57 results about "Wave vector" patented technology

The invention discloses a wide temperature range compensation method for resistive current of a lightning arrester, which belongs to the technical field of online monitoring of power equipment, and comprises the following steps: acquiring waveform data under a reference low-temperature working condition, and establishing an initial capacitive harmonic base; acquiring working condition data at any temperature in real time, performing harmonic decomposition, and analyzing to generate a nonlinear distortion feature vector; dynamically correcting the initial base by using the feature vector, and carrying out subtraction operation on the total current harmonic wave to obtain a final resistive current harmonic wave vector; and reconstructing an instantaneous resistive current waveform through inverse transformation and calculating a characteristic value. According to the technical scheme, the initial capacitive harmonic wave base is established, the nonlinear distortion feature vector is generated based on the harmonic distortion of the real-time working condition quantification temperature and valve plate nonlinear coupling, and dynamic feedback correction is conducted on the base, so that the real resistive current waveform in the wide temperature range can be accurately separated and reconstructed, and the accuracy of the real resistive current waveform in the wide temperature range is improved. And the accuracy and reliability of lightning arrester state evaluation are improved.

The invention belongs to the technical field related to structure optimization design, and discloses a topological optimization method and device for a metamaterial microstructure capable of bearing a band gap, and the method comprises the steps: (1) respectively defining an interpolation penalty coefficient of a Young modulus for the homogenization analysis of the microstructure and the band gap problem of an energy band structure according to the performance analysis of the microstructure, calculating an interpolation penalty coefficient of the mass density; (2) carrying out homogenization analysis of the microstructure based on dynamics to obtain equivalent physical property parameters and determine equivalent material modulus; (3) defining an irreducible first Brillouin region wave vector path of the microstructure based on the geometric symmetry constraint of the microstructure, and further calculating a band gap quality factor between adjacent energy band curves of the microstructure; and (4) establishing a topological optimization model which takes the equivalent modulus as a grading constraint and takes band gap quality factor maximization as a target, and performing iterative optimization based on the topological optimization model to obtain an optimal microstructure configuration. According to the invention, efficient and stable design of the microstructure is realized.

The invention discloses a tunable band elimination filter based on a quantum well structure photon time crystal and a method. The tunable band elimination filter comprises the quantum well structure photon time crystal; the quantum well structure photon time crystal comprises a first photon time crystal section, a time domain quantum well section and a second photon time crystal section which are connected in sequence; when an electromagnetic signal is propagated, the electromagnetic signal sequentially passes through the first photon time crystal section, the time domain quantum well section and the second photon time crystal section, so that a stable band gap region and a controllable resonance response are formed in a momentum space; a fitting relation between a local state equivalent wave vector and a time structure parameter is established by adjusting a time section proportion parameter and a refractive index contrast ratio in a quantum well structure photon time crystal, so that the local state quantity and momentum position of an electromagnetic signal are regulated and controlled; and frequency spectrum regulation of the electromagnetic signal is realized through a corresponding relation between the momentum space and the frequency domain space. The frequency spectrum regulation and control precision and the system stability are improved.

This application provides a wavefield decomposition method, apparatus, device, and medium based on wavefront phase direction, belonging to the field of geophysical exploration technology. The method includes: determining a wavefield decomposition operator based on the original wavefield and Thomsen parameters; the wavefield decomposition operator is a first-order pseudo-Helmholtz decomposition operator based on the wavefront phase direction; determining the wavenumber domain wavefield obtained after transforming the original wavefield to the wavenumber domain; performing computational processing based on the wavenumber domain wavefield and wavenumber, followed by inverse Fourier transform to obtain multiple intermediate quantities constituting an auxiliary wavefield; determining the auxiliary wavefield based on the multiple intermediate quantities and Thomsen parameters through an auxiliary wavefield expression; and performing wavefield decomposition based on anisotropic wavefield decomposition formula to achieve P-wave and S-wave separation, obtaining the P-wave and S-wave wavefields. This method not only achieves P-wave and S-wave vector wavefield separation and reduces imaging crosstalk noise, but also reduces computational load, balancing wavefield decomposition effect and computational efficiency.

The invention relates to a device for non-destructive testing of mechanical parts made of polycrystalline material, said device comprising: - an ultrasonic probe (1) comprising a two-dimensional array of transducers capable of transmitting and receiving signals at different excitation angles, and - a processing module (2) adapted to control the transmission and reception of the transducers, to process the signals received by the transducers so as to express the signals received by the ultrasonic probe in two plane wave planes constituted by the transmission and reception wave vectors of the probe, and to derive therefrom information representative of the three-dimensional orientation of the fibrous structure of the mechanical part.

The invention discloses a tetramer refractive index sensor based on continuous domain bound states (BICs) and a manufacturing method of the tetramer refractive index sensor. The sensor comprises a silicon dioxide substrate and tetramer unit cells distributed on the upper surface of the substrate in an array mode. The tetramer unit cell comprises four positive polygonal cylinders which are identical in size, the positive polygonal cylinders are perpendicular to the silicon dioxide substrate, and the positive polygonal cylinders are arranged in a matrix mode and rotate by an angle theta towards the center of the unit cell. Along with the change of theta, the metasurface unit cell is converted from a monomer to a tetramer and then converted from the tetramer to the monomer, so that energy band folding is induced in a wave vector space, and then the high-Q-value BICs metasurface with the Q value insensitive to the rotation angle is excited. The refractive index sensor also has the characteristic of high refractive index sensing sensitivity, and the detection efficiency, flexibility and accuracy of the refractive index sensor in the biomedical field are improved.

A method for calculating a band gap of a built-in harmonic oscillator periodic structure of a hollow pipe pile comprises the steps that a hollow pipe pile body, a soil body and a harmonic oscillator coordinate system are divided through regional decomposition, and a unit cell structure total constraint condition matrix composed of a periodic boundary constraint condition matrix and a pile-soil contact interface constraint condition matrix is established; processing the unit cell structure total constraint condition matrix through a linear expression method to obtain a basic solution set; establishing a unit cell structure total energy functional and a motion equation of the unit cell structure according to the basic solution system set, and scanning the wave number of the first Brillouin region to obtain a vibration frequency dispersion curve of a built-in harmonic oscillator periodic structure of the hollow pipe pile; and analyzing the corresponding relationship between the wave vector and the frequency of the periodic pile-in-row structure to obtain the band gap characteristics of the periodic structure of the built-in harmonic oscillator of the hollow pipe pile. According to the method, the pile-soil parameter distortion problem and the boundary dependence problem in shape function construction are avoided, so that the method for calculating the band gap of the built-in harmonic oscillator periodic structure of the hollow pipe pile is provided, the calculation implementation complexity is low, and the calculation result is accurate.

The application provides a flow field reconstruction and deduction method based on K-A theorem, and belongs to the technical field of ship hydrodynamics. First, multi-dimensional data such as the direction, amplitude, period, frequency and flow velocity of irregular waves are collected and integrated into high-dimensional wave vectors. Then, the KAN network with B-spline curve as a learnable function is used to map the high-dimensional input into a low-dimensional parameter list, obtain the amplitude, angular frequency and initial phase of the dominant equivalent regular wave, calculate the decoupling target function by constructing an equivalent wave superposition model, compare the decoupling target function with the true value to obtain a loss function, and then optimize the network parameters by backward propagation until convergence. Finally, based on the network output parameters, a wave superposition model is constructed to represent the real wave in the form of a series of interpretable regular waves superimposed in time sequence, so that efficient and accurate flow field reconstruction and deduction are realized.

Embodiments of the present application propose an imaging system based on super-Raleigh limit focusing lens and its application, which can be widely applied in the technical fields of photolithography, biomedical, optical imaging and nanometer structure precision measurement; the system can produce transverse wave vector distribution and excitation and detection vector beams with wave vector range meeting the requirements by wave vector ring modulation on incident linearly polarized light, focus the vector beams to make the focusing field meet the scale requirements, so as to obtain super-Raleigh limit excitation PSF and detection PSF, and obtain a confocal PSF capable of exciting high-order terms of spot intensity by superimposing the excitation and detection PSFs, thereby improving the imaging resolution of the system; on the other hand, the system can use solid and hollow focusing spots formed by focusing vector beams to form an image, and calculate according to the imaging result to reduce interference, so as to obtain a high-resolution detection result far exceeding the Raleigh diffraction limit, and further improve the resolution of the imaging system.

The invention discloses a one-dimensional ternary structure photonic crystal biological detection sensor and application, and relates to the technical field of sensors. According to the one-dimensional ternary structure photonic crystal biological detection sensor, at least three unit cells, a first defect structure and at least three unit cells are sequentially arranged in the direction from an incident wave vector to an emergent wave vector, and the number of the unit cells located on the two sides of the first defect structure is the same; a first graphene layer, a middle layer and a second graphene layer are sequentially arranged in each unit cell, and the first defect structure comprises a detection layer; the one-dimensional ternary structure photonic crystal biological detection sensor further comprises a second defect structure. The one-dimensional ternary structure photonic crystal biological detection sensor can realize a refractive index sensing function in an omnidirectional photonic forbidden band, is good in transmission performance, wide in detection range and high in detection fault tolerance, can realize different types of sensing effects at different temperatures, has more functions, is relatively low in cost, and is suitable for more application scenes.

The application discloses a full-wavelength limit resolution structured light microscopic imaging method and related products, which can be applied to the technical field of optical microscopes. The method comprises the following steps: determining a target fringe period of a structured light illumination fringe based on an emission wavelength; adjusting the structured light illumination fringe to the target fringe period based on a spatial light modulator, so that a structured light microscopic imaging system reaches full-wavelength limit resolution; acquiring a first frequency domain image, a second frequency domain image and a third frequency domain image corresponding to a target sample based on the structured light illumination fringe; processing the first frequency domain image, the second frequency domain image and the third frequency domain image based on a frequency domain image multiplication algorithm, and determining a target wave vector; and performing image reconstruction on the target sample based on the target wave vector. In this way, the system maintains the limit resolution at any emission wavelength through the adjustment of the spatial light modulator, and then the frequency domain image multiplication algorithm accurately solves the target wave vector under the condition, thereby improving the accuracy of image reconstruction.

The invention discloses an electromagnetic pulse propagation calculation method based on a generalized propagation matrix and a transfer function method, and the method comprises the steps: determining the explosion point height and the receiving point height of an electromagnetic pulse, and constructing an ionosphere parameter on a propagation path; calculating a wave vector of the position of an electromagnetic pulse explosion point, and calculating a reflection coefficient matrix and a transmission coefficient matrix of the electromagnetic pulse which upwards penetrates through the ionized layer and downwards radiates to the ground through a generalized propagation matrix method; defining the type of the electromagnetic pulse, and calculating the amplitude of the superposed uplink and downlink electromagnetic waves at the explosion point position through the reflection coefficient matrix; in combination with a generalized propagation matrix method and a transfer function method, calculating the frequency spectrum and time domain waveform of the electromagnetic wave penetrating through the ionosphere at the explosion point position through inverse Fourier transform; time-frequency characteristic analysis is carried out according to the frequency spectrum and the time-domain waveform of the electromagnetic waves penetrating through the ionosphere, a time-frequency graph is obtained, the experiment cost is remarkably reduced, and efficient and low-cost theoretical support is provided for propagation of the electromagnetic pulses in the ionosphere.

The application discloses a near-field equivalent method, a mask 3D near-field correction method and a storage medium. The optical near-field equivalent method comprises the following steps: setting a three-axis coordinate system, so that the initial propagation direction of a light source with a preset angle is propagated along a first axis, and an initial wave vector and a polarization direction are obtained; performing a rotation operation on the initial wave vector and the polarization direction according to the preset angle of the light source; analyzing the polarization direction and the polarization vector of the light source after the rotation operation; rotating the polygon and the light source according to the preset angle of the polygon, so that a new wave vector and a corresponding rotation angle are obtained; analyzing the polarization direction, the polarization vector and the component of the light source after the second rotation operation; generating an edge near-field under equivalent conditions by using a 2D strict electromagnetism algorithm; and performing linear superposition according to the respective components based on the polarization direction of the light source after the second rotation operation, so that an equivalent near-field result is obtained. The application reduces the calculation burden of near-field generation.

An integrated electro-optical non-reciprocal mode converter based on birefringent crystal refractive index matching comprises a chip, the upper layer of the chip is an electro-optical material film with birefringent characteristics, a mode converter is prepared on the electro-optical material film, and the mode converter is a two-port device; the first port is used for receiving an input optical signal of a mode 1 and allowing the optical signal to enter the mode converter; and the second port is used for outputting the converted optical signal in the mode 2. The refractive index difference of a birefringent material to a transverse electric mode (TE) and a transverse magnetic mode (TM) is utilized to realize the pre-coarse matching of the refractive indexes of TE and TM modes, and then the fine matching of the refractive indexes and wave vectors is realized in combination with electro-optical modulation, so that the integrated electro-optical mode converter insensitive to the process is realized. The device is simple in structure and has a wide application prospect.

The invention discloses a holographic two-dimensional grating exposure method and device and an exposure beam calculation method, and relates to the technical field of holographic two-dimensional gratings, and the exposure beam calculation method comprises the steps: determining wave vectors k1 and k2 of an exposure beam of a first three-dimensional grating vector KG1 according to the first three-dimensional grating vector KG1 and a second three-dimensional grating vector KG2, the wave vector k1 is the wave vector of the common exposure light beam of the three-dimensional grating vector I KG1 and the three-dimensional grating vector II KG2, introducing a tilt vector and constructing a vector triangle to carry out rotation iterative calculation, so as to obtain a three-dimensional grating vector I KG1 and a three-dimensional grating vector II KG2, and the wave vector k1 is the wave vector of the common exposure light beam of the three-dimensional grating vector II KG2; the exposure method and the exposure device are set according to the parameters of the exposure light beams obtained by the calculation method, so that the problem that the operation difficulty is high due to the fact that the two paths of light beams are needed to carry out exposure for multiple times when the holographic two-dimensional grating is manufactured is solved.

The application belongs to the technical field of photonic artificial micro-nano structure design and image processing, and discloses an optical spatial differential device for target extraction, a reverse design method and application. The method comprises the following steps: setting a target transfer function according to the functional requirement of an optical device; establishing an optimization model according to the design parameters of a super surface, the design parameters being dielectric constant distribution, and performing certain constraint and binary processing on the design parameters in each iteration process; judging whether the loss function converges or not, outputting an optimization scheme if the loss function converges, and otherwise, performing gradient calculation and continuing the next iteration optimization process. The optical spatial differential device is based on the diffraction optical angular spectrum theory and the Fourier transform property, directly acts on an incident light field image, realizes spatial frequency regulation of the light field image in the wave vector space, and thus achieves the purpose of processing the image in the optical domain. The obtained patterns of the application can be directly applied to a double photopolymerization 3D printing technology, so as to prepare a sample.

The application belongs to the technical field of seismic exploration, and specifically discloses an elastic wave vector seismic exploration data static correction method, which comprises the following steps: S1, establishing a P-wave micro-logging surface velocity model; S2, establishing a three-component micro-logging S-wave surface velocity model; S3, performing low-frequency static correction on P-wave seismic data; S4, performing low-frequency static correction on S-wave seismic data; S5, performing low-frequency static correction on converted wave seismic data; S6, calculating the shot point and geophone residual static correction amount of P-wave wave field, converted wave wave field and S-wave wave field; and S7, calculating the total static correction amount of the shot point and geophone of the P-wave wave field, converted wave wave field and S-wave wave field. The application effectively solves the static correction problem of various wave field seismic data in elastic wave vector seismic exploration, improves the calculation efficiency and imaging accuracy, and is suitable for the static correction of seismic exploration data.

The application discloses a frequency-shifted label-free far-field super-resolution optical wide-field microscopic imaging method, which is based on large-area uniform high-frequency body plasmon (BPPs) mode field excited by metal / dielectric multilayer film structure material to perform frequency-shifted illumination on a sample, a plurality of images containing low-frequency and high-frequency information of the sample are obtained by adjusting an illumination wave vector, a series of picture intensity distributions with some overlaps in a frequency domain space are iteratively spliced, a spatial spectrum of the object covering a maximum detectable wave vector range is obtained, and finally a super-resolution label-free sample microscopic image is reconstructed by inverse Fourier transform. The application has the advantages of novel principle, simple structure, easy operation, wide working bandwidth, high efficiency, low cost and the like, and opens up a new idea for realizing higher-quality label-free optical microscopic imaging.

The invention relates to the technical field of cable circulation monitoring, in particular to a high-voltage cable circulation monitoring method and system. The method comprises the following steps: determining a load step triggering moment and a corresponding low-load current fundamental wave vector group and a corresponding high-load current fundamental wave vector group; constructing an induced voltage deviation objective function based on the difference of the two vector groups, and iteratively determining an optimal mutual inductance coefficient vector; performing induced voltage reconstruction on the high-load current fundamental wave vector group by using the optimal mutual inductance coefficient vector, and determining a sheath loop impedance parameter based on a vector relationship between the reconstructed voltage and three-phase sheath loop current data; determining a voltage model calculation deviation degree based on the difference between the reconstruction voltage and the inversion impedance voltage drop; and the operation state of the high-voltage cable is determined. According to the method, the deviation degree and the sheath loop impedance parameter representing the conductivity of electrical connection are calculated by combining the voltage model representing the integrity of the circuit topology, and an inherent structure fault and a real resistive fault are effectively distinguished.

This invention discloses a continuous terahertz wave radiation source based on optical parametric oscillation in a waveguide cavity, its usage method, and its fabrication method, belonging to the field of optical communication technology. The continuous terahertz parametric oscillation radiation source includes a nonlinear dielectric waveguide layer and a substrate waveguide layer disposed on the upper and lower surfaces of the nonlinear dielectric waveguide layer. Reflective films are disposed on two opposite sides of the nonlinear dielectric waveguide layer to form a waveguide cavity within the nonlinear dielectric waveguide layer. The thickness and width of the nonlinear dielectric waveguide layer both satisfy the wave vector matching condition, and the thickness of the nonlinear dielectric waveguide layer is 5~50 μm. By obtaining a large nonlinear coupling coefficient, a small terahertz propagation loss, and achieving wave vector matching, the continuous terahertz wave radiation source provided by this invention can achieve high terahertz conversion efficiency, the waveguide cavity has a high quality factor, enhances the effective field strength within the nonlinear dielectric waveguide layer, and significantly reduces the terahertz parametric oscillation threshold.

The invention discloses a coarse grain weld anisotropic elastic coefficient measuring method and system based on a water immersion penetration ultrasonic method. According to the invention, an elastic coefficient inversion system is constructed by adopting a forward modeling and inversion optimization method. Firstly, based on an elastic wave dynamics theory, a forward modeling calculation model from an elastic coefficient to a macroscopic ultrasonic propagation behavior is established; solving a Christoffel equation to obtain theoretical group velocities corresponding to different wave vector directions which change continuously; secondly, according to weld joint propagation paths of ultrasonic waves under different wave vectors, calculating theoretical flight time of the ultrasonic waves in a weld joint; then, actual flight time of different wave vector directions in the welding seam is obtained through a water immersion ultrasonic penetration method experimental device, finally, a fitness function is established by adopting an accelerated particle swarm optimization inversion algorithm, and rapid and accurate measurement of the anisotropic elastic coefficient of the welding seam is achieved by minimizing the fitness function.

The application discloses a deep-shift frequency super-resolution microscopic chip based on a nonlinear evanescent field and an imaging method thereof, and belongs to the field of shift frequency super-resolution microscopic imaging. The deep-shift frequency super-resolution imaging chip comprises, from bottom to top, a substrate layer, a nonlinear optical material film layer, a surface plasmon film system and a microstructure layer which are sequentially stacked. A polygonal hole slot is entirely provided in the central region of the surface plasmon film system and the microstructure layer, and the exposed part of the nonlinear optical material film layer serves as an imaging sample placement area. A plurality of groups of microstructures are engraved on the upper surface of the microstructure layer around the polygonal hole slot. The application utilizes the nonlinear four-wave mixing effect to excite, control and enhance the super-large wave vector evanescent field and applies the super-large wave vector evanescent field to shift frequency super-resolution imaging, solves the problem that the wave vector of the evanescent field provided by a natural waveguide material is limited and the larger the wave vector is, the weaker the signal is, and breaks through the resolution upper limit of the existing linear shift frequency super-resolution imaging technology under the premise of ensuring the imaging quality.

The invention relates to an acousto-optic tunable filter (Acoustical-optical tunable filter-AOTF), which is an electrically controlled tunable spectrum light splitting device, and is characterized in that the acousto-optic tunable filter (Acoustical-optical tunable filter-AOTF) is an electrically controlled tunable spectrum light splitting device. In a complex task, single-band information is often insufficient to support a decision, so that the invention provides a design method of a single transducer-dual-band acousto-optic tunable filter, a numerical calculation model is established through a dual-band wave vector geometry principle, and a dual-band tuning relationship under different cutting types is obtained. And furthermore, the design of the dual-band AOTF device with high diffraction efficiency and low power consumption is realized through the size optimization design of the transducer. Compared with an existing AOTF device design method, the single-transducer-dual-waveband AOTF device design method can utilize a single simple single-transducer AOTF device to obtain dual-waveband spectral data at the same time, the spectral range is expanded, the spectral detection efficiency is improved, and the detection capacity for a dynamic target is improved. Meanwhile, the dual-band detection can reduce the frequency of electrical power loading of the transducer, the thermal load of the device is reduced, and the working stability of the device is improved.

The application relates to an optical nano antenna, in particular to a multi-wavelength one-way scattering optical nano antenna based on a gallium phosphide arrowhead type, wherein the multi-wavelength one-way scattering optical nano antenna is an arrowhead type nano antenna, the material of the arrowhead type nano antenna is gallium phosphide, the included angle a of the arrowhead type nano antenna is 15 DEG, the length of two sides of the arrowhead G is 303 nm, the width of the arrow tail M is 40 nm, the length of the arrow tail L is 100 nm, the thickness H of the arrowhead type nano antenna is 420 nm, the background refractive index of the arrowhead type nano antenna is a constant 1, the incident light of the arrowhead type nano antenna is a plane wave, the wave vector is parallel to the z-axis direction, and the polarization is parallel to the x-axis direction. The nano antenna is composed of the arrowhead type of the high-refractive-index material gallium phosphide, under the excitation of the incident plane wave, the wave vector is parallel to the z-axis direction, and the polarization is parallel to the x-axis direction. The structure is a structure capable of supporting electric resonance and magnetic resonance.

The invention belongs to the technical field of terahertz, and particularly relates to a tunable terahertz generation method based on a physical driving generative adversarial network and a topological metasurface, and the method comprises the steps: constructing a heterogeneous integrated topological metasurface unit comprising thin-film lithium niobate, an arrayed nano antenna, tungsten disulfide and a graphene layer; a physical driving generative adversarial network is utilized, Maxwell equation set constraints are introduced into a loss function, and a topological structure sequence meeting wave vector matching conditions is reversely designed; infrared laser is adopted as a pumping source, a difference frequency generation effect is utilized to excite the metasurface, and a continuous domain bound state effect is combined to enhance the local field intensity, so that high-power and continuously adjustable-frequency terahertz waves are generated. The terahertz full-band high-efficiency conversion and ultra-fast dynamic tuning are realized, the output power and the light beam quality are remarkably improved, and the physical feasibility of a design result is ensured.

A computer-implemented method for generating a spectral model representation of an electromagnetic element for determining an electromagnetic response to electromagnetic radiation interacting with the electromagnetic element is presented. The spectral representation contains a two-dimensional array of elements corresponding to respective wave vectors, each of which is defined by (different) respective pairs of wave numbers in two directions transverse to each other. The electromagnetic elements are geometrically described as a plurality of slices stacked transversely to these directions, and each slice contains one or more polygons. The method includes determining points along each of the polygon edges, a calculation coefficient being calculated based on a range of the corresponding polygon edge in a lateral direction. By performing a fast Fourier transform (FFT) algorithm using the coefficients, Fourier components are generated in each of the lateral directions for each of the wave vectors.

This invention provides a multi-channel three-dimensional quasi-phase matching method and apparatus. The method includes: focusing fundamental frequency light through a microscope objective to obtain fundamental frequency light with a modified focusing state; incident the modified fundamental frequency light onto a nonlinear photonic crystal via normal incidence, and obtaining an outgoing second harmonic through the nonlinear photonic crystal; and finally, outputting multi-channel frequency-doubled light waves based on the outgoing second harmonic. This invention focuses fundamental frequency light onto a nonlinear photonic crystal via a microscope objective, changing the direction range of the incident fundamental frequency wave vector simply by altering the numerical aperture of the focusing objective. Combined with the spatial reciprocal lattice vector combination of the three-dimensional nonlinear photonic crystal, the quasi-phase matching condition is satisfied, achieving variable multi-channel frequency doubling. This invention achieves controllable multi-channel second harmonic generation without structural changes.

The application discloses a preparation method of a frequency band magnetic control adjustable aerogel-based wave-absorbing material. First, ferromagnetic iron-cobalt nanosheets are obtained through a liquid phase reduction method, and then the nanosheets are ultrasonically mixed and dispersed with graphene oxide. The mixed system is subjected to a hydrothermal reaction to obtain a composite hydrogel precursor. After freeze-drying, a graphene aerogel-based composite wave-absorbing structure is obtained, wherein the ferromagnetic nanosheets exist in the hollow skeleton structure of the aerogel. The precursor aerogel structure is quickly immersed in a sodium alginate solution, and a hydrogel medium is formed in the structure by adding calcium ions, so that the nanosheets are suspended in the hollow skeleton of the aerogel, and an adjustable composite wave-absorbing material is obtained. By applying an external magnetic field at different angles, the nanosheets are oriented in the hollow skeleton. By changing the angle between the interface dielectric dipole array and the easy magnetization magnetic moment and the electromagnetic wave vector, respectively, the microwave electromagnetic parameters and the impedance of the material are dynamically adjusted, so that the real-time dynamic adjustment of the wave-absorbing performance and the absorption frequency band is realized.

The application discloses a surface electromagnetic wave wave-absorbing structure matched with wave vectors and impedance, and is applied to the surface of an aircraft. The structure is a three-layer stacked three-dimensional structure. The bottom layer is a full-coverage reflecting layer. The middle layer is a flexible material medium substrate. The top layer is a plurality of resistance film resonant metal units. The structure solves the problem of surface wave suppression by only relying on a physical mechanism, and can realize surface wave regulation and attenuation, and has the characteristics of a wide frequency band, ultra-thinness, light weight and conformality.

The invention relates to a method for constructing hyperbolic polaritons by using phonon engineering regulation and control. The method comprises the following steps: providing a crystal substrate; providing an atomic layered material with anisotropic phonon response; the atomic layered material is placed on the surface of a crystal substrate, and the isotropic circular phonon polaritons on the surface of the crystal substrate are topologically reconstructed into hyperbolic nearly linear cross polaritons by using the Lorentz dielectric response of anisotropic phonon vibration of the atomic layered material. The hyperbolic near-linear cross polariton exists in a heterogeneous interface of an atomic layered material and a crystal substrate, the equal-frequency profile of the hyperbolic near-linear cross polariton is in a hyperbolic asymptote form, the minimum wave vector gradually approaches to a free space wave vector k0, the equal-frequency curvature is approximately zero, and the wave vector direction is almost perpendicular to the energy flow direction, so that the zero-phase non-diffraction propagation characteristic is supported, and the performance of the hyperbolic near-linear cross polariton is improved. And a general phonon engineering strategy is provided for a programmable polarisation device and a novel low-loss photon function.