24 results about "Photonic crystal structure" patented technology

A surface-emitting laser device and a method for manufacturing and operating the same are disclosed. The surface-emitting laser device comprises an active layer, a semiconductor layer optically coupled to the active layer, and a photonic crystal structure disposed within the semiconductor layer. The device further comprises a laser region and a detector region. The laser region includes a first set of electrical contacts located on opposite sides of the active layer and the semiconductor layer, and generates the output field of the device. The detector region includes a second set of electrical contacts located on opposite sides of the active layer and the semiconductor layer, and located outside the first laser region. The detector region is configured to generate an output current proportional to the output field. The presence of the detector region within the device improves the structure and power monitoring techniques compared to the prior art.

The embodiment of the application is suitable for the technical field of photonic crystal design, and provides a photonic crystal design method, device, computer equipment and storage medium, the photonic crystal design method comprises: determining the structure of a photonic crystal to be generated; generating a data set according to the structure; training a deep neural network model using the data set; constructing a reinforcement learning model, the reinforcement learning model comprising an agent; using the agent and the deep neural network model, output a plurality of predicted structures, any of the predicted structures comprising a corresponding band gap structure. The photonic crystal design method can improve the efficiency of generating photonic crystals that meet the design requirements, and can search for the photonic crystal structure to be taken in the storage space that stores a large number of search effective photonic crystal structures, ensuring the efficiency and accuracy of photonic crystal design.

This invention proposes a method for fabricating three-dimensional photonic crystals based on the standing wave effect, comprising: ultrasonically cleaning a silicon substrate; spin-coating photoresist onto the cleaned silicon substrate surface, followed by a pre-baking process to form a resist layer on the silicon substrate surface; performing a first exposure on the resist layer using a dual-beam laser interferometry system to form horizontal interference fringes within the resist layer, while the incident light interferes with the reflected light from the silicon substrate to generate a vertical standing wave effect; keeping the silicon substrate unchanged, rotating the sample around a vertical axis, and performing a second exposure using the same parameters to form a second set of interference fringes in the horizontal direction, which superimposes with the first exposure to form a two-dimensional periodic light intensity distribution, while the vertical standing wave effect superimposes to enhance the intensity modulation depth.

This invention discloses a method for fabricating a photonic crystal hydrogel film sensor with a self-reporting elastic modulus function and its application. The method involves fabricating a hydrogel film with a periodic photonic crystal structure and constructing a bio-interface on its surface that can dynamically regulate cell adhesion, detachment, spreading, migration, proliferation, and differentiation. An optical imaging system is used to acquire images of the structural color changes of the photonic crystal hydrogel film. Image processing extracts color parameters, which are then converted into changes in reflected wavelength and the film deformation field. The elastic modulus of the film is calculated by inverting the deformation field generated by microspheres of known mass placed on the film surface, combined with an elasticity model. By combining the cell-interface interaction deformation field, the cell-interface interaction force and its spatial distribution can be obtained. A photonic crystal hydrogel film sensor with a self-reporting hardness function is constructed. This method achieves integrated biomechanical research combining dynamic regulation and real-time monitoring, offering advantages such as non-destructive operation, real-time imaging, and acquisition of mechanical spatial distribution.

The application discloses a 750-850nm waveband photonic crystal surface emitting laser and a preparation method, and belongs to the field of semiconductor lasers. The application is divided into surface etching and buried photonic crystal layer structures, uses n-GaAs as a substrate, combines surface etching or buried photonic crystal structures, uses amorphous silicon, titanium oxide, GaP or AlGaAs as main materials of a resonant cavity, utilizes large-area in-plane resonance and high coupling with a quantum well active layer, realizes low-loss resonance and optical gain, and realizes a 750-850nm waveband semiconductor laser with high light beam quality, high power and surface emission.

This invention relates to a photodetector comprising a support layer (10), a grating structure (20), and an active layer (30). The grating structure (20), referred to as a photonic crystal structure, comprises a pattern (22.1) and a non-zero constant thickness e. ccs The structured layer (22) is formed by the continuous sublayer (22.2), and the pattern (22.1) widens along the direction toward the continuous sublayer (22.2). Furthermore, the size of the photonic crystal structure (20) is such that the structured layer (22) forms a photonic crystal that supports at least one guided mode that can be excited by the incident light of interest. The photonic crystal is optically coupled to the active layer (30), such that the guided mode is optically confined in the structured layer (22) and the active layer (30).

This invention discloses a photonic crystal structure with multiple types of topological edge states and its implementation method, belonging to the field of photonic crystal and topological photonics technology. The photonic crystal consists of a triangular lattice structure composed of multiple sets of lattice units with a lattice constant of . Each set of lattice units includes multiple sub-lattice units composed of yttrium iron garnet magneto-optical pillars and NdFeB permanent magnets at their upper and lower ends. The sub-lattice units are uniformly distributed in a polygonal pattern, with their circumferential spacing divided into two groups: one group shrinks inward along the center of the sub-lattice, and the other group expands outward along the center of the sub-lattice, forming two nested triangular lattice structures. This structure, through the coordinated design of magnetization direction and lattice structure symmetry, simultaneously breaks the time-space inversion symmetry, achieving for the first time the coexistence of chiral and antichiral topological edge states, and chiral and Gull-Hall topological edge states, on the same photonic crystal structure configuration.

The application belongs to the technical field of photonic crystal structure coloration, and discloses a preparation method of liquid photonic crystals based on monodisperse and high-stability colloidal particles, which comprises the following steps: S1, polymer monomer A and charged comonomer B are added into deionized water to perform copolymerization reaction by means of emulsion polymerization, and a crosslinking agent is added as needed, and polymer colloidal particles with high surface charge density characteristics are obtained through the reaction; S2, the polymer colloidal particles are dispersed into a dispersant, so that the polymer colloidal particles in the system are gradually reduced to a preset concentration state, and liquid photonic crystals with structural color and dynamic recovery are obtained. Through the application, the high stability requirement of the liquid photonic crystals can be met, and the structural color with high brightness and high saturation can still be presented even at a low concentration; the preparation method of the application is simple and easy to operate, the purification process is short in time consumption, the system has high stability, and is suitable for the application occasions of macro-preparation of liquid photonic crystals.

The present application relates to the field of pigments, and discloses a preparation method of a fluorescent structural color pigment and application thereof.The preparation method comprises the following steps: 1) using N-(beta-aminoethyl-gamma-aminopropyl)methyldimethoxysilane as a passivation agent and citric acid as a carbon source, a silane functionalized carbon quantum dot mother liquor is prepared by a hydrothermal method; and 2) mixing carbon black containing hydroxyl groups on the surface and the silane functionalized carbon quantum dot mother liquor with a silicon source, and performing a hydrolysis reaction under alkaline conditions to obtain carbon quantum dot hybrid silica coated carbon black nanospheres.A new type of fluorescent structural color pigment is prepared by combining carbon quantum dots with photonic crystal structural color materials.Compared with a simple physical doping method, the carbon quantum dots are doped in the shell layer of the photonic crystal structural color material through a clever chemical modification method in the present application, so that the dispersion of the carbon quantum dots can be better realized, and the fluorescence quenching phenomenon caused by local high concentration aggregation or contact with metal ions can be avoided.

A photonic crystal surface-emitting laser structure includes a substrate, an N-type cladding layer, an active layer, a refractive index matching layer, and a photonic crystal structure. The N-type cladding layer is disposed on the substrate. The active layer is disposed on the N-type cladding layer. The refractive index matching layer is disposed on the N-type cladding layer and surrounds the active layer. The refractive index matching layer is electrically insulating, and an equivalent refractive index of the refractive index matching layer is substantially the same as an equivalent refractive index of the active layer. The photonic crystal structure is disposed on the active layer and the refractive index matching layer. By virtue of the above structure, a divergence angle and a threshold current of the laser can be reduced.

The application belongs to the technical field of structural color, and discloses a method for repeatedly constructing structural color on thermoplastic plastic and application. Nano-silica microspheres are deposited on a thermoplastic plastic substrate, and an ordered and periodic photonic crystal structure is formed through self-assembly, presenting structural color. The thermoplastic plastic substrate with the deposited photonic crystal is placed into a flat vulcanizing machine for heating and pressing, so that the photonic crystal structure and the structural color presented thereby are firmly attached to the thermoplastic plastic substrate. The thermoplastic plastic substrate with the firmly attached structural color is again placed into the flat vulcanizing machine for heating and pressing, so that the attached structural color is faded, and thus the thermoplastic plastic substrate with faded color can be colored again. The structural color obtained by the application has high color fastness, can be repeatedly colored, has the angle color change characteristic, is simple, fast, effective, green and environment-friendly, and can be applied to the fields of dyeing, decoration and anti-counterfeiting, and provides a feasible method for replacing the use of traditional dyes.

The application discloses an LED chip and a manufacturing method thereof. The LED chip comprises a substrate, an epitaxial layer arranged on the substrate, the epitaxial layer comprising an N-type semiconductor layer, a quantum well structure layer and a P-type semiconductor layer, a photonic crystal structure layer arranged on the P-type semiconductor layer, the photonic crystal structure layer being electrically connected with the P-type semiconductor layer, wherein the photonic crystal structure layer is distributed with photonic crystal structures, the photonic crystal structures are composed of a first film layer material with a first refractive index and a second film layer material with a second refractive index arranged periodically and alternately, and the first refractive index is different from the second refractive index, so that the brightness and light efficiency of the LED chip are improved.

The application discloses a kind of based on double topological corner state second harmonic generation device and method, with same energy band structure but opposite inner layer topological photonic crystal and outer layer topological photonic crystal of bulk polarization composition for second harmonic generation topological photonic crystal structure.It is equilateral triangle in the region boundary of inner layer topological photonic crystal and outer layer topological photonic crystal, under nearest neighbor interaction and long-range interaction, high Q value I type topological corner state and II type topological corner state appear near the three vertices of equilateral triangle region, and make the intrinsic frequency of II type topological corner state be twice the intrinsic frequency of I type corner state.When the light power density irradiated on inner layer topological photonic crystal reaches and exceeds second harmonic generation threshold, nonlinear interaction will occur between I type corner state and II type corner state, so that the second harmonic mode corresponding to II type corner state is excited out, realizes high-efficiency second harmonic generation, and is topologically protected, has certain anti-interference to defect.

The present application provides an information anti-forgery storage system based on microfluidic optical characteristics, and relates to the technical field of information security protection, wherein nanoparticles self-assembled to form photonic crystals are arranged in a microfluidic channel network to store original information; the fluorescence lifetime value of an environmentally responsive fluorescent dye is detected; a dynamic correlation model is constituted; high sensitivity and early warning of physical tampering behavior are realized; the fluorescence lifetime value which is extremely sensitive to microenvironment changes is used as an auxiliary modal optical characteristic signal value response detection; a multimodal correlation response is performed in combination with the reflection spectrum peak wavelength of the photonic crystal; any physical intrusion must first disturb the microenvironment, causing the fluorescence lifetime to first abnormally drift, and then the photonic crystal structure is damaged, causing the reflection wavelength to change; through real-time monitoring, the intrusion intention can be determined extremely early before the information is actually tampered with; passive protection is changed to active early warning; and the security and dynamic response capability of information storage are increased.

This invention belongs to the field of gas sensing materials technology, and discloses a SnO2 / NiO three-dimensional photonic crystal gas-sensitive material based on a polystyrene (PS) microsphere template, its preparation method, and its application. The method includes: pre-treating a glass slide by ultrasonic and solvent cleaning; adding a PS microsphere dispersion to its surface and drying it to form a template layer; preparing a precursor solution by dissolving SnCl2·2H2O and NiCl2·6H2O in ethanol at a predetermined molar ratio; adding the precursor solution to the surface of the PS microsphere template layer and drying it to form a precursor composite layer; calcining at 300–800 °C to remove the template and form a SnO2 / NiO three-dimensional photonic crystal structure; and using the obtained material as a sensitive layer to construct a gas-sensitive element for acetone gas detection. By controlling the molar ratio of Sn to Ni, the gas response / recovery time is effectively shortened, with a Sn:Ni ratio of 3:1 exhibiting superior response kinetics performance. Gas-sensitive testing results show that the SnO2 / NiO three-dimensional photonic crystal composite material with a Sn:Ni molar ratio of 3:1 exhibits a response value of 9.60 and a response time of 176 s to 100 ppm acetone, while the pure SnO2 sample shows a response value of 7.84 and a response time of 207 s. Both the response value and response speed are significantly improved. This material combines a three-dimensional ordered porous structure with the synergistic effect of a p-n heterojunction, which can significantly improve gas diffusion efficiency and interfacial charge transport capability, demonstrating excellent selectivity and concentration response characteristics, making it suitable for the rapid detection of acetone gas.

This invention relates to the field of resin preparation, specifically to a method for preparing a high-whiteness, heat-resistant, and yellowing-resistant ultraviolet-absorbing resin. It provides a composite whitening system composed of rare-earth-doped mesoporous inorganic whitening fillers and photonic crystal structure inorganic whitening fillers. The method prepares a light-absorbing filler with a hierarchical pore structure and a latent yellowing-resistant crosslinking system. The resin matrix containing epoxy reactive groups, the composite whitening system, the hierarchical pore light-absorbing filler, the latent yellowing-resistant crosslinking system, and stabilizing agents are melt-blended under stepped temperature control. A high-temperature crosslinking trigger segment is incorporated during the stepped temperature-controlled melt-blending process to rupture and release the microencapsulated imidazole curing agent. This process also promotes the crosslinking reaction between a hindered phenolic structure-containing siloxane prepolymer and the resin matrix, forming a crosslinked network. The resin has a crosslinking gel content of 70%–95%. The resin is obtained by extrusion granulation. This invention achieves high whiteness, high-temperature yellowing resistance, and a higher thermal decomposition temperature.

The application discloses a kind of multistage wrinkled polyaniline film with two-dimensional inverse opal photonic crystal structure and preparation method thereof.The preparation method comprises the following steps: (1) by gas-liquid self-assembly method, prepare two-dimensional photonic crystal microsphere's conductive glass;(2) using electrochemical in-situ polymerization method, with platinum sheet as counter electrode, Hg / Hg2SO4 as reference electrode, two-dimensional photonic crystal microsphere's conductive glass as working electrode, aniline-containing acidic solution as electrolyte, the working electrode is placed in three-electrode system, obtain two-dimensional photonic crystal microsphere / polystyrene film composite;(3) two-dimensional photonic crystal microsphere / polystyrene film composite is transferred to polydimethylsiloxane surface, and multistage wrinkled polyaniline film with two-dimensional inverse opal photonic crystal structure is prepared.The application is prepared by regular arrangement of surface array two-dimensional ordered polyaniline wrinkle, and multistage wrinkle is formed on the surface of two-dimensional ordered wrinkle.

The embodiment of the present application provides a one-dimensional photonic crystal cascade slot waveguide for silicon hetero integration, and belongs to the technical field of optoelectronic devices.The slot waveguide comprises: a monocrystalline silicon layer, which constitutes the body of the slot waveguide; a slot, which is arranged on the monocrystalline silicon layer; and a defect part, which is periodically arranged in the one-dimensional photonic crystal slot waveguide, and constitutes a resonant cavity of the one-dimensional photonic crystal cascade slot waveguide, thereby forming a cascade resonant unit of the one-dimensional photonic crystal cascade slot waveguide.The one-dimensional photonic crystal cascade slot waveguide has an optical bandwidth superior to that of a two-dimensional photonic crystal structure, and has lower transmission loss and better processing robustness.

This invention provides a large-size III-V semiconductor suspension film, its fabrication method, and a device for optoelectronic integrated structures. The large-size III-V semiconductor suspension film, its fabrication method, and the device of this invention avoid damage to the III-V semiconductor, maximally preserving the original structure and optical properties of the III-V semiconductor material. This makes the size of the III-V semiconductor suspension film controllable, facilitating the fabrication of photonic crystal structures. The entire process has low equipment requirements, low cost, and strong adaptability, facilitating mass production. The fabrication method of this invention is compatible with various subsequent micro-nano etching processes, exhibiting good platform compatibility.

The application relates to the technical field of infrared LED manufacturing, and discloses a preparation method of an interface-regulated infrared LED, which comprises the following steps: step one, preparing a graphene base layer: plating an infrared emission material on the graphene base to form an infrared emission unit; step two, arranging and plating: designing a photonic crystal structure, and arranging and plating the infrared emission unit according to the crystal structure; step three, embedding the infrared emission unit and a wire into a groove of an infrared LED base to form a semi-finished product LED; and sintering and recrystallizing the prepared semi-finished product LED to form a finished product LED. According to the application, the infrared emission unit of the infrared LED is arranged and plated according to certain rules, and the infrared emission unit is fixed by rolling and pouring processes, so that the light-emitting wavelength of the infrared LED can be regulated, the photoelectric conversion efficiency of the infrared LED is improved, the manufacturing process of the infrared LED is simplified, and the large-scale application of the infrared LED is promoted.

The present application relates to a kind of based on photonic crystal Mini-LED / Micro-LED full-color display device and preparation method thereof, Mini-LED / Micro-LED full-color display device includes: driving substrate, is provided with driving circuit;At least three colors of light emitting unit, bonding in driving substrate, each light emitting unit is blue light Mini-LED / Micro-LED chip processing preparation, each light emitting unit includes the buffer layer, n-GaN layer, blue light multiple quantum well layer and p-GaN layer sequentially stacked;Each described light emitting unit further includes control electrode, the control electrode includes p-type electrode layer and n-type electrode layer;Each light emitting unit can also be provided with the green photonic crystal structure or red light body structure extending to n-GaN layer through buffer layer, and green light emitting unit or red light emitting unit is formed, the light emitting unit without photonic crystal structure is blue light emitting unit;In array arrangement adjacent three light emitting units include red light emitting unit, green light emitting unit and blue light emitting unit.

This invention belongs to the field of infrared heating technology, and discloses an infrared photonic crystal heating film, its preparation method, and its application. The heating film includes an infrared radiation layer, which forms a photonic crystal structure composed of multiple core-shell PN junction microspheres arranged in an orderly manner. Under the influence of an applied current, the core-shell PN junction microspheres undergo directional motion and energy level transitions of charge carriers, achieving purely electro-induced infrared emission. This fundamentally changes the energy conversion path of traditional heating films, which involves heating first and then radiating, reducing energy dissipation caused by heat conduction and convection, and significantly improving infrared radiation intensity and heating efficiency. Simultaneously, the photonic crystal bandgap effect enhances the infrared radiation intensity and enables modulation of the infrared radiation band, resulting in a significantly improved efficiency compared to traditional electric heating.