Light-emitting super-structure surface capable of realizing incoherent fluorescent holography and multi-dimensional super-structure display and preparation method of light-emitting super-structure surface

Abstract

The invention discloses a light-emitting super-structure surface capable of realizing incoherent fluorescence holography and multi-dimensional super-structure display and a preparation method thereof. The light-emitting super-structure surface is mainly composed of an optical waveguide structure layer, a micro-nano structure layer and a fluorescence emission layer. The optical waveguide structure layer comprises a substrate and a waveguide layer and is responsible for guiding fluorescence propagation; the micro-nano structure layer is located above the waveguide layer, is composed of nano bricks and can regulate and control light; the fluorescence emission layer is arranged above the micro-nano structure layer, contains quantum dots and is excited by the pump light to emit fluorescence. The metasurface can regulate and control the emergent angle, wavefront and emergent intensity of fluorescent light and pump light, the time-space coherence of the fluorescent light is enhanced through the waveguide layer, and phase modulation is carried out by using a method based on a circuitous phase. Based on the super-structure surface, through the steps of fluorescence excitation, coherence enhancement, phase modulation, diffraction calculation, hologram generation, multi-dimensional display and the like, incoherent fluorescence hologram and multi-dimensional super-structure display can be achieved, and the functions of fluorescence nanometer printing and multi-channel holographic display are covered.

Description

Technical Field

[0001] The present invention belongs to the field of micro-nano optics and fluorescence radiation technology, and specifically relates to a luminescent metasurface, a preparation method and application thereof, and a method for realizing incoherent fluorescence holography and multi-dimensional metadisplay. Background Art

[0002] Fluorescence, a common luminescence phenomenon, has a wide range of applications in lighting, biosensing, optical imaging, spectroscopy, and other fields. However, fluorescence has weak spatiotemporal coherence and a random initial phase, which makes precise phase modulation and encoding extremely difficult, severely limiting the construction of complex light fields and the implementation of related functions. For example, in traditional fluorescence display and imaging technologies, these characteristics of fluorescence make it difficult to achieve high-resolution, high-contrast image display and accurate information transmission.

[0003] In recent years, the development of metasurface technology has shown great potential in light field manipulation. Metasurfaces can flexibly control the amplitude, phase, and polarization of light, providing new insights into fluorescence-related issues. However, many challenges remain in achieving precise control of incoherent fluorescence using metasurfaces, particularly in achieving incoherent fluorescence holography and multidimensional displays. Existing technologies have shortcomings in the accuracy of fluorescence phase modulation, the functional integration of multidimensional displays, and the feasibility of practical applications, failing to meet the growing demand for high-performance optical devices and multifunctional optical applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a luminescent metasurface, a preparation method and application thereof, and a method for realizing incoherent fluorescence holography and multi-dimensional metadisplay. Through unique structural design and light field control methods, the difficult problems of precise phase modulation of incoherent fluorescence and construction of complex light fields are solved, efficient incoherent fluorescence holography and multi-dimensional metadisplay functions are realized, and the application scope of fluorescence in the optical field is expanded.

[0005] According to one aspect of the present invention, there is provided a luminescent metasurface, comprising: Optical waveguide structure layer: comprising a substrate and a waveguide layer located on the substrate, wherein the waveguide layer is used to guide the propagation of fluorescent light and pump light in the form of guided waves; Micro-nanostructure layer: arranged above the waveguide layer, composed of nanobricks, which are used to regulate the light in the form of waveguides; Fluorescence emission layer: located at a specific position above the micro-nanostructure layer, containing quantum dots, which are used to emit fluorescence under the excitation of pump light.

[0006] As a further technical solution, the micro-nanostructure layer controls the emission angle and the emission wavefront of the radiated fluorescence and the scattered pump light by adjusting the parameters of the micro-nanostructure.

[0007] As a further technical solution, the emission angle satisfies a wave vector matching condition.

[0008] As a further technical solution, the phase modulation of the micro-nanostructure layer adopts a circuitous phase-based method, which is determined by the relative displacement of the nanobricks relative to the periodic lattice.

[0009] As a further technical solution, the quantum dots in the fluorescent emission layer emit fluorescence under the excitation of specific pump light, and the pump light and the fluorescence have different central wavelengths.

[0010] As a further technical solution, the waveguide layer performs guided mode selection on the fluorescence emitted by the fluorescence emitting layer.

[0011] According to one aspect of the present invention, a method for realizing incoherent fluorescence holography and multi-dimensional metadisplay based on the luminescent metasurface is provided, comprising: Using pump light to excite the quantum dots in the fluorescent emission layer to emit fluorescence; The spatiotemporal coherence of fluorescence is enhanced through the guided mode selection process of the waveguide layer; The unidirectional extraction and radiation of fluorescence is achieved by using a micro-nanostructure layer that meets the wave vector matching conditions, and the phase of the extracted fluorescence is modulated by a circuitous phase, so that the emitted fluorescence emits Fresnel diffraction in the diffraction process of free space; An optimization algorithm is used to optimize the phase distribution of the micro-nanostructure layer to generate a Fresnel hologram of incoherent fluorescence; The micro-nanostructure layer is used to independently regulate pump light and fluorescence in different dimensions to achieve a multi-dimensional meta-display including near-field and far-field. The multi-dimensional meta-display includes at least fluorescent nano-printing and holographic display functions.

[0012] As a further technical solution, the method further includes: Control the period of superatoms in the micro-nanostructure layer to achieve fluorescent nanoprinting function; By utilizing the independent degrees of freedom of the micro-nanostructure layer to perform circuitous phase modulation of pump light and fluorescence in orthogonal directions, multi-channel display is achieved, including at least dual fluorescent nano-printing channels, dual fluorescent Fresnel hologram channels and dual pump light far-field hologram channels.

[0013] According to one aspect of the present invention, applications of the luminescent metasurface are provided, and the luminescent metasurface is applied to the preparation of programmable fluorescent emitters, optical anti-counterfeiting, optical information encryption and storage, and next-generation multi-dimensional displays.

[0014] According to one aspect of the present invention, there is provided a method for preparing the luminescent metasurface, comprising: depositing a waveguide layer material on the substrate to form a waveguide layer; Prepare a micro-nanostructure layer on the waveguide layer and determine the structure and arrangement of superatoms; A fluorescent emission layer is prepared above the micro-nanostructure layer, and a material containing quantum dots is deposited at specific locations.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Through a unique structural design, the present invention achieves precise phase modulation and efficient light field control of incoherent fluorescence, successfully solving the problem of difficulty in precise control of fluorescence due to random phase and weak coherence. It realizes incoherent fluorescence holography for the first time and expands the application boundaries of fluorescence in the field of optics.

[0016] 2. The present invention can realize multi-dimensional meta-display, integrate fluorescent nano-printing and multi-channel holographic display functions, and provide rich optical information display in both near and far fields. It provides new direction and technical support for the development of next-generation display technology and improves the resolution, contrast and functional diversity of the display.

[0017] 3. The luminescent metasurface of the present invention has broad application prospects in the fields of programmable fluorescent emitters, optical anti-counterfeiting, optical information encryption and storage, etc., which will help promote technological progress in related fields and improve product performance and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction will be given below to the drawings used in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] FIG1 is a schematic diagram of omnidirectional fluorescence radiation, unidirectional fluorescence radiation, and guided wave mode propagation according to an embodiment of the present invention, and also shows momentum space diagrams of fluorescence and pump light at different positions; FIG2 is a schematic diagram showing the fluorescence spectrum of the film structure, the fluorescence spectrum of the metasurface, and the pump light spectrum of the metasurface provided by an embodiment of the present invention; FIG3 is a comparison of the coherence of different light sources provided by an embodiment of the present invention, illustrating the differences in coherence between lasers, fluorescence after waveguide mode selection, halogen lamp white light, and quantum dot fluorescence, as well as a comparative analysis of the phase modulation of incoherent fluorescence and coherent pump light; FIG4 is a specific design flow chart of a luminescent metasurface provided by an embodiment of the present invention, and a schematic SEM image of the prepared structure; FIG5 is a schematic diagram of images of the fluorescence channel and the pump light channel at different positions (0 μm, 400 μm, 150 mm) of the coherent pump light hologram and the incoherent fluorescence hologram provided by an embodiment of the present invention; FIG6 is a schematic diagram showing images of a fluorescent nano-printing channel, an incoherent holographic channel, and a coherent pump light holographic channel under Y-direction excitation and X-direction excitation, provided by an embodiment of the present invention.

[0020] Figure 7 A conceptual diagram of the structure and function of the luminescent metasurface provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] It should be noted that: The terms "including" and "having" and any variations thereof in the description and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions, for example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to the steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0022] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices. The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be executed in the order described. For example, some operations / steps may be further decomposed, while others may be combined or partially combined, so the actual execution order may vary depending on the actual situation.

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In addition, the technical features in the various embodiments or single embodiments provided by the present invention are arbitrarily combined with each other to form a new technical solution. This combination is not restricted by the sequence of steps and / or structural composition mode, but must be based on the ability of ordinary technicians in this field to implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that this combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The present invention relates to a luminescent metasurface that realizes incoherent fluorescence holography and multi-dimensional metadisplay, as well as its preparation method, display method and application. The luminescent metasurface is mainly composed of an optical waveguide structure layer, a micro-nanostructure layer and a fluorescent emission layer. The conceptual diagram is shown in FIG. Figure 7 As shown. The optical waveguide structure layer contains a substrate and a waveguide layer, which is responsible for guiding the propagation of fluorescence; the micro-nanostructure layer is located above the waveguide layer, composed of nanobricks, and can control light; the fluorescent emission layer is above the micro-nanostructure layer, contains quantum dots, and emits fluorescence when stimulated by pump light. This metasurface can control the exit angle and exit wavefront of fluorescence and pump light, enhance the spatiotemporal coherence of fluorescence through the waveguide layer, and perform phase modulation using a method based on a roundabout phase. Based on this metasurface, through the steps of exciting fluorescence, enhancing coherence, phase modulation and diffraction, hologram generation and multi-dimensional display, incoherent fluorescence holography and multi-dimensional metadisplay can be realized, covering fluorescence nanoprinting and multi-channel holographic display functions. This metasurface can be applied to programmable fluorescent emitters, optical anti-counterfeiting, optical information encryption storage and next-generation multi-dimensional display devices.

[0025] The following introduces the technical solution of the present invention from the perspectives of the luminescent metasurface structure, light field control principles, fluorescence characteristics and coherence enhancement, methods for realizing incoherent fluorescence holography and multi-dimensional metadisplay, preparation methods and application fields.

[0026] Luminescent metasurface structure: The luminescent metasurface of the present invention includes an optical waveguide structure layer, a micro-nano structure layer and a fluorescent emission layer. The optical waveguide structure layer includes a substrate and a waveguide layer located above the substrate. The substrate provides support for the propagation of light. The waveguide layer is used to guide the propagation of fluorescence in the form of waveguides, so that the fluorescence is transmitted in a specific path, reducing energy loss and enhancing its propagation characteristics. The micro-nano structure layer is arranged above the waveguide layer and is composed of nanobricks. The nanobricks can regulate light in the form of waveguides. By adjusting the parameters such as the structure, arrangement and period of the nanobricks, the emission angle and wavefront of the fluorescence and pump light can be precisely controlled. The fluorescent emission layer is located at a specific position above the micro-nano structure layer and includes quantum dots. Under the excitation of pump light, the quantum dots can emit fluorescence.

[0027] Light field control principle: The luminescent metasurface can control the emission angle and wavefront of the radiated fluorescence and scattered pump light. The emission angle satisfies the wave vector matching condition: k out = k guide + k meta ， sin θ out = n eff + mλ / P .in, k out is the wave vector of the output light, k guide is the wave vector of the guided mode light, k meta The effective wave vector provided for the metasurface micro-nanostructure, λ is the wavelength of light, θ out is the diffraction angle of the output light, n eff is the effective refractive index of the guided mode light, m is the diffraction order number, P is the period of the nanobricks. By satisfying this wave vector matching condition, directional light emission and efficient outcoupling are achieved. Phase modulation utilizes a circuitous phase-based approach, determined by the relative displacement of the nanobricks relative to the periodic lattice. This phase modulation method enables precise control of the phase distribution of light, laying the foundation for incoherent fluorescence holography and multidimensional displays.

[0028] Enhanced fluorescence properties and coherence: Quantum dots in the fluorescence emission layer emit fluorescence under the stimulation of specific pump light, with the pump light and fluorescence having different central wavelengths. The waveguide layer selects the guided mode of the fluorescence emitted by the fluorescence emission layer, significantly enhancing the spatiotemporal coherence of the fluorescence. This enables fluorescence, which previously had poor coherence, to meet the requirements of holographic imaging and high-quality light field manipulation, enhancing its application value.

[0029] Method for realizing incoherent fluorescence holography and multi-dimensional meta-display: Based on the above-mentioned luminescent metasurface, the method for realizing incoherent fluorescence holography and multi-dimensional meta-display comprises the following steps: Fluorescence excitation step: Use pump light to excite the quantum dots in the fluorescence emission layer, causing them to emit fluorescence, providing a light source for subsequent light field control.

[0030] Coherence enhancement step: Through the guided mode selection process of the waveguide structure, the spatiotemporal coherence of the fluorescence is enhanced and the quality of the fluorescence is improved.

[0031] Phase modulation and diffraction step: The guided mode fluorescence is locally phase modulated using the micro-nanostructure layer, causing Fresnel diffraction to occur during propagation while satisfying the wave vector matching condition, achieving unidirectional extraction and radiation of the fluorescence, and efficiently coupling the fluorescence from the waveguide into free space.

[0032] Hologram generation steps: Use optimization algorithms, such as the improved gradient descent algorithm (GDA), to optimize the phase distribution of the micro-nanostructure layer, generate a Fresnel hologram of incoherent fluorescence, and realize the holographic display of incoherent fluorescence.

[0033] Multidimensional display steps: Utilizing the micro-nanostructure layer to independently control pump light and fluorescence in different dimensions, a multidimensional meta-display encompassing both near-field and far-field is achieved. Specifically, by controlling the period of the micro-nanostructure layer, fluorescence nanoprinting is achieved, allowing customization of fluorescence emission intensity within a specific observation angle range. Utilizing the independent degrees of freedom of the micro-nanostructure layer to perform circuitous phase modulation of pump light and fluorescence in orthogonal directions, a multi-channel display is achieved, comprising at least dual fluorescence nanoprinting channels, dual fluorescence Fresnel hologram channels, and dual pump light far-field hologram channels.

[0034] Preparation method: The method for preparing the luminescent metasurface of the present invention includes the following steps: depositing a waveguide layer material on a substrate to form a waveguide layer, ensuring that the waveguide layer has good optical properties and structural stability; preparing a micro-nanostructure layer on the waveguide layer, determining the structure and arrangement of the nanobricks through processes such as photolithography and etching, and precisely controlling the size and shape of the micro-nanostructure; preparing a fluorescent emission layer above the micro-nanostructure layer, and depositing a material containing quantum dots in a suitable manner at specific locations to ensure uniform distribution of the quantum dots and good luminescence performance.

[0035] Applications: The luminescent metasurfaces of this invention can be used in the preparation of programmable fluorescent emitters, optical anti-counterfeiting, optical information encryption and storage, and next-generation multi-dimensional displays. In programmable fluorescent emitters, the emission characteristics of the fluorescent light can be precisely controlled according to requirements. In optical anti-counterfeiting, the unique light field control and multi-channel display capabilities enable the creation of difficult-to-copy anti-counterfeiting markings. In optical information encryption and storage, the multi-dimensional display and encrypted light field distribution improves the storage capacity and security of information. In next-generation multi-dimensional displays, high-resolution, multi-functional displays are provided to meet users' higher demands for display technology.

[0036] Preferably, the embodiment of the present invention provides a luminescent metasurface that can realize incoherent fluorescence holography and multi-dimensional metadisplay, and experimentally demonstrates the multiplexing of fluorescence holography and pump light holography, as well as six-channel metadisplay.

[0037] As an example, Figure 1 The structure of the metasurface is demonstrated. The processing flow is as follows: first, a 500 μm thick fused quartz is selected as the substrate, and a 190-220 nm thick silicon nitride layer is deposited on the substrate using plasma enhanced chemical vapor deposition (PECVD) technology to form a waveguide layer for guiding fluorescence to propagate in a waveguide mode. The refractive index of the waveguide layer (about 2.05) forms an optical constraint with the substrate (refractive index 1.45) to ensure efficient transmission of fluorescence in the waveguide. A 360-400 nm thick silicon (Si) layer is deposited above the waveguide layer by PECVD as a carrier of the micro-nano structure. Electron beam lithography (EBL) technology is used to define the nanobrick array pattern on the PMMA photoresist coated on the surface of the silicon layer (as shown in the schematic diagram of the micro-nano structure in Figure 1). The nanobrick is square with a side length of 140-200 nm and a period of 300-500 nm. The pattern is transferred to the silicon layer by reactive ion etching (RIE) to form a micro-nano structure layer. This structural layer is formed by the period of the nanobrick ( P ) and the wave vector matching condition of relative displacement controlled light ( k out = k guide + k meta ) and its circuitous phase modulation to achieve the emission angle and phase modulation of fluorescence and pump light. A PMMA film containing quantum dots (such as CdSe / ZnS core-shell structure quantum dots, with a diameter of about 12 nm) is spin-coated on the micro-nanostructure layer to form a fluorescence emission layer. When excited by 532 nm pump light, the quantum dots emit fluorescence with a central wavelength of 622 nm (such as Figure 1The thickness of the inset quantum dot structure and the fluorescence spectrum in Figure 2 is controlled at 100-150 nm by the spin coating speed (2000-4000 rpm) to ensure sub-wavelength distance coupling with the micro-nanostructure layer.

[0038] As shown in Figure 2, when the 532 nm pump light enters the waveguide layer through end-fire coupling (Position I in Figure 1), it excites the quantum dots in the fluorescence emission layer to produce omnidirectional fluorescence (Figure 2 Film layer fluorescence radiation). After the fluorescence enters the waveguide layer (Position II), its spatiotemporal coherence is enhanced by about two orders of magnitude compared to free space radiation through the guided mode selection effect (Figure 3 Coherence comparison), providing a stable light field foundation for subsequent phase modulation. The nanobricks in the micro-nanostructure layer introduce a circuitous phase through relative displacement, and perform local phase modulation on the guided mode fluorescence (Figure 3 Phase modulation mechanism). When the fluorescence propagates to the micro-nanostructure layer (Position III), the wave vector matching condition is met ( k out = k guide + k meta ， sin θ out = n eff + mλ / P ), achieving unidirectional extraction (Figure 2 Metasurface fluorescence radiation), whose emission angles are separated by the difference in effective refractive index and wavelength between the fluorescence (622 nm) and the pump light (532 nm) (Figure 2 Spectral comparison).

[0039] like Figure 4 As shown in the algorithm optimization flowchart, an improved gradient descent algorithm (GDA) is used to optimize the phase distribution of the micro-nanostructure. The angular spectrum method (ASM) is used to calculate the fluorescence Fresnel hologram. Meanwhile, a fast Fourier transform (FFT) is used to generate the far-field hologram of the pump light. After 2000 iterations, good multi-channel holographic optimization results can be achieved in the simulation.

[0040] like Figure 5 As shown in the figure, in the experiment, the fluorescence hologram was reconstructed with high fidelity at a 400 μm observation plane and the pump light hologram was reconstructed at a 150 mm far-field screen, verifying the feasibility of incoherent fluorescence holography.

[0041] Furthermore, by designing the nanobrick period, in the near field ( z =0 μm) to achieve binary intensity coding (Figure 6 left, NA≤0.25 viewing angle), generating high-resolution patterns such as "cherry blossoms" and "foxes" (resolution up to 12,700 dpi).x / y ) independent phase modulation degree of freedom, integrating dual fluorescent nano-printing channels, dual fluorescent Fresnel holographic channels ( z =450 μm, “PL” and “QD” icons) and dual-pump far-field holographic channel ( z =150 mm, “telescope” “microscope” pattern), as shown in Figure 6, the six-channel multi-dimensional meta-display was verified in the experiment, and the images of each channel had no crosstalk and could be triggered independently.

[0042] Through the experimental verification of Figures 1 to 6, the present invention achieves: 1. Waveguide mode selection enhances fluorescence coherence, breaking through the limitation of traditional incoherent light sources that cannot achieve precise wavefront modulation; 2. Incoherent fluorescence holography was realized using on-chip metasurfaces, and the multiplexing of incoherent fluorescence holography and pump light holography was achieved; 3. The integration of multi-dimensional meta-display of near-field fluorescent nanoprinting, fluorescent Fresnel holography and pump light far-field holography has been realized, which can support high-density optical information storage and display.

[0043] In addition, by replacing quantum dot materials (such as perovskite quantum dots) or adjusting the waveguide layer parameters, the present invention can be expanded to the ultraviolet-infrared band, making it suitable for fields such as programmable fluorescent emitters and optical anti-counterfeiting.

[0044] The above specific embodiments fully demonstrate the technical solutions and innovations of the present invention, and combined with the accompanying drawings, clearly present the preparation process of the luminescent metasurface and the multi-dimensional light field control effect.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A luminous metasurface, characterized in that: include: Optical waveguide structure layer: comprising a substrate and a waveguide layer located on the substrate, wherein the waveguide layer is used to guide the propagation of fluorescent light and pump light in the form of guided waves; Micro-nanostructure layer: arranged above the waveguide layer, composed of nanobricks, which are used to regulate the light in the form of waveguides; Fluorescence emission layer: located at a specific position above the micro-nanostructure layer, containing quantum dots, which are used to emit fluorescence under the excitation of pump light.

2. The luminescent metasurface according to claim 1, characterized in that: The micro-nano structure layer controls the emission angle and the emission wavefront of the radiated fluorescence and the scattered pump light by adjusting the parameters of the micro-nano structure.

3. The luminescent metasurface according to claim 2, characterized in that: The emission angle satisfies the wave vector matching condition.

4. The luminescent metasurface according to claim 1, wherein: The phase modulation of the micro-nanostructure layer adopts a method based on a circuitous phase and is determined by the relative displacement of the nanobricks relative to the periodic lattice.

5. The luminescent metasurface according to claim 1, wherein: The quantum dots in the fluorescence emission layer emit fluorescence under the excitation of a specific pump light, and the pump light and the fluorescence have different central wavelengths.

6. The luminescent metasurface according to claim 5, characterized in that: The waveguide layer performs guided mode selection on the fluorescent light emitted by the fluorescent light emitting layer.

7. A method for realizing incoherent fluorescence holography and multi-dimensional metadisplay based on the luminescent metasurface according to any one of claims 1 to 6, characterized in that: include: Using pump light to excite the quantum dots in the fluorescent emission layer to emit fluorescence; The spatiotemporal coherence of fluorescence is enhanced through the guided mode selection process of the waveguide layer; The unidirectional extraction and radiation of fluorescence is achieved by using a micro-nanostructure layer that meets the wave vector matching conditions, and the phase of the extracted fluorescence is modulated by a circuitous phase, so that the emitted fluorescence emits Fresnel diffraction in the diffraction process of free space; An optimization algorithm is used to optimize the phase distribution of the micro-nanostructure layer to generate a Fresnel hologram of incoherent fluorescence; The micro-nanostructure layer is used to independently regulate pump light and fluorescence in different dimensions to achieve a multi-dimensional meta-display including near-field and far-field. The multi-dimensional meta-display includes at least fluorescent nano-printing and holographic display functions.

8. The method according to claim 7, characterized in that The method further comprises: Control the period of superatoms in the micro-nanostructure layer to achieve fluorescent nanoprinting function; By utilizing the independent degrees of freedom of the micro-nanostructure layer to perform circuitous phase modulation of pump light and fluorescence in orthogonal directions, multi-channel display is achieved, including at least dual fluorescent nano-printing channels, dual fluorescent Fresnel hologram channels and dual pump light far-field hologram channels.

9. The use of the luminescent metasurface according to any one of claims 1 to 6, characterized in that: The luminescent metasurface is applied to prepare programmable fluorescent emitters, optical anti-counterfeiting, optical information encryption and storage, and next-generation multi-dimensional displays.

10. A method for preparing the luminescent metasurface according to claim 1, characterized in that: include: depositing a waveguide layer material on the substrate to form a waveguide layer; Prepare a micro-nanostructure layer on the waveguide layer and determine the structure and arrangement of superatoms; A fluorescent emission layer is prepared above the micro-nanostructure layer, and a material containing quantum dots is deposited at specific locations.

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