11 results about "Magneto-optic effect" patented technology

The application discloses an optical neural network nonlinear activation system, method and device, relates to the technical field of optical neural networks, and because a magneto-optical material is integrated in a phase adjustment waveguide arm of a nonlinear activation unit, a controller can control the magneto-optical material of the phase adjustment waveguide arm to generate a magneto-optical effect according to a current activation function type and weights of the optical neural network, so as to perform phase adjustment on an optical signal transmitted through the phase adjustment waveguide arm, and make the nonlinear activation unit adapt to the current activation function type and the weights, perform corresponding nonlinear calculation on a target input signal, and realize dynamic switching of multiple nonlinear activation functions, thereby improving the flexibility of the optical neural network.

The invention discloses a magneto-optical effect-based dynamic zooming method and an optical system, and the method comprises the steps: arranging at least one magneto-optical crystal between a pre-amplifier and a main amplifier, so as to achieve the dynamic zooming through the magneto-optical effect; wherein the magneto-optical crystal is obtained by combining anisotropic materials with matched refractive indexes, and the anisotropic materials are processed into complementary parabola shapes. According to the invention, the magneto-optic effect is utilized to realize dynamic zooming, and the mode of complementary combination of the crystals with matched refractive indexes is utilized to solve the problem that the additional wavefront shape does not conform to the demand. Compared with an electro-optical effect scheme, an applied magnetic field is a uniform magnetic field along a transmission direction, so that a depolarization problem caused by a transverse component is avoided; compared with the scheme of aperture division, grating division and the like, the dynamic zooming can be realized on the premise of not influencing the output capability of the laser.

The application discloses a temperature measuring method and device based on a Faraday magneto-optical effect of magnetic nanoparticles, and belongs to the technical field of nano material testing. The method comprises the following steps: placing a magnetic nanoparticle sample in a target area, and making the magnetic nanoparticles generate a magnetization response through an applied direct current excitation magnetic field; adopting a polarized light to irradiate the magnetic nanoparticles in the coaxial direction of the magnetic field, so that the Faraday magneto-optical effect occurs between the magnetic nanoparticles and the sample; taking a sample without adding magnetic nanoparticles as a control group, applying an excitation magnetic field with the same amplitude and opposite direction to the applied direct current excitation magnetic field to the sample, and detecting the emergent light; calculating the Faraday rotation angle generated by the magnetic nanoparticles according to the detected emergent light; and performing nonlinear fitting on the Faraday rotation angle generated by the magnetic nanoparticles and the applied direct current excitation magnetic field by using a Lenz function, so as to obtain the temperature of the magnetic nanoparticles in the target area. The application can realize remote and non-invasive in-vivo temperature measurement.

According to the scheme, the all-fiber mechanical vibration sensor which is based on the magneto-optical effect and senses vibration motion through the optical technology is provided, the modern optical fiber technology and the optical interferometer principle are utilized, optical fibers are adopted as sensing materials and optical transmission materials, and sensing of mechanical vibration to be detected is achieved through light beams in the optical fibers. Sensing parts do not contain devices which are susceptible to external electromagnetic interference and damage the insulation degree, such as conductive wires, and optical sensing vibration information can be accurately and safely completed in a passive, non-contact and loss-free manner at a high speed. The optical fiber sensing device has the advantages of simple optical fiber sensing structure, small size, high reliability, high response speed, wide signal frequency band, high safety and the like. The all-fiber mechanical vibration sensor can be used for sensing and monitoring vibration states and vibration characteristics of various rotating machines, and can also be used for optically sensing and monitoring vibration states of non-rotating machines, so that the mechanical equipment can realize intelligent and safe operation.

The invention discloses an interactive dynamic appearance assembly structure, a forming method and a packaging box, the interactive dynamic appearance assembly structure structurally comprises a light-emitting module, a power supply module and a magnetic change module, the light-emitting module is electrically connected with the power supply module, and the magnetic change module is arranged on the upper layer of the light-emitting module; the light-emitting module comprises a base material layer, and a first conductive layer, a first protective layer, a light-emitting layer, a second conductive layer and a second protective layer are arranged on the base material layer from inside to outside. The magnetic change module is arranged on the outer layer of the protective layer II and comprises a magnetic particle colloid layer and a protective layer III which are arranged from inside to outside; when a circuit of the assembly structure is not connected, a mobile phone and other magnetic devices approach to trigger the magneto-optical effect of the magnetic particle colloid layer, and local dynamic color changing of the package is achieved; after the circuit is connected, the pattern of the electroluminescent layer is displayed through the colloid layer, the spiral coil is electrified to generate a magnetic field to rearrange the magnetic particles to form a new magneto-optic effect, and the interactive experience and the visual attraction are improved.

The invention provides a magnetic domain imaging method based on a magneto-optical effect, and the method comprises the steps: respectively obtaining a first magnetic domain image and a second magnetic domain image when a polarization adjustment device carries out the polarization adjustment of detection light, and further carrying out the processing including difference calculation, so as to obtain a third magnetic domain image, thereby improving the contrast ratio of the magnetic domain images, and improving the imaging precision. The detection effect is improved; the invention further provides a magnetic domain imaging device based on the magneto-optical effect and a magnetic domain imaging method based on the magneto-optical effect.

The application discloses a fiber current transformer constituted by a laser resonant cavity, relates to a current detection technical field, and particularly relates to a fiber current transformer in a high-voltage transmission line, which utilizes fiber sensing technology to rapidly detect the current in a wire and is suitable for real-time detection of the current in a high-voltage line; the fiber current transformer comprises a 980nm pumping source, a wavelength division multiplexer, an erbium-doped optical fiber, a 1 / 4 wave plate, a 1550nm Faraday magneto-optic effect optical fiber coil, a mirror, a 1550nm fiber grating, a photoelectric detector and a spectrum analyzer; and has the advantages of high sensitivity, high resolution, fast inquiry speed, no phase deviation and no sine response.

The invention discloses a terahertz wave polarization modulation encryption method based on a Faraday optical rotation effect, and the method comprises the steps: transmitting an initial signal by a transmitting end through a terahertz laser signal source; generating a continuously deflected modulation signal after passing through an yttrium iron garnet sheet with a variable magnetic field applied in the encryption device, and spreading the modulation signal to the space; after the receiving end receives the control secret key, the decryption device is controlled to change a magnetic field at the same frequency, the encrypted modulation signal subjected to space propagation passes through the yttrium iron garnet sheet in the decryption device, then the deflection angle of the encrypted modulation signal is restored, and then the encrypted modulation signal passes through the polarization analyzer and is received by the signal detector. The yttrium iron garnet material is innovatively used in the terahertz wave band, continuous and real-time magnetic polarization modulation is carried out through the magneto-optical effect, the device is simple in structure, no complex mechanical structure exists, compared with mechanical polarization modulation, more flexibility is achieved, and meanwhile abrasion of mechanical modulation and time delay of a transmission device are avoided.

The application discloses a high-sensitivity special-shaped core magnetic sensitive optical fiber and belongs to the technical field of optical fibers. The special-shaped core magnetic sensitive optical fiber comprises a cladding and a special-shaped core embedded in the cladding. The cross section of the special-shaped core is a chord-shaped structure composed of a circular arc and a chord, and the radian of the circular arc is greater than pi. The cladding is an air layer except the special-shaped core. The material of the special-shaped core is a rare earth metal element terbium doped magneto-optical glass. The special-shaped core magnetic sensitive optical fiber can generate a significant non-reciprocal magneto-optical effect under the action of a magnetic field, can be used for high-sensitivity magnetic field detection, can realize high-sensitivity, high-stability, miniaturization and high-bandwidth optical fiber magnetic field sensing, and has great significance in the development in the field of magnetic field measurement.

This invention proposes a valley-slow optical waveguide state based on a triangular lattice valley photonic crystal to address the technical problems of weak magneto-optical effect in the optical band and the need for an external strong bias magnetic field in valley-slow optical waveguide states constructed with magneto-optical photonic crystals, as well as the complex fabrication and narrow bandwidth of valley-slow optical waveguide states constructed with honeycomb topological valley photonic crystals. This invention includes a triangular lattice valley photonic crystal with a valley count of 1 and a triangular lattice valley photonic crystal with a valley count of -1. The region formed by the triangular lattice valley photonic crystal with a valley count of 1 is the first region, and the region formed by the triangular lattice valley photonic crystal with a valley count of -1 is the second region. A mustache-shaped interface is formed at the junction of the first and second regions, and a light source is located on the mustache-shaped interface. This invention has advantages such as simpler construction, lower R&D cost, high refractive index, and zero group velocity dispersion, greatly improving the time and intensity of light-matter interaction in waveguide photonic devices, and can be used in integrated photonic devices.

The application discloses a preparation method of a chiral ferromagnetic monodomain liquid crystal material, and synthesizes Sc-doped barium ferrite nanosheets through a hydrothermal method, modifies the nanosheets by using citric acid, obtains ferromagnetic barium ferrite nanosheets, and uniformly disperses the ferromagnetic barium ferrite nanosheets into a chiral liquid crystal matrix; under the action of a weak magnetic field (as low as 30 mT), the anisotropic nanosheet orientation is coupled with the chiral liquid crystal orientation, the nanosheets are oriented along the magnetic field direction, and the ordered arrangement of the chiral liquid crystal matrix is guided; the chiral cluster aggregates and liquid crystal domains in the chiral liquid crystal matrix are migrated and fused, and finally, a wireless, planar defect chiral ferromagnetic monodomain structure is formed. The chiral ferromagnetic monodomain liquid crystal material has magnetic response, and the magneto-optic effect under the action of a magnetic field provides a basis for the application of the chiral ferromagnetic monodomain liquid crystal material in the fields of optical equipment and flexible machines.