27results about How to "Low refractive index" patented technology

The laser chip and its fabrication method disclosed herein include a first reflective layer, an active region, an oxide layer, and a second reflective layer sequentially disposed on a substrate. The laser chip has a first trench and a second trench for oxidizing and etching the oxide layer. A first connecting portion connects one end of the first trench to one end of the second trench, and a second connecting portion connects the other end of the first trench to the other end of the second trench. Due to the influence of crystal anisotropy on the oxidation rate, and the mutual coordination of the first and second connecting portions on the oxidation rate, the oxide aperture includes a first oxide arc, a second oxide arc, a third oxide arc, and a fourth oxide arc. The first and second oxide arcs are arranged opposite each other, as are the third and fourth oxide arcs. The third and fourth oxide arcs have different radii of curvature, forming a specific irregular morphology. The oxide aperture based on the irregular morphology can effectively suppress transverse multimode lasing of the optical signal and reduce mode degeneracy.

The invention provides a red-light nitride epitaxial wafer, a preparation method thereof and a Micro-LED. The red-light nitride epitaxial wafer comprises a sapphire substrate, an insertion structure, an n-type nitride pattern structure layer, a light-emitting layer and a p-type metal nitride layer, the insertion structure penetrates through the n-type nitride pattern structure layer, the light-emitting layer and part of the p-type metal nitride layer and comprises a composite Si nano-column and a composite regulation and control layer, and the composite Si nano-column comprises a Si nano-column and a semi-ellipsoid structure; the composite regulation and control layer comprises a protection layer and a buffer layer, the protection layer is arranged on the outer wall of the Si nano-column, and the buffer layer is arranged on the area between the adjacent composite Si nano-columns; and an n-type nitride pattern structure layer, a light-emitting layer and a p-type metal nitride layer are laminated on the buffer layer between the adjacent composite Si nano columns. The In component merging and uniformity can be improved, the light-emitting efficiency and brightness of the Micro-LED are improved, the half-peak width of the light-emitting wavelength is reduced, and the color purity of display application is improved.

This disclosure provides a semiconductor laser, comprising: a substrate; an epitaxial assembly disposed on the substrate and configured to generate laser light, wherein a channel is formed by etching downwards at both ends of the epitaxial assembly in a lateral direction; and a ridge waveguide assembly, comprising: two first electrode waveguides respectively disposed within the channel and forming an ohmic contact with an ohmic contact layer of the epitaxial assembly, wherein the refractive index of the first electrode waveguides is lower than the refractive index of the ohmic contact layer to limit the spread of the lateral light field and improve the confinement factor of the fundamental mode; a lower electrode disposed on the substrate on a side opposite to the epitaxial assembly; and an upper electrode disposed on the ridge waveguide assembly and forming an ohmic contact with the ohmic contact layer and the ridge waveguide assembly, adapted to cooperate with the lower electrode to form an electron injection channel.

This invention belongs to the field of coating technology, specifically relating to a super-reflective photovoltaic enhancement coating, its preparation method, and its application. The coating raw materials include water-based acrylic resin, filler, titanium dioxide, dispersant, defoamer, and leveling agent; wherein the filler includes barium sulfate and / or core-shell particles, and the barium sulfate includes at least one of nano-sized barium sulfate, submicron-sized barium sulfate, micron-sized barium sulfate, and modified barium sulfate. The preparation method involves: adding the filler to deionized water, adding the dispersant, and dispersing; adding the water-based acrylic resin and stirring; adding titanium dioxide, defoamer, and leveling agent to adjust the fineness; adjusting the viscosity; and filtering to obtain the super-reflective photovoltaic enhancement coating. The coating is applied to photovoltaic modules. This invention's coating has the advantages of high reflectivity, full-band coverage, low cost, and stable performance.

This application provides a TOPCon solar cell with improved leakage current and its fabrication method, relating to the photovoltaic field. After phosphorus diffusion, a patterning process is performed on the front edge and central axis of the silicon wafer using a laser, followed by acid washing and alkali washing to obtain an alkali-washed silicon wafer. An Al2O3 thin film is prepared on the front surface of the alkali-washed silicon wafer using plasma ALD, followed by annealing to form an Al2O3 layer. SiO2 is then prepared on the surface of the Al2O3 layer using plasma ALD. x N y Layer; SiH4, CM4 and CH3M gases are introduced, and ALD is used on SiO2. x N y SiN layer surface x M layer; M is a halogen element, SiN x Halogen elements in the M layer move along the path close to SiO₂ x N y One side of the layer to the side away from SiO x N y The content gradient on one side of the layer decreases; electrode printing, sintering, and light injection are performed to obtain TOPCon solar cells with improved leakage current. This can reduce recombination loss and leakage current.

The application discloses a preparation method of a low-refractive composite powder and application thereof. The preparation method of the low-refractive composite powder comprises the following steps: mixing submicron powder with a mixture containing tetraethyl orthosilicate, heating, and reacting under an acidic condition to obtain a first sol slurry; mixing and stirring the first slurry with a binder to obtain a second slurry; and performing spray granulation and calcination on the second slurry to obtain a low-refractive core-shell structure composite powder. According to the technical scheme, the high-refractive or high-absorbance submicron powder, which is not suitable for or cannot be used for 3D printing, is covered with the silicon dioxide nanoparticles formed by the reaction of the mixture containing tetraethyl orthosilicate on the surface of the submicron powder, so that the refractive index or the absorbance of the submicron powder is reduced, the refractive index difference between the ceramic powder material which is difficult to solidify or cannot be solidified and the photosensitive resin is reduced, and the solidification performance of the ceramic material is improved.

This invention provides an antireflective coating, comprising: a substrate; and alternatingly stacked high-refractive-index layers and low-refractive-index layers along the thickness direction of the substrate, wherein the high-refractive-index layers are made of titanium pentoxide and the low-refractive-index layers are made of silicon aluminum oxide; the alternatingly stacked high-refractive-index and low-refractive-index layers along the thickness direction of the substrate sequentially include a first low-refractive-index layer, a first high-refractive-index layer, a second low-refractive-index layer, a second high-refractive-index layer, a third low-refractive-index layer, a third high-refractive-index layer, and a fourth low-refractive-index layer; the physical thickness of the second high-refractive-index layer is 143nm-130nm, and the physical thickness of the fourth low-refractive-index layer is 123nm-130nm. This invention improves the adhesion between the deposited antireflective coating and the substrate, and reduces the reflectivity of the antireflective coating in the near-infrared range.

The utility model belongs to the technical field of optical fiber light guide bars, and particularly relates to an optical fiber assembly for dental diagnosis and treatment, which comprises a light guide component and a connector fixed on the light guide component and used for connecting the light guide component with a dental curing machine, a convex block for extruding and expanding the rubber ring outwards is arranged in the plug head in a sliding manner, and the expansion action is realized by the thrust of the tail end in the inserting process of the plug head and the curing machine; it can be understood that the inner cladding of the optical fiber uses polytetrafluoroethylene to realize low-refractive-index total reflection, reduce light leakage and have high chemical stability; the middle layer reduces interface scattering and refractive index through silicon resin so as to inhibit light loss; an outer cladding layer is aluminized to reflect lateral light leakage and resist high temperature; and meanwhile, a linkage mechanism of the convex block and the rubber ring is arranged, and the plugging action of the connector and the expansion of the rubber ring are synchronously controlled through a linkage ring, so that the plugging convenience and the connection stability are realized.

This application relates to the field of optical thin film technology, and more particularly to a diffusion film, its preparation method, and its application. A diffusion film is provided, comprising a substrate and a diffusion film disposed on any surface of the substrate. The diffusion film is prepared from components with the following mass percentages: 0.5%–10% diffusion particles and 90–99.5% solvent. The resulting diffusion film exhibits high haze, high clarity, and high light transmittance. The provided formula is simple, reduces the use of other components, is low in cost, facilitates the dispersion of diffusion particles, achieves ideal light diffusion effects, and is suitable for widespread use.

A pigment dispersion composition for a black matrix, which contains carbon black, silica particles, a basic group-containing pigment dispersant, an acidic group-containing pigment dispersion aid, an alkali-soluble resin and a solvent, and wherein the silica particles are phenyl group-containing silica particles and / or (meth) acryloyl group-containing silica particles, the silica particles are 2-20 parts by mass (inclusive) per 100 parts by mass of the carbon black. The pigment dispersion composition for a black matrix is capable of forming a black matrix having high light-blocking properties but low reflectance from a glass surface.

This invention discloses a micro / nano optical fiber and surface coating preparation device and method based on evanescent field photocuring for surface encapsulation. The device includes standard optical fibers at both ends, a middle waist fiber, and two transition fiber sections connecting the standard and waist fibers. An ultraviolet (UV) adhesive coating is attached to the waist fiber. Low-refractive-index UV adhesive is cured in situ using an evanescent field transmitted on the outer surface of the micro / nano optical fiber, forming a surface coating that conforms to the fiber's own structure. The coating thickness is as low as the micrometer level. This effectively isolates the evanescent field and avoids surface contamination of the optical fiber, while reducing the size of the micro / nano optical fiber sensor, achieving a spatial resolution at the micrometer level, which is beneficial for miniaturization and integration. The use of low-refractive-index UV adhesive as the coating material ensures that the coating refractive index is lower than that of the optical fiber, allowing the optical signal transmission to meet the total internal reflection waveguide condition, ensuring low-loss transmission. Furthermore, the UV adhesive cures instantaneously within 0.1–1 s under UV light irradiation, supporting the formation of the surface coating during rapid movement.

The application provides a long-focus short-range imaging optical system for space and an imaging device, wherein the optical system is coaxially provided with a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth cemented lens group, a sixth lens and a seventh lens in sequence along a light incidence direction; the material of the first lens is quartz; the refractive index of the second lens and a fifth cemented negative lens of the fifth cemented lens group is greater than or equal to 1.9; the refractive index of the third lens, the fourth lens and the sixth lens is less than or equal to 1.5; the refractive index of a fifth cemented positive lens of the fifth cemented lens group is between 1.5 and 1.6; and the refractive index of the seventh lens is between 1.8 and 1.9. The application improves the radiation resistance of the optical system, makes the optical system suitable for space environment, realizes that the full field of view distortion is less than or equal to 0.1% at different object distances when the focal length is 75 mm, improves the image quality, and further solves the problem of image quality decline caused by object distance change during long-focus short-range imaging in the space radiation environment.

The application provides a multi-chamber wafer transfer control method and system based on an FCVD device, and an electronic device. The control method comprises: obtaining a film state characteristic value of a target wafer; the film state characteristic value characterizes a state of the target wafer after a precursor film layer thereof is self-deposited and continuously evolves over time; the target wafer is a wafer in a waiting transfer state after a front-end deposition is completed; based on the film state characteristic value, a film state change trend of the target wafer when entering multiple candidate chambers at a candidate transfer time is predicted; based on the film state change trend of the target wafer and an available state of each candidate chamber, a transfer priority of the target wafer is determined; a target chamber and a transfer time are determined in the multiple candidate chambers according to the transfer priority; and an actuator of the FCVD device is controlled to transfer the target wafer to the target chamber at the transfer time.

A curable resin composition, a thin layer manufactured from the resin composition, a color conversion panel including the thin layer, and a display device including the color conversion panel are provided. The curable resin composition includes a hydrolysis condensation reaction product of a reactant including a silane compound represented by Chemical Formula 1 and hollow particles, and a solvent. 1 ) a (R 2 ) b (R 3 ) c -Si-(OR 4 ) 4‑a‑b‑c .

The invention provides self-repairing TPU (thermoplastic polyurethane) optical resin as well as a preparation method and application thereof. According to the self-repairing TPU optical resin disclosed by the invention, dithio diethylene glycol is deliberately selected as a cross-linking agent to introduce a dynamic disulfide bond, so that a material network is endowed with dynamic reversibility; meanwhile, a thiocarbamate bond and a dynamic metal coordination bond are introduced to a polyurethane main chain, the multi-dynamic bond action mechanism breaks through the bottleneck of low self-repairing efficiency of a single dynamic bond in the past, and on the basis of ensuring the mechanical strength performance under the normal temperature condition, the material can be effectively repaired when being subjected to microscopic damage, so that the self-repairing efficiency of the material is greatly improved. And the exchange reaction of covalent hydrogen bonds and disulfide bonds can be triggered through external stimulation, so that the self-repairing of the damaged part is realized, the anti-scraping performance of the optical element is remarkably improved, and the service life is prolonged. The TPU optical resin provided by the invention has high-efficiency self-repairing performance, is recycled and regenerated, and realizes performance balance among high refractive index, low dispersion and mechanical strength.

The present disclosure provides a reflective display panel, a manufacturing method and a display device. The reflective display panel comprises a first substrate and a second substrate arranged oppositely, and a structure layer of electrorheological fluid, a first electrode layer and a second electrode layer between the first substrate and the second substrate. The structure layer of electrorheological fluid comprises insulating oil and metal particles in the insulating oil. The first electrode layer and the second electrode layer are configured to form an electric field in the structure layer of electrorheological fluid, and the direction of the electric field is parallel to the first substrate. A lens layer is arranged on one side of the first substrate close to the second substrate. When the first electrode layer and the second electrode layer are powered, the refractive index of the structure layer of electrorheological fluid is less than the refractive index of the lens layer, and the light incident from the side of the first substrate away from the second substrate to the lens layer is reflected back by the lens layer.

This invention relates to the field of functional film preparation technology, specifically to a method for preparing a wear-resistant, stain-resistant, transparent, and slip-resistant film, comprising a wear-resistant and hardening primer, a slip-resistant and transparent intermediate layer, and a wear-resistant and stain-resistant topcoat. The wear-resistant and hardening primer comprises hydroxyethyl acrylate modified amino resin, polyurethane oligomer, trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, a mixed solvent, KH560 silane coupling agent, nano-alumina, polytetrafluoroethylene micropowder, photoinitiator 1173, silicone leveling agent, and isocyanate curing agent. The mixed solvent is composed of ethyl acetate and ethanol. This invention employs a three-layer synergistic coating system, significantly improving the bonding stability between the coating and the substrate, as well as between the coating layers, through functional differentiation design and interface optimization of the primer, intermediate layer, and topcoat.

A thermoplastic forming supporting frame tempered glass plate of the thermoplastic forming supporting frame tempered glass interlayer liquid-filling anti-reflection heat-preservation reinforced composite plate is provided with an equal-height circumferential closed-loop supporting end socket frame integrated with the thermoplastic forming supporting frame tempered glass plate. And a liquid injection nozzle, transparent low-heat-conduction anti-freezing liquid and a binding agent. Two pieces of tempered glass with the corresponding length and width are connected through a binding agent to form a hollow interlayer, the hollow interlayer is filled with transparent low-heat-conduction anti-freezing liquid through a liquid injection nozzle, the liquid injection nozzle is sealed after vacuumizing is conducted, or the high-temperature transparent low-heat-conduction anti-freezing liquid is filled with transparent low-heat-conduction anti-freezing liquid through the liquid injection nozzle. And after a hollow interlayer formed by the tempered glass and the equal-height circumferential closed-loop supporting end socket frame is filled with the liquid, the liquid injection nozzle is closed, and the thermoplastic forming supporting frame tempered glass interlayer liquid-filling anti-reflection heat-preservation reinforced composite board is manufactured. The strength is greatly improved, the hail resistance, the wind resistance and the snow resistance are greatly improved, the problems of light transmission and heat preservation of cover glass and the problem of insufficient reliability are solved to a certain degree, and the development direction of a glass planting greenhouse is represented.

A film (1) includes hollow particles (10) and a binder (20). The hollow particles are made of a material having a refractive index of 1.15 to 2.70. The binder (20) is formed of at least a polysilsesquioxane and binds the hollow particles (10). The film (1) satisfies at least one of requirements Ib / Ia ≥ 0.7 and Ib / Ic ≥ 0.3. Ia is an absorbance derived from a hydrocarbon group not directly bonded to a silicon atom, the absorbance being determined by attenuated total reflection using a Fourier transform infrared spectrophotometer. Ib is an absorbance derived from a bond between a silicon atom and a non-reactive functional group. Ic is an absorbance derived from a bond between a silicon atom and a hydroxy group.

The invention relates to an antireflection film. An antireflection film (1) is provided with a transparent substrate film (2), an intermediate layer (3), and an antireflection layer (4) in this order toward one side in the thickness direction. The refractive index when light having a wavelength of 550 nm is incident on the intermediate layer (3) is 1.7-1.9. The anti-reflection layer (4) includes two or more laminates (10) each having a high refractive index layer (41) and a low refractive index layer (42). The refractive index when light having a wavelength of 550 nm is incident on the high refractive index layer (41) is greater than 2.50 and 2.80 or less.

The invention discloses a glass antireflection film and a preparation method thereof, and belongs to the field of glass antireflection films. Comprising a high-transmittance ultra-white glass substrate and an antireflection film layer arranged on the surface of the substrate, the antireflection film layer is divided into two structures: a single film layer structure which only comprises a porous AlPO4 film, the refractive index of the film is 1.36-1.39, the porosity is 20%-35%, and the thickness is 80-150 nm; the double-film-layer structure comprises a high-refractive-index dielectric layer and a porous AlPO4 film from bottom to top in sequence; the high-refractive-index dielectric layer is selected from one or more of compact SiO2, a SiO2 / TiO2 composite layer and compact AlPO4, and the thickness of the high-refractive-index dielectric layer is 100-250 nm; and the refractive index, porosity and thickness of the porous AlPO4 film are consistent with those of the porous AlPO4 film in the single film layer.

This invention relates to the field of optical functional thin film technology, and discloses a coating solution and an antireflective film. The coating solution comprises, by volume, the following components: 1-3 parts of a hollow silica nanoparticle dispersion with a solid content of 15-25%; 3-5 parts of silica sol; 1-3 parts of a film-forming aid; and 8-12 parts of an aqueous solution of an organic temporary binder with a solid content of 0.05-0.2%. In this invention, by combining the hollow particle framework responsible for optical performance with the silica sol binder responsible for mechanical strength, and supplementing it with process control components such as the organic temporary binder and film-forming aid, an antireflective film that maintains a low refractive index while possessing good mechanical strength, adhesion, and durability can be prepared. The effective refractive index of the antireflective film can be controlled between 1.20 and 1.35 by adjusting the formulation ratio, achieving a good match with the refractive indices of air and the optical substrate. The antireflective film of this invention maintains a low refractive index and broadband antireflective performance while also possessing good mechanical strength, adhesion, and environmental stability.

The invention discloses a micro-nano optical fiber for realizing surface packaging based on evanescent field photocuring and a surface coating preparation device and method, the micro-nano optical fiber comprises standard optical fibers at two ends, a middle waist region optical fiber and two transition region optical fibers for connecting the standard optical fibers and the waist region optical fiber, and an ultraviolet glue coating is attached to the waist region optical fiber. The evanescent field transmitted on the outer surface of the micro-nano optical fiber is used for in-situ curing of low-refractive-index ultraviolet glue, a surface coating attached to the structure of the micro-nano optical fiber is formed, the thickness of the coating is as low as micron order, the evanescent field is effectively isolated, pollution to the surface of the optical fiber is avoided, meanwhile, the size of the micro-nano optical fiber sensor is reduced, the spatial resolution reaches micron order, and the micro-nano optical fiber sensor has good application prospects. Micromation and integration are facilitated; low-refractive-index ultraviolet glue is selected as a coating raw material, it is guaranteed that the refractive index of the coating is lower than that of the optical fiber, optical signal transmission meets the total reflection guided wave condition, low-loss transmission is guaranteed, the ultraviolet glue is instantly cured within 0.1-1 s under ultraviolet irradiation, and formation of a surface coating in rapid movement is supported.

The invention discloses a polyester optical film coating liquid, a polyester optical film and a preparation method and application, and relates to the technical field of optical functional thin films, and the polyester optical film coating liquid comprises a hollow polymer microsphere nanofiller, water dispersible resin and water-soluble resin; according to the polyester optical film coating liquid disclosed by the invention, the hollow polymer microspheres are introduced as functional nano filler, so that the refractive index of a pre-coating layer is reduced on the premise of not influencing the adhesiveness of the pre-coating layer formed by the polyester optical film coating liquid and a polyester base film, and meanwhile, relatively low haze and relatively high light transmittance of the polyester optical film are kept.

The present disclosure provides a void layer having a low refractive index and excellent mechanical strength. A void layer (11) according to the present disclosure is a void layer in which pulverized materials of a gel-like silicon compound are chemically bonded, the gel-like silicon compound is a compound in which silane compounds are condensed or partially condensed, the silane compounds include a 1-trifunctional silane compound and a tetrafunctional silane compound, and the refractive index of the void layer (11) is 1.30 or less.

The present disclosure provides a low reflectivity glass and a preparation method and application thereof, and the specific steps are as follows: a glass substrate is strengthened, lithium ions in the glass substrate are exchanged with sodium ions in the outside world, the exchange depth is d1, the sodium ions are exchanged with potassium ions in the outside world, the exchange depth is d2, and a low reflectivity glass is obtained; wherein, d1>d2, and the maximum optical path difference of the glass substrate is less than 2. Through the method of double ion exchange, a high-potassium strengthened layer and a high-sodium strengthened layer with gradient refractive index are formed on the surface of the glass, the reflection of light is reduced, the reflectivity of the glass is further reduced, and the scratch resistance of the glass is improved. The low reflectivity glass prepared by the present disclosure can reach a reflectivity of less than 8.1% at 550 nm when the thickness is 1.3 mm, and also has good scratch resistance, and the scratch width is less than 100 mu m when the load is 1 kg.