77 results about "Metal grating" patented technology

The invention discloses a polarization sensitive type broadband absorber based on metal-medium stacking, and relates to the technical field of micro-nano photonic devices and infrared detection. The absorber sequentially comprises a bottom-layer high-loss metal reflecting layer, a multi-layer stacked composite dielectric cavity structure and a top-layer sub-wavelength metal grating from bottom to top, according to impedance matching and interference resonance theories, a broadband absorption substrate is constructed through a multi-layer film structure at the bottom, and light energy is converted into heat energy by utilizing the high loss characteristic of bottom layer metal; plasmon resonance is excited through the top metal grating, the coupling efficiency of TM polarized light is enhanced, and TE polarized light is cut off; the above structural design successfully realizes efficient broadband absorption and high polarization extinction ratio in an infrared band. The structure is simple in design, is compatible with a CMOS technology, and has excellent wide-angle stability. And meanwhile, polarization screening can be realized without an external polaroid, and miniaturization and integration of an infrared detection system are facilitated.

The invention relates to the technical field of ocean observation, in particular to a hydrate reservoir information in-situ monitoring device. Comprising a monitoring box body; a metal grating plate is arranged at the bottom of the monitoring box body, and hydrate reservoir sediments can enter the monitoring box body through grating holes in the metal grating plate; a dissolved oxygen sensor, a pH sensor, a Raman probe rod and a resistivity probe rod are sequentially arranged in the monitoring box body from top to bottom, and a water tank camera is arranged on the side wall of the monitoring box body; a plurality of annular electrodes are arranged on the resistivity feeler lever in the circumferential direction of the feeler lever at intervals, and each annular electrode is connected with an annular electrode distance adjusting mechanism and an annular electrode aperture adjusting mechanism. And in-situ monitoring of the hydrate reservoir can be realized.

The safety barricade system for use with metal grate flooring may include a stanchion, one or more retainers, and a warning light. The bottom of the stanchion may detachably couple to a metal grate includes a floor and may be held in place by the one or more retainers. The stanchion may be vertically-oriented such that the top of the stanchion is elevated above the metal grate, placing the top of the stanchion within the cone of vision of a user. The stanchions may be used individually to designate a position. The stanchions may be used in groups and in conjunction with caution tape to designate a boundary. The warning light located at the top of the stanchion may be illuminated to increase the visual awareness of the stanchion.

The invention relates to the field of photoelectric detection, and discloses a photoelectric detector based on a grating structure and a photoelectric detection method.The photoelectric detector comprises a substrate layer and a photoelectric material layer, and the photoelectric material layer comprises a metal grating structure, a first electrode, a second electrode, a first photoelectric confinement material and a second photoelectric confinement material; the metal grating structure comprises a first metal grating and a second metal grating, the first photoelectric confinement material and the second photoelectric confinement material are connected, and a depletion junction region is formed at an interface; the first metal grating and the second metal grating are symmetrically arranged on two sides of the depletion junction region and are used for exciting a plasmon mode to form a local light field; the first electrode is connected with the first photoelectric confinement material, the second electrode is connected with the second photoelectric confinement material, and the first electrode and the second electrode are used for extracting photon-generated carriers. According to the technical scheme provided by the invention, the separation efficiency of photon-generated carriers and the response performance of the photoelectric detector can be improved.

A high-strength protection grid is produced with a plurality of metal wires which are intercalated with metal ropes. The metal wires are interlaced with each other in interlacing portions, or are twisted in twists around the ropes in twisting portions. The interlacings between the wires and the twists of the wires with the ropes define the mesh of the grid. The interlacings and the twists are each unidirectional. The ropes have an external diameter which is greater than the wires and greater than 8 mm, preferably between 9 and 12 mm, even more preferably approximately of 10 mm. The grid is produced with a machine which is provided for the passage of ropes with such an increased diameter with respect to the ropes of the protection grids of the prior art.

The utility model provides a board arrangement structure capable of improving wiring isolation and a circuit board. The board arrangement structure for improving the wiring isolation comprises a dielectric layer, two floors which are respectively fixed on the bottom surface of the dielectric layer and are separated from each other, and two microstrip lines which are fixed on the top surface of the dielectric layer at an interval and are coupled with each other, the first metal ground hole and the second metal ground hole penetrate from the bottom surface of the dielectric layer to the top surface of the dielectric layer and are mutually spaced; the first metal layer is fixed on the top surface of the dielectric layer and is arranged opposite to one of the floors; the second metal layer is fixed on the top surface of the dielectric layer and is arranged opposite to the other floor; and the energy consumption device is connected with the first metal layer and the second metal layer. Compared with a metal paving mode, the plate arrangement structure for improving the wiring isolation degree has a better isolation effect, and compared with a space metal grating mode, the plate arrangement structure for improving the wiring isolation degree does not need to increase working procedures and is lower in cost.

The embodiment of the present application discloses a kind of transmission type terahertz absorption structure and preparation method thereof.Transmission type terahertz absorption structure includes at least one transmission type terahertz absorption composite film layer, transmission type terahertz absorption composite film layer includes substrate and the metal grating layer, insulating layer and graphene layer that are sequentially stacked in substrate side;Wherein metal grating layer and graphene layer are electrically connected with external power supply.The technical scheme of the embodiment of the present application is based on electromagnetic wave theory and the electrical properties of graphene, by additional voltage control Fermi level of graphene, adjust the absorption of absorption structure to terahertz, make the terahertz wave that pass through the present absorption structure have different intensity information under the influence of external voltage, play the role of switch, and have the advantages of active regulation, real-time control, accurate control, suitable for terahertz spectrum imaging analysis, single-pixel imaging and spectrum measurement etc.

The utility model aims at solving the problem of low filtering efficiency caused by the low melting point of asphalt blocking the filter screen, provides a device for filtering ring asphalt, belongs to the technical field of filter device. The device for filtering ring asphalt comprises: a metal filter container, a metal grid support plate and a metal filter screen. The bottom of the metal filter container is provided with a drain; the metal grid support plate is clamped and fixed in the metal filter container; the metal filter screen is laid on the upper surface of the metal grid support plate; wherein, the metal grid support plate provides cold energy to the metal filter screen in contact with it during use. In the utility model, the metal grid support plate provides cold energy to the metal filter screen in contact with it, especially when the wastewater temperature is relatively high or the use environment temperature is relatively high, a local low-temperature cold environment is formed, so that the deposited asphalt particles can maintain the particle form, the softening phenomenon of asphalt is delayed, and the use efficiency of the metal filter screen is ensured.

The invention relates to the technical field of gratings, in particular to a metal wire grating structure and a preparation method thereof.The metal wire grating structure comprises a substrate, a reflecting layer, a transparent dielectric layer and a metal grating layer which are sequentially stacked from bottom to top; wherein the thickness of the metal grating layer is not greater than 30nm; when incident light irradiates the metal wire grating structure from the side, away from the transparent dielectric layer, of the metal grating layer, part of the incident light is directly reflected by the metal grating layer to form a first path of reflected light, and the remaining part of the incident light enters the transparent dielectric layer through intervals between the metal wires. And after being reflected by the reflecting layer, the first path of reflected light is emitted out again through the transparent dielectric layer and the interval between the metal wires to form a second path of reflected light, and the phase difference between the first path of reflected light and the second path of reflected light is odd times of pi. According to the invention, the anti-pollution capability and the anti-wear capability of the grating are improved at least on the premise of ensuring that the grating has relatively high diffraction efficiency.

The application discloses a kind of methods for realizing cylindrical grating coherent Smith-Purcell radiation enhancement, Smith-Purcell radiation is a kind of incoherent spontaneous radiation, the power of radiation is very low, not easy to detect and application, to realize high intensity Smith-Purcell radiation, the application proposes based on quasi-continuous domain bound state enhancement method.First, the electron bunch string is generated using the electron gun;Then, make the electron bunch string pass through the surface of cylindrical metal grating, the repetition frequency of electron bunch string is used as the resonance frequency of quasi-continuous domain bound state, to realize the enhancement of coherent Smith-Purcell super-radiation, and finally the electron enters the collecting electrode.The cylindrical grating coherent Smith-Purcell radiation enhancement method proposed in the application is simple to operate, and has obvious effect, easy integration, low cost and other characteristics.

This invention relates to the field of optoelectronic device technology, and in particular to a laser based on a top-surface metal layer and a planar metal grating, and its fabrication method. The laser comprises a gain chip, an optical waveguide, a planar metal grating, a capping layer, and a metal layer. The planar metal grating fabricated using an electronic evaporation deposition process replaces the traditional complex three-dimensional etching, significantly improving the controllable precision and flatness of the grating structure. It eliminates the InP secondary epitaxial process, simplifying the overall process flow, reducing production costs, and simultaneously improving product performance consistency and yield. It also significantly improves reflection filtering efficiency, ensures the purity of the Bragg reflection spectrum, and helps achieve narrow linewidth performance in lasers. The capping layer above the planar metal grating effectively solves the problem of lattice mismatch in semiconductor secondary epitaxy, and can also confine diffracted light, reducing light energy leakage. The external cavity structure design increases the degree of freedom.

The embodiment of the invention provides a plasmon waveguide structure and a refractive index sensor, and the plasmon waveguide structure comprises a metal substrate layer; a multi-period composite metal grating layer; the dielectric layer is arranged between the metal substrate layer and the multi-period composite metal grating layer; wherein the multi-period composite metal grating layer is composed of nano-metal supercell structures which are periodically arranged in the direction, and each nano-metal supercell structure is formed by periodically arranging at least two metal structures with different grating periods in the direction according to a preset grating interval; and the structures are alternately arranged in the direction at preset periodic intervals. According to the invention, decoupling and flexible regulation and control of resonance position and intensity can be realized based on a plurality of independent resonant cavities with spatial separation provided by the multi-period composite metal grating layer.

The application provides a method for exciting interband plasmons of double-layer graphene and a prepared device, and belongs to the technical field of optical devices, and comprises the following steps: sequentially laminating a third insulating layer, double-layer graphene and a second insulating layer to form a vertical heterojunction, transferring the vertical heterojunction to a substrate on which a first insulating layer is grown, obtaining a clean initial device substrate through heating separation and solvent cleaning, then preparing a nanoscale metal grating layer on the vertical heterojunction surface of the initial device substrate to form a device intermediate body, and preparing electrodes on the left and right sides of the device intermediate body, so that the electrodes are electrically connected with the double-layer graphene, an electrical regulation channel of the Fermi surface of the double-layer graphene is constructed, and a complete device for exciting interband plasmons is obtained. The nanoscale metal grating array can effectively excite interband plasmons of double-layer graphene, significantly improve the light-plasmon coupling efficiency and realize energy regulation of interband plasmons.

The invention relates to the technical field of optical detection, in particular to a buried structure detection device based on laser-induced ultrasonic waves, which comprises a laser, a light splitting element, a light modulation module, a beam combining element, a light sensitive element and a lock-in amplifier, and is characterized in that pulse laser generated by the laser is divided into pump light and detection light; after the light modulation module periodically modulates the pump light, the pump light and the probe light are confocal on the surface of a to-be-detected sample through the beam combining element; the pump light excites ultrasonic waves, and the ultrasonic waves are reflected by the metal grating in the sample to form a sound wave induction interface grating; the detection light is received by the photosensitive element after being diffracted and is converted into an electric signal; a lock-in amplifier extracts a synchronized diffracted signal from the signal using the modulation frequency. The method can effectively penetrate through the opaque material layer to detect the completely buried alignment mark, overcomes the limitation of the traditional optics and the existing laser ultrasonic technology, and improves the detection precision and reliability of the deep structure.

The application relates to the technical field of semiconductor lasers, in particular to a high-performance intracavity laser based on a micro-gain grating region double-side AR plus an inclined angle, which comprises a high-performance intracavity laser based on a micro-gain grating region double-side AR plus an inclined angle, including a substrate layer and a back ridge waveguide; the back ridge waveguide is arranged on the upper end face of the substrate layer; the back ridge waveguide comprises a composite structure grating section located on the left side and a gain region waveguide section located on the right side; an i-layer semiconductor Bragg grating is etched in the composite structure grating section, and i is a natural number; a metal grating electrode is covered on the top of the composite structure grating section; a quantum well layer is arranged in the gain region waveguide section; a gain region electrode is covered on the top of the gain region waveguide section; and an inclined end face is arranged at the left end of the gain region waveguide section. The application overcomes the inherent defects of traditional DBR, DFB and traditional external cavity lasers from the aspects of structure and mechanism.

The utility model relates to the technical field of folded antennas, in particular to a metasurface folded antenna with broadband wave beam scanning capability, which comprises a reconfigurable metasurface, a polarization conversion metasurface and a linear polarization feed source antenna, and is characterized in that the reconfigurable metasurface comprises a first dielectric plate, a second dielectric plate, a first metal grating, a second metal grating and a first metasurface; the polarization conversion metasurface comprises a third dielectric plate and two second metasurfaces, the linear polarization feed source antenna comprises a fourth dielectric plate, a fifth dielectric plate, a third metasurface, a fourth metasurface and a metal bottom plate, and the metasurfaces convert spherical waves emitted by an antenna feed source into plane waves through phase compensation. According to the array antenna, a plane wave is converted into a scannable low-SLL pencil-shaped light beam, the contour of the array antenna is reduced by 2 / 3, a simulation experiment test shows that + / -50-degree beam scanning can be realized on an E surface and an H surface within the broadband range of 8.1-11.3 GHz, the peak gain is 17.8 dBi, the aperture efficiency is 14%, and the 3dB gain bandwidth is greater than 30%.

The utility model relates to the field of metal plate processing, in particular to a metal plate cutting device. The utility model provides a metal plate cutting device which can automatically fix and turn over metal plates with different thicknesses to carry out double-sided cutting, prevent thicker metal plates from being not cut off, improve the cutting efficiency and quality and is flexible and convenient to use. A metal plate cutting device comprises a cutting table, a metal grating and the like, and the upper side of the cutting table is connected with the metal grating. A metal plate is fixed to the clamping plate, the height of the plate is adjusted through movement of the connecting plate, the metal plate is turned over through rotation of the rotary connector, double-face cutting is conducted on the metal plate through movement of the transmission supporting column and the laser cutter, and therefore the metal plates of different thicknesses can be automatically fixed and turned over to conduct double-face cutting. Thick metal plates are prevented from being not cut off, the cutting efficiency and quality are improved, and use is flexible and convenient.

The application relates to the technical field of gratings, in particular to a metal wire grating structure and a preparation method thereof. The metal wire grating structure comprises, from bottom to top, a substrate, a reflection layer, a transparent dielectric layer and a metal grating layer which are stacked in sequence; wherein the thickness of the metal grating layer is not greater than 30 nm; when incident light irradiates the metal wire grating structure from the side of the metal grating layer far from the transparent dielectric layer, part of the incident light is directly reflected by the metal grating layer to form first reflected light, and the remaining part of the incident light enters the transparent dielectric layer through the intervals between the metal wires, is reflected by the reflection layer, and then is emitted again through the transparent dielectric layer and the intervals between the metal wires to form second reflected light; the phase difference between the first reflected light and the second reflected light is an odd multiple of pi. The application is at least beneficial to improving the anti-pollution ability and the anti-abrasion ability of the grating under the premise of ensuring that the grating has high diffraction efficiency.

The application provides a back-illuminated image sensor and a manufacturing method thereof, and the method comprises the following steps: providing a substrate, the substrate comprises a pixel area and a non-pixel area, and a plurality of pixel electrodes located in the pixel area and a plurality of metal interconnection layers located in the non-pixel area are formed in the substrate; forming a deep trench isolation structure in the substrate of the pixel area, forming a metal grid on the substrate of the pixel area, the metal grid is located above the deep trench isolation structure, the deep trench isolation structure is located above the pixel electrode, and the metal grid close to the non-pixel area extends to the non-pixel area; forming a metal pad in the substrate of the non-pixel area, the metal pad is connected with the metal interconnection layer, and the metal pad is connected with the metal grid extending to the non-pixel area. According to the application, the metal grid is connected with the metal pad, so that a grounding hole is not needed to ground the metal grid, the use of a mask is reduced, the process steps are reduced, and the process cost is saved.

The invention discloses a non-staggered double-frequency bidirectional four-channel Janus metasurface, the metasurface is composed of periodically arranged unit structures, each unit comprises an upper resonator group, a middle metal grating layer and a lower resonator group which are separated by a dielectric substrate, and the upper resonator group and the lower resonator group have the same structure; each split ring comprises a large-size split ring and a small-size split ring, and frequency decoupling is achieved by means of resonance selectivity of the large-size split rings and the small-size split rings to different frequencies. The response asymmetry of the Janus structure to the positive and negative incident directions is utilized to realize direction decoupling; 1-bit phase regulation and control are realized by rotating the direction of the split ring, and independent wavefront control of four channels including dual frequency bands and two directions is realized on a single non-staggered metasurface; according to the invention, the problems of low unit utilization rate, serious inter-channel crosstalk and low function integration in the prior art are solved.

The invention relates to the technical field of semiconductor lasers, in particular to a tunable TFLN thin film lithium niobate ECL laser based on a top metal grating. The TFLN thin film lithium niobate optical waveguide is arranged on the right side of the optical gain chip and abuts against the right end face of the optical gain chip; the optical isolator is arranged on the right side of the TFLN thin film lithium niobate optical waveguide; the optical amplifier is arranged on the right side of the optical isolator; the spectroscope is arranged on the right side of the optical amplifier; the HR high reflection film is plated on the left end face of the optical gain chip; and the AR anti-reflection film is plated on the right end surface of the TFLN thin film lithium niobate optical waveguide. The invention has the following beneficial effects: 1, high integration level; 2, wide-range fast tuning is realized; 3, high stability and high power; the structure is simple, and machining is easy.

The invention relates to the technical field of semiconductor lasers, in particular to a laser based on a top plane metal grating and a high-reflection dielectric film, which comprises a gain chip, the left end face of the gain chip is plated with a first high-reflection HR film, and the right end face of the gain chip is plated with a first anti-reflection AR film; the right side of the gain chip is provided with a planar metal Bragg grating waveguide, the right end face of the gain chip is aligned and attached to the left end face of the planar metal Bragg grating waveguide, and the left end face of the planar metal Bragg grating waveguide is plated with a second anti-reflection AR film. The right end face of the planar metal Bragg grating waveguide is plated with a third anti-reflection AR film. Through the centimeter-level planar metal Bragg grating waveguide and the low-loss coupling structure, the narrow linewidth of less than 750Hz and the light beam quality of M2 less than 1.1 are realized.

The invention discloses a terahertz liquid crystal spatial light modulator with large modulation depth and ultra wide band, which belongs to the field of novel artificial electromagnetic materials and terahertz science and comprises an upper-layer quartz substrate, an upper-layer metal grating, an upper-layer pre-oriented film, a liquid crystal layer, a lower-layer pre-oriented film, a lower-layer metal grating and a lower-layer quartz substrate which are sequentially stacked and arranged, the upper-layer metal grating and the lower-layer metal grating are orthogonally arranged in space to form a Fabry-Perot cavity; the liquid crystal layer is filled between the upper pre-oriented film and the lower pre-oriented film, and the liquid crystal director has in-plane pre-orientation; the upper-layer metal grating and the lower-layer metal grating serve as a first electrode and a second electrode respectively and are used for receiving external voltage and controlling the liquid crystal director to be dynamically switched between an in-plane state and an out-of-plane state; according to the invention, the spatial modulation of the incident terahertz wave intensity can be realized, and the problems of photoelectric function conflict and pixel crosstalk of a metal structure are effectively solved.

The invention relates to the technical field of semiconductor lasers, in particular to a laser of an annular etching metal grating based on two different grating constants. The laser quantum well gain layer is arranged on the upper end surface of the substrate; the annular etching metal grating is arranged on an upper waveguide layer of the laser quantum well gain layer; the upper cladding is constructed above the annular etched metal grating through a semiconductor secondary epitaxy method; a top positive electrode; a bottom negative electrode; the AR anti-reflection interface is arranged at the laser output part of the annular etched metal grating, and the light output opening angle phi of the laser output part of the annular etched metal grating is larger than 0 degree and smaller than or equal to 360 degrees; and the HR high-reflection interface is arranged at a non-laser output part of the annular etched metal grating. The invention has the following beneficial effects: 1, all-solid-state large-angle output is realized; 2, high power output and high gain efficiency; 3, narrow linewidth characteristic and high wavelength purity; and 4, the structure is compact and the cost is low.

The application relates to the technical field of semiconductor lasers, in particular to an ultra-narrow linewidth tunable wavelength external cavity laser based on a planar metal grating, which comprises a gain chip, the left and right end faces of the gain chip are respectively coated with a high reflection film and a first antireflection film; a planar metal grating waveguide is arranged on the right side of the gain chip, the right end face of the gain chip is aligned and attached to the left end face of the planar metal grating waveguide, and the left and right end faces of the planar metal grating waveguide are respectively coated with a second antireflection film and a third antireflection film; the planar metal grating waveguide comprises a grating waveguide substrate, a back ridge optical waveguide is arranged on the upper portion of the grating waveguide substrate, a planar metal grating is arranged on the upper portion of the back ridge optical waveguide, and a top covering layer is arranged on the upper portion of the planar metal grating. Through the centimeter-level metal grating and the low-loss coupling structure, the application realizes a 3dB linewidth of less than 700Hz and a beam quality of less than 0.9. 2 ​

The present application relates to the technical field of optoelectronic devices, especially to a top HR layer and two interval lambda / 2 plane metal grating laser, comprising: a gain chip; an optical waveguide; a plane metal grating and a cover layer. The present application controls the phase difference between the plane metal Bragg grating one and the plane metal Bragg grating two to be lambda / 2, uses interference enhancement and mode suppression mechanism, improves the side mode suppression ratio (SMSR) to 63dB, compresses the line width to 0.6kHz, the plane metal grating adopts high reflectivity Cr / Au structure, the thermal expansion coefficient is low, which ensures the wavelength stability of the device in a wide temperature range, the top cover layer effectively prevents the loss of upward diffraction light energy, optimizes the light field distribution, replaces the traditional semiconductor secondary epitaxial waveguide layer to reduce the cost, does not need grating etching, and the grating accuracy is controllable and the flatness is good.

The utility model relates to the technical field of waste gas filtering type oil smoke purifiers, and discloses a waste gas filtering type oil smoke purifier which comprises a box body, an air inlet is formed in the front face of the box body, a filtering assembly is arranged in the box body, and the filtering assembly comprises a metal grating plate, a fiber base plate, an activated carbon plate, an exhaust pipeline and an exhaust filtering plate. Three sets of sliding grooves are formed in the inner wall of the box body, through the arranged filtering assembly, lampblack enters the box body through an air inlet hole and is subjected to triple filtering through a metal grating plate, a fiber base plate and an activated carbon plate in sequence, the metal grating plate intercepts large particles, the fiber base plate filters fine particulate matter, the activated carbon plate adsorbs harmful gas and peculiar smell molecules, and the filtered lampblack is purified. The oil smoke is fed into the exhaust pipeline through the exhaust fan, the exhaust pipeline guides the oil smoke to flow directionally and prevents the oil smoke from moving disorderly in the box body, then the centrifugal exhaust fan pushes the oil smoke to the exhaust filter plate, and the exhaust filter plate performs final fine filtration to ensure that exhausted gas is clean.

The utility model discloses a UHPC and honeycomb bridge pier composite ship collision prevention device which comprises an anti-collision box, an assembly inner cavity for containing an energy dissipation structure is formed in the anti-collision box, a steel lattice for dividing the inner space of the assembly inner cavity is arranged in the assembly inner cavity, and aluminum honeycomb plates connected in series and in parallel are arranged in the steel lattice. The steel lattice and the aluminum honeycomb plate form a combined energy dissipation structure. According to the series and parallel aluminum honeycomb plate-steel lattice combined structure, the defects that a single honeycomb structure is small in size and low in total energy consumption are overcome, and the high energy absorption efficiency of the honeycomb structure and the unbalance loading resistance of a metal grid structure are coupled; and the energy absorption effect on anti-collision scenes caused by different ship tonnages, different ship bow shapes and different collision directions and angles is good. According to the utility model, a series and parallel aluminum honeycomb panel-steel lattice combined structure is adopted as an energy dissipation structure, and the structure is stable in failure mode, strong in energy dissipation capacity, clear in force transmission path and controllable in design under dynamic impact compression.