Abstract: A phase-detection device and method for an optical element are provided, along the direction of the optical path the phase-detection device includes: a light source, a beam collimator, a diffraction element and an imaging detector; the optical element is set between the filter and the diffraction element; the diffraction element includes a mesh mask region and an array region segmented by the mesh mask region; mesh mask region blocks lights of a target wavelength; the array region includes a first class of cell and a second class of cell, and the first class of cell and the second class of cell are alternatively arranged; the first class of cell provides a first phase for the lights of target wavelength, and the second class of cell provides a second phase for lights of target wavelength; a phase difference between the first phase and second phase is T rad.

Abstract: A method for providing an enhanced estimate of reference barometric pressure. The method uses multiple, dissimilar pressure references, such as in airport weather stations, personal weather stations, and wireless terminals such as smartphones, in order to provide the enhanced estimate of reference barometric pressure. The method generates an enhanced estimate of reference barometric pressure based on a first estimate of reference barometric pressure from a first pressure reference network made up of airport weather stations, for example. The method also uses a second estimate of reference barometric pressure from a second pressure reference network made of up personal weather stations, for example, and a third estimate of reference barometric pressure, also from the second network. The first, second, and third estimates of reference barometric pressure are combined such that both measurement accuracy and timeliness are improved in the resulting, enhanced estimate.

Abstract: An optical system for ToF and a depth camera of ToF are provided, and the optical system including two optical elements. The two optical elements along the optical axis in order from an object side to an image side include: a filter and a metalens; each of two optical elements includes an object-side surface facing towards the object side and an image-side surface facing towards the image side; the metalens includes a substrate and a plurality of unit cells; and a plurality of nanostructures are set on a vertex and center of the unit cells of the metalens; the optical system includes an aperture slot, and the aperture slot is set on an incident direction of an optical path of the metalens; the optical system satisfies the following condition: f D ? 1.2 ; f is a focal length of the optical system, and D is an entrance pupil diameter of the optical system.

Abstract: An optical system and an optical camera are provided, and the optical system includes three optical elements. Along the optical axis in order from an object plane to an image plane, the three optical elements include: a first sulfur refractive lens, a metalens and a second sulfur refractive lens; each of three optical elements includes an object-side surface facing towards the object plane and an image-side surface facing towards the image plane; the first sulfur refractive lens and the second sulfur refractive lens are even aspheric optical lenses; the object-side surface of the first sulfur refractive lens is a convex surface; each of the object-side surface of the second sulfur refractive lens and the image-side surface of the second sulfur refractive lens includes one inflection point; the first sulfur refractive lens, the metalens and the second sulfur refractive lens have positive focal power.

Abstract: An optical system and an optical camera working at a far-infrared waveband are provided. The optical system includes two optical elements, the two optical elements being, along the optical axis in order from an object side to an image side: a metalens and a refractive lens; each of two optical elements including an object-side surface facing towards the object side and an image-side surface facing towards the image side; the metalens including a substrate and a plurality of nanostructures, and the plurality of nanostructures are set on the image-side surface of the metalens; when a light passes through the image-side surface of the metalens, the incident angle of the light is less than or equal to 45°; the object-side surface of the refractive lens is a concave surface, and the image-side surface of the refractive lens is a convex surface; and the refractive lens has positive refractive power.

Abstract: A hybrid lens and an optical system are provided, and the hybrid lens includes a first lens and a second lens in order from an object side to an image side; the first lens is a refractive lens with a positive focal length; the second lens is a metalens; both the object-side surface and the image-side surface of the first lens are aspheric surfaces; the first lens and the second lens further satisfy the conditions: t 12 ? 0.5 mm ; ? "\[LeftBracketingBar]" f 2 f 1 ? "\[RightBracketingBar]" ? 8 ; R 1 ? i > R 1 ? O .

Abstract: An optical system and an imaging device are provided, and the optical system includes six optical elements; in order from an object side to an image side, the six optical elements include: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; the first lens is an aspheric refractive lens, and the second lens is a metalens; all the third lens, the fourth lens, the fifth lens and the sixth lens are refractive lenses; from the image side to the object side, there is at least one aspheric surface in the surfaces of the third lens, the fourth lens, the fifth lens and the sixth lens, and the aspheric surface has one point of inflection; the first lens has a positive focal power, and the object-side surface of the first lens is a convex surface.

Abstract: An optical system and an imaging device are provided, and the optical system includes seven optical elements In order from an object side to an image side, the seven optical elements include: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; each of seven optical elements includes an object-side surface facing towards the object plane and an image-side surface facing towards the image plane; at least one optical element of the seven optical elements is a metalens, and other optical element are aspheric optical lenses; and from the image side to the object side, both the first aspheric optical lens and the second aspheric optical lens include at least one aspheric surface, and the aspheric surface includes one point of inflection.

Abstract: A metalens is provided, the metalens includes: a substrate, a plurality of structural units arranged in periodicity; and the structural units are perpendicular to the substrate; the metalens includes a plurality of phase-modulation regions, and each phase-modulation region includes the plurality of structural units; where, each structural unit includes m phase-modulation layers, m?2, so as to make each structural unit in each phase-modulation region provide any phase within the interval of [0,2?] and each phase-modulation region cover the phases within the interval of [0,2?] at a working waveband.

Abstract: An optical system and an optical camera working at a far-infrared waveband are provided, the optical system including three optical elements, the three optical elements being, along the optical axis in order from an object side to an image side: a first sulfur refractive lens, a metalens and a second sulfur refractive lens; the first sulfur refractive lens and the second sulfur refractive lens have positive refractive power; each of three optical elements including an object-side surface facing towards the object side and an image-side surface facing towards the image side; the metalens includes a substrate and a plurality of unit cells, and a plurality of nanostructures are set in the unit cells; the optical system satisfies the following condition with a unit of 1/mm: 0.25 ? n * ( ? "\[LeftBracketingBar]" C 1 ? "\[RightBracketingBar]" + ? "\[LeftBracketingBar]" C 2 ? "\[RightBracketingBar]" ) ? 2 ? .01 .

Abstract: A system of a tunable metasurface is provided, and the system of a tunable metasurface includes: a wavefront modulator, an optical focusing device, a metasurface; the metasurface includes a plurality of nanostructures made of a phase change material, and a phase change state of the phase change material comprises a crystalline state and an amorphous state; the wavefront modulator is set on a side of the optical focusing device that is far away from the metasurface; and the wavefront modulator is used to modulate a wavefront aberration of incident control lights and emit the control lights after wavefront modulated towards the optical focusing device; the optical focusing device is used to focus wavefront-modulated control lights to form a plurality of focal points; the metasurface is set on a focal plane formed by the plurality of focal points.

Abstract: A pixel structure is provided, and the pixel structure includes a plurality of phase change units, and the plurality of phase change units are in identical; the plurality of phase change units are arranged in an array; each phase change unit includes an excitation element and a phase change element, and the excitation element is used for applying independent excitation to the phase change element to change a phase state of the phase change element; each phase change element comprises at least one nanostructure made of a phase change material; the phase state of the phase change element includes a crystalline state or an amorphous state; the phase change state of the pixel structure is related to the number of phase change units containing different phase change states.

Abstract: An optical system and an optical camera working at a far-infrared waveband are provided, the optical system along the optical axis from the objection side to the image side includes: a metalens and a spherical lens; the metalens is configured to correct higher-order residual wavefront aberrations; the spherical lens is configured to correct lower-order primary wavefront aberrations; the metalens and the spherical lens are configured to correct aberrations; an absolute value of the curvature radius of an objection-side surface towards the objection side for the spherical lens is greater than an absolute value of the curvature radius of an image-side surface towards the image side for the spherical lens; the optical system satisfies the following condition: 0.83?f/D?0.92; where f is an effective focal length of the optical system, and D is the entrance pupil diameter of the optical system.

Abstract: A method for designing a metalens used for an image sensor and an image sensor is provided, the method includes: S1. determining a target waveband; S2. according to the target waveband, determining an initial structure parameter and an initial material parameter of the unit cells; S3. optimizing the initial structure parameters of the unit cells and the initial material parameters of the unit cells, so as to obtain target parameters of unit cells; the target parameters of unit cells comprise: a phase of the unit cells and transmittance of the unit cells for an oblique incident light; S4: determining whether the transmittance of the metalens with the target structure parameter of unit cells meets the target transmittance.

Abstract: A design method for a metalens, a metalens, a shaping and beam-combination device and a display device are provided, when Gaussian beams passes through the metalens, the Gaussian beams are shaped into a plurality of flat-topped beams that project to a target position on a target plane. The method includes: determining an incident parameter, and the incident parameter includes wavelengths and radius of the plurality of Gaussian beams; determining an outgoing parameter, and the outgoing parameter includes a width of flat-topped beams; setting metalens portions on the metalens and determining a position of each metalens portion; the metalens portions and the Gaussian beams are one-to-one correspondence, calculating a modulation phase distribution according to the incident parameter, and the outgoing parameter and the position of each metalens portion; arranging unit cells on the metalens portions according to the modulation phase distribution, and obtaining the metalens.

Abstract: A battery pack cooling system includes at least a cooling fluid including a plurality of cooling fluid circulation pipelines and at least an electronic water pump, a refrigeration element, a heat exchange element, a thermal runaway sensing element, and a fluid diversion assembly. The electronic water pump is configured to be communicatively connected to a controller of a vehicle and is arranged on the pipelines. the refrigeration element communicates with the cooling fluid circulation pipelines. the heat exchange element communicates with the pipelines. The thermal runaway sensing element is configured to be communicatively connected to the controller. The fluid diversion assembly includes a fluid guide channel and a fluid diversion valve. The fluid diversion valve is set as a multi-way solenoid valve, and has at least two interfaces configured to communicate with the pipelines, and at least one interface communicating with one end of the fluid guide channel.

Abstract: A MTF detection device for wafer-lever optical elements is provided, the MTF detection device for a wafer-level optical element include a luminescent target, a mobile disc, an adjustable bracket, and a detection device. The plurality of luminescent targets are movable along the direction of the light path. The mobile disc is set up with a placing area and the mobile disc is movable, so as to locate different locations of the placing area on the extension of the central line of the luminescent target by moving the mobile disc. The distance between the adjustable bracket and the luminescent target is adjustable, and an external processing assembly is located on a first side of the adjustable bracket. The detection device is installed over the adjustable bracket, and is used to receive the light emitted from the luminescent target through the sample to be detected and the external processing assembly.

Abstract: A lens for ToF is provided, the lens includes: an optical system and a lens barrel; and the optical system is confined within the lens barrel. The optical system includes: an aperture slot, an optical filter, and a metalens. The aperture slot, the optical filter and the metalens are disposed sequentially from the object side to the image side, and the total track length of the optical system is less than or equal to 3.1 mm.

Abstract: Provided is a metasurface, a design method, a design device, an electronic device and a fabrication method. An antireflection film is covered on the metasurface; the metasurface includes: a substrate; the substrate includes: a first side; and the first side of the substrate has a plurality of negative nanostructures at different locations, and the depth of the plurality of negative nanostructures is less than the thickness of the substrate; the antireflection film is covered on the surface of the first side of the substrate without the plurality of negative nanostructures.

Abstract: A method for providing an enhanced estimate of reference barometric pressure. The method uses multiple, dissimilar pressure references, such as in airport weather stations, personal weather stations, and wireless terminals such as smartphones, in order to provide the enhanced estimate of reference barometric pressure. The method generates an enhanced estimate of reference barometric pressure based on a first estimate of reference barometric pressure from a first pressure reference network made up of airport weather stations, for example. The method also uses a second estimate of reference barometric pressure from a second pressure reference network made of up personal weather stations, for example, and a third estimate of reference barometric pressure, also from the second network. The first, second, and third estimates of reference barometric pressure are combined such that both measurement accuracy and timeliness are improved in the resulting, enhanced estimate.