152 results about "Terahertz metamaterials" patented technology

Metamaterial structures are taught which provide for the modulation of terahertz frequency signals. Each element within an array of metamaterial (MM) elements comprises multiple loops and at least one gap. The MM elements may comprise resonators with conductive loops and insulated gaps, or the inverse in which insulated loops are present with conductive gaps; each providing useful transmissive control properties. The metamaterial elements are fabricated on a semiconducting substrate configured with a means of enhancing or depleting electrons from near the gaps of the MM elements. An on to off transmissivity ratio of about 0.5 is achieved with this approach. Embodiments are described in which the MM elements incorporated within a Quantum Cascade Laser (QCL) to provide surface emitting (SE) properties.

The invention provides a terahertz metamaterial biosensing chip and a testing method of the terahertz metamaterial biosensing chip. The terahertz metamaterial biosensing chip comprises a substrate and a sub-wavelength metallic split-ring resonator array attached on the substrate, wherein the substrate is made of a material having the absorption coefficient less than 0.5-1cm under the terahertz waveband; the sub-wavelength metallic split-ring resonator array comprises multiple split-ring resonator units, each split-ring resonator unit is a square metal frame; and the middle parts of the edges of the square metal frame are provided with same openings respectively. Compared with the existing biosensor, the terahertz metamaterial biosensing chip is made of the terahertz metamaterial, so that the uniformity of the terahertz metamaterial biosensor structure is improved, and the sensing sensitivity is improved due to the uniformity and simple structure design.

Terahertz metamaterials comprise a periodic array of resonator elements disposed on a dielectric substrate or thin membrane, wherein the resonator elements have a structure that provides a tunable magnetic permeability or a tunable electric permittivity for incident electromagnetic radiation at a frequency greater than about 100 GHz and the periodic array has a lattice constant that is smaller than the wavelength of the incident electromagnetic radiation. Microfabricated metamaterials exhibit lower losses and can be assembled into three-dimensional structures that enable full coupling of incident electromagnetic terahertz radiation in two or three orthogonal directions. Furthermore, polarization sensitive and insensitive metamaterials at terahertz frequencies can enable new devices and applications.

The invention discloses a flexible terahertz metamaterial wave absorber and a manufacturing method thereof. The wave absorber comprises a layer of patterned metal thin film, a layer of flexible dielectric thin film and a layer of continuous metal thin film sequentially from top to bottom. The wave absorber manufacturing method comprises steps: the layer of continuous metal thin film is deposited on one surface of the flexible dielectric thin film; the patterned masking thin film covers the other surface of the flexible dielectric thin film, the other layer of metal thin film is deposited on the surface, the masking thin film and the flexible dielectric thin film are separated, and the patterned metal thin film with a complementary pattern with the masking thin film is obtained on the other surface of the flexible dielectric thin film. The flexible terahertz metamaterial wave absorber has the advantages of being flexible and retractable; the flexible terahertz metamaterial wave absorber can be bent through applying an external force, and the absorbing coefficient is thus changed; the terahertz response performance can be adjusted conveniently; the manufacturing method is simple; and the manufactured masking thin film can be used repeatedly for multiple times.

The invention discloses a broadband terahertz metamaterial absorber based on L-shaped structures and belongs to the technical field of metamaterials and electromagnetic function materials. The broadband terahertz metamaterial absorber comprises a metal reflection layer, a dielectric layer and a metal pattern layer, the metal reflection layer is a continuous metal thin film, thickness of the metal reflection layer is larger than skin depth of working terahertz wave, the dielectric layer is positioned between the metal reflection layer and the metal pattern layer and is a silicon dioxide thin film, the metal pattern layer is formed by periodically arranging the L-shaped unit metamaterial structures, and each L-shaped unit metamaterial structure is formed by connecting a horizontal arm and a vertical arm which are perpendicular to each other. By reasonably designing geometric size and lattice period of the L-shaped structures and thickness of the dielectric layer in the middle, the characteristic that electromagnetic waves vertically coming to the surface of a metamaterial are absorbed completely can be realized. The broadband terahertz metamaterial absorber is simple in graph pattern and needless of stacking of multiple layers of materials, has characteristics of wide frequency band and high absorptivity and can be used for an electromagnetic wave collecting and detecting device.

The invention discloses a biological sample signal amplification method adopting the combination of terahertz metamaterials and nanogold particles. The method comprises the following steps: preparing a plurality of biological sample solutions with different concentrations and gold standard avidin solutions with different concentrations; dropwise adding the biological sample solutions onto the surfaces of the terahertz metamaterials, and airing at the room temperature; dropwise adding the gold standard avidin solutions on the surfaces of the terahertz metamaterials, and airing at the room temperature; collecting terahertz time-domain signals of all sample points to be measured on the surfaces of the terahertz metamaterials and reference sample points; calculating the transmissivity or the reflectivity of all the sample points to be measured and the reference sample points according to the terahertz time-domain signals; and calculating to obtain the frequency shift of transmission peaks or reflection peaks according to the frequency value corresponding to the lowest point of the transmissivity or the reflectivity. According to the method, the terahertz metamaterials and the nanogold particles are used for modifying; the sample signals are amplified by using an electric field local enhancement effect of the metamaterials; the electric field distribution effect is changed by nanogold, and the sample signals are further amplified by nanogold modifying; and the detection is high in sensitivity, the operation is convenient and fast, and fast detection requirements increased day by day are met.

The invention relates to a filter of tunable terahertz metamaterial and a preparation method thereof based on low-voltage-driven liquid crystal material with the aim of solving problems of an existing filter of tunable terahertz metamaterial such as fixed working wavelength, limited working bandwidth, narrow application scope, complicated structure and preparation technology and low reliability. The filter is in the structure of a multi-layer flat plate and comprises a glass substrate layer, a first metal structure layer, an insulation layer, a metal seed layer, a second metal structure layer, liquid crystal material and a glass cover plate. The preparation method comprises following steps: first, preparation of metal structure layers; second, preparation of the insulation layer; third, preparation of the metal seed layer; fourth, preparation of a mould structure used for electroplating; fifth, preparation of a periodic slit-metal structure; sixth, filling of liquid crystal material and covering with the glass cover plate. The filter of tunable terahertz metamaterial and the preparation method thereof based on low-voltage-driven liquid crystal material have following beneficial effects: the filter is low in needed voltage, simple in structure, wide in tuning range, high in response speed and good in chemical stability and is not sensitive to polarization; and the method is suitable for preparation of filter of tunable terahertz metamaterial filter of tunable terahertz metamaterial.

The invention provides a terahertz metamaterial device for detecting circulating tumor cells and a preparation method thereof. The device is mainly characterized with a stereo terahertz metamaterial,supplemented by a liquid diversion region. Only a small amount of blood sample is introduced from an inlet hole in a cover plate, and then blood cells of smaller size can be filtered according to structural features. Cancer cells of larger size are fixed at the sensitive positions, namely the clamping positions, of a metamaterial resonant structure. The cancer cells in the sample can be detected by comparing spectral changes before and after the sample is introduced. In addition, the device enables single separation of cancer cells, and can be used for subsequent biological study of individualcancer cells, so as to master the trait changes of each individual cancer cell stimulated by external conditions based on spectral analysis. Compared with the prior art, the device has high sensing sensitivity, and has remarkable effects when being used for fixed-point capture or large cell monitoring.

The invention discloses a modulation method and product of a terahertz metamaterial and belongs to the field of metamaterials. The method comprises the steps that firstly, a periodic cylindrical air cavity is formed in a substrate of a PDMS material, then a flexible medium PDMS thin film is arranged above the air cavity, and the metamaterial is arranged on the PDMS thin film; then, outside pressure is added, so that the flexible medium PDMS thin film above the air cavity is protruding or sunken, then geometric parameters of the metamaterial on the PDMS thin film are changed, and finally the response to the incident terahertz wave is modulated. The invention further provides the product which achieves the modulation method. The product comprises a metamaterial structure and a PDMS substrate, the metamaterial structure is arranged on the PDMS substrate, the metamaterial comprises the PDMS thin film and a two-dimension periodic array which is arranged on the PDMS thin film, and the periodic cylindrical air cavity is formed in the PDMS substrate. The modulation method is simple and reliable, is easily controlled, and is relatively high in modulation performance of the linearly polarized beam and the circularly polarized light.

The invention provides a continuously adjustable degradable terahertz meta-material based on optical driving and preparation method thereof. The degradable terahertz meta-material comprises a sodium alginate substrate, a metal layer and a semiconductor film which are arranged on the sodium alginate substrate; the patterns of the metal layer and the semiconductor film are completely same: three equally spaced openings are formed on the outer ring, two equally spaced openings are formed on the middle ring, and one opening is formed on the inner ring; one of the three openings on the outer ring is aligned with one opening on the middle ring, and the other opening on the middle ring is aligned with the opening on the inner ring. Since the concentrations of carriers produced by the semiconductor film under different optical power excitations are different, the continuous tuning on the electromagnetically responded resonance strength from different conductivities is realized. The meta-material provided by the invention is simple in structure and processing technique, has degradable property and can be used for biomolecule detection, so that the incident electromagnetic wave of the terahertz meta-material has a plurality of frequency bands with continuously tuned strength in the terahertz waveband transmission.

The invention provides a multiband terahertz meta-material absorber, which belongs to the technical field of multiband terahertz meta-material absorbers and is used to solve the problem that high absorption of electromagnetic waves can be achieved only in a single, two or three frequency bands. The meta-material absorber of the invention is composed of a plurality of absorber units. Each absorberunit is composed of a bottom metal film 1, an intermediate loss medium 2 and a top metal film arranged in sequence from bottom to top, and the bottom metal film 1, the intermediate loss medium 2 and the top metal film cling to one another. The bottom metal film 1 is an all-metal film. The top metal film is an asymmetric metal split ring 3. The geometric center of the asymmetric metal split ring 3,the geometric center of the intermediate loss medium 2 and the geometric center of the bottom metal film 1 are in a straight line. By reasonably designing the geometric size and lattice period of theasymmetric metal split rings, electromagnetic waves vertically incident on the surface of a meta-material can be absorbed completely. The meta-material absorber provided by the invention has high absorption rate, is simple in structure, and has five absorbing peak points.

The invention relates to a terahertz tuning device based on graphene and aims to solve problems of single tuning frequency and small tuning depth in terms of existing terahertz metamaterial tuning devices. The terahertz tuning device based on the graphene comprises a substrate, an insulating medium layer and a split resonant ring structured graphene layer, the substrate is horizontally arranged on a lowest layer, the insulating medium layer is parallelly disposed on the upper surface of the substrate, and the split resonant ring structured graphene layer is parallelly disposed in the middle of the upper surface of the insulating medium layer. The terahertz tuning device based on the graphene is used for the field of terahertz communication.

The invention discloses a terahertz metamaterial waver absorber with a proactively tunable frequency and a manufacturing method thereof. The wave absorber comprises a bottom structure, an intermediatedielectric layer and a top resonant structure. The bottom structure includes at least one metal film. The intermediate dielectric layer is fixed to the bottom structure. The top resonant structure isfixed to the intermediate dielectric layer, and includes a plurality of metal resonant structures arranged in an array. The plurality of metal resonant structures are fixed to the same end surface ofthe intermediate dielectric layer away from the bottom structure. A resonant cavity is disposed in each of the metal resonant structures. Each resonant cavity and the corresponding metal resonant structure are in a cross shape and have a coincident center. Both the metal film and the metal resonant structures are made of copper. The intermediate dielectric layer is made of a flexible PDMS material. Each resonant cavity is filled with a SrTiO3 material. The waver absorber realizes control of incident electromagnetic waves, tunes the wave absorbing frequency of the metamaterial in a large range, and overcomes the limitation of the passive tuning method of the wave absorbing property of the metamaterial.

The invention provides a tunable terahertz graphene metamaterial absorber. The tunable terahertz graphene metamaterial absorber comprises a four-layer structure laminated together: including a patterned graphene metamaterial top layer, a dielectric middle layer, a metal bottom layer and a substrate; the metal bottom layer is arranged on the substrate; the dielectric middle layer is arranged on themetal bottom layer; and the patterned graphene metamaterial top layer is arranged on the dielectric middle layer. Graphene is adopted to replace the conventional metal structure to establish the terahertz metamaterial absorber, and the Fermi energy of two graphene circular plates are tuned through static doping, so that the resonance characteristic of the two graphene circular plates and the nearfield coupling characteristic between the circular plates can be controlled, thereby realizing flexible control on the absorption strength, bandwidth and frequency of the absorber.

The invention discloses a terahertz metamaterial polarization isolator, and relates to a sub-wavelength reflection polarization isolation device. A metal optical grating is arranged on the bottom surface of a dielectric substrate, a metal paster array is arranged on the top surface of the dielectric substrate, the radiation metal paster array is arranged periodically, and each periodic unit is onerow; each metal paster is in the shape of a square ring in which an opening is formed, each opening is formed in the position of the middle point of one side of the corresponding square ring, and thesides of each metal paster are arranged orthogonally. By adopting a two-dimensional plane artificial microstructure, phase regulation for TeraHertz waves is realized through a monolayer array, and the isolator is simple in structure, can be realized through micro machining means, and is mature in technology and easy to manufacture.

The invention discloses an adjustable terahertz metamaterial absorbing structure. The structure comprises a dielectric material substrate and metamaterial units distributed on the substrate, any one metamaterial unit comprises a pair of bottom metal layers correspondingly arranged and a super material array, the super material array is fixedly arranged on a flexible dielectric film, a cavity is formed between the flexible dielectric film and the bottom metal layers, the pressure of the cavity is regulated to achieve the regulation and control of the whole supper material absorbing structure for the terahertz absorbing. Through the whole formation of the supper material absorbing structure, special improvement for the key super material regulation and control principle (namely a corresponding) terahertz wave attraction control principle and the related corresponding components, the problems can be solved that the supper material is not convenient to prepare and not flexible in regulation compared to the prior art.

The invention discloses a graphene-based terahertz double-band wave absorber adjusting method, belongs to the field of terahertz metamaterial wave absorption, and aims at realizing perfect absorptionin terahertz double-band and changing wave absorption bands through changing chemical potential of graphene. According to the method, a designed wave absorber unit comprises a layer of full-metal film(1), a layer of dielectric film (2) and a layer of patterned graphene (3) from bottom to top, wherein the three layers are mutually laminated; the metal film layer adopts a conductor of gold or silver; and the intermediate dielectric layer uses silicon dioxide. Analog computation is carried out through a finite element method, and a reflection spectrum of the structure is observed to realize perfect absorption in in terahertz double-band. The metasurface wave absorber has the advantages of being strong in absorption, insensitive in polarization, simple in structure and convenient to process;and due to the Fermi-level adjustability, the dynamic adjustability of resonant frequency of the wave absorber can be realized, and the requirements for application in the terahertz absorption aspectcan be satisfied.

The invention discloses a multilayer annular terahertz metamaterial wave absorber comprising a bottom metal reflector plate and a multilayer structure above the metal reflector plate and characterizedin that the multilayer structure comprises three dielectric substrates and resonant units above respective dielectric substrates, wherein each resonant unit is coated with a high-resistance surface.The wave absorber has a good absorption effect on TE polarized waves and TM polarized waves. By coating the resonant unit above each dielectric substrate with the high-resistance surface, the wave absorber can achieve ultra-wideband wave absorption in the terahertz band. The multilayer annular terahertz metamaterial wave absorber avoids metal ohmic loss and heat loss by coating the resonant unitsabove the dielectric substrates with the high-resistance surfaces, so as to be suitable for operating in the light wave and terahertz band. The multilayer annular terahertz metamaterial wave absorberis simple in structure, flexible in design and powerful in functions.

The invention belongs to the field of electromagnetic wave absorption and radiation control, and in particular relates to a design method of a terahertz broadband absorbing metamaterial. According to the effective medium theory, and using CST microwave studio to obtain S parameters through frequency domain simulation, the periodic unit structure is at x Both the and y directions are periodically distributed, and are set as periodic boundary conditions. Combining the parameters S11 and S21 obtained by scanning, the impedance value is calculated. By changing the period of the unit structure and the size of the metal thin film and dielectric material, the corresponding absorption frequency is adjusted, and multiple metal thin films and dielectric materials are cross-stacked in one unit period, so that the absorption lines corresponding to different resonant circular frustums are superimposed. The invention can effectively broaden the absorption spectrum of the terahertz frequency band, so that the frequency band with an absorption rate exceeding 90% can be widened, and meanwhile, a certain high relative absorption bandwidth can be guaranteed. And the first 9 absorption peaks are caused by the interior of the unit structure, so they are not affected by the period.

The invention relates to the technical field of terahertz metamaterial functional devices, in particular to a graphene metamaterial terahertz device capable of being dynamically regulated and controlled based on an anapol mode and a preparation method and application of the graphene metamaterial terahertz device. The terahertz device comprises the following parts: a single-layer metamaterial witha periodic structure; the unit structure of the periodic structure is of a circular ring structure and is composed of two symmetrically-arranged semicircular split rings made of metal materials, eachsplit ring is composed of a ring body and an extension arm, and the extension arms extend from the ring bodies to the circle centers of the ring bodies; an opening is formed between the two split rings, the opening penetrates through the diameter of a circular ring structure formed by the two semicircular split rings, and the extension arms are perpendicular to the opening; openings of the ring bodies and the extension arms are filled with graphene. The Fermi energy of the graphene is adjusted through electrostatic doping, so that the conductivity of the graphene is tuned, and terahertz anapleresponse dynamic tuning is realized.

The invention relates to a renewable universal terahertz metamaterial sensor. Various types of targets to be tested are accurately captured on the surface of the metamaterial chip through the universal probe and aptamer, the specific cleavage site of the enzyme cleavage aptamer is cut by the uracil to obtain the universal reusable renewable terahertz metamaterial sensor. The rapid, unlabeled, specific and combined detection of various target targets such as pathogens and drug resistance genes thereof can be achieved by immobilizing the specific aptamers of different kinds of targets in different reaction modules of metamaterials. The number of repeated detections reached 6 times, the detection time is only 2 hours, and the lowest bacterial concentration was detected as low as 100 cfu/mL.

The invention relates to an RCA-terahertz metamaterial biosensor and a method for rapidly detecting multi-drug resistant tuberculosis. The biosensor comprises a terahertz metamaterial, a capture probe and a polystyrene slide, wherein the capture probe is wrapped with the reaction zone of the terahertz metamaterial to identify a to-be-detected template sequence, the upper layer of the terahertz metamaterial is covered with the polystyrene slide, a liquid film cavity gap used for liquid phase amplification reaction is formed, the capture probe wrapped with the RCA-terahertz metamaterial biosensor is crossbred with an RCA circular template, in-situ replication amplification is realized, the result obtained with the method is stable and reliable, and detection of five drug resistant sites of multi-drug resistant tuberculosis can be finished in three hours.

The invention provides a terahertz ring couple device based on a photoselective regulation of metal-two-dimensional organic-inorganic hybrid perovskite material and a preparation method thereof, relates to the field of microelectronics and terahertz metamaterial functional devices, and solves the problems of complicated structure and preparation process, single function and narrow application range of the existing terahertz ring dipole metamaterials. The device comprises a substrate, two periodically arranged double-opening metal resonance ring structural units and two-dimensional organic-inorganic hybrid perovskite with different components respectively covered on the two double-opening metal resonance rings. The method comprises the steps: high resistance silicon is coated with photoresist, pre-baked, exposed, developed and fixed; metal is deposited; Parylene is deposited to form a mask structure; a perovskite solution is coated; annealing is performed; Parylene is deposited to forma mask structure; the perovskite solution is coated; and annealing is performed. The device has the advantages of simple application conditions, free switching of working modes, simple process and lowcost. The device is applied to the field of microelectronics and terahertz metamaterial functional devices.

The invention provides a method for detecting a liquid sample based on a terahertz technology, and the method comprises the steps: S1, providing a terahertz spectrum device, a container capable of accommodating the liquid sample, and a metamaterial sensor made of a terahertz metamaterial, wherein the metamaterial sensor is clung to the inner wall of one side of the container; S2, preparing to-be-detected biomolecules into a reverse micelle emulsion and adding the biomolecules into the container, wherein the reverse micelle emulsion is an emulsion with a continuous phase as an oil phase, a dispersion phase as a water phase and phospholipid molecules as a surfactant, the phospholipid molecules exist in a reverse micelle form, and the to-be-detected biomolecules are wrapped in the dispersionphase; and S3, acquiring spectral information of the to-be-detected body in a terahertz waveband by using a terahertz spectrum device so as to realize detection of the liquid sample. According to theinvention, a terahertz spectrum device is utilized, and based on the combination of a terahertz metamaterial and reverse micelles, the properties and interaction of the biomolecules are detected and quantitative detection is carried out in a microenvironment close to physiological conditions and in a phospholipid self-assembly form.

The invention relates to the technical field of terahertz waveguides, and provides a terahertz metamaterial waveguide and a terahertz device. The terahertz metamaterial waveguide comprises a subwavelength substrate layer and a metal layer, one surface of the subwavelength substrate layer is plated with the metal layer, and a plurality of periodically-distributed micropores are formed in the metal layer. By adopting the ubwavelength substrate layer and plating the metal layer, in which the plurality of periodically-distributed micropores are formed, on the surface of the ubwavelength substrate layer, the terahertz metamaterial waveguide can significantly reduce the thickness of the terahertz waveguide and the transmission loss of terahertz waves transmitted in the terahertz waveguide, and saves the manufacturing cost.

The invention discloses a terahertz metamaterial biosensor and a preparation method and detection method thereof. The biosensor comprises a substrate, a metamaterial structure, and identification units. The metamaterial structure arranged on the substrate is used for responding to terahertz waves; and a plurality of detection areas are arranged on the metamaterial structure. The identification units modified on the detection areas are used for identifying different markers. According to the terahertz metamaterial biosensor, the adopted metamaterial has an asymmetric high-Q-value structure andis sensitive to the change response of surrounding environment media highly; the cancer marker is combined with the surface of the metamaterial structure to cause the red shift of a terahertz transmission spectrum; and the concentration of the cancer marker and peak position shift are in functional correlation. The concentration of the marker in the serum of a patient can be detected by a comparison curve of the detection concentration of the marker and the terahertz transmission spectrum.