40 results about "Metallic photonic crystal" patented technology

The solution method for preparing metal photonic crystal belongs to the technical field of nano photoelectron materials and devices thereof. The existing method for preparing metal photonic crystal is faced with the problems such as high cost, low efficiency and small area of preparation, etc. In the invention, sequentially, optical resist is rotatably coated on a substrate; the interference photolithography is adopted to prepare one-dimensional or two-dimensional nano optical grating structures; metal nano particle sol is rotatably coated and goes through low temperature heat treatment, thus obtaining the metal photonic crystal. The invention has the advantages of low cost, high efficiency and preparation of the metal photonic crystal in a large acreage and the like.

The invention discloses a two-dimensional metallic photonic crystal-based light guide plate with a polarization function, which comprises a light guide plate substrate, a metallic photonic array, a metal layer and a one-dimensional grating, wherein the metallic photonic array is positioned on a light emitting surface of the light guide substrate; the metal layer and the one-dimensional grating are respectively positioned on the bottom surface of the light guide substrate opposite to the light emitting surface; and an light incidence surface and a side surface are positioned between the light emitting surface and the bottom surface of the light guide substrate respectively. Because a transmission type metal grating and a reflection type metal grating are directly manufactured on the light guide plate, the structure of a backlight system is simplified and the thickness of backlight is reduced; and a two-dimensional transmission type grating can regulate light-emitting performance in two directions, so the design flexibility is increased.

Provided is a method for preparing a two-dimensional metallic photonic crystal structure in large area through femtosecond laser direct writing. The invention provides a method and experiment device for preparing the periodically-distributed two-dimensional photonic crystal structure with the feature size being the sub-micron dimension in one step in the large area by focusing identical-wavelength double-pulse femtosecond laser on the surface of metal through a plano-convex cylindrical lens, and the identical-wavelength double-pulse femtosecond laser is obtained based on the spectrophotometry of birefringent crystals and has the features of collinear transmission, cross polarization and picosecond time delay. Two-dimensional periodic structure patterns can be effectively regulated and controlled by changing the energy and the number of pulses of input laser, the thicknesses and the azimuth angles of the birefringent crystals and the like. Through the combined design of different linear polarization directions and the variable time delay feature of two femtosecond laser pulses and focusing of the cylindrical lens, preparation of the two-dimensional metallic photonic crystal structure within the large area is achieved conveniently and quickly. The novel preparation method adopting the double-pulse femtosecond laser with cross polarization and variable time delay has potential important applications in the field of material micro-nano processing and preparation.

The invention discloses a photonic crystal waveguide terahertz modulator for modulating terahertz waves at high speed. The surface of a silicon photonic crystal pillar array of wired defect waveguide is plated with a layer of vanadium dioxide film, the vanadium dioxide film without laser irradiation at room temperature is a medium phase and the member shows a band gap property of medium photonic crystal waveguide; when the surface of the photonic crystal pile is irradiated by laser, phase change occurs to the vanadium dioxide film and a member shows a bond gap property of metal photonic crystal waveguide. Because the conduction bands of the medium and the metal photonic crystal waveguide of a same structure are completely different, the terahertz strength modulation and frequency modulation of a light-controlled high speed broad bond can be realized. The terahertz modulator modulates the bond width largely, that is, more than 100GHz; the modulation mode is flexible and various and can realize multi-window strength modulation and frequency modulation; the modulation depth is more than 90%; the response time is short and the modulation speed is 100Gbps; and the structure and the modulation method are simple and convenient for minimization and integration, and can meet the requirement on a terahertz communication system.

The invention discloses a one-dimensional metallic photonic crystal plano-concave mirror for cylindrical symmetrical vectorial light beam focusing, and relates to the field of light field regulation in sub-wavelength photonics. The plano-concave mirror is composed of a one-dimensional metallic photonic crystal with metallic layers and dielectric layers arranged periodically and alternatively, and along the periodic photonic direction of the photonic crystal, one side is a plane while the other side is a hemispherical concave surface. By making full use of negative refraction properties and simultaneous orthogonal polarized light regulation capacity of the photonic crystal, the structure can effectively focus radial and spiral polarized light, and sizes of focused light spots reach sub-wavelength magnitude. In other words, by the structure, sub-wavelength focusing of cylindrical symmetrical vectorial light beams of any polarization component can be realized. By changes on constituent materials and structural parameters, focusing effect can be realized within broadband. The plano-concave mirror is simple in constituent material, easy for designing parameters and structurally easy to produce, and has good application prospects in the fields of near-field optics, quantum optics and the like.

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 Terahertz tunable filter device of a metal photonic crystal and a control method thereof. A photonic crystal metal column array is encapsulated in a high-density polyethylene box which is filled with liquid crystals. The pointed angles of the liquid crystal molecules filled around the metal column are changed by controlling voltage, so that the energy band and band clearance position of the metal photonic crystal is changed to control the movement of a filter passband position and realize the function of tunable filtering. As a metal material is adopted to manufacture the photonic crystal, the shortcomings that the passband width is narrowed and the transmission rate is reduced in the tuning process of a medium photonic crystal are conquered; and the turning range of the photonic crystal is greatly extended. As the metal column serves as a special structure of an electrode, so that the distance between the anode and cathode is reduced; the consistency of liquid crystal distribution is improved; the working voltage is reduced and the response time is enhanced. The Terahertz tunable filter of the metal photonic crystal disclosed by the invention has the advantages of wide transmission band width and tunable range, stable passband width and transmission rate in the tuning process, less power consumption and high extinction ratio and is convenient for minimization and integration.

The invention provides a dielectric-metal photonic crystal, a preparation method thereof and a tera-hertz pulse generator. The dielectric-metal photonic crystal has a multilayer composite structure represented in the following formula: [dielectric layer/metal layer]n/insulating substrate, wherein n is an integer in 1-10. The metal layer has a multilayer structure which is formed through alternatively combination of magnetic nanometer films and non-magnetic nanometer films. Compared with the prior art, the dielectric-metal photonic crystal according to the invention is advantages in that a specific structure is utilized, laser energy can be absorbed to a greater extent for exciting each metal layer to generate the tera-hertz pulse on one hand, and on the other hand, the tera-hertz pulses which are generated by the metal layers can be overlapped in a coherent manner, thereby greatly improving tera-hertz strength. The dielectric-metal photonic crystal applied to the tera-hertz pulse generator can maximally utilize femto second laser energy, thereby greatly improving tera-hertz strength and realizing wide frequency spectrum and adjustable polarization.

The invention discloses the separator of polarization light beam with high degree of polarization in the visible light wave band by using the metal photon crystal structure. The medium sticks in two dimensions array structure are formed on the substrate. The said two dimensions array structure can be square lattice or hexagonal lattice. The said medium stick is made from metal material. SiO2 is inserted between medium sticks. The structure of polarimeter is different from the traditional polarimeter. Changing the ratio of R/a between the radius of the metal stick and the lattice constant can design the working wave band in advance and obtain high degree of polarization and transmission rate.

The invention belongs to the technical field of microelectronics and optoelectronics and relates to an efficient GaN-based LED coupled to a plasmon and a manufacturing method thereof. The efficient GaN-based LED comprises a sapphire substrate, a GaN nucleating layer, a GaN undoped layer, an n-type GaN layer, InGaN/GaN multiple quantum wells, a p-type GaN ohmic contact layer, an Ag photonic crystal layer and a p-type GaN doped layer. Gaps of Ag photonic crystal are filled with p-type GaN. One electrode P and one electrode N are provided. The efficient GaN-based LED is manufactured by a MOCVD (metal organic chemical vapor deposition) technology and a micro-nano machining technology, and luminous efficiency of a device is enhanced by local coupling of SPP (surface plasmon polartions) leak mode and near field of the metal photonic crystal.

The invention relates to a method for preparing metal photonic crystals through electrodeposition. A photonic crystal front template with good sequentiality is deposited on a FTO base through a gravity settling self-assembly method; the front template serves as a cathode, metal positive ions are reduced in an electrolyte, and gaps of the photonic crystal front template are filled with the metal positive ions; and the photonic crystal front template is removed through an organic solvent, and the metal photonic crystals of an inverse opal structure are prepared. By changing the particle sizes ofthe front template, the metal photonic crystals with the hole diameters being 100 nm-1 [mu]m are prepared. By adjusting the cathode-current density and the deposition time, thickness-controllable preparation of the metal photonic crystals is achieved.

The invention discloses a two-dimensional metallic photonic crystal-based colored filter, which belongs to the technical field of liquid crystal display. The two-dimensional metallic photonic crystal-based colored filter comprises a substrate and a plurality of two-dimensional transmission type metallic photonic units, wherein the two-dimensional transmission type metallic photonic units are positioned on the substrate; the two-dimensional transmission type metallic photonic units correspond to each pixel of a liquid crystal display; and each two-dimensional transmission type metallic photonic unit comprises an isolation matrix and three two-dimensional transmission type metallic photonic crystals having different cycles, wherein the two-dimensional metallic photonic crystals are positioned in the isolation matrix to filter the spectrums of red, green and blue correspondingly. The two-dimensional metallic photonic crystal-based colored filter can make light with specific wavelengths emit out at the same time, and make emergent light in linear polarization to improve light brightness; when the two-dimensional metallic photonic crystal-based colored filter is placed on a liquid crystal layer, the brightness can be increased by two times maximumly; when the two-dimensional metallic photonic crystal-based colored filter is placed on the light guide plate, the brightness can be increased by 5 times maximumly; and simultaneously, the integration level of a panel device can be improved, and the thickness and the cost of a panel can be reduced greatly.

The invention discloses an efficient light-emitting diode containing a metal photonic crystal. The efficient light-emitting diode containing the metal photonic crystal is characterized by being composed of a substrate (1), a n-type layer (2), a multi-quantum well (3), a p-type layer (4) and the metal photonic crystal (5), wherein the metal photonic crystal (5) is located above the p-type layer (4). According to the efficient light-emitting diode containing the metal photonic crystal disclosed by the invention, the divergence angle of the outgoing beam of the LED (light-emitting diode) is reduced by virtue of the surface plasmon resonance effect and the energy aggregation effect of the metal photonic crystal, and the photonic band gap light-guiding characteristic of the metal photonic crystal, so that the light-emitting efficiency of the LED can be greatly increased.

The invention relates to a preparation method of a metal photonic crystal material, belonging to the preparation field of inorganic nano materials. The method comprises the steps of: preparing a silicon dioxide reverse template material by taking colloid microspheres as a template material; preparing silicon dioxide inverse opal structure by a co-assembly method; then carrying out reduction reaction by using steam of dimethylaminoborane, wherein an alcohol solution of chloroauric acid and chloroplatinic acid are taken as a gold source and a platinum source; and finally synthesizing the metal photonic crystal material. The technical scheme in the invention is novel and reasonable in design, wide in application scope, simple in operation, easy to control in reaction, good in repeatability, free from pollution and good in safety. The prepared metal photonic crystal material is even in order within hundreds of microns, and is good in optical property.