A method for preparing and applying a microstructured polarizer

Abstract

This invention proposes a method for preparing and applying a microstructured polarizer. The method involves first preparing an alignment solution, then spin-coating it onto a cleaned substrate to form an orientation layer. Next, the alignment layer is irradiated with linearly polarized ultraviolet light to obtain a patterned, structured polarization-oriented alignment layer. A liquid crystal polymer solution is then prepared and spin-coated onto the patterned, structured polarization-oriented alignment layer to obtain a liquid crystal polymer monomer film. Subsequently, the liquid crystal polymer monomer film is treated with a photocuring process to obtain a liquid crystal polymer thin film. A polarizing absorber dye is then deposited on the liquid crystal polymer thin film to form a polarizing absorber dye film, resulting in a microstructured polarizer. This invention avoids the stability and solubility challenges associated with dye-liquid crystal molecule mixing, significantly improving the stability of the optical thin film and the robustness of the system.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging and micro-nano optics, and specifically relates to a method for preparing and applying a microstructured polarizer. Background Technology

[0002] In the fields of optics and related technologies, polarization, as a fundamental property of light, plays a crucial role. Polarization imaging technology can reveal information that conventional intensity cameras cannot detect, such as the vector distribution of structured beams, the texture and stress of reflective or transmissive surfaces, and the optical activity of biological materials. This technology has been widely applied in various fields, including target recognition, seabed observation, biomedicine, ecological monitoring, and stereoscopic vision enhancement, greatly advancing our understanding of the environment and scientific research. It has also achieved breakthroughs in practical applications in industry, medicine, and environmental protection.

[0003] However, most existing polarization imaging technologies are limited to a single spectral band or the infrared band, relying on narrow-band imaging methods. This restricts the simultaneous acquisition of multi-target information, often resulting in insufficient image contrast and clarity. Furthermore, these imaging systems are fragile under extreme environmental conditions and their applicability is limited to specific situations. By integrating spectral, polarization, and spatial multidimensional data of the target object, the development of polarization imaging technology holds the promise of significantly enhancing target detection and identification efficiency and adapting to a wider range of application environments. Therefore, developing a polarization imaging system that can cover a wider band, possesses superior performance, high integration, and is cost-effective is particularly important.

[0004] Currently, focal plane polarization imaging devices on the market, with their microarray polarizers as the core component, stand out due to their compact structure and have been successfully commercialized. Devices such as the PolarCam CCD polarization camera from 4D Tech and the IMX250MZR CMOS polarization sensor from Sony represent the latest advancements in this technology. These devices utilize subwavelength metal wire grid microarrays, constructed using specific fabrication techniques such as electron beam lithography, nanoimprint lithography, and laser interferometry. While offering many advantages, they also suffer from drawbacks such as a narrow operating wavelength range, high cost, and susceptibility to parameter variations during manufacturing.

[0005] To address these challenges, the development of new materials and technologies is crucial, such as dyes with tunable spectral absorption characteristics and optics based on micro / nano optical alignment techniques. These advancements not only improve the flexibility and accuracy of polarization imaging but also contribute to the advancement of high-performance displays. In conclusion, continuous optimization and innovation in polarization imaging technology are of great significance for meeting increasingly diverse application needs and improving adaptability to operating environments. Summary of the Invention

[0006] In view of the above, the main objective of this invention is to provide a method for preparing and applying a microstructured polarizer, in order to solve the aforementioned technical problems.

[0007] This invention proposes a method for preparing a microstructured polarizer, which includes the following steps:

[0008] Step 1: Use an aqueous solution of optical cleaning agent to ultrasonically clean the substrate with one side coated with an antireflection film for a first preset time. Then use acetone and alcohol to wash off the aqueous solution of optical cleaning agent on the substrate. Place the cleaned substrate in an oven at a first preset temperature for drying.

[0009] Step 2: Dissolve the polarizing light-absorbing dye in dimethylformamide at a preset weight ratio to prepare an orientation solution. Spin-coat the orientation solution onto the cleaned substrate. Then place the substrate on a test bench at a second preset temperature and heat for a second preset time to form an orientation layer.

[0010] Step 3: Irradiate the alignment layer with linearly polarized ultraviolet light to obtain an alignment layer with a programmable structured polarization orientation.

[0011] Step 4: Mix liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 and dissolve them in toluene solution to prepare liquid crystal polymer solution. Spin-coat the liquid crystal polymer onto an alignment layer with a programmable structured polarization orientation to obtain a liquid crystal polymer monomer coating.

[0012] Step 5: Use a photocuring process to process the liquid crystal polymer monomer coating to obtain a liquid crystal polymer film;

[0013] Step 6: Deposit polarizing light-absorbing dyes on the liquid crystal polymer film to form a polarizing light-absorbing dye coating, thus obtaining a microstructured polarizer.

[0014] Furthermore, in step 1, the antireflective coating operates in the wavelength range of 400-700nm, and the first preset time is 15-20min.

[0015] Furthermore, in step 1, the first preset temperature is 50-200℃.

[0016] Furthermore, in step 2, the weight ratio of the polarizing light-absorbing dye to dimethylformamide is 0.5 wt%.

[0017] Furthermore, in step 2, the second preset temperature is 50-200℃, and the second preset time is 1-60min.

[0018] Furthermore, in step 4, the mass ratio of the liquid crystal monomer RM57 and the ultraviolet photoinitiator IG184 is 96:4.

[0019] Furthermore, in step 4, the mixture of liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 is 15 wt% of toluene solvent.

[0020] Furthermore, in step 6, the polarizing absorber dye is produced using a mixture of one or more of AD1, Sudan III, and Sudan b1ack solvents.

[0021] An application of a microstructured polarizer: A microstructured polarizer based on optically controlled orientation technology is prepared using the above-described method. The microstructured polarizer based on optically controlled orientation technology is used to capture the polarization information of light.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention proposes a light-controlled orientation technique based on interlayer molecular self-organization for the fabrication of azo dye-based broad-spectrum all-Stokes microarray polarizers. This novel method not only overcomes the main shortcomings of traditional polarization cameras but also holds promise for effectively replacing high-cost imported polarization cameras through more economical technical means.

[0024] 2. The self-organizing technology based on layered coating employed in this invention can orient a wider range of dye molecules, breaking the limitation of using only a few azo dye molecules and significantly expanding the range of material choices, thereby increasing the possibility of preparing high-performance, broad-spectrum, all-Stokes microstructure polarizers. Furthermore, this technology avoids the stability and solubility challenges when dyes are mixed with liquid crystal molecules, significantly improving the stability of the optical thin film and the robustness of the system.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by means of embodiments of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the fabrication steps for a microstructured polarizer;

[0027] Figure 2 These are molecular structure diagrams of three polarizing light-absorbing dyes;

[0028] Figure 3 This is a graph showing the extinction ratio of a polarizer using AD11 dye as a function of wavelength.

[0029] Figure 4 This is a schematic diagram of the optical path device for extinction ratio testing;

[0030] Figure 5 This is a schematic diagram of the extinction ratio of AD1 polarizers prepared with different numbers of layers;

[0031] Figure 6 This is a schematic diagram of the exposure optical path of a laser direct writing system;

[0032] Figure 7 These are micrographs of an 8μm × 8μm dye microarray with transmission axes of 0° and 90°, prepared by laser direct writing.

[0033] Figure 8 This is a schematic diagram of the average transmittance at 450nm and its fitting curve of a unidirectional sample prepared by laser direct writing exposure technology.

[0034] Figure 9 The images show patterned AD1 images on a flexible liquid crystal polymer film and the curves showing the normalized extinction ratio of a flexible polarizer as a function of the number of bending cycles with a radius of 1 mm.

[0035] Figure 10 This is a graph showing the extinction ratio of a polarizer made with Sudan III as the polarizing absorber as a function of wavelength.

[0036] Figure 11 This is a graph showing the extinction ratio of a polarizer made with Sudan Black as the polarizing absorber as a function of wavelength.

[0037] Figure 12 The curve shows the extinction ratio of a polarizer made with a mixture of AD1, Sudan III, and Sudan Black as polarizing absorbers, as a function of wavelength. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] These and other aspects of the embodiments of the present invention will become clear from the following description and accompanying drawings. In these descriptions and drawings, some specific embodiments of the present invention are specifically disclosed to illustrate some ways of implementing the principles of the embodiments of the present invention; however, it should be understood that the scope of the embodiments of the present invention is not limited thereto.

[0040] Example 1

[0041] This invention provides a method for fabricating a microstructured polarizer. The method is used to fabricate the aforementioned microstructured polarizer based on optically controlled alignment technology. The method includes the following steps:

[0042] Step 1: Ultrasonically clean the substrate with an antireflection coating on one side of the substrate with an effective wavelength of 400nm for 15 minutes using a 5% optical cleaning agent aqueous solution. Then, wash the substrate with acetone and alcohol to remove the optical cleaning agent aqueous solution. Place the cleaned substrate in an oven at 130℃ for drying.

[0043] Step 2: Dissolve AD1 in dimethylformamide at 0.5 wt% to prepare an orientation solution. Spin-coat the orientation solution onto the cleaned substrate. Then place the substrate on a test bench at 100°C and heat for 5 min to form an orientation layer.

[0044] Step 3: Irradiate the alignment layer with linearly polarized ultraviolet light to obtain an alignment layer with a programmable structured polarization orientation.

[0045] Step 4: Mix liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 at a mass ratio of 96:4 and dissolve them in a 15wt% toluene solution to prepare a liquid crystal polymer solution. Spin-coat the liquid crystal polymer onto a patterned, programmable, structured polarization-oriented alignment layer to obtain a liquid crystal polymer monomer coating.

[0046] Step 5: Use a photocuring process to process the liquid crystal polymer monomer coating to obtain a liquid crystal polymer film;

[0047] Step 6: AD1 is deposited on a liquid crystal polymer film as a polarizing light-absorbing dye to form a polarizing light-absorbing dye coating and obtain a microstructured polarizer.

[0048] Example 2

[0049] This invention provides a method for fabricating a microstructured polarizer. The method is used to fabricate the aforementioned microstructured polarizer based on optically controlled alignment technology. The method includes the following steps:

[0050] Step 1: Ultrasonically clean the substrate with an antireflection coating on one side of the substrate with an effective wavelength of 400nm for 15 minutes using a 5% optical cleaning agent aqueous solution. Then, wash the substrate with acetone and alcohol to remove the optical cleaning agent aqueous solution. Place the cleaned substrate in an oven at 130℃ for drying.

[0051] Step 2: Dissolve Sudan III in dimethylformamide at 0.5 wt% to prepare an orientation solution. Spin-coat the orientation solution onto the cleaned substrate. Then place the substrate on a test bench at 100°C and heat for 5 min to form an orientation layer.

[0052] Step 3: Irradiate the alignment layer with linearly polarized ultraviolet light to obtain an alignment layer with a programmable structured polarization orientation.

[0053] Step 4: Mix liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 at a mass ratio of 96:4 and dissolve them in a 15wt% toluene solution to prepare a liquid crystal polymer solution. Spin-coat the liquid crystal polymer onto a patterned, programmable, structured polarization-oriented alignment layer to obtain a liquid crystal polymer monomer coating.

[0054] Step 5: Use a photocuring process to process the liquid crystal polymer monomer coating to obtain a liquid crystal polymer film;

[0055] Step 6: Deposit Sudan III as a polarizing light-absorbing dye on a liquid crystal polymer film to form a polarizing light-absorbing dye coating and obtain a microstructured polarizer.

[0056] Example 3

[0057] This invention provides a method for fabricating a microstructured polarizer. The method is used to fabricate the aforementioned microstructured polarizer based on optically controlled alignment technology. The method includes the following steps:

[0058] Step 1: Ultrasonically clean the substrate with an antireflection coating on one side of the substrate with an effective wavelength of 400nm for 15 minutes using a 5% optical cleaning agent aqueous solution. Then, wash the substrate with acetone and alcohol to remove the optical cleaning agent aqueous solution. Place the cleaned substrate in an oven at 130℃ for drying.

[0059] Step 2: Dissolve Sudan Black in dimethylformamide at 0.5 wt% to prepare an orientation solution. Spin-coat the orientation solution onto the cleaned substrate. Then place the substrate on a test bench at 100°C and heat for 5 minutes to form an orientation layer.

[0060] Step 3: Irradiate the alignment layer with linearly polarized ultraviolet light to obtain an alignment layer with a programmable structured polarization orientation.

[0061] Step 4: Mix liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 at a mass ratio of 96:4 and dissolve them in a 15wt% toluene solution to prepare a liquid crystal polymer solution. Spin-coat the liquid crystal polymer onto a patterned, programmable, structured polarization-oriented alignment layer to obtain a liquid crystal polymer monomer coating.

[0062] Step 5: Use a photocuring process to process the liquid crystal polymer monomer coating to obtain a liquid crystal polymer film;

[0063] Step 6: Deposit Sudan Black as a polarizing light-absorbing dye on a liquid crystal polymer film to form a polarizing light-absorbing dye coating, thus obtaining a microstructured polarizer.

[0064] Example 4

[0065] This invention provides a method for fabricating a microstructured polarizer. The method is used to fabricate the aforementioned microstructured polarizer based on optically controlled alignment technology. The method includes the following steps:

[0066] Step 1: Ultrasonically clean the substrate with an antireflection coating on one side of the substrate with an effective wavelength of 400nm for 15 minutes using a 5% optical cleaning agent aqueous solution. Then, wash the substrate with acetone and alcohol to remove the optical cleaning agent aqueous solution. Place the cleaned substrate in an oven at 130℃ for drying.

[0067] Step 2: Dissolve AD1, Sudan III and Sudan Black in dimethylformamide at 0.5 wt% to prepare an orientation solution. Spin-coat the orientation solution onto the cleaned substrate, and then place the substrate on a test bench at 100°C and heat for 5 min to form an orientation layer.

[0068] Step 3: Irradiate the alignment layer with linearly polarized ultraviolet light to obtain an alignment layer with a programmable structured polarization orientation.

[0069] Step 4: Mix liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 at a mass ratio of 96:4 and dissolve them in a 15wt% toluene solution to prepare a liquid crystal polymer solution. Spin-coat the liquid crystal polymer onto a patterned, programmable, structured polarization-oriented alignment layer to obtain a liquid crystal polymer monomer coating.

[0070] Step 5: Use a photocuring process to process the liquid crystal polymer monomer coating to obtain a liquid crystal polymer film;

[0071] Step 6: A mixed solvent of AD1, Sudan III, and Sudan Black is used as a polarizing light-absorbing dye to deposit on a liquid crystal polymer film to form a polarizing light-absorbing dye coating, thereby obtaining a microstructured polarizer.

[0072] Example 5

[0073] A microstructured polarizer is prepared using the method described in any one of Examples 1 to 4.

[0074] Example 6

[0075] The microstructured polarizer fabricated using the method in Example 1 is a composite material consisting of a liquid crystal polymer as the "host" material and AD1 as the "guest" material. Utilizing the host-guest effect, the orientation of AD1 is related to the orientation of the liquid crystal polymer. By exposing the alignment layer with polarized light using a specific structured beam, a specific long axis orientation of the liquid crystal molecules is achieved, thereby realizing a large-area orientation of AD1.

[0076] Practical applications require coatingable polarizing devices to possess excellent polarization performance. Extinction ratio is a crucial characteristic parameter of linear polarizers. Extinction ratio measurement typically employs a rotating analyzer method. The incident light from the source passes through the depolarizer under test (actually a polarizer), then through a rotating analyzer, and finally is measured by a photodetector. When the transmission axis of the analyzer is aligned with the transmission axis of the depolarizer under test, the photodetector collects the maximum optical power; when the transmission axis of the analyzer is orthogonal to the transmission axis of the depolarizer under test, the photodetector collects the minimum optical power. The extinction ratio ER is the ratio of the maximum power to the minimum power.

[0077] pass Figure 3 It can be seen that when the orientation of AD1 molecules is parallel to the analyzer's transmission axis, a large-area uniform dark state is observed, and no blocky, rough film is formed. When the orientation of the analyzer's transmission axis is rotated to be perpendicular to the previous state, the dye molecules exhibit a bright state. The results show that under the new process of this invention, the photocured liquid crystal polymer does not exhibit obvious macroscopic perturbation of the molecular orientation of AD1 molecules.

[0078] pass Figure 4 As can be seen, the following requirements need to be considered when constructing the extinction ratio testing system of this invention: the laser light source is a wavelength of 450nm; the depolarizer is an LBTEK (APD 10-A) achromatic quartz depolarizer with an aperture > 90% CA; the sample to be tested is used as the polarizer; the analyzer is an LBTEK thin-film linear polarizer, model: FLP25-VIS-M, with an extinction ratio > 5000:1 (450nm-700nm); the photodetector is a Thorlabs PM100D digital optical power meter and an S120C photodiode probe, with an optical power measurement wavelength range of 400-1000nm and an energy range of 50nW-50mW.

[0079] Combination Figure 5 It is known that the extinction ratio of the AD1 polarizer is related to the thickness of the liquid crystal polymer film layer. By repeating steps 4 to 5 in Example 1, microstructure polarizers with different numbers of liquid crystal polymer film layers can be prepared. During the stacking of liquid crystal polymer film layers, the extinction ratio of the AD1 polarizer increases with the increase of the number of liquid crystal polymer film layers. When the number of liquid crystal polymer film layers is 5, the thickness of the AD1 polarizer is 3.5 μm and the extinction ratio is 336. The PE value is calculated to be 99.7% by the polarization efficiency expression of the polarizer, indicating that the polarizer can be used as a linear polarizer.

[0080] Example 7

[0081] A dye microarray polarizer sample with a subpixel size of 8μm × 8μm was fabricated using laser direct writing technology. The polarizer was rotated to collect the pattern of the device under a microscope. The molecular alignment of the microarray in four states of a superpixel unit was observed. When the incident polarized light changed from 0 degrees to 90 degrees, the states corresponding to the mutually perpendicular micro-polarized subpixels interchanged. When the analyzer's transmission axis was 0°, the maximum transmittance was observed when the azo dye molecules were aligned with the analyzer's transmission axis; the minimum transmittance was observed when the azo dye molecules were aligned perpendicular to the analyzer's transmission axis; and the grayscale value of the unit was centered when the angle between the two was 45° or 315°. Rotating the analyzer by 90° interchanged the squares representing the maximum and minimum transmittance, while the grayscale values ​​remained unchanged at 45° and 315°.

[0082] Combination Figure 6 As can be seen, ultraviolet light emitted from the light source is irradiated onto the photosensitive material located on a triaxial displacement stage via a polarization modulator. The response of the alignment material is controlled by changing the linear polarization angle of the exposure beam. Possible polarization control devices include half-wave plates or quarter-wave plates. The light then passes through spatial filtering devices and collimating lenses. Finally, the objective lens focuses the beam onto the substrate. The substrate with the spin-coated alignment material can be placed on the displacement stage. The computer controls the movement direction of the displacement stage, allowing precise alignment to any position on the substrate surface; that is, the desired projected image is computer-controlled. The laser direct-write system used in this example can achieve an exposure resolution of 1.5 μm, a fast-axis resolution of liquid crystal molecules of + / -0.3°, a point-to-point alignment speed of 200 Hz, a line-to-line alignment speed of 100 mm / s, a ring-to-ring alignment speed of 240 rpm, and a maximum alignment element diameter exceeding 12 inches.

[0083] Combination Figure 4 and Figure 7 As can be seen, in order to accurately measure the transmittance and extinction ratio to evaluate the optical performance of the dye-based microarray device, a transmittance testing device is used. The sample to be tested is used as the polarizer, and a polarizing device with a high extinction ratio is used as the analyzer. The analyzer is precisely rotated 360°, and optical power data is recorded at 15° intervals. The PE value of the unidirectional polarizer sample prepared using laser direct writing technology in this example is calculated to be 99.7% at 450nm, and its extinction ratio is 336.

[0084] Example 8

[0085] Combination Figure 9As shown in Figures a and b, based on the preparation steps of Example 1, PDMS prepared by mixing Sylgard 184 silicone elastomer and curing agent at a ratio of 10:1 and then placing it in a vacuum for 30 min was spin-coated onto the AD1 coating at a speed of 1000 r / min for 30 s. The PDMS silicone rubber was then cured at 120°C for 1 h, and finally the sample was placed in deionized water for 3 min to obtain a flexible liquid crystal polymer film.

[0086] Combination Figure 9 As shown in Figure c, cyclic deformation tests were performed on the sample to determine the mechanical durability of the ultrathin flexible polarizer. At 21°C and 43% humidity, with a bending radius of 1 mm, the sample was bent 100 times consecutively, and the extinction ratio of the flexible linear polarizer was measured at 450 nm. When the number of folds increased to 300, the extinction ratio decreased slightly, then remained stable.

[0087] Combination Figure 10 It can be seen that the microstructure polarizer prepared by Example 2 has the states in bright and dark states, as well as its extinction ratio in different wavelength bands.

[0088] Combination Figure 11 It can be seen that the microstructure polarizer prepared by Example 3 has the states in bright and dark states, as well as its extinction ratio in different wavelength bands.

[0089] Combination Figure 12 It can be seen that the microstructure polarizer prepared by Example 4 has the states in bright and dark states, as well as its extinction ratio in different wavelength bands.

[0090] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing a microstructured polarizer, characterized in that, The preparation method includes the following steps: Step 1: Use an aqueous solution of optical cleaning agent to ultrasonically clean the substrate with one side coated with an antireflection film for a first preset time. Then use acetone and alcohol to wash off the aqueous solution of optical cleaning agent on the substrate. Place the cleaned substrate in an oven at a first preset temperature for drying. Step 2: Dissolve the polarizing light-absorbing dye in dimethylformamide at a preset weight ratio to prepare an orientation solution. Spin-coat the orientation solution onto the cleaned substrate. Then place the substrate on a test bench at a second preset temperature and heat for a second preset time to form an orientation layer. Step 3: Irradiate the alignment layer with linearly polarized ultraviolet light to obtain an alignment layer with a programmable structured polarization orientation. Step 4: Mix liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 and dissolve them in toluene solution to prepare liquid crystal polymer solution. Spin-coat the liquid crystal polymer onto an alignment layer with a programmable structured polarization orientation to obtain a liquid crystal polymer monomer coating. Step 5: Use a photocuring process to process the liquid crystal polymer monomer coating to obtain a liquid crystal polymer film; Step 6: Deposit polarizing light-absorbing dyes on the liquid crystal polymer film to form a polarizing light-absorbing dye coating, thus obtaining a microstructured polarizer.

2. The method for preparing a microstructured polarizer according to claim 1, characterized in that, In step 1, the antireflective coating operates in the wavelength range of 400-700nm, and the first preset time is 15-20min.

3. The method for preparing a microstructured polarizer according to claim 2, characterized in that, In step 1, the first preset temperature is 50-200℃.

4. The method for preparing a microstructured polarizer according to claim 3, characterized in that, In step 2, the weight ratio of the polarizing light-absorbing dye to dimethylformamide is 0.5 wt%.

5. The method for preparing a microstructured polarizer according to claim 4, characterized in that, In step 2, the second preset temperature is 50-200℃ and the second preset time is 1-60min.

6. The method for preparing a microstructured polarizer according to claim 5, characterized in that, In step 4, the mixing mass ratio of liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 is 96:

4.

7. The method for preparing a microstructured polarizer according to claim 6, characterized in that, In step 4, the mixture of liquid crystal monomer RM57 and ultraviolet photoinitiator IG184 is 15 wt% of toluene solvent.

8. The method for preparing a microstructured polarizer according to claim 7, characterized in that, In step 6, the polarizing absorber dye is produced using a mixture of one or more of AD1, Sudan III, and Sudan Black solvents.

9. A microstructure polarizer, characterized in that, The microstructured polarizer is prepared using the method described in any one of claims 1 to 8.

10. An application of a microstructured polarizer, employing the microstructured polarizer of claim 9, characterized in that, The microstructured polarizer is used to capture the polarization information of light.

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