A non-local planar optical wavefront shaping device, method and system

Abstract

The present invention relates to the field of optical material technology, and discloses a non-local planar optical wavefront shaping device, method, and system. The method comprises: determining a near-zero refractive index material within the pump light band according to a pump light band; adjusting the thickness of the near-zero refractive index material according to the phase thickness of the near-zero refractive index material in an ambient environment so that the optical impedance of the near-zero refractive index material in the ambient environment matches the optical impedance of the ambient medium, obtaining a transverse magnetic polarization transfer function and a transverse electric polarization transfer function for the reflectivity coefficient of the near-zero refractive index material in transverse magnetic polarization and transverse electric polarization modes, respectively; and fitting the transverse magnetic polarization transfer function and the transverse electric polarization transfer function to obtain a transfer function of the near-zero refractive index material. The present invention shapes the pump beam by designing a non-local plane, converting a fundamental mode Gaussian beam into a higher-order mode, thereby achieving gain medium inversion, ion beam multiplication, and controlling the bending of the gain medium due to the photothermal effect.

Description

Technical Field

[0001] The present invention relates to the technical field of optical materials, and in particular to a non-local planar optical wavefront shaping device, method and system. Background Art

[0002] The pumping system of a solid-state laser excites the gain medium in the form of light. By shaping or controlling the light beam, the degree of interaction between the pump beam and the gain medium can be achieved, thereby affecting the inversion population of the gain medium and the thermal mirror effect of the gain medium.

[0003] Pump light shaping techniques are categorized into localized planar optics and non-localized planar optics. Localized planar optics primarily utilizes diffractive optical elements, spatial light modulators (LCMs), lens-fiber coupling, microlens arrays, and aspheric mirrors (free-form mirrors). These techniques control wave transmission and reflection locally and point-by-point based on engineered lateral inhomogeneities. This means that the output of a single optical element at a specific location on its output plane depends solely on the input at that specific point. This prevents single localized devices from achieving a wide range of functions beyond position-dependent wavefront transformation. For example, a single refractive optical element cannot independently transform Hermite-Gaussian modes of varying orders, such as converting the fundamental transverse mode to higher-order modes. Non-localized planar optics can overcome some of the limitations of both conventional and localized planar optics. Effective devices with non-local input-output responses (such as thin films or metasurfaces) can be transformed from real space into momentum / wavevector space, or spatial Fourier space, corresponding to the plane wave expansion of the field.

[0004] Therefore, the nonlocal plane can be used to achieve arbitrary control of the pump beam from the fundamental mode Gaussian beam to the higher-order mode. Summary of the Invention

[0005] The purpose of the present invention is to provide a non-local planar optical wavefront shaping device, method, and system that can solve at least one of the above-mentioned technical problems. The specific solution is as follows:

[0006] According to a specific embodiment disclosed in the present invention, a first aspect of the present invention discloses a non-local planar optical wavefront shaping method, comprising: using a near-zero refractive index material, including:

[0007] Determining, according to a pump light wavelength band, a material having a near-zero refractive index in the pump light wavelength band;

[0008] According to the phase thickness of the near-zero refractive index material in the environment, the thickness of the near-zero refractive index material is adjusted so that the optical impedance of the near-zero refractive index material in the environment matches the optical impedance of the environment medium, and a transverse magnetic polarization transfer function and a transverse electric polarization transfer function of the reflectivity coefficient of the near-zero refractive index material in transverse magnetic polarization and transverse electric polarization modes are obtained respectively;

[0009] The expression of the phase thickness is:

[0010]

[0011] in, d represents the thickness of the near-zero refractive index material, represents the wave vector constant;

[0012] n 1 represents the refractive index of the environment, n 2 represents the refractive index of the near-zero refractive index material;

[0013] represents the incident angle onto the surface of the near-zero refractive index material;

[0014] Fitting the transverse magnetic polarization transfer function and the transverse electric polarization transfer function to obtain the transfer function of the near-zero refractive index material , the transfer function of the near-zero refractive index material Relationship curve with transverse wave vector Satisfies the relationship:

[0015] (1);

[0016] in, is the dimensionless fitting coefficient,

[0017] express x Direction or y The transverse wave vector in the direction of n are the transfer function fitting coefficients.

[0018] Preferably, matching the optical impedance of the near-zero refractive index material in the environment with the optical impedance of the environment medium comprises:

[0019] According to the refractive index of the ambient medium, the reflection coefficient of the near-zero refractive index material is changed by adjusting the phase thickness so that the reflection coefficient of the near-zero refractive index material approaches 0 or reaches a predetermined minimum value;

[0020] The expression of the reflection coefficient of the near-zero refractive index material is:

[0021] (2);

[0022] in, is the Fresnel reflection coefficient from the ambient medium to the material with near-zero refractive index;

[0023] is the phase thickness of the near-zero refractive index material.

[0024] Preferably, the near-zero refractive index material is a near-zero dielectric constant material.

[0025] Preferably, the pump light wavelength band is a near-infrared wavelength band, and the near-zero refractive index material is: indium tin oxide, aluminum-doped zinc oxide or doped cadmium oxide.

[0026] Preferably, the pump light wavelength band is a partial ultraviolet wavelength band, and the near-zero refractive index material is: copper, silver or aluminum nanoparticles.

[0027] Preferably, when the wavelength of the pump light is 969 nm, the near-zero refractive index material is indium tin oxide, and the thickness of the near-zero refractive index material is d =100nm, refractive index n =0.1+1 i :

[0028] The transfer function of the near-zero refractive index material .

[0029] Preferably, when the spot pattern of the pump light is When the light spot pattern after being shaped by the near-zero refractive index material is .

[0030] Preferably, when the spot pattern of the pump light is a fundamental mode Gaussian beam TEM (0,0), the spot pattern after being shaped by the near-zero refractive index material is .

[0031] According to a specific embodiment disclosed in the present invention, a second aspect of the present invention discloses a non-local planar optical wavefront shaping device obtained by the above method.

[0032] According to a specific embodiment disclosed in the present invention, a third aspect of the present invention discloses a non-local planar optical wavefront shaping system, comprising the above-mentioned non-local planar optical wavefront shaping device.

[0033] Compared with the prior art, the above solution disclosed in the present invention has at least the following beneficial effects:

[0034] The present invention shapes the pump beam by designing a non-local plane, converting the fundamental mode Gaussian beam into a high-order mode, thereby achieving gain medium inversion, ion beam increase, and controlling the bending of the gain medium due to the photo-thermal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present disclosure and, together with the specification, explaining the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0036] Figure 1 is a flow chart of a non-local optical wavefront shaping method according to a first embodiment of the present invention;

[0037] Figure 2 This is an electric field distribution diagram of a wavefront shaping process implemented in one embodiment of the present invention;

[0038] Figure 3 is a graph of the transverse electric polarization transfer function according to an embodiment of the present invention;

[0039] Figure 4 is a transverse magnetic polarization transfer function curve diagram of an embodiment of the present invention;

[0040] Figure 5 This is a comparison diagram of the wavefront shaping effect of a non-local planar optical system according to an embodiment of the present invention;

[0041] Figure 6 1 is a schematic structural diagram of a non-local optical wavefront shaping system according to a first embodiment of the present invention;

[0042] Figure 7 It is a structural diagram of an electronic device provided by an embodiment of the present invention.

[0043] Reference numerals:

[0044] 1- non-local planar optical wavefront shaping device; 2- pump light source; 3- beam splitter; 4- focusing lens;

[0045] 5- Photodetector. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages disclosed in the present invention more clearly apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some of the embodiments disclosed in the present invention, rather than all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments disclosed in the present invention without inventive effort shall fall within the scope of protection disclosed in the present invention.

[0047] The terms used in the embodiments disclosed herein are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. The singular forms "a," "an," "the," and "the" used in the embodiments disclosed herein and the appended claims are also intended to include the plural forms, and "a plurality" generally includes at least two, unless the context clearly indicates otherwise.

[0048] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0049] It should be understood that although the terms first, second, third, etc. may be used to describe the embodiments of the present invention, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, the first can also be referred to as the second, and similarly, the second can also be referred to as the first without departing from the scope of the embodiments of the present invention.

[0050] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0051] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or device comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or device. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or device comprising the element.

[0052] The optional embodiments disclosed in the present invention are described in detail below with reference to the accompanying drawings.

[0053] When the wavelength is The beam has a Gaussian electric field When the distribution is incident on the surface of the optical element, the outgoing electric field With the incident electric field Existence relationship: .

[0054] in, x ,y is the spatial position of the light beam; The transverse wave vectors are x and y Directional component.

[0055] , and are the incident angle and arc angle along the transmission direction z of the incident light beam, is the wave vector constant, .

[0056] Therefore, the present invention utilizes the non-local effect of the near-zero refractive index material and designs the transfer function of the near-zero refractive index material. The wavefront of the light beam can be controlled so that it presents a high-order Gaussian electric field distribution according to the needs, thereby achieving efficient wavefront light control. Example 1

[0057] A first embodiment of the present invention provides a non-local planar optical wavefront shaping method using a near-zero refractive index material, comprising the following steps:

[0058] Step S102 : determining a material having a near-zero refractive index in the pump light band according to the pump light band.

[0059] Specifically, a near-zero refractive index material refers to a material whose real part of the refractive index is close to zero at a specific wavelength.

[0060] In a preferred embodiment of the present invention, transparent conductive oxides with a real part of a dielectric constant close to zero can be used in the near-infrared band, such as indium tin oxide (ITO), aluminum-doped zinc oxide (AZO), or doped cadmium oxide (CdO).

[0061] In other embodiments, copper, silver, or aluminum nanoparticles with metal nanostructures can be used in the ultraviolet band. When near the plasma frequency, the real part of the dielectric constant can approach zero, and can exhibit properties similar to near-zero refractive index materials, equivalent to near-zero refractive index materials.

[0062] In other embodiments, a metasurface material having a metal-dielectric multilayer film may also be selected.

[0063] Step S104: Adjust the thickness of the near-zero refractive index material according to the phase thickness of the near-zero refractive index material in the environmental wrapping, so that the optical impedance of the near-zero refractive index material in the environmental wrapping matches the optical impedance of the environmental medium, and obtain the transverse magnetic polarization transfer function and the transverse electric polarization transfer function of the reflectivity coefficient of the near-zero refractive index material in the transverse magnetic polarization mode and the transverse electric polarization mode, respectively.

[0064] Specifically, the expression for the phase thickness of a near-zero refractive index material is:

[0065]

[0066] in, d represents the thickness of the near-zero refractive index material, represents the wave vector constant;

[0067] n 1 represents the refractive index of the environment, n 2 represents the refractive index of the near-zero refractive index material;

[0068] represents the incident angle onto the surface of the near-zero refractive index material.

[0069] Optical impedance is directly related to a material's dielectric constant and magnetic permeability. Different materials have different dielectric constants and magnetic permeabilities, and therefore different optical impedances. When a light wave passes from one medium into another, the difference in optical impedance causes some light to be reflected and some to be transmitted. If the optical impedances of the two media are well matched, the light reflection efficiency decreases.

[0070] When a near-zero refractive index material with a reflective refractive index of n2 is surrounded by an ambient medium with a refractive index of n1, according to the multi-beam coherence decomposition principle, the reflection coefficient r of the near-zero refractive index material is:

[0071] (2);

[0072] in, is the Fresnel reflection coefficient from the ambient medium to the material with near-zero refractive index;

[0073] is the phase thickness of the near-zero refractive index material.

[0074] Therefore, at the pump wavelength and the angle of incidence By adjusting the thickness of the near-zero refractive index material d , which can make the overall optical impedance of the near-zero refractive index material-environmental medium have different matching effects with the optical impedance of the environmental medium.

[0075] That is, by adjusting the longitudinal phase thickness of the near-zero refractive index material Compensate for the impedance matching of the electric field components in the transverse magnetic polarization and transverse electric polarization directions on the interface, so that the refractive index of the material with near-zero refractive index can be reduced under normal incidence ( is 0), the reflection coefficient approaches zero or reaches a predetermined minimum value. As the impedance increases, the impedance gradually mismatches and the reflection coefficient gradually increases.

[0076] In other embodiments, the real part of the near-zero refractive index material can be controlled to be zero or approach zero by selecting different methods for manufacturing the near-zero refractive index material.

[0077] In nonlocal plane optics, the components of the transverse wave vector are used to achieve nonlocal manipulation of light waves. Therefore, by adjusting the thickness of the near-zero refractive index material to meet certain optical impedance matching conditions, simulations of the near-zero refractive index material can yield reflection transfer functions for different polarization states at the pump light wavelength.

[0078] Step S106: Fit the transverse magnetic polarization transfer function and the transverse electric polarization transfer function to obtain the transfer function of the near-zero refractive index material. .

[0079] Specifically, the transverse magnetic polarization transfer function and the transverse electric polarization transfer function obtained in step S104 are fitted to obtain the transfer function of the near-zero refractive index material , the transfer function of the near-zero refractive index material Relationship curve with transverse wave vector Satisfies the relationship:

[0080] (1);

[0081] in, is the dimensionless fitting coefficient,

[0082] express x Direction or y The transverse wave vector in the direction of n are the transfer function fitting coefficients.

[0083] Specifically, the transfer function fitting coefficients n It represents the order of the pump light spot mode increased after the pump light is regulated by the near-zero refractive index material relative to the order before regulation.

[0084] The transfer function fitting coefficient obtained after fitting n=3, for example, the original incident beam is Gaussian light with a TEM00 mode. After reflection from a near-zero refractive index material, it becomes a third-order Gaussian light, TEM33. This third-order mode is mathematically equivalent to taking the third derivative of the laser distribution. Similarly, if the original incident beam is Gaussian light with a TEM13 mode, the spot pattern becomes TEM46 after reflection from a near-zero refractive index material.

[0085] Similarly, when the transfer function fitting coefficients obtained after fitting are n =4, the original incident light beam is Gaussian light with TEM00 mode, which becomes 4th-order Gaussian light TEM44 after reflection from the material with near-zero refractive index.

[0086] Therefore, by using near-zero refractive index materials, arbitrary control of the pump beam can be achieved, which can greatly reduce the size of the shaping system. Moreover, compared with local planar optics, the co-optical axis problem in the design is avoided.

[0087] Below through Figure 2-Figure 5 The wavefront control effect of an embodiment of the present invention is further described.

[0088] Taking the pump light wavelength of 969nm as an example, transparent metal oxide indium tin oxide ITO is selected as the near-zero refractive index material, so that its refractive index n =0.1+1i. Where 0.1 is the real part and 1 is the imaginary part.

[0089] By adjusting the thickness of the near-zero refractive index material, the thickness of the near-zero refractive index material is obtained when the optical impedance of the near-zero refractive index material under environmental wrapping matches the optical impedance of the environmental medium. d =100nm.

[0090] Get as Figure 3 The simulation results of the reflection transfer function under the transverse electric polarization and TE polarization state at a wavelength of 969nm are shown as well as the following Figure 4 The simulation results of the reflection transfer function under transverse magnetic polarization and TM polarization are shown. It can be seen that the difference between the transfer functions under TE and TM polarization states is very small, and the two polarization states have the same effect on the transfer function of the near-zero refractive index material.

[0091] right Figure 3 and Figure 4 The reflection transfer function of the material with near-zero refractive index is fitted to obtain the transfer function of the material with near-zero refractive index. .

[0092] Figure 2 The electric field distribution of the incident light after passing through the near-zero refractive index material of this embodiment is shown. Figure 5 The light spot changes shown in the figure. At a wavelength of 969nm, Figure 5The fundamental mode Gaussian beam TEM00 pump light shown in (a) is regulated by the near-zero refractive index material to obtain the following Figure 5 (b) The high-order mode Gaussian beam TEM33 beam shown. Figure 5 (c) and Figure 5 (d) are Figure 5 (a) and Figure 5 (b) The intensity distribution of the light beam intercepted at the dotted line position is consistent with the mathematical principle that the output light is the third-order differential of the input light.

[0093] Example 2

[0094] The present invention also provides product embodiments that are based on the above embodiments, which are obtained through the method steps described in the above embodiments. The interpretation based on the same name meaning is the same as that of the above embodiments, and has the same technical effects as the above embodiments, which will not be repeated here.

[0095] The second embodiment of the present invention discloses a non-local planar optical wavefront shaping device, which is obtained by the method of embodiment 1 and is a thin film made of a near-zero refractive index material.

[0096] Example 3

[0097] A third embodiment of the present invention provides a non-local planar optical wavefront shaping system, comprising: a non-local planar optical wavefront shaping device 1 , a pump light source 2 , a beam splitter 3 , a focusing lens 4 and a photodetector 5 .

[0098] like Figure 6 As shown, pump light source 2 uses a laser operating at a wavelength of 969 nm. The response / output of a nonlocal planar optical system at a point on the output plane depends on the input field at that point within the spatial region. Therefore, the nonlocal planar optical wavefront shaping device 1 does not need to consider the center position and coaxiality of the beam; it only needs to fully cover the incident pump spot.

[0099] The pump light source 2 passes through the beam splitter 3 and hits the non-local planar optical wavefront shaping device 1. The light is reflected back to the beam splitter 3 and passes through the focusing lens 4 so that the shape and distribution of the light beam can be directly observed on the photodetector 5.

[0100] This system achieves pump beam shaping from a fundamental-mode Gaussian spot to a higher-order-mode Gaussian spot using only a nonlocal planar optical wavefront shaping device. Its compact structure reduces the overall system size and assembly complexity. Furthermore, the shaping system of this embodiment enables gain medium inversion ion beam augmentation and controlled photothermal bending of the gain medium.

[0101] Example 4

[0102] like Figure 7As shown, this embodiment provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method steps described in the above embodiment.

[0103] Example 5

[0104] The disclosed embodiments of the present invention provide a non-volatile computer storage medium, wherein the computer storage medium stores computer-executable instructions, and the computer-executable instructions can execute the method steps described in the above embodiments.

[0105] Example 6

[0106] Reference below Figure 7 , which shows a schematic diagram of the structure of an electronic device suitable for implementing the disclosed embodiments of the present invention. The terminal devices in the disclosed embodiments of the present invention may include, but are not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 7 The electronic device shown is only an example and should not limit the functions and scope of use of the embodiments disclosed in the present invention.

[0107] like Figure 7 As shown, the electronic device may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 401, which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 402 or programs loaded from a storage device 408 into a random access memory (RAM) 403. RAM 403 also stores various programs and data required for the operation of the electronic device. Processing device 401, ROM 402, and RAM 403 are interconnected via a bus 404. An input / output (I / O) interface 405 is also connected to bus 404.

[0108] Typically, the following devices may be connected to the I / O interface 405: an input device 406 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 407 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 408 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 409. The communication device 409 may allow the electronic device to communicate with other devices wirelessly or by wire to exchange data. Figure 7The electronic device is shown with various devices, but it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed instead.

[0109] In particular, according to the embodiments disclosed in the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication device 409, or installed from the storage device 408, or installed from the ROM 402. When the computer program is executed by the processing device 401, the above-mentioned functions defined in the method of the embodiment disclosed in the present invention are performed.

[0110] It should be noted that the computer-readable medium disclosed herein may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. Computer-readable storage media may include, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or components, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device, or component. In the present disclosure, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such a propagated data signal may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wire, optical cable, RF (radio frequency), or any suitable combination thereof.

[0111] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0112] Computer program code for performing the operations disclosed herein may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0113] The flow charts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products disclosed in various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, program segment, or a part of code, and the module, program segment, or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0114] The units involved in the embodiments described in the present invention may be implemented in software or hardware, wherein the name of a unit does not necessarily limit the unit itself.

Claims

1. A non-local planar optical wavefront shaping method, characterized in that: Use near-zero refractive index materials, including: Determining, according to a pump light wavelength band, a material having a near-zero refractive index in the pump light wavelength band; According to the phase thickness of the near-zero refractive index material in the environment, the thickness of the near-zero refractive index material is adjusted so that the optical impedance of the near-zero refractive index material in the environment matches the optical impedance of the environment medium, and a transverse magnetic polarization transfer function and a transverse electric polarization transfer function of the reflectivity coefficient of the near-zero refractive index material in transverse magnetic polarization and transverse electric polarization modes are obtained respectively; The expression of the phase thickness is: in, d represents the thickness of the near-zero refractive index material, represents the wave vector constant; n 1 represents the refractive index of the environment, n 2 represents the refractive index of the near-zero refractive index material; represents the incident angle onto the surface of the near-zero refractive index material; Fitting the transverse magnetic polarization transfer function and the transverse electric polarization transfer function to obtain the transfer function of the near-zero refractive index material , the transfer function of the near-zero refractive index material Relationship curve with transverse wave vector Satisfies the relationship: （1）； in, is the dimensionless fitting coefficient, express x Direction or y The transverse wave vector in the direction of n are the transfer function fitting coefficients.

2. The method according to claim 1, characterized in that The step of matching the optical impedance of the near-zero refractive index material in the environment with the optical impedance of the environment medium comprises: According to the refractive index of the ambient medium, the reflection coefficient of the near-zero refractive index material is changed by adjusting the phase thickness so that the reflection coefficient of the near-zero refractive index material approaches 0 or reaches a predetermined minimum value; The expression of the reflection coefficient of the near-zero refractive index material is: （2）； in, is the Fresnel reflection coefficient from the ambient medium to the material with near-zero refractive index; is the phase thickness of the near-zero refractive index material.

3. The method according to claim 1, characterized in that The near-zero refractive index material is a near-zero dielectric constant material.

4. The method according to claim 3, characterized in that The pump light wavelength band is a near-infrared wavelength band, and the near-zero refractive index material is: indium tin oxide, aluminum-doped zinc oxide or doped cadmium oxide.

5. The method according to claim 1, wherein The pump light wavelength band is a partial ultraviolet wavelength band, and the near-zero refractive index material is: copper, silver or aluminum nanoparticles.

6. The method according to any one of claims 1 to 4, characterized in that When the wavelength of the pump light is 969 nm, the near-zero refractive index material is indium tin oxide, and the thickness of the near-zero refractive index material is d =100nm, refractive index n =0.1+1 i : The transfer function of the near-zero refractive index material .

7. The method according to claim 6, characterized in that When the spot pattern of the pump light is When the light spot pattern after being shaped by the near-zero refractive index material is .

8. The method according to claim 7, characterized in that When the spot pattern of the pump light is a fundamental mode Gaussian beam TEM(0,0), the spot pattern after being shaped by the near-zero refractive index material is .

9. A non-local planar optical wavefront shaping device, characterized in that: Prepared by the method according to any one of claims 1 to 8.

10. A non-local planar optical wavefront shaping system, characterized in that: It comprises the non-local planar optical wavefront shaping device as claimed in claim 9.

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