117 results about "Photonic crystal structure" patented technology

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 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.

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.

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 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.

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 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.

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.

Provided is a display device having a plurality of light-emitting elements arranged on a substrate, wherein each of the light-emitting elements is provided with: a photonic crystal structure including a light-emitting layer comprising a high-refractive-index layer formed from a compound semiconductor, a periodic structure comprising a plurality of columnar bodies provided in the light-emitting layer, and a resonator formed by a defect that disturbs the periodic structure; and a pair of low-refractive-index layers sandwiching the light-emitting layer from above and below, and the film thickness of the light-emitting layer is 0.4-1.6 times the period length of the periodic structure.

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.

The application discloses a kind of self-adapting bimodulus photoelectric gel interface materials and its preparation method and application, belong to flexible electronic material and wearable human-computer interaction system technical field, the application is by introducing SiO2 photonic crystal structure into hydrogel, and doping ionic liquid [EMIm]Cl, so that the self-adapting bimodulus photoelectric gel interface material prepared has optical and electrical double signal sensing function.The application is based on betaine zwitterionic hydrogel and SiO2 photonic crystal structure, with high conductivity, frost resistance and water retention capacity, realize strain-resistance-structural color signal synergistic regulation and control.The self-adapting bimodulus photoelectric gel interface material prepared by the application has better tensile rate, can be fitted to skin, has high sensitivity and fast response of micro-strain, has sensitive electrical signal transmission ability and high transparency, avoids the influence on structural color, and has gorgeous structural color, has strong frost resistance and good stability.

The invention provides a topological interference power divider, a power control method and related equipment. The topological interference power divider comprises a dielectric substrate; the upper copper layer and the lower copper layer are arranged on the surface of the dielectric substrate; the valley photonic crystal structure is composed of triple symmetric apertures of periodic triangular lattices etched on the upper copper layer; the structure comprises A-type unit cells and B-type unit cells which are alternately arranged, the topological waveguide channel is a domain wall formed by the interface of the A-type unit cell and the B-type unit cell, and the channel comprises a plurality of branches which are intersected in a central area to form a coherent interference area; the input port and the output port are respectively arranged at the head end and the tail end of the topological waveguide channel; a matching network is arranged between each port and the channel and is used for realizing conversion between a conventional guided wave mode and a topological edge state; the modulation of the output power distribution ratio, the central working frequency or the transmission bandwidth of the topological interference power divider can be realized by regulating and controlling the topological edge state in the coherent interference region, and the flexibility and the reconstruction capability of power distribution are improved.

The invention discloses a POCT (Point of Care Testing) microfluidic detection chip carrying a photonic crystal structure color coding microcarrier and a preparation method of the POCT microfluidic detection chip. The POCT chip comprises a high-definition and high-transparency cover glass used for packaging and visual detection and a chip main body used for placing the photonic crystal structure color coding microcarrier. And the liquid inlets on the chip main body are uniformly dispersed into the reaction chamber of the chip through the multi-stage flow channel. The reaction chamber comprises a plurality of limiting columns which can separate different microcarriers, so that each microcarrier can be in uniform contact with reaction liquid. After the microcarrier is placed on the chip main body in a random mode, the chip main body is packaged by cover glass and biological glue. Due to the fact that the whole chip is subjected to hydrophilic treatment, when an extremely small amount of to-be-detected sample is dropped into the liquid inlet, reaction liquid can rapidly infiltrate the interior of the whole chip and react with the coding microcarrier in the chip. And after incubation for half an hour, washing the residual sample with a buffer solution, and finally reading the result. According to the invention, trace unknown samples can be detected in a short time, and development of on-site rapid detection can be promoted.

The present application belongs to the technical field of structural color, and particularly relates to a kind of colloidal photonic crystal ink, a kind of colloidal photonic crystal structural color and a preparation method thereof.The preparation method provided by the present application adjusts the surface tension and viscosity of the colloidal photonic crystal ink, so that it is suitable for pattern printing;then, the preparation method of the colloidal photonic crystal structural color provided by the present application uses a substrate treated by hydrophobic treatment (OTS treatment) on one hand, which can reduce the pinning of three-phase line, promote the inward movement of nanoparticles and promote the ordered and close self-assembly;on the other hand, through the method of inverted evaporation self-assembly, the Marangoni flow is enhanced, the inward movement of nanoparticles is promoted, and the ordered and close self-assembly process is promoted, so that the colloidal photonic crystal micro-dome has a higher height-diameter ratio, thereby improving the brightness and saturation of the structural color, and providing a new method for optimizing the color quality of the structural color.

The application relates to a low-layer one-dimensional infrared low-emissivity film structure which is insensitive to polarization and incident angle. The technical scheme is as follows: the low-layer one-dimensional infrared low-emissivity film structure is composed of a one-dimensional lambda / 4 periodic photonic crystal structure and a quasi-periodic photonic crystal structure, the last layer of the one-dimensional lambda / 4 periodic photonic crystal structure is connected with the top layer of the quasi-periodic photonic crystal structure. The low-layer one-dimensional infrared low-emissivity film structure is expressed by the following formula: (AB) 2 (CD) 5 ; wherein: (AB) 2 represents the one-dimensional lambda / 4 periodic photonic crystal structure, (AB) represents a sub-periodic photonic crystal structure in which Ge and ZnO are arranged in sequence; (CD) 5 represents the quasi-periodic photonic crystal structure, and (CD) represents a sub-quasi-periodic photonic crystal structure in which Ge and ZnO are arranged in sequence. The application has the characteristics of few layers, short production cycle, high reliability, realization of double-band low emission and insensitivity to polarization and incident angle.

The present application provides a kind of micro light emitting element and its preparation method, by setting epitaxial stack on the surface of non-doped semiconductor layer, the epitaxial stack at least includes along sequentially stacked first type semiconductor layer, second active region and second type semiconductor layer;And, the second electrode led out on the second type semiconductor layer and the first electrode led out on the first type semiconductor layer;And, the exposed surface of the epitaxial stack is provided with mirror.Wherein, the non-doped semiconductor layer is provided with first active region interlayer, and photonic crystal structure is arranged on the non-doped semiconductor layer, so that at least part of the photons released by the second active region is reflected by the mirror, and after being absorbed by the first active region interlayer, it is emitted along the normal direction of the first active region interlayer through the photonic crystal structure.

The application discloses an ultrahigh-sensitivity photonic crystal chip, a preparation method thereof and application of the photonic crystal chip in detection of CGRP. The photonic crystal biological chip comprises a photonic crystal structure and an immune detection system; the immune detection system is fixed on the photonic crystal structure, the immune detection system contains antibodies of a biological detection marker; and the photonic crystal structure is formed by self-assembly of photonic crystals on a base material. For detection of CGRP, a target object which is easy to degrade and has an ultralow concentration, the application provides a quick and simple detection method and an optical detection platform. Compared with ELISA detection which needs several hours of detection time, the detection platform of the application is simple to operate and quick in detection (only 10 minutes are needed).

The ultrahigh-fineness optical fiber FPI sensor based on the cavity optical mechanical effect comprises a transmission optical fiber, an optical microcavity and a sensitive film which are connected in sequence, and the sensitive film is provided with a two-dimensional photonic crystal structure formed by periodically arranging a plurality of nanopores. And the photonic band gap of the two-dimensional photonic crystal structure covers the working wavelength of the ultra-high-fineness optical fiber FPI sensor. According to the ultra-high-fineness optical fiber FPI sensor, the Young modulus of the sensitive film is effectively reduced while the reflectivity of the sensitive film is improved. The invention further discloses a preparation method of the ultra-high-fineness optical fiber FPI sensor.

The present application relates to a kind of energy valley photonic crystal structure, optical waveguide and angular state structure.The energy valley photonic crystal structure described in the present application realizes energy band inversion by changing the ring width of circular ring silicon dielectric column, and has higher stability without changing unit cell position.The optical waveguide proposed in the present application has selectivity to left-handed circularly polarized light and right-handed circularly polarized light, and can realize valley polarization light selective coupling and transmission of pseudo-spin and energy valley locking;It also has high efficient light transmission characteristics and anti-scattering robustness, and its transmission efficiency can reach 98% in the frequency range of 155-173THz.The angular state structure proposed in the present application can realize four different frequency topological angular states, and the four topological angular states can not only be realized singly, but also can coexist in fixed photonic band gap through structure design.

The frequency doubling separator comprises a first photonic crystal structure PC1, a second photonic crystal structure PC2 and a first photonic crystal structure PC1, the first photonic crystal structure PC1, the second photonic crystal structure PC2 and the first photonic crystal structure PC1 are sequentially connected from top to bottom to form a three-layer heterostructure, the PC2 is located in the middle layer, and the PC1 is located in the middle layer. An upper interface for transmitting fundamental frequency light (FW) is formed on the contact surface of the upper layer PC1, and a lower interface for transmitting second harmonic (SHW) is formed on the contact surface of the lower layer PC1. A PC1-PC2-PC1 three-layer heterostructure is adopted, nonlinear frequency conversion and wavelength demultiplexing functions are integrated on a single chip, the device size is remarkably reduced, the system integration degree is improved, and the urgent requirement of a modern optical communication system for compact integration is met; a body defect design is also introduced, a second harmonic emission port is flexibly adjusted, and the practicability is enhanced; the topological structure is insensitive to defects, inhibits backscattering, improves stability, and provides a high-performance and high-reliability solution for the fields of optical communication and the like.