251 results about "Photon crystal" patented technology

The disclosed sensor is gas sensor of optical crystal fiber with hollow core. The air sensor includes light source, light guiding gas-cell light path, reference light path of general optical fiber, and signal conversion part. Through general optical fiber, and light splitter, the light guiding gas-cell light path is connected to light source. Being setup at another end of the light guiding gas-cell light path and the reference light path, the said signal conversion part including photodiode, and phase-locked amplifier is in use for providing signal for circuit of monitoring external gas concentration. Optical crystal fiber with hollow core of containing gas permeable micropores in micro level is adopted in the light guiding gas-cell. Comparing current optical fiber gas sensor, the invention possesses advantages: simple system, easy of controlling absorbed light path, and coupling loss. The invention raises effective absorbed light path, and response seeped of parts so as to suit monitoring gas in site.

The invention discloses a miniature full optical fiber F-P acceleration transducer, which comprises: a common single mode optical fiber, a hollow-core optical fiber and a solid-core photon crystal fiber; and the common single mode optical fiber, the hollow-core optical fiber and the solid-core photon crystal fiber are sequentially connected in fusing way. The acceleration transducer is characterized in that: a plurality of sector via holes which are concentric with the cross section of the solid-core photon crystal fiber are formed at the axis direction of the solid-core photon crystal fiber, the separation parts of each sector via hole form a shaking arm, a ring shape is formed by all sector via holes and the shaking arm together, and a shaking block is formed by the part which is surrounded by the ring shape. The invention also discloses a producing method of the miniature full optical fiber F-P acceleration transducer. The acceleration transducer has the beneficial effects that: the transducer is miniaturized through full optical fiber and can bear high temperature, the operation is simple, the sensitivity is high, the response speed is swift and the hard environment endurance is strong.

The invention discloses a hallow photonic crystal fiber based non-intrinsic fiber FP interference sensor composed two ordinary communication single-mode optical fibers 2-2 and a hallow photonic crystal fiber 2-3, the two ends of which are welded with one end of two ordinary communication single-mode optical fibers 2-2, otherwise, one end of one ordinary communication single-mode optical fiber 2-2 is coated with Ti203 film with diameter of 20um-30 um. The invention also discloses the production method of the sensor. The available technical effects of the invention are: (1) the temperature coefficient of EFPI sensor of the invention is small, and capable of working under temperature of 600 deg; (2) when the cavity length of the FP sensor is extended to several centimeter (the cavity length of traditional FP sensor is several hundred microns to millimeter in order), the stripe contrast is high, thereby establishing the foundation in the application of high capacity, quasi-distributed sensing system.

The invention relates to a method to generate three refraction rates plasma photonic crystal, which uses the following discharge device to reach the goal: the basic structure of discharge device includes two symmetric closed dielectric containers, and between the two containers setting the discharge gap, in the containers, setting discharge electrode fuses, and importing the water into the containers to form the discharge electrodes; by changing the discharge conditions, including changing the applied voltage frequency and amplitude, and the discharge gap shape border and aspect ratio, discharging will produce three refraction rates plasma photonic crystal structure with different cycles, and different lattice constants. Since the electronic density in the plasma channel has the three orders of 1015cm, theoretical studies indicating that such high electronic density is enough to enable the plasma photonic crystal having band gap structure, to prevent the spread of certain frequency lights, and having frequency-selective optical switching function, which has a broad application prospects in the industrial field.

The invention belongs to the technical field of photoelectricity, and provides a super-continuum spectrum light source and a coherent anti Stokes Raman scattering imaging system. The super-continuum spectrum light source comprises a laser which is used for generating laser pulses, and a super-continuum spectrum is generated through laser pulse pumping full-orthochromatic scattered photon crystal optical fibers. Due to the fact that the super-continuum spectrum is generated through the laser pulse pumping full-orthochromatic scattered photon crystal optical fibers, a single pulse is kept in a time domain, good flatness and continuity exist in a frequency domain, and high light spectrum power density is provided. Meanwhile, relative time delay between light spectrum components of different frequency is short, the spectrum consistency is good, and the light spectrum range is wide. Therefore, the super-continuum spectrum produced by the super-continuum spectrum light source is wide in application range.

The method imposes external electric field on microball cladded in microcapsule between two parallel electrode panel and the microballs are directional-moved and order-arranged under the action of the external electric field because of electric charge of itself so colour display can be obtained by totally reflecting light mating to the wavelength. Since the present invention applies method of varying external electric field i.e voltage to adjust ball arrangement state i.e ordering structure period of photon crystal, the aim of colour display can be achieved by generating different, reflection light.

The invention discloses a brightly colorful contact lens which is characterized by being prepared by using a method comprising the following steps of: (1) preparing structural color hydrogel with an inverse opal photon crystal structure by using a sequenced colloid nano particle photon crystal structure as a template through a colloid crystal template method; (2) paving the structural color hydrogel with the inverse opal photon crystal structure in a PV (polyvinyl) mould of the contact lens; adding the contact lens standard hot-solid liquid to completely permeate into the network structure ofthe hydrogel; processing the thermal solidification sequence to form the initial film of the contact lens; immersing the initial film of the contact lens in a standard saline water solution to process hydration treatment until swelling is in equilibrium. Compared with other colored contact lenses, the brightly colorful contact lens is beautiful in appearance, good in biological compatibility and good in practicability.

The invention discloses a metal wire filled near-diamond big air hole inner cladding polarized photon crystal fiber, which has the key point of the technical scheme that the metal wire filled near-diamond big air hole inner cladding polarized photon crystal fiber consists of a fiber core 1, a background material 2, big cladding air holes 3 and 4, small air holes 5 and filling metal wires 6, wherein the big cladding air holes are evenly distributed in a regular triangle array; the center air hole is missing to form a core area; the air holes of different sides on two orthogonal-polarization directions form a fiber high double-refraction area; one or two metal wires are selectively filled in a second layer of air holes; and the background material of the fiber is quartz material. The metal wire filled near-diamond big air hole inner cladding polarized photon crystal fiber disclosed by the invention is used in a fiber system, and a polarized beam splitting filtering function at different wavelength points can be realized. The filtering effect on different wavelength positions can be realized by properly selecting the size of the filled metal wires. A fiber filter is easy in integrating with the fiber system so as to adapt to the miniaturization and integration development of the optical system.

The invention discloses a double-coating large-mode-area photon crystal flysecond laser directly obtaining micro joule-level single pulse energy, belonging to the field of laser technique and nonlinear optics, where the laser main body is based on double-coating large-mode-area photon crystal optical fiber of polarization-protection structure and adopts high-power LD laser to directly pump; the laser uses grating pair to compensate dispersion, starts mode locking with the help of semiconductor saturable absorber mirror (SESAM), and controls polarization by wave plate and polarization beam splitter and implements tunable output; laser resonant cavity keeps net positive dispersion inside and runs in self-similar mode locking mode and outside-cavity dispersion compensation is made on the output pulse and the pulse is 100-200fs wide. And the advantages: the laser has good stability, and the output pulse has high energy and high repeating frequency. And the invention can effectively avoid split of pulse running at high energy.

The invention provides a magneto-optic effect photon crystal fiber and manufacturing method thereof, wherein the fiber comprises a fiber core, a gas hole cladding layer and a covering layer, the fiber core material comprises pure quartz doping GeO2 having improved refractive index and rare earth Tb3, Al3 ions having increased Faraday magnetooptical effect, the gas hole cladding material comprises light quantum crystal structure capillary quartz tube in symmetrical hexagonal regular arrangement, the protective covering employs supported quartz tube. The optical fiber preparing process comprises the three steps of making doped terbium rare-earth optical fiber core stick, making optical fiber preformed stick and drawing magneto-optic effect photon crystal fiber.

The present invention relates to external-applied electric field controlled colloidal particle self-assembly and preparation method of three-D photon crystal. Said method includes the following steps: firstly, regulating pH value of prepared silicon dioxide isometric microsphere suspension to 4-12, then applying D.C. external electric field in the microsphere suspension, field intensity is 50-500 V / cm, to make microspheres with some specific charge implement orientated deposition on the plate of flat conductive glass under the action of external electric field so as to form the three-D periodicity template with long-range order.

The present invention applies microprocessing technique to utilize high refractive index of semiconductor material to prepare high quality of two-dimensional photon crystal with defect state and optical switch can be realized by utilizing high third order-nonlinear polarizability and quick response time of semiconductor material. The produced optical switch can be widely used in field of optical communication and optical computer.

The method is: Put many glass pipe in order to form a specific structure (photon crystal optical fibre prefab stick) in the glass cannula. The thin glass pipe is longer then the others. The equipment controls the pressure of photon-crystal optical fibre prefab stick. In another word is to vacuum the glass cannula, to input the thin glass pipe of 10 -1 mbar air.

The preparation process of prefabricated rod for photon crystal fiber includes the following steps: preparing capillary with sealed ends, outer glass pipe with one sealed end and glass core rod; setting the glass core rod inside outer glass pipe coaxially and arranging the capillaries orderly inside the outer glass pipe; setting the filled outer glass pipe inside fiber heating furnace with the opened end upwards; starting the vacuum pumping set and the heater to reach the required vacuum degree and temperature, moving the filled outer glass pipe downwards with the feeding mechanism for one period of homogeneous heating, and cooling to form the prefabricated rod for photon crystal fiber. The present invention has no interface scattering.

A process for preparing photon crystal from aluminium oxide nanotemplate includes such steps as dissolving the oxidized surface layer of Al sheet, and alternatively high-voltage anodizing and low-voltage anodizing more times to generate the periodic variation of aluminium oxide nanostructure on the surface of Al sheet, resulting in periodic pore structure.

The invention relates to a brush-like block copolymer with macromolecules at chain ends and a preparation method thereof, belonging to the technical field of high-polymer crystalline materials. The block copolymer provided by the invention can form ordered nano-structure photon crystals by self-assembly, and has the characteristic of adjustable chemical and mechanical properties. The chemical expression of the block copolymer is (N-PMMA)y-b-(N-PS)x, and the molecular weight is 3*10<5>-4*10<6>; in the expression, x=y; N-PMMA is norbornene polymethyl methacrylate macromolecule monomer of which the number-average molecular weight is 6000; and N-PS is norbornene polystyrene macromolecule monomer of which the number-average molecular weight is 6000. The preparation method of the brush-like block copolymer is a ring-opening metathesis polymerization method; and the block copolymer prepared by the method has very low winding of the side chain, and can quickly form the ordered nano-structure photon crystals by self-assembly.

The invention belongs to the technical field of preparation and application of colloid photon crystals and in particular relates to a method for preparing the self-supporting colloid photon crystal with a large area through a co-crosslinking self-assembling method. The preparation method comprises the following steps of: mixing an aqueous emulsion with monodisperse emulsion particles in a certain concentration, a polymerizable monomer, an initiator and a crosslinking agent according to a certain ratio by taking an elastic material as a self-assembling substrate, dispensing a mixture or roller painting the mixture on an elastic hydrogel substrate for co-crosslinking self-assembling, polymerizing the polymerizable monomer and the crosslinking agent in the gap among monodisperse emulsion particles in the self-assembling process, evaporating water and then drying to form a self-supporting three-dimensional colloid photon crystal film periodically arranged. The self-supporting colloid photon crystal has favorable optical performance and potential application prospects in the aspects of optical element, integrated optical circuit, sensor, and the like.

The invention provides a humidity-sensitive allochroic anti-counterfeiting functional material which comprises a photon crystal and a component B, wherein the photon crystal and component B form a component-B-base liquogel system; the photon crystal is a component A which is distributed in the component B in a periodic dot matrix mode in the form of particles; and the volume changes as the humidity of the component B changes. The particles in the component A are distributed in a dot matrix mode to form the three-dimensional photon crystal, thereby displaying the specific color; the component B has the swelling characteristic, and the volume changes as the humidity changes; and therefore, the dot matrix period parameters of the photon crystal formed by the component A can change as the swelling characteristic of the component B changes, so the defined wavelength can change, thereby displaying different colors and further implementing the anti-counterfeiting function. The color of the humidity-sensitive allochroic anti-counterfeiting functional material is determined by the dot matrix period parameters of the photon crystal formed by the component A, and thus, the material has high reliability and can not be easily imitated.

The invention provides a photonic crystal fiber fluorescence temperature sensor measurement system, which comprises a light source, a photonic crystal fiber fluorescence temperature sensor and a spectrometer, wherein, the light beam emitted from the light source is coupled with the photonic crystal fiber fluorescence temperature sensor; and the spectrometer is used for measuring the fluorescence spectrum emitted by the photonic crystal fiber fluorescence temperature sensor so as to measure the temperature according to the fluorescence characteristic of the photonic crystal fiber fluorescence temperature sensor. According to the invention, the sensitivity of the photonic crystal fiber fluorescence temperature sensor can be greatly improved by filling a fluorescent material in the photonic crystal fiber fluorescence temperature sensor.

The invention relates to a polarization interference multi-element CARS (Coherent Anti-stokes Raman Scattering) microscopic imaging method. The method comprises the steps that: high and heavy frequency polarization femtosecond laser is taken as a probe light of a CARS signal, and a part of the high and heavy frequency polarization femtosecond laser after beam splitting is taken as pump light pump PCF (Photon Crystal Fiber); and the output of a super continuous spectrum generated by the PCF is divided into two parts, a part is taken as a first Stokes exciting light, the other part is taken as a second Stokes exciting light after the polarization angle of the super continuous spectrum is changed by a half wave plate, and a CARS microscopic image is obtained through a confocal microscopic optical path and a spectrum analysis system. The polarization interference multi-element CARS microscopic imaging method provided by the invention has the advantages that: femtosecond CARS probe light and two beams of the super continuous spectrum Stokes exciting lights generated by the pump PCF after the beam splitting are subjected to polarization interference, and polarized component in some one direction is extracted and a peak-to-peak value after interference enhancement is selected through a polarization analyzer, thus the influence of off-resonance background noise of a sample can be eliminated, and the CARS microscopic image with high contrast and broad band is obtained.

The invention relates to a photonic crystal fiber coupling method and a coupling device thereof. The method comprises the following steps of: determining the equivalent mold field radius of a photonic crystal fiber to be connected according to the specific parameters; selecting a corresponding extender lens and a focusing lens element according to the specific parameters of the photonic crystal fiber to be connected, and calculating the lens coupling optical path to determine a group of distance values for instructing the actual adjusting process; and adjusting the actual coupling optical path according to the distance parameters calculated in step 2 to obtain the minimal loss state, and carrying out a packaging connection. The device comprises a first and a second pins for fixing corresponding one ends of the photonic crystal fiber and a corresponding coupling optical fiber; the extender lens and the focusing lens arranged between the first and the second pins; and an engagement portion for respectively sheathing the first pin and the extender lens as well as the focusing lens and the second pin at the outer periphery of the engagement portion to package the elements; and an outer sleeve for entirely packaging and fixing the elements. The invention has the advantages of simple connection process, high optical fiber coupling efficiency and high connection strength and can eliminate loss resulting from mismatch of mold fields.

The invention discloses a manufacturing method for a full optical fiber high-pressure gas chamber based on a hollow-core photon crystal fiber. The steps of the invention are as follows: a) two ends of a hollow-core photon crystal fiber (1) are respectively communicated with an airtight A chamber (2) and an airtight B chamber (3), and one end of gas distribution equipment (4) is communicated with the airtight B chamber (3), and the other end of the gas distribution equipment (4) is respectively connected with a vacuum pump (5) and a gas source (6) to be inflated; b) the airtight B chamber (3) is connected with the vacuum pump (5) through the gas distribution equipment (4) first, after the required vacuum degree is achieved, the airtight B chamber (3) is connected with the gas source (6) to be inflated again through the gas distribution equipment (4) until air pressure of the airtight A chamber (2) is more than or equal to one atmospheric pressure; c)the two ends of the hollow-core photon crystal fiber (1) are successively welded with a standard single film fiber (10) within a range of less than or equal to 1.5 min; d) a distillation function p(x) of air pressure of a fiber core in the hollow-core photon crystal fiber (1) is derived from a formula p(x)=p(1)(-c+a2-bx); e) a final air pressure value of the full optical fiber high-pressure gas chamber is calculated by more than one p(x). The p(x) can accurately determine the air pressure value of the full optical fiber high-pressure gas chamber.

A color filter consists of base and color filtering layer being set on base plate and being formed by red photon crystal structure with multiple the first holes, green photon crystal structure with multiple the second holes and blue photo crystal structure with multiple the third holes. It is featured as setting holes diameter of the first holes to be less then that of the second ones and hole diameter of the second holes to be less than that of the third ones.

The present invention belongs to the field of fiber communication and optical signal processing, and is especially the design of double core photon crystal optical fiber as one photon device with polarizing split function. The double core photon crystal optical fiber includes one coating layer of low refractive index area formed by pore structure in regular lattice nodes and two high refractive index core areas formed by pore deletion in regular lattice nodes. The present invention features different pore size near the two core areas in two orthogonal polarization directions, unsymmetrical pore deletion, the deflection of the pore center near the core areas to the lattice nodes, or filling of polar material in the pores near the core area. Each of the core areas can produce high double refraction, so that two polarized light beams have great length difference and can be polarizing split in short distance.

The invention relates to a device and a method for generating a double-layer plasma photon crystal. The device comprises a vacuum reaction chamber, two water electrodes and a plasma generation power supply, wherein the two water electrodes are arranged in the vacuum reaction chamber and provided with opposite pole plates; and the plasma generation power supply is electrically connected with the water electrodes. The device is characterized in that two borders with different thicknesses, which are used as the boundaries of a discharge air gap, are arranged between the two water electrodes; a dielectric plate is arranged between the two borders; and the borders and the dielectric plate are respectively perpendicular to the axial lines of the two water electrodes. According to the device and the method disclosed by the invention, the double-layer plasma photon crystal is realized for the first time; and the double-layer plasma photon crystal has the advantages of fixed lattice constant proportion and different symmetries and achieves the purpose that optical transmission is regulated by regulating lattice symmetry, so that the double-layer plasma photon crystal has wide in application field and application prospect.

The invention relates to a chromatic optical filter with a polarization function based on one-dimensional metal photon crystals in the technical field of a purely-flat liquid crystal display, which comprises a basal plate, a plurality of light absorption matrixes and one-dimensional submicron metal gratings, wherein the light absorption matrixes are regularly distributed at the surface of the basal plate, one one-dimensional submicron metal grating with a specific period is arranged in each light absorption matrix, the light absorption matrixes correspond to the sub-pixels of a panel of the purely-flat liquid crystal display, three light absorption matrixes form a unit which corresponds to one pixel of the panel of the purely-flat liquid crystal display, and three one-dimensional submicron metal gratings are respectively arranged on the lattice points of the three light absorption matrixes fixedly. The invention utilizes the diffraction of non-absorptive type optical gratings for optical filtering and can enhance the optical efficiency and lower the power consumption; meanwhile, the optical filter has polarization penetration property and can replace a front polarization piece in a liquid crystal panel, lowers the cost and enhances the integration degree.

The invention relates to a method for preparing a colloidal photon crystal composite film with humidity responsiveness and patterning by improving a humidity response speed through introducing poly (N-isopropylacrylamide). The method for preparing the colloidal photon crystal composite film comprises the following steps of: taking a mixed solution consisting of monodispersed emulsion particles, humidity responsiveness functional monomers, N-isopropylacrylamide monomers, a crosslinking agent, an initiator, a high boiling-point auxiliary and water as ink, printing the ink on the surface of a substrate with wettability in an inkjet manner, and obtaining a patterned colloidal photon crystal composite film composed of microdrop units with the humidity responsiveness, wherein the piled monodispersed emulsion particles are used as frames for the microdrop units with the humidity responsiveness, and crosslinked copolymers with the humidity responsiveness, obtained by crosslinking the humidity responsiveness functional monomers with the N-isopropylacrylamide monomers, are filled in the gaps of the frames.

The invention discloses a method for preparing a thin film type photon crystal lattice structure GaN-base luminescent diode, which belongs to field of GaN-base luminescent diode. The method includes: growing a multilayer GaN-base luminescent diode material on a sapphire substrate, which including a non-doping GaN layer, a n-type GaN layer, a multi-quantum trap and a p-type GaN layer; preparing a GaN-base luminescent diode on the GaN-base luminescent diode material; uniformly coating a layer of organic polymer on the sapphire substrate; forming a photon crystal lattice structure on the organic polymer by coining template; irradiating the sapphire substrate by laser from one surface of the organic polymer with the photon crystal lattice structure until the sapphire substrate and the non-doping GaN layer are separated, synchronously, forming a photon crystal lattice structure for the non-doping GaN layer. The method of present invention is adapted for preparing large-area thin film type photon crystal lattice structure GaN-base luminescent diode and can be industrially applied.

The invention relates to a light guide plate with a polarization function based on one-dimensional metal photon crystals in the technical field of a liquid crystal display, which comprises a light output face, a bottom face, at least one light input face and a plurality of side faces, wherein the light output face and the bottom face are oppositely arranged, the light input face is connected with the light output face and the bottom face, an array comprising a plurality of lattice points is arranged on the light output face, and one one-dimensional transmission type metal photon crystal is arranged in each lattice point. The invention can enable emergent light to be uniform, enables non-polarized light emitted by a light source of a back light system to be transformed into linearly-polarized light for emergence by the polarization transformation function of the one-dimensional reflection type metal photon crystals and the polarization selecting penetration property of the one-dimensional transmission type metal photon crystals, can reduce energy loss caused by a front polarization piece, enhances the efficiency and even replaces the front polarization piece, thereby simplifying the structure of the light guide plate and lowering the cost.

The invention discloses a hydrogen concentration detecting device which comprises a hydrogen sensing head (10), an integrated optical signal module (2) and a signal processing unit (3) which are connected mutually, wherein the hydrogen sensing head (10) comprises a polarization-maintaining photon crystal sensing optical fiber (1) plated with a palladium membrane, a first optical fiber coupler 4a, a protecting sleeve (5), an optical fiber fixing frame (6), an optical adapter (7) and a tail fiber jacket (14); and the integrated optical signal module (2) comprises a light source (8), a spectrum receiving device (9) and a second optical fiber coupler 4b. An optical path adopted by the device is reliable and stable in performance; the adopted polarization-maintaining photon crystal optical fiber plated with a palladium membrane is good in material consistency and has good temperature insensitivity; and the membrane plating length of a hydrogen-sensitive palladium membrane can be designed according to the requirements on sensitivity so as to realize the high sensitivity detection. The device is not sensitive to the change of temperature, and is simple in system structure, convenient to operate, strong in interference resistance and high in precision.