198 results about "Photonic crystal structure" patented technology

The invention discloses a Janus cotton fabric with radiation refrigeration and antibacterial functions and a preparation method thereof.The preparation method creatively achieves multifunctional integration through multistage structural design and interface engineering and specifically comprises the steps that 1, a bionic silicon dioxide nano sheath layer grows on the surface of cotton fiber in situ through a controllable sol-gel method; the monodispersity of the nanoparticles is ensured by optimizing the ratio of the TEOS to the silane coupling agent; (2) introducing high-refractive-index nanoparticles to construct a dual-scale photonic crystal structure, and enhancing solar spectrum reflection by using a plasma resonance effect; (3) performing hydrophilic interface modification by adopting a biomacromolecule self-assembly technology to form a super-hydrophilic antibacterial layer; and (4) constructing a super-hydrophobic interface on the single side of the fabric through precise spraying, and finally forming a Janus structure with an asymmetric wetting gradient. The preparation process is mild in condition and high in controllability, and the obtained Janus fabric has excellent antibacterial performance (the antibacterial rate gt; 99.5%) and radiation refrigeration performance (daytime sub-environment temperature drop gt; 8 DEG C).

The invention provides a photonic crystal surface emitting laser and a manufacturing method thereof, the photonic crystal surface emitting laser comprises a gain assembly and a photonic crystal assembly, and the gain assembly comprises a semiconductor substrate, a carrier transport layer and an active layer which are stacked in sequence; the photonic crystal assembly comprises a silicon-on-insulator structure and a photonic crystal structure formed on the silicon-on-insulator structure; the active layer and the photonic crystal structure are combined in a bonding mode so that light feedback and surface emission can be achieved through the photonic crystal structure when the active layer emits light. According to the photonic crystal surface emitting laser and the manufacturing method thereof, the key components of the photonic crystal surface emitting laser are separately manufactured and integrated through bonding, so that the manufacturing process is simplified, the manufacturing cost is reduced, the yield is improved, the process of each module can be independently optimized, and the risk of failure of the whole process is reduced.

A two-dimensional photonic crystal surface emitting laser includes an n-doped substrate, an n-doped cladding layer, an active layer, a photonic crystal layer, a p-doped cladding layer and a p-doped contact layer arranged in sequence from top to bottom. The photonic crystal layer includes a base material and a plurality of unit cells arranged periodically, each unit cell includes a first different-refractive index region, a second different-refractive index region and a third different-refractive index region that have a different refractive index from the base material. The surface emitting laser based on the photonic crystal structure may maintain single-mode operating characteristics of a device under a large mode field area, so that a high-power single-mode surface emitting laser may be achieved.

The invention discloses a photonic crystal topological optimization method, a photonic crystal topological optimization device and electronic equipment. The method comprises the following steps: determining an objective function according to the inherent frequency of a phononic crystal structure on adjacent two-order dispersion curves; determining a preset constraint condition, wherein the preset constraint condition comprises one or more of a minimum size constraint, a static stiffness constraint and a volume constraint; determining the maximum value of the target function based on a preset constraint condition and a preset optimization function, and determining the density of each photonic crystal unit according to the maximum value; and determining unit cells of the photonic crystal according to the density of each photonic crystal unit. According to the photonic crystal topological optimization method, the manufacturability of the structure is ensured by applying the minimum size constraint, the static stiffness constraint and the volume constraint, meanwhile, the maximum band gap of the photonic crystal structure can be effectively captured by maximizing the target function by taking the band gaps of the two adjacent orders as the target function, the vibration reduction performance of the structure is improved, and the performance of the photonic crystal is improved. Therefore, the photonic crystal with collaborative design of manufacturability and vibration reduction characteristics is realized.

The invention relates to the technical field of functional polymer composite materials, in particular to an intermediate film for laminated glass based on color generation of a photonic crystal structure and a preparation method of the intermediate film. The intermediate film comprises a thermoplastic resin matrix and a three-dimensional photonic crystal structure region dispersed in the thermoplastic resin matrix, wherein the three-dimensional photonic crystal structure region is formed by self-assembly of monodisperse microspheres, and the central wavelength of a photonic forbidden band of the region is located in a visible light range. According to the invention, a three-dimensional photonic crystal structure is constructed in the intermediate film, and structural color generation is generated by utilizing selective reflection of the photonic band gap effect on visible light with a specific wavelength. According to the laminated glass, the color is generated by interference of light instead of absorption of chemical pigments, so that the color can be continuously and regularly changed along with the change of an observation angle or an incident light angle, the dynamic and changing visual aesthetic feeling is given to the laminated glass, and the higher requirements of the fields of modern buildings, automobiles and the like on dynamic aesthetics and personalized appearance are met.

The invention provides a multi-junction cascade photonic crystal surface emitting laser and a preparation method thereof. The multi-junction cascade photonic crystal surface emitting laser comprises a substrate; the three-dimensional photonic crystal structure is arranged on the substrate, the three-dimensional photonic crystal structure comprises a longitudinal periodic structure formed by a plurality of laminated structures which are sequentially stacked in the vertical direction of the substrate, each laminated structure comprises an active layer and a photonic crystal layer, and the photonic crystal layer provides optical feedback for the active layer to form optical resonance; a transverse periodic structure is formed in each photonic crystal layer; and the plurality of tunnel junctions are arranged between the two adjacent laminated structures and are used for electrically connecting the two adjacent laminated structures.

The invention belongs to the technical field of nano photonic crystal micromachining, and particularly relates to a suspended photonic crystal film and a preparation method thereof. Sequentially depositing an aluminum oxide layer, a silicon dioxide layer and a silicon nitride layer on the silicon substrate, and then forming a patterned photonic crystal structure by etching the silicon nitride layer; part of the silicon substrate is removed through dry etching, the exposed aluminum oxide layer and the exposed silicon dioxide layer are sequentially removed through a wet etching or dry etching synergistic process, and the suspended photonic crystal film is obtained. Through the design of the composite sacrificial layer and the inverted etching strategy, the problems of structure collapse, etching residue and low alignment precision in the traditional process are solved, and the method is suitable for the fields of Moire photonics, integrated photonics and the like.

The invention provides a multi-wavelength integrated light source system and a manufacturing method thereof, the multi-wavelength integrated light source system comprises a PCSEL array and a photon integrated circuit, the PCSEL array comprises a plurality of PCSEL units, and photonic crystal structures of at least two PCSEL units in the plurality of PCSEL units are configured to have mutually different preset geometric parameters so as to respectively emit light with different wavelengths; the photonic integrated circuit comprises at least one wavelength division multiplexer; the photonic integrated circuit is formed on the photonic integration platform, and the PCSEL array and the photonic integrated circuit are physically bonded in a hybrid integration mode, so that light of different wavelengths emitted from at least two PCSEL units is coupled to different input ends of the wavelength division multiplexer.

The present invention relates to a photonic crystal coating, a preparation method, and its application, belonging to the technical field of photonic crystal structure color generation. The photonic crystal coating comprises the following components, measured in parts by weight: 100 parts of a hard-core-soft-shell nanosphere dispersion, 1 to 8 parts of a leveling agent, 0.1 to 0.4 parts of a stray light absorber, and 0 to 6 parts of a high-boiling-point additive. The photonic crystal coating is directly prepared from hard-core-soft-shell colloidal nanospheres. The resulting structural color coating exhibits excellent structural stability (associated with high color fastness), high color saturation, and a significant iridescent effect.

The invention discloses a three-dimensional asymmetric photonic crystal laser and a preparation method thereof. An epitaxial structure of the three-dimensional asymmetric photonic crystal laser comprises an N-type electrode, an N-type InP substrate, an N-type Al < x > < 1 > In < 1-x > < 1 > As upper limiting layer, a quantum well active region, a P-type Al < y > < 1 > In < 1-y > < 1 > As electron barrier layer, a P-type Ga < z > < 1 > In < 1-z > < 1 > Asz < 2 > P < 1-z > 2 functional layer, a P-type Al < x > < 2 > In < 1-x > < 2 > As lower limiting layer, a P-type InP connecting layer, a bottom insulating layer and a P-type electrode, wherein a three-dimensional asymmetric photonic crystal is etched on the P-type GaInAsP functional layer, and a chiral characteristic is introduced by destroying the symmetry of the photonic crystal, so that the P-type GaInAsP functional layer vertically emits a single-mode light beam with left-handed or right-handed circular polarization. By designing an asymmetric photonic crystal structure, efficient output of circularly polarized light beams is achieved, polarization selectivity and light beam quality are remarkably improved, and the advantages of low divergence angle and high light beam stability are achieved.

Semiconductor lasers and methods of forming the same are disclosed. A semiconductor laser includes a substrate and an epitaxial structure. The epitaxial structure grows on a substrate along a first direction and comprises an active region stacking structure and a photonic crystal structure. Wherein the active region stacking structure comprises a plurality of active regions stacked in the first direction, and the photonic crystal structure is located on the side, away from the substrate, of the active region stacking structure in the first direction. Laser generated by the semiconductor laser is emitted from the substrate or from one side far away from the substrate along a first direction.

The invention discloses a stealth coating material for aviation aircrafts. According to the invention, a three-layer composite structure design is adopted; the intelligent sensing layer is composed of graphene quantum dots and a piezoelectric nanofiber composite network, so that real-time sensing of electromagnetic wave signals is realized; the tunable metamaterial layer comprises a liquid crystal elastomer matrix and nickel-titanium alloy nanowires dispersed in the liquid crystal elastomer matrix, and electromagnetic parameters of the material are dynamically adjusted by applying an electric field or a temperature field; vanadium dioxide nanoparticles, a photonic crystal structure and carbon nanotube aerogel are integrated in the multispectral stealth layer, and radar, infrared and visible light multispectral synergistic stealth is achieved. The coating is further integrated with a microencapsulation repairing agent and an intelligent control system, and has the self-repairing and self-adaptive adjusting functions. Compared with the prior art, 0.1-40 GHz ultra-wide frequency band radar wave absorption is achieved, the radar cross section is reduced by 25-30 dB, the infrared radiation characteristic is reduced by 80% or above, the surface density is only 1.2-1.5 kg / m, the weight is reduced by 65% compared with a traditional coating, and a key material technical support is provided for a new generation of stealth aircrafts.

The present invention discloses a preparation method based on an integrated cuprous oxide photocathode. The method includes the preparation of a protein template, the step of preparing a hole transport layer on a conductive substrate, the formation of an inverse protein cuprous oxide photonic crystal structure, and the preparation of a protective layer. Its feature lies in that the step of preparing the photocathode based on the multiple modification of cuprous oxide photonic crystals includes: self-assembling a nanoscale protein template on the substrate with a hole transport layer, then electroplating cuprous oxide and a protective layer by an electrochemical method, and finally forming a multifunctional photocathode with an inverse protein photonic crystal structure through a high-temperature pyrolysis method or a solvent adsorption and desorption method. The multi-layer modified inverse protein Cu2O photocathode obtained by the present invention presents an ordered porous structure and exhibits the characteristics of a photonic crystal. By controlling the size of the protein template, the internal morphology of the inverse protein photonic crystal is regulated, and with the assistance of superimposing multi-layer functional thin films, three goals are achieved: a, improving the light capture ability of the material; b, increasing the photogenerated charge separation efficiency and accelerating the transfer of photogenerated electrons-holes from the bulk to prevent their self-oxidation; c, and avoiding the self-reduction of cuprous oxide through the presence of the protective layer. In the photo-electrochemical catalytic carbon dioxide reaction, the integrated Cu2O photocathode efficiently converts carbon dioxide into carbon monoxide (Φ STC = 1.6%, Yeild CO = 46.7 mmol / h).

A micro LED panel having a micro LED array and the system and method to manufacture the micro LED panel are provided in the present disclosure. The micro LED array includes at least one micro LED structure. The micro LED structure at least includes: a mesa structure and a photonic crystal structure array, which is formed in the mesa structure, thereby realizing higher directional light emission, simpler structure and lower cost. Furthermore, the re-growth layer is formed on at least one part of the sidewall of mesa structure, which decreases the non-radiation recombination at the sidewall surface of the mesa structure, improving the light emission efficiency and the image quality.

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

The 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.

Provided is a display device having a plurality of light-emitting elements arrayed on a substrate. Each of the light-emitting elements comprises: a light-emitting layer; a first electrode and a second electrode sandwiching the light-emitting layer from above and below; a photonic crystal structure provided so as to face the light-emitting layer across the second electrode; and an insulating layer that is provided between the first electrode and the light-emitting layer and has an opening over the center of the photonic crystal structure. The photonic crystal structure comprises: a plurality of columnar bodies arrayed periodically in a predetermined periodic length in a first region overlapping the opening and a second region not overlapping the opening; and a plurality of defects that disrupt the periodicity of the array of the plurality of columnar bodies and that are provided within the first region so as to be spaced apart from one another by three periods or more.

The present invention belongs to the field of textile structural coloration, and particularly relates to a non-densely packed photonic crystal structure color-forming fabric and its preparation method. The method comprises the following steps: S1 constructing an assembly working fluid, S2 applying the assembly working fluid and completing assembly: uniformly applying the assembly working fluid to the fabric surface, and assembling at a temperature of 50-80°C for 2-10 minutes. When the apparent moisture completely evaporates, the assembly is completed; S3 a water removal step, and S4 a brightening step. The brightening treatment process conditions are a temperature of 110-140°C and a time of 2-10 minutes. The present invention realizes the rapid and large-scale preparation of non-densely packed photonic crystal structure color-forming fabrics by constructing an assembly working fluid, applying the assembly working fluid to the fabric surface, and then performing a three-stage process of assembly, sufficient water removal, and brightening.

The invention discloses a flexible actuator and a preparation method thereof. And combining the hydrogel film with the inverse opal photonic crystal structure with PDMS (Polydimethylsiloxane) to prepare the hydrogel stent actuator capable of treating cervical stenosis. The contact angle of the prepared hydrogel film with the inverse opal photonic crystal structure can reach 90 degrees or below, and the hydrogel film has strong affinity to water on a super-hydrophobic surface. Due to the super-hydrophobicity, the thin film can be tightly attached to an air-water interface while keeping self stable floating. The cervical stent disclosed by the invention has controllable adhesiveness, adjustable form, stimulation responsiveness and drug release property, the stent can be retained at the cervical part, and the application potential of the cervical stent in the aspect of treating cervical stenosis is shown.

To provide a single-mode surface emitting laser of high output.SOLUTION: A surface emitting laser includes an N-doped substrate, an N-doped clad layer, an active layer, a photonic crystal layer, a P-doped clad layer, and a P-doped contact layer formed in sequence from top to bottom. The photonic crystal layer includes a base material and a plurality of periodically arranged unit cells, and each unit cell includes a first different refractive index region, a second different refractive index region, and a third different refractive index region, all of which have a refractive index different from that of the base material. The surface emitting laser based on the photonic crystal structure is capable of maintaining a single mode operation property of the device even with a large mode field area. As a result, a single-mode surface emitting laser with high output can be obtained.SELECTED DRAWING: Figure 2

A two-dimensional photonic crystal surface emitting laser includes an n-doped substrate, an n-doped cladding layer, an active layer, a photonic crystal layer, a p-doped cladding layer and a p-doped contact layer arranged in sequence from top to bottom. The photonic crystal layer includes a base material and a plurality of unit cells arranged periodically, each unit cell includes a first different-refractive index region, a second different-refractive index region and a third different-refractive index region that have a different refractive index from the base material. The surface emitting laser based on the photonic crystal structure may maintain single-mode operating characteristics of a device under a large mode field area, so that a high-power single-mode surface emitting laser may be achieved.

Provided is a two-dimensional photonic crystal laser capable of transmitting a signal by laser light at a high S / N ratio. A two-dimensional photonic crystal laser (10) includes an active layer (11), a two-dimensional photonic crystal layer (12) having a two-dimensional photonic crystal structure in which a different refractive index portion (122), which is a portion having a refractive index different from a refractive index of a plate-like base member (121) laminated directly with the active layer (11) or with another layer, is two-dimensionally and periodically disposed in the base member (121), the two-dimensional photonic crystal layer (12) having a plurality of electric current injection regions (1201, 1202) having different resonance frequencies from each other, and an electric current supply unit (split electrode (172)) configured to supply a signal electric current in which a ratio of electric current intensity between the plurality of electric current injection regions (1201, 1202) changes with time into each of the plurality of electric current injection regions.

The invention provides a greenhouse light quality dynamic regulation and control system and method based on a photonic crystal chip. The method comprises the following steps: acquiring a parallel spectrum task sequence for an integrated layout; simulating a spectrum output process of the multi-layer photonic crystal structure according to the time sequence control protocol; if the deviation between the simulated spectrum output and the target spectrum distribution data exceeds a preset threshold value, adjusting the wave band modulation intensity of the independent subtask; whether the adjusted deviation meets the requirement or not is judged, and a final regulation and control parameter set is obtained; extracting a real-time switching rule from the final regulation and control parameter set; determining whether the light quality change triggers the real-time switching rule or not; if the light quality change triggers the real-time switching rule, obtaining a dynamic regulation and control instruction; driving the multi-layer photonic crystal structure to execute the parallel spectrum task through the dynamic regulation and control instruction; and acquiring light quality feedback data after the parallel spectrum task is executed.

The present invention relates to a liquid photonic crystal color paste, a preparation method, and its application in the rapid construction of large-scale photonic crystals, belonging to the field of photonic crystal structure color generation technology. The present invention solves the problem of difficult controllable large-scale preparation of high-concentration photonic crystal elementary nano-microsphere dispersions. It mainly solves the problem of H generation due to the thermal decomposition of the initiator by adding a pH regulator during the emulsion polymerization process. + , which lowers the pH of the polymerization system and reduces the emulsifying ability of the emulsifier molecules, thereby causing the problem of instability in the polymerization reaction system. A high-concentration photonic crystal elementary nano-microsphere dispersion is obtained by direct synthesis, and then a liquid photonic crystal colorant for the rapid construction of large-area photonic crystals is prepared based on the high-concentration photonic crystal elementary nano-microsphere dispersion.

The invention provides a composite photonic crystal semiconductor laser with a low 95% energy divergence angle, and is applied to the field of semiconductor lasers. The semiconductor laser comprises a substrate, an N-type limiting layer, a composite photonic crystal layer, an N-type waveguide layer, an active layer, a P-type waveguide layer and a P-type limiting layer which are sequentially stacked from bottom to top, wherein the composite photonic crystal layer is composed of a plurality of photonic crystal groups of different structures stacked in the epitaxial direction, and each photonic crystal group comprises a plurality of photonic crystal pairs of the same structure; the photonic crystal pair is formed by stacking a high-refractive-index waveguide layer and a low-refractive-index waveguide layer up and down, and the high-refractive-index waveguide layer and the low-refractive-index waveguide layer are alternately arranged in the composite photonic crystal layer. Through the composite photonic crystal structure, the light field distribution can be effectively regulated and controlled, so that 95% of energy divergence angle of the far field of the semiconductor laser is remarkably reduced.

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.

The application discloses a preparation method of hollow photonic crystal structural color glaze. The method uses monodisperse polystyrene latex balls as the main body, arranges the three-dimensional photonic crystal structure coating through a coating process, fills the gaps between the three-dimensional photonic crystal balls with inorganic materials and organic high-temperature-resistant materials as the main filling materials, and obtains the photonic crystal structural color glaze with a metallic visual effect after the photonic crystal coating after the filling is sintered at a high temperature of 350-1500 DEG C and a reverse opal three-dimensional photonic crystal structure is generated. The preparation method using the structural color principle to obtain the decoration effect can be applied to the existing ceramic, glass, metal and other product industries on a large scale, so that the products have better decoration effects.

According to embodiments of the present invention, a laser source is provided. The laser source includes a photonic crystal structure including a first domain having a plurality of first holes defined therein, the first domain being associated with a first set of Chern numbers, and a second domain having a plurality of second holes defined therein, the second domain being associated with a second set of Chern numbers, wherein the plurality of first holes and the plurality of second holes are arranged to define an interface region between the first domain and the second domain, the interface region defining an optical cavity for lasing. According to further embodiments of the present invention, a method for forming a laser source is also provided.