KR20190040681A - Multifocal intraocular lens - Google Patents

Abstract

Various embodiments of the present invention relates to a multifocal intraocular lens. The present invention aims to provide a polarization directed flat lens type and/or a meta lens type multifocal intraocular lens for cataract surgery or vision correction. To this end, the present invention includes a polarization directed flat lens collecting a part of light, as a convex lens, at a focal distance +f according to the polarization state of an incident light beam and diffracting a part of light, as a concave lens, at a focal distance -f; and a convex lens attached to one surface or the other surface of the polarization directed flat lens, and discloses the multifocal intraocular lens in which at least two focal distances, f1 and f2 are formed by the combination of the polarization directed flat lens and the convex lens.

Description

{Multifocal intraocular lens}

Various embodiments of the present invention are directed to a multifocal intraocular lens.

In general, the human eye is very similar to the structure and function of the camera, and a lens having a convex lens-like transparent structure is formed at the rear of the eye lens to function as a camera lens. Such a lens functions as aging, external damage, A cataract is a disease that causes blurred vision due to factors such as drug side effects, radiation exposure, exposure to various harmful electromagnetic waves, and causes deterioration of vision.

The treatment of cataract has been performed by the drug treatment method and the surgical treatment method. There are various drug treatment methods in the market, but until now, the drug treatment has not been able to replace the surgical treatment Finally, the treatment of cataracts ultimately depends on surgical treatment and the direction of development is mainly based on surgical aspects.

The procedure of cataract surgery consists of two steps. First, it removes the opacifying lens and the step of implanting an intraocular lens that replaces the function of the lens that focuses on the retina. In the cataract surgery method, a surgical procedure is performed in which a cloudy lens is removed by a method such as ultrasonic emulsification or the like, and then a predetermined type of intraocular lens is inserted into the eyeball.

Here, the general intraocular lens is manufactured with a short focal length, and the distance vision is improved satisfactorily, but a magnifying glass is needed to focus on the near vision. On the other hand, the multifocal intraocular lens (IOL) has been developed to compensate for the disadvantages of cataract surgery. It is designed to focus on the intraocular lens and to improve distance and near vision without glasses after surgery.

These IOLs can be classified as anterior interchangeable lens and posterior interchangeable lens depending on the insertion position and can be classified into hard and soft intraocular lenses depending on whether they can be folded in half at the time of insertion. Polymethyl methacrylate (PCM) material is used, and the soft intraocular lens is generally made of silicone material or acrylic material.

Most of the intraocular lenses currently in use are posterior interchangeable lenses, and most of the soft intraocular lenses that can be folded to less than 3 mm are used to allow insertion into the eye even when the cornea or sclera is incised at about 3 mm during surgery.

However, in the conventional intraocular lens and cataract surgery methods, the incision length of the cornea is required to be about 3 mm or more for inserting the intraocular lens, so that astigmatism is more likely to occur after the operation.

Furthermore, the conventional multifocal intraocular lens has an optical / mechanical structure that adjusts the diffraction function and the refractive function so as to be visible both at a distance and at a close distance. Due to the limitation of its mechanical / physical constitution, There was a problem.

The above-described information disclosed in the background of the present invention is only for improving the understanding of the background of the present invention, and thus may include information not constituting the prior art.

SUMMARY OF THE INVENTION The present invention provides a multifocal intraocular lens for cataract surgery or for the correction of visual acuity. That is, a problem to be solved according to various embodiments of the present invention is to solve the problem of combining a polarization directed flat lens and a convex lens in the form of a film or a thin film or a polarization directing flat lens and a meta lens And to provide a flexible multifocal intraocular lens of the type described above.

The multifocal intraocular lens according to various embodiments of the present invention collects a part of light as a convex lens at a focal length + f according to the polarization state of an incident light beam and diffracts another part of light as a concave lens at a focal length -f Giving polarized directivity flat lens; And a convex lens attached to one surface or the other surface of the polarizing directional flat lens such that at least two focal lengths f1 and f2 are formed by the combination of the polarizing directional flat lens and the convex lens.

The polarization-directing flat lens may be located inside the convex lens.

The convex lens may be formed of polymethylmethacrylate (PMMA), polycarbonate (PC), cycloolefin copolymer (COC), polyethylene terephthalate (PET), or silicone.

Wherein the polarization-directing flat lens comprises: a substrate; And a photo-aligned liquid crystal polymer layer in the form of a three-dimensional pattern deposited on one side of the substrate to spatially change the geometric phase shift.

The substrate may be formed of quartz, glass, polymethylmethacrylate (PMMA), polycarbonate (PC), cycloolefin copolymer (COC), polyethylene terephthalate (PET), or silicone.

The multifocal intraocular lens according to various embodiments of the present invention collects a part of light as a convex lens at a focal length + f according to the polarization state of an incident light beam and diffracts another part of light as a concave lens at a focal length -f Giving polarized directivity flat lens; And a meta lens attached to one surface or the other surface of the polarization directional flat lens, wherein at least two focal lengths f1 and f2 are formed by the combination of the polarization directional flat lens and the meta lens.

The meta lens includes a substrate; And metasurfaces formed by arranging a plurality of nano-fins on one side of the substrate.

Various embodiments of the present invention provide a multifocal intraocular lens for cataract surgery or for the correction of vision. That is, various embodiments of the present invention combine a polarization directed flat lens in the form of a film or a thin film with a convex lens, or a polarization directing flat lens with a meta lens to form a new type of flexible multifocus Thereby providing an intraocular lens.

For example, the various embodiments of the present invention include a flat-oriented flat lens in the form of a thin film of a multifocal intraocular lens, thereby reducing the incision length of the cornea during cataract surgery by more than about 3 mm, However, the conventional multifocal intraocular lens has a limited thickness and can be manufactured only up to about + 30D. However, since there is no thickness limit due to the thin film type flat light directing flat lens, it is possible to further increase the dioptric power . As another example, conventional multi-focus intraocular lenses for vision correction contacted the patient's lens to create cataracts. However, various embodiments of the present invention have shown that the multifocal intraocular lens is a very thin and wheelable thin film and a flexible flat- , The probability of occurrence of such cataracts can be remarkably reduced after the correction of the eyesight.

FIGS. 1A and 1B are a cross-sectional view and a plan view showing a configuration of a polarization-directing flat lens, and FIG. 1C is a schematic view showing a focal length by a polarization-directing flat lens.
Fig. 2 is a photograph of a state in which a document is viewed through a polarization-directing flat lens.
3 is a schematic view showing a focal length of a polarizing directional flat lens type multifocal intraocular lens according to various embodiments of the present invention.
4A to 4D are cross-sectional views illustrating a multifocal intraocular lens according to various embodiments of the present invention.
5A and 5B are schematic views showing the focal lengths of the polarization directing flat lens type multifocal intraocular lens and the meta lens type multifocal intraocular lens according to various embodiments of the present invention, respectively.
6A-6D are plan views of a multifocal intraocular lens according to various embodiments of the present invention.
7A to 7D are schematic views illustrating a cataract surgery method using a multifocal intraocular lens according to various embodiments of the present invention.
8 is a schematic view showing a state of vision correction using a multifocal intraocular lens according to various embodiments of the present invention.
FIGS. 9A and 9B and FIGS. 10A and 10B are cross-sectional and plan views illustrating a multifocal intraocular lens according to various embodiments of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more faithful and complete, and will fully convey the scope of the invention to those skilled in the art.

In the following drawings, thickness and size of each layer are exaggerated for convenience and clarity of description, and the same reference numerals denote the same elements in the drawings. As used herein, the term " and / or " includes any and all combinations of one or more of the listed items. In the present specification, the term " connected " means not only the case where the A member and the B member are directly connected but also the case where the C member is interposed between the A member and the B member and the A member and the B member are indirectly connected do.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise, " and / or " comprising, " when used in this specification, are intended to be interchangeable with the said forms, numbers, steps, operations, elements, elements and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers and / or portions, these members, components, regions, layers and / It is obvious that no. These terms are only used to distinguish one member, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

It is to be understood that the terms related to space such as "beneath," "below," "lower," "above, But may be utilized for an easy understanding of other elements or features. Terms related to such a space are for easy understanding of the present invention depending on various process states or use conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature of the drawing is inverted, the element or feature described as "lower" or "below" will be "upper" or "above." Thus, " below " is a concept covering " upper " or " lower ".

Referring to Figs. 1A and 1B, there is shown a cross-sectional view and a plan view of the configuration of a polarization-directing flat lens, and with reference to Fig. 1C, a schematic diagram of the focal length by a polarization-directing flat lens is shown.

Basically, the polarization-directing flat lens is a plane-type, not a curved surface (convex curved surface or concave curved surface) type as in the prior art, and collects a part of light as a convex lens at a focal length + f according to the polarization state of incident light, And serves to diffuse a part of light as a concave lens at a focal length -f.

More specifically, as shown in FIGS. 1A and 1B, the polarization-directing flat lens 100 includes a substrate 110, a linear photo polymerization layer (LPP) formed on the substrate 110 121 and a photo-aligned Liquid Crystal Polymer (LCP) layer 122 formed on the linear photo-polymerizable layer 121. [

The substrate 110 includes a substantially planar first surface (upper surface) 111 and a substantially planar second surface (lower surface) 112 opposite the first surface 111. Substrate 110 may be made of, for example, but not limited to, hard quartz or glass, or soft PMMA (Polymethylmethacrylate), PC (polycarbonate), COC (cycloolefin copolymer), PET (polyethylene terephthalate) And may include silicone.

The linear photopolymerization layer (LPP) 121 may be deposited on the first side (upper surface) 111 of the substrate 110. The linear photopolymerization layer 121 may be formed of an anisotropic polymer that is polymerized by light. For example, the linear photopolymerization layer 121 may be an anisotropic polymer oriented parallel to the flat optical axis of incident linearly polarized ultraviolet . This linear photopolymerization layer 121 linearly polarizes the incident light so that it is emitted.

The optically-oriented liquid crystal polymerized layer (LCP) 122 may be deposited in a three-dimensionally twisted manner on the linear photopolymerizable layer 121. This optically-oriented liquid crystal polymerized layer 122 is particularly suitable for recording of geometric phase holograms. For example, the optically-oriented liquid crystal polymerized layer 122 may include a two-layer stack structure of a right-handed liquid crystal polymerized layer (Right Handed LCP) and a left handed liquid crystal polymerized layer (Left Handed LCP).

Thus, the optically-oriented liquid crystal polymerized layer 122 spatially shifts the geometric phase of the incident light so that the recorded lens surface in hologram form causes perfect diffraction.

(X, y) denotes a linear polarization azimuth angle when light passes through the linear photopolymerization layer 121, and Φ (x, y) denotes a direction in which light passes through the optically-oriented liquid crystal polymerization layer 122 The angle of the optical axis. That is, the polarization-directing flat lens 100 allows the linearly polarized polymer layer 121 to change the linear polarization azimuth angle of the incident light, and then the optically-oriented liquid crystal polymerized layer 122 changes the optical axis angle, And the focal lengths + f and -f at the same time.

Specifically, this polarization-directing flat lens 100 allows the focal distance to be determined according to the polarization state. That is, the polarization-directing flat lens 100 allows to provide a positive or negative focal distance depending on an input polarization state.

For example, with the right circularly polarized light, this lens produces one focal distance (+ f), while the left circularly polarized light has the opposite focal distance (-f).

In addition, unpolarized light allows positive and negative focal lengths to be generated at the same time. The two output wavelengths are circularly polarized and are orthogonal to one another.

As described above, such a polarization-directing flat lens 100 can effectively realize a thin lens. For example, the thickness of the entire lens is within about 0.45 mm, the weight is within 1 g, there is no spherical aberration, The convex lens and the concave lens can be simultaneously performed as described above.

It should be noted that a conventional conventional convex lens or lens array has a thickness of about 5-6 mm, a weight of 4-6 g, and spherical aberration, and can perform only a convex lens function.

As shown in FIG. 1C and described above, the polarization-directing flat lens 100 collects a part of light as a convex lens at the focal length + f according to the polarization state of the incident light, -f. That is, the polarization-directing flat lens 100 allows a focal distance to be formed at + f with respect to the right-hand circularly polarized light, and a focal distance at -f with respect to the left-hand circularly polarized light. In addition, the polarization-directing flat lens 100 operates as a positive lens for 50% of the light (one of the circularly polarized light) for unpolarized light, and 50% of the remaining light (orthogonal polarization) acts as a negative lens . Further, the polarization-directing flat lens 100 has the same mechanism as that of non-polarized light for linearly polarized light (that is, 50% of light is a positive lens and the other 50% is a negative lens).

Referring to FIG. 2, there is shown a photograph of a state in which a document is viewed through a polarization-directing flat lens.

As shown in FIG. 2, when the letters of the document are actually viewed through the polarization-directing flat lens, it can be seen that a letter is enlarged as a convex lens and a letter is partially reduced as a concave lens. Therefore, it can be seen that a multifocal intraocular lens or a multifocal lens can be made using such a polarization-directing flat lens.

On the other hand, various embodiments of the present invention are mainly characterized in that a multifocal lens or a multifocal intraocular lens can be made by combining a polarizing directional flat lens and a convex lens having the above-described characteristics, and will be described.

Referring to FIG. 3, there is shown a schematic view of the focal length of a polarization directing flat lens type multifocal intraocular lens 300 according to various embodiments of the present invention.

As shown in FIG. 3, when the polarization-directing flat lens 100 of the focal length +/- f and the convex lens 200 of the focal length F are combined, new focal lengths f1 and f2 are obtained A focal lens or a multifocal intraocular lens 300 can be manufactured. Here, the combination of the polarization-directing flat lens 100 and the convex lens 200 can be performed by an adhesive which is not harmful to the transparent human body.

[Formula of lens]

1 / f + 1 / F = 1 / f1

1 / (- f) + 1 / F = 1 / f2

The following formula can be calculated using the polarized flat lens with f = 5 mm, f1 = 4.35 mm, f2 = 5.88 mm, and f = 33.3 mm, which are common focal lengths of the actual multifocal intraocular lens .

1 / 33.3 + 1 / 5.00 = 1 / 4.35

1 / (- 33.3) + 1 / 5.00 = 1 / 5.88

Thus, it can be seen that the multifocal intraocular lens 300 according to various embodiments of the present invention has a focal length of f1 = 4.35 mm and f2 = 5.88 mm.

4A-4D, a cross-sectional view of a multifocal intraocular lens according to various embodiments of the present invention is shown.

As shown in FIG. 4A, the multifocal intraocular lens 300A according to the embodiment of the present invention may include a convex lens 200A that completely covers the flat front and rear surfaces of the polarization-directing flat lens 100 described above . That is, the convex lens 200A includes convex surfaces 201A and 202A formed on both sides with respect to the polarization-directing flat lens 100. [

The convex lens 200A may include, for example, but not limited to, polymethylmethacrylate (PMMA), polycarbonate (PC), cycloolefin copolymer (COC), polyethylene terephthalate (PET), or silicone.

The convex lens 200A may be formed by, for example, but not limited to, a conventional double injection method or an insert injection method. That is, after the polarization-directing flat lens 100 is placed in the upper mold and the lower mold and clamped, the plastic molten resin is injected into the mold at a high temperature and a high pressure so that the convex lens 200A It is possible to obtain an integrated multifocal intraocular lens 300A covering both the front and back surfaces.

As described above, the convex lens 200A is further formed on the front and rear surfaces of the polarization directing flat lens 100, so that the desired dioptric power can be easily realized by the interaction between the polarization directing flat lens 100 and the convex lens 200A The focal intraocular lens 300A is implemented.

As shown in FIG. 4B, the multifocal intraocular lens 300B according to the embodiment of the present invention may include a convex lens 200B attached to the front surface of the polarization-directing flat lens 100. FIG. That is, the convex lens 200B may include a convex convex surface 201B and a plane 202B which is the opposite side thereof, and the plane 202B may be attached to the front surface of the polarization-directing flat lens 100 .

As shown in FIG. 4C, the multifocal intraocular lens 300C according to the embodiment of the present invention may include a convex lens 200C attached to the rear surface of the polarization-directing flat lens 100. FIG. That is, the convex lens 200C may include a flat plane 201C and a convex surface 202C that is opposite thereto, and a plane 201C may be attached to the back surface of the polarization-directing flat lens 100 .

The convex lens 200C may also include, for example, but not limited to, polymethylmethacrylate (PMMA), polycarbonate (PC), cycloolefin copolymer (COC), polyethylene terephthalate (PET), or silicone.

In addition, these convex lenses 200B and 200C may also be formed by, for example, but not limited to, a conventional double injection method or an insert injection method. That is, after the polarization-directing flat lens 100 is positioned and clamped in the upper mold and the lower mold, the plastic molten resin is injected into the mold at a high pressure so that the convex lenses 200B, The integrated multifocal intraocular lenses 300B and 300C covering the front surface or the back surface can be obtained.

By forming the convex lenses 200B and 200C on the front surface or the rear surface of the polarization directing flat lens 100 as described above, the desired dioptric power can be easily obtained by the interaction between the polarization directing flat lens 100 and the convex lenses 200B and 200C Multifocal intraocular lenses 300B and 300C are realized.

4D, the multi-focal intraocular lens 300D according to the embodiment of the present invention may include a meta lens 400 attached to the front surface or the rear surface of the polarization-directing flat lens 100. FIG.

Here, the meta lens 400 may include a plate-shaped substrate and meta surfaces formed on one side of the substrate. The meta surface can be implemented by arranging a plurality of nano fins on one side of the substrate. The nanopin may be, for example, but not limited to, about 100 nm to about 1000 nm in thickness, length, width, and pitch, respectively. These nano-fins have, for example, a uniform pattern at different angles when viewed from a plane, and are arranged at a constant pitch on one surface of the substrate, To be focused. In other words, the meta-surface is a flat / flat lens with no curvature, which allows light to be gathered precisely at a small spot size, especially in all visible light areas.

In other words, the meta surface is formed by arranging the nano-sized nano-fins in a predetermined pattern and pitch on the flat substrate, as described above, instead of making the lens bend. The light incident on the meta surface is directed to a specific point by turning the incident light according to the formation angle of the nano-pin, thereby realizing a convex lens as a flat plane shape without bending. That is, in the present invention, a flat meta lens may be attached to one side of the polarization-directing flat lens instead of a convex convex lens.

Such a meta lens 400 can be obtained by reference to the application number 10-2017-0104723 filed by the present applicant.

Referring to FIGS. 5A and 5B, there is shown a schematic view of the focal lengths of the polarization directing flat lens type multifocal intraocular lens and the meta lens type multifocal intraocular lens according to various embodiments of the present invention.

As shown in Figs. 5A and 5B, a combination of a general convex lens having a convex surface and a polarization directing flat lens, or a combination of a meta lens serving as a convex lens and a polarization directing flat lens all have two focal points, Or a multifocal intraocular lens 300A or 300D having the same refractive index.

6A-6D are plan views of a multifocal intraocular lens according to various embodiments of the present invention.

6A to 6D, the multifocal intraocular lenses 500, 500A, 500B, and 500C according to various embodiments of the present invention may include a substantially planar polarizing directional flat lens 100 and one side, The convex lens 200 or the meta lens 400 formed on both sides and the fixing portions 530, 530A, 530B extending in the outward direction from the periphery of the polarization directing flat lens 100, the convex lens 200 or the meta lens 400 , 530C).

The polarizing directional flat lens 100 and the convex lens 200 or the meta lens 200 are formed in a substantially circular shape to serve as a multifocal intraocular lens and the fixing portions 530, 530A, 530B, To fix the intraocular lens so as not to move to the intraocular lens. That is, the fixing portions 530, 530A, 530B, and 530C are formed in a substantially C shape or J shape to fix the intraocular lens to the inside of the iris.

7A to 7D are schematic views illustrating a cataract surgery method using a multifocal intraocular lens according to various embodiments of the present invention.

7A, the eyeball has a lens 10 in which cataracts are generated, an iris 20 formed in the periphery of the lens 10, and a cornea 30 surrounding the lens 10 and the iris 20 . First, the cornea 30 on the lens 10 and the iris 20 is cut to a predetermined length using a knife 40. In this case, the cornea 30 is cut by about 3 mm or more, but the cornea 30 can be cut within about 2.5 mm.

7B, the ultrasonic emulsifying tool 50 is inserted into the cut portion of the cornea 30, and the cataract portion of the lens 10 is finely divided into micro-units. The cleaved part of the cataract is removed by vacuum suction.

7C, a multifocal intraocular lens 500 including a polarizing directive flat lens and a convex lens or a meta lens according to an embodiment of the present invention is inserted into a cut portion of the cornea 30. At this time, the multifocal intraocular lens 500 can be inserted into the incision portion of the cornea 30 in a folded state, and can be expanded to the original state after insertion. Finally, the fixing portion 530 extending to both sides of the intraocular lens adjusts its position so as to be positioned between the iris 20 and the crystalline lens 10.

7D, the multifocal intraocular lens 500 having the polarization-directing flat lens and the convex lens or the meta lens according to the embodiment of the present invention is placed on the lens 10 from which the cataract is removed, To provide a clear view. At this time, since the incision portion of the cornea 10 is formed within approximately 2.5 mm, it easily heals naturally without the surgical suture line, and astigmatic phenomenon does not appear after the cataract removal surgery.

8 is a schematic view showing a state of vision correction using a multifocal intraocular lens according to various embodiments of the present invention.

8, the multifocal intraocular lens 500 according to the embodiment of the present invention is inserted into the space between the lens 10 and the iris 20, thereby correcting the visual acuity. At this time, as described above, the multifocal intraocular lens 500 according to the present invention is thinly and flexibly formed as a thin film, so that there is almost no friction between the post-surgery multifocal intraocular lens 500 and the conventional lens 10 . Therefore, when the multifocal intraocular lens 500 according to the embodiment of the present invention is used for the correction of eyesight, cataract is hardly formed after the correction of the eyesight.

FIGS. 9A and 9B and FIGS. 10A and 10B are cross-sectional and plan views illustrating a multifocal intraocular lens according to various embodiments of the present invention.

As shown in Figs. 9A and 9B, the diameter of the polarization-directing flat lens 100 of the multifocal intraocular lens is approximately 100% with respect to the diameter of the simple convex lens 200A, The diameter of the polarization directing flat lens 100 may be formed to be approximately 50% with respect to the diameter of the simple convex lens 200A. Practically, the diameter of the polarization-directing flat lens 100 among the multifocal intraocular lenses may be formed to be approximately 30% to 100% of the diameter of the simple convex lens 200A.

If the diameter of the polarizing directional flat lens 100 is less than approximately 30% of the diameter of the simple convex lens 200A, the manufacturing cost is relatively inexpensive, but the function as a concave lens is deteriorated, And if the diameter of the polarization-directing flat lens 100 is larger than approximately 100% of the diameter of the substantially convex lens 200A, the function of the concave lens is strengthened as a whole but the manufacturing cost may increase .

As described above, the present invention is not limited to the above-described embodiments, but rather may be applied to various embodiments of the present invention, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100; Polarization directive flat lens
110; Substrate
111; The first side
112; Second side
121; The linear photo-
125; The optically-oriented liquid crystal polymerized layer
200; convex
300; Intraocular lens
400; Meta lens

Claims (7)

A polarization-directing flat lens collecting a part of light as a convex lens at a focal length + f according to a polarization state of an incident light beam and diffracting a part of light as a concave lens at a focal length-f; And
And a convex lens attached to one surface or the other surface of the polarization-directing flat lens,
Wherein at least two focal lengths f1 and f2 are formed by the combination of the polarization-directing flat lens and the convex lens. The method according to claim 1,
Wherein the polarization-directing flat lens is positioned inside the convex lens. The method according to claim 1,
Wherein the convex lens is formed of PMMA (polymethylmethacrylate), PC (polycarbonate), COC (cycloolefin copolymer), PET (polyethylene terephthalate), or silicone. The method according to claim 1,
The polarization-directing flat lens
Substrate; And
And a photo-aligned liquid crystal polymer layer in the form of a three-dimensional pattern deposited on one side of the substrate to spatially change the geometric phase shift. 5. The method of claim 4,
Wherein the substrate is formed of quartz, glass, polymethylmethacrylate (PMMA), polycarbonate (PC), cycloolefin copolymer (COC), polyethylene terephthalate (PET), or silicone. A polarization-directing flat lens collecting a part of light as a convex lens at a focal length + f according to a polarization state of an incident light beam and diffracting a part of light as a concave lens at a focal length-f; And
And a meta lens attached to one surface or the other surface of the polarization-directing flat lens,
And at least two focal lengths f1 and f2 are formed by the combination of the polarization directing flat lens and the meta lens. The method according to claim 6,
The meta-
Substrate; And
Wherein the substrate comprises metasurfaces formed by arranging a plurality of nano-fins on one surface of the substrate.

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