Achromatic programmable optical device based on light filtering and manufacturing method and application of achromatic programmable optical device

Abstract

The invention provides an achromatic programmable optical device based on light filtering and a manufacturing method and application thereof. The achromatic programmable optical device can thoroughly solve the problem of chromatic dispersion. The achromatic programmable optical device based on light filtering comprises a light-transmitting substrate; the color filter layer is attached to the light-transmitting substrate and comprises a plurality of combined pixels arranged on the light-transmitting substrate, and each combined pixel is composed of a plurality of single-color sub-pixels which are adjacently arranged; each monochromatic sub-pixel is used for selectively transmitting monochromatic light of a corresponding color and absorbing light of other colors; and the light deflection modulation structure is formed on the color filter layer, comprises a plurality of light deflection modulation units in one-to-one correspondence with the monochromatic sub-pixels, and is used for correspondingly modulating the propagation direction of transmitted light so as to propagate the transmitted light to a specified position while the monochromatic sub-pixels filter the light.

Description

Technical Field

[0001] The present invention relates to the technical field of light deflection modulation, and particularly to an achromatic programmable optical device based on light filtering, a manufacturing method thereof, and an application thereof. Background Art

[0002] Most traditional refractive optical devices achieve a specific phase distribution by constructing a curved surface shape. However, the volume and weight of such devices are usually large. With the development and progress of technology, binary optics based on the diffraction theory (i.e., diffractive optical devices) can achieve the planarization of optical devices to a certain extent, which is not only beneficial to reducing the volume and weight of the devices, but also can offset dispersion to a certain extent by using its dispersion characteristics complementary to those of traditional refractive optical devices, which is beneficial to having huge application scenarios in optical imaging. However, diffractive optical devices and traditional refractive optical devices are limited by factors such as material refractive index and / or Abbe number, and it is difficult to completely offset dispersion, and there are still many limitations such as large chromatic aberration and small field of view.

[0003] In recent years, metasurface optical devices, as a type of planar optical device capable of modulating phase, have the advantages of thin thickness and easy processing. They can simulate traditional refractive optical devices such as prisms or lenses and have the potential to deeply intervene in the imaging industry, and may even trigger an industrial revolution to replace traditional curved lenses. However, since the wavelengths of different colors of light in white light are different, existing metasurface optical devices still cannot well overlap different colors of light, resulting in strong dispersion effects in existing metasurface optical devices, which seriously affects the application of metasurface optical devices in white light imaging. Summary of the Invention

[0004] One advantage of the present invention is to provide an achromatic programmable optical device based on light filtering, a manufacturing method thereof, and an application thereof, which can completely solve the dispersion problem.

[0005] Another advantage of the present invention is to provide an achromatic programmable optical device based on light filtering, a manufacturing method thereof, and an application thereof. In one embodiment of the present invention, the achromatic programmable optical device based on light filtering can completely replace the application of traditional curved lenses in white light imaging.

[0006] Another advantage of the present invention is to provide an achromatic programmable optical device based on light filtering, a manufacturing method thereof, and an application thereof. In one embodiment of the present invention, the achromatic programmable optical device based on light filtering can, while completely solving the dispersion problem, have a relatively low processing difficulty and is convenient for popularization and application in industrial applications.

[0007] Another advantage of the present invention lies in providing a filter-based achromatic programmable optical device, its manufacturing method and applications. Among them, in one embodiment of the present invention, the filter-based achromatic programmable optical device has no specific restrictions on polarization characteristics, and both the practicability and applicability are relatively good.

[0008] Another advantage of the present invention lies in providing a filter-based achromatic programmable optical device, its manufacturing method and applications. Among them, in one embodiment of the present invention, the filter-based achromatic programmable optical device can achieve high-quality and clean imaging, giving full play to the potential of metasurface optics in the white light imaging industry.

[0009] Another advantage of the present invention lies in providing a filter-based achromatic programmable optical device, its manufacturing method and applications. To achieve the above object, expensive materials or complex structures are not required in the present invention. Therefore, the present invention successfully and effectively provides a solution, not only providing a simple filter-based achromatic programmable optical device, its manufacturing method and applications, but also increasing the practicability and reliability of the filter-based achromatic programmable optical device, its manufacturing method and applications.

[0010] To achieve at least one of the above advantages, other advantages and objects of the present invention, the present invention provides a filter-based achromatic programmable optical device, including:

[0011] A light-transmitting substrate;

[0012] A color filter layer attached to the light-transmitting substrate, including a plurality of combined pixels arranged on the light-transmitting substrate. Each of the combined pixels is composed of a plurality of adjacent monochromatic sub-pixels; each of the monochromatic sub-pixels is used to selectively transmit monochromatic light of a corresponding color and absorb light of other colors; and

[0013] A light deflection modulation structure formed on the color filter layer, including a plurality of light deflection modulation units corresponding one-to-one to the monochromatic sub-pixels, for modulating the propagation direction of the transmitted light to propagate to a specified position while the monochromatic sub-pixels filter the light.

[0014] According to an embodiment of the present application, the plurality of monochromatic sub-pixels in each of the combined pixels have different colors, and the light deflection modulation structure is used to converge the monochromatic light transmitted through all the monochromatic sub-pixels in each of the combined pixels to the same specified position.

[0015] According to an embodiment of the present application, multiple monochromatic sub-pixels in each of the combined pixels have different colors, and the light deflection modulation structure is configured to converge monochromatic light of the same color passing through the monochromatic sub-pixels at the same specified position.

[0016] According to an embodiment of the present application, the color filter layer is an RGB color film; each of the combined pixels in the RGB color film includes a red sub-pixel for selectively transmitting red light, a green sub-pixel for selectively transmitting green light, and a blue sub-pixel for selectively transmitting blue light.

[0017] According to an embodiment of the present application, the characteristic width of the monochromatic sub-pixel is required in the geometric optics region.

[0018] According to an embodiment of the present application, the shape of the combined pixel is one of a square, a long strip, and a circular belt.

[0019] According to an embodiment of the present application, the thickness of the color filter layer is greater than the height or depth of the light deflection modulation structure to form a filter substrate between the light deflection modulation structure and the light-transmitting substrate.

[0020] According to an embodiment of the present application, the light deflection modulation structure is one of a metasurface optical structure, a micro-geometric optical structure, and a diffraction optical structure.

[0021] According to an embodiment of the present application, the light deflection modulation structure is a transmission phase type metasurface formed on the color filter layer; each of the light deflection modulation units in the transmission phase type metasurface includes a plurality of dielectric columns arranged periodically and having different widths, and the characteristic size of the dielectric columns is required in the sub-wavelength region.

[0022] According to an embodiment of the present application, the light deflection modulation structure is a geometric phase type metasurface formed on the color filter layer; each of the light deflection modulation units in the geometric phase type metasurface includes a plurality of columns arranged in an array and having a changing pointing angle, and the characteristic width of the columns is required in the sub-wavelength region.

[0023] According to an embodiment of the present application, the light deflection modulation structure is a micro-geometric lens array formed on the color filter layer; each of the light deflection modulation units in the micro-geometric lens array is a Fresnel lens corresponding to the monochromatic sub-pixel one by one.

[0024] According to an embodiment of the present application, the light deflection modulation structure is a diffraction grating array formed on the color filter layer; each of the light deflection modulation units in the diffraction grating array is a relief grating corresponding to the monochromatic sub-pixel one by one.

[0025] According to another aspect of the present application, the present application further provides an optical lens, including the achromatic programmable optical device based on light filtering described in any one of the above.

[0026] According to another aspect of the present application, the present application further provides an imaging module, including:

[0027] a photosensitive component; and

[0028] the above optical lens, where the optical lens is located on the photosensitive side of the photosensitive component.

[0029] According to another aspect of the present application, the present application further provides a manufacturing method of an achromatic programmable optical device based on light filtering, including the steps of:

[0030] Fabricating a color filter layer on a light-transmitting substrate to form a plurality of combined pixels arranged on the light-transmitting substrate, where each combined pixel is composed of a plurality of adjacent monochromatic sub-pixels, and each monochromatic sub-pixel is used to selectively transmit monochromatic light of a corresponding color and absorb light of other colors; and

[0031] Fabricating a light deflection modulation structure on the color filter layer to form a plurality of light deflection modulation units corresponding one-to-one to the monochromatic sub-pixels, for modulating the propagation direction of the transmitted light to a specified position while the monochromatic sub-pixels filter light.

[0032] According to an embodiment of the present application, in the step of fabricating the color filter layer on the surface of the light-transmitting substrate: the RGB color film is attached to the surface of the light-transmitting substrate through a process of attachment, coating, or deposition coating.

[0033] According to an embodiment of the present application, in the step of fabricating the light deflection modulation structure on the color filter layer: a metasurface optical structure, a micro-geometric optical structure, or a diffractive optical structure is fabricated in the color filter layer through a process of photolithography or nanoimprinting. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of an achromatic programmable optical device based on light filtering according to an embodiment of the present application;

[0035] Figure 2 shows a schematic diagram of the first optical path state of the achromatic programmable optical device based on light filtering according to the above embodiment of the present application;

[0036] Figure 3 shows a schematic diagram of the second optical path state of the achromatic programmable optical device based on light filtering according to the above embodiment of the present application;

[0037] Figure 4 Shows a schematic diagram of the third optical path state of the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0038] Figure 5A Shows a schematic diagram of the first form of the combined pixel in the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0039] Figure 5B Shows a schematic diagram of the second form of the combined pixel in the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0040] Figure 5C Shows a schematic diagram of the third form of the combined pixel in the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0041] Figure 5D Shows a schematic diagram of the fourth form of the combined pixel in the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0042] Figure 6 Shows a first example of the light deflection modulation structure in the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0043] Figure 7 Shows a second example of the light deflection modulation structure in the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0044] Figure 8 Shows a third example of the light deflection modulation structure in the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0045] Figure 9 Shows a fourth example of the light deflection modulation structure in the filter-based achromatic programmable optical device according to the above embodiments of the present application;

[0046] Figure 10 Is a block diagram schematic of an imaging module according to an embodiment of the present application;

[0047] Figure 11 Is a flowchart schematic of a manufacturing method of a filter-based achromatic programmable optical device according to an embodiment of the present application.

[0048] Description of main component symbols: 1. Achromatic programmable optical device based on light filtering; 10. Transparent substrate; 20. Color filter layer; 200. RGB color film; 21. Combined pixel; 210. Monochromatic sub-pixel; 211. Red sub-pixel; 212. Green sub-pixel; 213. Blue sub-pixel; 30. Light deflection modulation structure; 300. Light deflection modulation unit; 31. Transmission phase metasurface; 310. Dielectric column; 32. Geometric phase metasurface; 320. Column; 33. Micro geometric lens array; 330. Fresnel lens; 34. Diffraction grating array; 340. Relief grating; 2. Photosensitive component; 3. Optical lens.

[0049] The above description of main component symbols further elaborates on this application in conjunction with the accompanying drawings and specific embodiments. Specific embodiments

[0050] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present invention.

[0051] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present invention.

[0052] In the present invention, the term "a" in the claims and the specification should be understood as "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of this element can be multiple. Unless it is clearly indicated in the disclosure of the present invention that the number of this element is only one, the term "a" cannot be understood as being unique or single, and the term "a" cannot be construed as a limitation on the quantity.

[0053] In the description of the present invention, it should be understood that terms such as "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through a medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0055] Considering that existing refractive optical devices, diffractive optical devices, and metasurface optical devices all have chromatic dispersion problems. Even if the diffractive optical device is combined with the refractive optical device to utilize the complementary chromatic dispersion performance of the two to cancel chromatic dispersion, it is difficult to completely cancel chromatic dispersion due to limitations such as material refractive index and / or Abbe number. Therefore, the present application creatively proposes an achromatic programmable optical device based on filtering, its manufacturing method and application, which can completely solve the chromatic dispersion problem so as to completely replace the application of traditional curved lenses in white light imaging.

[0056] Specifically, referring to the accompanying drawings of this application Figures 1 to 9 According to an embodiment of the present application, an achromatic programmable optical device 1 based on filtering is provided, which may include a light-transmitting substrate 10, a color filter layer 20 attached to the light-transmitting substrate 10, and a light deflection modulation structure 30 formed on the color filter layer 20.

[0057] More specifically, as Figures 1 to 4As shown, the color filter layer 20 may include a plurality of combined pixels 21 arranged on the light-transmitting substrate 10, and each combined pixel 21 is composed of a plurality of adjacent monochromatic sub-pixels 210; each monochromatic sub-pixel 210 is used to selectively transmit monochromatic light of a corresponding color and absorb light of other colors. The light deflection modulation structure 30 includes a plurality of light deflection modulation units 300 corresponding one-to-one to the monochromatic sub-pixels 210, and is used to modulate the propagation direction of the transmitted light correspondingly while the monochromatic sub-pixels 210 filter the light, so that the monochromatic light transmitted through the monochromatic sub-pixels 210 propagates to a specified position, thereby completely eliminating chromatic aberration and thoroughly solving the problem of dispersion.

[0058] It should be noted that since the light deflection modulation structure 30 of the present application is directly formed on the color filter layer 20, and the monochromatic sub-pixels 210 and the light deflection modulation units 300 are in one-to-one correspondence, although the light irradiated on the achromatic programmable optical device 1 based on filtering may be white light or combined light (i.e., light containing multiple colors), each monochromatic sub-pixel 210 only allows monochromatic light of a certain color to pass through, ensuring that each light deflection modulation unit 300 only modulates monochromatic light of the same color and does not need to modulate light of different colors, so as to eliminate chromatic aberration in principle and thoroughly solve the problem of dispersion. It can be understood that the monochromatic mentioned in the present application refers to a narrow band, for example, the monochromatic light can be visible light such as red light, green light or blue light, or light of each narrow band such as infrared light.

[0059] Exemplarily, in the first example of the present application, as Figure 2 shown, the multiple monochromatic sub-pixels 210 in each combined pixel 21 have different colors, and the light deflection modulation structure 30 is used to converge the monochromatic light transmitted through all the monochromatic sub-pixels 210 in each combined pixel 21 to the same specified position, such as the focus. In this way, since the achromatic programmable optical device 1 based on filtering of the present application integrates the light deflection modulation structure 30 and the color filter layer 20 into one body, white light can eliminate chromatic aberration while performing light deflection modulation regardless of which side of the achromatic programmable optical device 1 based on filtering it enters from, realizing high-quality and clean imaging, and fully exerting the potential of the achromatic programmable optical device 1 based on filtering in the white light imaging industry.

[0060] Particularly, as Figure 2 shown, in the achromatic programmable optical device 1 based on filtering of the present application, the light transmitted through all the combined pixels 21 converges to the same specified position at the same time, so that the achromatic programmable optical device 1 based on filtering of the present application can completely replace the application of traditional curved lenses in white light imaging, and still has the advantages of small volume and light weight.

[0061] Optionally, in the second example of the present application, as Figure 3 shown, the light passing through different combined pixels 21 converges at different specified positions (such as different focal points), enabling the achromatic programmable optical device 1 based on light filtering of the present application to outperform traditional microlens arrays to meet the requirements of corresponding imaging applications.

[0062] In addition, in the third example of the present application, as Figure 4 shown, the monochromatic light passing through the monochromatic sub-pixels 210 and having the same color can converge at the same specified position to achieve the desired light programming effect.

[0063] Preferably, as Figures 1 to 4 shown, the thickness of the color filter layer 20 is greater than the height / depth of the light deflection modulation structure 30 to form a filter substrate between the light deflection modulation structure 30 and the light-transmitting substrate 10, ensuring that the color filter layer 20 effectively filters light, allowing only light of a specific color to pass through and preventing light of other colors from passing through.

[0064] Exemplarily, the light-transmitting substrate 10 of the present application can be, but is not limited to, implemented as a glass substrate, a plastic substrate, a polymer material substrate, etc., as long as it can allow light to pass through. The present application will not elaborate further on this.

[0065] In addition, as Figures 1 to 4 shown, the color filter layer 20 of the present application can be, but is not limited to, implemented as an RGB color film 200; that is, each combined pixel 21 in the RGB color film 200 can include a red sub-pixel 211 for selectively transmitting red light, a green sub-pixel 212 for selectively transmitting green light, and a blue sub-pixel 213 for selectively transmitting blue light. It can be understood that for the present application: the red light band can be between 600 nanometers and 630 nanometers; the green light band can be between 500 nanometers and 600 nanometers; the blue light band can be between 430 nanometers and 470 nanometers.

[0066] It should be noted that in other examples of the present application, the color filter layer 20 can also be implemented as a color film composed of other color combinations, such as a three-primary color film based on red, yellow, and blue, etc.

[0067] Optionally, the RGB color film 200 of the present application is attached to the surface of the light-transmitting substrate 10 through processes such as attachment, coating, or deposition coating. It can be understood that the RGB color film 200 of the present application is generally a mixture of pigments and resins, which can selectively absorb two colors in RGB and transmit one color. Its manufacturing process is very mature and is widely used in LCD display screens in the liquid crystal display industry or CMOS image sensors in the imaging industry. The present application will not elaborate on this. In addition, the transmittance and light-transmitting bandwidth of the monochromatic sub-pixels 210 in the RGB color film 200 of the present application can be adjusted, such as by adjusting the concentration of the pigment or the thickness of the film layer.

[0068] Optionally, in order to avoid diffraction interference between different monochromatic sub-pixels 210, the characteristic width of the monochromatic sub-pixels 210 of the present application is required to be in the geometric optics region; for example, the width of each monochromatic sub-pixel 210 is greater than one hundred times the wavelength of the corresponding monochromatic light, that is, the width of each monochromatic sub-pixel 210 is more than one hundred times the wavelength of the corresponding monochromatic light. It can be understood that the geometric optics region mentioned in the present application refers to a size more than one hundred times the wavelength.

[0069] It should be noted that the morphology of the combined pixel 21 can be but is not limited to being implemented as a square as shown in Figure 5A , a long strip as shown in Figure 5B and Figure 5C or a circular belt shape as shown in Figure 5D . It can be understood that the combined pixel 21 of the present application can also be implemented in other morphologies, as long as it can ensure that each combined pixel 21 includes monochromatic sub-pixels 210 of different colors. The present application will not elaborate on this.

[0070] According to the above embodiments of the present application, the light deflection modulation structure 30 of the present application can be but is not limited to being implemented as an optical structure with a light deflection modulation function such as a metasurface optical structure, a micro-geometric optical structure, or a diffractive optical structure. Each light deflection modulation unit 300 can be individually designed according to the corresponding light deflection modulation requirements, so that all monochromatic light passing through each combined pixel 21 can converge at the same point.

[0071] It should be noted that each light deflection modulation unit 300 in the metasurface optical structure of the present application can transmit the corresponding transmitted light to a specified position (such as the focal point), thereby eliminating the chromatic aberration existing in the metasurface itself.

[0072] Exemplarily, in the first example of the present application, as shown in Figure 6 , the light deflection modulation structure 30 is implemented as a transmissive phase-type metasurface 31 formed on the color filter layer 20, which is convenient for realizing metasurface optical imaging.

[0073] Optionally, as shown in Figure 6 , each light deflection modulation unit 300 in the transmissive phase metasurface 31 includes a plurality of dielectric columns 310 arranged periodically with different widths. The characteristic dimensions of the dielectric columns 310 are required to be in the sub-wavelength region. For example, the width of the dielectric column 310 is less than half of the wavelength of the corresponding monochromatic light, and the depth of the dielectric column 310 is greater than the wavelength of the corresponding monochromatic light. It can be understood that the transmissive phase metasurface 31 of the present application has no requirement for the polarization state of light during light deflection modulation, and has a wide application range.

[0074] In the second example of the present application, as shown in Figure 7 , the light deflection modulation structure 30 is implemented as a geometric phase metasurface 32 formed on the color filter layer 20, which is convenient for realizing metasurface optical imaging.

[0075] Optionally, as shown in Figure 7 , each light deflection modulation unit 300 in the geometric phase metasurface 32 includes a plurality of columns 320 arranged in an array with a changing pointing angle. The characteristic width of the columns 320 is required to be in the sub-wavelength region. For example, the column 320 is a cuboid metal column, the column 320 has a sub-wavelength rectangular cross-section, and the height of the column 320 can be much greater than the wavelength of the corresponding monochromatic light. It can be understood that the equivalent refractive index (i.e., the average refractive index of the material and air) seen by light along the long side direction of the column 320 is greater than the equivalent refractive index seen along the short side direction of the column 320, so that the geometric phase metasurface 32 can be equivalent to a column of liquid crystals. In addition, although the geometric phase metasurface 32 of the present application is sensitive to the polarization state of light during light deflection modulation, when the half-wave condition: is satisfied, it can modulate the wavefront of the optically active polarization to meet the requirements of specific application scenarios.

[0076] In the third example of the present application, as shown in Figure 8 , the light deflection modulation structure 30 is implemented as a micro-geometric lens array 33 formed on the color filter layer 20 to modulate the phase by refraction, which is convenient for realizing geometric optical imaging.

[0077] Optionally, as shown in Figure 8 , each light deflection modulation unit 300 in the micro-geometric lens array 33 can but is not limited to be implemented as a Fresnel lens 330 corresponding to the monochromatic sub-pixel 210 one by one. In this way, the geometric size of each Fresnel lens 330 will be comparable to the size of the monochromatic sub-pixel 210, that is, much larger than the wavelength; for example, the geometric size of each Fresnel lens 330 is one hundred times the wavelength of the corresponding monochromatic light. It can be understood that each Fresnel lens 330 can refract the transmitted light to a specified position (such as the focus), thereby eliminating the chromatic aberration existing in refractive optics.

[0078] In the fourth example of the present application, as Figure 9 shown, the light deflection modulation structure 30 is implemented as a diffraction grating array 34 formed on the color filter layer 20 to modulate the phase by diffraction, facilitating the realization of diffraction grating imaging.

[0079] Optionally, as Figure 9 shown, each light deflection modulation unit 300 in the diffraction grating array 34 can but is not limited to be implemented as a relief grating 340 corresponding one-to-one to the monochromatic sub-pixel 210. It can be understood that each relief grating 340 can operate at a certain diffraction order, and the relief grating 340 corresponding to the monochromatic sub-pixel 210 can diffract the corresponding transmitted light to a specified position (such as the focus), thereby eliminating the chromatic aberration existing in the diffractive optics. In addition, since the geometric size of the monochromatic sub-pixel 210 in the present application is much larger than the wavelength, such as one hundred times the wavelength, the relief grating 340 corresponding to each monochromatic sub-pixel 210 operates in the refractive optics region as a whole.

[0080] According to another aspect of the present application, as Figure 10 shown, an embodiment of the present application further provides an imaging module, which may include a photosensitive component 2 and an optical lens 3 having the above-mentioned achromatic programmable optical device 1 based on filtering. The optical lens 3 is located on the photosensitive side of the photosensitive component 2 to use the achromatic programmable optical device 1 based on filtering to replace the traditional lens and achieve high-quality and clean white light imaging.

[0081] It should be noted that the optical lens 3 mentioned in the present application may only include the achromatic programmable optical device 1 based on filtering, or may be composed of the achromatic programmable optical device 1 based on filtering and a traditional lens. In addition, the optical lens 3 mentioned in the present application can be applied not only in the imaging module for imaging modulation, but also in other scenarios such as the eyepiece or objective lens in a microscope, which will not be elaborated in the present application.

[0082] According to another aspect of the present application, as Figure 11 shown, an embodiment of the present application further provides a manufacturing method of an achromatic programmable optical device based on filtering, which may include the steps of:

[0083] S100: fabricate a color filter layer on a light-transmitting substrate to form a plurality of combined pixels arranged on the light-transmitting substrate, where each combined pixel is composed of a plurality of adjacent monochromatic sub-pixels, and each monochromatic sub-pixel is used to selectively transmit monochromatic light of a corresponding color and absorb light of other colors; and

[0084] S200: Fabricate a light deflection modulation structure on the color filter layer to form a plurality of light deflection modulation units corresponding one-to-one to the monochromatic sub-pixels, which are used to modulate the propagation direction of the transmitted light correspondingly to propagate to a specified position while filtering the light in the monochromatic sub-pixels.

[0085] It should be noted that in step S100 of the present application: the RGB color film is attached to the surface of the light-transmitting substrate by means of an attaching, coating or depositing coating process.

[0086] Optionally, in step S200 of the present application: a metasurface optical structure, a micro-geometric optical structure or a diffractive optical structure is fabricated in the color filter layer by means of a photolithography or nanoimprinting process.

[0087] Exemplarily, when fabricating a metasurface optical structure by means of a nanoimprinting process: first coat a photoresist on the surface of the color filter layer; then imprint with a mold and demold after curing by light / heat, etc.; next, etch the color filter layer after removing the residual photoresist; finally, remove all the photoresist to fabricate a metasurface optical structure in the color filter layer.

[0088] When fabricating a metasurface optical structure by means of a photolithography process: first coat a photoresist on the surface of the color filter layer; then expose and develop to form a photoresist mask; next, etch the color filter layer; finally, remove all the photoresist to fabricate a metasurface optical structure in the color filter layer.

[0089] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0090] The above embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An achromatic programmable optical device based on light filtering, characterized in that, Comprising: A light-transmitting substrate; A color filter layer attached to the light-transmitting substrate, including a plurality of combined pixels arranged on the light-transmitting substrate, each of the combined pixels being composed of a plurality of adjacent monochromatic sub-pixels; each of the monochromatic sub-pixels is used to selectively transmit monochromatic light of a corresponding color and absorb light of other colors; And A light deflection modulation structure formed on the color filter layer, including a plurality of light deflection modulation units corresponding one-to-one with the monochromatic sub-pixels, for modulating the propagation direction of the transmitted light to propagate to a specified position while the monochromatic sub-pixels filter light.

2. The achromatic programmable optical device based on light filtering according to claim 1, wherein The plurality of monochromatic sub-pixels in each of the combined pixels have different colors, and the light deflection modulation structure is used to converge the monochromatic light transmitted through all of the monochromatic sub-pixels in each of the combined pixels to the same specified position.

3. The achromatic programmable optical device based on light filtering according to claim 1, wherein The plurality of monochromatic sub-pixels in each of the combined pixels have different colors, and the light deflection modulation structure is used to converge the monochromatic light of the same color transmitted through the monochromatic sub-pixels to the same specified position.

4. The achromatic programmable optical device based on light filtering according to claim 1, wherein The color filter layer is an RGB color film; each of the combined pixels in the RGB color film includes a red sub-pixel for selectively transmitting red light, a green sub-pixel for selectively transmitting green light, and a blue sub-pixel for selectively transmitting blue light.

5. The achromatic programmable optical device based on light filtering according to claim 1, wherein The characteristic width of the monochromatic sub-pixels is required to be in the geometric optics region.

6. The achromatic programmable optical device based on filtering according to claim 1, wherein The shape of the combined pixels is one of square, long strip, and circular strip.

7. The achromatic programmable optical device based on light filtering according to claim 1, wherein The thickness of the color filter layer is greater than the height or depth of the light deflection modulation structure to form a filter substrate between the light deflection modulation structure and the light-transmitting substrate.

8. The achromatic programmable optical device based on filtering according to any one of claims 1 to 7, characterized in that, The light deflection modulation structure is one of a metasurface optical structure, a micro-geometric optical structure, and a diffractive optical structure.

9. The achromatic programmable optical device based on filtering according to any one of claims 1 to 7, characterized in that The light deflection modulation structure is a transmission phase type metasurface formed on the color filter layer; each of the light deflection modulation units in the transmission phase type metasurface includes a plurality of dielectric columns arranged periodically and with different widths, and the characteristic size of the dielectric columns is required to be in the sub-wavelength region.

10. The achromatic programmable optical device based on light filtering according to any one of claims 1 to 7, characterized in that, The light deflection modulation structure is a geometric phase type metasurface formed on the color filter layer; each of the light deflection modulation units in the geometric phase type metasurface includes a plurality of columns arranged in an array and with changing pointing angles, and the characteristic width of the columns is required to be in the sub-wavelength region.

11. The achromatic programmable optical device based on light filtering according to any one of claims 1 to 7, characterized in that, The light deflection modulation structure is a micro-geometric lens array formed on the color filter layer; each of the light deflection modulation units in the micro-geometric lens array is a Fresnel lens corresponding one-to-one with the monochromatic sub-pixels.

12. The achromatic programmable optical device based on filtering according to any one of claims 1 to 7, characterized in that, The light deflection modulation structure is a diffraction grating array formed on the color filter layer; each of the light deflection modulation units in the diffraction grating array is a relief grating corresponding one-to-one with the monochromatic sub-pixels.

13. Optical lens, characterized in that, Including the achromatic programmable optical device based on light filtering according to any one of claims 1 to 12.

14. Imaging module, characterized in that, Comprising: A photosensitive component; And The optical lens according to claim 13, the optical lens being located on the photosensitive side of the photosensitive component.

15. A manufacturing method of an achromatic programmable optical device based on light filtering, characterized in that, Including steps: Fabricate a color filter layer on a light-transmitting substrate to form a plurality of combined pixels arranged on the light-transmitting substrate, wherein each combined pixel is composed of a plurality of adjacent monochromatic sub-pixels, and each monochromatic sub-pixel is used to selectively transmit monochromatic light of a corresponding color and absorb light of other colors; and Fabricate a light deflection modulation structure on the color filter layer to form a plurality of light deflection modulation units corresponding one-to-one to the monochromatic sub-pixels, which are used to correspondingly modulate the propagation direction of the transmitted light to propagate to a specified position while the monochromatic sub-pixels filter the light.

16. The manufacturing method of the achromatic programmable optical device based on filtering according to claim 15, wherein, In the step of fabricating the color filter layer on the surface of the light-transmitting substrate: attach an RGB color film to the surface of the light-transmitting substrate by means of adhesion, coating or deposition coating process.

17. The manufacturing method of the achromatic programmable optical device based on light filtering according to claim 15 or 16, characterized in that, In the step of fabricating the light deflection modulation structure on the color filter layer: fabricate one of a metasurface optical structure, a micro-geometric optical structure and a diffractive optical structure in the color filter layer by means of photolithography or nanoimprinting process.

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