7 results about "Terahertz metamaterials" patented technology

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 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.

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 application provides a square-shaped heterostructure terahertz metamaterial sensor device and a preparation method thereof. The device comprises a heterostructure sandwich structure which is formed by constructing a multilayer structure on a silicon material. The multilayer structure is composed of a top metal square array unit, a middle dielectric layer and a bottom metal reflection layer. The sensor device controls the full width at half maximum of the plasmonic resonance peak by adjusting the thickness of the dielectric layer to achieve wide resonance enhancement. The metal square array unit adopts two structure size parameters, and the overall architecture scaling realizes the spectral response of different wave bands. When the sensor device works, the terahertz wave is vertically incident on the heterostructure sandwich structure and induces the excitation of the plasmonic mode, so that the signal of the outgoing terahertz wave received by the terahertz receiver presents the super-wideband resonance characteristic. The application can control the spin coating speed of photoresist to customize the wide-spectrum resonance characteristic of the plasmon excited by the square-shaped heterostructure terahertz metamaterial under two different structure scales.

The application relates to the field of pesticide residue detection, in particular to a sensor based on terahertz metamaterial and a multi-residue pesticide detection device and method. The sensor based on terahertz metamaterial comprises a substrate and a plurality of double resonators arranged in a periodic array on the substrate; wherein the substrate has an Au layer, a Ti layer and a PI layer arranged in a stack; the double resonator comprises a herringbone structure and two linear structures, and each of the herringbone structure and the linear structure has a Ti layer and an Au layer arranged in a stack from the PI layer of the substrate to the Au layer away from the substrate; the middle positions of the upper horizontal line and the lower horizontal line of the herringbone structure are interrupted; each linear structure is located in one port of the herringbone structure, is parallel to the horizontal line of the herringbone structure, and is spaced from the outline surrounded by the herringbone structure by a gap. The application can realize synchronous detection of multiple pesticide residues, and has high sensitivity.

This invention addresses the shortcomings of existing terahertz sensors in terms of sensitivity and tunability by proposing a high-sensitivity metamaterial sensor based on plasmon-induced transparency (PIT) and Fano resonance in monolayer graphene. The specific graphene sensing structure of this invention consists of a vertical graphene strip and proportionally designed graphene resonant rings on both sides. This symmetrical graphene structure is attached to a SiO2 dielectric layer with a suitable relative permittivity, forming a typical transmission-type metamaterial sensor. The resulting terahertz metamaterial sensor possesses an excellent sensitivity of up to 2.84 THz / RIU, a superior quality factor, and insensitivity to changes in polarization and incident angle. Furthermore, by adjusting the structural parameters, flexible switching between dual functions can be achieved, significantly enhancing the accuracy of material detection and the range of sensing applications. This invention offers advantages such as high sensitivity, strong tunability, simple structure, and high stability. This design integrates the excellent characteristics of Fano resonance and the PIT effect, achieving the high sensitivity requirements of the sensor and successfully overcoming the performance limitations of traditional single-function sensors.

The application discloses a kind of filled terahertz metamaterial broadband absorbers based on resonant ring, belong to the technical field of terahertz wave function device.The absorber includes metal reflection layer, intermediate dielectric layer on the metal reflection layer, super material structure layer on the intermediate dielectric layer, the super material structure layer is composed of multiple array arranged unit structure, unit structure includes first square resonant ring and second square resonant ring in first square resonant ring, first square resonant ring and second square resonant ring are provided with the first opening and the second opening of same size on four edges, unit structure is axisymmetric figure;The material of first square resonant ring and second square resonant ring is copper, gold, aluminum or silver, and first opening and second opening are filled with metal titanium or platinum.The application introduces high-loss metal to fill in the opening of conventional open resonant ring, utilizes the resonance of resonant ring and the high absorption of metal filled in opening, realizes the terahertz absorber with very wide absorption band.