33 results about "Airy beam" patented technology

The invention discloses a method for generating a staggered superposition double-layer Airy light beam array capable of realizing double focusing, and belongs to the technical field of structured light regulation and control and special light beam generation. Aiming at the problems that the focusing characteristics of light beam arrays in transmission in different superposition modes are difficult to fully reveal in the prior art and the generation of an optical bottle depends on complex phase modulation or multiple optical elements, the method comprises the following steps: constructing a first layer of Airy light beam array and setting regulation and control parameters, constructing a second layer of Airy light beam array with staggered azimuth angles and setting regulation and control parameters, and constructing a second layer of Airy light beam array with staggered azimuth angles; a longitudinal double-focusing structure is realized through staggered superposition of double-layer Airy light beam arrays, and a vortex phase is introduced into double-focusing array light beams to form an optical bottle structure. According to the invention, the structure is simple, the longitudinal double-focusing and optical bottle structure can be realized only through the initial light field structure design, the focusing intensity and the regulation freedom degree are high, and the application of the light beam in the related fields of microscopic imaging, particle capture and the like is expanded.

The application discloses a method for generating an ultralong focal depth array beam, and belongs to the technical field of grating manufacturing. The method comprises the following steps: constructing a Bessel beam excitation phase and a circular Airy beam excitation phase, constructing a composite phase distribution according to the array Bessel beam excitation phase and the array circular Airy beam excitation phase, and encoding the composite phase distribution to a metasurface; irradiating the metasurface with a linear polarization state plane wave, so that a left-handed circular polarization component excites an array Bessel beam, and a right-handed circular polarization component excites an array circular Airy beam; the array circular Airy beam is converted into a Bessel propagation mode after self-focusing, is spliced with the array Bessel beam in an axial direction to form a continuous light field distribution, and an ultralong focal depth array beam is obtained. The method can be applied to the fields of parallel laser processing, three-dimensional microscopic imaging and microparticle manipulation, and can extend the focal depth of the array Bessel beam while keeping the transverse resolution close to the diffraction limit.

This invention relates to the field of optical technology, and discloses a cutting system and method based on Airy beams to achieve precise positioning and flexible position switching of the cutting spot. The system includes: a laser source; a coaxial polarizer, a polarization grating rotation assembly, and a lens; the polarization grating rotation assembly includes a polarization Airy beam generator and a first polarization grating and a second polarization grating that can rotate around the optical axis respectively; and the three are in close contact to separate the incident linearly polarized light into two Airy beams based on optical axis symmetry, and the deflection direction of each outgoing Airy beam changes with the rotation of the first polarization grating and / or the second polarization grating, and each outgoing Airy beam can be regarded as the same exit point; the control host is used to position and switch the position coordinates of the focal points of each Airy beam behind the lens on the fixed focal plane by controlling the rotation angle of the first polarization grating and the second polarization grating, the fixed focal plane being perpendicular to the optical axis and having the object to be cut placed on the cutting stage.

The invention discloses an Airy beam generation method and device. The method comprises the following steps: S1, determining a working frequency and constructing the device; s2, establishing a corresponding relationship between the geometric parameters of the leaky wave unit and the leaky wave phase and amplitude; s3, solving one-dimensional Airy beam complex amplitude distribution; s4, reversely solving unit geometric parameters to realize target complex amplitude regulation and control; and S5, constructing the metasurface complex amplitude regulation and control device based on the one-way electromagnetic mode. According to the invention, the size of the metal block and the thickness of the air dielectric layer are independently regulated and controlled, so that complex amplitude regulation and control of transmission waves in a free space are realized; the metasurface device is simple and convenient in structural design, high in efficiency, easy to integrate and reconfigurable, can replace a spatial light modulator through a one-way waveguide phase regulation and control function, reduces the system cost, improves the integration level, and is suitable for on-chip integrated efficient free space wavefront control application.

The invention relates to a terahertz continuous metasurface device based on magnetic surface plasma and application thereof, the device takes a unidirectional waveguide as a substrate, the unidirectional waveguide is formed by sequentially and horizontally overlapping an electric opaque layer, a dielectric layer and a magnetized semiconductor layer from top to bottom, the thickness of the electric opaque layer is modulated through a continuous function model, and a metal sheet array is introduced into the waveguide to form the terahertz continuous metasurface device. The invention also relates to an application of the device in generating Airy beams. Terahertz unidirectional transmission based on magnetic surface plasma is supported. Phase regulation and control can be realized by adjusting the height of the metal sheet, and continuous amplitude regulation and control can be realized by continuously modulating the thickness of the radiation layer through a continuous function model. Compared with a metasurface depending on a discrete structure, the metasurface can reduce energy loss and wavefront distortion, and improve beam regulation and control precision and stability. On the basis of the characteristics, the one-dimensional finite Airy beam with self-acceleration, non-diffraction and self-healing characteristics is generated.

The utility model discloses a water guide laser processing device based on Airy beam, which comprises a mounting seat, a mounting groove is arranged in the mounting seat, a mounting plate is arranged in the mounting groove, the bottom of the mounting plate is fixedly connected with a laser cutting instrument main body, the bottom of the laser cutting instrument main body is provided with a laser cutting head, and the laser cutting head is fixedly connected with the mounting plate. A fixing assembly is arranged in the mounting base, a cooling assembly is arranged on the outer side of the mounting base, the fixing assembly and the cooling assembly are used in cooperation, avoiding grooves are formed in the two fixing grooves, and the extrusion head and the positioning rod are used in cooperation. According to the water-jet guided laser processing device based on the Airy beam, the laser cutting instrument body can be rapidly mounted and dismounted through the arranged fixing assembly, external tools are not needed in the mounting and dismounting process, the mounting steps are simple and rapid, the structure is simple, and practicability is high.

The invention belongs to the technical field of metasurfaces and plane lenses, and particularly relates to a focusing metasurface lens with an anti-shielding function, the lens is composed of 40 * 40 units with the period of 7.5 mm, each unit comprises a top layer metal annular patch, a dielectric layer and a bottom layer metal patch, the relative dielectric constant of a dielectric substrate is 2.65, and the relative dielectric constant of the dielectric substrate is 2.65. The units realize anisotropic response through circumferential notch design, a stable 180-degree phase difference is formed by adopting a mirror image inversion structure, the 1-bit phase modulation requirement is met, the array performs phase coding in the radial direction according to an Airy function, and a hollow annular layout is adopted, so that the self-bending and self-repairing characteristics of Airy beams are effectively utilized, and the phase modulation efficiency is improved. The electromagnetic wave can bypass physical shielding of an axis area, field intensity reconstruction is realized at a set focus, and the design can remarkably improve focusing gain and energy recovery capability of a system in a shielding environment while maintaining high cross polarization conversion efficiency in Ku frequency band application of 13GHz and the like.

A method of processing a transparent workpiece, comprising: directing a laser beam output by a beam source onto a phase-adjusting device such that the laser beam downstream of the phase-adjusting device is an Airy beam; and directing the Airy beam onto a surface of the transparent workpiece. The Airy beam forms an Airy beam focal region in the transparent workpiece, the Airy beam of the Airy beam focal region having a maximum intensity of 100 TW / cm 2 or less, the Airy beam of the Airy beam focal region inducing an absorption in the transparent workpiece, the induced absorption generating a bend defect in the transparent workpiece.

The invention belongs to the field of ultrasonic nondestructive testing, and discloses a plane active focusing piezoelectric ultrasonic transducer based on an Airy beam structure, the plane active focusing piezoelectric ultrasonic transducer is provided with a piezoelectric plate, a matching layer, a backing, a shell and a resin gasket, the shell is internally provided with a first containing cavity and a second containing cavity which are through and communicated, the diameter of the first containing cavity is smaller than that of the second containing cavity, the backing is located in the first containing cavity, and the resin gasket is located in the second containing cavity. The cross section of the resin gasket is in an L shape, the resin gasket is located in the second containing cavity, the resin gasket is tightly attached to the shell, the piezoelectric plate is clamped at the L-shaped bending position of the resin gasket, the acoustic impedance matching layer is tightly attached to the piezoelectric plate, and the resin gasket can prevent the backing from moving towards an opening in one end of the shell. Vibration energy of the piezoelectric plate is transmitted to the backing through a hole in the center of the resin gasket, the transducer works in a thickness vibration mode, and the center frequency of the transducer ranges from 300 kHz to 5 MHz. The invention further discloses two transducers outside the center frequency. The transverse resolution of the transducer can be improved, and meanwhile, the sensitivity is improved.

The invention discloses a super lens for generating a collimated Airy beam, a light source system and an integration method of the light source system, the super lens comprises a substrate and a nano column array located on the substrate, the nano column array comprises a plurality of nano columns, and the phase of the center of each nano column meets the following conditions; wherein f is the focal length of the super lens, b1 is the attenuation coefficient of the Airy beam, lambda is the wavelength of the incident light, x is the abscissa of the center of each nano column in a rectangular coordinate system with the center of the super lens as the original point, and y is the ordinate of the center of each nano column in the rectangular coordinate system with the center of the super lens as the original point. According to the super lens, incident plane light can be shaped into a collimation Airy beam, and an optical system is greatly simplified.

A transmission device that transmits a signal to a reception device provided with a plurality of reception antennas disposed at mutually different positions, the transmission device comprising a beam generation unit that generates a plurality of airy beams and transmits transmission data using the generated plurality of airy beams, which are adjusted so that main lobes of the airy beams having properties of spatially asymmetric radio waves are directed to the positions of the mutually different reception antennas and side lobes of the airy beams are not directed to the positions of any of the reception antennas.　

The application discloses a kind of based on non-diffracting airy beam intrahepatic blood vessel three-dimensional imaging method, belong to intrahepatic blood vessel three-dimensional imaging technical field, solve the problem of insufficient accuracy and detection sensitivity of existing detection method, method includes by liver transplantation or biopsy surgery obtains liver tissue, liver tissue is fixed using 4%PFA processing, liver tissue is bleached using H2O2Solution, antigen repair is carried out to liver tissue using FLASH solution, using goat serum blocking solution to the liver tissue after antigen repair blocking treatment;Liver tissue immunostaining treatment, liver tissue dehydration treatment, based on non-diffracting airy beam and high-throughput microscope to the liver tissue after processing imaging, obtain the three-dimensional imaging picture of liver tissue;The application is immunofluorescence staining and transparent treatment to liver tissue, so that laser can smoothly penetrate tissue and carry out three-dimensional imaging, can realize single wide-range image capture.

A transmission device according to the present invention includes: a beam generation unit that generates an Airy beam having a property in which radio waves are spatially asymmetric; and a control unit that performs spatial modulation of a carrier wave by controlling a phase pattern such that spatial distribution of the Airy beam generated by the beam generation unit is different.　

The application discloses a method and system for improving the sudden self-focusing ability of a circular Airy beam, and relates to the technical field of beam transmission and control. The method comprises the following steps: determining the transmission direction of the circular Airy beam by acquiring the circular Airy beam transmitted in free space and establishing a space orthogonal coordinate system; determining the light intensity distribution of the circular Airy beam on a focal plane and an initial plane and the on-axis light field of the circular Airy beam according to the light field integral form of the circular Airy beam on any observation plane; and determining the intensity contrast according to the light intensity distribution and the on-axis light field. Under the condition of a given exponential decay factor, the dimensionless radius of the main ring in the circular Airy beam is changed, a first curve graph is drawn according to the on-axis light field, the optimal dimensionless radius is determined according to the first curve graph and the intensity contrast, and finally the strongest sudden self-focusing ability of the circular Airy beam is obtained according to the optimal dimensionless radius. The application realizes the improvement of the sudden self-focusing ability of the circular Airy beam.

The invention belongs to the technical field of electromagnetic metamaterials, and discloses a transmission metasurface antenna for generating a radially symmetric Airy and bimodal OAM composite wave beam, and the transmission metasurface is formed by rotating an upper layer metal patch and a lower layer metal patch at different positions of an array plane by a certain angle through a plurality of N-shaped geometric phase units. Phase compensation can be carried out on incident waves emitted from a feed source, and + 1 and-1 order vortex modes are respectively generated by incidence of left-handed and right-handed circularly polarized waves. According to the invention, phase modulation is carried out on the initial field distribution of the incident electromagnetic wave at the metasurface, the radial symmetric Airy wave beam with the self-focusing characteristic can be generated, spin decoupling is utilized to carry the OAM of two modes, the two OAM modes have the same divergence angle, and the method has potential application prospects in the field of large-capacity high-speed communication systems.

The invention relates to the field of structured light field regulation and control and anisotropic medium light propagation, and discloses a method for regulating and controlling a spin Hall effect of a circular Airy beam by using uniaxial crystal and angular modulation. The method comprises the following steps: constructing a circular Airy beam with a self-focusing characteristic; angular phase modulation is applied to the system, so that the circular symmetry of the system is broken; the modulated light beam enters a uniaxial crystal to be propagated, and due to spin-orbit coupling in the crystal, a spin Hall effect is generated: a left-handed circular polarization component and a right-handed circular polarization component are gradually separated from each other and move along the positive axis and the negative axis respectively; after a light beam is emitted out of the uniaxial crystal, two focuses which are spatially separated and opposite in spinning direction are formed on a self-focusing focal plane. The device and the method can be used for structured light beam regulation and control, spin-orbit coupling and polarized light field modulation research.

The invention discloses a micropore chamfer machining device and method based on an adjustable Airy beam, and belongs to the technical field of laser precision machining.The micropore chamfer machining device comprises a light source module, a beam modulation module and a beam scanning module, and the light source module is used for outputting a laser beam; the light beam modulation module comprises a liquid crystal spatial light modulator and a regulation and control assembly, the laser beam is modulated into an Airy beam through the liquid crystal spatial light modulator, and the regulation and control assembly loads different phase holograms to the liquid crystal spatial light modulator to regulate and control the Airy beam; the light beam scanning module comprises a high-speed two-dimensional scanning assembly and a bearing platform, the bearing platform is used for bearing a to-be-machined part, the Airy light beam is emitted to the to-be-machined part through the high-speed two-dimensional scanning assembly, and the high-speed two-dimensional scanning assembly is used for driving the Airy light beam to conduct scanning along a preset track so as to conduct chamfering machining on the to-be-machined part; therefore, the machining efficiency and the machining quality of the micropore chamfering can be improved.

This transmission device that communicates with a reception device comprises: a transmission antenna that is installed at a predetermined angle in the transmission device and transmits a transmission signal to the reception device; a beam generation unit that generates, for the transmission signal transmitted by the transmission antenna, a circular Airy beam so as to have a predetermined focal length; and a control unit that controls at least one of the predetermined focal length and the predetermined angle on the basis of the reception intensity of the circular Airy beam fed back from the reception device.

The invention relates to the technical field of special combined machining, in particular to a laser electrolysis combined machining method and device based on beam shaping, and the machining method comprises the steps that laser machining parameters and electrolysis jet machining parameters in the machining device are determined according to a workpiece to be machined; the machining device is adjusted so that the output end of the machining device can be aligned with the machining area of the workpiece to be machined, the machining device is started, machining laser output by the output end of the machining device is used for irradiating the machining area so that materials in the machining area can be melted or gasified or subjected to phase change, and meanwhile the output end of the machining device sprays electrolyte to the machining area; under the action of an electric field applied by the machining device, materials in the machining area are electrolyzed and dissolved, and machining laser is a Bessel beam or an Airy beam; and when the machining area reaches the preset size and the preset precision, the machining device is stopped, and machining is completed. The machining efficiency and the machining quality can be improved at least.

The application provides a full-optical fiber circular Airy light generating device, which is characterized by being composed of a single-mode optical fiber (1), a multi-mode optical fiber (2), a metal film (3) and a circular groove plasmonic antenna array (4). The multi-mode optical fiber (2) is fused on the single-mode optical fiber (1) and plays a role of expanding the transmission light field in the single-mode optical fiber core. The metal film (3) is plated on the end face of the multi-mode optical fiber (2). The circular groove plasmonic antenna array (4) is etched on the metal film (3). The transmission light field expanded by the multi-mode optical fiber (2) is irradiated on the circular groove plasmonic antenna array (4) to excite a plasmonic wave, and the plasmonic wave is then radiated and output through the circular groove plasmonic antenna array (4) to form a fiber end output light field. The groove size parameters, groove quantity and arrangement mode of the circular groove plasmonic antenna array (4) are designed according to the fiber end output light field being circular Airy light. The application belongs to the technical field of fiber microstructure devices.

The invention discloses a three-order nonlinear coefficient measurement method based on Airy beams, relates to the field of three-order nonlinear coefficient measurement of thin-layer optical materials, and aims to solve the problem that in the prior art, single measurement, high precision and low damage cannot be met at the same time. A cubic phase mask and a sample behind the cubic phase mask are irradiated through parallel Gaussian light, an Airy beam image is collected after Fourier transform and image amplification, and the third-order nonlinear coefficient of the material can be calculated through displacement and light field parameters of the Airy beam. The method is applicable to thin-layer samples, high in measurement precision, capable of directly determining specific coefficient values and symbols through single measurement, applicable to light damage sensitive materials, simple in measurement device and low in data processing difficulty. The invention provides a more robust and less invasive alternative for characterizing the nonlinear response in a thin sample.

The application provides a circularly symmetric Airy beam wavefront phase modulation method based on a multi-focal lens, which comprises the following steps: determining the beam parameter of a CAB; calculating the self-focusing focal length d of the CAB; shielding all other light rings except the nth light ring, solving a single light ring diffraction integral, thereby obtaining the focal length d n ; reasonably estimating the modulation focal length f n according to the difference between the self-focusing focal length d and the single light ring focal length d n ; and finely adjusting the modulation focal length f n of each light ring based on the obtained modulation focal length f n of each light ring, so as to achieve the best modulation effect. The application realizes higher energy concentration and better focusing characteristics without changing the initial light intensity distribution of the CAB, and improves the focusing precision of the light beam.

The invention provides a multi-Airy beam generation method based on adjustable distribution. The multi-Airy beam generation method comprises the following steps: constructing basic phase distribution of a single Airy beam; designing phase shift modulation factors corresponding to the plurality of sub-beams, wherein the phase shift modulation factors are set based on the displacement characteristics of Fourier transform; superposing the phase shift modulation factor with the frequency spectrum of the single beam of Airy light to obtain composite phase distribution; and generating a multi-Airy beam array with adjustable and controllable distribution based on the composite phase distribution. The method provided by the invention can flexibly adapt to specific requirements of different scenes on beam distribution, and the application adaptability and practicability of the multi-Airy beam array in the fields of laser confrontation, laser processing, optical communication and the like are remarkably improved.

The invention discloses a super lens and a light source system used for generating a collimation circular Airy vortex beam, the super lens comprises a substrate and a nano column array located on the substrate, the nano column array comprises a plurality of nano columns, and the phase of the center of each nano column meets the following conditions: 1, 1, 2, 3, 4, 5, 6, 7, 8, 8, 8, 9, 10, 11, 12, 12, 13, 13, 14, 16, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17 The Airy beam phase is a circular Airy beam phase; the phase is a vortex phase and a collimating lens phase; wherein f is the focal length of the super lens, r is the distance from the center of each nano-column in a polar coordinate system with the center of the super lens as the original point to the original point, b1 is the attenuation coefficient of the circular Airy beam, r0 is the main lobe radius of the circular Airy beam, lambda is the wavelength of incident light and is the topological charge carried by the vortex phase, and r is the distance from the center of each nano-column in the polar coordinate system with the center of the super lens as the original point. Theta is the azimuth angle of the center of each nano column in a polar coordinate system with the center of the super lens as the original point. According to the super lens, incident plane light can be shaped into a collimation circular Airy vortex light beam, and an optical system is greatly simplified.

An Airy beam generation method and device, the method comprising: S1, determination of working frequency and device construction; S2, establishing the corresponding relationship of leaky wave unit geometric parameters and leaky wave phase, amplitude; S3, solving one-dimensional Airy beam complex amplitude distribution; S4, backstepping unit geometric parameters to realize target complex amplitude regulation; S5, constructing a super surface complex amplitude regulation device based on one-way electromagnetic mode. The application realizes the complex amplitude regulation of transmission wave in free space by independently regulating the size of metal block and the thickness of air medium layer; the super surface device is simple in structure design, high in efficiency, easy to integrate and reconfigurable, and can replace the spatial light modulator through the one-way waveguide phase regulation function, reduce the system cost and improve the integration, and is suitable for on-chip integrated high-efficiency free-space wavefront control applications.

The invention discloses a reconfigurable obstacle avoidance type microwave wireless power transmission system. The reconfigurable obstacle avoidance type microwave wireless power transmission system comprises an upper computer, a control circuit and a reconfigurable metasurface unit, the upper computer is used for calculating the phase distribution of the high-curvature Airy beam generated by the reconfigurable metasurface, and further discretizing 1-bit to generate a 0-1 coding bit stream; the control circuit is used for converting a bit stream generated by an upper computer into positive and negative levels, and is used for controlling the connection or disconnection of each metasurface unit PIN tube; and the reconfigurable metasurface unit is used for realizing 1-bit wave beam phase regulation and control, so that discrete phase distribution of high-curvature Airy wave beams is realized and generated according to a signal of the control circuit. The method has the characteristics of low cost, low complexity and capability of flexibly and dynamically avoiding obstacles in the environment.

A kind of terahertz continuous metasurface device based on magnetic surface plasmon and its application, the device with electric opaque layer, dielectric layer, magnetized semiconductor layer from top to bottom sequentially horizontal superposition unidirectional waveguide as substrate, the thickness of electric opaque layer is modulated by continuous function model, and is formed in waveguide by introducing metal sheet array.This application also relates to the application of the device in generating airy beam.This application supports terahertz unidirectional transmission based on magnetic surface plasmon.This application can realize phase control by adjusting the height of metal sheet, and can realize continuous amplitude control by continuously modulating the thickness of radiation layer through continuous function model.Compared with super-structured surface relying on discrete structure, this application can reduce energy loss and wavefront distortion, and improve beam control precision and stability.Relying on the above characteristics, this application generates one-dimensional finite airy beam with self-acceleration, no diffraction and self-healing characteristics.

A method of fabricating a binary metasurface for producing an ultrasound Airy beam for underwater ultrasound applications is provided. The method includes generating an amplitude distribution of an Airy beam at a frequency, and converting the amplitude distribution into a binary phase profile. The method also includes generating a 3D printing design of a binary metasurface based on the binary phase profile, wherein the binary metasurface includes ridges and grooves defined by neighboring ridges, a ridge having a thickness corresponding to a phase delay of π / 2 of the Airy beam between water and a 3D-printable material. The method further includes additively manufacturing the binary metasurface with the 3D-printable material based on the 3D printing design.

A method includes directing a laser beam onto a phase adjustment device such that the laser beam downstream of the phase adjustment device is a modified Airy beam having a modified Airy beam focal region with a main lobe and a plurality of side lobes. The main lobe has a lobe aspect ratio of 1.2 or greater.

The invention discloses a programmable cooperative regulation and control method and system for a three-dimensional multi-focus beam array. The method comprises the following steps: step 1, constructing an annular chirp Airy beam array; step 2, dividing sub-beams in the annular chirp Airy beam array constructed in the step 1 into G groups, and independently configuring a first-order chirp factor and a second-order chirp factor for each group of sub-beams; wherein G is an integer greater than or equal to 1; and step 3, regulating and controlling a plurality of focuses formed by the annular chirp Airy beam array in the three-dimensional space according to at least one attribute of the number, the transverse position, the longitudinal focal length and the relative intensity of the focuses by cooperatively regulating the group number G of the sub-beams and the corresponding first-order and second-order chirp factors. The method has flexible regulation and control capability and high degree of freedom of operation, and an innovative technical solution can be provided for the fields of multi-target optical operation, laser processing and other fields needing multi-focus collaborative operation.