32 results about "Thz waves" patented technology

The invention provides a terahertz horn antenna and a preparation method thereof, and relates to the technical field of mobile communication systems. The antenna layer is arranged to be the antenna layer with the horn antenna groove structure, and due to the advantages of the horn antenna, the terahertz horn antenna has the advantages of being simple in structure, convenient to control gain, excellent in frequency characteristic, small in loss and the like. Moreover, the antenna layer and the radio frequency layer provided by the invention are fixed through bonding of the radiation electrode and the metal film, so that a low-reflection interconnection channel is realized, THz waves can be limited in a bonding area, the problem of electromagnetic leakage caused by stacking of the antenna layer and the radio frequency layer is avoided, and the performance of the terahertz horn antenna is improved. According to the terahertz horn antenna, the antenna layer and the radio frequency layer both adopt the glass substrates, the glass substrates have the advantages of high mechanical strength, small dielectric loss and the like, and the glass substrates can bear higher temperature, so that the problems of warping and deformation of the substrates are reduced, and the preparation quality of the terahertz horn antenna can be improved.

The invention discloses a preparation method of a high-sensitivity terahertz metasurface dual-mode sensor, and belongs to the field of terahertz biochemical sensing. The terahertz metasurface sensor is prepared in the mode that the dielectric layer is firstly patterned and then overall coating is conducted, the liquid thickness can be accurately controlled to be in the micron order through the patterned dielectric layer, when a biological sample solution is detected, THz wave absorption is reduced by reducing the amount of liquid to be detected, and the detection accuracy is improved. Therefore, the test problem caused by THz wave strong absorption of the polar liquid to be tested is solved to a certain extent; meanwhile, due to the design of the graphical dielectric layer, the volume of an overlapped area of the sample and strong field energy is increased, the terahertz wave-substance interaction is greatly enhanced, and higher device sensitivity is achieved. In addition, the dual-mode sensor prepared by the method can generate perfect absorption peaks of two modes at the same time under oblique incidence excitation of terahertz waves, and the two modes have good angle robustness and high performance under excitation of TE / TM waves.

The invention relates to a terahertz near-field imaging light path calibration device and a terahertz near-field imaging light path calibration method. The device comprises a first visible light source, a second visible light source, a first collimation visible light source, a second collimation visible light source, a first light path collimation system, a second light path collimation system, a light path adjusting system, a circular reflector, a terahertz quantum cascade laser, a thermal detection array, a terahertz quantum well detector and an atomic force microscope platform. The THz laser source and the detector are simulated through the divergent visible light source, the lifting position point of the light path is calculated, light beams can be accurately coupled to the position of the needle point after being focused, errors caused by improper light path adjustment are reduced, meanwhile, the overlapping effect of light spots at the needle point is calibrated through the circular reflector and the thermal detection array, and the detection accuracy is improved. And the thermal detection array is used for observing the convergence effect of THz reflection light spots at the position of the detector, so that the effective focusing and coupling efficiency of THz waves in a near-field region of a probe sample can be improved.

The invention relates to the technical field of multifunctional composite materials, and discloses composite hydrogel with a two-stage pore structure as well as a preparation method and application of the composite hydrogel. The composite hydrogel with the two-stage pore structure is prepared by carrying out synergistic pre-assembly on liquid metal nanoparticles and MXene nanosheets and then carrying out in-situ polymerization with an acrylic monomer; a two-stage pore structure which is formed in situ in one step through polymerization heat release is arranged in the porous material. In the hydrogel disclosed by the invention, the liquid metal exerts multiple functions of hydrophobic modification, pore forming and electric conduction, and generates a synergistic enhancement effect of '1 + 1gt, 2' with the MXene; through the synergistic effect of a hydrophobic area introduced by the liquid metal and a two-stage pore structure, the swelling resistance of the hydrogel is fundamentally improved, so that the hydrogel can adapt to harsh water environments and chemical environments. Based on the synergistic effect, the composite hydrogel with the two-stage pore structure has excellent broadband electromagnetic shielding performance (covering GHz and THz wave bands), infrared thermal camouflage capability, ultraviolet shielding function and long-term anti-swelling stability in a harsh liquid phase environment.

The invention belongs to the technical field of photon detection, and particularly relates to a frequency up-conversion THz wave-based multi-photon detection system and method, and the system comprises a pump light source unit, a beam combiner, a nonlinear crystal, a light splitting unit, a space photon counting detector, a light shaping device, and a controller. According to the technology, THz up-conversion signals are converted from single time domain detection to time and space domain coincidence detection, meanwhile, by means of the spatial resolving power of the multi-photon detector, when time-synchronous fluorescence is achieved, the technology can be combined with the space light gate technology to execute detection in a light gate where the signals are expected to arrive, and therefore fluorescence components are restrained. Finally, effective detection of THz up-conversion signals with spontaneous parametric up-conversion fluorescence can be realized.

A device for generating a radio frequency (RF) beam includes an array of independent unit cells. Each unit cell includes RF sources configured to generate terahertz (THz) signals, and antennas coupled to the RF sources for transmitting THz waves based on the THz signals. The device further includes switches configured to selectively bias each unit cell between an activated state in which the antennas of the unit cell are operable to transmit the THz waves, and a deactivated state in which the antennas of the unit cell are prevented from transmitting the THz waves. The device further includes circuitry configured to control the switches to generate the RF beam based on the THz waves transmitted by the antennas of each unit cell in the activated state.

The invention relates to a cross-wavelength response integrated biosensor which comprises a plurality of periodic units, and each periodic unit comprises a substrate layer, a dielectric layer and a metal layer which are sequentially arranged from top to bottom; the metal layer comprises a plurality of metal structure units, each metal structure unit comprises a metal wire and two discrete metal split rings, and the metal wire and the metal split rings are formed by nano particle arrays. According to the invention, a plurality of independent sensors are not needed, and high-sensitivity sensing response of the THz wave band and the optical wave band can be realized only by a single integrated structure; in a single sensor, high-sensitivity detection of biomolecules from small to sub-nanometer scale and from large to micron scale can be realized at the same time; on the microscopic scale, the THz resonance sensitivity of the sensor can reach 63.9 GHz / RIU; on the nanoscale, when the incident wavelength is 785 nm, the SERS enhancement factor of the sensor is 8.8 * 10 < 4 >; the response performance of the biosensor can be realized by optimizing the structural parameters, geometrical shapes, unit arrangement and the like of the metal layer.

The present application belongs to the field of electromagnetic shielding materials, and specifically provides a transparent and stretchable hydrogel-based terahertz shielding material and a preparation method thereof, to solve the problems of low visible light transmittance and low mechanical ductility of existing terahertz shielding materials. In the present application, the terahertz shielding material is a hydrogel composed of a three-dimensional polymer network and a polar solution, the polar solution is a mixture of pure water and a polar organic solvent, the polar organic solvent is one of ethanol, ethylene glycol, glycerol and sorbitol, and the volume ratio of pure water to polar organic solvent is 1:1. The hydrogel-based terahertz shielding material provided by the present application has excellent terahertz wave shielding performance, and the shielding efficiency can reach more than 40 dB in the 0.5-4.5 THz wave band, and has excellent visible light transparency and mechanical stretching performance. Meanwhile, the present application provides a preparation method of the hydrogel-based terahertz shielding material, which adopts a chemical polymerization method, and has the advantages of simple preparation process and low preparation cost.

The application aims to provide a kind of optimized cascade difference frequency terahertz wave radiation source, which can enhance the intensity of terahertz wave and improve the energy conversion efficiency of terahertz wave.Compared with the traditional cascade difference frequency needing two pump sources, the scheme only needs one pump source, the polarization period of AFB-KTP crystal determines the wavelength of generated signal light and idler light, and through the setting of the polarization period of AFB-KTP crystal, the purpose of different frequency THz wave tuning is achieved.Through the setting of the non-polarization period of APPLN crystal, the signal light photon is repeatedly transferred to high-order Stokes light photon, and the conversion efficiency of terahertz wave is improved.

Methods and systems for dry eye analysis using terahertz (THz) radiation. The method includes projecting a THz wave onto a surface of an eye and detecting a reflected wave being a reflection of the THz wave reflected from the surface of the eye. The method further includes analysing properties of the eye in response to the THz wave reflected from the surface of the eye, the properties of the eye including thickness of the eye's cornea and ambient tissues, and analyzing the properties of the eye comprises measuring the thickness of the cornea and / or the ambient tissues and / or measuring an amount of chemical components of one or more of the eye's layers.

An UC dielectric waveguide of the embodiments includes: a dielectric substance wiring propagating a terahertz wave; and a medium disposed around the dielectric substance wiring and having a large refractive index difference with respect to the dielectric substance wiring. A THz circuit of the embodiments includes a dielectric substance THz circuit connected between a first and second UC dielectric waveguides. The dielectric substance THZ circuit includes a circuit including a linear-shaped UC dielectric waveguide, a bent-shaped UC dielectric waveguide, and a Y-coupled branch circuit. There are included a first holding unit holding the first UC dielectric waveguide and a second holding unit holding the second UC dielectric waveguide. The THZ circuit of the embodiments may include a 2×2 evanescent coupler. Provided is a THz circuit having mechanical strength obtained by applying the UC dielectric waveguide having high confinement and transmission efficiencies of THz waves with a simple structure.

The present application provides a terahertz horn antenna and a preparation method thereof, and relates to the technical field of mobile communication systems. The antenna layer is set as an antenna layer with a horn antenna groove structure. Due to the advantages of the horn antenna itself, the terahertz horn antenna has the advantages of simple structure, easy gain control, excellent frequency characteristics, low loss, etc. In addition, the antenna layer and the radio frequency layer provided by the present application are fixed by bonding with the radiation electrode and the metal film, which not only realizes a low-reflection interconnection channel, but also can confine the THz wave within the bonding area, avoiding the problem of electromagnetic leakage caused by the stacking of the antenna layer and the radio frequency layer, and improving the performance of the terahertz horn antenna. The present application provides that both the antenna layer and the radio frequency layer adopt a glass substrate. The glass substrate has the advantages of high mechanical strength and low dielectric loss, and the glass substrate can withstand higher temperatures, thereby reducing the problem of substrate warping and deformation, and thus can improve the preparation quality of the terahertz horn antenna.

The invention discloses a dynamic phase reconstruction technology of a patterned terahertz (THz) liquid crystal transparent electrode, and belongs to the technical field of terahertz application. The specific implementation method is as follows: the PVA-graphene conductive THz transparent film is prepared by utilizing the strong adhesive force of polyvinyl alcohol (PVA) and combining the high transmittance, high carrier mobility and excellent chemical stability of graphene at the THz wave band. And then, processing the thin film by adopting an ultraviolet laser etching technology to manufacture a micro-structure patterned electrode. Furthermore, the patterned graphene transparent film positive electrode layer, the liquid crystal layer and the graphene transparent film negative electrode layer are combined, and sub-wavelength pixelated liquid crystal spatial light phase regulation is achieved. According to the technology, the THz light field phase distribution of the liquid crystal can be spatially coded by patterning the terahertz liquid crystal transparent electrode array, and the regulation of a single pixel element is expanded from a simple on-off state to multi-level state regulation under different voltages. According to the invention, a technical foundation is laid for research and development of a high-performance terahertz spatial light modulator, and development of the fields of terahertz spatial light information processing, holographic technology and the like is expected to be promoted.

The application discloses a digital light-controlled coded THz reflection array based on PB phase, and belongs to the field of electromagnetic wave front control, and aims at solving the problem that the independent control of each array element of the THz coded reflection array by the electric control means is hindered in the prior art; in the application, the reflection array is formed by the periodic arrangement of composite microstructure array elements in a two-dimensional plane; the composite microstructure array element comprises a substrate, a metal microstructure and a VO2 microstructure; the metal microstructure comprises a rectangular metal structure and a metal ring, the rectangular metal structure is provided with a circular hole, and the metal ring is located in the circular hole; the VO2 microstructure comprises left VO2 microstructure and right VO2 microstructure which are nested between the metal ring and the circular hole, and the included angles between the symmetry axes of the x-y plane and the x axis are +45° and -45° respectively; the composite microstructure array element of the application controls the THz wave based on the PB phase, the amplitudes in two states are completely the same in the working frequency band, the phase difference is always 180°, and the THz wave can be stably and widely controlled.

The application discloses a graphene-VO2-based terahertz ultra-wideband adjustable wave absorber and belongs to the technical field of terahertz technology, comprising, from top to bottom, a phase change material layer, a first dielectric layer, a graphene layer, a second dielectric layer and a reflection layer; the phase change material layer comprises a plurality of periodically arrayed VO2 umbrella-shaped patches; each VO2 umbrella-shaped patch is a regular octagon structure composed of eight congruent isosceles triangles; there are gaps between adjacent isosceles triangles; and adjacent VO2 umbrella-shaped patches are not connected with each other. The umbrella-shaped VO2 patches arranged in an array are combined with the graphene layer to realize ultra-wideband wave absorption in a 3-10 THz wave band, and the absorption rate is kept above 90%; and by respectively controlling the conductivity of the phase change material layer and the Fermi level of the graphene layer, the wave absorber presents different working states and has the characteristics of functional diversity.

The invention relates to a preparation method of a terahertz wave absorbing device and the terahertz wave absorbing device. The method comprises the following steps: growing an absorption layer on a first temporary substrate to form a functional structure body; carrying out structured processing on the functional structure body, and forming an array structure on the absorption layer; connecting the functional structure body after the structural processing with the second temporary substrate, and stripping the first temporary substrate; forming an initial laminated structure body; connecting the functional structure body after the substrate is peeled off with the initial laminated structure body to obtain a target laminated structure body; and stripping the second temporary substrate and the third temporary substrate from the target laminated structure body to obtain the terahertz wave absorbing device. The terahertz wave absorbing device comprises a flexible substrate layer, a metal reflecting layer, a flexible coating layer and an absorbing layer. By adopting the method to construct the full-flexible laminated structure, the THz wave-absorbing device can be tightly attached to the surface of the curved surface, stable performance is kept under stretching and bending deformation, and the mechanical adaptability of the THz wave-absorbing device is improved.

This invention discloses a coupled microstrip antenna element, a determination method thereof, and a coupled antenna photoconductive detector, relating to the field of terahertz technology. The antenna element mainly comprises: an I-shaped antenna and two microstrip antennas with identical structural parameters; an opening is provided at the center of the middle arm of the I-shaped antenna; the two microstrip antennas are symmetrically placed on both sides of the middle arm; the microstrip antenna includes multiple groove structures, with the opening of each groove structure facing the middle arm; the structural parameters of the microstrip antenna include at least the number of groove structures, the groove period, the groove width, and the groove depth; through the resonant coupling effect between the microstrip antenna and the I-shaped antenna, the incident THz wave is localized to the central opening of the I-shaped antenna, enhancing the local electric field strength of the THz wave, thereby improving the detection sensitivity of the coupled antenna photoconductive detector.

One embodiment includes a terahertz (THz) optoelectronic device configured to generate and detect THz waves at frequencies ranging from 40 GHz to 10 THz through photomixing when illuminated with an optical beam with more than one wavelength is provided. The device comprises a substrate composed of quantum well layers embedded in an intrinsic region of a PIN photodiode.

This invention disrupts a phase of an incident THz wave. An embodiment of the present disclosure provides a terahertz wave diffuser 100 comprising a dispersion medium 2 and a particulate dispersoid 10. The dispersion medium transmits the incident terahertz wave. The particulate dispersoid is made up of particles 1 each comprising a microstructure and a material responding to the incident terahertz wave, and is supported by being dispersed in the dispersion medium. The present disclosure also provides a method for manufacturing the terahertz wave diffuser.

The invention relates to the technical field of electromagnetic shielding materials, and discloses a fiber material for shielding terahertz waves and a preparation method and application thereof. The fiber material for shielding the terahertz waves is of a coaxial core-shell structure, a core layer is made of a two-dimensional layered material, and a shell layer is made of nanocellulose; the two-dimensional layered material comprises Ti < 3 > C < 2 > T < x > MXene or reduced graphene oxide. According to the fiber material for shielding the terahertz waves, a two-dimensional layered material serves as a core layer, a nanocellulose shell layer framework is wrapped, and a two-dimensional layered material and nanocellulose coaxial fiber is formed. The fiber material for shielding terahertz waves prepared by the invention not only has excellent electromagnetic shielding performance, effective shielding bandwidth can cover a 0.1-1.5 THz wave band, the average shielding effectiveness in the wave band can reach 47.61 dB, but also has excellent mechanical properties, the tensile strength can reach 161.6 MPa, and the elongation at break can reach 5%.

The invention provides a terahertz source radiation intensity far-field measurement device and method and a method for debugging an optical path. The device belongs to the field of optical measurement and metering and comprises a terahertz emission system, a terahertz attenuation system, a terahertz detection system, an extension adapter plate and a computer. And the far-field distribution test of the radiation intensity of the terahertz source with the output power greater than 1mW in the (0.1-10) THz wave band range can be realized. The measurement method comprises the following steps: recording the terahertz radiation power measured by the terahertz power meter as Pm, the diameter of the adjusting diaphragm as D, the transmittance of the terahertz attenuator as tau1, the transmittance of the terahertz narrow-band filter as tau2, the reflectivity of each wedge-shaped reflector as R, the number of the wedge-shaped reflectors being n, and the Terahertz radiation power measured by the Terahertz power meter as Pm, the diameter of the adjusting diaphragm as D, the transmittance of the Terahertz attenuator as tau1 and the transmittance of the Terahertz narrow-band filter as tau2, and the reflectivity of each wedge-shaped reflector as R; the distance between the measured terahertz radiator and the variable diaphragm is recorded as L, and the radiation intensity value of the measured terahertz radiator is calculated by using a formula. And accurate magnitude of a far-field measurement terahertz source radiation result can be ensured.

Methods and systems for analysing a property of a cornea of an eye using terahertz (THz) radiation are provided. The method includes projecting a first THz wave onto a surface of the cornea and detecting a first reflected wave being a reflection of the first THz wave reflected from the surface of the cornea. The method further includes deforming the cornea, projecting a second THz wave onto the surface of the cornea after the deforming and detecting a second reflected wave being a reflection of the second THz wave reflected from the surface of the cornea after the deforming. Finally, the method includes calculating the property of the cornea based on the first reflected wave and the second reflected wave.

A test device, a test method, and a test system for treating AD are provided. The test device for AD includes: a THz wave generator, used for generating THz wave; a headgear, connected to the THz wave generator via an optical fiber, is utilized for precise irradiation of the THz wave to a specific brain region in the experimental animals. The test device solves the defect that there is still no effective treatment for cognitive dysfunction diseases such as AD and VD, and it can provide a new idea for the treatment of AD through the THz irradiation test.

A device for generating a radio frequency (RF) beam includes an array of independent unit cells. Each unit cell includes RF sources configured to generate terahertz (THz) signals, and antennas coupled to the RF sources for transmitting THz waves based on the THz signals. The device further includes switches configured to selectively bias each unit cell between an activated state in which the antennas of the unit cell are operable to transmit the THz waves, and a deactivated state in which the antennas of the unit cell are prevented from transmitting the THz waves. The device further includes circuitry configured to control the switches to generate the RF beam based on the THz waves transmitted by the antennas of each unit cell in the activated state.

The invention discloses a THz full-band space imaging system based on a space resolution layer and a superconducting microwave dynamic inductance detector array imaging chip, and belongs to the field of signal detection. The system comprises an MKID detector array module, a spatial resolution layer module, a microwave signal coupling and amplification module, a signal mixing and acquisition module, an image reconstruction and processing module, a THz wave source and calibration module, a low-temperature superconducting module and a microwave signal source and excitation module. Through the design of the MKID detector array, full-band detection of terahertz waves can be realized, and the sensitivity and accuracy of the detection system are greatly improved. By introducing the spatial resolution layer, spatial information is converted into a time domain signal, so that spatial imaging of terahertz waves is realized, and the spatial resolution of the system is improved. And by adopting a digital acquisition system and a rapid signal processing algorithm, real-time acquisition and analysis of signals can be realized, and the real-time performance of the system is further improved.

The invention discloses a graphene terahertz metasurface sensor and application thereof in pesticide residue detection, and relates to the technical field of sensors and detection. The graphene terahertz metasurface sensor comprises a substrate, a metasurface layer, a graphene film and an aptamer layer. The invention further provides application of the graphene terahertz metasurface sensor in pesticide residue detection. The metasurface layer is composed of the asymmetric metal wire array, the metasurface layer is placed in a light path of a transmission-type THz time-domain spectroscopy system, under the condition that the polarization direction of incident waves is along the x axis, the structure can generate extremely strong local electric field enhancement, and when the metasurface layer is used for detecting pesticide molecules, the detection sensitivity is greatly improved. The interaction between THz waves and pesticide molecules to be detected is obviously enhanced, so that the purpose of trace sensing of a target object is achieved. In addition, graphene is utilized and the metasurface of the aptamer layer is modified, so that the detection sensitivity and specificity are improved.

The invention belongs to the technical field of terahertz time-domain spectroscopy substance identification, and particularly relates to a hybrid cascade THz signal processing method based on Booth-CIC phase discrimination optimization. The analog-digital hybrid cascade design is adopted, the high-speed analog micro-current amplifier and the FPGA multi-channel digital phase-locked amplification system based on Booth-CIC cascade are specifically included, the detectability of weak signals is remarkably improved, the phase discrimination precision is optimized, and the dynamic reserve of the signals is improved. Compared with traditional ultrasonic and thermal imaging detection, the method has remarkable advantages in the aspects of data processing and real-time monitoring, interaction between THz waves and substances is rapidly captured in real time by utilizing a THz nondestructive testing technology, and efficient evaluation of the internal structure and characteristics of the material is achieved. Therefore, high-speed, high-precision and high-dynamic-range processing of the THz signals is realized, and high-speed development of the THz signals in the field of nondestructive testing is promoted.

The invention belongs to the field of wave-absorbing materials, and discloses a terahertz wave-absorbing fabric and a preparation method thereof. The terahertz wave-absorbing fabric comprises a conductive fiber porous array layer, a middle dielectric layer and a dense conductive cloth layer, the middle dielectric layer is arranged on one side of the conductive cloth layer; and the conductive fiber porous array layer is arranged on one side, far away from the conductive cloth layer, of the dielectric layer to form a three-layer composite wave-absorbing structure. According to the terahertz wave-absorbing fabric, the middle dielectric layer arranged on one side of the conductive cloth layer and the conductive fiber porous array layer arranged on the side, away from the conductive cloth layer, of the middle dielectric layer form a three-layer composite wave-absorbing structure, so that broadband, efficient and flexible wave absorption of the 0.1-2 THz wave band is achieved; the application requirements of wearing, stealth protection, electromagnetic compatibility and the like are met, and the absorptivity in a 50% frequency band reaches 0.9; and the fabric is distinct in structural hierarchy, easy to prepare, simple in structure and low in cost, and can be realized by utilizing a textile technology.

The invention belongs to the technical field of photon detection, and particularly relates to a THz photon counting detection system based on cascade frequency up-conversion, which comprises a first pump light source, a second pump light source, a first beam combiner, a first nonlinear crystal, a light splitting unit, a second beam combiner, a second nonlinear crystal, a light shaping device, a space photon counting detector, a time gating and a space gating. The first nonlinear crystal upconverts THz wave frequency into a near-infrared light signal and generates spontaneous parametric upconversion fluorescence noise consistent with time, space and spectrum characteristics of the signal, and the signal and the noise are mixed, so that the unit type SPD fails. According to the technology, the cascade frequency of a near-infrared signal is up-converted to visible light, signal-noise photons are spatially separated through a light shaping device, and photon counting detection of the signal is realized by combining a space photon counting detector with a mature visible light wave band with space-time coincidence measurement, so that room-temperature photon counting detection of THz waves is realized.