CN112068228B - Plane focusing lens device based on phonon polarized waves - Google Patents
Plane focusing lens device based on phonon polarized waves Download PDFInfo
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- CN112068228B CN112068228B CN202010766024.3A CN202010766024A CN112068228B CN 112068228 B CN112068228 B CN 112068228B CN 202010766024 A CN202010766024 A CN 202010766024A CN 112068228 B CN112068228 B CN 112068228B
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Abstract
The invention provides a plane focusing lens device based on phonon polarized waves, which comprises a substrate layer, a focusing lens and a focusing lens, wherein a molybdenum oxide thin layer is arranged on the substrate layer; covering a metal antenna on one side of the molybdenum oxide thin layer; and irradiating the metal antenna by using scattered light or infrared light to excite hyperbolic phonon excimer, and adjusting the focal length of nano focusing by changing the size of the metal antenna or the wavelength of incident light. The size of the wave vector of the phonon excimer is regulated and controlled by controlling the size of the metal antenna or the wave number of incident infrared light, so that the focal length regulation and control of the planar lens focusing are realized. The method is simple and easy to implement, and has a wider range and lower cost.
Description
Technical Field
The invention relates to the technical field of nano focusing, in particular to a plane focusing lens device based on phonon polarized waves.
Background
Molybdenum oxide is a biaxial material and has a strong anisotropy. In different residual ray bands, the dielectric functions along different optical axes are opposite, the generated phonon excimer has obvious plane hyperbolic characteristic, and can control light to propagate along a certain special direction, so that the method has important application in the field of control and regulation of light in nano optics.
Hyperbolic phonons are a special class of excimer, which has significant anisotropy and low loss characteristics compared to other conduction types of excimer (e.g., plasmons). In the prior art, the excitation of the in-chip hyperbolic phonon excimer can be realized by depending on a natural molybdenum oxide material.
The planar lens is constructed, and the realization of nano focusing has important application value in the fields of micro-nano optics, light control and adjustment. In the prior art, people mainly rely on a superstructure, and a nano-focusing lens is constructed on the surface of the superstructure. However, the micro-nano processing causes a large loss of light, and the range of light collection is narrow due to the influence of the size. In addition, the lens with the nano focus is constructed on the surface of the super structure, so that the manufacturing cost is high, and the actual production application is not facilitated.
Therefore, in order to solve the above problems, there is a need for a planar focusing lens device based on phonon polarized waves, which can realize the focal length adjustment with reduced loss and simple operation.
Disclosure of Invention
An object of the present invention is to provide a phonon-polarized-wave-based plane focus lens device, which includes a base layer on which a molybdenum oxide thin layer is disposed;
covering a metal antenna on one side of the molybdenum oxide thin layer, irradiating the metal antenna by scattered light or infrared light to excite hyperbolic phonon excimer, and adjusting the focal length of nano focusing by changing the size of the metal antenna or the wavelength of incident light.
Preferably, the base layer material is an inorganic dielectric material or an organic polymer material.
Preferably, the plane geometric dimension of the molybdenum oxide thin layer is 1-500 μm, and the thickness is 2-5000 nm; the geometric dimension of the metal antenna is 10nm-300 mu m, and the thickness of the metal antenna is 20nm-50 mu m.
Another object of the present invention is to provide a method for manufacturing a planar focusing lens device based on phonon polarized waves, the method comprising:
preparing a molybdenum oxide thin layer;
selecting the shape and size of the antenna, and manufacturing a metal antenna;
selecting a substrate layer material, preparing a substrate layer, attaching a molybdenum oxide thin layer on the substrate layer, and covering the metal antenna on one side of the molybdenum oxide thin layer.
Still another object of the present invention is to provide a method for adjusting a focal length of nano-focusing based on a plane focusing lens device of phonon polarized waves, the method comprising:
step 1), directly irradiating a metal antenna by scattered light of a needle point of a mid-infrared scattering type scanning near-field optical microscope to excite a molybdenum oxide phonon excimer;
obtaining electric field distribution and measuring the length of the focal length;
step 2), changing the size of the metal antenna, repeating the step 1) to obtain electric field distribution, and measuring the length of the focal length;
and 3) repeating the step 2) until the focal length is adjusted to a proper position.
Still another object of the present invention is to provide a method for adjusting a focal length of nano-focusing based on a plane focusing lens device of phonon polarized waves, the method comprising:
step a), irradiating the metal antenna by using incident infrared light, and exciting phonon excimer at the boundary of the metal antenna;
obtaining electric field distribution and measuring the length of the focal length;
step b), changing the wave number of incident infrared light, repeating the step a) to obtain electric field distribution, and measuring the length of the focal length;
and c), repeating the step b) until the focal length is adjusted to a proper position.
According to the plane focusing lens device based on the phonon polarized waves and the method for adjusting the focal length of nano focusing, the size of the wave vector of phonon excimer is adjusted and controlled by controlling the size of the metal antenna or the wave number of incident infrared light, so that the focal length is adjusted and controlled.
The invention provides a plane focusing lens device based on phonon polarized waves and a method for adjusting the focal length of nano focusing, which change the size of a metal antenna and can adjust and control the position of a focal point. The planar focusing lens device based on the phonon polarized waves and the method for adjusting the focal length of the nano focusing, provided by the invention, change the wave number of incident infrared light and can also dynamically adjust and control the position of the focal length, thereby realizing the focal length adjustment and control of the planar lens focusing. The method is simple and easy to implement, and has a wider range and lower cost.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
Further objects, features and advantages of the present invention will become apparent from the following description of embodiments of the invention, with reference to the accompanying drawings, in which:
fig. 1 schematically shows a structural diagram of a plane focusing lens device based on phonon polarized waves in the invention.
Fig. 2 shows experimental images and simulated images focused by a plane focusing lens device based on phonon polarized waves in the invention.
Fig. 3 shows optical microscope photographs of different sizes of metal antennas of a planar focusing lens device based on phonon polarized waves of the present invention.
Fig. 4 shows the focused images corresponding to different sizes of metal antennas of a planar focusing lens device based on phonon polarized waves.
Fig. 5 shows a focused image of three groups of metal antenna sizes of the planar focusing lens device based on phonon polarized waves under irradiation of different incident wave numbers.
FIG. 6 is a schematic diagram showing the relationship between different incident wave numbers and focal lengths of a plane focusing lens device based on phonon polarized waves.
Fig. 7 shows a flow chart of a method for adjusting the focal length of nano-focusing based on a plane focusing lens device of phonon polarized waves in one embodiment of the invention.
Detailed Description
The objects and functions of the present invention and methods for accomplishing the same will be apparent by reference to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The nature of the description is merely to assist those skilled in the relevant art in a comprehensive understanding of the specific details of the invention.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, and related technical terms should be well known to those skilled in the art. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps, unless otherwise specified.
The present invention will be explained in detail with reference to specific embodiments, and as shown in fig. 1, a schematic structural diagram of a phonon-polarized-wave-based planar focusing lens device according to the present invention includes a substrate layer 101, and a molybdenum oxide layer 102 disposed on the substrate layer 101. One side of the molybdenum oxide thin layer 102 is covered with a metal antenna 103, scattered light or infrared light irradiates the metal antenna 103 to excite a hyperbolic phonon excimer, and the focal length f of nano focusing is adjusted by changing the size of the metal antenna or the wavelength of incident light.
In some embodiments, the metal antenna 103 is directly illuminated by scattered light from the mid-infrared scattering type scanning near-field optical microscope tip 105, exciting molybdenum oxide phonons.
In other embodiments, the metal antenna 103 is illuminated with incident infrared light 104, exciting phonons at the boundaries of the metal antenna 103.
According to an embodiment of the present invention, the material of the base layer 101 is an inorganic dielectric material or an organic polymer material. For example, in some embodiments, the inorganic dielectric material may be selected from silicon dioxide, silicon, quartz, sapphire, germanium, aluminum oxide, boron nitride, calcium fluoride, magnesium fluoride, gallium arsenide, gallium nitride. In some embodiments, the organic polymer material may be selected from PET, PMMA, PDMS, and plastic.
The crystal plane orientation of the molybdenum oxide is (010), and according to the embodiment of the invention, the plane geometric dimension of the molybdenum oxide thin layer 102 is 1-500 μm, and the thickness is 2-5000 nm. For example, the molybdenum oxide thin layer 102 has a length in the range of 1 μm to 500 μm and a width in the range of 1 μm to 500 μm.
The material of the metal antenna 103 can be selected from iron, aluminum, copper, gold, silver, platinum and steel. The shape of the metal antenna 103 can be circular, semicircular, elliptical or semi-elliptical, the geometric dimension of the metal antenna 103 is 10nm-300 μm, and the thickness is 20nm-50 μm.
In the embodiment, a circular metal antenna (disk) is taken as an example, the diameter of the metal antenna is 10nm-300 μm, and the thickness of the metal antenna is 20nm-50 μm.
The focusing of the planar lens is realized by exciting hyperbolic phonon excimer in molybdenum oxide and relying on the metal antenna, and the focal length is dynamically regulated and controlled by changing the size of the metal antenna or the wave number of incident light. The incident electromagnetic wave used for exciting the molybdenum oxide is concentrated in the infrared region, and the main wave number of the region is 400-980cm-1。
According to an embodiment of the present invention, a method for manufacturing a planar focusing lens device based on phonon polarized waves includes:
preparing a molybdenum oxide thin layer;
selecting the shape and size of the antenna, and manufacturing a metal antenna;
selecting a substrate layer material, preparing a substrate layer, attaching a molybdenum oxide thin layer on the substrate layer, and covering the metal antenna on one side of the molybdenum oxide thin layer.
The focusing of the plane focusing lens device based on the phonon polarized wave provided by the invention is analyzed through specific experiments and simulations.
Fig. 2 shows experimental images and simulated images focused by the plane focusing lens device based on phonon polarized waves.
The planar lens focusing device provided by the invention performs planar focusing by exciting phonons of molybdenum oxide through the metal antenna, wherein in the figure 2, (a) is the incident wave number of 900cm-1Next, an experimental image of a metal antenna (disk) having a diameter of 2.4um, and f is a focal length of the image display. (b) At an incident wave number of 900cm-1Lower, experimental image of metal antenna (half disc) with diameter of 2.4um, f isFocal length of image display.
In the examples, simulation was carried out using COMSOL software, and in FIG. 2, (c) is a value of 900cm at an incident wave number-1Next, an analog image of a metal antenna (disk) having a diameter of 2.4um, and f is a focal length of the image display. (d) At an incident wave number of 900cm-1And the diameter of the lower part is a simulated image of the metal antenna (semi-circular disc) with the diameter of 2.4um, and f is the focal length of image display.
Optical microscope photographs of different sizes of metal antennas of a planar focusing lens device based on phonon polarized waves of the present invention are shown in fig. 3. In the examples, a metal antenna having a diameter of 0.5 μm to 22 μm was photographed by a fiber microscope, and a circular white area on the right side in fig. 3 is the metal antenna, and the diameter size of the metal antenna is on the left side.
Fig. 4 shows a focused image corresponding to different sizes of metal antennas of a planar focusing lens device based on phonon polarized waves. In the embodiment, under the irradiation of infrared light, phonon excimer focusing is performed under different sizes of metal antennas. In fig. 4, the left side shows the relationship between the size of the metal antenna and the focusing size, and the right side corresponds to the planar lens focusing image of different metal antennas.
According to fig. 4, by gradually reducing the diameter of the metal antenna, the focal distance of the focus gradually decreases, the focal point being closer to the metal antenna boundary. Therefore, the plane focusing lens device based on the phonon polarized waves can adjust the focal length by adjusting the diameter of the disc, and the effect is very obvious.
Fig. 5 shows a focused image of three groups of metal antenna sizes of the planar focusing lens device based on phonon polarized waves under irradiation of different incident wave numbers. In the examples, three sets of planar lenses of different incident wave numbers at different metal antenna diameters are given as focused images. It is clearly seen that the focal length becomes progressively smaller as the wave number increases.
FIG. 6 is a schematic diagram showing the relationship between different incident wave numbers and focal lengths of a plane focusing lens device based on phonon polarized waves. Gold is used as a metal antenna, the diameters of the metal antenna are respectively three groups of sizes of 100nm, 255nm and 450nm, and the focal length gradually becomes smaller along with the increase of the wave number of incident light.
According to the plane focusing lens device based on the phonon polarized wave, provided by the invention, the plane lens focusing is realized by exciting hyperbolic phonon excimer in molybdenum oxide and relying on the metal antenna, and the focal length is dynamically regulated and controlled by changing the size of the metal antenna or the wave number of incident light.
According to an embodiment of the present invention, a method of adjusting a focal length of a nano-focus by changing a size of a metal antenna, in particular, a method of adjusting a focal length of a nano-focus using a planar lens focusing device, includes:
And 2, selecting the shape and the size of the antenna to manufacture the metal antenna.
And 3, selecting a material of the substrate layer, preparing the substrate layer, attaching a molybdenum oxide thin layer to the substrate layer, and covering the metal antenna (metal disc) on one side of the molybdenum oxide thin layer.
And 4, directly irradiating the metal antenna by scattered light of the needle point of the intermediate infrared scattering type scanning near-field optical microscope to excite the phonon excimer of the molybdenum oxide.
And 5, obtaining electric field distribution and measuring the length of the focal length.
And 6, changing the size of the metal antenna, repeating the step 4 to obtain the electric field distribution, and measuring the length of the focal length.
And 7, repeating the step 6 until the focal length is adjusted to a proper position.
In some preferred embodiments, the size (disc diameter) of the prepared metal antenna is continuously changed so as to continuously adjust the focal distance.
Fig. 7 shows a flow chart of a method for adjusting the focal length of nano-focusing based on a plane focusing lens device of phonon polarized waves in one embodiment of the invention. According to an embodiment of the present invention, a method of adjusting a focal length of a nano focus by changing an incident light wave number of infrared light, in particular, a method of adjusting a focal length of a nano focus using a planar lens focusing device, includes:
and S101, preparing a molybdenum oxide thin layer.
And S102, selecting the shape and the size of the antenna, and manufacturing the metal antenna.
Step S103, selecting a substrate layer material, preparing a substrate layer, attaching a molybdenum oxide thin layer on the substrate layer, and covering the metal antenna (metal disc) on one side of the molybdenum oxide thin layer.
And step S104, irradiating the metal antenna by using incident infrared light, and exciting phonon excimer at the boundary of the metal antenna.
And step S105, obtaining electric field distribution and measuring the length of the focal length.
According to the embodiment of the invention, after obtaining the length of the measurement focal length, the method further comprises the following steps:
and S106, changing the wave number of the incident infrared light, repeating the step S104 to obtain the electric field distribution, and measuring the length of the focal length.
And S107, repeating the step S106 until the focal length is adjusted to a proper position.
According to the plane focusing lens device based on the phonon polarized waves and the method for adjusting the focal length of nano focusing, the size of the wave vector of phonon excimer is adjusted and controlled by controlling the size of the metal antenna or the wave number of incident infrared light, so that the focal length is adjusted and controlled.
The invention provides a plane focusing lens device based on phonon polarized waves and a method for adjusting the focal length of nano focusing, which change the size of a metal antenna and can adjust and control the position of a focal point. The planar focusing lens device based on the phonon polarized waves and the method for adjusting the focal length of the nano focusing, provided by the invention, change the wave number of incident infrared light and can also dynamically adjust and control the position of the focal length, thereby realizing the focal length adjustment and control of the planar lens focusing. The method is simple and easy to implement, and has a wider range and lower cost.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (4)
1. A plane focusing lens device based on phonon polarized waves is characterized by comprising a substrate layer, a focusing lens and a focusing lens, wherein the substrate layer is made of an inorganic dielectric material or an organic polymer material, and a molybdenum oxide thin layer is arranged on the substrate layer;
covering a metal antenna on one side of the molybdenum oxide thin layer; irradiating the metal antenna by scattered light or infrared light to excite hyperbolic phonon excimer, and adjusting the focal length of nano focusing by changing the size of the metal antenna or the wavelength of incident light;
the plane geometric dimension of the molybdenum oxide thin layer is 1-500 mu m, and the thickness is 2-5000 nm; the geometric dimension of the metal antenna is 10nm-300 mu m, and the thickness of the metal antenna is 20nm-50 mu m.
2. A method of making the device of claim 1, the method comprising:
preparing a molybdenum oxide thin layer;
selecting the shape and size of the antenna, and manufacturing a metal antenna;
selecting a substrate layer material, preparing a substrate layer, attaching a molybdenum oxide thin layer on the substrate layer, and covering the metal antenna on one side of the molybdenum oxide thin layer.
3. A method for adjusting the focal length of a nano-focus using the device of claim 1, the method comprising:
step 1), directly irradiating a metal antenna by scattered light of a needle point of a mid-infrared scattering type scanning near-field optical microscope to excite a molybdenum oxide phonon excimer;
obtaining electric field distribution and measuring the length of the focal length;
step 2), changing the size of the metal antenna, repeating the step 1) to obtain electric field distribution, and measuring the length of the focal length;
and 3) repeating the step 2) until the focal length is adjusted to a proper position.
4. A method for adjusting the focal length of a nano-focus using the device of claim 1, the method comprising:
step a), irradiating the metal antenna by using incident infrared light, and exciting phonon excimer at the boundary of the metal antenna;
obtaining electric field distribution and measuring the length of the focal length;
step b), changing the wave number of incident infrared light, repeating the step a) to obtain electric field distribution, and measuring the length of the focal length;
and c), repeating the step b) until the focal length is adjusted to a proper position.
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| CN110133759A (en) * | 2019-04-23 | 2019-08-16 | 电子科技大学 | One kind being based on VO2Dynamic Terahertz super lens |
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| CN106207481A (en) * | 2016-09-14 | 2016-12-07 | 重庆大学 | A kind of reflective super diffracted ray focus device based on metal bar shaped aerial array |
| CN106338795A (en) * | 2016-10-25 | 2017-01-18 | 中国科学院光电技术研究所 | Bessel nano-focusing device |
| CN109270606A (en) * | 2018-10-08 | 2019-01-25 | 桂林电子科技大学 | A method of dynamic multifocal super lens are constructed based on medium and graphene |
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