59 results about "Resonance angle" patented technology

The invention relates to a method for measuring a thickness of a metal film of a lithographic mask and belongs to the field of physical measurement. The method comprises the following steps of: placing a prism of which the bottom surface is evaporated with a gold film close to a metal chromium surface of the mask so as to form a double-sided metal waveguide structure to be measured; selecting a laser wavelength and a polarization mode of an incident angle; receiving and recording the light intensity of a laser beam reflected from the bottom of a coupled apparatus or the light intensity of a laser beam transmitted from a lower metal film; changing the laser incident angle to obtain a curve of the light intensity and the incident angle; finding a resonance angle of absorption peaks of a guided mode and a width and a depth of the corresponding absorption peak; and calculating to obtain a refractive index and a thickness value of a thin film material. According to the invention, the high accuracy measurement is realized. The method is easy for operation and miniaturization.

A surface plasmon resonance sensor comprising a chip having a substrate (102) and a metal layer (103), a prism (104), an optical system (105) becoming a light source, and a photodetector (106), wherein the metal layer (103) consists of a flat part (109) in the form of a thin film, and protrusions consisting of fine metal particles (110) or the like arranged at intervals. When light impinges on such a metal layer (103), a resonance angle caused by the flat part (109) and each protrusion is attained. Variation in the refractive index of a medium touching the metal layer can be detected from the resonance angle.

The invention discloses a long-range surface plasma resonance sensor and a preparation method thereof. The sensor is formed by bonding a BK7 prism and a glass slide through cedar oil, wherein the outer surface of the glass slide is plated with a magnesium fluoride thin film, a silver film and a gold film in turn; the gold film is directly contacted with biological solution to be detected and is used for detecting the biological solution in a mode of angle modulation; magnesium fluoride with the refractive index of about 1.38, which is close to that of the biological solution, can form approximatively symmetric structures on two sides of a metal conductive layer so as to ensure that surface plasmas on the two sides of the metal conductive layer are coupled to form the long-range surface plasma; compared with other metals, the metal silver used as the conductive layer has a narrower half band width of a resonance absorption peak, but has unsteady chemical properties; a conductive layer gold film can make a resonance angle generate a greater transition along with the change of the refractive index of the biological solution to be detected; simultaneously, the conductive layer gold film has stable chemical properties and high biological affinity. The specific multilayer film structure can integrate the advantages of each film and effectively improve the sensitivity of biological sensors.

A robust multichannel SPR instrument with exceptionally high sensitivity (<pg/mm²). The instrument utilizes an SPR detection scheme providing multiple reflections from a planar light guide configuration to amplify the reflected light intensity changes near the resonance angle. This SPR approach is amenable to simultaneous multichannel detection while maintaining high sensitivity with a simple, cost-effective design. The idea of using multiple reflections to excite multiple surface plasmon waves seems counterintuitive at first because the SPR resonance will be broadened; the broadened resonance will diminish sensitivity for angle or wavelength detection modes. However, changes in reflected light intensity near the resonance angle will be amplified by the multiple reflections, thereby increasing the sensitivity of SPR utilizing intensity detection at a fixed angle of incidence.

The invention discloses a preparation method for a surface plasmon resonance (SPR) DNA sensor based on graphene oxide, and belongs to the technical field of nanometer material biology. The technical problem to be solved in the preparation method is that the distinctive effect of graphene oxide-DNA is utilized, the surface plasmon resonance technology and the signal amplification mechanism of the AuNPs are applied, based on the competitive inhibition method, the phenomenon that the single-stranded DNA with different concentrations is absorbed on the surface of a sensing chip to cause SPR spectral change, and the single-stranded DNA is detected through the linear change of the resonance angle. Through the adoption of the preparation method, the SPR technology is adopted, the GO (Graphene Oxide) is utilized to assemble the surface of the chip, the single-stranded DNA is sensitively detected through adopting the competitive inhibition method and the AuNPs signal amplification effect, the concentration of the single-stranded DNA is quantitatively detected through analyzing the change of the SPR peak, and the detection limit is ultra-low. The preparation method has the advantages as follows: the instrument and equipment are low in cost, the cost is low, the operation is simple, the efficiency is high, the precision is high, and the detection limit is ultra-low.

The invention relates to a method for detecting clenbuterol through the combination of a MIT technology and a SPR technology, belonging to the field of clenbuterol detection. The method of the invention comprises: firstly using a thermal polymerization method to prepare a clenbuterol molecular imprinting polymer film on a gold film substrate, removing template molecules with eluent, and obtaining a clenbuterol molecular imprinting sensor chip; then calculating the displacement value Delta Theta of SPR resonance angle resulting from the post-reaction and the pre-adsorption of the clenbuterol standard solution and the sensor chip, and creating a standard curve of negative logarithm of Delta Theta and the concentration value of the clenbuterol standard solution; and finally according to the displacement value Delta Theta of the SPR resonance angle resulting from the post-reaction and the pre-adsorption of the clenbuterol standard solution and the sensor chip, and reading the corresponding clenbuterol content on the standard curve. The method of the invention has the characteristics of severe-environment-resistance, high selectivity, fast response and simple operation, not only improves the sensitivity and limit of detection of the method, but also correspondingly reduces the detection cost, and also almost has no adsorption to salbutamol having similar structure with clenbuterol.

The invention relates to a device of realizing the interference photolithography of a maskless surface plasma body through a laue mirror. The device comprises a precision turntable capable of adjusting the incident light angle, a rectangular dove prism capable of coupling and exciting the surface plasma body interference, a compressing device capable of compressing a substrate and the rectangular dove prism, and a support capable of fixing the compressing device. One side face of the rectangular dove prism is fixed on the precision turntable; a P polarized laser beam reaches the inclined plane in a mode of vertical incidence; and the precision turntable is adjusted finely to determine the real resonance angle for exciting the surface plasma body. The substrate coated with photoresist is arranged on the bottom surface of the prism; and the compressing device is adjusted so as to compress the prism and the substrate. A wide beam reaches the prism in a mode of incidence with the real resonance angle; and the surface plasma body interference and the exposure of the photoresist can be realized on the lower surface of a metal membrane; and the substrate after exposure is taken off. The surface plasma body interference photolithography is realized after the postbaking and development of the photoresist. The device has the advantages of low cost, high working efficiency, a great area of a processed pattern region, convenient assembly and adjustment, and the like. The device also facilitates the study and application of nanometer photon crystals and artificial materials.

The present invention relates to a sensor chip, a preparation method and a use thereof, and belongs to the field of hormone detection analysis. The sensor chip sequentially comprises a glass substrate, a gold film layer, a single molecule alkyl chain layer and a progesterone molecule imprinting polymer film from bottom to top. The preparation method comprises: plating a gold film on a glass substrate, forming a single molecule alkyl chain layer on the gold film, and forming a molecule imprinting polymer film on the single molecule alkyl chain layer to obtain the sensor chip, wherein the molecule imprinting polymer film only provides a response for progesterone molecule. The sensor chip can be used for a surface plasmon resonance sensor to detect progesterone content, wherein the sensor chip absorbs progesterone molecules in a sample during detecting, the resonance angle is changed, and the resonance angle change value is proportional to the sample concentration, such that the progesterone content in the sample can be quantitatively detected based on the resonance angle change. According to the present invention, the molecule imprinting technology is adopted, and the prepared sensor chip provides characteristic of sensitivity, rapidness, accuracy and simpleness during progesterone detection.

The invention relates to a method for detecting testosterone by using a surface plasmon resonance (SPR) sensor and belongs to the technical field of hormone detection and analysis. The method comprises the following steps of: fixing a testosterone molecular imprinted identification sensitive chip in the SPR sensor, performing angle scanning on the chip, and then recording an SPR spectrogram to obtain a resonance angle theta1; recording the SPR spectrogram to obtain the resonance angle theta n corresponding to each standard solution; drawing a standard curve by taking delta theta=theta n-theta1 as a vertical coordinate and taking the concentration of the testosterone standard solution as a horizontal coordinate; and injecting sample solution to be detected into a flow cell, and recording the SPR spectrogram to obtain the resonance angle theta x, and computing delta theta x=theta x-theta1 to obtain the testosterone content according to the delta theta x on the standard curve. The method has the advantages of quick response and high selectivity, wherein the result can be obtained in 5 to 10 minutes generally, and the super low testosterone content can be measured; and the chip of the sensor can be recycled, and the detection cost is reduced.

Improved methodology for monitoring deposition or removal of material to or from a process and/or wittness substrate which demonstrates a negative e1 at some wavelength. The method involves detection of changes in P-polarized electromagnetism ellipsometric DELTA at SPR Resonance Angle-of-Incidence (AOI) to monitor deposition of and/or removal of minute amounts of materials onto, or from, said process and/or witness substrate. The methodology can optionally monitor ellipsometric PSI, and involves simultaneously or sequentially applying non-P-polarized electromagnetism at the same angle of incidence, or electromagnetic radiation of any polarization at a different angle-of-incidence and wavelength to the process or wittness substrate and application of conventional ellipsometric analysis.

The invention discloses an LSPR sensor device based on Ag nanoparticles, which is composed of a compact optical path and a circuit, and the compact optical path adopts a detection method of a resonance angle optical signal, which includes a laser source, a polarizer, a vibrating mirror, a lens group, a reflecting mirror, Hemispherical prism and sample cell; the circuit is composed of photodetector, photoelectric conversion circuit, micropump drive circuit, galvanometer drive circuit, data acquisition card and computer. The angle of the reflected light is changed by rotation, the reflected light is converged by the lens group, and the converged light is reflected to the hemispherical prism through the mirror. When the surface plasmon resonance effect occurs, the light emitted to the photodetector shows a change in strength , through the photoelectric conversion circuit to convert the electrical signal to the computer, the micropump drive circuit controls the sample cell through the linear motor; to realize the sample pumping and pumping out, the photoelectric conversion circuit is connected to the galvanometer through the galvanometer drive circuit.

Provided is a multi-channel biosensor using a biosensor using a surface plasmon resonance capable of measuring the changed resonance angle in real time without additionally scanning an incident angle according to the change of temperature or external environment by including a sensor chip with a plurality of channels arranged on a top surface thereof in parallel, a light source for vertically emitting a beam from a top portion of the sensor chip to a direct bottom portion of the sensor chip, a first lens for defocusing the beam emitted from the light source in the top portion of the sensor chip, a beam splitter for splitting a reflected beam, wherein the reflected beam is obtained by reflecting the beam defocused through the first lens from each channel of the sensor chip and a sensing unit for receiving a parallel component of the beam split in the beam splitter.

The invention provides a terahertz sensor for surface plasma resonance. The terahertz sensor at least comprises a heavily doped semiconductor film comprising a first surface and a second surface opposite to the first surface, an optical waveguide coupling layer formed on the first surface of the heavily doped semiconductor film, a sensing chip which is formed on the second surface of the heavily doped semiconductor film and arranged in a sample channel and is in contact with molecules to be detected, a terahertz quantum cascade laser for emitting terahertz light to the optical waveguide coupling layer, and a terahertz detector for detecting the terahertz light. According to the terahertz sensor, terahertz laser is generated by a laser device, total reflection is generated on the surfaces of the optical waveguide coupling layer and the heavily doped semiconductor film, evanescent waves are generated at an interface, surface plasma waves are generated between the heavily doped semiconductor film and a molecule-sensitive film, and the evanescent waves and the surface plasma waves form resonance by adjusting incident light and resonance angles; the sensor can be used for detecting biomacromolecules at terahertz resonance frequency band.

A method for detecting protein kinase based on surface plasmon resonance comprises the following steps: A, a gold film is used as a sensing layer, the sensing layer, first, is soaked with ethanol, then ultrasonically cleaned, H2 flame is used for annealing on the surface of the gold film; B, the gold film processed by the step A is soaked in a polypeptide P1 solution with an amino acid sequence shown as SEQIDNO:1, then soaked with the gold film in a polypeptide P2 solution with an amino acid sequence shown as SEQIDNO:2, and blown to dry with N2, and sealed storage of the prepared polypeptide P1 and P2-modified sensing gold film is performed at-18 DEG C for standby use; and C, the polypeptide P1 and P2-modified sensing gold film prepared by the step B is put on a SPR (surface plasmon resonance) apparatus, protein kinase flow injection is performed on the sensing gold film, when the sensing gold film is bonded with polypeptides on the surface of the gold film, a new resonance angle is produced, and the size of the resonance angle is a SPR response signal.

The invention belongs to the technical field of photoelectric detections, and provides a detection system and a detection method based on SPR. The system and the method combine a spectrum scanning technique and an angle detection technique or a phase detection technique. Firstly, an SPR resonance angle is obtained by using the angle detection technique or the phase detection technique; a point light source at corresponding position of an array source is lightened while the point light sources at other positions are turned off; then the spectrum scanning technique is used to perform spectrum scanning on the lightened point light source to obtain a spectrum position of an optimum linear area; and the wavelength corresponding to the spectrum position is set as a working wavelength of a spectrum filter. The system and the method realize small-angle and high-precision continuous scanning, make full use of the spectral width of the light source, can prevent dense arrangement of the point light sources in the array source and low utilization of the optical spectrum of the light source, and effectively solve the contradiction between the dense degree of the point light sources in the array source and the scanning angle, thereby reducing product cost and simplifying process.

The invention relates to a double-layer metal waveguide coupling surface plasma resonance chip and a preparation method thereof. The preparation method comprises the steps that a first metal layer isprepared on the bottom surface of a prism, and the thickness of the first metal layer ranges from 8 nm to 50 nm; an insulating layer is prepared on the bottom surface of the first metal layer, the thickness of the insulating layer ranges from 300 nm to 1000 nm, and the refractive index of the insulating layer is smaller than that of the prism; and a second metal layer is prepared on the insulatinglayer, and the thickness of the second metal layer ranges from 8 nm to 30 nm. According to the invention, the SERS signal is greatly enhanced; SERS detection sensitivity is further improved; waveguide coupling SPR is used for exciting SERS, so the SPR resonance angle is small, and the requirement for an excitation device is low; and meanwhile, the penetration depth of an electric field in a detected object is large, a protective layer can be constructed on the surface of a metal layer, and therefore an SPR metal sensing film is better protected.

The invention provides a magnetic field measurement method based on the surface plasma resonance technology, comprising a DC source 1, a copper coil 3, a copper coil 5, a light source 7, a sensing probe 11, a processing circuit 15 and a computer system 17, and characterized by employing a magnetofluid 113 and a gold film 112 to take effect mutually to realize surface plasma resonance. A glass groove 114 is filled with the magnetofluid 113, and upper and lower surfaces are provided with magnetic fields to change resonance angles; and then the intensities of the magnetic fields are changed to change a magnetofluid microstructure to furthermore modulate surface plasma waves. The method can reduce the influence caused by medium loss, and realize magnetic field measurement of 0.0173deg/Oe and 0.054deg/Oe sensitivities respectively in a low magnetic field cope and a high magnetic field scope.

The invention discloses a photonic crystal hydrogen sensor adopting angle independence. A titanium dioxide photonic crystal is prepared on a quartz substrate, the period is adjustable, palladium-based alloy films grow on the two side faces of the photonic crystal respectively, the thickness is adjustable, laser beams enter the photonic crystal at a fixed angle (the angle is usually the photonic crystal resonant angle) after being collimated, the transmission coefficient at the moment is 0%, and the size of palladium is increased after palladium absorbs hydrogen, so that the photonic crystal is stretched, the period is prolonged, the resonance angle is moved toward the large-angle direction, and the transmission coefficient of the incidence angle position can change to 70% or above; compared with a traditional reflecting type hydrogen sensor, sensitivity can be improved by 2-3 magnitude orders.

The invention belongs to the field of biosensors, and particularly relates to a subwavelength grating-based ultra-sensitive refractive index optical biosensor which comprises a quartz substrate, and a gold film, a fluorine-containing polymer Cytop film layer and a grating waveguide layer which are sequentially arranged on the quartz substrate. The grating waveguide layer is a surface relief grating structure made of a silicon nitride material. And a liquid sample to be detected covers the grating waveguide layer. According to the invention, the fluorine-containing polymer Cytop film is inserted between the grating and the metal film, the extremely narrow full width at half maximum of guided-mode resonance is realized, and calculation shows that the thickness of the film is changed, the influence on an incident resonance angle is small, but the full width at half maximum can be greatly improved and is about 0.0005 degrees, and the refractive index change is-4 * 10 <-5 >so that the sensitivity of the sensor can be greatly improved.

The invention relates to an optical scanning galvanometer of super high reflectivity, which is composed of a glass substrate layer and a highly-reflective film deposited and plated on the glass substrate layer. The highly-reflective film is composed of nine film layers, which are sequentially, according to the distance from the glass substrate layer from small to large, a first Al2O3 film layer, an Ag film layer, a second Al2O3 film layer, a first SiO2 film layer, a first high-refractivity material film layer, a second SiO2 film layer, a second high-refractivity material film layer, a third SiO2 film layer, and a third high-refractivity material film layer. The beneficial effects are as follows: the reflection bandwidth and resonance angle are increased greatly while the number of coating layers is reduced; the reflection bandwidth with the reflectivity higher than 99% is up to 300nm; and the effective resonance angle can be 0-80 degrees.