13 results about "Wavelength scale" patented technology

The application relates to a laser surface periodic structure construction method based on geometric structure guidance, and belongs to the field of laser micro-nano processing. The method first constructs a geometric structure with characteristic size and spatial arrangement on a material surface, and the geometric structure is obtained through mechanical processing, high-energy beam processing or other forming methods; then under the condition of random polarization or circular polarization laser irradiation, the geometric structure modulates the near-surface electromagnetic field distribution, thereby forming a periodic micro-nano structure. By adjusting the size, spacing and arrangement form of the geometric structure, controllable construction of one-dimensional gratings and two-dimensional array structures can be realized. The period of the formed structure is related to the wavelength of the incident laser, and satisfies the near-wavelength scale relationship (Lambda approximately 0.8-1.2 lambda), and can be adjusted by adjusting the wavelength of the laser. The method can realize large-area periodic structure preparation, and the process is relatively simple, and is suitable for surface optical regulation and functional interface construction.

The invention relates to the technical field of micron-sized droplet jet flow and ink jetting, in particular to an acoustically-driven micro-droplet jetting method and device, and the method comprises the steps that to-be-jetted liquid is stably conveyed to a nozzle micropore assembly; generating an ultrasonic signal, and driving an ultrasonic transducer after power amplification; the resonant vocal cavity nozzle is driven by the ultrasonic transducer, and a stable standing wave sound field with a sub-wavelength scale is formed in the cavity; acoustic radiation force is used for acting on a liquid column at the end of the spray head, and non-contact separation and directional spraying of liquid drops are achieved. The nozzle is controlled by the multi-axis motion platform to move on the substrate, so that liquid drops are deposited according to a preset track. According to the method and the device, the problems of nozzle blockage and the like caused by high viscosity or high solid content of liquid in a traditional piezoelectric or electrofluid driving mode are solved; the control precision of the liquid drop size and the spraying speed can be remarkably improved, and the device has excellent fluid adaptability and spraying stability and is particularly suitable for precise deposition and graphical jet printing of complex fluid such as photoresist, metal slurry and functional nano materials.

The present application relates to the field of micro-droplet jet and inkjet technology, and particularly relates to an acoustic driving micro-droplet jetting method and device, which comprises: stably delivering a liquid to be jetted to a nozzle micro-hole assembly; generating an ultrasonic signal, which drives an ultrasonic transducer after power amplification; driving the resonant acoustic cavity nozzle through the ultrasonic transducer to form a stable sub-wavelength scale standing wave acoustic field in the cavity; using the acoustic radiation force to act on the liquid column at the end of the nozzle to realize the non-contact separation and directional jetting of the droplet; and moving the nozzle on the substrate through a multi-axis motion platform to realize the deposition of the droplet according to a predetermined track. The method and device avoid the nozzle blockage and other problems caused by the high viscosity or high solid content of the liquid in the traditional piezoelectric or electrohydrodynamic driving mode; can significantly improve the control accuracy of the droplet size and jetting speed, have excellent fluid adaptability and jetting stability, and are particularly suitable for the precise deposition and patterning jetting of complex fluids such as photoresist, metal paste and functional nanomaterials.

The invention relates to the technical field of acoustic holographic transmission, and relates to a high-data-density acoustic holographic transmission method and system under a limited space bandwidth product. The method comprises the steps of obtaining a target image and generating an amplitude hologram; based on a physical model of sound wave propagation, establishing a coupling relation model between the complex sound pressure amplitude and the phase of the amplitude hologram; inversely inverting the amplitude hologram based on a time inversion principle, and inversely solving focusing phase distribution corresponding to the low-information-density amplitude hologram through a horny lizard optimization algorithm according to the coupling relation model; coupling the amplitude hologram with low information density with focusing phase distribution to generate a coupling amplitude hologram with high information density; and reconstructing a high-data-density sound field based on the high-information-density coupling amplitude hologram. According to the method, the diffraction limit of sound waves on the wavelength scale is successfully overcome, and super-focusing sound field reconstruction under the condition of low information density is achieved. In addition, the method can realize high data density sound field transmission even under the condition of low information density. The research provides a new insight for far-field acoustic super-resolution imaging and low-density information transmission, and has huge application potential in the fields of medical ultrasonic imaging, remote acoustic communication and the like.

The invention provides an acoustic metamaterial suitable for a leading edge slat, a design method and the slat, and belongs to the field of aircraft noise reduction. The acoustic metamaterial comprises a plurality of acoustic metamaterial subunits, and each subunit is composed of a micro-perforated plate and a cavity. And at least one of the plurality of subunits is linear and the internal channel of the cavity is linear, and at least one of the plurality of subunits is curved and the internal channel of the cavity is curved. The linear and curved subunits form a conformal unitary structure by an adaptive arrangement including profile adaptation within the airfoil profile and location distribution and combination within a profile perpendicular to the airfoil profile and along the leading and trailing edges. According to the invention, extremely limited space in the slat is utilized to the maximum extent through conformal design, a sound wave propagation path is prolonged at a sub-wavelength scale through linear and curved cavity channels, efficient low-frequency sound absorption is realized, broadband noise is covered through combination of multiple subunits, and the problem of insufficient low-frequency sound absorption in a slat space in a traditional scheme is effectively solved.

The utility model discloses a superlens light splitting imaging system, the optical elements of which comprise two biconvex lenses, an aspheric reflector bent towards the light incident direction and a reflective plane dispersion superlens, and the aperture diaphragm of the system is arranged at the reflective plane dispersion superlens. After passing through the entrance slit, incident light is transmitted, passes through the first biconvex lens and is reflected by the aspheric reflector, and reflected light enters the reflective plane dispersion super lens, enters the aspheric reflector after being split by the reflective plane dispersion super lens, is reflected by the aspheric reflector and reaches the detector through the second biconvex lens. The primary mirror of the spectroscopic imaging system provided by the utility model adopts a free-form surface shape, and the reflection-type plane dispersion super lens with a square titanium dioxide nano-column unit structure with a sub-wavelength scale is used as a spectroscopic element, so that the spectroscopic imaging system has the advantages of high spatial and spectral resolution, small system size and the like, can be used in the fields of hyperspectral detection of unmanned aerial vehicles and the like, and has wide application prospects. The application prospect is wide.

The invention discloses a large-frequency-ratio heterogeneous scaling model common-aperture antenna array, which relates to the technical field of antennas, and specifically comprises a three-waveband scaling array antenna layer, a circuit integrated architecture layer and all-waveband component layers which are connected in sequence. The antenna layer comprises an S-waveband antenna array, a K-waveband antenna array, a Ka-waveband antenna array and three kinds of media which are arranged in a coplanar mode, and a nested layout that holes are dug in the first medium to accommodate the second medium and holes are dug in the second medium to accommodate the third medium is adopted. The antenna layer establishes low-loss vertical connection with the component layer through glass through hole technology interconnection of the circuit layer and a radio frequency micro-spring vertical interconnection structure. And Ka, K and S radio frequency components are vertically stacked in the component layer from top to bottom. By using the wavelength scaling array and heterogeneous integration, the physical size is compressed, and the isolation and radiation efficiency are improved.

The application provides a super-structured optical fiber for generating a spindle beam and an optical acoustic endoscopy imaging system, the super-structured optical fiber comprising a fiber body and a super-structured optical structure arranged at an exit section of the fiber body, the super-structured optical structure comprising an optical expander and a super-structured structure array arranged at the end of the optical expander; the super-structured structure array is periodically arranged by super-structured units in a sub-wavelength scale, and the super-structured unit is in the form of a regular quadrangular prism; by clear phase modulation and parameter optimization, the super-structured optical structure is integrated at the end face of the fiber body, the emission light wave front is accurately regulated, a long focal depth spindle beam is obtained under the condition of a limited aperture and a compact structure, and the problem that the focal depth is limited in optical acoustic endoscopy imaging is effectively relieved; based on the combination of Bessel beams and the lateral spot size, the application maintains a high lateral resolution ability while extending the focal depth, avoids the defect that the resolution is significantly reduced in the traditional zooming scheme, and improves the imaging consistency and the signal-to-noise ratio.

The invention relates to an electromagnetic inverse scattering imaging method based on a nucleation depth expansion network, and belongs to the technical field of electromagnetic inverse scattering imaging. A kernel convolution module and a random Fourier feature module are integrated at the bottleneck position of the U-Net network, the kernel convolution module effectively extracts local spatial features of dielectric attributes by integrating a nonlinear kernel function, and the random Fourier feature module realizes efficient capture of global spectrum features through cosine base projection. Therefore, the expression ability of the sub-wavelength structure and the wavelength scale interference mode is considered. Through recursive iteration and end-to-end training of a physical operator, a reconstruction result can be optimized step by step, and organic combination of data driving and physical prior is realized. According to the method, through recursive iteration and end-to-end training, the reconstruction precision, generalization ability and physical consistency are effectively improved, and the method is suitable for the electromagnetic wave imaging fields of medical imaging, nondestructive testing and the like.

The invention discloses a double-layer metasurface structure filter for multicolor visible light communication, the filter is vertically integrated from bottom to top, and upper and lower layer electric field modes of the filter are subjected to coherent superposition and coupling under a phase matching condition to form a new LSPR-GMR mixed mode; the upper-layer metasurface structure is a sub-wavelength scale metal pattern, and the lower-layer metasurface structure is a sub-wavelength periodic unit based on a polycrystalline silicon material; an intermediate dielectric layer is arranged between the upper-layer metasurface and the lower-layer metasurface, physical isolation of the upper-layer metasurface and the lower-layer metasurface is achieved, and the intermediate dielectric layer serves as an energy transfer channel and a mode matcher to achieve efficient coupling between the upper-layer metasurface and the lower-layer metasurface; a substrate is arranged below the lower-layer metasurface, and a silicon wafer is selected as the substrate of the double-layer metasurface filter, provides physical support for the double-layer metasurface structure filter and serves as an active area of a Si-based photoelectric device. According to the invention, efficient and accurate selection of red light, green light and blue light is realized, and technical support is provided for high-performance optoelectronic devices and multi-color visible light communication.

An AESA antenna system with RF Beamformer PCB assemblies includes integrated radiating elements. The system utilizes a swappable PCB assembly with integrated thermal management. Such integrated thermal management may include a heat pipe thermal spreader, compatible with a PCB assembly to create a brick AESA architecture. A card cage and linear array mechanical assembly are configured to host a linear array of PCBs that span the UUBW spectrum within a common mechanical assembly. The PCBs in the brick AESA architecture can be configured / reconfigured within a wavelength scaled aperture (WSA) architecture.

A spectrometer device (110) for obtaining spectroscopic information on at least one object (112), the spectrometer device (110) comprising: i. at least one light source (114) for generating illumination light (116) for illuminating the object (112), the light source (114) comprising at least one light-emitting diode (118) and at least one luminescent material (120) for light-conversion of primary light generated by the light-emitting diode (118);10 ii. at least one detector (128) for detecting light (116, 130, 256) and, thereby, generating at least one detector signal; iii. at least one evaluation unit (136) configured for deriving the spectroscopic information on the object (112) from the at least one detector signal, wherein the evaluation unit (136) is configured for deriving the spectroscopic information on the object (112) by taking into consideration wavelength correction information.

According to the additive manufacturing method for improving the powder absorptivity through the ultrafast laser in-situ induction microstructure, metal powder is pretreated in a selected area through ultrafast laser, a micro-nano structure close to the ultrafast laser wavelength scale is manufactured on the surface of the metal powder, the micro-nano structure can generate the near-field enhancement effect on common near-infrared laser, and the powder absorptivity is improved through the near-field enhancement effect on the common near-infrared laser. The near-infrared laser absorption rate of metal powder can be effectively increased, long-pulse laser or continuous laser is allowed to melt the area with low power, severe flowing and splashing of a molten pool caused by excessive heat input are avoided, and formation of internal air holes is reduced. The heat accumulation of peripheral materials is reduced, the thermal gradient is favorably controlled, and the residual stress is reduced; a large amount of powder is prevented from adhering to the surface and surface quality is improved.