22 results about "Two-photon absorption" patented technology

The application belongs to the technical field of semiconductor power devices, and particularly discloses a method for laser stripping gallium oxide. The method is characterized in that a super-short pulse laser with a predetermined wavelength is irradiated into the gallium oxide, and a two-photon absorption process occurs when the laser is focused at a position with a specific thickness from the surface. The high temperature generated in the process causes thermal decomposition of the gallium oxide, thereby achieving the purpose of stripping the gallium oxide. Compared with the traditional substrate cutting technology, the stripping method can significantly reduce the cutting consumption of the gallium oxide substrate, and the cut substrate can be reused after polishing, which helps to reduce the manufacturing cost of the gallium oxide device.

The application discloses a self-correlation instrument based on gallium oxide two-photon absorption ultraviolet femtosecond laser pulse width measurement, and belongs to the technical field of photoelectric regulation and control. The self-correlation instrument comprises a laser generating device, an optical delay system and a self-correlation signal acquisition device. The laser generating device is used for generating a first light beam and a second light beam. The optical delay system is connected with the laser generating device and is used for changing the time when the first light beam and the second light beam reach a sample to be measured. The self-correlation signal acquisition device is used for receiving two-photon photoelectric conversion signal change data caused by the sample to be measured being irradiated by the first light beam and the second light beam in sequence, and obtaining a self-correlation signal based on the two-photon photoelectric conversion signal change data. The application makes full use of the ultraviolet wave band absorption characteristics of gallium oxide to prepare an ultraviolet detector, and uses the self-correlation method to measure the photoelectric conversion signal generated by two-photon absorption of the gallium oxide ultraviolet detector to measure the pulse width of the 350-450 nm near-ultraviolet wave band femtosecond laser.

The present invention is directed to a method for printing a micro-scaled or nano-scaled XUV and / or X-ray Diffractive optic (1), including the following steps: a) providing a material (2) with a first component (2a) being photo-sensitive and being polymerizable by two-photon-absorption, b) providing data (3) of a desired geometrical structure (4) of the optic (1) and creating at least one trajectory (8) corresponding to the data (3) of the desired structure (4) of the optic (1), c) providing a high-intensity energy beam (5), in particular a laser beam, wherein the beam (5) comprises a focus (F) having a position being adjustable to a plurality of positions (F1, F2, <, Fp) being coincident with the at least one trajectory (8), d) polymerization of the material (2) by two-photon-absorption at a first position (Fn) of the focus (F), thereby creating a first voxel (vn1n2n3) of the structure (4) of the optic (1), adjusting the position of the focus (F) from the first position (Fn) to a subsequent position (Fn+1) of the focus (F) along the at least one trajectory (8) and repeating step d) at the subsequent position (Fn+1) of the focus (F), wherein a distance (d) between each of the positions (F1, F2, <, Fp) of the focus (F) and at least one of the rest of the positions (F1, F2, <, Fp) of the focus (F) is smaller than a mean diameter (vd) of the voxels produced at these positions with respect to their dimension parallel to the distance (d).

The invention belongs to the technical field of mid-infrared imaging, and discloses a mid-infrared two-photon calculation imaging system and method based on pumping space coding, and the method comprises the steps: carrying out the spatial intensity coding of near-infrared pumping light through employing a spatial light modulator; the intensity code of the pump light is mapped into the non-degenerate light by means of the nonlinear effect of the single-pixel detector, the detector outputs the integral intensity value of the non-degenerate signal related to the spatial intensity code, and the two-dimensional information of the object to be detected is reconstructed by combining the correlation algorithm. By means of the non-degenerate two-photon absorption effect of a single-pixel detector material, structural detection of a mid-infrared light field is achieved. Compared with direct modulation in a mid-infrared light field, the method has the advantages that the influence caused by a long-wave diffraction effect is effectively avoided, high-precision coding modulation is realized, and the physical pixel limitation of a traditional mid-infrared detector is effectively broken through. The invention has the technical advantages of high imaging sensitivity, fast time response, high modulation precision, large imaging field of view, wide response band and the like.

The invention relates to the technical field of research and development of tumor photodynamic therapy photosensitizers, photothermal therapy photothermal reagents and sonodynamic therapy sonosensitizers, and provides a preparation method and application of a binuclear metal complex of a polythiophene bridging ligand. The invention relates to a ruthenium complex TBLRu3a-TBLRu6a and a ruthenium complex TBLRu3b-TBLRu6b of a polythiophene bridged tri-bidentate ligand, a ruthenium complex TTLRu1-TTLRu12 of a polythiophene bridged bis-tridentate ligand, and an osmium complex TTLOs1-TTLOs6 of a polythiophene bridged bis-tridentate ligand, which are respectively designed and invented by the invention. The invention further relates to a preparation method of the ruthenium complex TBLRu3a-TBLRu6a and the ruthenium complex TBLRu3b-TBLRu6b of the polythiophene bridged tri-bidentate ligand and a preparation method of the ruthenium complex TTLRu1-TTLRu12 of the polythiophene bridged bis-tridentate ligand. The polythiophene bridged metal complex has extremely high stability and excellent two-photon absorption characteristic, has excellent biotoxicity and photothermal conversion capability under the action of infrared exciting light, and can induce A549R cell apoptosis. The polythiophene bridged metal complex provided by the invention is a potential novel two-photon absorption photodynamic therapy photosensitizer, a photothermal therapy photothermal reagent and a sonodynamic therapy sonosensitizer, and has a wide application prospect in photodynamic therapy, photothermal therapy and sonodynamic therapy of tumors.

A method of altering a refractive property of a crosslinked acrylic polymer material by irradiating the material with a high energy pulsed laser beam to change its refractive index. The method is used to alter the refractive property, and hence the optical power, of an implantable intraocular lens after implantation in the patient's eye. In some examples, the wavelength of the laser beam is in the far red and near IR range and the light is absorbed by the crosslinked acrylic polymer via two-photon absorption at high laser pulse energy. The method also includes designing laser beam scan patterns that compensate for effects of multiphone absorption such as a shift in the depth of the laser pulse absorption location, and compensate for effects caused by high laser pulse energy such as thermal lensing. The method can be used to form a Fresnel lens in the optical zone.

The application provides a silicon super-structure surface unit based on Fano resonance and a super-structure surface. The silicon super-structure surface unit based on Fano resonance comprises a unit base and two base protruding ribs. The base protruding ribs are arranged on the side surface of the unit base, and the base protruding ribs extend from the upper surface to the lower surface of the unit base. First base defects are arranged between the two base protruding ribs, and second base defects are arranged on both sides of the two base protruding ribs. The silicon super-structure surface based on Fano resonance comprises a plurality of silicon super-structure surface units based on Fano resonance arranged in an array. Each silicon super-structure surface unit based on Fano resonance is provided with three base defects. The symmetry of the silicon cubic structure is broken by the defects, the weak coupling between the bright and dark modes is induced, the sharp Fano resonance is generated, the large local near-field enhancement is realized, and the two-photon absorption response is greatly enhanced.

The application provides a coumarin and carbazole dipyridine salt type water-soluble two-photon initiator, a preparation method and application thereof, and in particular, a use in the field of laser micro-nano processing technology. In the structural general formula of the two-photon initiator, R1 is selected from hydrogen, C 1‑12 alkyl, C 1‑12 hydroxyalkyl or an ethereal unit with a number of repetitions of 1-12; R2 is selected from methyl, ethyl or isopropyl; and Y is a corresponding anion. The two-photon initiator has a large conjugated structure, and the introduction of the dipyridine salt enables the two-photon initiator to be soluble in water. As an initiator, the two-photon initiator can initiate two-photon photopolymerization in an aqueous phase, and the two-photon absorption cross section is greater than 100 GM, so that the power threshold of two-photon photoinitiation during processing is low, i.e. 25 mW. Therefore, the high initiation activity and low two-photon polymerization threshold of the two-photon initiator enable the two-photon initiator to efficiently initiate two-photon polymerization in an aqueous phase, and the effect of processing three-dimensional hydrogels by using two-photon polymerization is outstanding.

The invention relates to the technical field of photoelectric detection, in particular to a photoelectric detector and system based on ferroelectric perovskite non-degenerate two-photon absorption. The photoelectric detector comprises a substrate layer; the metal electrode layer is positioned on the substrate layer; the light absorption layer is located on the substrate layer and is composed of a ferroelectric perovskite thin film; the protective layer is formed by a boron nitride film; the metal electrode layers are located on the two sides of the light absorption layer. The photoelectric detector can perform photoelectric detection by using a ferroelectric perovskite non-degenerate two-photon absorption effect, a detection threshold value is reduced by one order of magnitude, and measurable light current can be generated for weak light without high-peak light power; a built-in electric field generated by spontaneous polarization of the ferroelectric perovskite can effectively separate electron-hole pairs, so that the signal-to-noise ratio and the response speed are greatly improved; and the structure is simple, the cost is low, and high-sensitivity and stable detection on weak light can be realized.

The invention belongs to the technical field of fluorescent probes, and particularly discloses an N-CDs fluorescent probe as well as a preparation method and application thereof, and the fluorescent probe is prepared from p-phenylenediamine and L-tartaric acid by adopting a one-step hydrothermal method. The invention relates to a carbon quantum dot probe which has a two-photon absorption characteristic and can specifically target a cell nucleus and a lipid droplet organelle in a living cell at the same time so as to realize double-color and double-target fluorescence imaging. The probe has important application value in the aspects of long-time dynamic observation of living cells, multi-organelle interaction research and deep tissue imaging.

The invention relates to triaryl boron modified aza [7] helicene derivatives with two-photon absorption and two-state circular polarization luminescence characteristics. The invention belongs to the technical field of organic photoelectric functional materials, and provides an aza [7] helicene derivative with dual-state circular polarization luminescence and two-photon absorption properties. The fluorescent quantum efficiency of pure carbon [7] helicene is remarkably improved, and the double-state CPL and strong TPA characteristics are realized in a single organic molecule.

The invention discloses a crystalline organic light-emitting material and a preparation method and application thereof. The crystalline organic light-emitting material comprises a cyclotrimeric naphthalene diimide derivative and perylene, and the cyclotrimeric naphthalene diimide derivative and perylene molecules are connected through a non-covalent pi. The crystalline organic light-emitting material is formed by stacking molecules of the cyclotrimeric naphthalene diimide derivative under the action of C-H... Pi and C-H... O. The invention further discloses a preparation method of the crystalline organic light-emitting material. Compared with the characteristic of single fluorescence excitation mode in the existing material, the organic eutectic luminescent material provided by the invention realizes an efficient two-photon absorption cross section and also realizes efficient photothermal conversion performance.

The present application relates to the development of a photosensitizer for photodynamic therapy of tumors, a sonosensitizer for sonodynamic therapy, and a photothermal reagent for photothermal therapy, and provides a bithiophene-benzene bridged ligand and a preparation method thereof, and a bithiophene-benzene bridged dinuclear metal complex and a preparation method and application thereof. The present application is based on a bithiophene-benzene bridged ligand dtdpip, and a bithiophene-benzene bridged dinuclear ruthenium complex, a bithiophene-benzene bridged dinuclear osmium complex and a bithiophene-benzene bridged dinuclear iridium complex are respectively designed and invented. The bithiophene-benzene bridged dinuclear metal complex has extremely high stability and excellent two-photon absorption characteristics, and has excellent biological toxicity and photothermal conversion capacity under the action of infrared excitation light and ultrasonic waves. The conjugated bithiophene dinuclear metal complex provided by the present application is a potential new type of infrared photodynamic photosensitizer, sonosensitizer and photothermal reagent, and has a broad application prospect in the photodynamic therapy, sonodynamic therapy and photothermal therapy of tumors.

This invention discloses the application of a 4-methylenemalonium-benzopyran derivative fluorescent dye in biofluorescence imaging. The 4-methylenemalonium-benzopyran derivative fluorescent dye, as shown in formula (I), is obtained by a Knoevenagel condensation reaction of 9-aldehyde julonidine with 2-(2-methyl-4H-benzopyran-4-methylene)malonium under piperidine catalysis. The preparation method of this compound is simple, the reaction conditions are mild, and the yield is high. The 4-methylenemalonium-benzopyran derivative fluorescent dye exhibits excellent two-photon absorption properties and can be applied to confocal fluorescence imaging of HeLa cells and two-photon excitation microscopy of HEK cells. Furthermore, this compound has good biocompatibility and can achieve mitochondrial localization, showing great promise for applications in molecular biology and medicine.

This invention proposes a method to expand the light absorption range of photocatalytic materials and improve their photocatalytic hydrogen production performance by doping rare earth ions Yb into WO3 rich in oxygen vacancies. 3+ Er 3+ Achieving upconversion luminescence with WO3:Yb 3+ Er 3+ Zn as a sensitizer and photocatalytic semiconductor x Cd 1‑x S, Zn, In2S4, and other compounds form a core-shell structure composite material. Based on the two-photon absorption of WO3 and the upconversion luminescence of rare earth ions, the composite material achieves the simultaneous transfer of high-energy electrons and photons from the sensitizer to the photocatalyst, realizing the goal of photocatalytic reduction of water to produce hydrogen through photo-photo and photo-electro-synergistic sensitization. Through the synergistic effect of the two-photon absorption of WO3 rich in oxygen vacancies and the upconversion luminescence of rare earth ions, and by employing a mild method to combine it with the photocatalytic semiconductor without altering its structure, the composite material can produce hydrogen under ultraviolet-visible-near-infrared light irradiation, significantly improving its solar photocatalytic hydrogen production performance.

The invention belongs to the technical field of organic photoelectric functional materials, and provides a B <-N heterocyclic ring fused [6] helicene derivative with circular polarization luminescence and two-photon absorption properties. The fluorescent quantum efficiency of parent [6] helicene is remarkably improved, and a single organic molecule has high CPL brightness and a large TPA cross section at the same time.

The application belongs to the technical field of organic synthesis, and relates to a kind of single two-photon double-mode excitation high-sensitivity detection cell and tissue endogenous H2S molecular probe. The application relies on the skeleton of the fluorine cyanin as near-infrared dye, introduces naphthalene derivative with two-photon absorption characteristics, and aromatic nitroso structure, and synthesizes two two-photon near-infrared fluorescent molecular probes. The molecular probe provided by the application has the ability to combine with H2S, can specifically recognize H2S under physiological and pathological environment, realizes single-molecule double-mode excitation and separate two-pathway fluorescence imaging visualization monitoring of endogenous H2S fluctuation level in organism.

This invention provides a device and spectrometer for the quantitative detection of carbon dioxide isotopes using a two-photon absorption method. This device is based on two-photon absorption technology. A laser frequency locking module locks the laser onto a high-precision optical cavity, ensuring the laser frequency matches the cavity's mode frequency. A piezoelectric ceramic unit adjusts the cavity length, thereby tuning the cavity's mode frequency to match the laser frequency with the energy level of the target molecular isotope, resulting in selective excitation. A signal detection module measures the transmitted light intensity of the high-precision optical cavity to obtain the two-photon absorption signal. A signal processing module analyzes and processes this signal to determine the concentration of the target molecular isotope. Because two-photon absorption has a Doppler-free property, the spectral linewidth is narrowed, effectively improving spectral resolution and isotope selectivity, thus achieving highly sensitive quantitative detection of carbon dioxide isotopes.

The invention belongs to the technical field of pulse laser single event effect testing, and discloses a quantitative estimation method and system for pulse laser single event effect equivalent LET, and the method considers two optical absorption processes of single photon absorption (SPA) and two-photon absorption (TPA). The influence of light beam characteristics, device parameters and material characteristics on light beams in the photon absorption process is analyzed, calculation formulas and parameter definitions are defined, and the LETL under any pulse laser test condition can be accurately estimated. The invention further provides experimental verification steps of the LETL, so that the reliability of a calculation result is ensured. The method provides key technical support for pulse laser testing as a predictive alternative method for heavy ion testing, and has wide application prospects.

The invention relates to the technical field of research and development of tumor photodynamic therapy photosensitizers, photothermal therapy photothermal reagents and sonodynamic therapy sonosensitizers, and provides two bithiazole bridging ligands and preparation methods thereof as well as binuclear metal complexes of the bithiazole bridging ligands as well as preparation methods and application of the binuclear metal complexes. According to the invention, a binuclear ruthenium complex, a binuclear osmium complex and a binuclear iridium complex are respectively designed and invented on the basis of bithiazole bridging ligands bpytztz and piptzpip. The two types of bithiazole bridged binuclear metal complexes have extremely high stability and excellent two-photon absorption characteristics, have excellent tumor cytotoxicity and photothermal conversion capacity under the action of infrared exciting light, can induce cell apoptosis and effectively inhibit growth of tumors in mice. The bithiazole bridged binuclear metal complex provided by the invention is a potential novel infrared photodynamic photosensitizer, a photothermal reagent and a sonodynamic therapy sonosensitizer, and has a wide application prospect in photodynamic therapy, photothermal therapy and sonodynamic therapy of tumors.

The invention discloses three two-photon fluorescent metal organic frameworks (MOFs) materials as well as a preparation method and application thereof, and belongs to the technical field of functional materials. The material is formed by self-assembly through a solvothermal method by taking a bis-triarylated amine derivative tetra (1, 1 '-biphenyl-4-carboxylic acid)-1, 4-phenylenediamine (HTPBD) as an organic ligand and alkaline earth metal ions (Mg, Ca and Sr) as inorganic nodes, and has a definite crystal structure, excellent two-photon fluorescence performance and good thermal stability. According to the invention, the framework topological structure, the chromophore accumulation mode and the pi-pi interaction intensity are accurately regulated and controlled by regulating and controlling the radius of the metal ions, so that the material shows an adjustable two-photon absorption cross section and fluorescence quantum yield, and the two-photon performance of the Ca-based MOFs material is optimal. The material can be widely applied to the fields of information storage, anti-counterfeiting, nonlinear optical devices and the like, solves the technical problems that an existing two-photon fluorescent material is high in cost, difficult in performance regulation and control and the like, and has important practical application value.

The application discloses a high-precision laser ranging method based on two-photon time-gated balanced detection, and belongs to the technical field of laser ranging. A pulse laser source is used to split into a reference pulse and a measurement pulse. After being reflected by a target, the measurement pulse is superimposed with the reference pulse in a beam combining path and irradiated to a photosensitive surface of a two-channel balanced detector. Only when the reference pulse and the measurement pulse are overlapped in space-time, two-photon absorption occurs on the photosensitive surface of the detection unit, a two-photon current signal related to the probability of the two pulses arriving at the same time is generated, and a two-photon balanced output signal is obtained through differential amplification. The pulse repetition frequency is scanned in a grid manner within a preset range, the two-photon time-gated window is periodically shifted relative to the measurement pulse flight time period, and a repetition frequency point meeting a predetermined criterion is formed on a repetition frequency axis. The frequency difference between adjacent repetition frequency points or the frequency offset of the same repetition frequency point in different sweep frequency periods is recorded, and the measurement pulse round-trip flight time and the target distance are solved in combination with the refractive index and the light speed constant.