14 results about "Periodic nanostructures" patented technology

Systems, methods, and media for calibrating a scanning electron microscope (SEM). The system includes a processor and a memory. The memory stores instructions that, when executed by the processor, configure the system to perform operations. An electron microscope image of a periodic structure is generated by the SEM. A Fourier transform of the electron microscope image is computed to generate a spectrum. Reciprocal lattice vectors are computed based on a known periodicity of the periodic structure. A pixel mask is generated based on the reciprocal lattice vectors and applied to filter the spectrum. A quality metric is generated based on an aggregate magnitude of the filtered spectrum and a magnitude of a zero-frequency component of the filtered spectrum. A pixel scaling parameter, focus parameter, and / or stigmation parameter of the SEM are determined based on the quality metric.

The invention discloses a preparation method of a flexible infrared super-surface absorber based on MDM, and belongs to the field of micro-nano machining patterning. The method comprises the following steps: pretreating a polymer material; depositing a layer of bottom metal film on the pretreated substrate by adopting magnetron sputtering; a metal reflecting layer, a dielectric insulating layer and a metal surface functional layer are sequentially deposited through magnetron sputtering, a periodic nano microstructure is constructed on the surface of a flexible composite film, a nano round pit array is etched in situ on a surface metal layer of an MDM structure by using a femtosecond laser selective etching process, and an MDM laminated structure is formed. According to the invention, stable integration of the MDM structure and the flexible substrate can be realized, and meanwhile, high absorptivity and good flexibility of the device in an infrared band are ensured. The absorber prepared by the invention can generate resonance absorption on incident infrared electromagnetic waves through a surface plasmon and F-P cavity resonance coupling mechanism, and meanwhile, the characteristic size variation is changed through physical excitation, so that effective absorption and frequency regulation of the electromagnetic waves at the infrared band of 3-14 microns are realized.

The application provides a yttrium barium copper oxide photonic crystal and a preparation method thereof. 7‑x The photonic crystal structure is composed of periodic yttrium barium copper oxide (YBa2Cu3O 7‑x ) superconducting material circular crystal columns, the lattice constant is 2630nm, and the radius of the circular crystal column is 500nm. The photonic crystal can change the position and width of the band gap by changing the light incidence angle, so that the middle infrared band gap is realized. The photonic crystal is prepared by adopting a magnetron sputtering method to prepare a yttrium barium copper oxide film on a strontium titanate single crystal substrate, and then adopting a focused ion beam method to process the yttrium barium copper oxide film into a periodic nanostructure composed of yttrium barium copper oxide circular crystal columns, so that the yttrium barium copper oxide photonic crystal is obtained. The preparation method of the yttrium barium copper oxide photonic crystal is simple and easy to control.

The invention provides a sensing device based on a stretchable metasurface and a heavy metal ion sensing method, and belongs to the technical field of optical sensing. The device comprises a flexible stretchable substrate and an optical metasurface arranged on the flexible stretchable substrate, a periodic nanostructure of the device can spontaneously suck liquid to be measured through the capillary effect, and meanwhile the metasurface period can be changed by stretching the substrate so as to tune the wavelength of an optical formant. The method comprises the following steps: applying strain to tune wavelength, introducing liquid to be measured to spontaneously fill, collecting spectrum and analyzing spectrum characteristics to determine the heavy metal ions. According to the invention, through integration of mechanical tuning and capillary sampling functions, the existing technical problems are solved, multi-dimensional detection based on wavelength selection and spectral line analysis is realized, and the device has the beneficial effects of high selectivity, high sensitivity, portability and capability of realizing multi-ion parallel detection.

This invention relates to the field of nuclear detection technology, and more particularly to a method for improving light output based on different arrangements of conical structures. The method includes: constructing a periodic nanostructure array on a crystal surface to form a refractive index gradient interface to improve light extraction efficiency; the periodic nanostructure array is divided into tetragonal and hexagonal arrangements; establishing a physical model using the FDTD algorithm, while setting boundary conditions and light source types that conform to the physical conditions of perovskite luminescence; analyzing the influence of the two arrangements on transmittance using the scanning function of FDTD under a specific wavelength light source; iteratively optimizing the geometric parameters with a preset light transmittance using FDTD optical simulation combined with a particle swarm optimization algorithm; and evaluating the convergence of the particle swarm optimization. This invention solves the problem of low light extraction efficiency in existing technologies and has the advantages of strong structural inherentness, superior optical performance, and applicability to radiation detectors and other devices.

Systems, methods, and media for calibrating a scanning electron microscope (SEM). The system includes a processor and a memory. The memory stores instructions that, when executed by the processor, configure the system to perform operations. An electron microscope image of a periodic structure is generated by the SEM. A Fourier transform of the electron microscope image is computed to generate a spectrum. Reciprocal lattice vectors are computed based on a known periodicity of the periodic structure. A pixel mask is generated based on the reciprocal lattice vectors and applied to filter the spectrum. A quality metric is generated based on an aggregate magnitude of the filtered spectrum and a magnitude of a zero-frequency component of the filtered spectrum. A pixel scaling parameter, focus parameter, and / or stigmation parameter of the SEM are determined based on the quality metric.

This invention provides a method for preparing axially periodic core-shell heterojunction nanostructures. First, Al-M nanowires with endpoints are obtained using a catalytic growth method. Then, the endpoints A1 of the Al-M nanowires are removed using alkylphosphine to obtain pure colloidal M nanowires. Next, a silver source solution is mixed with a dispersion of the pure colloidal M nanowires for an ion exchange reaction to obtain M@A2 uniform core-shell heterojunction nanowires. Finally, the M@A2 core-shell nanowires are dispersed in a solvent and subjected to heat treatment. The Rayleigh fluid instability in inorganic solids causes deformation, leading to structural evolution of the uniform core-shell heterojunction nanowires and the formation of axially periodic core-shell heterojunctions. Compared with existing technologies, this invention is the first to utilize the principle of Rayleigh fluid instability in inorganic solids to precisely synthesize axially periodic nanostructures with adjustable size and periodicity, opening a new avenue for the design and synthesis of axially periodic nanostructures.

The invention discloses a bionic photonic crystal composite material and a preparation method and application thereof, and belongs to the technical field of agricultural functional nanomaterials, the bionic photonic crystal composite material comprises a bionic structure matrix and a light energy conversion unit, the bionic structure matrix is a material with a periodic nanostructure, and the light energy conversion unit is a material with a periodic nanostructure. The lattice constant of the periodic nanostructure is 100-300 nm, so that the periodic nanostructure forms a one-dimensional photonic crystal and has a photonic band gap effect; the light energy conversion unit is modified on the surface of the bionic structure matrix or embedded in the bionic structure matrix, and the light energy conversion unit can absorb wave bands with low utilization rate of crop leaf cuticles and convert the wave bands into wave bands with high utilization rate. According to the bionic photonic crystal composite material disclosed by the invention, the light energy utilization rate and the photosynthetic electron transfer rate (ETR) of crops under weak light are remarkably improved.

The invention discloses an III-nitride device and a preparation method thereof, and relates to the technical field of sensors. The device sequentially comprises a substrate, a buffer layer, a channel layer, a barrier layer and a first gas-sensitive layer from bottom to top, wherein the first gas-sensitive layer has a periodic nano structure. According to the structure, high-density gas adsorption sites are provided on the surface, and active photon-generated carriers are generated through a geometric confinement effect under the assistance of illumination. And the photo-generated carriers promote gas molecules to generate an oxidation-reduction reaction, so that the concentration of two-dimensional electron gas (2DEG) at a channel of the III-nitride device is effectively regulated and controlled, and the current of the device is remarkably changed. According to the device provided by the invention, the first gas sensitive layer with the periodic nanostructure is utilized to catalyze the gas reaction and the synergistic effect of 2DEG, so that high-sensitivity, quick-response and low-detection-limit gas detection is realized.

The invention provides a sensitive-response graphene stress sensor and a preparation method thereof, and relates to the technical field of graphene stress sensors. The sensor comprises a flexible light-emitting layer and a photonic lattice gel layer connected with the flexible light-emitting layer, a photonic crystal with a periodic nanostructure is embedded in the photonic lattice gel layer; when the photonic lattice gel layer is stretched, the lattice constant of the photonic crystal of the periodic nanostructure in the photonic lattice gel layer is stretched, and the wavelength of reflected light moves towards the long wave direction; when the photonic lattice gel layer is compressed, the lattice constant is reduced, and the wavelength of the reflected light moves towards the short wave direction; the graphene heterojunction light sensor is connected with the photonic lattice gel layer, the flexible light-emitting layer serves as a light-emitting source, light emitted by the flexible light-emitting layer is transmitted to the graphene heterojunction light sensor through the photonic lattice gel layer, and the graphene heterojunction light sensor collects the intensity and spectrum of transmitted light. And analyzing the intensity of the transmitted light and the strain of the spectrum sensing effect on the graphene stress sensor with sensitive response.

The invention belongs to the related technical field of non-invasive human eye intraocular pressure measuring equipment, and discloses a soft sensing lens based on a double-layer grating sensor, the soft sensing lens comprises a lens and a double-layer grating sensor arranged in the lens, the lens comprises an inner concave surface used for fitting an eyeball and an outer surface facing air; the double-layer grating sensor is integrated on the outer surface; the double-layer grating sensor comprises a packaging layer, an air layer, a thin film layer, a grating layer and a substrate which are sequentially arranged from top to bottom. The grating layer is a layer of periodic nanostructure grating, and the stripe section of the grating layer is rectangular or isosceles trapezoid; the thin film layer is a high-refractive-index thin film covering the grating layer; while a more complex and precise optical sensing structure is integrated, the bandwidth of a diffraction spectrum can be effectively increased, the measurement stability, the actual durability and the wearing comfort of equipment in the experiment process are improved, and a guarantee is provided for obtaining reliable intraocular pressure dynamic data.

Provided are a nanoscale geometrical quantity certified reference material, and a preparation method and use thereof, belonging to the technical field of nano-scale measurements. The nanoscale geometrical quantity certified reference material includes a substrate and a periodic nanostructured two-dimensional supramolecular film attached to the substrate, where the periodic nanostructured two-dimensional supramolecular film is formed by self-assembly of 5,5′-(9H-fluorene-2,7-diyl)diisophthalic acid and 1,2-bis(4-pyridyl)ethane. Provided is also a preparation method of the nanoscale geometrical quantity certified reference material. The self-assembly is a bottom-up process to prepare a periodic nanostructured two-dimensional supramolecular film.

This invention discloses a fabrication process for a biomimetic moth-eye structure for anti-glare on glass surfaces, relating to the field of anti-glare technology for glass. Specifically, the fabrication process includes a biomimetic moth-eye structure and a processing technique. The processing technique includes a laser pretreatment stage, a chemical etching stage, and a post-processing stage. The laser pretreatment stage induces periodic nanostructures on the glass surface using femtosecond or picosecond lasers. This fabrication process for the biomimetic moth-eye structure for anti-glare on glass surfaces, through laser-induced chemical etching, successfully solves the problems of complex fabrication processes, high costs, and easy structure detachment in biomimetic moth-eye structure glass. It provides a feasible solution for the large-scale production of super anti-glare glass. This technology not only has significant advantages in optical performance but also possesses excellent mechanical stability and self-cleaning function, making it suitable for various display, photovoltaic, optical, and architectural fields.

The application discloses a kind of microcavity optical comb device and driving method based on double-ring coupling structure, the device includes pump laser, main optical microcavity, auxiliary optical microcavity and tuning unit;Main optical microcavity generates dissipative kerr soliton optical frequency comb under the excitation of pump light, auxiliary optical microcavity is coupled with main optical microcavity, and is provided with periodic nanostructure thereon, backscattering is generated to pump light with frequency in the resonance bandwidth of pump mode, so that pump laser realizes self-injection locking;Coupling between auxiliary optical microcavity and main optical microcavity induces mode splitting at pump mode, and transmission of pump light from main optical microcavity is inhibited;Tuning unit is arranged on auxiliary optical microcavity, for adjusting the resonance frequency of auxiliary optical microcavity and the degree of mode splitting.The application can realize the robustness of self-injection locking and the high conversion efficiency of soliton optical comb simultaneously without damaging the high Q value characteristics of main microcavity.