Construction method of multi-channel controllable nonlinear electromagnetic metasurface for b5g communication

Abstract

The application discloses a kind of multi-channel controllable nonlinear electromagnetic super-structure construction methods for B5G communication, for breaking symmetry to realize the case of directly exciting continuous domain bound state, determine the physical parameters including symmetry breaking degree, incident polarization state and material conductivity that affect nonlinear response;Based on the above physical parameters, on high resistance silicon substrate, set up symmetrical metal structure with broken section, obtain nonlinear electromagnetic super-structure that can produce several passbands;Based on the above nonlinear electromagnetic super-structure, using temperature-sensitive material to complete the broken section of metal structure, obtain adjustable nonlinear electromagnetic super-structure that can realize material conductivity change and affect symmetry breaking degree by temperature regulation, realize nonlinear response regulation based on super-structure continuous domain bound state.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nonlinear optical modulation, in particular to a multi-channel controllable nonlinear electromagnetic metasurface construction method for B5G communication. BACKGROUND

[0002] With the deployment of the fifth generation mobile communication technology (5G) facilities in various parts of the world, the Beyond 5G (B5G) mobile communication system has attracted more and more attention from researchers. Due to the need to provide high-quality communication services for industrial Internet, vehicle networking, Internet of Things and other platforms, B5G has more performance requirements than 5G, such as multi-service communication, high peak rate, high reliability, low delay, high energy efficiency and high connection density. At present, the transmission capacity, access capacity, energy efficiency and delay of 5G technology are still the main bottlenecks restricting the service performance and operation efficiency of the system, and it is urgent to research new transmission and access technologies to provide link support for future mobile network intelligent information services. In recent years, a large amount of related work has been carried out in the academic field around the above-mentioned needs and some progress has been made. The traditional wireless communication system (below 5G) cannot achieve terabit per second (Tbps) data rate, which stimulates the exploration of higher frequency bands, and the terahertz (THz) band (0.1-10 THz) has become a key technology to meet this requirement. The terahertz band has many advantages: terahertz super-speed wireless network can support 10 Gbps or even 1 Tbps data transmission rate; the terahertz band has a wide frequency band and most of it has not been allocated for use, which can carry Gbps of data and has a wide application prospect; and using the terahertz band for communication can effectively alleviate the increasingly tight spectrum resources and the capacity limitation of the current wireless system. High carrier frequency and large bandwidth are the prerequisites for B5G system to provide high-quality communication services, but the current high-efficiency large-bandwidth information transmission and processing technology, high-reliability low-latency large-scale access technology still faces many challenges, and its information theory basis also urgently needs in-depth thinking and exploration. In order to meet the strict requirements of the C-RAN architecture for optical fiber front communication capacity and delay for 5G / B5G communication, a new solution is needed, that is, to use a nonlinear electromagnetic metasurface to realize an independent high-efficiency multi-channel terahertz B5G communication system.

[0003] Nonlinear optics has unique advantages in frequency tuning, channel multiplexing and signal synchronization. With the rapid development of information technology, nonlinear optoelectronic devices have become one of the current research hotspots. The commonly used nonlinear optical media include optical thin films, crystals and amorphous substances. Nonlinear optical communication devices have the advantages of simple structure, small size, light weight, high information transmission efficiency and low communication cost. However, most nonlinear optical devices are restricted by intrinsic nonlinear polarizability, saturated absorption rate, dispersion and other factors, and cannot be completely designed and efficiently converted nonlinear electromagnetic response without the constraint of materials.

[0004] In recent years, nonlinear optical devices based on electromagnetic super-structured surfaces have attracted much attention because they can achieve multi-degree-of-freedom nonlinear electromagnetic response at subwavelength through simple unit structures. Among them, the magnetic dipole resonance caused by the unit structure provides a feasible path for efficient artificial nonlinearity due to its unique orthogonality and destructive interference phenomenon. By changing the frequency of the incident light to change the equivalent capacitance, the magnetic dipole resonance is realized, thereby realizing the artificial manipulation of nonlinear electromagnetic response in the degrees of wavelength, efficiency, etc. The local effect of the magnetic field can maintain high coupling efficiency and fast response rate in an open system, and enhance the nonlinear optical process on the surface of the structure.

[0005] Based on the above research background, how to realize the multi-channel terahertz B5G communication system composed of nonlinear electromagnetic super-structured surfaces, realize the customized nonlinear optical devices without the constraint of carrier materials, solve the problem that multiple channels in B5G communication cannot be independent of each other and the channel capacity cannot be further increased, and realize the efficient regulation of artificial nonlinear electromagnetic response in multiple degrees of freedom, these problems need to be solved. Research on how to obtain an independent and efficient multi-channel B5G communication system based on temperature-controlled super-structured surfaces and realize effective artificial regulation has great scientific and technological prospects and development value, and also conforms to the development trend of nonlinear electromagnetic super-structured surfaces, which will provide strong theoretical support for the design of novel nonlinear optical devices. SUMMARY

[0006] The application aims to overcome the deficiencies in the prior art and provide a multi-channel controllable nonlinear electromagnetic metasurface construction method for B5G communication.

[0007] The application is achieved by the following technical solutions:

[0008] The multi-channel controllable nonlinear electromagnetic metasurface construction method for B5G communication simulates the generation process of magnetic components and electric components through single base frequency and double base frequency electromagnetic resonance, substitutes into a Lorentz model to solve nonlinear polarization intensity, determines the physical process of generating artificial nonlinear response and the physical parameters affecting nonlinear response from the obtained nonlinear polarization intensity.

[0009] For the case of breaking symmetry to directly excite continuous domain bound states, the physical parameters affecting nonlinear response include the degree of symmetry breaking, incident polarization state and material conductivity; based on the above physical parameters, a symmetric metal structure with a broken section is arranged on a high-resistance silicon substrate to obtain a nonlinear electromagnetic metasurface capable of generating several passbands;

[0010] Based on the above nonlinear electromagnetic metasurface, a temperature-sensitive material is used to complete the broken section of the metal structure to obtain a tunable nonlinear electromagnetic metasurface capable of realizing material conductivity change and further affecting the degree of symmetry breaking through temperature regulation, thereby realizing nonlinear response regulation based on the continuous domain bound state of the metasurface.

[0011] Further, the metal structure is composed of a symmetrically arranged pair of open circular rings and a symmetrically arranged pair of circular arcs, the pair of open circular rings is located between the pair of circular arcs, one end of one of the circular arcs in the pair of circular arcs is provided with a broken section, and the symmetry lines of the pair of open circular rings and the pair of circular arcs are perpendicular to each other.

[0012] Further, the temperature-sensitive material is vanadium dioxide, which presents a low-conductivity dielectric state below 45 degrees Celsius and a high-conductivity metallic state above 70 degrees Celsius, and the conductivity of vanadium dioxide can change in the range of 10~10E5.

[0013] The application also provides an application of an adjustable nonlinear electromagnetic superstructure surface, based on the multi-channel adjustable nonlinear electromagnetic superstructure surface construction method for B5G communication, the adjustable nonlinear electromagnetic superstructure surface can realize transmittance regulation under artificial temperature control, and the adjustable nonlinear electromagnetic superstructure surface is fused into a mode group multiplexing system to develop a B5G-oriented mode group multiplexing terahertz communication system.

[0014] Compared with the prior art, the technical scheme of the application has the beneficial effects that:

[0015] 1. The nonlinear electromagnetic superstructure surface designed in the application is composed of a symmetric open circular ring pair and a symmetric circular arc pair, under the action of an electromagnetic wave polarized in the y direction, the interaction between the damaged circular arc pair and the open circular ring produces multiple narrow passbands. By using a temperature-sensitive material to complete the damage of the circular arc pair, the change of the material conductivity is realized by temperature regulation.

[0016] 2. The adjustable nonlinear electromagnetic superstructure surface can realize efficient transmittance regulation under artificial temperature control. The nonlinear electromagnetic superstructure surface obtained by design can be fused into a mode group multiplexing system to develop a B5G-oriented mode group multiplexing terahertz communication new system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a flowchart of the application and an implementation target flowchart.

[0018] Figure 2 is a structure diagram of the metal and vanadium dioxide structure in the nonlinear electromagnetic superstructure surface.

[0019] Figure 3 is the transmittance of the nonlinear electromagnetic superstructure surface to different frequency terahertz signals at different working temperatures.

[0020] Figure 4 is the transmittance of the nonlinear electromagnetic superstructure surface under different degrees of symmetry damage. DETAILED DESCRIPTION

[0021] The application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0022] As Figure 1As shown, the embodiment provides a multi-channel controllable nonlinear electromagnetic superstructure surface construction method for B5G communication. The generation process of magnetic components and electric components is simulated through single base frequency and double base frequency electromagnetic resonance. The nonlinear polarization intensity is solved by substituting into the Lorentz model. The physical process of generating artificial nonlinear response and the physical parameters affecting nonlinear response are determined from the obtained nonlinear polarization intensity. The above process is related in the patent application "CN202110424386, multi-channel controllable nonlinear electromagnetic superstructure surface construction method for B5G communication".

[0023] From the above, for the case of breaking symmetry to realize direct excitation of continuous domain bound states, the physical parameters affecting nonlinear response include the degree of symmetry breaking, the incident polarization state, and the material conductivity.

[0024] Based on the above physical parameters affecting nonlinear response, in the embodiment, a symmetric metal structure with a broken section is arranged on a high-resistance silicon substrate. See Figure 2 In the embodiment, the metal structure is made of aluminum, but other metals such as gold, silver, and copper can also be used. The metal structure is composed of a pair of symmetrically arranged open circular rings and a pair of symmetrically arranged circular arcs. The open circular ring pair is located between the circular arc pair. One end of one of the circular arcs in the circular arc pair is provided with a broken section. Under the action of electromagnetic waves polarized in the y direction, the symmetric circular arc pair with a broken section and the symmetric open circular ring pair interact to produce multiple narrow passbands.

[0025] Specifically, the symmetry lines of the open circular ring pair and the symmetry lines of the circular arc pair are perpendicular to each other. In the embodiment, the open circular ring is obtained by providing openings on a circular aluminum metal. The openings of the two open circular rings are opposite and symmetrically arranged based on a symmetry line.

[0026] The broken section of the circular arc in the metal structure is completed using a temperature-sensitive material to obtain a tunable nonlinear electromagnetic superstructure surface that can change the material conductivity and further affect the degree of symmetry breaking through temperature control. This realizes the excitation of nonlinear electromagnetic signals and independent and efficient multi-channel control effect, and finally realizes the nonlinear response control based on the superstructure continuous domain bound state.

[0027] In the embodiment, the temperature-sensitive material is vanadium dioxide. Vanadium dioxide exhibits a low-conductivity dielectric state below 45 degrees Celsius and a high-conductivity metallic state above 70 degrees Celsius. The change in material conductivity can reach a range of 10~10E5.

[0028] The above tunable nonlinear electromagnetic superstructure surface can realize efficient transmittance control under artificial temperature control. It can be integrated into a mode group multiplexing system to develop a new terahertz communication system for B5G mode group multiplexing.

[0029] Figure 3In the specific embodiments, the transmittance of the nonlinear electromagnetic superstructure surface to signals of 0.4 THz to 1 THz at different working temperatures, the influence of the material conductivity on the nonlinear response is proved, and it is proved that the nonlinear electromagnetic superstructure surface in the specific embodiments realizes efficient terahertz channel regulation effect near 0.68 THz and 0.82 THz.

[0030] Figure 4 In the specific embodiments, the transmittance of the nonlinear electromagnetic superstructure surface at different degrees of symmetry breaking, further proving that the degree of symmetry breaking is an important physical parameter affecting the nonlinear response.

[0031] The present application is not limited to the above-described embodiments. The above description of the specific embodiments is intended to describe and illustrate the technical solutions of the present application, and the specific embodiments described above are merely illustrative and not restrictive. Without departing from the purpose of the present application and the scope protected by the claims, those skilled in the art can make many forms of specific changes under the inspiration of the present application, which are all within the protection scope of the present application.

Claims

1. A method for constructing a multi-channel controllable nonlinear electromagnetic metasurface for B5G communication, which simulates the generation process of magnetic and electric components by single and double base frequency electromagnetic resonance, substitutes into the Lorentz model to solve nonlinear polarization intensity, and determines the physical process of generating artificial nonlinear response and the physical parameters affecting nonlinear response from the obtained nonlinear polarization intensity; characterized in that, for the case of breaking symmetry to directly excite continuous domain bound states, the physical parameters affecting nonlinear response include the degree of symmetry breaking, the incident polarization state and the material conductivity; based on the above physical parameters, a symmetric metal structure with a broken section is set on a high-resistance silicon substrate to obtain a nonlinear electromagnetic metasurface capable of generating several passbands; based on the above nonlinear electromagnetic metasurface, a temperature-sensitive material is used to complete the broken section of the metal structure to obtain a controllable nonlinear electromagnetic metasurface that can change the material conductivity and affect the degree of symmetry breaking through temperature control, thereby realizing nonlinear response control based on metasurface continuous domain bound states; the metal structure is composed of a symmetrically arranged pair of open circular rings and a symmetrically arranged pair of circular arcs, the pair of open circular rings is located between the pair of circular arcs, one end of one of the circular arcs in the pair of circular arcs is provided with a broken section, and the symmetry lines of the pair of open circular rings and the pair of circular arcs are perpendicular to each other. The temperature-sensitive material is vanadium dioxide, which presents a low-conductivity dielectric state below 45 degrees Celsius and a high-conductivity metallic state above 70 degrees Celsius, and the conductivity of vanadium dioxide can change by a factor of 10~10E5. 3.A method for using a controllable nonlinear electromagnetic metasurface, based on the method for constructing a multi-channel controllable nonlinear electromagnetic metasurface for B5G communication according to any one of claims 1-2, the controllable nonlinear electromagnetic metasurface can realize transmittance control under artificial temperature control, and the controllable nonlinear electromagnetic metasurface is fused into a mode group multiplexing system to develop a terahertz communication system for B5G mode group multiplexing.

2. The method of claim 1, wherein the method is configured to be used for B5G communication. ​ ​

Images