Non-local plane optical wavefront shaping device, method and system

Abstract

The invention relates to the technical field of optical materials, and discloses a non-local plane optical wavefront shaping device, method and system, and the method comprises the steps: determining a material with a near-zero refractive index under a pumping light wave band according to the pumping light wave band; according to the phase thickness of the refractive index near-zero material wrapped in the environment, the thickness of the refractive index near-zero material is adjusted, so that the optical impedance of the refractive index near-zero material wrapped in the environment is matched with the optical impedance of an environment medium. Respectively obtaining a transverse magnetic polarization transfer function and a transverse electric polarization transfer function about the reflectivity coefficient of the material with the refractive index close to zero in the transverse magnetic polarization mode and the transverse electric polarization mode; and fitting the transverse magnetic polarization transfer function and the transverse electric polarization transfer function to obtain the transfer function of the material with the refractive index close to zero. According to the invention, the non-local plane is designed to shape the pumping beam, and the Gaussian beam of the fundamental mode is converted into the high-order mode, so that the inversion of the gain medium, the increase of the ion beam and the control of the bending of the gain medium under the light-heat effect are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of optical materials, and more particularly, 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 pumping light beam and the gain medium can be achieved, thereby affecting the population inversion of the gain medium and the thermal mirror effect of the gain medium, etc.

[0003] The shaping technology of pumping light is divided into the categories of local planar optics and non-local planar optics. The local planar optics category mainly uses diffractive optical elements, spatial light modulators (liquid crystal modulators), lens-fiber coupling, microlens arrays, and aspherical mirrors (free-form mirrors), etc. According to the laterally non-uniform structure designed by engineering, the transmission / reflection of waves is controlled locally and point by point. That is, the output of a single optical element at a certain position on its output plane depends only on the input at a specific point. This results in that a single local device cannot achieve a wide range of functions beyond position-dependent wavefront transformation. For example, a single refractive optical element cannot perform different-order Hermite-Gaussian mode changes alone, such as the conversion from the fundamental transverse mode to the high-order mode. Non-local planar optics can overcome some limitations of traditional optics and local planar optics. Devices with effective non-local input-output responses (such as thin films or metasurfaces) can move from real space to momentum / wave vector space, that is, the spatial Fourier space, that is, the space corresponding to the plane-wave expansion of the field.

[0004] Therefore, non-local planes can be used to achieve arbitrary control of the pumping light beam from the fundamental mode Gaussian beam to the high-order mode. Summary of the Invention

[0005] The object of the present invention is to provide a non-local planar optical wavefront shaping device, method and system, which can solve at least one of the above-mentioned technical problems. The specific solutions are as follows: According to a specific embodiment disclosed by the present invention, a first aspect of the present invention discloses a non-local planar optical wavefront shaping method, including: using a material with a near-zero refractive index, including: Determine a material with a near-zero refractive index at the pumping light band according to the pumping light band; According to the phase thickness of the material with a near-zero refractive index under environmental encapsulation, adjust the thickness of the material with a near-zero refractive index so that the optical impedance of the material with a near-zero refractive index under environmental encapsulation matches the optical impedance of the environmental medium, and respectively obtain a transverse magnetic polarization transfer function and a transverse electric polarization transfer function of the reflectivity coefficient of the material with a near-zero refractive index in the transverse magnetic polarization and transverse electric polarization modes; The expression of the phase thickness is:

[0006] Among them, 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 on 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 The relationship curve with the transverse wave vector satisfies the relation: (1); Among them, is a dimensionless fitting coefficient, represents x the transverse wave vector in the y direction or the n direction,

[0007] Preferably, making the optical impedance of the near-zero refractive index material under the environmental wrapping match the optical impedance of the environmental medium includes: According to the refractive index of the environmental medium, by adjusting the phase thickness to change the reflection coefficient of the near-zero refractive index material, making the reflection coefficient of the near-zero refractive index material approach 0 or reach a predetermined minimum value; The expression of the reflection coefficient of the near-zero refractive index material is: (2); Among them, is the Fresnel reflection coefficient from the environmental medium to the near-zero refractive index material; is the phase thickness of the near-zero refractive index material.

[0008] Preferably, the near-zero refractive index material is a near-zero dielectric constant material.

[0009] Preferably, the pump light band is the near-infrared band, and the near-zero refractive index material is: indium tin oxide, aluminum-doped zinc oxide or doped cadmium oxide.

[0010] Preferably, the pump light band is the near-ultraviolet band, and the near-zero refractive index material is: copper, silver or aluminum nanoparticles.

[0011] Preferably, when the wavelength band 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 d = 100 nm, and the refractive index n = 0.1 + 1 i : The transfer function of the near-zero refractive index material .

[0012] Preferably, when the spot mode of the pump light is , the spot mode after shaping by the near-zero refractive index material is .

[0013] Preferably, when the spot mode of the pump light is the fundamental mode Gaussian beam TEM(0,0), the spot mode after shaping by the near-zero refractive index material is .

[0014] According to the specific embodiments disclosed in the present invention, a second aspect of the present invention discloses a nonlocal planar optical wavefront shaping device, which is obtained by the above method.

[0015] According to the specific embodiments disclosed in the present invention, a third aspect of the present invention discloses a nonlocal planar optical wavefront shaping system, including the above nonlocal planar optical wavefront shaping device.

[0016] Compared with the prior art, the above solutions disclosed in the present invention have at least the following beneficial effects: By designing nonlocal planar shaping of the pump beam, the present invention converts the fundamental mode Gaussian beam into a high-order mode, thereby realizing gain medium inversion, ion beam increase, and controlling the bending of the gain medium by the light-thermal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the disclosure of the present invention, and are used together with the specification to explain the principles of the disclosure of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the disclosure of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings: Figure 1 is a flowchart of a nonlocal optical wavefront shaping method according to a first embodiment of the present invention; Figure 2 is an electric field distribution diagram of a wavefront shaping process according to an embodiment of the present invention; Figure 3 is a transverse electric polarization transfer function curve diagram according to an embodiment of the present invention; Figure 4It is the transverse magnetic polarization transfer function curve graph of an embodiment of the present invention; Figure 5 It is the comparison graph of the wavefront shaping effect of the non-local planar optical system of an embodiment of the present invention; Figure 6 It is the structural schematic diagram of a non-local optical wavefront shaping system according to the first embodiment of the present invention; Figure 7 It is the structural schematic diagram of the electronic device provided by the embodiment of the present invention.

[0018] Reference numerals: 1 - Non-local planar optical wavefront shaping device; 2 - Pump light source; 3 - Beam splitter; 4 - Condensing lens; 5 - Photoelectric detector. Specific embodiments

[0019] In order to make the purpose, technical solutions and advantages of the disclosure of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the disclosure of the present invention, rather than all embodiments. Based on the embodiments disclosed in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the disclosure of the present invention.

[0020] The terms used in the embodiments of the disclosure of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the disclosure of the present invention. The singular forms "a", "the" and "said" used in the embodiments of the disclosure of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0021] It should be understood that the term "and / or" used herein is only a description of the associated relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0022] It should be understood that although terms such as first, second, and third may be used in the embodiments of the disclosure of the present invention, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the disclosure of the present invention, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0023] Depending on the context, as used herein, the words "if" and "when" may be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0024] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the commodity or device comprising said element.

[0025] The optional embodiments disclosed in the present invention will be described in detail below with reference to the accompanying drawings.

[0026] When a light beam with a wavelength of is incident on the surface of an optical element with a Gaussian-type electric field distribution, the output electric field and the incident electric field have the relationship: .

[0027] Wherein, x , y is the spatial position of the light beam; are respectively the components of the transverse wave vector in the x and y directions.

[0028] , and are respectively the incident angle and the circular arc angle along the transmission direction z of the incident light beam, is the wave vector constant, .

[0029] Therefore, the present invention utilizes the nonlocal effect of the near-zero refractive index material to realize the wavefront regulation of the light beam by designing the transfer function of the near-zero refractive index material, so that it has a high-order Gaussian-type electric field distribution according to the requirements, realizing efficient wavefront light regulation. Embodiment 1

[0030] The first embodiment of the present invention provides a nonlocal planar optical wavefront shaping method using a near-zero refractive index material, comprising the following steps: Step S102: Determine a material with near-zero refractive index at the pump light wavelength band according to the pump light wavelength band.

[0031] Specifically, a material with near-zero refractive index refers to a material whose real part of the refractive index approaches zero at a specific wavelength.

[0032] In a preferred embodiment of the present invention, a transparent conductive oxide with a real part of the dielectric constant approaching zero can be used in the near-infrared wavelength band, such as indium tin oxide (ITO), aluminum-doped zinc oxide (AZO), or doped cadmium oxide (CdO).

[0033] In other embodiments, copper, silver, or aluminum nanoparticles with metal nanostructures can be selected in the near-ultraviolet wavelength band. When they are near the plasma frequency, the real part of the dielectric constant can approach zero and they can exhibit characteristics similar to those of a material with near-zero refractive index, equivalent to a material with near-zero refractive index.

[0034] In other embodiments, a metasurface material with a metal-dielectric multilayer film can also be selected.

[0035] Step S104: Adjust the thickness of the material with near-zero refractive index according to the phase thickness of the material with near-zero refractive index under environmental encapsulation, so that the optical impedance of the material with near-zero refractive index under environmental encapsulation matches the optical impedance of the environmental medium, and respectively obtain a transverse magnetic polarization transfer function and a transverse electric polarization transfer function of the reflectivity coefficient of the material with near-zero refractive index in the transverse magnetic polarization and transverse electric polarization modes.

[0036] Specifically, the expression for the phase thickness of the material with near-zero refractive index is:

[0037] where d represents the thickness of the material with near-zero refractive index, represents the wave vector constant; n 1 represents the refractive index of the environment, n 2 represents the refractive index of the material with near-zero refractive index; represents the incident angle on the surface of the material with near-zero refractive index.

[0038] The optical impedance is directly related to the permittivity and permeability of the material. Different materials have different permittivities and permeabilities, and thus different optical impedances. When light waves enter from one medium into another, the difference in optical impedance causes part of the light to be reflected and part to be transmitted. If the optical impedances of the two media match well, the reflection efficiency of light will be reduced.

[0039] When the refractive index near-zero material with a refractive index of n 2 is wrapped by an ambient medium with a refractive index of n 1 according to the principle of multi-beam coherent cancellation, the reflection coefficient r of the refractive index near-zero material is: (2); where, is the Fresnel reflection coefficient from the ambient medium to the refractive index near-zero material; is the phase thickness of the refractive index near-zero material.

[0040] Therefore, at the pump wavelength and the incident angle , by adjusting the thickness d of the refractive index near-zero material, different matching effects can be achieved between the overall optical impedance of the refractive index near-zero material - ambient medium and the optical impedance of the ambient medium.

[0041] That is, by adjusting the longitudinal phase thickness of the refractive index near-zero material to compensate for the impedance matching of the electric field components in the transverse magnetic polarization and transverse electric polarization directions at the interface, the reflection coefficient of the refractive index near-zero material approaches zero or reaches a predetermined minimum value at normal incidence ( is 0). As the incident angle increases, the impedance gradually mismatches and the reflection coefficient gradually increases.

[0042] In other embodiments, the real part of the refractive index near-zero material can be controlled to be zero or tend to zero by selecting different manufacturing methods of the refractive index near-zero material.

[0043] In non-local planar optics, the components of the transverse wave vector are used to achieve non-local regulation of light waves. Therefore, under the condition of adjusting the thickness of the refractive index near-zero material to satisfy certain optical impedance matching, by simulating the refractive index near-zero material, the reflection transfer functions of different polarization states at the pump light wavelength can be obtained.

[0044] Step S106, fitting the transverse magnetic polarization transfer function and the transverse electric polarization transfer function to obtain the transfer function of the refractive index near-zero material .

[0045] 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 The relationship curve with the transverse wave vector Satisfies the relation: (1); Where, Is a dimensionless fitting coefficient, Represents x Direction or y The transverse wave vector in the direction, n Is the transfer function fitting coefficient.

[0046] Specifically, the transfer function fitting coefficient n Represents the order increase of the pump light spot mode after being regulated by the near-zero refractive index material relative to the pump light spot mode before regulation.

[0047] Taking the transfer function fitting coefficient n = 3 obtained after fitting as an example, the originally incident beam is a Gaussian light with TEM00 mode, and after being reflected by the near-zero refractive index material, it becomes a third-order Gaussian light TEM33. This third-order mode is equivalent to differentiating the distribution of the laser three times mathematically. Similarly, if the originally incident beam is a Gaussian light with TEM13 mode, the spot mode becomes TEM46 after being reflected by the near-zero refractive index material.

[0048] Similarly, when the transfer function fitting coefficient n = 4 obtained after fitting, the originally incident beam is a Gaussian light with TEM00 mode, and after being reflected by the near-zero refractive index material, it becomes a fourth-order Gaussian light TEM44.

[0049] Therefore, by using the near-zero refractive index material, arbitrary control of the pump beam can be achieved, which can greatly reduce the size of the shaping system. Moreover, compared with local plane optics, the problem of coaxial light in design is avoided.

[0050] Next, the wavefront regulation effect of an embodiment of the present invention is further described through Figures 2 - 5 Taking the pump light wavelength of 969 nm as an example, indium tin oxide ITO, a transparent metal oxide, is selected as the near-zero refractive index material, and its refractive index

[0051] = 0.1 + 1i. Among them, 0.1 is the real part and 1 is the imaginary part. n = 0.1 + 1i. Among them, 0.1 is the real part and 1 is the imaginary part.

[0052] 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 in the environment is matched with the optical impedance of the environment medium. d =100nm.

[0053] 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 in FIG. Figure 4 The simulation results of the reflection transfer function under transverse magnetic polarization and TM polarization states are shown. It can be seen that the transfer functions under TE and TM polarization states are very different, and the two polarization states have the same influence on the transfer function of the near-zero refractive index material.

[0054] 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. .

[0055] 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 change of the light spot shown is known. At a wavelength of 969nm, Figure 5 The fundamental mode Gaussian beam TEM00 pump light shown in (a) is regulated by a 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 conforms to the mathematical principle that the output light is the third-order differential of the input light.

[0056] Example 2 The present invention also provides product embodiments that are derived from the above embodiments, which are obtained through the method steps described in the above embodiments, and the interpretation based on the same name meanings is the same as the above embodiments, and has the same technical effects as the above embodiments, which will not be repeated here.

[0057] 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.

[0058] Example 3 The 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 .

[0059] like Figure 6As shown, the pump light source 2 selects a light source of a laser with a working wavelength of 969 nm. The response / output of nonlocal planar optics at a certain point on the output plane depends on the input field within a certain range of points in the spatial region. Therefore, the nonlocal planar optical wavefront shaping device 1 does not need to consider the central position and coaxial problem of the light beam, as long as the incident pump light spot is fully covered.

[0060] The pump light source 2 passes through the beam splitter 3 and hits the nonlocal planar optical wavefront shaping device 1. The light reflected back to the beam splitter 3 passes through the condenser lens 4, and the beam shape and distribution can be directly observed on the photodetector 5.

[0061] This system only realizes the shaping effect of the pump beam from the fundamental mode Gaussian spot to the high-order mode Gaussian spot through the nonlocal planar optical wavefront shaping device, and the structure is compact, reducing the overall size and assembly and alignment complexity of the system. And through the shaping system of this embodiment, it is possible to increase the gain medium inversion ion beam and control the bending of the gain medium caused by the photo-thermal effect.

[0062] Embodiment 4 As Figure 7 shown, this embodiment provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method steps as described in the above embodiments.

[0063] Embodiment 5 The disclosed embodiments of the present invention provide a non-volatile computer storage medium, which stores computer-executable instructions that can execute the method steps as described in the above embodiments.

[0064] Embodiment 6 Next, refer to Figure 7 , which shows a schematic structural diagram of an electronic device suitable for implementing the disclosed embodiments of the present invention. The terminal device in the disclosed embodiments of the present invention may include, but is 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), in-vehicle terminals (such as in-vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The electronic device shown is only an example and should not impose any limitations on the functions and usage scope of the disclosed embodiments of the present invention.

[0065] As Figure 7As shown, the electronic device may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 401, which may perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 402 or the program loaded from the storage device 408 into the random access memory (RAM) 403. In the RAM 403, various programs and data required for the operation of the electronic device are also stored. The processing device 401, the ROM 402, and the RAM 403 are connected to each other through a bus 404. The input / output (I / O) interface 405 is also connected to the bus 404.

[0066] Generally, 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 wiredly to exchange data. Although Figure 7 an electronic device with various devices is shown, it should be understood that it is not required to implement or have all the shown devices. Instead, more or fewer devices may be implemented or had.

[0067] In particular, according to the embodiments disclosed in the present invention, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, the embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from the network through 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 functions defined in the methods of the embodiments disclosed in the present invention are executed.

[0068] It should be noted that the computer-readable medium disclosed in the present invention can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of a computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the disclosure of the present invention, a computer-readable storage medium can be any tangible medium that contains or stores a program, which can be used by or in conjunction with an instruction execution system, apparatus, or device. In the disclosure of the present invention, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on a computer-readable medium can be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0069] The above computer-readable medium can be included in the above electronic device; or it can exist separately without being assembled into the electronic device.

[0070] The computer program code for performing the operations disclosed in the present invention can be written in one or more programming languages or combinations thereof. The above programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can 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 it can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0071] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments disclosed in the present invention. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a portion of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that, in some alternative implementations, the functions noted in the blocks may occur in a different order than that noted in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0072] The units described in the embodiments disclosed in the present invention can be implemented in software or in hardware. Among them, the name of the unit does not constitute a limitation to the unit itself in some cases.

Claims

1. A non-local planar optical wavefront shaping method, characterized in that: Use near-zero refractive index materials, including: Determining, according to the 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 under environmental wrapping, the thickness of the near-zero refractive index material is adjusted so that the optical impedance of the near-zero refractive index material under environmental wrapping matches the optical impedance of the environmental 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 under 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 The relationship curve with the 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 a 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 wave band is a near-infrared wave 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, characterized in that The pump light waveband is a partial ultraviolet waveband, 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 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: Comprising the non-local planar optical wavefront shaping device as described in claim 9.

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