CN113311516B - Hyperbolic lens with large radius arc inner surface - Google Patents
Hyperbolic lens with large radius arc inner surface Download PDFInfo
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- CN113311516B CN113311516B CN202010122636.9A CN202010122636A CN113311516B CN 113311516 B CN113311516 B CN 113311516B CN 202010122636 A CN202010122636 A CN 202010122636A CN 113311516 B CN113311516 B CN 113311516B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/58—Optics for apodization or superresolution; Optical synthetic aperture systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/06—Simple or compound lenses with non-spherical faces with cylindrical or toric faces
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Abstract
The invention relates to the technical field of optics, in particular to a hyperbolic lens with a large-radius radian inner surface, which is designed aiming at the increasing requirement of optical super-resolution imaging, adopts a double-layer lens structure, can realize the amplification and imaging of a sub-wavelength object, has the imaging resolution ratio lower than the optical diffraction limit, has the super-resolution imaging capability, is not limited to a pattern formed by one-dimensional and two-dimensional slits on a non-transparent thin layer, and simultaneously allows the sub-wavelength object to be directly imaged; the invention comprises two parts, including an outer lens and an inner lens, the inner lens and the outer lens are made of the same material and are formed by alternately stacking silver films/aluminum oxide films, but the shapes of the inner lens and the outer lens are different, the outer surface of the inner lens is attached to the inner surface of the outer lens, the inner surface of the inner lens is the inner surface of the final hyperbolic lens and is a receiving surface, and the outer surface of the outer lens is the outer surface of the final hyperbolic lens.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a hyperbolic lens with a large-radius radian inner surface.
Background
As is well known, the existence of the optical diffraction limit increases the resistance of people to research structures or objects with sub-wavelength or less, and therefore, the research of the super-resolution imaging technology is required; at present, the research on the super-resolution imaging technology is not mature, so that the super-resolution imaging technology has great progress space; the hyperbolic lens is a branch of a super-lens technology and aims at carrying out non-fluorescence super-resolution imaging, and the original design aim is to carry out super-resolution imaging on a sub-wavelength object; the hyperbolic lens provided by the invention can realize object microstructure imaging, and the imaging resolution is far higher than the half-wavelength resolution achieved by the conventional optical imaging technology.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the hyperbolic lens which has super-resolution imaging capability, can realize the amplification and imaging of the information of the sub-wavelength tiny object, is not limited to the pattern formed by the one-dimensional slit and the two-dimensional slit on the non-transparent thin layer, and allows the sub-wavelength object to be directly imaged and has the inner surface with large radius radian.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the hyperbolic lens with the large-radius radian inner surface comprises an outer lens and an inner lens, wherein the inner lens is provided with a hemispherical outline and an arc lower surface, the radius of the radian of the lower surface is 260nm, the radius of the radian of the outer surface is 340nm, the inner lens is made of hyperbolic materials formed by alternately stacking silver films/aluminum oxide films, the thickness of the aluminum oxide film of the inner lens is 10nm, the thickness of the silver film of the inner lens is totally four layers, the thickness of the silver film of the inner lens is 10nm, the thickness of the silver film is totally four layers, the thickness of the silver film is consistent with that of the aluminum oxide film, the outer lens is made of the hyperbolic materials to form a semicircular column shape, the radiuses of the radian of the inner surface and the outer surface are respectively 100nm and 250nm, the outer lens is made of a hyperbolic material formed by alternately stacking silver films/aluminum oxide films, the thickness of the silver film of the outer lens is 10nm, the outer lens is eight layers in total, the thickness of the aluminum oxide film of the outer lens is 10nm, the thicknesses of the silver film and the aluminum oxide film are seven layers in total, the thickness of each silver film/aluminum oxide film in the inner lens is consistent with that of each silver film/aluminum oxide film in the outer lens, the outer surface of the inner lens is attached to the inner surface of the outer lens, the inner surface of the inner lens is the inner surface of the final hyperbolic lens and is a receiving surface, and the outer surface of the outer lens is the outer surface of the final hyperbolic lens and is an imaging surface.
Preferably, the inner lens is cut from a complete semicircular cylindrical hyperbolic material.
Preferably, the inner lens inner surface radius is substantially larger than the inner surface radius of the outer lens.
Preferably, the final hyperbolic lens is a semi-cylindrical/hemispherical structure.
(III) advantageous effects
Compared with the prior art, the invention provides the hyperbolic lens with the large-radius radian inner surface, which has the following beneficial effects:
1. the hyperbolic lens with the large-radius radian inner surface is regarded as a material with anisotropic dielectric constant through the selected alternative stacking structure of silver films/aluminum oxide films with sub-wavelength thickness, and the material can couple sub-wavelength information carried by evanescent waves transmitted into the hyperbolic lens into non-evanescent waves, so that the hyperbolic lens can be clearly imaged on the other side through conventional optical imaging equipment;
2. the hyperbolic lens with the large-radius radian inner surface has the advantages that the requirement of the hyperbolic lens on an imaged object is reduced to the greatest extent by selecting the arc inner surface, meanwhile, the final hyperbolic lens is of a semi-cylindrical/hemispherical structure, so that the lens can amplify received sub-wavelength object information and enable the information to be collected through conventional imaging equipment, and the final hyperbolic lens is provided with the large-radius radian inner surface, so that the final hyperbolic lens is only required to be directly placed on a free sub-wavelength object on a smooth surface, and the image of the amplified object can be directly obtained on the hyperbolic lens by using conventional optical imaging equipment, compared with other super-resolution imaging technologies, the hyperbolic lens with the large-radius radian inner surface has the advantages of simple optical path structure, capability of realizing real-time imaging and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure between the inner lens and the semicircular cylindrical hyperbolic material;
FIG. 3 is a schematic structural diagram of an inner lens;
FIG. 4 is a schematic diagram of the outer lens;
FIG. 5 is a schematic of the present invention imaging a free sample;
FIG. 6 is a schematic representation of the imaging effect of the present invention on a free sample;
fig. 7 is a graph of the effect of the present invention on imaging a free sample.
In the figure: 1. An inner lens; 2. a semicircular cylindrical hyperbolic material; 3. an inner lens alumina film; 4. an inner lens silver thin film; 5. an outer lens silver film; 6. an outer lens alumina film; 7. the interface of the inner and outer lenses; 8. an imaging plane; 9. an outer lens; 11. a receiving surface; 12. a rectangular free sample; 13. sample silver film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 7, a hyperbolic lens having an inner surface with a large radius of curvature includes an outer lens 9 and an inner lens 1, the inner lens 1 has a hemispherical profile and an arc-shaped lower surface, the radius of the arc of the lower surface is 260nm, the radius of the arc of the outer surface is 340nm, the inner lens 1 is made of a hyperbolic material formed by alternately stacking silver films/aluminum oxide films, the thickness of the aluminum oxide film 3 of the inner lens is 10nm, four layers in total, the thickness of the silver film 4 of the inner lens is 10nm, four layers in total, and the alternate stacking structure of the silver films/aluminum oxide films with a sub-wavelength thickness is selected as a material having an anisotropic dielectric constant, which can couple sub-evanescent wavelength information carried by an evanescent wave transmitted thereto into a non-evanescent wave, thereby enabling a clear image formation on the other surface by a conventional optical imaging device, the inner lens 1 is composed of four silver film/aluminum oxide film combinations, the thickness of the silver film is consistent with that of the aluminum oxide film, the outer lens 9 is in a semicircular column shape formed by hyperbolic materials, the radiuses of the radian of the inner surface and the radian of the outer surface are respectively 100nm and 250nm, the outer lens 9 is formed by hyperbolic materials formed by alternately stacking the silver films/the aluminum oxide films, the thickness of the silver film 5 of the outer lens is 10nm, eight layers are provided, the thickness of the aluminum oxide film 6 of the outer lens is 10nm, seven layers are provided, the thicknesses of the silver films and the aluminum oxide films are consistent, the thickness of each silver film/aluminum oxide film in the inner lens 1 is consistent with that of each silver film/aluminum oxide film in the outer lens 9, the outer surface of the inner lens 1 is attached to the inner surface of the outer lens 9, the inner surface of the inner lens 1 is the final hyperbolic lens inner surface, the receiving surface 11 is the outer surface of the final hyperbolic lens 9, an arc-shaped inner surface is selected for an imaging surface 8, the requirement of the hyperbolic lens on an imaging object is reduced to the maximum extent, meanwhile, because the final hyperbolic lens is in a semi-cylindrical/hemispherical structure, the lens can amplify received sub-wavelength object information and enable the information to be collected by conventional imaging equipment, and because the final hyperbolic lens has a large-radius inner arc-degree inner surface, the final hyperbolic lens only needs to be directly placed on a free sub-wavelength object on a smooth surface, an image of the amplified object can be directly obtained on the hyperbolic lens by using conventional optical imaging equipment, the inner lens 1 is intercepted by a complete semi-circular cylindrical hyperbolic material 2, and the requirement of the hyperbolic lens on the imaging object can be reduced to the maximum extent; the radius of the inner surface of the inner lens 1 is far larger than that of the inner surface of the outer lens 9, evanescent waves on the surface of an object need to be collected by the hyperbolic lens, and the distance between the imaged object and the receiving surface 11 can be shortened by increasing the radius of the inner surface of the lens; the final hyperbolic lens is of a semi-cylindrical/hemispherical structure, and the lens can amplify received sub-wavelength object information and enable the information to be collected through conventional imaging equipment.
The size of the lens needs to be designed according to the actual situation, the radius of the outer surface of the outer lens is 200nm-400nm, and the radius of the inner surface of the outer lens is 100nm-200nm; the radian radius of the inner surface of the inner lens is required to be designed according to the size of an observed object, and specifically the radian radius of the inner surface is 260nm-520nm, and the radian radius of the outer surface is 340nm-680nm; the thickness of the silver film and the thickness of the aluminum oxide film need to be designed according to requirements, and are particularly between 10 and 30 nm.
The hyperbolic lens with the large-radius radian inner surface is characterized in that the lens is firstly arranged on a silver film, a rectangular free sample 12 with the section of 10nm in height and 20nm in width is arranged on a sample silver film 13, then a light source irradiates the silver film 13 to generate surface plasmon, simultaneously propagation waves generated on the surface of the sample and evanescent waves carrying sub-wavelength information are received by the inner surface of the lens, information carried by the evanescent waves is coupled into the propagation waves by a hyperbolic material of the lens, meanwhile, the propagation waves coupled with the sub-wavelength information in the evanescent waves are amplified in the process of propagation in the lens and finally propagate to an imaging surface 8, the propagation waves coupled with the sub-wavelength information and amplified are generated from propagation in the imaging surface 8, and at the moment, traditional optical imaging equipment is arranged above the imaging surface 8 to realize sub-wavelength imaging.
Meanwhile, the radius of the semicircular cylindrical hyperbolic material 2 can be changed aiming at samples with different sizes so as to adjust the inner surface of the inner lens 1.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A hyperbolic lens having a large radius curved inner surface, characterized in that: comprises an outer lens (9) and an inner lens (1), the inner lens (1) has a hemispherical contour and an arc inner surface, the radius of the radian of the inner surface is 260nm, the radius of the radian of the outer surface is 340nm, the inner lens (1) is made of a hyperbolic material formed by alternately stacking silver thin films/aluminum oxide thin films, the thickness of the inner lens aluminum oxide film (3) is 10nm, the total thickness is four layers, the thickness of the inner lens silver film (4) is 10nm, the total thickness is four layers, the inner lens (1) has four silver film/alumina film combinations, the thickness of the silver film is consistent with that of the aluminum oxide film, the outer lens (9) is in a semi-circular column shape formed by hyperbolic materials, the radiuses of the radians of the inner surface and the outer surface are respectively 100nm and 250nm, the outer lens (9) is made of hyperbolic materials formed by alternately stacking silver films/aluminum oxide films, the thickness of the outer lens silver film (5) is 10nm, eight layers are totally, the thickness of the outer lens alumina film (6) is 10nm, seven layers are totally, the thickness of the silver film is consistent with that of the aluminum oxide film, the thickness of each layer of the silver film/aluminum oxide film in the inner lens (1) is consistent with that of each layer of the silver film/aluminum oxide film in the outer lens (9), the outer surface of the inner lens (1) is attached to the inner surface of the outer lens (9), the inner surface of the inner lens (1) is the inner surface of the final hyperbolic lens and is a receiving surface (11), and the outer surface of the outer lens (9) is the outer surface of the final hyperbolic lens and is an imaging surface (8).
2. A hyperbolic lens having a large-radius curved inner surface according to claim 1, characterised in that: the inner lens (1) is intercepted from a complete semicircular cylindrical hyperbolic material (2).
3. A hyperbolic lens having a large-radius curved inner surface according to claim 2, characterised in that: the radius of the inner surface of the inner lens (1) is larger than that of the outer lens (9).
4. A hyperbolic lens having a large-radius curved inner surface according to claim 3, characterized in that: the final hyperbolic lens is of a semi-cylindrical/hemispherical structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010122636.9A CN113311516B (en) | 2020-02-27 | 2020-02-27 | Hyperbolic lens with large radius arc inner surface |
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| CN202010122636.9A CN113311516B (en) | 2020-02-27 | 2020-02-27 | Hyperbolic lens with large radius arc inner surface |
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| CN113311516A CN113311516A (en) | 2021-08-27 |
| CN113311516B true CN113311516B (en) | 2022-10-04 |
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| CN110174719A (en) * | 2019-05-06 | 2019-08-27 | 南京邮电大学 | Column vector beam sub-wavelength condenser lens based on hyperbolic Meta Materials |
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| TW201350919A (en) * | 2012-06-11 | 2013-12-16 | Univ Nat Taiwan | Assembly of lensesfor resolution |
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