82 results about "Terahertz metamaterials" patented technology

The invention discloses a high-sensitivity carbendazim detection method based on terahertz metamaterial resonance enhancement, and provides a terahertz metamaterial sensor with a cross-shaped composite double-peak structure, a terahertz spectrum technology is utilized to collect transmission spectrums, the difference of different concentrations among terahertz spectrums is explored, and the detection accuracy is improved. The analysis finds that the transmission peak amplitude of the terahertz transmission spectrum of the structure is in a decreasing trend along with the increase of the concentration of a carbendazim solution, data is preprocessed through multiple scatter correction (MSC), feature extraction is performed by adopting an iterative information variable reservation (IRIV) method, and a quantitative detection model of the carbendazim terahertz transmission spectrum is established based on an LS-SVM (least squares support vector machine). The invention provides a novel approach for quantitative detection of carbendazim, and experimental results show that the RP of the model reaches 0.9825, the RMSEP is 0.2001, and the detection limit LOD is 0.672 mu g / ml. The invention provides a new method for rapid, lossless and high-sensitivity detection of carbendazim in food.

The invention belongs to the technical field of terahertz detection, and discloses a terahertz metamaterial enhanced spectrum detection system. Comprising the following steps: constructing a metamaterial enhancement factor tensor matrix according to the interaction between terahertz waves and a metamaterial; performing local field enhancement and surface plasma resonance optimization on the target sample based on the metamaterial enhancement factor tensor matrix to obtain a feature enhancement spectroscopy mapping function; constructing a multi-dimensional detection feature space based on a feature enhancement spectroscopy mapping function; a spectral signal enhancement topology network is formed based on the multi-dimensional detection feature space; enhancing the topological network based on the spectral signal, and generating an enhanced spectral feature discrimination function; obtaining a high-precision terahertz spectrum detection result based on the enhanced spectrum characteristic discrimination function; according to the invention, internal correlation between spectral characteristics can be mined, and comprehensive description of sample information is enhanced, so that high-precision terahertz spectrum detection is realized.

The invention discloses a terahertz amplitude-frequency-adjustable narrow-band absorber based on photosensitive silicon and a strontium titanate material, and relates to the technical field of terahertz metamaterial absorber application. The structure mainly comprises a gold substrate, a strontium titanate dielectric layer and a composite resonant structure array at the top. According to the invention, tunable materials of photosensitive silicon and strontium titanate are used, and the conductivity of the photosensitive silicon is changed by controlling the intensity of an external pump light source, so that the amplitude of an absorption frequency point is regulated and controlled; the dielectric constant of strontium titanate is changed by controlling the external temperature, and the frequency of an absorption frequency point is regulated and controlled, so that the effect of independent, continuous and modulatable amplitude-frequency is achieved. The terahertz function logic device has the advantages of being simple in structural design, flexible, tunable, high in functionality and the like, and a new thought can be provided for design of the terahertz function logic device.

The invention relates to the technical field of terahertz metamaterial devices, in particular to an ultra wide band / double narrow band switchable terahertz wave absorber based on vanadium dioxide and sensing application. The wave absorber is formed by periodically arranging and combining a plurality of metamaterial square structure units, and no gap exists between adjacent periodic units. Each metamaterial square structure unit is composed of six layers from top to bottom, namely a VO2 resonance layer, a photonic crystal plate dielectric layer, a VO2 thin film, a metal resonance layer, a polycrystalline silicon dielectric layer and a gold substrate. The reversible phase change process of vanadium dioxide from a metal state to an insulation state is realized through external excitation (light, temperature and voltage). When vanadium dioxide is in a metal state, the terahertz ultra-bandwidth absorption function is achieved, when vanadium dioxide is in an insulated state, the terahertz wave double-narrow-band absorption function is achieved, and conversion between the ultra-wide band and the double narrow bands of the wave absorber is achieved. According to the terahertz wave absorber, the ultra-wideband / dual-narrowband conversion function of terahertz wave absorption can be achieved on one device, the defects that an existing terahertz wave absorber is complex in structure and the absorption characteristic is fixed once the terahertz wave absorber is manufactured are overcome, and the sensing function application of a single narrowband in the terahertz wave absorber is researched.

The invention discloses a terahertz metamaterial sensing device and a blood glucose concentration detection method, and belongs to the field of terahertz science and technology. The terahertz metamaterial sensing device comprises an upper-layer asymmetric arc-shaped silicon column array and a lower-layer silicon substrate; the asymmetric arc-shaped silicon column array is composed of a plurality of arc-shaped silicon column unit structures with one long arc-shaped silicon column unit structure and one short arc-shaped silicon column unit structure. The long arc-shaped silicon column and the short arc-shaped silicon column have the same circle center and radius, and the arc length of the long arc-shaped silicon column is longer than that of the short arc-shaped silicon column; 3-aminopropyltriethoxysilane and glucose oxidase are used for carrying out surface functional modification on the asymmetric arc-shaped silicon column array and the silicon substrate. The device can be used for sensing and detecting blood glucose in a clinical serum sample, the concentration information of the blood glucose in the sample is obtained through the frequency shift of the resonance peak of the device, and the real-time, label-free and nondestructive detection of the sample is realized while the detection sensitivity is improved.

The invention discloses an analysis method for detecting the correlation of moxa quality based on a terahertz metamaterial sensor, and the method comprises the steps: optimizing the structural design and simulation of a polarization-dependent and polarization-independent metamaterial sensor through the CST Studio # imgabs0 # 2019 software by utilizing the resonance characteristic of a metamaterial and an equivalent circuit theoretical model, and determining the resonance peak frequency of the metamaterial sensor. According to the method, the influence of analytes with different thicknesses and refractive indexes on the harmonic peak frequency shift of the sensor is simulated and analyzed, and the relationship between the moxa sample quality and the harmonic peak frequency shift is researched. Compared with a traditional terahertz detection technology, the accuracy and the sensitivity are remarkably improved by combining the designed metamaterial sensor, the sample detection amount is greatly reduced to 60 micrograms from 5 milligrams, and efficient detection of trace moxa is achieved. The innovative scheme provides efficient and accurate technical support for traditional Chinese medicine quality monitoring, and has important practical application value.

The invention discloses an aflatoxin B1 detection method based on a BIC terahertz metamaterial sensor, and designs a continuous domain bound state (BIC) terahertz metamaterial sensor based on an electromagnetic theory and a time domain finite difference method. Terahertz enhanced spectrums of aflatoxin B1 solutions with different concentrations are collected, and analysis finds that the amplitude of a transmission peak of aflatoxin B1 at about 1.5 THz is gradually reduced along with the increase of the concentration of the aflatoxin B1 solution, and the frequency of the transmission peak gradually moves to a low frequency along with the increase of the concentration of the aflatoxin B1 solution; a PLS and LS-SVM quantitative model of aflatoxin is established, analysis finds that the LS-SVM model has a better effect, and the detection limit of aflatoxin B1 is 2.04 * 10 <-7 > mu g / ml. By adopting the method disclosed by the invention, rapid, nondestructive and high-sensitivity detection of the aflatoxin B1 in the grains can be realized.

The application discloses a flexible terahertz metamaterial sensor and a preparation method thereof, which comprises, from top to bottom, a reinforcing layer, a carbon nanotube film layer and a polymer substrate layer; the reinforcing layer is composed of a graphene and zinc oxide composite material; the reinforcing layer and the carbon nanotube film layer are consistent in shape and are both periodic strip structures. The super material sensor is based on the synergistic effect of a ternary system of zinc oxide / graphene / carbon nanotube, wherein zinc oxide nanoparticles grow directionally on a graphene sheet through a Zn-O-C bond, and a carbon nanotube film constructs a three-dimensional conductive network, thus solving the dielectric loss problem of a traditional noble metal-based sensor structure. The phonon resonance characteristics of zinc oxide are coupled with graphene plasmons, a high-efficiency charge transfer channel is formed at a heterojunction interface, and the conductivity and terahertz transmission efficiency are improved.

This invention provides a heterojunction terahertz metamaterial sensor and its fabrication method. The sensor comprises: a silicon dioxide substrate, and a polyimide flexible dielectric layer, a metal array layer, a graphene layer, and a carbon nitride layer sequentially located on the silicon dioxide substrate; wherein the metal array layer has multiple metal periodic structural units; the metal periodic structural units are used to resonate with terahertz waves. By setting metal periodic structural units that resonate with terahertz waves in the metal array layer, this invention can change the surface dielectric environment of the metal array layer, thereby altering the resonant frequency and transmission amplitude involved in the terahertz band, and thus achieving ultrasensitive, multi-dimensional detection of proteins.

The application discloses an ultrahigh-sensitivity terahertz metamaterial sensor device and a preparation method, and belongs to the technical field of terahertz metamaterial biochemical sensing. The structure comprises: a plasmonic gold film substrate and a metamaterial pattern structure. The metamaterial pattern structure is deposited on the surface of the plasmonic gold film substrate, and a unit cell thereof is composed of a vertical split resonator and a horizontal intermediate connector. The vertical split resonator is composed of two gold square column resonators, and the intermediate connector is composed of a two-dimensional material graphene nanosheet. Under the vertical incidence excitation of TM terahertz waves, the vertical split resonator and the horizontal intermediate connector can realize high-intensity electric field coupling, and output ultrahigh detection sensitivity and high quality factor. The application has the advantages of simple structure and easy preparation, and provides detection sensitivity in the THz / RIU order, which is much higher than the performance of current terahertz sensor devices, and can effectively solve the practical problems of the current terahertz sensor devices, such as complex structure, poor detection sensitivity and low quality factor.

The invention provides a terahertz metamaterial resonance enhanced trace thiabendazole detection method and system, and the method comprises the steps: constructing parameter information of a metamaterial sensor based on a single periodic structure and the characteristic peak frequency of thiabendazole, and carrying out modeling simulation according to the parameter information to obtain a terahertz metamaterial with an L-shaped composite double-peak structure; preparing a thiabendazole sample, and performing spectrum acquisition on the thiabendazole sample by using a terahertz metamaterial to obtain corresponding spectrum data; constructing a support vector regression model, fusing a weighted vector average optimization algorithm, and performing hyper-parameter global optimization to construct a corresponding optimization model; and constructing a corresponding detection model according to the spectral data and the optimization model, and realizing nondestructive detection of trace thiabendazole by using the detection model. According to the method, high-sensitivity quantitative analysis on trace amount of thiabendazole residues is realized, and the feasibility and superiority of the INFO optimization algorithm in the field of spectrum detection are also verified.

This invention discloses a highly sensitive detection method for carbendazim based on terahertz metamaterial resonance enhancement. The invention proposes a terahertz metamaterial sensor with a "+" shaped composite double-peak structure. Transmission spectra were acquired using terahertz spectroscopy, and the differences in terahertz spectra at different concentrations were investigated. Analysis revealed that the amplitude of the transmission peak in the terahertz transmission spectrum of this structure decreases with increasing carbendazim solution concentration. Data preprocessing was performed using multivariate scattering correction (MSC), feature extraction was conducted using the iterative information-preserving variable (IRIV) method, and a quantitative detection model for carbendazim terahertz transmission spectra was established based on LS-SVM. This provides a new approach for the quantitative detection of carbendazim. Experimental results show that the model has a high R-value. P The assay yielded a value of 0.9825, an RMSEP of 0.2001, and a detection limit (LOD) of 0.672 μg / ml. This invention provides a novel method for the rapid, non-destructive, and highly sensitive detection of carbendazim in food.

The invention relates to a terahertz metamaterial modulator based on lambda-Ti3O5 bistable phase change. The modulator comprises a silicon substrate layer (1); the semiconductor phase beta-Ti3O5 layer (2) grows on the surface of the silicon substrate layer (1); the lambda-Ti3O5 strip (3) of the metal phase is nested in the beta-Ti3O5 layer (2) of the semiconductor phase; and the metal strip (4) grows on the surface of the beta-Ti3O5 layer (2) of the semiconductor phase. The modulator further comprises a space pattern controller which is used for controlling the phase change area of Ti3O5 and achieving erasing and rewriting of the unit structure. Compared with the prior art, the terahertz modulator has the advantages of large modulation depth, dynamic adjustability of multiple functions and the like, has a wide application prospect in the terahertz related technical field, enriches terahertz regulation and control functional devices, and can promote the development of the terahertz technology.

This invention discloses a method for detecting aflatoxin B1 based on a BIC terahertz metamaterial sensor. Based on electromagnetic theory and the time-domain finite-difference method, a continuous-domain bound-state (BIC) terahertz metamaterial sensor was designed. Using this BIC terahertz metamaterial sensor, terahertz enhanced spectra of aflatoxin B1 solutions of different concentrations were acquired. Analysis revealed that the amplitude of the transmission peak of aflatoxin B1 around 1.5 THz gradually decreased with increasing aflatoxin B1 solution concentration, while the frequency of the transmission peak gradually shifted to lower frequencies with increasing aflatoxin B1 solution concentration. PLS and LS-SVM quantitative models for aflatoxin were established. Analysis showed that the LS-SVM model performed better, and the detection limit for aflatoxin B1 was found to be 2.04 × 10⁻⁶. ‑7 μg / ml. This invention enables rapid, non-destructive, and highly sensitive detection of aflatoxin B1 in grains.

The invention relates to the field of terahertz metamaterial devices, and provides a reconfigurable broadband / multi-frequency terahertz wave absorber based on vanadium dioxide. The wave absorber is composed of metamaterial square units which are arranged periodically, and adjacent units are gapless. Each unit is composed of six layers of structures including a vanadium dioxide resonance layer, an upper polyimide dielectric layer, a vanadium dioxide thin film layer, a copper resonance layer, a lower polyimide dielectric layer and a copper substrate layer. Vanadium dioxide can realize reversible phase change between a metal state and an insulation state through external excitation. In a metal state, the wave absorber has an ultra-wideband terahertz wave absorption function; and in an insulated state, a double-narrow-band absorption function is shown. According to the invention, the reconstruction of the absorption frequency and the bandwidth of the terahertz wave absorber is effectively realized, the problems of complex structure and fixed function of a traditional terahertz sensor are solved, and the potential of the terahertz wave absorber in sensing application of a single narrow-band wave absorber is further discussed.

The invention discloses a tunable graphene metamaterial sensor suitable for aerosol ink-jet printing, and belongs to the field of biomedical engineering. The tunable graphene metamaterial sensor is obtained by arranging a plurality of element atoms on a metal reflecting layer in an array; the element atom is composed of a structural layer, a substrate layer and a reflecting layer. Observed from the upper surface, element atoms of the metamaterial are composed of a circular ring structure; the circular ring structure is made of graphene; the substrate layer is a thick layer; the reflecting layer is a thin layer and is made of gold. And the meta-atoms are arranged in an array to obtain the metamaterial absorber. The interaction between the terahertz waves and the biomacromolecules is detected by matching the change of resonance frequency by utilizing the resonance absorption characteristics of the terahertz waves and the biomacromolecules, so that the detection sensitivity of the biomacromolecules is improved. By measuring the absorption characteristics of the terahertz metamaterial sensor under different biological analyte refractive indexes, enhanced detection of biological sensing is realized, and the interaction effect of terahertz waves and biological macromolecules can be detected.

The present invention relates to a sensing system and a measurement method based on a multi-order resonance all-dielectric terahertz metamaterial, which includes a terahertz emitter, a sensing device, a terahertz detector, and a post-processing system. The sensing device is composed of a multi-order resonance all-dielectric terahertz metamaterial with grooves and through holes etched on a silicon wafer. The terahertz emitter and the terahertz detector are respectively arranged above and below the sensing device for emitting and receiving terahertz signals. The terahertz detector is connected to the post-processing system to perform real-time processing and display of the detected terahertz signals. The measurement method of this system is as follows: Detect the terahertz signals without a sample, detect the terahertz signals of the multi-order resonance all-dielectric terahertz metamaterial when not loaded and loaded with a sample, and then calculate the sensitivity of the multi-order resonance all-dielectric terahertz metamaterial. This technical solution has multi-order resonance, a high quality factor, and sensing sensitivity, and can quickly and accurately perform terahertz sensing detection on samples.

The invention discloses a terahertz metamaterial sensor reverse design method based on transfer learning and reinforcement learning, and belongs to the technical field of terahertz metamaterial sensor design. In order to solve the technical problems that an existing terahertz metamaterial sensor is low in reverse design efficiency and insufficient in generalization ability, and structural parameters meeting a preset performance target are difficult to rapidly obtain, a hybrid deep learning model is firstly constructed and pre-trained, and then a generalization prediction model is obtained through an adversarial transfer learning mechanism. Then, a reinforcement learning optimization environment is established, finally, a depth deterministic strategy gradient algorithm is utilized, a generalization prediction model is used as an environment simulator for training, optimal metamaterial structure parameters are output, and reverse design of the terahertz metamaterial sensor can be efficiently achieved. The method is suitable for quickly acquiring sensor structure parameters meeting the requirements of a target frequency band, an absorptivity peak value and a quality factor.

The invention discloses an adjustable ultra-wideband terahertz metamaterial wave absorber, and belongs to the technical field of terahertz wave absorbers. The wave absorber is composed of a plurality of same metamaterial structure units which are periodically arranged, and each metamaterial structure unit is made of three layers of composite materials, wherein the first layer is a graphene pattern layer, the second layer is a polyimide dielectric layer, and the third layer is a copper reflecting layer. Wherein the graphene pattern layer adopts a combined design of four groups of square and L-shaped structures, and the four groups of structures form a biaxial symmetry layout through geometric coupling. The structure has the characteristics of wide absorption bandwidth, high absorption rate and dynamic adjustability, can realize more than 90% of efficient absorption in the frequency band of 2.28-4.68 THz, and can adjust the Fermi level of the graphene by externally applying bias voltage to realize rapid switching between the absorption state and the reflection state. The device is suitable for various application scenes such as terahertz communication, sensing and stealth.

The present invention provides a highly sensitive multifunctional terahertz metamaterial sensor, belonging to the field of terahertz sensing technology. The sensor is composed of a number of identical periodically arranged metamaterial structural units. The specific structure of the metamaterial structural unit is arranged successively from top to bottom as follows: a graphene pattern layer, an indium antimonide dielectric layer, and a metal reflection layer. Among them, the graphene pattern layer is composed of two sets of mutually nested resonant structures, and each set includes four L-shaped strips with equal size, biaxial and centrosymmetric. The present invention utilizes the electro-tunability of graphene and the thermal and magnetic sensitivity characteristics of indium antimonide to achieve excellent performance and diverse functions in sensing, expanding its application scope in the field of terahertz sensing.

The invention discloses a vanadium dioxide-based terahertz broadband chiral absorber capable of being actively regulated and controlled, and belongs to the technical field of terahertz metamaterial design. The problems that an existing chiral terahertz absorber is narrow in absorption bandwidth and single in light absorption function are solved. The terahertz broadband chiral absorber sequentially comprises a reflection bottom layer, an intermediate dielectric layer and a top layer from bottom to top; the top layer is formed by arranging a plurality of structural units in an array; each structural unit is composed of a Z-shaped gold structure and four vanadium dioxide micron plates; the four vanadium dioxide micron discs are symmetrically arranged on the left side and the right side of the middle longitudinal arm respectively and attached to the edges of the left side and the right side of the middle longitudinal arm. The invention is used for the vanadium dioxide-based terahertz broadband chiral absorber capable of being actively regulated and controlled.

The invention provides a crop disease detection device and method based on microfluidics and terahertz metamaterials, and relates to the technical field of agricultural detection. The crop disease detection device based on the microfluidics and the terahertz metamaterial comprises a modular microfluidic chip, a terahertz metamaterial sensor, a terahertz photoacoustic detection module and a signal processing system. According to the invention, a sample is preprocessed through microfluidic control, sound waves are excited by using a terahertz photoacoustic technology, and rapid detection of diseases is realized by combining multi-dimensional terahertz characteristics and a deep learning model. The method has the advantages of short detection time, high sensitivity, strong anti-interference capability and the like, and is suitable for field in-situ detection.

The present invention discloses a tunable electromagnetically induced transparent metamaterial and its tuning method and application, which belong to the field of terahertz metamaterial technology. The tunable electromagnetically induced transparent (EIT) metamaterial is arranged in order from top to bottom: a vanadium dioxide film, a dielectric layer, a grating layer and a reflective layer. The EIT-like effect is generated by the guided mode resonant coupling between the grating and the dielectric layer, avoiding the complex structure of the metasurface used in the past. The metamaterial achieves flexible adjustment of the EIT-like peak (63%-98%) and the slow light effect in the EIT-like window (group delay 1.87ps-2.86ps) by externally stimulating the change in the conductivity of vanadium dioxide (45000S / m-200S / m). It has the advantages of simple structure, easy processing, and easy operation of the tuning method.

The invention discloses an aflatoxin G1 content detection method based on terahertz metamaterial resonance enhancement, a terahertz metamaterial absorber is composed of a plurality of periodic structure units, and each periodic structure unit is of a square structure. The periodic structure unit comprises four cross-shaped structures located in the middle and four strip-shaped structures located on the peripheries of the four cross-shaped structures, terahertz spectrum information of aflatoxin G1 solutions with different concentrations is collected based on the terahertz metamaterial absorber, and it is found through analysis that the terahertz spectrum information of the aflatoxin G1 solutions with different concentrations is within the frequency band of 0.5-3.0 THz. Along with the increase of the concentration of the aflatoxin G1 solution, the amplitudes of characteristic peaks at 0.7 THz and 2.1 THz are regularly attenuated and slightly blue-shifted, in the established least square support vector machine model, the performance of the model which is subjected to non-information variable elimination characteristic extraction and adopts an RBF kernel function is better, the RP is 0.9451, and the detection limit LOD is 2.18 * 10 <-6 > mu g / ml. With the adoption of the method, rapid, nondestructive and high-sensitivity detection of the aflatoxin G1 can be realized.

The present invention provides a terahertz metamaterial biosensor and its application. Based on micro-nano processing technology, the present invention attaches a subwavelength metal resonant ring array on a dielectric substrate to form a metamaterial sensor. The subwavelength metal resonant ring is composed of two fan-shaped resonant rings with an angle of 60° to form a structure similar to the shape of an "8", and two gaps are formed at the upper and lower ends of the structure to generate annular dipole resonance, which can achieve high quality factor and high sensitivity sensing in the terahertz band. Colloidal gold nanoparticles functionalized by biomodification technology not only enhance the sensing performance of the metamaterial biosensor and significantly reduce the detection limit, but also achieve specific recognition of the cancer marker carcinoembryonic antigen. The metamaterial sensor combined with functionalized gold nanoparticles proposed by the present invention has excellent high quality factor sensing performance, can achieve high sensitivity and specific detection of carcinoembryonic antigen, the method is simple and effective, and has broad application prospects.

The invention provides a terahertz metamaterial molecular fingerprint sensing method and system based on multi-task learning, and belongs to the field of terahertz biosensing application. The method comprises the following steps: acquiring a terahertz reflection spectrum of a to-be-detected sample, and extracting physical characteristics of the reflection spectrum; inputting the terahertz reflection spectrum, the corresponding incident angle and the physical characteristics into a trained multi-task learning model, encoding the reflection spectrum, the incident angle and the physical characteristics through a lightweight full-connection network, and mapping the encoded reflection spectrum, the encoded incident angle and the encoded physical characteristics to a unified embedding space; performing feature extraction on the encoded feature vector by using a decoder, and fusing and compressing the feature vector into a compact potential representation through a sharing layer; and inputting the potential representation into a classification head and a regression head, and outputting a molecular category identification result and a concentration prediction result of the to-be-detected sample. According to the method, the performance bottleneck of a traditional single-task model in identification of highly similar molecules is overcome, the problem of low multi-angle scanning efficiency is solved, and high-precision and high-efficiency molecular perception is realized.

The invention provides a terahertz metamaterial biosensor, which relates to the technical field of terahertz and is formed by splicing a plurality of sensing units. The sensing unit comprises a substrate layer and a dielectric substance layer; the dielectric substance layer is arranged on the substrate layer; the dielectric substance layer comprises 25 micro-nano units which are distributed in a 5 * 5 array; each micro-nano unit comprises a cylinder and three identical cuboids; the three cuboids are arranged on the cylinder; the heights of the cylinders of the micro-nano units in the first area are equal and defined as a first height, the heights of the cylinders of the micro-nano units in the second area are equal and defined as a second height, and the heights of the cylinders of the micro-nano units in the third area are equal and defined as a third height; the second height is greater than the third height which is greater than the first height; the first region is an inner ring of the dielectric substance layer, the second region is a middle ring of the dielectric substance layer, and the third region is an outer ring of the dielectric substance layer. The method has high robustness for structural local defects, disordered disturbance and environmental noise.

The invention discloses a broadband all-optical metasurface modulator applied to a terahertz calculation spectrometer and single-pixel imaging, and relates to the technical field of terahertz metamaterials, and the broadband all-optical metasurface modulator is formed by repeatedly arranging a plurality of unit structures; each unit is formed by placing a substrate and two double-opening metal ring resonators on the substrate. Each double-split-ring resonant body is of two independent structures formed by a truncated square ring; wherein one double-split-ring resonant body is composed of two symmetrical C-shaped structures, and openings of the C-shaped structures are oppositely arranged; the other double-opening resonance body is of an asymmetric structure and is composed of an asymmetric C-shaped structure and an L-shaped structure. The invention further discloses a system for detecting the component content of the biological sample. The system comprises a terahertz source, a lens, an object to be detected, the broadband all-optical metasurface modulator, another lens, the SPD and a data acquisition and recording module which are sequentially arranged on the same optical axis.

The present invention relates to a concave quasi-continuous domain bound state terahertz metamaterial sensor, which has a number of periodic array units in the horizontal and vertical directions. The array units are composed of a metal metasurface, a dielectric layer, and a metal backplane with a depth greater than the skin depth of the incident wave from top to bottom. The metal metasurface consists of two parts, one of which is a cylindrical structure with a double fan-shaped opening, and the other is a closed resonant ring. The opening angle of the left side of the double fan-shaped opening is unequal to the opening angle of the right side. The cylindrical structure with the double fan-shaped opening is located within the closed resonant ring, and part of the volume of the cylindrical structure is embedded in the dielectric layer. The constructed sensor generates two resonance peaks under the excitation of a vertically incident terahertz wave, respectively at 3.44THz and 3.51THz, with a maximum quality factor Q value of 3096. The present invention innovatively constructs a disk structure with unequal opening angles on the left and right sides to achieve quasi-BIC resonance, with the advantages of high refractive index sensitivity, good linearity, simple structure and easy processing.

The present invention relates to a broadband transmission detection device based on a double-layer terahertz metamaterial and a method for using the same, which includes a first moving fixture and a second moving fixture oppositely arranged along the X-axis direction. The first moving fixture is installed on a one-dimensional moving platform that moves along the X-axis direction, and the one-dimensional moving platform is installed on an optical platform. A sample holder is provided on the first moving fixture, and a first central hollow is provided in the middle of the sample holder to facilitate the passage of terahertz waves. The second moving fixture is arranged on the vertical fixed seat of the terahertz spectroscopy system and moves along the Y-axis and Z-axis directions. A second central hollow is provided on the second moving fixture to facilitate the passage of terahertz waves. The double-layer terahertz metamaterials are respectively arranged on the sample holder and the second moving fixture. The present invention has a reasonable design, and during the experiment, the relative position between the metamaterials can be conveniently and quickly adjusted to better align the unit holes between the layers, reducing experimental errors, so as to achieve a better broadband filtering effect.