48 results about "Magnetic photonic crystal" patented technology

The invention discloses a preparation method of magnetic microspheres with a visible glucose detection function. The preparation method comprises the following steps: by utilizing a photonic crystal microsphere as a template, preparing magnetic photonic crystal hydrogel microspheres with reverse opal structures through a template copy method of hydrogel. A detection method comprises the steps that: a glucose molecule identification unit is combined with the magnetic photonic crystal hydrogel microspheres, wherein the existence or number of the glucose molecules is expressed by the displacement or color of the reflection peak of the photonic crystal microsphere; a magnet is used for collecting the magnetic microspheres according to the property that the magnetic microspheres have magnetism to improve the naked eye observation accuracy of the color of the magnetic microspheres. The visible glucose detection method based on magnetic microspheres with visible glucose detection function has the advantages of high sensitivity, strong specificity, simple operation, low cost, accurate observation, and the like.

The invention discloses monodisperse superparamagnetic nano crystal colloidal core-shell composite particles, which are monodisperse superparamagnetic nano cluster particles which are gathered by ferroferric oxide nanocrystalline. The surfaces of the particles are coated by polyvinylpyrrolidone. The preparation method of the composite particles comprises the following steps: adding trivalent iron salt to polyol mixture solution of polyvinylpyrrolidone and polyhydroxy compounds; agitating until the trivalent iron salt is completely dissolved; adjusting the pH value to 8.0-10.0, then carrying out enclosed heating to 180-240 DEG C, and carrying out heat preservation for 6-48 hours. The monodisperse superparamagnetic nano crystal colloidal core-shell composite particles disclosed by the invention can be assembled into different colors of photonic crystal in a magnetic control manner; the dependency level of the magnetic photonic crystal on the solvent polarity, the ion strength and the pH value can be reduced.

The invention relates to a magnetic hollow microsphere of spinel ferrite and a preparation method thereof and pertains to the technical field of magnetic materials with intercalation structure. The general chemical formula of the magnetic hollow microsphere of spinel ferrite is M<2+>Fe<3+>2O4. The method comprises the following steps: firstly, on the surface of sulfonated polystyrene microspheres, metal-salt ions with different charges are absorbed; then, by adopting coprecipitation, hydrotalcite generates in situ on the surface of the sulfonated polystyrene microspheres; and then, by means of a program of increasing temperature and roasting, the magnetic hollow microspheres of spinel ferrite can be obtained. The process can adjust and control the generation of the hydrotalcite on the surface of the sulfonated polystyrene microspheres by regulating synthetic conditions and crystallization temperature, and regulate magnetic property of the spinel ferrite by adjusting and regulating the composition of LDHs laminates. The magnetic hollow microsphere of spinel ferrite of the invention has special technique conditions, simple operation and mild synthetic conditions, and owing to the unique structure and properties, the hollow microsphere can be widely applied in such respects as drug carriers, nanoreactors, filtration, separation, magnetic filling materials and magnetic photon crystals, etc.

The invention discloses an optical clock extractor, which belongs to the technical field of optical communication and solves the problems that in the prior art, the optical clock extractor is complex and the extractable clock range thereof is limited. The optical clock extractor comprises a one-dimensional magnetic photonic crystal optical fiber coupler module and an adjustable off-set magnetic field unit for providing an applied magnetic field for the one-dimensional magnetic photonic crystal optical fiber coupler module, wherein the one-dimensional magnetic photonic crystal optical fiber coupler module comprises a collimating lens, a polarizer, a one-dimensional magnetic photonic crystal and a self-focusing lens. The invention also provides a method for performing optical clock extraction by using the extractor, which can achieve the adjustment of the spacing between transmission harmonic peaks to finally realize the optical clock extraction and process optical clock signals into the required forms. The optical clock extractor and the method not only achieve the optical clock extraction, but also can inhibit the jitter of the optical clock signals in the transmission process, and have the characteristics of simple realization, low cost, convenient operation, and automatic recognition of optical signal clocks.

The invention discloses a four-channel terahertz wave signal selection switch based on magnetic photonic crystal. An input waveguide is formed by horizontally removing part of dielectric cylinders inthe middle of a complete photonic crystal with TE mode band gap, and four output waveguides are formed by removing part of dielectric cylinders in the longitudinal direction of photonic crystals and symmetrically in the upper and lower ends of the input waveguide. An odd number of dielectric cylinders are retained between the four output waveguides and the input waveguide respectively. The centraldielectric cylinder of the retained odd number of dielectric cylinder is replaced with a magnetic point defect dielectric cylinder, and the magnetic point defect dielectric cylinder form a magnetic point defect micro-cavity with the surrounding medium cylinders. The input waveguide inputs a terahertz wave and controls the magnitude of the applied magnetic field applied to the selection switch. When the resonant frequency of a magnetic point defect micro-cavity is the same as the frequency of the incident terahertz wave, the incident wave can be coupled to the corresponding output waveguide for output. The switch has the advantages of fast speed, small volume and easy integration. And with four channels, the incident wave can be output from any one of the output channels.

Provided is a one-dimensional magnetic photonic crystal for achieving broadband optical isolation. The structural formula of the basic component S0 of the one-dimensional magnetic photonic crystal is [H/L] 2/M/ [L/H] 5/M/ [H/L] 2/M/ [L/H] /2/M/ [H/L] 5/M/ [L/H] 2, wherein H is silicon, L is silicon oxide, and M is cerium mixed yttrium iron garnet. A first composite structure S1 of the one-dimensional magnetic photonic crystal meets the following equation: S1=S0/M/S0, and a second composite structure S2 of the one-dimensional magnetic photonic crystal meets the following equation: S2=S0/M/S0/M/S0. According to the one-dimensional magnetic photonic crystal, the composite structures reduce the total layer number of film layers, reduce preparation difficulty and improve work stability of an optical isolator.

The invention discloses a pattern-reconfigurable directional radiation antenna. The pattern-reconfigurable directional radiation antenna comprises at least two sets of magnetic photonic crystal arrays composed of magnetic columns, a radiation feed source, and metal boards covering upper and lower surfaces of the magnetic columns, wherein the magnetic columns are arranged in the air environment and are externally disposed in an axial bias magnetic field, the radiation feed source is arranged at a boundary portion of the photonic crystal arrays, and the different arrays have different structure parameters and different magnetic column materials. As the external magnetic field changes, energy band structures of magnetic photonic crystals having different structure dimensions and material components change, and change speeds of band bottom frequencies are different. According to the antenna, the radiation direction is dynamically changed through changing the external magnetic field, and the antenna further has advantages of good directional performance, simple structure, easy realization and low cost.

The invention relates to a method for preparing a magnetic photonic crystal on the basis of biological templates of single scales of a butterfly wing. The method comprises the steps of: carrying surface pretreatment on a whole butterfly biological template; preparing a precursor metal-sol gel solution; placing the treated biological template in the prepared precursor solution for soaking treatment; after the soaking, taking out a sample, flushing by distilled water and drying; under the help of a microscope, selecting soaked single scales and drying by using a drying oven; roasting to remove the biological templates of the single scales to obtain a single butterfly scale ferric oxide material keeping a photonic crystal structure; and further sintering and reducing under hydrogen-argon mixed gas to obtain a single butterfly scale magnetic ferroferric oxide material keeping the photonic crystal structure. The prepared single butterfly scale magnetic material with the natural photonic crystal structure has good response to magnetism and light, can be controlled within a scale range from nanometer to micrometer and has a potential application prospect in the field of magneto-optical communication devices.

The invention discloses a microwave band-pass filter which comprises a substrate with through holes and a magnetic photonic crystal which is composed of a plurality of permanent magnetic ferrite columns. The permanent magnetic ferrite columns are arranged in the through holes. The microwave band-pass filter has the filter characteristics of being wide in frequency band, high in out-of-band rejection, and smooth in band, and meanwhile has the advantages of being small in size, simple in structure, easy to process, low in cost, easy to achieve, and the like.

The invention relates to a one-dimensional magnetic photonic crystal for implementing optical isolation, of which the structural formula is [H/L]3/M/[L/H]7/M/[H/L]7/M/[L/H]3, wherein H is a gallium arsenide film with the thickness of 114.85nm, L is a silicon dioxide film with the thickness of 259.2nm, and M is a cerium-doped yttrium iron garnet film with the thickness of 158.68nm. The crystal in such a structure can implement optical isolation within the small range near the central operating wavelength 1550nm, and only comprises 43 optical film layers, thereby lowering the actual preparation difficulty.

The invention discloses a frequency-adjustable directed-radiation antenna which comprises a substrate with multiple through holes, a magnetic photonic crystal and a line source. The magnetic photonic crystal is composed of multiple soft magnetic ferrite columns and is of a periodic array structure, each soft magnetic ferrite column is disposed in the corresponding through hole, a bias magnetic field is externally added along the axial direction of the soft magnetic ferrite columns, the line source is positioned in the middle of the photonic crystal, a metal cover plate is arranged on each of the upper surface and the lower surface of the substrate, an aluminum foil covers one side, opposite to the radiation direction, of the photonic crystal, and two ends of the soft magnetic ferrite columns are close to the metal cover plates. The frequency-adjustable directed-radiation antenna has the characteristics of wide frequency band, good directed radiation performance and the like and has the advantages of simple structure, easiness in processing and realizing, low cost and the like.

The invention discloses an ultra-trace multi-biological macromolecule detecting method based on a mixed hydrogel magnetic photonic crystal barcode. The mixed hydrogel magnetic photonic crystal barcodeis obtained by utilizing a protein structure assembled by a monodisperse microsphere prepared by a microfluidic device as a template, then pouring mixed magnetic nanoparticle hydrogel into a templateand removing the template. Then a probe is coupled on the surface of the mixed hydrogel photonic crystal barcode and then integrated into the super-hydrophobic surface, the difference in wettabilityis utilized to achieve natural concentration and enrichment of a sample to achieve the purpose of ultra-trace biological macromolecule detection. Based on the stable optical characteristics such as the characteristic reflection peak of the photonic crystal, detection of a plurality of biological macromolecules, that is, multivariate detection can be achieved simultaneously. In summary, the concentrated enrichment method has the advantages of simple operation, low cost, high sensitivity and high versatility, and the method can be applied to the detection of clinical ultra-sensitive multi-microbial macromolecules.

A magnetic photonic crystal for providing asymmetry of spatial frequencies in the propagation of light is provided. The crystal is formed from at least two materials having different indices of refraction which are aligned along the longitudinal axis of the crystal. And arranged in an array whose symmetry does not include a spatial inversion operator such that (x,y)==/=(−x,−y). One or more of the materials forming the array is magnetic such that the magnetic group representation of the array does not include time inversion as a symmetric operator. In operation, when the magnetic material forming the material is magnetized, the group velocity property of light propagated in one direction along the axis of the array is different from the group velocity property of light transmitted in an opposite direction through the array. The magnetic photonic crystal may be used, for example, as an optical memory device or a high speed modulator/demodulator.

The invention discloses a method for preparing a magnetic response photonic crystal gel through front-end polymerization. The preparation method comprises the following steps: dissolving magnetic ferroferric oxide nanoparticles, a vinyl monomer, beta-cyclodextrin, an initiator and a cross-linking agent into an organic solvent; preparing a uniform solution, transferring the uniform solution into atest tube, vertically or parallelly fixing a magnet at the bottom or the periphery of the test tube, heating the liquid level of the uniform solution in the test tube through an electric soldering iron, initiating polymerization reaction, and finally obtaining the photonic crystal gel through fixing magnetic photonic crystal structures in a gel network after front-end polymerization is finished. In the polymerization reaction process, no external heat source is needed for maintaining polymerization of the whole system, controllability is achieved, the polymerization reaction time is short, energy is saved, and pollution is avoided; through combination of magnet control and thermal polymerization, one-step rapid preparation of the photonic crystal gel is realized, a method is provided for rapid preparation of the magnetic photonic crystal, and the method has a very high application value in industrial production.

The invention discloses a non-reciprocity dual-channel narrow-band filter of a non-magnetic photonic crystal. The non-reciprocity dual-channel narrow-band filter comprises a vertical input main waveguide, two horizontal output waveguides and a microcavity formed by rectangular dielectric cylinders. According to the design structure, the spatial structure symmetry of the non-magnetic photonic crystal is destroyed, and non-reciprocity transmission is achieved through odd-even mode matching of the waveguide and the microcavity. And under the condition of positive input, the resonant cavity is coupled with different horizontal output waveguides in different directions, so that dual-channel narrow-band filtering output is realized. Under the condition of reverse input, electromagnetic waves with the same frequency in the same symmetric mode cannot be coupled and output due to the fact that the symmetric mode of the electromagnetic waves is not matched with the waveguide. The two-dimensional photonic crystal non-reciprocity filter is high in transmittance, high in isolation degree and small in size, has the advantages of being simple in structure, low in power consumption, easy to integrate and the like, and has potential application value in a future integrated optical loop.

The invention relates to the technical field of photonic crystal and in particular relates to self-guided unidirectional edge state transmission of a magnetic photonic crystal tablet. The self-guidedunidirectional edge state transmission comprises magnetic columns, a wave absorbing material, homogeneous medium materials, an excitation probe and a receiving probe. A certain number of magnetic columns are arranged to form a honeycomb structure. Gaps among the magnetic columns are filled with air. The wave absorbing material surrounds the magnetic column honeycomb structure. The excitation probeand the receiving probe are disposed between the magnetic columns and are located at the boundary of the magnetic column honeycomb structure. The incident end face of the excitation probe is perpendicular to a connection line of the excitation probe and the receiving probe. The two above parts are fixed between two homogeneous medium materials. The above technical solution achieves completely self-guided unidirectional edge transmission by using the magnetic photonic crystal tablet.

The invention provides anti-counterfeiting ink and a preparation method thereof, and an anti-counterfeiting pattern layer and a preparation method thereof. The anti-counterfeiting ink comprises magnetic photonic crystals and a curable composition, the magnetic photonic crystals are uniformly dispersed in the curable composition, and the anti-counterfeiting ink is prepared by the following method: dispersing the magnetic photonic crystals in a liquid of the curable composition to obtain a mixed liquid; and stirring the mixed solution to obtain the anti-counterfeiting ink. The magnetic photonic crystals are uniformly dispersed in the curable composition, so that the anti-counterfeiting ink shows color change and light rolling and dynamic effects in a magnetic field through the magnetic photonic crystals, and the anti-counterfeiting effect is enhanced.

The invention discloses a magnetic photonic crystal microsphere for enriching and separating aflatoxin B1 as well as a preparation method and application of the magnetic photonic crystal microsphere. The microsphere is a core-shell type surface molecular imprinting magnetic inverse opal photonic crystal microsphere, wherein the core is a photonic crystal microsphere which is of a magnetic inverse opal structure and is formed by silicon dioxide nanoparticles, polystyrene nanoparticles and ferroferric oxide magnetic nanoparticles through self-assembly and high-temperature firing, and the shell is a molecular imprinting layer which is modified through a molecular imprinting technology and can specifically recognize aflatoxin B1. The prepared core-shell type surface molecular imprinting magnetic inverse opal photonic crystal microsphere can selectively extract aflatoxin B1 in a sample, and compared with a biological antibody modified material, the stability of the material can be greatly improved, and the preparation cost of the material is reduced.

The invention relates to the field of display materials, in particular to a responsive photonic crystal film with a wide temperature induction interval and a preparation method of the responsive photonic crystal film. Theresponsive photonic crystal film comprises a substrate and a temperature-sensitive responsive photonic crystal gel film bound on the substrate, and the temperature-sensitive responsive photonic crystal gel film is composed of a temperature-sensitive responsive gel matrix and a magnetic photonic crystal elastic nano chain fixed in the temperature-sensitive responsive gel matrix. The color of the photonic crystal film changes in two color systems along with the temperature change. In the temperature induction interval, the color is basically unchanged; and after the intervalis induced, the photonic band gap is subjected to blue shift along with temperature rise, and the color of the photonic band gap is changed to another color system until volume phase change occurs and the color disappears. According to the preparation method disclosed by the invention, the magnetic photon nano elastic chain is dispersed in the temperature-sensitive responsive gel prepolymer solution and coats the surface of the substrate, and the gel film bound by the substrate is obtained by combining a magnetic orientation technology and a curing reaction, so that the preparation period isshort, and the method is simple and easy to operate.

The invention relates to the field of photonic crystal materials, in particular to a preparation method of monodisperse core-shell particles capable of being magnetically assembled into high-color saturation photonic crystals in oleoresin. The method comprises the following steps: (1) uniformly mixing magnetic particles with an oily polymerizable shell raw material, an initiator and a dispersion medium solvent to obtain a pre-polymerized solution; and (2) initiating polymerization of the pre-polymerization liquid in at least one mode of stirring light curing, stirring heat curing or magnetic heat, so that the polymer coats the surfaces of the magnetic particles. Compared with existing similar products, the monodisperse core-shell particles capable of achieving magneto-discoloration in the oleoresin are prepared through stirring photocuring or stirring thermocuring or a magnetocaloric method, the problem that the peak width of a magnetic photonic crystal material in the oleoresin is too large is solved, the monodisperse core-shell particles can serve as filler to be dispersed in the oleoresin, structural colors with high color saturation are diffracted under the action of different external magnetic fields, and the narrowest half-peak width of a diffraction spectrum can be below 30nm.