A programmable information metasurface device and method for polarization light control

Abstract

A programmable information metasurface device and method for polarized light control includes a base, a two-axis linear module is vertically arranged on the base, a shading plate is connected to the moving end of the two-axis linear module, a laser device for emitting polarized light is arranged on one side of the shading plate, a bracket is arranged on the other side of the shading plate, a metasurface structure is connected to the bracket, a trumpet-shaped light hole for ultraviolet light to pass through is opened in the center of the shading plate, and the two-axis linear module and the laser are controlled by a computer. The present invention can use polarized laser to achieve phase control of incident electromagnetic waves.

Description

Technical Field

[0001] The present invention relates to the field of novel artificial electromagnetic materials, and in particular to a programmable information metasurface device and method controlled by polarized light. Background Art

[0002] Metasurfaces are usually two-dimensional artificial micro / nano arrays composed of discrete electromagnetic scatterers with subwavelength sizes, and have excellent electromagnetic wave control capabilities. By designing the optical properties, geometric shapes, and spatial arrangements of metasurface structural units, the amplitude, phase, orbital angular momentum, and other parameters of the incident electromagnetic wave can be precisely controlled to achieve functions such as deflection, focusing, and wave absorption of electromagnetic energy. It has broad application value in military stealth, optical communications, display technology, and sensing. Information metasurfaces refer to metasurface materials used in information processing. They are cross-scientific products that combine information science, electrodynamics, and materials science. Usually, the incident electromagnetic field is controlled by regulating the unit structure represented by digital coding, which provides additional degrees of freedom in the time dimension, making it a nonlinear device without the need for nonlinear materials, thereby realizing a variety of information control functions, such as beamforming, holographic imaging, and spectrum selection.

[0003] Information metasurfaces have a wide range of applications in the fields of optics, communications, radar, sensing and laser technology, providing new possibilities for more efficient electromagnetic wave control and application. For example, field-programmable information metasurfaces mainly rely on FPGA or similar hardware circuits, and use binary codes to trigger different coding sequences to achieve dynamic control of incident electromagnetic signals. The basic principle is to use digital coding to characterize the metasurface by discretizing the electromagnetic parameters of its basic constituent units, combining metasurface physics with intelligent algorithms and information processing technologies. By arranging the coding units on a two-dimensional plane according to a pre-designed coding sequence, the state of each unit can be effectively controlled, and then the electromagnetic waves can be manipulated using the metasurface. At present, in addition to FPGA-controlled information metasurfaces, field-programmable control information metasurface devices of other technical paths are still very rare, and the development of new information metasurface technologies and devices is very urgent and necessary. Summary of the invention

[0004] Different from the current widely used method of using FPGA for digital encoding in information metasurfaces, the present invention provides a programmable information metasurface device and method for polarization light control, which can use polarized laser to achieve phase control of incident electromagnetic waves.

[0005] In order to solve the above problems, the technical solution of the present invention is:

[0006] A programmable information metasurface device for polarized light control comprises a base, a two-axis linear module is vertically arranged on the base, a shading plate is connected to the movable end of the two-axis linear module, a laser device for emitting polarized light is arranged on one side of the shading plate, a bracket is arranged on the other side of the shading plate, a metasurface structure is connected to the bracket, a trumpet-shaped light hole for ultraviolet light to pass through is opened in the center of the shading plate, and the two-axis linear module and the laser device are controlled by a computer.

[0007] The super surface structure comprises a transparent medium substrate, one side of the transparent medium substrate is a frosted surface, a photosensitive material is coated on the frosted surface, and a metal film is covered on the photosensitive material.

[0008] A method for a programmable information metasurface device controlled by polarization light, comprising the following steps:

[0009] The first step is to connect the laser device and the two-axis linear module to the computer, and set the wavelength and intensity of the ultraviolet light emitted by the laser device;

[0010] The second step is to control the two-axis linear module through a computer so that the ultraviolet light of the laser device is irradiated onto the photosensitive material through the light hole on the shading plate, and the irradiation time is at least 0.5 hours;

[0011] The third step is to repeat the operation of the second step until a resonator structure is formed, which can realize phase control of the incident electromagnetic wave.

[0012] The beneficial effects of the present invention are:

[0013] 1. The metasurface structural unit whose state has changed in the device can be restored to its original state after being irradiated with another polarized light, thereby achieving repeated programming and multiple uses.

[0014] 2. The metal film of the metasurface structure has good electrical conductivity and optical properties, and is preferably made of precious metals such as silver and gold, which can be used to adjust the transmission wavelength and enhance absorption.

[0015] 3. The shading plate selected in the present invention is close to the back of the metasurface, which can avoid strong diffraction effects.

[0016] 4. Use a two-axis slide table to allow the polarized laser to pass through the truncated cone-shaped light hole and irradiate the designated structural unit.

[0017] 5. The polarized laser emitted by the laser device can be used to transform the metasurface structure unit that is not irradiated by polarized light into the metasurface structure unit that is irradiated by polarized light. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings:

[0019] Figure 1It is a structural schematic diagram of the present invention,

[0020] Figure 2 is a schematic cross-sectional structure diagram of the super surface structure of the present invention,

[0021] Figure 3 is a side view of the super surface structure and the sunshade of the present invention,

[0022] Figure 4 is a cross-sectional view of the light-through hole on the light-shielding plate of the present invention,

[0023] Figure 5 This is a schematic diagram of the application of the metasurface of the present invention in adjusting the phase of an incident electromagnetic wave.

[0024] In the figure: base 1, bracket 2, light hole 3, shading plate 4, metasurface structure 5, laser equipment 6, two-axis linear module 7, computer 8, transparent medium substrate 51, photosensitive material 52, metal film 53, metasurface structure unit 54 not irradiated by polarized laser, and metasurface structure unit 55 after irradiated by polarized laser. DETAILED DESCRIPTION

[0025] like Figures 1 to 5 As shown, a programmable information metasurface device for polarized light control includes a base 1, a two-axis linear module 7 is vertically arranged on the base 1, a shading plate 4 is connected to the movable end of the two-axis linear module 7, a laser device 6 for emitting polarized light is provided on one side of the shading plate 4, a bracket 2 is provided on the other side of the shading plate 4, a metasurface structure 5 is connected to the bracket 2, a trumpet-shaped light hole 3 for ultraviolet light to pass through is opened in the center of the shading plate 4, and the two-axis linear module 7 and the laser device are controlled by a computer 8.

[0026] The super surface structure 5 includes a transparent medium substrate 51, one side of the transparent medium substrate 51 is sandblasted into a frosted surface, and a photosensitive material 52 is coated on the frosted surface. The unevenness of the frosted surface is used to accommodate more photosensitive materials 52. The photosensitive material 52 is a monoacrylate liquid crystal elastomer containing a chalcone intermediate, and a silver metal film 53 is covered on the photosensitive material 52. The thickness of the metal film 53 is 50 nanometers to 100 nanometers. The thickness of the shading plate 4 is less than 500 nanometers. The aperture of the circular hole in the trumpet-shaped light-through hole 3 facing the super surface structure 5 is 0.5 micrometers to 5 micrometers, and the aperture of the hole facing away from the super surface structure 5 is 1 micrometer to 10 micrometers.

[0027] A method for using a programmable information metasurface device controlled by polarization light comprises the following steps:

[0028] The first step is to connect the laser device 6 and the two-axis linear module 7 to the computer 8, and adjust the optical parameters of the laser device 6 to ultraviolet light with a wavelength of 365 nanometers and a light intensity of 80 milliwatts per square centimeter;

[0029] In the second step, the two-axis linear module is controlled by the computer 8 so that the ultraviolet light of the laser device 6 is irradiated to the structural unit of the liquid crystal elastomer in the photosensitive material 52 through the light hole 3 on the light shielding plate 4, and the irradiation time is at least 0.5 hours to ensure that the chalcone part undergoes a photodimerization reaction and realizes the state transformation;

[0030] The third step is to repeat the operation of the second step until a resonator structure is formed, which can realize phase control of the incident electromagnetic wave.

[0031] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A programmable information metasurface device controlled by polarization light, characterized in that: The invention comprises a base (1), on which a two-axis linear module (7) is vertically arranged, a shading plate (4) is connected to the movable end of the two-axis linear module (7), a laser device (6) for emitting polarized light is arranged on one side of the shading plate (4), a bracket (2) is arranged on the other side of the shading plate (4), a super surface structure (5) is connected to the bracket (2), a trumpet-shaped light-through hole (3) for ultraviolet light to pass through is opened in the center of the shading plate (4), the two-axis linear module (7) and the laser device are controlled by a computer (8), the super surface structure comprises a photosensitive material, and the photosensitive material is a monoacrylate liquid crystal elastomer containing a chalcone intermediate; ultraviolet light, i.e., polarized light, from the laser device is irradiated to the structural unit of the liquid crystal elastomer in the photosensitive material through the light-through hole on the shading plate, and the irradiation time is at least 0.5 hours to ensure that the chalcone part undergoes a photodimerization reaction and realizes a state transition.

2. The polarization-controlled programmable information metasurface device according to claim 1, characterized in that: The super surface structure (5) comprises a transparent medium substrate (51), one side of the transparent medium substrate (51) is a frosted surface, a photosensitive material (52) is coated on the frosted surface, and a metal film (53) is covered on the photosensitive material (52).

3. The polarization-controlled programmable information metasurface device according to claim 2, characterized in that: The thickness of the metal film (53) is 50 nanometers to 100 nanometers.

4. The polarization-controlled programmable information metasurface device according to claim 2, characterized in that: The thickness of the light shielding plate (4) is less than 500 nanometers.

5. The polarization-controlled programmable information metasurface device according to claim 2, characterized in that: The diameter of the circular hole in the trumpet-shaped light-through hole (3) facing the super-surface structure (5) is 0.5 micrometers to 5 micrometers, and the diameter of the circular hole facing away from the super-surface structure (5) is 1 micrometer to 10 micrometers.

6. A method for using the polarization light controlled programmable information metasurface device according to any one of claims 2 to 5, characterized in that: The steps include: The first step is to connect the laser device (6) and the two-axis linear module (7) to the computer (8), and set the wavelength and light intensity of the ultraviolet light emitted by the laser device (6); The second step is to control the two-axis linear module through the computer (8) so that the ultraviolet light of the laser device (6) is directed to the photosensitive material (52) through the light hole (3) on the light shielding plate (4) for at least 0.5 hours; The third step is to repeat the operation of the second step until a resonator structure is formed, which can realize phase control of the incident electromagnetic wave.

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