22 results about "Photon" patented technology

In accordance with preferred embodiments of the present invention, a method for imaging tissue, for example, includes the steps of mounting the tissue on a computer controlled stage of a microscope, determining volumetric imaging parameters, directing at least two photons into a region of interest, scanning the region of interest across a portion of the tissue, imaging a plurality of layers of the tissue in a plurality of volumes of the tissue in the region of interest, sectioning the portion of the tissue and imaging a second plurality of layers of the tissue in a second plurality of volumes of the tissue in the region of interest, detecting a fluorescence image of the tissue due to said excitation light; and processing three-dimensional data that is collected to create a three-dimensional image of the region of interest.

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 relates to a multiphoton subpulse STED-SPIM (Selective Plane Illumination Microscopy) microscopic system realized by single wavelength, characterized in that the femtosecond pulse laser emitted by a femtosecond single wavelength laser is transmitted to a first splitter through a first polarization regulator to be divided into two beams of light, and a first beam of light is successively transmitted to a second polarization regulator, a second splitter, a third polarization regulator and a quarter-wave plate along a Y-axial direction to form an excitation light beam; a second beam of light is transmitted to an STED photoquenching system, and the light outputted by the STED photoquenching system is successively emitted into the second splitter, the third polarization regulator and the quarter-wave plate to be modulated into donut-shaped focus spots to form a quenching light beam; a scanner is used for scanning the excitation light beam and the quenching light beam to generate an excitation plate light source and an STED quenching plate light source; an excitation plate light source and an STED quenching plate irradiate an object to be imaged through an excitation objective lens to allow the flourescent dye of the object to be imaged to excite fluorescence, and excited fluorescence is imaged through an imaging objective lens, and is emitted to a photosensitive element or an analysis element successively through an optical filter and a convergent lens.

A making method of a composite type biological chip based on a photonic crystal comprises four steps which are preparation of hard substrates, preparation of photonic crystal thin membranes, connection of membranous substrates and surface treatment of the substrates. (1) the preparation of hard substrates: common hard substrates are cleaned by soapy water, washed by de-ionized water and dried, and amino-group or hydroxyl is decorated on the surfaces of the substrates; (2) the preparation of photonic crystal: the nano-microspheres such as specific monodisperse silicon dioxide or polystyrene and the like, which are different in size according to the positions of testing signals, are assembled on the surfaces of the treated substrates to form the photonic crystal thin membrane with the thickness of 20 to 30 microns (3) the connection of membranous substrates: the surface of the photonic crystal thin membrane is laid with a layer of the membranous substrate and the connection is fixed by utilizing the chemisorption or the mutual function between positive and negative charges; (4) the surface treatment of the substrates: by using the methods such chemisorption and the like, chemical groups which can be fixedly connected with biomolecules to be tested are decorated on the membranous layer parts of the surfaces of the composite substrates which are formed in the step (3).

The invention discloses a polystyrene photon crystal and the optic switch using the polystyrene photon crystal. The photon crystal makes quartz as a basal lamina where preparing a layer of polystyrene film on which periodic tetragonal arranged bores are etched. The optic switch comprises: a polystyrene photon crystal whose two end in the lateral direction are respectively connected with a first polystyrene film wave-guide and a second polystyrene film wave-guide, a first edge glass and a second edge glass. The invention has the advantages of: the semi-conducting material is replaced with the polystyrene, the high switch contrasted optical switch is realized by the third-order non-linear coefficient of the polystyrene, the time response is less than 25 fs, the preparation is simple, the using and measuring is convenient, the integration is suitable.

Short-wavelength photons are used to ablate material from a low work function target onto a suitable substrate. The short-wavelength photons are at or below visible wavelength. The elemental composition of the deposit is controlled by the composition of the target and the gaseous environment in which the ablation process is performed. The process is carried out in a deposition chamber to which a short-wavelength laser is mounted and which includes a substrate holder which can be rotated, tilted, heated, or cooled. The target material is mounted onto a holder that spins the target during laser ablation. In addition, the deposition chamber is provided with a vacuum pump, an external gas supply with atomizer and radical generator, a gas generator for producing a flow of molecules on the substrate, and a substrate cleaning device, such as an ion gun. The substrate can be rotated and tilted, for example, whereby only the tip of an emitter can be coated with a low work function material.

The invention discloses a photonic chip and a preparation method thereof. The chip includes a lithium niobate film modulator array (1), a first optical coupling array (2) and a silica waveguide wavelength division multiplexer (3), the lithium niobate film modulator array (1) is composed of one or more lithium niobate film modulators and used for modulating light signals; the first optical couplingarray (2) is composed of one or more first optical coupling structures, one ends of the first optical coupling structures is connected to the corresponding lithium niobate film modulators, and the other ends of the first optical coupling structures is connected to the silica waveguide wavelength division multiplexer (3) to transfer the modulated light signals to the silica waveguide wavelength division multiplexer (3); and the silica waveguide wavelength division multiplexer (3) is used for wavelength division multiplexing to the modulated light signals. Single chip integration of an on-chiplithium niobate film modulator and an on-chip wavelength division multiplexing structures is achieved, and part integration is improved.

The application discloses a narrow linewidth semiconductor laser that solves the problem in the prior art that using a long long-cavity structure to achieve a narrow linewidth in a waveguide results in increased propagation loss of light in the waveguide. The narrow linewidth semiconductor laser comprises a semiconductor light source and a passive filter. The passive filter comprises a waveguide grating coupler and a Bragg grating reflector. The semiconductor light source is configured to be connected to the passive filter. The waveguide grating coupler is configured to radiate the received light emitted by the semiconductor light source to the Bragg grating reflector and return the reflected light of the Bragg grating reflector back to the semiconductor light source. The narrow linewidthsemiconductor laser, by means of filter feedback and the three-dimensional space structural design, can not only avoid the long-cavity design to achieve low loss, but also is easy to integrate by means of the silicon-based and excellent spatial structure, thereby enabling large-scale photon integration.

The invention discloses a broadband spectrum shaping device which comprises a plurality of asymmetric Mach-Zehnder interferometers which are connected in series and have different shaping parameters. The asymmetric Mach-Zehnder interferometer is provided with two interference arms with different arm lengths; the shaping parameter is an arm length difference and/or a coupler light splitting coefficient. The invention further discloses a calculation type spectral measurement device. The broadband spectrum shaping device is based on a common waveguide structure, does not need higher process precision like a grating or a photonic crystal device, does not introduce additional scattering loss, is easy to design, does not need higher processing precision, and has larger working bandwidth and higher precision. According to the calculation type spectrum measurement device, the input spectrum can be reconstructed with high precision through single measurement, due to the fact that the broadband spectrum shaping device is adopted, the manufacturing difficulty and the manufacturing cost are greatly reduced, meanwhile, the measurement precision is effectively improved, and the practicability of the calculation type spectrum measurement device is far better than that of an existing calculation type spectrograph.

The invention relates to a polarization brightened type photonic crystal optical thin film, which belongs to the technical field of liquid crystal display. The photonic crystal optical thin film comprises a light exit surface, a bottom surface and four side faces, wherein the light exit surface is arranged opposite to the bottom surface; the four side faces are sequentially connected with one another and the upper and the lower ends are respectively connected with the bottom surface and the light exit surface; and the light exit surface is provided with a transmission type two-dimensional photonic crystal unit array. The optical thin film can increase the optical efficiency and integration level of the liquid crystal display, reduce the thickness and cost of a backlight module and realize uniform light exit of the two-dimensional photonic crystal thin film.

The invention relates to a measuring device for picosecond time resolution detection of a single photon weak signal. An optical pulse emission controller is connected with a microsecond optical pulseemitter, a picosecond pulse laser mode locker, a condenser, a sample bin, a fluorescence collector, an optical path transmitter, a color separation grating, an optical path aggregator, a light intensity detector, a preamplifier and a signal detection circuit in sequence; and the picosecond pulse laser mode locker is sequentially connected with the signal detection circuit. The measuring method comprises the following steps: an excitation light source emits a light beam to irradiate a sample to reach an electron excited state, and the device detects the time when a single fluorescence photon emitted by the sample reaches a signal detector to obtain the service life of the excited state; in addition, fluorescence emitted by excited state electrons returning to the ground state is fed back tothe light intensity detector through the optical path transmitter and is converted into an emission spectrum signal. According to the invention, the femtosecond oscillation stage is adopted to calibrate the time, and a standard is established for accurately measuring the technical performance of ultra-fast attenuation.

An instantaneous frequency measurement system based on a differential optical time stretching principle relates to the field of microwave photonics, ultrafast measurement and real-time measurement, and is characterized in that a light output end of a pulse laser light source is connected with one end of a dispersion module I, the other end of the dispersion module I is connected with an input end of a polarization controller, and an output end of the polarization controller is connected with a light input end of a modulator; one output port of the modulator is connected with the input end of the optical circulator I; the other output port of the modulator is connected with the input end of the optical circulator I, the other output port of the modulator is connected with the input end of the optical circulator II, the port of the optical circulator I and the port of the optical circulator II are respectively connected with one end of the dispersion module II, and the port of the optical circulator I and the port of the optical circulator II are respectively connected with the first optical input port and the second optical input port of the balance detector. The system can relieve the pressure of rear-end electronic equipment, eliminates the distortion influence of uneven laser pulse envelope on measurement through differential detection, and can perform real-time and accurate ultrafast measurement on multi-frequency signals.

The invention relates to a method for secure computing and/or communication. An entangled photon (118) is generated such that each participant receives a series of light pulses. Each party has private information (110, 112) that is never transmitted over a public or private communication channel. Instead, each party converts its respective private information (110, 112) into a measurement basis by an encryption process (114, 116), and then applies the measurement basis to the entangled photons (118). After a measurement process, such as a quantum frequency conversion (122, 124), the reference index is published (124, 126) such that calculations can be performed (128) without directly or indirectly revealing private information.

The invention discloses a two-photon fluorescent material benzoxazole-based pyridinium salt as well as a preparation method and application thereof. The two-photon fluorescent material benzoxazole-based pyridinium salt is a water-soluble two-photon induced fluorescent material, is low in toxicity, has good membrane penetration performance, can enter cells, and can be used for the two-photon fluorescent confocal microscopic imaging. A structural formula of the two-photon fluorescent material benzoxazole-based pyridinium salt is as follows: (shown in the description).