, which cannot pass through the film. The opaque film is prepared outside the optical filter layer 2 and is matched with the aperture of the required diaphragm. The central wavelength of the optical filter layer 2 is 700-1100nm, and the half-wave width is 50nm. The material constituting the substrate 3 includes, but is not limited to, siO 2 And GaF 2 . The material constituting the super surface layer 4 includes, but is not limited to, silicon oxide, silicon nitride, aluminum oxide, gallium nitride, titanium oxide, and amorphous silicon.
The super surface layer 4 is composed of a micro-nano structure array, and the micro-nano structure array is composed of a plurality of nano columns or nano holes. The micro-nano structure array can be arranged in a square or hexagonal mode. Nanopores include, but are not limited to, nanocores, and nanocores. The nano-pillars include, but are not limited to, nano-cylinders, nano-triangular pillars, and nano-cross pillars, and the phase of the super-surface layer is changed to 0-2 pi by changing the size and arrangement of the nano-pillars to change the phase of the super-surface layer.
The function of the nanostructure is to allow both phase and transmittance to meet the requirements. As in the four-square arrangement shown in figure 5,
is the distance (period) between each nanopillar. In the hexagonal arrangement shown in FIG. 6, the effective periods in the x and y directions are
,
。
The phase distribution of the super surface layer 4 may be obtained according to the following ways (including but not limited to):
1. according to super surface phase
Calculating formula design, wherein one of the following two formulas is selected:
（1）
；
（2）
；
wherein x and y are super surface atomic coordinates,
the incidence angles of the oblique incidence beams and the x-axis and the y-axis are included, f is the focal length of the designed super lens, lambda is the incident light wavelength,
。
2. by means of optical design software such as Zemax and the like, a Binary phase plane (Binary 2) is adopted to obtain phase distribution and common phase thereof according to an optimization target
Distribution maleFormula (II):
wherein M is the diffraction order, N is the number of terms,
is a coefficient of the term that is,
the normalized coordinate of the corresponding phase.
The imaging half-field angle of the embodiment can reach 85 degrees, and fig. 3 is a light path diagram of actual light.
The implementation principle of the compact super-surface near-infrared imaging system in the embodiment is as follows:
during detection, stray light is blocked by the diaphragm layer 1 by light beams reflected by a detected object, and light beams passing through the diaphragm layer 1 are filtered out of other wave bands through the optical filter layer 2. The light beam is focused through the super-surface 4 to a receiving end-face on said image sensor 6, which will undergo a mode-electrical conversion.
Example 2
The present embodiment differs from embodiment 1 in the structure of the structural support 5, the structure of the lens, and the manner of mounting.
Referring to fig. 2, the present application provides a compact super-surface near-infrared imaging system, which includes a lens, a structural support 5, and an image sensor 6. The lens includes an optical filter layer 2, a substrate 3, and a super surface layer 4. The end of the structural support 5 near the lens has the same structure as the diaphragm layer in embodiment 1, instead of the diaphragm layer 1, to block light. And the structural support 5 in this embodiment is free of the annular protrusion described in embodiment 1.
The assembly process of the imaging system comprises the following steps: the lens is placed in the structural support 5 from right to left until the optical filter layer 2 abuts against the structural support 5, and then the image sensor 6 is placed in the structural support 5.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present disclosure, and shall cover the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. The compact super-surface near-infrared imaging system is characterized by comprising a lens, a structural support piece and an image sensor, wherein the lens and the image sensor are respectively fixed at two ends of the structural support piece; the lens sequentially comprises a diaphragm layer, an optical filtering layer, a substrate and a super surface layer, and the diaphragm layer is light-tight; the image sensor is used for receiving infrared rays.
2. The compact super surface near infrared imaging system of claim 1, characterized in that: the central wavelength of the optical filtering layer is 700-1100nm, and the half-wave width is 50nm.
3. The compact super surface near infrared imaging system of claim 1, characterized in that: the diaphragm layer is a light-tight film and is integrated outside the optical filter layer, and the light-tight film is matched with the aperture of the diaphragm.
4. The compact super surface near infrared imaging system of claim 1, characterized in that: the super surface layer is composed of a micro-nano structure array.
5. The compact hyper-surface near-infrared imaging system of claim 4, wherein: the micro-nano structure array is composed of a plurality of nano columns or nano holes.
6. The compact ultra-surface near-infrared imaging system of claim 5, characterized in that: the nano holes are one of nano round holes, nano triangular holes and nano cross holes;
the nano column is one of a nano cylinder, a nano triangular column and a nano cross column, the phase of the super surface layer is changed by changing the size and the arrangement of the nano column, and the phase change of the super surface layer is 0-2 pi.
7. The compact super-surface near-infrared imaging system according to claim 4, wherein the phase calculation formula of the super-surface layer is as follows:
wherein x and y are super surface atomic coordinates,
is the incident angle of the oblique incident beam and the x-axis and the y-axis, f is the focal length of the designed superlens, and λ is the incident light wavelength
。
8. The compact super-surface near-infrared imaging system according to claim 4, wherein the phase calculation formula of the super-surface layer is as follows:
wherein x and y are super surface atomic coordinates,
is a wave vector, and the wave vector is,
for the field angle, f is the focal length of the designed superlens, and λ is the wavelength of the incident light.
9. The compact super surface near infrared imaging system of claim 4, characterized in that: the micro-nano structure array can be arranged in a square or hexagonal mode.
10. The compact super surface near infrared imaging system of claim 1, characterized in that: the image sensor is one of a CCD, a CMOS and a near infrared camera.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118099243A (en) * | 2024-04-25 | 2024-05-28 | 南京大学 | Packaging structure for deep ultraviolet wide-angle detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118099243A (en) * | 2024-04-25 | 2024-05-28 | 南京大学 | Packaging structure for deep ultraviolet wide-angle detection |
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