56 results about "Surface grating" patented technology

The present invention relates to a transmission grating and a preparation method therefor. The transmission grating comprises: a substrate, which has a first surface; a grating layer, which comprises trapezoidal grating teeth arranged in an array on the first surface, wherein the grating teeth extend in the direction of thickness of the substrate, and a gap is provided between two adjacent grating teeth; and a dielectric layer, which is arranged on a surface of the grating layer and fills the gaps, wherein the dielectric layer has a second surface on the side thereof away from the substrate; there is a difference between the height of the grating teeth and the distance between the second surface and the first surface, the difference being m; and incident light passes through the interior of the grating layer and is incident towards the second surface. By means of the design of a film layer structure and film layer dimensions of the transmission grating, the present invention can acquire transmission gratings having different diffraction efficiencies and polarization degrees, and can accurately control the dimensions of the film layer structure of the transmission grating during machining, thereby facilitating machining.

This application discloses a method and system for synchronous testing of metasurface grating waveguide performance, relating to the field of metasurface grating technology. The method includes polarization state modulation and spatial frequency encoding of multi-wavelength incident beams to obtain a modulated incident light field; coupling this modulated incident light field into the metasurface grating waveguide under test, which then undergoes total internal reflection to form the outgoing light field; acquiring a raw dataset of the entire light field, including Stokes polarization images and spatial spectrum images corresponding to each wavelength of the outgoing beam; calculating the total internal reflection hop count based on the Stokes polarization image; calculating the spatial step size offset based on the spatial spectrum image; and establishing a mapping relationship between the image pixel coordinates of the raw dataset and the internal physical regions of the metasurface grating waveguide under test to obtain local diffraction efficiency distribution data. This application solves the problem that traditional outgoing end intensity testing is difficult to trace to local defects inside the waveguide, achieving synchronous, high-precision quantitative characterization of local diffraction efficiency across multiple wavelengths.

The embodiment of the invention relates to a surface emitting laser and a light emitting unit. The surface emitting laser includes: a substrate; the bottom reflector structure, the active layer and the top reflector structure are arranged on the substrate; the at least two surface grating units are formed on the surface of the top reflecting mirror structure and located in a lasing area of the surface emitting laser, and each surface grating unit is configured to enable the polarization selection mode of at least one surface grating unit to be different from the polarization selection modes of the other surface grating units. According to the scheme, emission and polarization control of non-fundamental mode laser can be restrained in a targeted mode, selective single / multi-mode stable output is achieved, and the mode hopping phenomenon is reduced.

Extended cavity diode laser devices and methods of fabrication are provided, wherein the diode laser devices comprise, in the longitudinal direction, an amplifier section, a passive propagation section, and a Bragg section. The amplifier section, the propagation section, and the Bragg section are arranged between a front facet and a rear facet, wherein an active layer is formed in of the amplifier section over the entire length of the amplifier section and, in the Bragg section, a surface grating extends over the entire length of the Bragg section, and the surface grating is formed by a plurality of grooves spaced apart from each other in the longitudinal direction.

The present disclosure relates to highly efficient curved holographic aligned nonlinear grating elements (CHANGE) for high-resolution high-performance augmented and virtual reality. In embodiments, a curved shape can be designed by input angle and output angle for each position of the CHANGE. Each position has a different grating direction (x) and a different period. For AR devices, two-dimensional image sources from the displays can be used. Thus, CHANGES can be applied for both in-coupling and out-coupling diffractive metasurface optical elements (MOEs) instead of using a two-dimensional grating. In the in-coupling MOE region, collimated display input source can be diffracted and guided into waveguide glass and magnified for both of the two-dimensional directions at the out-coupling region by using in-coupling CHANGE. In an out-coupling MOE region, a magnified two-dimensional image is focused at the eyebox by using out-coupling CHANGE. Thus, using CHANGE components according to embodiments, various sizes of input two-dimensional image sources can be converted to target sizes of two-dimensional images at the eyebox with high efficiency.

The invention relates to the technical field of semiconductor lasers, in particular to a dual-wavelength semiconductor laser based on grating width modulation and a preparation method thereof, and the laser comprises a ridge waveguide and a surface grating arranged on the ridge waveguide; the surface grating has a single fixed period; the laser comprises a first lasing area and a second lasing area along the cavity length direction, and the grating width of the first lasing area is different from that of the second lasing area; at least one isolation groove is formed between the first lasing area and the second lasing area; the first lasing area and the second lasing area are respectively provided with a first electrode and a second electrode. Through optimization of the structure and the process, the dual-wavelength light source integrates dual wavelengths, power stability and manufacturing feasibility, and is suitable for a light source for Raman detection.

The invention relates to polymerizable liquid crystal compositions (as a subcategory of liquid crystal materials) comprising an alignment additive, which are preferably PFAS-free (for enabling the reduction of perfluorocarbons and providing an environment friendly material), to formulations, polymers and polymer films obtained from such compositions, and to the use of the compositions, formulations, polymers and polymer films in optical or electrooptical components or devices, especially for digital optics or augmented reality or virtual reality (AR / VR) applications like polarizers, optical compensators, reflective films, diffraction or surface gratings, Bragg polarization gratings (Bragg PG), polarization volume gratings (PVG), polarization volume holograms (PVH), Pancharatnam Berry (PB) gratings, nonmechanical beam steering elements, optical waveguides, optical couplers, optical combiners, polarization beam splitters, partial mirrors, lenses or PB lenses.

This invention provides a photosensitive polyurethane film with a surface grating, its preparation method, and its applications. The photosensitive polyurethane film with a surface grating exhibits well-defined and controllable photoresponse characteristics. Its core mechanism lies in the photosensitive monomer responding to light stimulation of a specific wavelength through a dimerization reaction: under ultraviolet light irradiation, the photosensitive monomer in the film undergoes a [2+2] cycloaddition to generate a four-membered cyclobutane dimer. This response mechanism is clear, the triggering path is independent, and the response efficiency is high. It effectively overcomes the limitations of existing coumarin derivatives, which can only achieve self-healing technology. By controlling parameters such as irradiation time and number of irradiations, multi-dimensional information storage can be achieved, significantly improving information storage capacity and stability. This effectively solves the urgent problem of high-capacity information storage in the current field of optical encryption materials, providing a feasible technical path for improving the performance and expanding the practical applications of optical encryption materials.

A diffractive optical element comprising at least one achromatic half-wave plate and at least one chromatic half-wave plate, each half-wave plate comprising at least two layers of a polymerized chiral liquid crystal (LC) material on a substrate, wherein at least one of the substrates has a periodic surface grating, a method for its preparation. Also, its use in optical or electrooptical components or devices, especially for digital optics or augmented reality or virtual reality (AR / VR) applications like non-mechanical beam steering elements, optical waveguides, optical couplers, optical combiners, optical deflectors, polarization beam splitters, partial mirrors or lenses.

The invention discloses a GaN-DFB laser based on a porous gallium nitride coating layer and a preparation method, and belongs to the field of semiconductor lasers, and the GaN-DFB laser sequentially comprises a substrate layer, a bottom GaN layer, a GaN-n layer, a porous GaN layer, a lower intrinsic GaN layer, a quantum well active layer, an upper intrinsic GaN layer, an AlGaN-p barrier layer and a GaN-p layer from bottom to top. Porous GaN which is low in refractive index and controllable is used as a coating layer, the grating is formed through surface etching, the grating structure and the layer structure are optimized, the active layer and the surface grating layer can have high resonance light field coupling strength at the same time, low-threshold, efficient and high-performance light lasing can be achieved, and the light emitting efficiency is improved. Therefore, the novel GaN-DFB laser is prepared.

The invention provides an infrared eye movement tracking device and eye movement tracking equipment, and relates to the technical field of eye movement tracking. The device comprises a single infrared light emitting diode, a collimating element, a metasurface device, an image sensor and a control processing unit. The metasurface device is arranged on the light emitting path of the collimating element and located between the infrared light emitting diode and the human eye observation area; the metasurface device is a device designed based on a two-dimensional metasurface grating structure and is configured to diffract and modulate an incident light beam into a plurality of illumination light beams separated in space so as to form a plurality of light spots distributed in a concentric ring shape on the cornea surface of a target eyeball; the image sensor is used for collecting a cornea reflection image containing a plurality of light spots; and the control processing unit is in communication connection with the image sensor and is used for outputting sight line direction data based on the relative position relationship between a plurality of light spots in the cornea reflection image and the pupil center, so that the eye movement tracking performance with higher precision and higher reliability is realized while hardware is simplified.

The invention provides an extreme ultraviolet collection mirror grating hybrid measurement system and method, and relates to the technical field of extreme ultraviolet (EUV) lithography and nanometer metrology, and the system comprises an atomic force microscopic module which is in communication connection with a data processing module and is used for carrying out high-resolution morphology detection on an abnormal morphology according to position information, and obtaining image data; the shared precision positioning platform module is connected with the optical scattering measurement module and the atomic force microscopy module and used for controlling movement of the optical scattering measurement module and the atomic force microscopy module so that the atomic force microscopy module can accurately move to the position where the abnormal morphology is located; wherein the data processing module is also used for generating a comprehensive detection report based on the geometric structure parameters reconstructed by the optical scattering measurement module and the image data acquired by the atomic force microscopic module. According to the invention, high-precision, high-efficiency, cross-scale and lossless comprehensive characterization of the grating on the surface of the EUV collecting mirror can be realized.

The invention discloses a metasurface grating waveguide based on a silicon carbide substrate and an enhanced display system, and belongs to the technical field of optoelectronic device manufacturing, and the key points of the technical scheme are that the metasurface grating waveguide comprises a tunable light source, a spatial light modulator, a metasurface grating waveguide, an imaging device and a processing device, modulating the phase distribution of the light to obtain a light beam carrying image information; the processing device is used for adjusting the wavelength of light emitted by the tunable light source and the length of an optical resonant cavity according to the current temperature, and the optical resonant cavity is located in the tunable light source; the metasurface grating waveguide comprises a silicon carbide substrate and is used for conducting a light beam emitted by the focusing lens to the pupil expander so that the pupil expander can output image information to human eyes, the length of the outer cavity is adjusted firstly so that the longitudinal mode frequency can be aligned with the gain peak corresponding to the target wavelength, then the current is adjusted so that the wavelength can reach the target wavelength, and therefore image information can be obtained. The problem of uneven final imaging brightness can be solved while mode hopping is avoided.

The invention discloses a surface grating and a preparation method thereof, and a surface emitting laser with the surface grating, and the preparation method of the surface grating comprises the steps: after growing a functional semiconductor layer on a light-emitting epitaxial layer, etching a large-spacing first scribed line matrix through a fixed-precision photoetching device, and then utilizing a mask plate movement or laser angle adjustment technology to obtain a second scribed line matrix; and performing secondary etching on a second scribed line matrix with small spacing between the adjacent first scribed lines to form the double-layer nested grating. According to the method, the limitation of the precision of photoetching equipment on the grating spacing is broken through through process innovation, and sub-wavelength grating preparation can be realized without replacing high-cost and high-precision equipment.

The application discloses a surface grating and a preparation method thereof, and a surface emitting laser with the surface grating. The preparation method comprises the following steps: after growing a functional semiconductor layer on a light-emitting epitaxial layer, first etching a first matrix of first etching lines with a large interval by using a fixed-precision photoetching device, and then etching a second matrix of second etching lines with a small interval between adjacent first etching lines by using a mask moving or laser angle adjusting technology, so as to form a double-layer nested grating. The application breaks through the limitation of the precision of the photoetching device on the grating interval through process innovation, and subwavelength grating preparation can be realized without replacing high-cost high-precision equipment.

The application discloses a super surface grating waveguide based on a silicon carbide substrate and an enhanced display system, and belongs to the technical field of optoelectronic device manufacturing, and the technical scheme is characterized by comprising a tunable light source, a spatial light modulator, a super surface grating waveguide, an imaging device and a processing device, the spatial light modulator is used for receiving light emitted by the tunable light source, modulating the phase distribution of the light, and obtaining a light beam carrying image information; the processing device is used for adjusting the wavelength of the light emitted by the tunable light source and the length of an optical resonant cavity according to the current temperature, the optical resonant cavity is located in the tunable light source; the super surface grating waveguide comprises a silicon carbide substrate and is used for conducting the light beam emitted by a focusing lens to a pupil expander, so that the pupil expander outputs image information to a human eye, and the application can avoid mode jumping and solve the problem of uneven final imaging brightness by adjusting the length of an external cavity first, aligning the gain peak corresponding to the target wavelength of the longitudinal mode frequency, and then adjusting the current to make the wavelength reach the target wavelength.

The present application relates to a kind of elements providing clear sky effect, can be used to be attached in the light emitting surface of light source, including grating structure, the grating structure includes base, and grating component, grating component is arranged on the surface of the base, grating component includes: at least two spacers, spacer is spaced apart along the first direction, the orthogonal projection of any two spacers on base does not intersect, wherein the spacer is blue structure that can be transmitted and / or reflected;Light transmission channel, light transmission channel is formed between two spacers, wherein the end of light transmission channel close to the light source is light entrance, and the other end is light exit;Wherein, the light emitted by light source enters the light transmission channel from light entrance, part of the light entering light transmission channel is emitted from light exit, part penetrates spacer and forms blue light emission.The present application can realize clear sky effect, and without needing to reconstruct the structure of lamp, it is suitable for various different use scenarios.

An optical lens system and a spectrometer. The optical lens system comprises a dispersion element (20) arranged on a beam propagation path. The dispersion element (20) comprises at least one grism, and the grism includes a prism and a metasurface grating. The prism includes an incident surface, a reflective surface, and an exit surface, which are sequentially arranged on a beam propagation path. The grating is arranged on the incident surface or the exit surface. By combining the prism with the metasurface grating, the grating diffraction efficiency is increased, excellent dispersion performance is achieved, and the volume of an optical lens system can also be reduced.

A multi-twist waveplate comprising at least two layers of a polymerized chiral liquid crystal (LC) material on a substrate containing a surface grating, a method for its preparation, and its use in optical or electrooptical components or devices, especially for digital optics or augmented reality or virtual reality (AR / VR) applications like non-mechanical beam steering elements, optical waveguides, optical couplers, optical combiners, polarization beam splitters, partial mirrors or lenses.

The application relates to the technical field of super surface grating, and discloses a diffraction efficiency and field of view angle synchronous testing system and method of a super surface grating waveguide, which comprises the following modules: a light source module, which encodes the phase and frequency of a light beam through a complex coding method to obtain an incident light beam in response to a preset target field of view angle range; a diffraction module, which divides the super surface grating waveguide into multiple sub-regions, inputs the incident light beam into each sub-region for diffraction, and collects each sub-region diffraction light beam diffracted by the super surface grating waveguide; a parameter coupling module, which respectively performs coupling calculation on multiple parameters in each sub-region diffraction light beam through a parameter coupling method to generate a coupling matrix; and a decoupling analysis module, which decouples the coupling matrix through a preset parameter decoupling model to obtain the diffraction efficiency and field of view angle of the super surface grating waveguide. The application can realize high-precision synchronous measurement of the diffraction efficiency and field of view angle of the super surface grating waveguide.

The application discloses a single-surface grating aluminum frame glass door and an assembling method thereof, and relates to the technical field of aluminum frame glass door structures. The glass door comprises a glass piece. The assembling component comprises four side frames which are respectively connected to the upper side, the lower side, the left side and the right side of the glass piece, and the first ends and the second ends of the four side frames are connected. A first connecting piece is arranged between the side frame and the glass piece. A grating component is arranged on the front side of the glass piece, and the grating component comprises a plurality of vertical gratings and two horizontal gratings. The horizontal gratings are attached to the glass piece, and the two ends of the horizontal gratings are respectively connected to the first connecting pieces arranged on the left side and the right side of the glass piece. The vertical gratings are connected to the horizontal gratings through adhesive tape, and the two ends of the vertical gratings are respectively connected to the first connecting pieces arranged on the upper side and the lower side of the glass piece. The single-surface grating aluminum frame glass door can solve the problems of grating shaking and abnormal sound, and the number of horizontal gratings is reduced. The design is ingenious, the assembling is convenient, and the whole glass door is more beautiful and elegant.

The application discloses a display device, which is used for simplifying the complexity of the optical system of the display device and reducing the size and volume of the display device. The display device provided by the embodiment of the application comprises a light guide element, an image source assembly embedded in the light guide element in the thickness direction of the light guide element, and a first metasurface grating located on the light exit surface of the light guide element; the thickness direction of the light guide element intersects the light exit surface; the image source assembly comprises a display and a second metasurface grating; the second metasurface grating is located between the light exit side of the display and the side surface of the light guide element; and the second metasurface grating is used for making the light emitted by the display totally reflect and transmit in the light guide element; and the first metasurface grating is used for converging the light emitted from the interface between the light guide element and the first metasurface grating.

The application provides a surface grating surface emitting laser, comprising: an N-face metal electrode layer; an N-face waveguide layer, an active layer, a P-face waveguide layer and a ridge waveguide layer are sequentially stacked on the N-face metal electrode layer, wherein the ridge waveguide layer comprises a gain region and a loss region; a P-face metal electrode layer is arranged on the gain region of the ridge waveguide layer; and a P-face silicon dioxide layer is arranged on the loss region of the ridge waveguide layer. The laser is characterized in that the mode field is distributed in the loss region and the gain region after the PT symmetry is broken, so that the light field is realized to be emitted on the surface through the vertical diffraction coupling of the surface grating of the loss region, which is different from the common laser structure that all grating is etched in the longitudinal direction and electrodes are made on both sides. Through the PT symmetry manufacturing mode gain difference, the double lobes are eliminated, the single mode is stabilized, the λ / 4 phase shift is not needed to be introduced, and the process difficulty is reduced.

The present invention relates to reactive mesogens (RMs) with high birefringence and low absorption, RM mixtures and formulations comprising such RMs (as subspecies of liquid crystal materials), polymers and polymer films obtained from such RMs and RM mixtures, and the use of such RMs, RM mixtures, formulations, polymers and polymer films in optical or electro-optical components or devices, this use is particularly for digital optical or augmented reality or virtual reality (AR / VR) applications such as polarizers, optical compensators, reflective films, diffractive or surface gratings, Bragg polarization gratings (Bragg PG), polarized volume gratings (PVG), polarized volume holograms (PVH), Pangulamm-Bell (PB) gratings, optical waveguides, lenses or PB lenses.

The present invention relates to an optical element comprising a chiral liquid crystal (LC) polymer film as a sub-class of liquid crystal materials, a method for the production thereof and the use of the optical element as a diffractive optical element in optical or electro-optical components or devices, in particular for digital optical or augmented reality or virtual reality (AR / VR) applications, such as a polarizer, an optical compensator, a reflective film, a diffraction grating or surface grating, a Bragg polarization grating (Bragg PG), a polarization volume grating (PVG), a polarization volume hologram (PVH), a Pangulam-Bell (PB) grating, a non-mechanical beam steering element, an optical waveguide, an optical coupler, an optical combiner, a polarization beam splitter, a partial mirror or a lens.

The present invention relates to the technical field of semiconductors and discloses a side-emitting single-mode laser with a waveguide having an oxidized aperture hole and its manufacturing process, which prepares an oxidized aperture hole as an optically limited waveguide structure of a single-mode laser, wherein the partially insulated oxidized aperture hole limits the current injection window, which leads to a high current injection efficiency and a low leakage current of the device, while at the same time the side walls of the waveguide have lower scattering losses, which leads to a more pronounced suppression of higher modes and promotes the realization of a high-power single-mode laser with extremely low threshold current density.In the present invention, a structure with a surface grating is also introduced, thereby enabling the design of a single-mode laser with a high grating coupling coefficient, wherein the preparation process is simple, reliable and highly reproducible, which avoids complex secondary epitaxy processes, thereby reducing the risk of chamber contamination and promoting the reproducible preparation of high-quality gratings, thus enabling the realization of multi-wavelength arrays.

The invention discloses a femtosecond laser direct writing fiber grating device and method based on spatial light modulator beam shaping. According to the device, programmable modulation is carried out on a femtosecond laser wavefront phase through the spatial light modulator, a periodic dot matrix or stripe array can be generated, and flexible and efficient fiber bragg grating direct writing is realized by combining a spherical aberration beam shaping technology without depending on a traditional phase mask. A high-performance fiber bragg grating (FBG), a weak reflection fiber bragg grating (WFBG) and a point / line / face type grating can be prepared, periodic refractive index modulation is induced in an optical fiber core in a single exposure or scanning exposure mode, the method has the advantages of being flexible in processing, high in efficiency, customizable and the like, and the method is suitable for large-scale popularization and application. The defects of flexibility, preparation efficiency and complex grating processing in the prior art can be effectively overcome, and the method has important application value in the fields of optical fiber communication, optical fiber sensing, optical fiber lasers and the like.

A wavelength selective switching (WSS) module and a transmission device are provided, relating to the field of optical transmission. This WSS module enables an all-solid-state optical path without increasing the number or complexity of optical components, thereby reducing the cost of the WSS module. The WSS module includes: a polarization beam splitter unit, a lens, a grating assembly, and an optical switching engine; wherein the polarization beam splitter unit is attached to a first surface of the lens; the optical switching engine is attached to a second surface of the lens; and the grating assembly is attached to a third surface of the lens. The grating assembly has a first region and a second region, wherein the first region and the second region of the grating assembly have different rotation angles with respect to the polarization state of light. Embodiments of this application are applied to the field of optical transmission.

Providing virtual and augmented reality systems and methods having improved diffraction grating structures. [Solution] An improved diffraction structure for a 3D display system is disclosed. The improved diffraction structure includes an intermediate layer between a waveguide substrate and an upper grating surface. The upper grating surface comprises a first material corresponding to a first refractive index value, the lower layer comprises a second material corresponding to a second refractive index value, and the substrate comprises a third material corresponding to a third refractive index value. In one embodiment, the waveguide substrate, the lower layer, and the surface grating all correspond to different refractive index values. In one embodiment, the surface grating corresponds to a surface grating refractive index higher than the lower layer diffraction coefficient, and the lower layer diffraction coefficient is higher than the waveguide refractive index.

To provide a vibration control reinforcing surface lattice for improving an aseismatic reinforcing effect.SOLUTION: The vibration control reinforcing surface lattice has an inner frame 4 formed of two vertical frames and two horizontal frames. The inner frame 4 is provided in a rectangular space surrounded by structural members of a building. The plurality of vertical grids 5 are provided between the two horizontal frames of the inner frame 4. The plurality of horizontal grids 6 are provided between the two vertical frames of the inner frame 4 in a direction orthogonal to the vertical grids 5. A plurality of lattice parts are formed in the surface lattice damping wall. The vibration-damping member 7 is provided crosswise on at least one diagonal line of the plurality of lattice parts.SELECTED DRAWING: Figure 1