Photonic crystal bionic coated lens and preparation method thereof

Abstract

The present invention discloses a photonic crystal bionic coated lens and a preparation method thereof. The photonic crystal bionic coated lens comprises a lens base and a photonic crystal bionic film covering the lens base; the photonic crystal bionic film has an inverse opal structure. The bionic photonic crystal film with an inverse opal structure provided by the present invention can form hundreds of small hexagonal lenses like a honeycomb on the lens surface, can reflect strong light and stray and scattered light on the surface of an object, and at the same time play a certain role in preventing blue light, avoiding eyeballs from being stimulated by strong light, and is beneficial to protecting the eyes.

Description

Technical Field

[0001] The present invention relates to the field of eyeglass lenses, and in particular to a photonic crystal bionic coated lens and a preparation method thereof. Background Art

[0002] In modern society, people's vision is becoming increasingly problematic due to fatigue caused by excessive use of the eyes and aging, so they need to wear functional lenses to improve their vision. At present, basic eyeglass lenses are mainly divided into optical lenses such as myopia lenses, presbyopia lenses, and sun lenses. These lenses mainly correct human vision through the imaging principle of concave lenses or convex lenses. With the advancement of science and technology, people's requirements for the functions of glasses are also constantly increasing, and eyeglass lens technology has also been continuously developing.

[0003] Ordinary lenses can only meet our daily needs. In special circumstances such as strong ultraviolet radiation, wear and scratches, reflections, glare, and blue light emitted by electronic screens, ordinary lenses will be damaged or even unusable. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of light filtering of existing ordinary lenses and to provide a photonic crystal bionic honeycomb coated lens and a preparation method thereof.

[0005] In order to achieve the above-mentioned object, the present invention provides a photonic crystal bionic coated lens, comprising a lens base layer and a photonic crystal bionic film covering the lens base layer; the photonic crystal bionic film has an inverse opal structure.

[0006] Optionally, the photonic crystal bionic membrane is a honeycomb mesh membrane.

[0007] The present invention also provides a method for preparing the above-mentioned photonic crystal bionic coated lens, comprising:

[0008] A monodisperse microsphere suspension is prepared, and a lens substrate is placed in the monodisperse microsphere suspension in a direction perpendicular to the liquid surface of the monodisperse microsphere suspension, so that the monodisperse microspheres self-assemble on the surface of the lens substrate to form an opal template with a photonic crystal array;

[0009] A chitosan aqueous solution containing 0.2% to 2% chitosan in acetic acid is prepared, and the solution is mixed with a glutaraldehyde solution in a mass ratio of 100:(1-5) to form a precursor solution, which is infiltrated into the gaps of the opal template until the opal template becomes transparent;

[0010] The precursor solution filled in the opal template is subjected to a cross-linking reaction, and the front surface of the lens substrate is placed in a strong polar solvent to remove the opal template, thereby forming a photonic crystal biomimetic film with an inverse opal structure on the lens substrate.

[0011] Optionally, the monodisperse microspheres are any one or more of polystyrene, polymethyl methacrylate, and silicon dioxide.

[0012] Optionally, before preparing the monodisperse microsphere suspension, the monodisperse microspheres are dialyzed with ultrapure water for more than 7 days to clean the monodisperse microspheres; after cleaning, the monodisperse microsphere suspension is prepared using ultrapure water.

[0013] Optionally, the monodisperse microsphere suspension is placed in an oven and dried at a constant temperature of 50° C. to 80° C., so that the monodisperse microspheres are self-assembled on the surface of the lens substrate to form an opal template.

[0014] Optionally, chitosan is dissolved in an acetic acid aqueous solution with a mass fraction of 1%-2%, and stirred at room temperature for 2h-3h to prepare an acetic acid aqueous solution with a mass fraction of 1%-2% chitosan.

[0015] Optionally, the precursor liquid is dropped on the top of the opal template, so that the precursor liquid slowly extends into the gaps of the opal template along the lens substrate.

[0016] Optionally, the lens substrate is placed in an oven at 25° C.-40° C. for 12 hours to dry the lens substrate so that the precursor solution filled in the opal template undergoes a cross-linking reaction.

[0017] Optionally, the highly polar solvent is any one or more of toluene, hydrofluoric acid, and acetone.

[0018] The beneficial effects of the present invention are:

[0019] (1) The bionic photonic crystal film with an inverse opal structure provided by the present invention can form hundreds of small hexagonal lenses in a honeycomb shape on the surface of the lens, which can reflect strong light and stray and scattered light on the surface of objects, and at the same time play a certain role in preventing blue light, thereby avoiding the eyeball from being stimulated by strong light, which is beneficial to protecting the eyes.

[0020] (2) The present invention provides a method for directly preparing a photonic crystal bionic film on a lens substrate without affecting other subsequent coating processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 These are SEM images of the opal structure and inverse opal structure photonic crystals of the present invention.

[0022] Figure 2 It is a schematic diagram of the reflection spectrum test results of the photonic crystal bionic membrane of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In nature, bees have excellent vision. This is because bees' eyes are exposed to strong light for a long time, causing eye burns and blindness, and then they evolve a pair of completely black eyes, which can prevent strong ultraviolet radiation and prevent visible light from directly entering the eyes. The compound eyes of bees are composed of 5,000 small eyes, each of which has a regular shape of a honeycomb hexagon. The present invention adopts bionic technology to form hundreds of small hexagonal lenses with a honeycomb structure on the surface of the lens base to form a bionic membrane. When the light source enters the eye, the small lenses with a honeycomb structure reflect the strong light and the stray light and scattered light on the surface of the object, so that the light becomes parallel light and concentric light, avoiding the stimulation of the human eye by strong light. At the same time, due to Bragg diffraction, the honeycomb photonic crystal structure can diffract electromagnetic waves in the blue light band, playing a role in preventing blue light.

[0025] The present invention discloses a photonic crystal bionic coated lens, comprising a lens base and a photonic crystal bionic film covering the lens base. The photonic crystal bionic film has an inverse opal structure, which is a mesh film composed of a plurality of honeycomb hexagonal structures as small lenses, which are closely arranged in the same plane. The present invention forms a photonic crystal opal template by self-assembling monodisperse microspheres on the lens base, then slowly infiltrates a chitosan precursor solution into the gaps of the crystal array on the lens base, and finally places the lens base in a solvent to remove the microsphere template, thereby obtaining an ordered porous chitosan photonic crystal film with an inverse opal structure. The preparation process specifically comprises the following steps:

[0026] (1) Forming an opal template on the surface of the lens substrate

[0027] The monodisperse microspheres are dialyzed with ultrapure water for more than 7 days to clean the monodisperse microspheres, with a conventional concentration of 15%-20%; after cleaning, ultrapure water is added to dilute the monodisperse microsphere solution to 0.5% to obtain a monodisperse microsphere suspension. Optionally, the monodisperse microspheres are any one or more of polystyrene, polymethyl methacrylate, and silica. The clean lens substrate is placed in the monodisperse microsphere suspension in a direction perpendicular to the liquid surface of the monodisperse microsphere suspension, and heated and dried at a constant temperature of 60°C in an oven to allow the monodisperse microspheres to self-assemble on the surface of the lens substrate to form a monodisperse microsphere suspension. Figure 1 The method provided by the present invention can form a photonic crystal biomimetic film on a lens substrate made of various materials such as glass and resin.

[0028] (2) Filling the opal template with precursor liquid

[0029] Dissolve chitosan in 2% acetic acid aqueous solution, stir at room temperature for 3 hours, prepare 2% chitosan acetic acid aqueous solution, mix the solution with 1% glutaraldehyde solution in a mass ratio of 100:(1-5) to form a precursor solution, drop the precursor solution on the top of the opal template, and allow the precursor solution to slowly extend into the gaps of the opal template along the lens base layer. Since the precursor solution and the opal template have the same refractive index, the precursor solution can fill the irregular gaps in the opal template and make the opal template transparent.

[0030] (3) Forming a photonic crystal biomimetic film with an inverse opal structure on the lens substrate

[0031] The lens substrate was placed in an oven at 30°C for 12 hours to dry the lens substrate, so that the precursor solution filled in the opal template undergoes a cross-linking reaction. The front surface of the lens substrate was placed in a strong polar solvent for 15 seconds to remove the opal template, and a layer such as Figure 1 The photonic crystal biomimetic film with an inverse opal structure shown in (b) is shown in FIG. 1. Optionally, the strong polar solvent is any one or more of toluene, hydrofluoric acid, and acetone.

[0032] Example 1

[0033] S1, forming an opal template on the surface of the lens substrate;

[0034] S1.1, thorough cleaning of monodisperse microspheres: 150 nm monodisperse polystyrene microspheres were dialyzed against ultrapure water for 14 days;

[0035] S1.2, preparation of monodisperse microsphere suspension: take 10 mL of dialyzed monodisperse polystyrene solution into a beaker and dilute it to about 0.5% with ultrapure water;

[0036] S1.3, self-assembly coating on the surface of the lens substrate: vertically place the clean lens substrate in a monodisperse polystyrene microsphere suspension, heat and dry it at a constant temperature of 60°C in a sealed oven, and the microspheres form a regular photonic crystal array, i.e., an opal template, through self-assembly.

[0037] S2, filling the opal template with the precursor solution;

[0038] S2.1, dissolving chitosan in a 2% acetic acid aqueous solution, stirring at room temperature for 3 h to prepare a 2% uniform solution, and then mixing with a 1% glutaraldehyde solution at a mass ratio of 100:1 to form a precursor solution;

[0039] S2.2, place the lens substrate covered with the polystyrene opal template on a horizontal operating table with the front surface facing upward, drop the precursor obtained in S2.1 on the opal template, and let the precursor slowly flow down along the lens substrate and penetrate into the gaps of the opal template until the template becomes transparent;

[0040] S3, forming a photonic crystal biomimetic film with an inverse opal structure on the lens substrate:

[0041] S3.1, placing the lens substrate in an oven at 30°C for 12 hours to allow the precursor solution filled in the opal template to undergo a cross-linking reaction;

[0042] S3.2, placing the front surface of the cross-linked lens in toluene for 15 seconds to remove the polystyrene opal template, and obtaining a lens with an inverse opal structure photonic crystal bionic honeycomb mesh film.

[0043] Example 2

[0044] The “150 nanometer monodisperse polystyrene microspheres” in Example 1 were replaced by “200 nanometer monodisperse polymethyl methacrylate microspheres”; the “mass ratio of 100:1” in S2.1 was replaced by “mass ratio of 100:3”; other conditions remained unchanged.

[0045] Example 3

[0046] The “150 nanometer monodisperse polystyrene microspheres” in Example 1 were replaced by “250 nanometer monodisperse polystyrene microspheres”; the “mass ratio of 100:1” in S2.1 was replaced by “mass ratio of 100:5”; other conditions remained unchanged.

[0047] Table 1 UV illumination test

[0048]

[0049] The ultraviolet illumination test results of the photonic crystal biomimetic films obtained in Example 1, Example 2 and Example 3 are shown in Table 1. According to Table 1, compared with ordinary lenses, the light transmittance of the lenses obtained in Examples 1 to 3 of the present invention is almost unchanged, and the UV365 shielding efficiency of the photonic crystal biomimetic film in Example 1 can reach about 78%; the UV365 shielding efficiency of the photonic crystal biomimetic film in Example 2 is about 40%; and the UV365 shielding efficiency of the photonic crystal biomimetic film in Example 3 is about 31%.

[0050] like Figure 2 As shown, the photonic crystal bionic membrane prepared in Example 1 has an effective shielding band of about 350 nanometers; the photonic crystal bionic membrane prepared in Example 2 has an effective shielding band of about 400 nanometers, and the blue light shielding efficiency in this band is about 7%; the photonic crystal bionic membrane prepared in Example 3 has an effective shielding band of about 460 nanometers, and the blue light shielding efficiency in this band is about 7%.

[0051] In summary, the present invention provides a photonic crystal bionic coating lens and a preparation method thereof. The photonic crystal bionic coating is inspired by the compound eyes of bees and the regularly shaped honeycombs. A honeycomb mesh photonic crystal bionic film is directly prepared on the lens base layer. This photonic crystal bionic film is plated on the lens base layer, which is equivalent to forming hundreds of small lenses with a honeycomb hexagonal structure on the surface of the lens base layer. When the light source enters the eye, the strong light and the stray and scattered light on the surface of the object are reflected by Bragg through hundreds of small lenses with honeycomb structures, so that the light becomes parallel light and concentric light. In this way, the human eye avoids the stimulation of strong light and is greatly protected from the harm of strong light.

[0052] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A photonic crystal bionic coating lens, characterized in that: The invention comprises a lens base and a photonic crystal bionic film covering the lens base; the photonic crystal bionic film has an inverse opal structure; the photonic crystal bionic film is a honeycomb mesh film; and the preparation method of the photonic crystal bionic coated lens comprises: A monodisperse microsphere suspension is prepared, and a lens substrate is placed in the monodisperse microsphere suspension in a direction perpendicular to the liquid surface of the monodisperse microsphere suspension, so that the monodisperse microspheres are self-assembled on the surface of the lens substrate to form an opal template with a photonic crystal array; an acetic acid aqueous solution of chitosan with a mass fraction of 0.2% to 2% is prepared, and the solution is mixed with a glutaraldehyde solution in a mass ratio of 100:(1-5) to form a precursor solution, which is infiltrated into the gaps of the opal template until the opal template becomes transparent; The precursor solution filled in the opal template is subjected to a cross-linking reaction, and the front surface of the lens substrate is placed in a strong polar solvent to remove the opal template, thereby forming a photonic crystal biomimetic film with an inverse opal structure on the lens substrate.

2. The photonic crystal bionic coating lens according to claim 1, characterized in that: The monodisperse microspheres are any one or more of polystyrene, polymethyl methacrylate and silicon dioxide.

3. The photonic crystal bionic coating lens according to claim 1, characterized in that: Before preparing the monodisperse microsphere suspension, the monodisperse microspheres were dialyzed with ultrapure water for more than 7 days to clean the monodisperse microspheres; After cleaning, prepare a monodisperse microsphere suspension using ultrapure water.

4. The photonic crystal bionic coating lens according to claim 1, characterized in that: The monodisperse microsphere suspension is placed in an oven and dried at a constant temperature of 50°C-80°C, so that the monodisperse microspheres are self-assembled on the surface of the lens substrate to form an opal template.

5. The photonic crystal bionic coating lens according to claim 1, characterized in that: Chitosan is dissolved in an acetic acid aqueous solution with a mass fraction of 1%-2%, and stirred at room temperature for 2h-3h to prepare an acetic acid aqueous solution of chitosan with a mass fraction of 1%-2%.

6. The photonic crystal bionic coating lens according to claim 1, characterized in that: The precursor liquid is dropped on the top of the opal template, so that the precursor liquid slowly extends into the gap of the opal template along the lens base layer.

7. The photonic crystal bionic coating lens according to claim 1, characterized in that: The lens substrate is placed in an oven at 25°C-40°C for 12 hours to dry the lens substrate and allow the precursor solution filled in the opal template to undergo a cross-linking reaction.

8. The photonic crystal bionic coating lens according to claim 1, characterized in that: The strong polar solvent is any one or more of toluene, hydrofluoric acid and acetone.

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