107 results about "Terahertz radiation" patented technology

A method for analysing a sample comprising a layer having a first interface and a second interface, the method comprising: Irradiating the sample with a pulse of terahertz radiation, said pulse comprising a plurality of frequencies in the range from 0.01 THz to 10 THz; Detecting radiation reflected from the sample to produce a sample waveform; Obtaining a first reflection waveform from the sample waveform, the first reflection waveform corresponding to the reflection from the first interface; Obtaining a second reflection waveform from the sample waveform, the second reflection waveform corresponding to the reflection from the second interface; Comparing the first reflection waveform with the second reflection wave-form to produce an estimate of a thickness and a complex refractive index of the layer; Producing a synthesised signal using the estimate of the thickness and complex refractive index; Varying at least one of the thickness and complex refractive index to reduce an error between the sample waveform and the synthesised signal; and Outputting the thickness of the layer.

The invention discloses a terahertz technology detection and identification system and method, and relates to the technical field of terahertz technology material detection.The system comprises a femtosecond laser amplifier, a strong field terahertz radiation generation assembly, an electro-optical sampling assembly and a computer, and the femtosecond laser amplifier is used for emitting femtosecond laser pulses; the strong-field terahertz radiation generation assembly is used for generating a strong-field terahertz radiation beam and combining the strong-field terahertz radiation beam with the detection laser after the strong-field terahertz radiation beam penetrates through the to-be-detected sample; the electro-optical sampling assembly is used for electro-optical sampling; and the computer judges whether the to-be-detected sample is a natural material or an artificial material. According to the invention, the self-developed strong-field terahertz time-domain spectroscopy technology is used for detection, and compared with a traditional radioactive ray detection method and weak-field terahertz radiation, the strong-field terahertz radiation has the advantages of high power, high penetrability, high signal-to-noise ratio and the like in addition to low photon energy and no damage characteristics; the subtle differences of different materials of the same material can be identified more accurately, and the accuracy of detecting and identifying the types of the materials is effectively improved.

The invention discloses a polarization-adjustable antiferromagnetic terahertz source based on a MnPt heterojunction. The polarization-adjustable antiferromagnetic terahertz source comprises a MnPt antiferromagnetic thin film layer, a light metal layer and an anti-oxidation layer, according to the invention, the femtosecond laser is used for exciting the femtosecond laser to generate the terahertz wave, the polarization direction of the generated terahertz wave is changed along with the change of the polarization direction of the femtosecond laser, that is, the polarization direction of the laser is changed by 1 degree, the polarization direction of the terahertz is changed by 2 degrees, the change of the azimuth angle of a sample is not needed, and the width of the generated terahertz spectrum exceeds 5 THz. No extra heavy metal layer needs to be added, the size is miniature, and the thickness is smaller than 40 nm. By adjusting polarization and phase difference of femtosecond laser, adjustability of a linear polarization state, an elliptical polarization state or a circular polarization state can be achieved, the structure is simple, a needed light path is simple, assistance of an external magnetic field or current is not needed, micromachining is not needed, the ultra-high external magnetic field interference resistance is achieved, the cost is reduced, and the application range is wide. And integration of the terahertz source is also facilitated.

The invention discloses a terahertz detection unit based on a dielectric couple two-level system and an array detector. The array detector comprises an array composed of resonance detection units. The resonance detection unit comprises a broken line inductor, an interdigital capacitor and a coupling feeder line which are connected, and a dielectric layer and an absorber are stacked on the interdigital capacitor. Wherein the absorber is located above the dielectric layer, so that the dielectric layer isolates the interdigital capacitor from the absorber; and the broken line inductor, the interdigital capacitor, the coupled feeder line and line bodies connected among the components are all made of superconducting materials. The absorber is a grid body made of a non-superconducting metal material. After the absorber is used for receiving terahertz radiation, energy is transmitted to the dielectric medium, a dipole two-energy-level system in the dielectric medium is changed, the dielectric constant of the dielectric medium is changed, then the resonant frequency of the resonance detection unit is changed, and terahertz wave detection and imaging are achieved by analyzing the change of the resonant frequency of the resonance detection unit.

The invention provides a terahertz generation and radiation device based on a double-ellipse conical groove antenna, which mainly comprises a terahertz generation part and a terahertz radiation part, and different device units in the terahertz generation part are used for generating terahertz based on two received light waves with different phase differences. Converting two beams of light waves with a specific phase difference into terahertz waves by using a light wave difference frequency effect, wherein the terahertz waves inherit the phase difference of the light waves; and the terahertz radiation part is used for radiating the terahertz waves to a free space so as to realize beam steering of the terahertz waves in a far field. Furthermore, the invention also discloses a terahertz phased array system. According to the invention, wide-angle and grating lobe-free scanning of terahertz wave beams can be realized, and a large-scale array can be realized.

The invention relates to a terahertz spectrum detection system and method, and the system comprises a laser system, a laser frequency locking system, an optical fiber coupling transmission system, a light spot shaping system, a terahertz fluorescence conversion system, a terahertz radiation source, and a fluorescence spectrum detection system. The laser frequency locking system is used for carrying out frequency locking on the two laser beams, the optical fiber coupling transmission system is used for transmitting the two laser beams after frequency locking to the light spot shaping system so as to shape the two laser beams after frequency locking, and the two laser beams after shaping excite cesium atoms in the terahertz fluorescence conversion system to a first Rydberg state; the terahertz radiation source is used for emitting terahertz light, the terahertz light excites the cesium atoms in the first Rydberg state to the second Rydberg state, and the cesium atoms in the second Rydberg state are de-excited to generate a fluorescence signal; the fluorescence spectrum detection system is used for collecting and detecting fluorescence signals.

The application provides a high-power multicolor terahertz radiation generation device based on beat laser accumulation, which comprises an injector, an electron beam modulation system and a radiation system arranged in sequence; and a femtosecond laser system comprising a femtosecond laser, a first light splitting plate and a first mirror arranged in sequence and parallel to the electron beam transmission axis, the first light splitting plate splits the femtosecond Gaussian laser pulses from the femtosecond laser into first and second path femtosecond Gaussian lasers, the first light splitting plate, a pulse broadening system and the injector are arranged in sequence, and the first mirror, a laser accumulation system and the electron beam modulation system are arranged in sequence; the laser accumulation system generates beat accumulation laser with multiple terahertz cycles after receiving the second path femtosecond Gaussian laser. The device of the application can realize the center frequency of the multicolor terahertz radiation being adjustable, the number of the multicolor being variable, the frequency and time interval being controllable, the layout being simple, the tunability being strong and the flexibility being relatively high.

The invention relates to the technical field of terahertz wave generation and transmission, in particular to a rectangular waveguide output type photoconductive mixer based on effective dielectric silicon waveguide coupling. The photoconductive mixer comprises a photoconductive substrate used for exciting carriers through a photoconductive effect; the metal planar antenna is arranged on the first surface of the photoconductive substrate and is used for converting carrier current into a terahertz radiation signal; the effective medium silicon waveguides are arranged on the second surface and the two side faces of the photoconductive substrate in a coupling mode, and the second surface is opposite to the first surface; the rectangular waveguide is used for receiving and outputting a terahertz signal; the effective medium silicon waveguide comprises a waveguide core and air hole arrays distributed on the two sides of the waveguide core, and the air hole arrays are configured to enable the effective medium silicon waveguide to form a refractive index gradient so as to constrain transmission of signals in the waveguide core. By adopting the method, rectangular waveguide output can be efficiently realized, and the method has the characteristic of high structural integration degree.

Various aspects relate to a sorting container, a sorting system, and a sorting container arrangement, wherein the sorting container comprises: a container; an inlet opening for inputting waste; an outlet opening for dispensing unsorted waste from the container; a conveying device configured to move waste from the inlet opening to the outlet opening; robotic arms; a sorting outlet associated with a waste type, wherein the robotic arm is configured to transfer an item for dispensing sorted waste from the container from the conveying device to the sorting outlet; a source; and a camera configured to detect terahertz radiation emitted by the source and passed through irradiated waste.

This invention discloses a terahertz radiation device and method based on a dual-layer metasurface, belonging to the field of terahertz radiation technology. The terahertz radiation device based on a dual-layer metasurface includes a first metasurface structure layer and a second metasurface structure layer arranged from top to bottom. The phase modulation array of the first metasurface structure layer is composed of multiple first structural units with different geometric parameters and divided into multiple regions. The center rotation angle of the first structural units in each region is different to form a gradient phase distribution. The excitation array of the second metasurface structure layer is formed by multiple second structural units with identical geometric parameters arranged uniformly. Through the vertical layout and coherent superposition between the two structures, the terahertz radiation intensity is enhanced. Simultaneously, through the gradient phase design of the first metasurface structure, a terahertz vortex beam carrying orbital angular momentum is output, effectively solving the problems of weak radiation intensity and poor vortex effect in traditional single-layer structures.

The invention provides a compact integrated broadband test system, which comprises a TFLN integrated chip module, an optical fiber pumping and modulation module, a terahertz radiation and receiving module and a data acquisition and analysis module, and is characterized in that all the modules are integrated to adapt to 200GHz-3.5 THz terahertz radio communication and radar test requirements; the TFLN integrated chip module comprises a TFLN integrated chip, and a thin film lithium niobate TFLN with the x cutting thickness of 500-700 nm is bonded to a SiO2 / 500 [mu] m high-resistance silicon substrate with the thickness of 4700 nm; the optical fiber pumping and modulation module comprises a mode-locked laser, a dispersion compensation unit, a Mach-Zehnder modulator (MZM) and an erbium-doped optical fiber amplifier (EDFA); the terahertz radiation and receiving module comprises a transmitting link, a receiving link and an optical detection branch; the data acquisition and analysis module comprises a balanced photoelectric detector PD, a data acquisition card and analysis software, the terahertz radio communication and radar test requirements can be subjected to data linkage analysis, the test process is simple, and time is saved.

The invention relates to the technical field of optics, and discloses a broadband circular polarization terahertz source and application thereof, and the broadband circular polarization terahertz source comprises a free electron beam moving along a predetermined direction and a stacked bianisotropic metasurface located above the free electron beam; wherein the stacked bianisotropic metasurface comprises at least two layers of metal gratings which form a stacked structure; the at least one dielectric plate is used for separating the metal grating; wherein the number of layers of the dielectric plate is one less than that of the metal grating; and the metal grating and the dielectric plate form a periodic structure together, and are used for coupling evanescent wave energy of the free electron beam into multiple resonant modes so as to excite broadband circular polarization terahertz radiation. According to the technical scheme provided by the invention, the tunable and compact terahertz source with high power output can be realized.

The invention discloses a Terahertz effective radiation power high-accuracy measurement technology based on a twinborn compensation model, and belongs to the technical field of Terahertz power measurement. The Terahertz effective radiation power comprises the following steps: constructing a twinborn compensation model of which other conditions are the same as those of a Terahertz measurement device except that a Terahertz signal is not received, and realizing measurement of thermal radiation noise power such as environment thermal radiation and circuit thermal radiation on time domain distribution; when a terahertz radiation source works, a terahertz power measuring device is used for measuring an overall detection signal containing terahertz effective power signals and thermal radiation noise complex coupling; and through differential processing of the total detection signal and the thermal radiation noise, complex decoupling of the terahertz effective power signal and the thermal radiation noise is realized, so that the terahertz effective radiation power is accurately obtained. Furthermore, corresponding twin compensation models are configured according to different terahertz radiation power measuring devices, so that high-accuracy measurement of the terahertz radiation power by different measuring devices can be realized.

A method for determining a refractive index in a surface region of an object from a production system which has not cooled to an ambient temperature includes emitting terahertz radiation from a transmitter at an angle of incidence to the surface region of the object. The terahertz radiation is reflected from the surface region of the object and received by a receiver. The refractive index of the surface region of the object from a ratio of the emitted and reflected terahertz radiation is determined using an evaluator in communication with the transmitter and the receiver. The influence of surface properties of the object on a portion of the reflected terahertz radiation is taken into account when determining the refractive index.

The present application relates to a kind of underwater acoustic field detection method and system based on terahertz vortex beam interference and topological charge regulation, belong to precision measurement technical field.The terahertz radiation source emits terahertz beam, after collimating by convex lens, it is incident to terahertz vortex beam generator, and incident beam is modulated as vortex beam of specific topological charge;Beam splitter divides vortex beam into reference wave and test wave;Test wave is reflected back by reflector after being, and carries the displacement information of water surface;Test wave carrying water surface displacement information and reference wave interfere at beam splitter;Interference signal is captured by terahertz probe, and according to interference signal, the amplitude, frequency information of water surface displacement is obtained, so as to obtain underwater acoustic field information.The present application is based on the design technology of vortex beam generation and topological charge modulation device of super surface, further improves the integration and detection precision of terahertz water surface displacement detection system, so as to obtain underwater acoustic field information.

The subject matter of the invention is a sensor pixel (1) for an imaging device (2) for examining a sample (3), comprising: an emitter (4), the emitter (4) being designed to emit electromagnetic radiation in a frequency band of a range comprising high frequencies and terahertz frequencies; a resonator (6) which is connected to the emitter (4) for transmission of the emitted radiation, such that the radiation can be coupled into the resonator (6), the resonator (6) being designed to form, using the coupled-in radiation, a radiation field in an examination region (8), the examination region (8) being a volume for receiving the sample (3); and a pump unit (10) which is connected to the resonator (6) and to the emitter (4) for transmission of the radiation, the pump unit (10) being designed to pump a bound state of the radiation field in the examination region (8) by means of the emitter (4). In this way, improved imaging with high-frequency radiation and terahertz radiation is provided.

The application discloses a scalable silicon-based terahertz radiation array source based on a micro-protrusion antenna and a terahertz radiation source. The scalable silicon-based terahertz radiation array source based on a micro-protrusion antenna comprises a plurality of array units composed of cross-coupled harmonic oscillators based on a micro-protrusion antenna, and the plurality of array units are connected to form an n*n array structure of the scalable silicon-based terahertz radiation array source. The scalable silicon-based terahertz radiation array source has a micro-protrusion antenna radiation structure, meets the terahertz frequency and wideband requirements, can be applied to a terahertz radiation source system, and can realize a high working frequency, a high radiation power and a wideband tunable terahertz radiation source array system.

The invention discloses a polar region cloud layer detection method and device based on day and night adaptive multi-mode fusion. The method comprises the following steps: determining a polar region time period mode according to a solar altitude and environment illumination intensity of a polar region observation point; in the polar day mode, collecting a multi-angle polarization thermal image sequence and a visible light image, generating a cloud probability distribution map, and generating a polar day optical thickness map in combination with a physically guided thickness inversion model; in an extreme night mode, quantum radar echoes and terahertz radiation spectrums are collected, a cloud layer vertical distribution probability graph is generated, and an extreme night three-dimensional cloud mask is generated in combination with radar distance-Doppler constraint; and generating a polar region cloud layer full-time detection result based on the polar day optical thickness map and the polar night three-dimensional cloud mask. According to the invention, high-precision and all-weather detection of the polar region cloud is realized by introducing sensing technologies such as quantum radar and terahertz radiation spectrum and combining deep learning and quantum information processing methods.

The invention discloses a method for preparing a bio-organic fertilizer through straw dry fermentation and co-producing biogas, and relates to the technical field of straw treatment. The method comprises the following steps: treating straws by laser etching, plasma and ionic liquid, pretreating by combining microwave and terahertz radiation, screening and modifying strains, preparing a microbial agent by using a composite culture medium, a micro-fluidic reactor and a photobioreactor, adding nano mineral substances and a composite binder when raw materials are blended, fermenting by adopting a bionic fermentation tank, and intelligently controlling temperature and ventilating; the biogas is purified and detected by an advanced technology, and the organic fertilizer is prepared by a special process. The straw is efficiently treated, the fermentation efficiency is improved, the biogas yield is greatly increased, and the high-quality bio-organic fertilizer is produced; the advantages of environmental protection, energy production and soil improvement are integrated, straw resource utilization is achieved, and multiple economic, social and environmental benefits are brought.

The application discloses a spin terahertz emitter and a chiral regulation method and a preparation method thereof, and belongs to the field of terahertz emission. The spin terahertz emitter is a three-layer structure including a ferromagnetic material layer, a non-ferromagnetic material layer and an antiferromagnetic layer. The antiferromagnetic layer adopts a preset crystal phase NiO single crystal antiferromagnetic material, CrSb or Mn3Sn. Under the irradiation of a femtosecond laser, the antiferromagnetic layer generates a laser impact magnetic moment. The precession of the laser impact magnetic moment generates a spin polarization current. The spin polarization current is injected into the non-ferromagnetic layer to generate a transient charge current, and then radiate terahertz, thereby realizing efficient spin terahertz radiation. Further, the magnetic moment direction of the ferromagnetic material layer in the spin terahertz emitter is reversed by rotating the direction of an external magnetic field or by a spin-orbit moment effect, thereby realizing efficient regulation of terahertz chirality.

Apparatus for generating THz (terahertz) radiation, the apparatus comprising: a substrate; a planar array of subwavelength antennas formed on the substrate having rotational symmetry, Cn, of order “n” greater than or equal to 3 and rotational symmetry cycle 2π / η, which are excitable by near infrared (NIR)_pump radiation to radiate THz radiation having wavelengths that are substantially larger than characteristic dimensions of the subwavelength antenna; wherein the array comprises a plurality of sections each comprising plurality of subwavelength antennas exhibiting a spatial pattern different from that of an adjacent section of the plurality of sections.

The application discloses a kind of low-temperature blackbody source radiation power calibration methods, comprising the following steps: building low-temperature test system, the radiation power of low-temperature blackbody source is calibrated;Change the bath temperature of superconducting dynamic inductance detector, test the response curve of superconducting dynamic inductance detector under different bath temperature, and extract response amplitude;The number of quasi-particles corresponding to the bath temperature of superconducting dynamic inductance detector is calculated;Response amplitude and quasi-particle number are fitted to obtain the function of quasi-particle number of superconducting dynamic inductance detector about response amplitude;The bath temperature of detector is reduced to below 100mK, the temperature of low-temperature blackbody source is reduced to below 4K, change the temperature of low-temperature blackbody source, test the curve of superconducting dynamic inductance detector under different blackbody source temperature, and extract amplitude;The corresponding quasi-particle number is calculated;The radiation power of low-temperature blackbody source is calculated from quasi-particle number;The radiation efficiency of low-temperature blackbody source is calculated.The application can solve the problem that blackbody source terahertz radiation power cannot be calibrated at extremely low temperature.

The invention discloses an intervention and analysis method of terahertz radiation on Alzheimer's disease model nematodes, which comprises the following steps: directly performing radiation intervention on the Alzheimer's disease model nematodes by adopting terahertz waves, and performing behavioral analysis, fluorescence analysis and data analysis on the nematodes after intervention. The behavioral analysis comprises, but is not limited to, analysis of life, exercise ability and ingestion ability of the nematodes, and the fluorescence analysis comprises, but is not limited to, oxidative stress and aging condition analysis. According to the intervention and analysis method for the Alzheimer's disease model nematodes by the terahertz radiation, a brand-new analysis method is provided for evaluation of terahertz wave intervention and biological effects on the animal level.

The invention relates to a method for processing data associated with a model characterizing a propagation of terahertz (THz) radiation in a spatial region, the spatial region comprising at least one terahertz device for emitting and / or receiving terahertz radiation and / or at least one object which can be subjected to terahertz radiation, said method comprising: providing the model; characterizing, by means of the model, a propagation of the terahertz radiation in the area of at least one boundary surface between two media that adjoin in the spatial region, wherein the model has a term that depends of at least one of the following elements: a) frequency of the terahertz radiation, b) spatial expansion of at least one of the two adjoining media, for example along a first spatial direction.

An asymmetric S-shaped complementary metasurface biosensor for sensing glucose concentration includes a metallic sheet for receiving a glucose sample, a first arm, and a second arm. The first arm is configured as an S-shaped slot. The second arm is configured to be an S-shaped slot which is a smaller mirror image of the first arm. Electromagnetic coupling between the asymmetric S-shaped slots leads to the excitation of the resonances. An asymmetric resonance is excited that features a very small bandwidth when a terahertz radiation is swept across the metallic sheet. A redshift in the response is indicative of a glucose concentration in the glucose sample.

The invention relates to a terahertz (THz) apparatus for transmitting and / or receiving THz radiation, comprising at least one THz element, which is designed to transmit and / or receive THz radiation, and a digital data processing device, wherein in particular the digital data processing device is designed to at least temporarily process a first signal of at least one component of the apparatus.

This invention discloses a voltage-controlled subferromagnetic terahertz radiation source, comprising a sequentially deposited heavy metal layer, a subferromagnetic alloy layer, a heavy metal alloy layer, an oxide layer, and a conductive layer. The oxide layer is a gadolinium oxide layer, the subferromagnetic alloy layer is an iron-gadolinium alloy layer, the conductive layer serves as the upper electrode connected to the voltage source, and the heavy metal layer serves as the lower electrode grounded. This invention utilizes the hygroscopic property of the gadolinium oxide layer to achieve the ionization of water molecules into hydrogen ions, and achieves phase control of the terahertz wave generated by the subferromagnetic terahertz source by voltage-controlled hydrogen atom injection. The structure is simple, low-cost, and the controlled state is stable.

The present invention provides a handheld security inspection device and a security inspection method based on terahertz technology, which relates to the technical field of terahertz applications. A terahertz detection component detects and receives terahertz waves radiated by a target, converts the terahertz waves into electrical signals and sends them to a signal acquisition and processing module; a laser ranging module measures the distance from the handheld security inspection device to the target in real time; the signal acquisition and processing module acquires the electrical signals at intervals, calculates the difference in terahertz radiation intensity between the previous moment and the current moment, compares the intensity difference with a target threshold corresponding to the distance, and determines whether there are prohibited items.

The invention discloses a high-stability liquid line intensity terahertz radiation generation device which comprises a femtosecond laser, an optical chopper, a first off-axis parabolic mirror, a liquid line generation unit, a second off-axis parabolic mirror, a third off-axis parabolic mirror, an attenuation piece, a low-pass filter and a terahertz energy detector. Wherein the liquid line generation unit integrates a liquid circulation subsystem and a gas power compensation module composed of a gas storage tank and a pressure regulating valve, and the module provides continuous gas pressure for a liquid flow path in the power neutral period of the peristaltic pump, so that the flow jitter and surface turbulence of a liquid line are effectively inhibited; the problems of terahertz signal fluctuation and intensity attenuation caused by liquid line instability are solved, high-intensity and high-repetition-frequency terahertz radiation output with stability improved by about four times is finally achieved, and a feasible scheme is provided for practicability of a liquid terahertz source.

The invention discloses a terahertz radiation source device and system. The terahertz radiation source device comprises a substrate; the barrier layer is stacked on the substrate; the channel layer is stacked on the barrier layer, and two-dimensional electron gas is generated in the channel layer above the interface of the barrier layer and the channel layer; the source electrode, the drain electrode and the grid electrode are arranged on the channel layer, the source electrode and the drain electrode are distributed on the two sides of the grid electrode, and the source electrode and the drain electrode are electrically connected with two-dimensional electron gas. Two-dimensional electron gas is electrically connected with the source electrode and the drain electrode through the channel layer, ohmic contact resistance can be reduced, saturation current can be increased, energy conversion efficiency can be improved, and output power can be improved.