Pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal

Abstract

The invention relates to a polarization spectrometer, in particular to a pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal. The polarization spectrometer is prepared by adopting the following method: step 1, regulating and controlling the screw pitch of cholesteric cellulose chiral liquid crystal; step 2, preparing a flexible PDMS film; step 3, preparing a patterned PDMS through hole film; 4, treating the surface of the glass sheet; step 5, filling cholesteric cellulose chiral liquid crystals; and step 6, orienting the cholesteric cellulose chiral liquid crystal to obtain the pitch-adjustable polarization spectrometer with the film-shaped patterned cholesteric cellulose chiral liquid crystal. The problems that a traditional small-molecule liquid crystal chiral agent is difficult to regulate and control the screw pitch of the cholesteric phase cellulose chiral liquid crystal and easy to agglomerate can be solved, and simple preparation of the screw pitch-adjustable cholesteric phase cellulose chiral liquid crystal is achieved; and meanwhile, transmission of right-handed circularly polarized light and selective reflection of left-handed circularly polarized light are realized by utilizing the patterned cholesteric cellulose chiral liquid crystal.

Description

Technical Field

[0001] The present invention relates to a polarization spectroscope, and particularly to a pitch-tunable polarization spectroscope based on cholesteric cellulose chiral liquid crystal. Background Art

[0002] Due to its unique chiral Bragg helical structure, cholesteric chiral liquid crystal can produce intelligent responses to external stimuli such as electric field, magnetic field, temperature and pressure, and thus has received extensive attention in the fields of intelligent display, intelligent medical treatment and intelligent sensing.

[0003] As a new type of liquid crystal that can maintain the chiral Bragg helical structure in the solid state, cholesteric cellulose chiral liquid crystal not only provides a stable medium for self-assembled nanoparticles, but also has excellent flexible and wearable properties, and has broad application prospects in the fields of new generation soft robots, human-computer interaction and intelligent sensing. The chiral structure of cholesteric cellulose chiral liquid crystal senses the externally applied polarization spectrum information through pitch regulation. At the same time, based on its intrinsic left-handed helical structure, it selectively reflects left-handed circularly polarized light and transmits right-handed circularly polarized light. Therefore, as the core optical parameter of cholesteric cellulose chiral liquid crystal, the pitch can directly affect its ability to sense polarization spectrum information.

[0004] However, since cholesteric cellulose chiral liquid crystal is an aqueous liquid crystal and the size of its liquid crystal units is in the nanometer range, the method of adding a chiral agent to traditional small molecule liquid crystals to regulate the pitch not only cannot regulate the pitch of cholesteric cellulose chiral liquid crystal, but also causes serious aggregation problems of cholesteric cellulose chiral liquid crystal.

[0005] At the same time, since cholesteric cellulose chiral liquid crystal needs to go through the intrinsic glass state during the film-forming process, micron-scale liquid crystal domain defects are likely to occur, so it is difficult to achieve high-precision polarization spectrum information sensing, which greatly limits the practical application of cholesteric cellulose chiral liquid crystal polarization spectroscope. Summary of the Invention

[0006] The object of the present invention is to solve the technical problems that the pitch of existing cholesteric cellulose chiral liquid crystal is difficult to regulate, and liquid crystal domain defects are likely to occur during film formation, making it difficult to achieve high-precision polarization spectrum information sensing, which greatly limits the practical application of cholesteric cellulose chiral liquid crystal polarization spectroscope, and to provide a pitch-tunable polarization spectroscope based on cholesteric cellulose chiral liquid crystal.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A pitch-tunable polarization spectroscope based on cholesteric cellulose chiral liquid crystal, which is characterized in that:

[0009] It includes a glass sheet and a thin-film patterned cholesteric cellulose chiral liquid crystal provided on the surface of the glass sheet; the pitch of the patterned cholesteric cellulose chiral liquid crystal is regulated by adding different doses of glycerol to transmit right-handed circularly polarized light and selectively reflect left-handed circularly polarized light.

[0010] Meanwhile, the aforementioned pitch-adjustable polarization spectroscope based on cholesteric cellulose chiral liquid crystal is prepared by the following method:

[0011] Step 1: Regulate the pitch of cholesteric cellulose chiral liquid crystal

[0012] Add three different doses of glycerol into three identical cholesteric cellulose chiral liquid crystals respectively, regulate the pitch of the corresponding cholesteric cellulose chiral liquid crystals respectively, then stir them evenly and let them stand for the first set time to remove air bubbles, obtaining three cholesteric cellulose chiral liquid crystals with different colors and evenly dispersed.

[0013] Step 2: Prepare a flexible PDMS (polydimethylsiloxane) film

[0014] Mix the PDMS prepolymer and the curing agent according to the set mass ratio to obtain a PDMS solution, and then drop it onto a glass substrate; after the PDMS solution is evenly dispersed, heat the glass substrate with the dropped PDMS solution at the set temperature for the second set time to form a PDMS film on the glass substrate, and then take it off the glass substrate to obtain a flexible PDMS film.

[0015] Step 3: Prepare a patterned PDMS through-hole film

[0016] Remove the redundant areas on the flexible PDMS film according to the designed patterned structure to obtain a patterned PDMS through-hole film; the patterned PDMS through-hole film includes a plurality of through-hole structures distributed in an array.

[0017] Step 4: Surface treatment of the glass sheet

[0018] Perform surface treatment on the pre-prepared glass sheet to obtain a glass sheet meeting the set hydrophilicity requirements.

[0019] Step 5: Pour cholesteric cellulose chiral liquid crystal

[0020] Place the patterned PDMS through-hole film on the surface-treated glass sheet; then pour the three cholesteric cellulose chiral liquid crystals with different colors into the corresponding through-hole structures in sequence according to the pattern of the patterned PDMS through-hole film to obtain a patterned cholesteric cellulose chiral liquid crystal-PDMS structure.

[0021] Step 6: Orient cholesteric cellulose chiral liquid crystal

[0022] The patterned cholesteric cellulose chiral liquid crystal-PDMS structure is left standing in an environment with a set humidity for a third set time, so that the liquid crystal domains in the patterned cholesteric cellulose chiral liquid crystal fuse with each other, achieving a uniform orientation of the patterned cholesteric cellulose chiral liquid crystal; after the patterned cholesteric cellulose chiral liquid crystal forms a film, the patterned PDMS through-hole membrane is removed, and a glass sheet with a thin-film patterned cholesteric cellulose chiral liquid crystal retained is obtained, that is, a pitch-tunable polarization spectroscope.

[0023] Further, step 1 is specifically as follows: According to the ratio of adding 9 μL - 11 μL, 19 μL - 21 μL, and 29 μL - 31 μL of glycerol to every 100 μL of cholesteric cellulose chiral liquid crystal, 9 μL - 11 μL, 19 μL - 21 μL, and 29 μL - 31 μL of three different dosages of glycerol are respectively added to 100 μL of three cholesteric cellulose chiral liquid crystals with a concentration of 4% - 6%. The pitch of the corresponding cholesteric cellulose chiral liquid crystals is respectively regulated, and then they are respectively stirred for 4 minutes - 6 minutes and then left standing for 20 minutes - 40 minutes to obtain three uniformly dispersed cholesteric cellulose chiral liquid crystals of blue, green, and red.

[0024] Further, step 1 is specifically as follows: 10 μL, 20 μL, and 30 μL of three different dosages of glycerol are respectively added to 100 μL of three cholesteric cellulose chiral liquid crystals with a concentration of 5%. The pitch of the corresponding cholesteric cellulose chiral liquid crystals is respectively regulated, and then they are respectively stirred for 5 minutes and left standing for 30 minutes to remove air bubbles, obtaining three uniformly dispersed cholesteric cellulose chiral liquid crystals of blue, green, and red.

[0025] Further, step 3 is specifically as follows: A punching tool with an inner diameter of 200 μm - 500 μm is used to remove redundant regions on the flexible PDMS membrane according to the designed patterned structure, obtaining a patterned PDMS through-hole membrane.

[0026] Further, step 4 is specifically as follows: Step 4.1: First, the pre-prepared glass sheet is put into a mixed solution of acetone and ethanol with a mass ratio of 1:1 and ultrasonically treated for at least 8 minutes, and the surface stains of the glass sheet are cleaned with deionized water, and then the deionized water on the surface of the glass sheet is blown dry with an air gun to complete the surface cleaning treatment of the glass sheet;

[0027] Step 4.2: Then, the cleaned glass sheet is put into a mixed solution of concentrated sulfuric acid and hydrogen peroxide and soaked for at least 8 minutes to fully oxidize the surface of the glass sheet. Finally, it is ultrasonically treated with ethanol for at least 15 minutes and blown dry with nitrogen to obtain a glass sheet that meets the set hydrophilicity requirements, so as to increase the anchoring effect between the cholesteric cellulose chiral liquid crystal and the glass sheet.

[0028] Preferably, in step 4.1, a pre-prepared glass slide is placed in a mixed solution of acetone and ethanol and ultrasonically treated for 10 minutes. The mass ratio of acetone to ethanol in the mixed solution of acetone and ethanol is 1:1;

[0029] In step 4.2, the glass slide after surface cleaning treatment is placed in a mixed solution of concentrated sulfuric acid and hydrogen peroxide, soaked for 10 minutes, and the surface of the glass slide is oxidized. Finally, it is ultrasonically treated with ethanol for 20 minutes. The volume ratio of concentrated sulfuric acid to hydrogen peroxide in the mixed solution of concentrated sulfuric acid and hydrogen peroxide is 3:7.

[0030] Furthermore, in step 5, the glass slide with the patterned PDMS through-hole membrane is placed in a plasma cleaner for an oxygenation process of at least 3 minutes, preferably 5 minutes.

[0031] Furthermore, in step 6, the patterned cholesteric cellulose chiral liquid crystal-PDMS structure is left standing in an environment with a humidity of 80±5% for at least 20 hours. In step 2, the PDMS prepolymer and the curing agent are mixed according to a mass ratio of 10:1; the glass substrate with the PDMS solution dropped thereon is heated at 80±5°C for at least 1 hour.

[0032] Preferably, in step 6, the patterned cholesteric cellulose chiral liquid crystal-PDMS structure is left standing in an environment with a humidity of 80% for 24 hours. In step 2, the PDMS prepolymer and the curing agent are mixed according to a mass ratio of 10:1; the glass substrate with the PDMS solution dropped thereon is heated at 80°C for 2 hours.

[0033] The beneficial effects of the present invention are:

[0034] 1. The present invention uses the method of adding glycerol to change the hydrogen bond force between liquid crystal molecules, thereby regulating the pitch of cholesteric cellulose chiral liquid crystal, solving the problems that traditional small molecule liquid crystal chiral agents are difficult to regulate the pitch of cholesteric cellulose chiral liquid crystal and are prone to agglomeration, realizing the simple preparation of cholesteric cellulose chiral liquid crystal with adjustable pitch, and this pitch regulation method is compatible with sensing elements such as micro-nano optical fibers, quantum dots, and metal nanoparticles, and has high expandability in the field of high-performance optical sensing.

[0035] 2. The cholesteric cellulose chiral liquid crystal prepared by the present invention has a uniform orientation on the order of hundreds of micrometers, overcomes the defects of liquid crystal domain defects and relatively wide response spectral bands of traditional cholesteric cellulose chiral liquid crystals, and effectively improves the optical performance of the cholesteric cellulose chiral liquid crystal polarizing spectroscope.

[0036] 3. The present invention uses a patterned PDMS through-hole membrane and a highly hydrophilic glass sheet to orient cholesteric cellulose chiral liquid crystals, which can avoid the coffee ring effect during the film formation of traditional cholesteric cellulose chiral liquid crystals, achieve the convenient preparation of arrays of various patterns, and at the same time, the patterned PDMS through-hole membrane can be reused, its preparation method is more convenient, the cost can be significantly reduced, and it is easy to realize batch industrial production.

[0037] 4. The present invention realizes the regulation of polarization spectral information by controlling the pitch of cholesteric cellulose chiral liquid crystals. At the same time, the patterned cholesteric cellulose chiral liquid crystals are used to achieve the transmission of right-handed circularly polarized light and the selective reflection of left-handed circularly polarized light, thereby completing the integrated regulation of polarization spectral information. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is the preparation flow chart of an embodiment of a pitch-tunable polarization spectroscope based on cholesteric cellulose chiral liquid crystals of the present invention;

[0039] Figure 2 is the schematic diagram of the preparation process of an embodiment of a pitch-tunable polarization spectroscope based on cholesteric cellulose chiral liquid crystals of the present invention;

[0040] Figure 3 is the reflection micrograph of cholesteric cellulose chiral liquid crystals after pitch regulation in an embodiment of the present invention under a 50 μm scale, where (a), (b), and (c) are the reflection micrographs of pitch-tunable blue, green, and red cholesteric cellulose chiral liquid crystals respectively;

[0041] Figure 4 is the reflection micrograph of uniformly oriented cholesteric cellulose chiral liquid crystals in an embodiment of the present invention under a 50 μm scale, where (a), (b), and (c) are the reflection micrographs of uniformly oriented blue, green, and red cholesteric cellulose chiral liquid crystals respectively.

[0042] BRIEF DESCRIPTION OF THE DRAWINGS: 1 - glass sheet, 2 - patterned PDMS through-hole membrane, 3 - patterned cholesteric cellulose chiral liquid crystal. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] To make the objectives, advantages, and features of the present invention clearer, the following further details the pitch-tunable polarization spectroscope based on cholesteric cellulose chiral liquid crystals proposed by the present invention with reference to the accompanying drawings and specific embodiments. According to the following specific embodiments, the advantages and features of the present invention will be clearer.

[0044] See Figure 1 , a pitch-tunable polarization spectroscope based on cholesteric cellulose chiral liquid crystals in this embodiment is specifically prepared by the following method:

[0045] (1) Adjusting the pitch of cholesteric cellulose chiral liquid crystal

[0046] According to the ratio of adding 9 μL - 11 μL, 19 μL - 21 μL, and 29 μL - 31 μL of glycerol to every 100 μL of cholesteric cellulose chiral liquid crystal, three different doses of glycerol, namely 9 μL - 11 μL, 19 μL - 21 μL, and 29 μL - 31 μL, are respectively added to three 100 μL cholesteric cellulose chiral liquid crystals with a concentration of 4% - 6%. In this embodiment, preferably: 10 μL, 20 μL, and 30 μL of three different doses of glycerol are respectively added to three 100 μL cholesteric cellulose chiral liquid crystals with a concentration of 5%, and the pitch of the corresponding cholesteric cellulose chiral liquid crystals is respectively adjusted. Then, they are respectively stirred for 4 minutes - 6 minutes and left to stand for 20 minutes - 40 minutes. In this embodiment, it is preferably stirred for 5 minutes and left to stand for 30 minutes to remove air bubbles, thereby obtaining three uniformly dispersed cholesteric cellulose chiral liquid crystals of blue, green, and red. Figure 3 The reflection micrographs of the three cholesteric cellulose chiral liquid crystals of blue, green, and red are shown. From Figure 3 It can be seen that the three cholesteric cellulose chiral liquid crystals respectively respond to different spectra, that is, present different colors, realizing the convenient regulation of the pitch.

[0047] (2) Preparing a flexible PDMS film

[0048] The PDMS prepolymer and the curing agent (Sylgard 184, Dow Corning Corporation) are mixed according to a mass ratio of 10:1 to obtain a prepared PDMS solution, and then the prepared PDMS solution is dropped onto a pre-set glass substrate. After the PDMS solution is uniformly dispersed, the glass substrate with the PDMS solution dropped thereon is heated at 80 ± 5 °C for at least 1 hour. In this embodiment, preferably, it is heated at 80 °C for 2 hours to make the PDMS solution solidify into a PDMS film on the glass substrate. Finally, the PDMS film is torn off from the glass substrate to obtain a flexible PDMS film.

[0049] (3) Preparing a patterned PDMS through-hole film 2

[0050] A punch with an inner diameter of 200 μm - 500 μm is used to remove redundant (i.e., excess) areas on the flexible PDMS film obtained in step 2 according to the designed patterned structure, obtaining a patterned PDMS through-hole film 2, which includes a plurality of through-hole structures distributed in an array.

[0051] (4) Surface treatment of glass sheet 1

[0052] First, place the pre-set glass sheet 1 into a mixed solution of acetone and ethanol with a mass ratio of 1:1 and ultrasonicate for at least 8 minutes, preferably 10 minutes in this embodiment. Then, wash the surface oil stain of the glass sheet 1 with deionized water and dry the deionized water on the glass sheet 1 with an air gun to complete the surface cleaning of the glass sheet 1.

[0053] Then, place the cleaned glass sheet 1 into a mixed solution of concentrated sulfuric acid and hydrogen peroxide (3:7 vol%), soak for at least 8 minutes, preferably 10 minutes in this embodiment, to fully oxidize the surface of the glass sheet 1. Finally, ultrasonicate with ethanol for at least 15 minutes, preferably 20 minutes in this embodiment, and dry with nitrogen to obtain a highly hydrophilic glass sheet 1, so that the hydrophilicity of the glass sheet 1 meets the set requirements, thereby increasing the anchoring effect between the cholesteric cellulose chiral liquid crystal and the glass sheet 1 and avoiding the random arrangement and defects of the cholesteric cellulose chiral liquid crystal in the direction perpendicular to the surface of the glass sheet 1.

[0054] (5) Filling cholesteric cellulose chiral liquid crystal

[0055] Refer to Figure 2 , place the above-mentioned patterned PDMS through-hole membrane 2 on the surface-treated glass sheet 1, and then place it in a plasma cleaner for an oxygenation process for at least 3 minutes, preferably 5 minutes in this embodiment, to increase the adhesion between the patterned PDMS through-hole membrane 2 and the glass sheet 1 and avoid delamination between the patterned PDMS through-hole membrane 2 and the glass sheet 1. Finally, sequentially fill the above-prepared blue, green, and red cholesteric cellulose chiral liquid crystals into the corresponding through-hole structures according to the pattern of the patterned PDMS through-hole membrane 2 to prepare a patterned cholesteric cellulose chiral liquid crystal-PDMS structure.

[0056] (6) Orienting cholesteric cellulose chiral liquid crystal

[0057] Place the above-mentioned patterned cholesteric cellulose chiral liquid crystal-PDMS structure in an environment with a humidity of 80±5% and let it stand for at least 20 hours. A high-humidity environment can promote the self-assembly of liquid crystal molecules. Therefore, in this embodiment, the preferred humidity is 80% and the standing time is 24 hours, so that the liquid crystal domains in the cholesteric cellulose chiral liquid crystal can have sufficient time to fuse with each other, realizing the uniform orientation of the cholesteric cellulose chiral liquid crystal and overcoming the liquid crystal domain defects of traditional cholesteric cellulose chiral liquid crystals. After the above-mentioned cholesteric cellulose chiral liquid crystal forms a film, a thin-film patterned cholesteric cellulose chiral liquid crystal 3 is obtained. Finally, slowly tear off the patterned PDMS through-hole membrane 2 and retain the patterned cholesteric cellulose chiral liquid crystal 3 on the glass sheet 1, thereby obtaining a pitch-tunable polarization spectroscope, which can then utilize the patterned cholesteric cellulose chiral liquid crystal 3 to transmit right-handed circularly polarized light and selectively reflect left-handed circularly polarized light.

[0058] Figure 4The reflected micrograph of a high-precision blue, green, and red cholesteric cellulose chiral liquid crystal device is shown. From Figure 4 It can be seen that the blue, green, and red cholesteric cellulose chiral liquid crystal devices are evenly arranged, overcoming the defects of traditional liquid crystal domains. The present invention can be used to prepare cholesteric cellulose chiral liquid crystals with a high-precision adjustable pitch to achieve uniform orientation.

Claims

1. A pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal, characterized in that: It comprises a glass sheet (1), and a film-shaped patterned cholesteric cellulose chiral liquid crystal (3) arranged on the surface of the glass sheet (1); The pitch of the patterned cholesteric cellulose chiral liquid crystal (3) is regulated by adding different doses of glycerol to transmit right-handed circularly polarized light and selectively reflect left-handed circularly polarized light.

2. A pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal, characterized in that: Prepared by the following method: Step 1, adding three different doses of glycerol to three identical cholesteric cellulose chiral liquid crystals, respectively adjusting the pitches of the corresponding cholesteric cellulose chiral liquid crystals, respectively stirring them evenly, and standing them for a first set time to obtain three different colors of uniformly dispersed cholesteric cellulose chiral liquid crystals; Step 2, mixing the PDMS prepolymer and the curing agent according to a set mass ratio to obtain a PDMS solution, and then dropping the PDMS solution onto the glass substrate; After the PDMS solution is evenly dispersed, the glass substrate with the PDMS solution added thereto is heated at a set temperature for a second set time, so that the PDMS solution on the glass substrate forms a PDMS film, which is then removed from the glass substrate to obtain a flexible PDMS film; Step 3: removing redundant areas on the flexible PDMS membrane according to the designed patterned structure to obtain a patterned PDMS through-hole membrane (2); the patterned PDMS through-hole membrane (2) comprises a plurality of through-hole structures distributed in an array; Step 4: performing surface treatment on the prepared glass sheet (1) to obtain a glass sheet (1) that meets the set hydrophilicity requirements; Step 5, placing the patterned PDMS through-hole membrane (2) on the surface-treated glass sheet (1); and then sequentially injecting three different colors of cholesteric cellulose chiral liquid crystals into the corresponding through-hole structures according to the pattern of the patterned PDMS through-hole membrane (2), to obtain a patterned cholesteric cellulose chiral liquid crystal-PDMS structure; Step 6, placing the patterned cholesteric cellulose chiral liquid crystal-PDMS structure in an environment with a set humidity for a third set time, so that the liquid crystal domains in the patterned cholesteric cellulose chiral liquid crystal (3) merge with each other, thereby achieving a uniform orientation of the patterned cholesteric cellulose chiral liquid crystal (3); After the patterned cholesteric cellulose chiral liquid crystal (3) is formed into a film, the patterned PDMS through-hole film (2) is removed to obtain a glass sheet (1) retaining the thin film-shaped patterned cholesteric cellulose chiral liquid crystal (3), i.e., a pitch-adjustable polarization spectrometer.

3. The pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal according to claim 2, characterized in that: Step 1 is as follows: According to the ratio of adding 9 μl-11 μl, 19 μl-21 μl and 29 μl-31 μl of glycerol to every 100 μl of cholesteric cellulose chiral liquid crystal, three different doses of glycerol, 9 μl-11 μl, 19 μl-21 μl and 29 μl-31 μl, were added to 100 μl of three cholesteric cellulose chiral liquid crystals with a concentration of 4%-6%, and the pitches of the corresponding cholesteric cellulose chiral liquid crystals were adjusted respectively. After stirring for 4 minutes to 6 minutes, they were allowed to stand for 20 minutes to 40 minutes to obtain three uniformly dispersed cholesteric cellulose chiral liquid crystals of blue, green and red.

4. The pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal according to claim 3, characterized in that: Three different doses of glycerol, 10 μl, 20 μl and 30 μl, were added to 100 μl of three cholesteric cellulose chiral liquid crystals with a concentration of 5% each, and the pitches of the corresponding cholesteric cellulose chiral liquid crystals were adjusted respectively. They were then stirred for 5 minutes and allowed to stand for 30 minutes to obtain three uniformly dispersed cholesteric cellulose chiral liquid crystals of blue, green and red.

5. The pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal according to claim 4, characterized in that: Step 3 is as follows: Using a puncher to remove redundant areas on the flexible PDMS membrane according to the designed patterned structure, thereby obtaining a patterned PDMS through-hole membrane (2); The inner diameter of the punch is 200 microns to 500 microns.

6. The pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal according to any one of claims 2 to 5, characterized in that: Step 4 is as follows: Step 4.1, firstly, placing the prepared glass sheet (1) in a mixed solution of acetone and ethanol for ultrasonic treatment for at least 8 minutes, and then cleaning the surface stains of the glass sheet (1) with deionized water, and then drying the deionized water on the surface of the glass sheet (1) to complete the surface cleaning of the glass sheet (1); Step 4.2: Then, the glass sheet (1) after the surface cleaning treatment is placed in a mixed solution of concentrated sulfuric acid and hydrogen peroxide and immersed for at least 8 minutes to perform surface oxidation treatment on the glass sheet (1). Finally, it is ultrasonicated with ethanol for at least 15 minutes and blown dry with nitrogen to obtain a glass sheet (1) that meets the set hydrophilicity requirements.

7. The pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal according to claim 6, characterized in that: In step 4.1, the prepared glass sheet (1) is first placed in a mixed solution of acetone and ethanol and ultrasonicated for 10 minutes, wherein the mass ratio of acetone to ethanol in the mixed solution is 1:1; In step 4.2, the glass sheet (1) after the surface cleaning treatment is then placed in a mixed solution of concentrated sulfuric acid and hydrogen peroxide and immersed for 10 minutes to perform surface oxidation treatment on the glass sheet (1), and finally ultrasonicated with ethanol for 20 minutes; the volume ratio of concentrated sulfuric acid to hydrogen peroxide in the mixed solution of concentrated sulfuric acid and hydrogen peroxide is 3:

7.

8. The pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal according to claim 7, characterized in that: In step 5, the glass sheet (1) on which the patterned PDMS through-hole membrane (2) is placed is placed in a plasma cleaning machine for an oxygenation process for at least 3 minutes.

9. The pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal according to claim 8, characterized in that: In step 6, the patterned cholesteric cellulose chiral liquid crystal-PDMS structure is placed in an environment with a humidity of 80±5% for at least 20 hours; In step 2, the PDMS prepolymer and the curing agent are mixed in a mass ratio of 10:1; and the glass substrate with the PDMS solution added thereto is heated at 80±5° C. for at least 1 hour.

10. The pitch-adjustable polarization spectrometer based on cholesteric cellulose chiral liquid crystal according to claim 9, characterized in that: In step 6, the patterned cholesteric cellulose chiral liquid crystal-PDMS structure is placed in an environment with a humidity of 80% for 24 hours; In step 2, the PDMS prepolymer and the curing agent are mixed in a mass ratio of 10:1; and the glass substrate with the PDMS solution added thereto is heated at 80° C. for 2 hours.

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