54 results about "Terahertz detector" patented technology

The invention relates to a terahertz-Raman integrated detection system and method. The detection system comprises a fusion mainframe box and an integrated probe arranged at a sample detection end on the fusion mainframe box, a Raman spectrum module, a terahertz spectrum module, a terahertz optical module and a data analysis module are arranged in the fusion mainframe box; the Raman spectrum module is composed of a Raman laser, a Raman light filter, a Raman grating and a Raman detector which are sequentially connected through a light path; the terahertz spectrum module is composed of a terahertz femtosecond laser, a transmitting photoconductive antenna, a receiving photoconductive antenna and a terahertz detector which are sequentially connected through a light path; the data analysis module is in communication connection with the Raman detector and the terahertz detector and is used for synchronously processing data transmitted by the Raman detector and the terahertz detector. Compared with the prior art, the integrated probe synchronously collects two kinds of spectral data and carries out fusion processing on the two kinds of spectral data through the data analysis module, and the device has the remarkable effects that the device integration degree is high, the detection efficiency and accuracy are greatly improved, and the application range is wide.

The invention discloses a multi-mode nanometer measurement system and method based on terahertz scattering type scanning near-field optical microscopy and multi-frequency electrostatic force microscopy, and belongs to the technical field of near-field imaging, the measurement system comprises an AFM main body, a terahertz source, an optical path system, a terahertz detector, a multi-frequency signal generator and two phase-locked amplifiers; terahertz waves emitted by the terahertz source reach the terahertz detector through the optical path system, and near-field optical signals are obtained. The AFM comprises a metal coating probe; the multi-frequency signal generator generates sinusoidal signals with frequencies of omega1 and omega2; a sample is placed on the scanner, and the cantilever beam is controlled to vibrate at the frequency omega 1; an alternating voltage with the frequency of omega 2 is applied to a metal coating probe arranged at the top end of the cantilever beam; laser emitted by the laser is reflected to the light spot position detector through the cantilever beam, and morphology and electrostatic force signals are obtained through the two lock-in amplifiers respectively. According to the invention, a morphology signal, an optical signal and an electrostatic force signal can be synchronously obtained through single scanning.

The present application relates to the technical field of electronic circuit, and especially relates to a readout circuit of a terahertz detection array, which comprises: a readout link at least comprising a current feedback instrumentation amplifier, a programmable gain amplifier and an incremental analog-to-digital converter connected in sequence; the current feedback instrumentation amplifier amplifies the signal output by the detector and outputs a first-stage amplified signal, the current feedback instrumentation amplifier comprises an instrumentation amplifier body and a first ripple suppression module, the first ripple suppression module comprises a first redundant segmented current steering DAC and a first DAC code register; the programmable gain amplifier further amplifies the first-stage amplified signal, the programmable gain amplifier comprises a gain amplifier body and a second ripple suppression module, and the second ripple suppression module comprises a second redundant segmented current steering DAC and a second DAC code register. The present application effectively reduces the chip area and power consumption while ensuring that the readout circuit of the terahertz detection array has high gain, low noise and low offset.

A method of forming a bismuth chalcogenide film is disclosed including the steps of (a) forming at least one bismuth (Bi) elemental layer on a substrate, (b) forming at least one selenium (Se) or tellurium (Te) elemental layer on the substrate, and (c) after steps (a) and (b), heating the substrate to form a bismuth chalcogenide film.

The invention relates to the technical field of terahertz detection, in particular to a signal measurement method for a terahertz wave transmission system. According to the technical scheme, the method comprises the following steps that a terahertz source is used for emitting terahertz waves, and after the terahertz waves are transmitted through one or more optical assemblies, stable transmission light beams are formed; an image of the transmission light beam is collected through a terahertz detector, and an original gray level image is obtained; and carrying out image processing on the original grayscale image, and extracting a light spot area. A complete two-dimensional light spot image is obtained at a time through the area array detector, an effective light spot area is automatically extracted in combination with an image processing algorithm, coordinate mapping is carried out, and efficient and stable measurement of terahertz wave energy distribution is achieved; by calculating light spot center energy and comparing energy changes under different optical assembly configurations, the transmission loss of the assembly can be quantitatively analyzed, and a reliable and quantifiable measurement means is provided for terahertz system debugging, assembly performance evaluation and multi-scene application.

1. Name of the product in this design: Terahertz detection probe with integrated intelligent display function. 2. Purpose of this design: This design is intended for use as a probe view when installed on a terahertz detector. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

A metal-optical Tamm enhanced terahertz detector provided by the present invention is characterized in that a metal-optical Tamm resonant cavity comprises an upper Bragg reflector, a lower Bragg reflector, a substrate and a metal reflector, the upper Bragg reflector is formed by permutation and combination of double-period high-resistance silicon and an air medium, a single-period structure is that an air cavity is wrapped in the high-resistance silicon, and the lower Bragg reflector is formed by permutation and combination of the high-resistance silicon and the air cavity; the air cavity covers the terahertz detector, and the periphery of the air cavity is of a high-resistance silicon supporting structure and is used for combining to form an upper Bragg reflector; the lower Bragg reflector is of an air-high-resistance silicon-air sandwich structure, the upper portion and the lower portion of high-resistance silicon wrap an air cavity, and a high-resistance silicon supporting structure is arranged on the periphery of the air cavity and used for forming and fixing the lower Bragg reflector. According to the terahertz detector, the high quality factor and low loss characteristics of the resonant cavity are utilized, the resonant filtering function of terahertz signals is achieved, meanwhile, the interaction between the terahertz signals and the sensitive element of the detector is improved, and efficient detection of the terahertz signals is achieved.

This invention relates to a planar superlens for spaceborne terahertz detectors. The planar superlens comprises an independent aluminum foil, on which an array of resonant units arranged in concentric rings is disposed. The resonant unit array includes various C-shaped resonant units with different structural parameters, each C-shaped resonant unit being a C-shaped hole structure etched into the aluminum foil. C-shaped resonant units with the same structural parameters are arranged at equal intervals on a ring band with the same arrangement radius, forming, from the inside out, a paraxial fine control module, a mid-ring band phase compensation module, a mid-to-far ring band phase modulation module, and an edge region phase coverage module. Compared with existing technologies, the superlens proposed in this invention has outstanding features such as large depth of focal length, tight focusing, lightweight, low cost, and resistance to space environments. It is particularly suitable for integration into terahertz detection payloads of meteorological satellites, which are extremely sensitive to weight and volume, and can be used for remote sensing missions such as ice cloud detection and atmospheric composition spectral line observation.

The application provides a high-resolution near-field terahertz time-domain spectroscopy system and a high-precision tomography method, which comprises: a first terahertz source and a second terahertz source for generating a first terahertz pulse and a second terahertz pulse under the triggering of a first pulsed laser and a second pulsed laser respectively; a terahertz detector for receiving a third terahertz pulse and a fourth terahertz pulse generated by the radiation of a sample under the triggering of a third pulsed laser; the third terahertz pulse and the fourth terahertz pulse are generated by the radiation of the sample to the first terahertz pulse and the second terahertz pulse respectively; a pulsed laser light path for transmitting the first pulsed laser, the second pulsed laser and the third pulsed laser; the distance between the sample and the first terahertz source, the distance between the sample and the second terahertz source and the distance between the sample and the terahertz detector are all less than the terahertz wavelength. The application simultaneously utilizes near-field radiation technology and near-field detection technology to improve the resolution of the system and reduce the terahertz transmission loss.

The application discloses a kind of based on machine learning auxiliary terahertz tobacco nondestructive testing device and method, belong to nondestructive testing technical field.The device of the present application includes laser generation module, beam splitter, terahertz transmitter, dual-function switchable workbench, detection light path module, terahertz detector and control and processing module, control and processing module inlay integration is the machine learning model specially designed for tobacco sample, for the terahertz time-domain spectroscopy data of sample to be detected is handled, obtains complete terahertz time-domain signal, simultaneously, can synchronous realization tobacco precision determination and moisture content rapid prediction.The present application has the advantages of miniaturization, low cost, high efficiency and high accuracy, is suitable for the nondestructive, real-time quality monitoring of whole process of tobacco production.

An agricultural system with an agricultural harvester has a terahertz sensor. The terahertz sensor includes at least one a terahertz source disposed to direct electromagnetic radiation toward a harvest material of the agricultural harvester. A terahertz detector is disposed to detect the terahertz electromagnetic radiation after the terahertz electromagnetic radiation interacts with the harvest material. A controller is operably coupled to the terahertz detector and is configured to detect a harvest-related parameter based on a signal from the terahertz detector and to perform an action based on a detected parameter.

The application discloses a ternary transition metal chalcogenide and application thereof in a terahertz detector, and realizes high-speed, high-sensitivity and room-temperature wide-spectrum terahertz detection under the driving of a strong topological surface state of the ternary transition metal chalcogenide.

The invention provides a novel terahertz spectrometer. The device mainly comprises a terahertz complex color light source system, a collimation module, a long-wave-pass optical filter, a terahertz tunable filter, a voltage supply module, a chopper, a controller, a to-be-detected sample, a focusing module, a terahertz detector, a data collector and a measurement and control system. The terahertz complex-color light source system is used for generating complex-color terahertz light beams, the collimation system is used for generating parallel light, the long-wave-pass optical filter is used for filtering long-wave-band components in the light source, the terahertz tunable filter and the voltage supply module are used for converting the complex-color light beams into monochromatic light beams, and the chopper and the controller are used for reducing measurement noise. The focusing module, the terahertz detector and the data collector are used for measuring the intensity of terahertz light beams, and the measurement and control system is used for controlling the whole system. Compared with an existing common terahertz spectrometer, the novel terahertz spectrometer has the advantages of being low in cost, high in vertical coordinate measurement accuracy (about 0.5%), high in measurement speed (about second magnitude) and the like. The novel terahertz spectrometer can provide a new scheme for the terahertz spectrum measurement field, the new scheme and an existing terahertz spectrum measurement method can form an angle potential, and a better terahertz spectrum measurement selection can be provided for many application scenes; and meanwhile, a novel terahertz time-resolved spectrum technology, a novel terahertz spectrum pumping detection technology and a novel terahertz spectrum imaging technology are expected to be created.

The application discloses a receiving antenna integrated with a low-impedance terahertz detector, which comprises a low-impedance terahertz detector located at the center, one crab claw-shaped metal sheet on each side, crab claw connecting arm metal sheets located between the terahertz detector and the two crab claw-shaped metal sheets and serving as connecting arms, and the overall structure is symmetric about the center. The application realizes effective integration of the on-chip low-impedance antenna and the low-impedance terahertz detector, realizes different working modes in different frequency bands, works in a resonant mode in a low frequency band and works in a traveling wave mode in a high frequency band, and realizes different working bandwidths in different frequency bands, that is, narrowband in the low frequency band and wideband in the high frequency band.

An existing terahertz detector is slow in response speed and narrow in response spectrum. The terahertz micro-cavity area array detector based on the bias plasma comprises a window and a photosensitive element, the photosensitive element comprises a first micro-cavity plate, a gas cavity layer and a second micro-cavity plate which are connected in sequence, the first micro-cavity plate is provided with a gas filling pipe, the gas filling pipe penetrates through the first micro-cavity plate, and the gas filling pipe is provided with a gas outlet. The gas filling pipe is communicated with the gas cavity layer, a discharge electrode is arranged on the second microcavity plate, the gas cavity layer is connected with a driving circuit through the discharge electrode, and the gas filling pipe is connected with a gas filling device. The terahertz detector has a spectral imaging function, adopts the principle that terahertz enters a gas cavity layer and the state of plasma changes, realizes detection of terahertz waves, can obtain information such as polarization and intensity of the terahertz waves, can solve the problems that an existing terahertz detector is low in response speed and narrow in response spectrum, is used for hidden target imaging, and has a wide application prospect.

The application discloses a terahertz Mueller matrix ellipsometer and a measuring method for a thin film sample, and belongs to the technical field of ellipsometric measurement. The application discloses a terahertz Mueller matrix ellipsometer, the included angle between the polarizing support and the vertical direction is θ0 degrees, the terahertz emission source, the first collimating lens, the first hollow rotating motor and the first focusing lens are sequentially arranged on the polarizing support and gradually close to the sample placing table, the second collimating lens, the second hollow rotating motor, the second focusing lens and the terahertz detector are sequentially arranged on the detecting support and gradually far away from the sample placing table, the first wave plate and the second wave plate are single-frequency quarter-wave plates and are respectively fixedly arranged in the corresponding hollow rotating motor, the signal acquisition and processing system records the light intensity signals received by the terahertz detector under different angles, and the Mueller matrix of the measured thin film sample is obtained according to the multiple sets of light intensity signal data, and the thickness and the refractive index of the measured thin film sample are obtained through inversion.

The application discloses a kind of field effect transistor terahertz detector chips of quadtree structure array, including chip substrate and field effect transistor terahertz detector array;Field effect transistor terahertz detector array is prepared on the surface of chip substrate using semiconductor technology, and is arranged in quadtree structure array on chip substrate;Field effect transistor terahertz detector is composed of field effect transistor and terahertz antenna, and the characteristic size of terahertz antenna is smaller and the center frequency is higher closer to the center position of field effect transistor terahertz detector array;The field effect transistor terahertz detector of different terahertz frequency band is integrated on a chip in the application, can realize the detection of wide-spectrum terahertz wave, solve the problem that the current field effect transistor terahertz detector detects narrow spectrum, and the array arrangement mode of quadtree structure can effectively reduce the area of chip, to reduce chip cost.

The invention discloses a terahertz detector and a preparation method thereof. The terahertz detector comprises a substrate; the TaNiTe5 layer is positioned on the substrate; the electrode is located on the substrate, and the electrode comprises a source electrode and a drain electrode which are electrically connected with the two ends of the TaNiTe5 layer respectively. According to the terahertz detector, the TaNiTe5 layer of the quasi-one-dimensional topological structure serves as the channel material layer of the terahertz detector, the unique double Dirac surface state and the quasi-one-dimensional structure of the TaNiTe5 layer can bring high carrier mobility, and effective detection of terahertz waves at the room temperature is achieved through a photoconductive response mechanism.

The application discloses a terahertz detector and a preparation method and application thereof, and the preparation method comprises the following steps: providing a first substrate; preparing a graphene layer on the first substrate; providing a second substrate; preparing an electrode structure on the second substrate, wherein the electrode structure comprises a source electrode and a drain electrode; and transferring the electrode structure from the second substrate to the first substrate by a transfer process, so that the source electrode and the drain electrode are electrically connected to two ends of the graphene layer, respectively. The terahertz detector is prepared in situ by using a low-energy van der Waals metal integration technology, the influence of the preparation of the electrode structure on the graphene layer is effectively avoided, the excellent intrinsic performance of the graphene layer is maintained, and the high-performance terahertz detector is obtained.

The present invention discloses a high-power terahertz difference-frequency resonant radiation source system, which relates to the field of terahertz application technology. The key technical solutions include: a 1064nm nanosecond laser, a first near-infrared beam delay line module, a near-infrared optical parametric oscillator, a second near-infrared beam delay line module, a near-infrared polarization-coupled prism, a terahertz diffraction resonant cavity module, a terahertz focusing lens, a terahertz detector, an oscilloscope, a precision motor control system, and a computer. The first near-infrared beam delay line module is located near the emitting end of the 1064nm nanosecond laser, and the second near-infrared beam delay line module is located near the emitting end of the near-infrared optical parametric oscillator. This radiation source system utilizes the significant wavelength difference between near-infrared and terahertz beams. By constructing a pair of diffractive optical elements outside a nonlinear crystal, the transmission behavior characteristics of the terahertz diffracted beam within the cavity are controlled, ultimately achieving terahertz echo resonant amplification.

The present invention relates to a terahertz flexible metamaterial spectral response detection device and a method for using the same. The detection device is arranged between a terahertz emitter and a terahertz detector of a terahertz optical system. The detection device specifically comprises a one-dimensional displacement platform and a T-shaped stage installed on a base; the T-shaped stage and the T-shaped clamping plate jointly clamp and fix the edge of the metamaterial via a second locking bolt; the one-dimensional displacement platform and the base are connected via a third locking bolt, and the upper end of the one-dimensional displacement platform and the platform clamping plate are clamped and fixed to the other end edge of the metamaterial via a first locking bolt; a hollow portion is provided below the installation position of the metamaterial to allow the transmission of terahertz waves. Application of this technical solution can realize flexible detection of metal aperture terahertz metamaterials.

The present application relates to a reconfigurable terahertz detector, a modulation method thereof, and an array unit. The reconfigurable terahertz detector includes a ferroelectric transistor comprising a substrate, a ferroelectric layer, a gate, a source electrode, and a drain electrode. The ferroelectric layer is located between the substrate and the gate electrode, and the polarization degree of the ferroelectric layer is adjusted based on a pulse voltage signal input to the gate electrode, so that the operating gate voltage of the reconfigurable terahertz detector is adjustable. An antenna is conductively connected to the source electrode and the gate electrode. Thus, the operating gate voltage of the reconfigurable terahertz detector is adjusted using the ferroelectric transistor, thereby improving application flexibility.

The invention belongs to the technical field of mercury ion detection, and particularly relates to a terahertz mercury ion detection device based on a microcavity and a use method thereof. The mercury ion detection device comprises a first objective table, a first substrate, a first graphene layer, a second objective table, a second substrate, a second graphene layer, a position adjusting device, a terahertz light source and a terahertz detector, the first substrate is fixed on the first objective table, and the second substrate is fixed on the second objective table; the first graphene layer and the second graphene layer are arranged on the opposite sides of the first substrate and the second substrate respectively, and the first graphene layer and the second graphene layer form a gap type microcavity structure; and the position adjusting device is fixedly connected with the second objective table and is used for changing the width of the microcavity. The advantages of structure regulation and control and spectrum detection are combined, the operation process is simple and convenient, the controllability is high, the detection sensitivity is high, and the advantages of high repeatability and stability are also achieved.

The present application relates to a kind of terahertz security check instrument of real-time panoramic terahertz imaging, 360° panoramic scene from object side emits terahertz electromagnetic wave, after reflection by panoramic terahertz optical system, enter transmission type terahertz imaging system and gather, image on terahertz detector focal plane, like circular ring distribution.Makes that terahertz imaging system need not rotate and can directly complete 360° panoramic ring view, obtains annular panoramic terahertz image.Then through image processing software mapping transformation, it is changed into the cylindrical surface unfolded image that conforms to daily visual habit from annular image, so that the range of 360° around it can be imaged in real time by single terahertz system.

This invention proposes a sensing device based on a folded continuous-domain bound-state all-dielectric crystal metasurface, comprising a terahertz emitter, an all-dielectric photonic crystal metasurface, and a terahertz receiver. The all-dielectric photonic crystal metasurface sensing device has a periodic aperture array structure on its surface, and in the x-direction, it forms a supercell periodic modulation structure through alternating large and small apertures, achieving Brillouin zone folding in the x-direction. When an incident terahertz pulse emitted by the terahertz emitter perpendicularly irradiates the all-dielectric photonic crystal metasurface, the transmitted terahertz pulse formed after interaction is received by the terahertz detector. When the all-dielectric photonic crystal metasurface is excited by a terahertz wave, the local electric field enhancement effect formed by the periodic aperture array structure at the edge and inside of its pores passively captures and enriches sample molecules of the tested solution sample in the hot spot region within the pores. This invention improves the detection sensitivity and operational convenience for trace samples.

This invention discloses a topological semi-metallic terahertz detector integrated with a butterfly antenna and its fabrication method. The device fabrication steps mainly involve mechanical lift-off, ultraviolet lithography, thermal evaporation coating, point transfer, and ultrasonic wire bonding to form the butterfly antenna-integrated topological semi-metallic terahertz detector. The device structure, from bottom to top, consists of: a first layer of intrinsic silicon substrate, a second layer of oxide layer, a third layer of topological semi-metallic nickel selenide telluride and butterfly antenna electrodes, and a fourth layer of topological semi-metallic graphene. By integrating the butterfly antenna and constructing a terahertz detector using a topological semi-metallic vertical heterojunction, the topological characteristics of the quantum states of the topological semi-metallic material can be tuned. The butterfly antenna can be used to focus the terahertz light field and improve the material's light absorption, ultimately achieving terahertz detection and imaging functions at room temperature. The advantages of this invention are fast detector response speed, self-driven operation at room temperature, low noise equivalent power, and ease of integration.

The application discloses a terahertz detector and an integrated preparation method thereof. The terahertz detector comprises a planar circularly polarized helical antenna integrated with a field effect transistor device, the planar circularly polarized helical antenna is used for simultaneously receiving two mutually orthogonal electric field components and forming a rotating electric field with a phase difference of 90 DEG; the planar circularly polarized helical antenna has a first feeding end and a second feeding end, the first feeding end is electrically connected with one electrode of the field effect transistor device, and the second feeding end is electrically connected with another electrode of the field effect transistor device, so as to couple the received terahertz signal to a two-dimensional electron gas channel. The planar circularly polarized helical antenna is adopted, different polarized direction terahertz electromagnetic waves are effectively received, the adaptability of the detector to the polarization state change of the terahertz wave is improved, and the response stability and receiving efficiency of the detector in the actual application scene are improved; the helical antenna is integrated with the field effect transistor device, and the terahertz signal coupling efficiency is improved.

The invention discloses a detection device based on a terahertz time-domain spectroscopy technology, and relates to the technical field of detection equipment. The device comprises a box body, a femtosecond laser, a terahertz pulse device and a terahertz detector, three parallel detection chambers are arranged on the left side of the box body, a terahertz pulse generation chamber is arranged on the right side of the box body, a terahertz detector facing the light-transmitting square hole is arranged in the detector chamber, a femtosecond laser is arranged at the bottom of the terahertz pulse generation chamber, a time delay device is arranged above the femtosecond laser, and a light-transmitting square hole is formed in the box body. And the femtosecond laser emitted from the time delay device enters the terahertz pulse device. The three detection chambers are arranged to detect solid state, liquid state and gas state, and the problems that an existing instrument is troublesome in switching when detecting substances in three states, the precision is prone to being affected by air in the detection chambers and the like are solved.

The present application relates to a kind of liquid enhanced sensing system and measurement method based on bow-tie type metal aperture terahertz metamaterials.The system includes terahertz transmitter, sensing device, terahertz detector and post-processing system.The sensing device is composed of bow-tie type metal aperture terahertz metamaterials and liquid sample cell.Terahertz transmitter and terahertz detector are respectively arranged above and below the sensing device for transmitting and receiving terahertz signals.The post-processing system is connected with the terahertz detector to process and display the received terahertz signals in real time.The measurement method of the system is as follows: detecting the terahertz signal of empty liquid sample cell, detecting the terahertz signal of bow-tie type metal aperture terahertz metamaterials with different configurations without loading or loading liquid sample to be measured, and calculating the sensitivity of bow-tie type metal aperture terahertz metamaterials with different configurations.The system is easy to operate, has excellent performance, high sensing sensitivity, and can support terahertz sensing detection of different liquids.