38 results about "Magnetic circular dichroism" patented technology

The invention provides an all-medium ultrathin two-dimensional circular polarization dichroic device and a preparation method thereof, for realizing the effects of directly generating circularly polarized light and distinguishing left and right rotation circularly polarized light. The structure comprises a substrate and a Z-shaped through hole which covers the substrate and is etched in a medium layer. According to the invention, the average circular dichroism of a polarizer at a waveband of 1.50[mu]m to 1.61[mu]m is more than 70%, the circular dichroism at a waveband of 1.53[mu]m can reach 98.3% to the maximum degree, and the all-medium ultrathin two-dimensional circular polarization dichroic device has the advantages of quite wide waveband, simple structure and easy manufacturing, and thereby having a quite large application value in future optical sensing systems, advanced nanometer photon devices and integrated optical systems.

The invention discloses a method for high-sensitivity detection of silver ions through circular dichroism, belonging to the technical field of analytic chemistry. The method comprises the following steps: respectively coupling gold nanoparticles with two different grain sizes and two specific nucleic acids rich in a cytosine (C) sequence to obtain AuNPs10nm-DNA1 and AuNPs25nm-DNA2, adding silver ions to cause AuNPs10nm-DNA1 and AuNPs25nm-DNA2 to generate C-Ag<+>-C mispairing identification, reducing through trisodium citrate, reacting AuNPs10nm-DNA1, AuNPs25nm-DNA2 and silver ions under the liquid environment to form a binary assembly so as to form plasma chirality, and causing the gold nanoparticles to generate a circular dichroism CD signal in a visible region. The CD signal intensity in the liquid environment is measured through the circular dichroism so as to measure the content of the silver ions. According to the invention, reaction is only performed in the liquid environment, a step of cleaning is unnecessary, one-step reaction is only required, the reaction condition is simplified, the sensitivity of detection is improved, and the leading level in the world is achieved.

The invention discloses a method for detecting L-cysteine concentration by applying of a circular dichrorism, and belongs to the technical field of analytical chemistry. The L-cysteine and a reagent are mixed according to a certain volume ratio to generate self-assembly and form gold nanoparticle dimer, reactant is placed on a circular dichroism analyzer, signal strength at 525nm position of a main wave is detected, and therefore the concentration of the L-cysteine is measured. Compared with a traditional instrument, under a liquid environment, AuNPs and the L-cysteine are utilized to react to form the gold nanoparticle dimer, the chirality of the L-cysteine can be enlarged through the form of a binary assembly, and a CD signal is produced by the gold nanoparticle diamer in a visible region. The contents of the L-cysteine are measured by a manner that the CD signal intensity under the liquid environment is measured through the circular dichrorism. The method only can be carried out under the liquid environment, and a step of washing is not needed. Only one step of reaction is needed, reaction conditions are simplified, and sensitivity of detection is improved.

The present invention proposes a low-temperature sample manipulator for soft X-ray magnetic circular dichroism (XMCD), comprising: a wiring cavity with an upper end and a lower end; an XYZ three-dimensional mobile stage installed on the XMCD ultra-high vacuum cavity, and the The lower end of the wiring cavity is installed on the XYZ three-dimensional mobile platform; the liquid nitrogen cooling device is connected to the upper end of the wiring cavity and passes through the XYZ three-dimensional mobile platform; the copper cold head is fixed on the liquid nitrogen The lower end of the cooling device; the sample rack is installed at the lower end of the copper cold head and is insulated from the copper cold head; wherein, the liquid nitrogen cooling device is injected with liquid nitrogen to cool the samples on the sample rack. The low-temperature sample manipulation table suitable for soft X-ray magnetic circular dichroism absorption spectrum proposed by the embodiment of the present invention realizes cryogenic refrigeration of liquid nitrogen to the greatest extent on the premise of insulation, non-magnetism and high vacuum.

A reflection surface 12 constituted by a transition metal having a core level absorption edge in the vicinity of a wavelength of a soft X-ray is formed on an inside of a vacuum vessel 14, and furthermore, there is provided a permanent magnet 13 for generating a magnetic field in a perpendicular direction to a longitudinal direction of the vacuum vessel 14 in a position of the reflection surface 12 by which the soft X-ray is to be reflected, and the soft X-ray to be linearly polarized light incident on the vacuum vessel 14 is reflected at plural times over the reflection surface 12 in a position where the magnetic field is applied in such a manner that magnetic scattering is increased by a resonant effect of a magnetic circular dichroism when the soft X-ray is reflected by the reflection surface 12. Thus, a great difference in a refractive index is made between circularly polarized counterclockwise light and circularly polarized clockwise light which constitute the linearly polarized light, and a phase difference between the circularly polarized counterclockwise light and the circularly polarized clockwise light is obtained at a time. Consequently, it is possible to reversibly convert the soft X-ray from the linearly polarized light into the circularly polarized light or from the circularly polarized light into the linearly polarized light by a reflection to be carried out at only several times.

The invention discloses a circular polarization dichroic super lens and a light path system comprising the same. The super lens comprises a substrate and a surface structure; the surface structure comprises a metal layer and a plurality of spiral surface structures arranged in an array, the metal layer is formed on the spiral surface structures, and the plurality of spiral surface structures are arranged on the substrate. The range of the rotation angle of the plurality of spiral surface structures along the radial direction is 0-360 degrees, and the phase of the left-handed circularly polarized light and the right-handed circularly polarized light passing through the super lens can realize full-phase delay. The super lens of the embodiment of the invention can provide a new idea for realizing the combined function of focusing imaging and circular dichroism for a single device, and has great application prospect in the aspects of chiral sensing measurement, imaging, display, biologicaldetection and the like.

The invention relates to the technical field of micro-nano opticals and specifically relates to a micro-nano metal structure for realizing circular dichroism and application thereof. The circular dichroism of the micro-nano metal structure provided by the invention is dynamically adjusted through adjustment of a space g between a vertical body I and a vertical body II and coupling degree between two L-shaped structures of the micro-nano metal structure is changed through utilization of a size of the space g between the vertical body I and the vertical body II, so the circular dichroism is dynamically adjusted. Conventional circular dichroism adjustment is mainly realized in a coupling mode in a height direction, so structure preparation is complex and a requirement for an experiment condition and a detection instrument is very high. According to the micro-nano metal structure for realizing the circular dichroism provided by the invention, operation for adjusting a circular dichroism signal is simple and convenient and is easy to realize. A new thought for dynamic adjustment of a planar circular dichroism signal is provided.

An optical parameter measuring apparatus for measuring optical parameters of an object includes a light source, a polarizing module, a Stokes polarimeter and a calculating module. The light source emits a light which is polarized by the polarizing module and received by the Stokes polarimeter. According to the light information generated by the Stokes polarimeter, Mueller matrixes of linear birefringence, circular birefringence, linear dichroism, circular dichroism and linear / circular depolarization of the object, and Stokes vector established according to the Mueller matrixes, the calculating module calculates the optical parameters.

The invention discloses a system for synchronously measuring a polar magneto-optic Kerr spectrum and a magnetic circular dichroism spectrum, comprising a liquid helium refrigerator, a low-temperature superconducting magnet system, a super-continuous white light source, a monochromator, a chopper, two Glan-Taylor prisms, a photoelastic modulator, a broadband depolarizing beam splitter prism, an achromatic lens, a silicon detector, three lock-in amplifiers and a computer. With the system provided by the invention, the polarized magneto-optic Kerr (KERR) spectrum and the magnetic circular dichroism (MCD) spectrum of a sample can be simultaneously measured, so that the magnetism, as well as energy band structure and properties related to spinning of substances can be further studied.

The invention relates to a device and a method for detecting circular dichroism. A laser having a wavelength in a visible light region is modulated into left circularly polarized light and right circularly polarized light, so that the modulated chiral light passes through transparent microspheres having a super-resolution imaging capability to irradiate a chiral molecular film; The focusing capacity of the transparent microspheres to the light increases an absorption difference between the left circularly polarized light and the right circularly polarized light by chiral molecules and is detected by a lock-in amplifier, thereby achieving an aim of reducing a detection limit of the circular dichroism; and meanwhile, the super-resolution capability of the transparent microspheres is used toidentify adjacent chiral molecular clusters, which can detect chiral substances more effectively. Compared with a conventional technology, the device and the method can realize fast, accurate and non-invasive detection of the chiral molecules and enhance detection signals, and have the advantages of convenience in operation, low sample consumption, no contact damage to biological samples and maintenance of original biological characteristics of the chiral substances.

The invention relates to the field of micro-nano optics, in particular to a double-F-shaped nanopore array and a method therefore for regulating and controlling circular dichroism. The double-F-shapednanopore array is spliced by a plurality of metal nano unit structures according to a rectangular period array; each metal nano unit structure is manufactured by a rectangular metal nano film; and acentrosymmetric double-F-shaped nanopore is formed in the middle of the rectangular metal nono film. Since left and right rotation polarized light is irradiated on the structure, generated electric field strengths are different so as to cause big circular dichroism, and the maximum circular dichroism is 41%. In addition, the invention puts forward the method for regulating and controlling circulardichroism on the basis of the double-F-shaped nanopore array. By use of the method, a vanadium dioxide phase change material is arranged in the structure to change the temperature of the environmentwhere the structure is positioned to regulate and control circular dichroism. The method is simple and feasible, saves resources and is easy in operation.

The invention relates to a single-layer three-bending hole naofilm with strong absorbing circular dichroism and a preparation method thereof. The single-layer three-bending hole nanofilm is obtained through combining a plurality of same nanometer units in a vertical direction and a left-and-right direction. Furthermore the three-layer three-bending hole nanofilm has a single-layer chiral structure. The cross section of the nonometer unit is a square. The nanometer unit is provided with a three-bending hole which has a chiral characteristic. Furthermore the length direction of the three-bendinghole is parallel with the side of the square. The preparation method of the single-layer three-bending hole nanofilm comprises steps of baking after glue application, baking after image development and image fixation, performing vacuum coating, and performing air drying after soliquid generation. Compared with an existing preparation method for a three-layer or two-layer nanofilm, the preparationmethod realizes simpler preparation. Furthermore the single-layer three-bending hole nanofilm realizes strong absorbing circular dichroism. Furthermore signals are distributed in a visible light waveband, thereby facilitating signal detection.

An optical parameter measuring apparatus for measuring optical parameters of an object includes a light source, a polarizing module, a Stokes polarimeter and a calculating module. The light source emits a light which is polarized by the polarizing module and received by the Stokes polarimeter. According to the light information generated by the Stokes polarimeter, Mueller matrixes of linear birefringence, circular birefringence, linear dichroism, circular dichroism and linear / circular depolarization of the object, and Stokes vector established according to the Mueller matrixes, the calculating module calculates the optical parameters.

The invention provides a design of soft X-ray wave-band high-phase difference, high-optical flux, wide-wave band phase shifting piece that adopts multilayer film structure, not only having higher optical flux and polarization degree as well as wider bandwidth but also having simple manufacturing process, and as used, convenient to regulate. The invention introduces the design of the phase shifting piece and a concrete preparing method, as well as the calculated optical performance of the wide-band phase shifting piece, etc. It can be applied to many polarization measuring fields such as soft X-ray magnetic circular dichroism (MCD) and magnetic linear dichroism (MLD) analysis, soft X-ray resonance magnetic dispersion, etc.

The invention relates to an absorption circular dichroism adjustable structure. The structure comprises a plurality of structure units arranged periodically, wherein each structure unit comprises a substrate, a first metal nanorod and a second metal nanorod; a rear side face of the first metal nanorod is adjacent to a front side face of the second metal nanorod; the first metal nanorod inclines leftwards, and the second metal nanorod inclines rightwards; and the substrate is arranged at the right side of the second metal nanorod. The absorption circular dichroism adjustable structure is simplein structure, simple in manufacturing technologies and convenient to make in large scale, has excellent circular dichroism, can improve circular dichroism to about 20%, makes circular dichroism moreoutstanding, and lays the foundation of application of the circular dichroism.

The invention relates to the technical field of micro-nano optics, and specifically relates to a planar micro-nano structure capable of producing circular dichroism. The planar micro-nano structure comprises unit structures, wherein each unit structure comprises a rectangular strip and a U-shaped structure, the rectangular strip and the U-shaped structure are in the same plane, the U-shaped structure comprises a first arm, a second arm and a connection bar, the first arm and the second arm are parallel, the first arm and the second arm are respectively connected with two ends of the connectingbar, the rectangular strip is at one side of the U-shaped structure and is parallel to the first arm, and both the rectangular bar and the U-shaped structure are made of precious metal materials. Therectangular strip is arranged at one side of the U-shaped structure, electric charge distribution on the surface of the U-shaped structure is regulated through a coupling role of the rectangular strip and the U-shaped structure, so as to absorb left polarized light and right polarized light differently, therefore, an electric dipole and a magnetic dipole are generated, a specific circulation pattern is formed, and then a large circular dichroism signal is generated.

The invention provides an adsorption contact type thermal-sensitive alarm. The adsorption contact type thermal-sensitive alarm comprises a temperature controller capable of directly contacting to feel the surface temperature of an object, a magnetic circular ring mounted on the temperature controller and a shell mounted above the magnetic circular ring; the shell is internally provided with a buzzer and a button battery; and after the adsorption contact type thermal-sensitive alarm is adsorbed on a surface with metal of a pot cover, the surface temperature of the pot cover reaches a relatively constant highest value when dishes in a pot are boiled, and a temperature control point set by the temperature controller is reached so that an alarming circuit of the buzzer is switched on and the buzzer makes sounds to realize the alarming and reminding effect. On the basis of not changing existing kitchenware, a small tool is additionally arranged, so that the effect of alarming and reminding a boiled state of the dishes is convenient to realize, and people who cook the dishes can conveniently do various types of things.

This invention relates to a device for calibrating circular or linear dichroism spectrometers, or other photoelastic modulator (PEM) based devices or instruments. In preferred embodiments, the present invention features a device for calibrating circular dichroism or linear dichroism spectrometers comprising at least one waveplate (Q) providing (n±¼) waves of retardation at a defined set of wavelengths, and at least one isotropic plate (P). The invention also features methods for using the device, for example, for calibrating circular dichroism spectrometers or linear dichroism spectrometers.

A reflection surface 12 constituted by a transition metal having a core level absorption edge in the vicinity of a wavelength of a soft X-ray is formed on an inside of a vacuum vessel 14, and furthermore, there is provided a permanent magnet 13 for generating a magnetic field in a perpendicular direction to a longitudinal direction of the vacuum vessel 14 in a position of the reflection surface 12 by which the soft X-ray is to be reflected, and the soft X-ray to be linearly polarized light incident on the vacuum vessel 14 is reflected at plural times over the reflection surface 12 in a position where the magnetic field is applied in such a manner that magnetic scattering is increased by a resonant effect of a magnetic circular dichroism when the soft X-ray is reflected by the reflection surface 12. Thus, a great difference in a refractive index is made between circularly polarized counterclockwise light and circularly polarized clockwise light which constitute the linearly polarized light, and a phase difference between the circularly polarized counterclockwise light and the circularly polarized clockwise light is obtained at a time. Consequently, it is possible to reversibly convert the soft X-ray from the linearly polarized light into the circularly polarized light or from the circularly polarized light into the linearly polarized light by a reflection to be carried out at only several times.

The invention relates to a circular dichroism spectrum and refractive index measuring system based on linear polarized light incidence. Wide-spectrum continuous light emitted by a super-continuous light source passes through a first lens and is adjusted to obtain parallel light, and the parallel light is modulated through an adjustable polarizer into linear polarized light, wherein the linear polarized light and a one-dimensional period metal groove structure form a first angle; after the linear polarized light is emitted into a to-be-measured chiral sample attached to the surface of the one-dimensional period metal groove structure, transmission light is focused by a second lens to be collected by a spectrograph; the adjustable polarizer is further adjusted, and the parallel light is modulated into linear polarized light, wherein the linear polarized light and the one-dimensional period metal groove structure form a second angle, and the second angle and the first angle are oppositely symmetrical; then after the linear polarized light is emitted in the to-be-measured chiral sample, the transmission light is focused by the second lens to be collected by the spectrograph; according to the transmission spectrums collected twice, a circular dichroism spectrum single and the refractive index of the to-be-measured chiral sample can be calculated and obtained. According to the circular dichroism spectrum and refractive index measuring system, a test method is simple; as adopted elements are universal components, the whole machine cost of the system is quite low, and the system has the quite large popularization value.

The invention relates to the technical field of micro-nano optics, in particular to a planar micro-nano structure for realizing circular dichroism. The planar micro-nano structure comprises an L-shaped frame structure and a metal plate structure. The L-shaped metal frame structure is arranged at the upper part of a metal plate and is connected with the metal plate; and magnetic fluid is arranged in a metal groove formed by the metal plate and a metal frame. According to the planar micro-nano structure, a transmitted circular dichroism signal can be generated; the maximum value can reach 10%; and the independent L-shaped frame structure does not have the circular dichroism signal. And the magnetic fluid is arranged in the L-shaped gold groove and the magnetic fluid changes the refractive index by changing the intensity of the magnetic field under the magnetic field, so that the circular dichroism signal of the magnetic fluid can be dynamically regulated and controlled.

The invention discloses a method for measuring weak magnetic La 1‑x Sr x MnO 3 In the method of layered magnetic structure of epitaxial thin film, a large magnetic field is first applied to cool down and magnetize the film, and then a weak reverse magnetic field disturbance is applied, and the La 1‑x Sr x MnO 3 The layered magnetic structure characteristics of epitaxial films, and the strength of magnetic moment exchange coupling between different layers. The method is simple and efficient, and the obtained test results can be used to analyze the distribution direction of the layered structure of the film, the magnetic inhomogeneity caused by the strain inside the film and the non-uniform rotation of the magnetic moment. Methods such as electron holography, magnetic circular dichroism and polarized neutron reflectance have obvious test advantages.

The invention discloses a method for detecting L-cysteine concentration by applying of a circular dichrorism, and belongs to the technical field of analytical chemistry. The L-cysteine and a reagent are mixed according to a certain volume ratio to generate self-assembly and form gold nanoparticle dimer, reactant is placed on a circular dichroism analyzer, signal strength at 525nm position of a main wave is detected, and therefore the concentration of the L-cysteine is measured. Compared with a traditional instrument, under a liquid environment, AuNPs and the L-cysteine are utilized to react to form the gold nanoparticle dimer, the chirality of the L-cysteine can be enlarged through the form of a binary assembly, and a CD signal is produced by the gold nanoparticle diamer in a visible region. The contents of the L-cysteine are measured by a manner that the CD signal intensity under the liquid environment is measured through the circular dichrorism. The method only can be carried out under the liquid environment, and a step of washing is not needed. Only one step of reaction is needed, reaction conditions are simplified, and sensitivity of detection is improved.

The invention discloses a system for synchronously measuring a polar magneto-optic Kerr spectrum and a magnetic circular dichroism spectrum, comprising a liquid helium refrigerator, a low-temperature superconducting magnet system, a super-continuous white light source, a monochromator, a chopper, two Glan-Taylor prisms, a photoelastic modulator, a broadband depolarizing beam splitter prism, an achromatic lens, a silicon detector, three lock-in amplifiers and a computer. With the system provided by the invention, the polarized magneto-optic Kerr (KERR) spectrum and the magnetic circular dichroism (MCD) spectrum of a sample can be simultaneously measured, so that the magnetism, as well as energy band structure and properties related to spinning of substances can be further studied.

A circular dichroism (CD) spectrometer includes an alignment mechanism that automatically adjusts the elements thereof at appropriate positions. The spectrometer has a focusing-lens position-and-orientation adjustment mechanism which adjusts the position and the orientation of the detector-side focusing lens. It also has a detector rotation mechanism which adjusts the orientation of the detector. Firstly, a control PC monitors the CD spectrum of D form of optical enantiomers, and the adjustment mechanism adjusts the focusing lens such that the monitored CD spectrum matches the reference spectrum related to the D form. Next, the control PC moniters CD spectrum of L form of optical enantiomers, and the adjustment mechanism adjusts the focusing lens such that the monitored CD spectrum of the D and L forms become symmetrical. And, the rotation mechanism adjusts the orientation of the detector such that the intensity of the detector signal is maximized.

The invention relates to a method for measuring the spin polarizability of a magnetic material. The method comprises the following steps that the actual movement speed vexp of a magnetic domain wall of the magnetic material is measured under the action of pulse current Iexp by using an in-situ Lorentz transmission electron microscope test technology; the theoretical movement speed vthe of the magnetic domain wall of the same magnetic material under the action of the complete spin polarization current Ithe is calculated through micro-magnetic simulation, and the spin polarizability P of the magnetic material is calculated through comparison between actual data and theoretical data. Compared with a traditional spin polarizability testing method utilizing synchrotron radiation and magnetic circular dichroism, the method is simpler and more convenient, and a more convenient technical method is provided for analyzing spin polarizability of a novel magnetic material in the future.

The invention discloses a chiral metal nanostructure realizing circular dichroism and a preparation method thereof. The preparation method comprises performing evaporation of A and B materials in a rotating alternative manner according to a clockwise or anti-clockwise direction on a template with polystyrene pellets as a substrate, to form an AB alternative helical structure, wherein the A is an insulator material and B is a metal material. Through measurement of light normal incidence and / or oblique incidence, the chiral metal nanostructure is proved to have relatively high circular dichroism. The technical scheme is simple in operation, and more accurate in measuring signals. The chiral metal nanostructure can be applied in biological monitoring, enantiomer sensing, polarization conversion, and photoelectronic circuit polarizers.

The invention discloses a method for high-sensitivity detection of silver ions through circular dichroism, belonging to the technical field of analytic chemistry. The method comprises the following steps: respectively coupling gold nanoparticles with two different grain sizes and two specific nucleic acids rich in a cytosine (C) sequence to obtain AuNPs10nm-DNA1 and AuNPs25nm-DNA2, adding silver ions to cause AuNPs10nm-DNA1 and AuNPs25nm-DNA2 to generate C-Ag<+>-C mispairing identification, reducing through trisodium citrate, reacting AuNPs10nm-DNA1, AuNPs25nm-DNA2 and silver ions under the liquid environment to form a binary assembly so as to form plasma chirality, and causing the gold nanoparticles to generate a circular dichroism CD signal in a visible region. The CD signal intensity in the liquid environment is measured through the circular dichroism so as to measure the content of the silver ions. According to the invention, reaction is only performed in the liquid environment, a step of cleaning is unnecessary, one-step reaction is only required, the reaction condition is simplified, the sensitivity of detection is improved, and the leading level in the world is achieved.