70 results about "Terahertz radiation" patented technology

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 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.

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 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.

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 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.

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 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 intensity probe and a packaging method and receiving light path design thereof, and belongs to the field of terahertz radiation intensity detection.The terahertz intensity probe comprises a lens layer, an adhesive layer, a device silicon substrate layer and a receiving light layer, and the first surface of the adhesive layer is connected with the light emitting face of the lens layer in an adhesive mode; the second surface of the adhesive layer is connected with the incident surface of the device silicon substrate layer in an adhesive manner; and the light emitting surface of the device silicon substrate layer is connected with the light receiving layer. According to the terahertz intensity probe, the packaging method thereof and the design of the receiving light path, the technical problem that the measurement precision and accuracy are affected due to serious total reflection loss of terahertz light waves on an interface in the prior art can be solved, the receiving rate of the terahertz waves capable of being received is effectively improved, and the measurement accuracy is improved. And the signal-to-noise ratio and the measurement precision of the terahertz intensity probe are effectively improved.

This invention discloses a terahertz water quality detection chip based on phase change materials and its detection method. The detection chip comprises a substrate, interdigitated electrodes, and a phase change film. The interdigitated electrodes are disposed on the substrate, and a microstructure array is arranged between the interdigitated electrodes. The phase change film covers the interdigitated electrodes and the microstructure array. The area covered by the phase change film serves as a droplet sample loading area. The phase change film transforms between an amorphous and crystalline state, thus being suitable for two detection modes. The phase change film is a thin film formed by GST phase change material, which is a compound formed by the combination of Ge, Sb, and Te elements. The above-mentioned detection chip excites the GST phase change material to generate a photoconductive effect through terahertz radiation, and utilizes the high conductivity of pollutants in water to modulate the local terahertz field. It uses the change in photocurrent with particle concentration to form a quantitative detection relationship, thereby significantly improving the sensitivity of water quality detection while reducing the size of the detection equipment.

An isolator based on a waveguide-based artificial dielectric medium is scalable to a range of desired terahertz frequencies, has non-reciprocal transmission and provides low insertion loss and high isolation at various tunable terahertz frequencies, far exceeding the performance of other terahertz isolators, and rivaling that of commercial optical isolators based on the Faraday effect. Because terahertz artificial dielectrics are low loss, inexpensive, and easy to fabricate, this approach offers a promising new route for polarization control of free-space terahertz beams in various instrumentation applications. Artificial dielectrics are man-made media that mimic properties of naturally occurring dielectric media, or even manifest properties that cannot generally occur in nature. A simple and effective strategy implements a polarizing-beam-splitter and a quarter wave plate to form a highly effective isolator. Performance of the device is believed to exceed that of any other experimentally demonstrated method for isolation of back-reflections for terahertz beams.

A high detectivity infrared and terahertz sensing using a silicon nitride (SiN) nanomechanical resonator functionalized with an optical absorber. The membrane resonator is actuated by a piezo actuator and interrogated by an interrogation laser to determine the intensity of an incident light source. High performances are achieved by striking a fine balance between the frequency stability of the resonator, and its responsivity to absorbed radiation.

The invention relates to the technical field of terahertz technology and signal processing, in particular to a terahertz signal modulation method based on oxygen vacancy engineering. Oxygen vacancy regulation is introduced into the multi-layer dielectric structure, so that optical and magneto-optical response of the functional oxide layer is changed, and instantaneous current and terahertz radiation intensity under laser excitation are enhanced; the optical property of the medium is regulated and controlled by using an interface magnetic reconstruction effect induced by oxygen vacancies, so that stable, continuous and adjustable terahertz signal output is realized, and the limitation of traditional regulation depending on an external light path or a magnetic field is avoided; signals are enhanced and adjusted through regulation and control of intrinsic properties of materials, dependence on complex external light path reflection and synthesis is not needed, system complexity is reduced, and integration and stability of devices are improved; by optimizing the optical response of the dielectric layer, the interaction efficiency of light and a material is improved, so that the pumping laser energy can be more effectively converted into terahertz radiation, and the overall energy efficiency is improved.

A system and method of harvesting energy are provided using a geometric diode and antenna. The geometric diode includes a start portion, end portion, and neck portion joining the start portion and end portion. The geometric diode tapers laterally inward at the neck portion, which defines the narrowest point of the geometric diode. The antenna includes first and second halves forming a bow-tie shape, with inner ends of the antenna contacting respective laterally opposite sides of the neck portion of the geometric diode. A method of using the geometric diode includes harvesting electromagnetic energy such as infrared, microwave, or terahertz radiation through the antenna and into the geometric diode. Example materials used include gold for the antenna. The geometric antenna may be formed from tungsten disulfide, boron nitride, perovskite, molybdenum disulfide, or a MXene nanomaterial composed of transition metal carbides, nitrides, or carbonitrides.

The invention relates to the technical field of emotion regulation, in particular to a method and system for regulating emotion and social behaviors based on terahertz radiation. According to the technical scheme, the method comprises the following steps: directionally irradiating a head target region of a mammal object with terahertz waves; according to the method, by establishing the clear corresponding relation between the specific terahertz frequency and the emotional behavior regulation effect, the long-standing core problems of parameter chaos and unpredictable effect in the field are solved; based on the characteristics of non-ionizing radiation, a safe novel intervention way capable of avoiding side effects of drugs is provided, and the effectiveness and biological safety of operation are ensured through a safety parameter window verified by experiments; the method provided by the invention can generate a stable and repeatable behavior regulation effect.

This invention discloses a terahertz receiver and a focal plane camera device based on a variable capacitor. The receiver includes a connected zigzag inductor and interdigitated capacitors; each finger of the interdigitated capacitor is composed of closely arranged double-cross-shaped repeating units, enabling it to efficiently absorb terahertz waves without the need for an additional absorber. Terahertz radiation changes the dielectric constant of the dielectric, causing changes in capacitance and resonant frequency; detection is achieved by detecting these changes. The focal plane camera device includes an array of the aforementioned receivers. Each receiver is coupled to a zigzag-shaped center feed line via a coupling feed line, and each unit has a different resonant frequency, achieving frequency division multiplexing readout. This invention combines absorption and resonance functions into one, greatly simplifying the structure, achieving high absorption efficiency, possessing dual polarization and intrinsic frequency division multiplexing capabilities, and easily expanding into large arrays. It can be widely applied in fields such as high-sensitivity terahertz passive imaging and spectral analysis.

The present invention relates to a method for processing data associated with a model characterizing the propagation of terahertz (THz) radiation in a 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, the method comprising: providing the model; characterizing the propagation of terahertz radiation in a region of at least one interface between two adjacent media in the spatial region by means of the model, wherein the model has a term which depends on at least one of the following elements: a) the frequency of the terahertz radiation, b) the spatial extension of at least one of the two adjacent media, for example along a first spatial direction.

The invention relates to the technical field of terahertz communication, in particular to a terahertz radiation source SiP module and a design method thereof, and the terahertz radiation source SiP module comprises a packaging shell, a built-in power amplifier chip, a packaging substrate, a metal micro coaxial feed network and an antenna array. The feed network is integrated in an antenna array and is composed of a plurality of stages of T-shaped micro coaxial power dividers, and a part of ports are provided with two impedance conversion structures, so that broadband impedance matching within a 110-170GHz frequency band is realized. The output end of the power amplifier chip is connected with the input end of the feed network through the packaging substrate, the broadband radiation unit of the antenna array is in butt joint with the output port of the feed network, and amplified terahertz signals are radiated to a free space. The module optimizes the performance through integrated design, is suitable for high-frequency terahertz communication and detection scenes, and has the characteristics of compact structure, wide frequency band and high efficiency.

A method for determining at least one property of at least one first layer that can be applied to a substrate using terahertz, THz, radiation, the method including determining at least one property of the substrate, applying a first layer to the substrate, and determining at least one property of the first layer.