150 results about "Dextrorotatory" patented technology

The invention discloses a high-precision coherent population trapping (CPT) rubidium atom magnetometer, comprising a VCSEL (vertical-cavity surface emitting laser), a calibrating lens, an electrooptical modulator, a lambda/2 wave plate, a polarization splitting prism, a reflector, a lambda/4 wave plate, an ITO heater, an atomic vapor cell, a photoelectric detector, a feedback module, a temperaturecontrol module, a data acquisition module, an upper computer, a circuit control module and a 3.417GHz microwave source. Laser is modulated into left-hand circular polarized light and right-handed circular polarized light which have the same light intensity, the left-hand circular polarized light and the right-handed circular polarized light pass through the atomic vapor cell to generate two CPT signals, the CPT signals are subjected to differential treatment to obtain the Larmor prescession frequency, and finally, accurate measurement to a magnetic field is realized according to the relationbetween the Larmor prescession frequency and the magnetic field intensity. Since a feedback system and the novel atomic vapor cell are added, the magnetometer has the advantages of high precision, high flexibility, low power consumption, small size and the like, and has great significance in terms of biomedicine, physical geography, military detection and the like.

According to the present invention, there are provided a polarization filter and a sensor system. The polarization filter includes a circularly polarized light-separating layer having a cholesteric liquid crystalline phase fixed therein, in which the circularly polarized light-separating layer is a layer which selectively transmits one of the left-hand circularly polarized light and the right-hand circularly polarized light in the specific wavelength band, a λ/4 phase difference layer for light in the specific wavelength band is disposed on one of the surfaces of the circularly polarized light-separating layer, and the λ/4 phase difference layer includes a first phase difference region and a second phase difference region of which slow axis directions are orthogonal to each other. The sensor system includes the polarization filter, a light source which emits light having a wavelength in the specific wavelength band, and a light-receiving element which can detect light having a wavelength in the specific wavelength band. The polarization filter of the present invention can improve the sensitivity of a sensor system using polarized light, and the sensor system of the present invention has high sensitivity and is extremely cost effective.

The invention discloses a preparation method of photo-response type chirality intelligent nanometer particles. The preparation method is characterized by comprising the following steps of: preparing a trichloromethane solution with a repetitive unit concentration of 3*10<-2> mg/mL from a 9,9-dioctylfluorene-azobenzene alternating copolymer, wherein Mn in the 9,9-dioctylfluorene-azobenzene alternating copolymer is equal to 7770 g/mol and the ratio of Mw to Mn is equal to 2.62; uniformly mixing the solution with alcohol the volume of which is the same as that of the solution; and irradiating the mixture for 1-30 minutes by using levorotatory or dextrotatory polarized light so as to obtain left-handed helix or right-handed helix chirality nanometer particles. By using the preparation method provided by the invention, the problems that when the traditional method is adopted to synthesize the polymer chirality intelligent nanometer particles, a chiral reagent is expensive, synthetic steps are complex and the like are solved; the obtained product is alternatively irradiated by the levorotatory or dextrorotatory polarized light, thus the chiral spiral direction of the nanometer particles can be changed, so as to present the good properties of a photo switch.

The invention discloses a method for obtaining levorotatory enantiomer and dexiotropic enantiomer by separation from medetomidine (chemical name: 4-(1-(2,3-dimethylphenyl)-ethyl)-1H-imidazole) of racemate, which comprises the steps of reacting medetomidine racemate with optically active acid so that medetomidine racemate can be converted into salts of diastereoisomer, and then separating the saltsof the diastereoisomer by using a half-dose resolution method so as to obtain single enantiomer with particular optical purity.

A measuring system for measuring the dichroism of the magneto-optical circular polarization with adjustable measuring geometry is provided, whose structure is that: a femtosecond laser excites the white light of the ultra-continuous spectrum, and divides the light by a monochrometer, which forms a monochromatic light whose wavelength can be adjustable. The monochromatic light can polarize through a purified Glan-Taylor prism with the extinction coefficient of 10 <5>; a lantern fly modulator, whose optical axis is 45degree angled with the optical axis of the Glan-Taylor prism to make the light become the circularly polarized light with the alternative variation of the sinistrality and the dextrorotation; a sample, which is put on the center of the cryogenic magnet; The circularly polarized light focuses on the sample, and the reflex reflected from the sample is focuses on the first LED detector; a phase-locking amplifier, whose reference signal is provided by the lantern fly modulator used for testing the difference of light intensity between the sinistrality and the dextrorotation of the circularly polarized light. The invention can not only test the frequency spectrum of the dichroism of the magneto-optical circular polarization of the materials, magnetic density and temperature dependence, but also can test the magnetocrystalline anisotropy of the magnetic semiconductor.

The invention relates to a tree-dimensional measuring system capable of reducing light reflection on the surface of a measured object. The system comprises an image analysis and control system, a projector, and a camera. The image analysis and control system is used to make the projector produce structured light. The projector is used to project the structured light from a first direction to the surface of a measured object so as to form a deformed structured light pattern on the surface of the measured object. The image analysis and control system is further used to acquire the deformed structured light pattern from a second direction through the camera and analyze the deformed structured light pattern in order to acquire depth information of the surface of the measured object. The system is characterized in that the projector includes a first circular polarizer; structured light passes through the first circular polarizer to form circularly-polarized structured light which is projected to the surface of a measured object; a second circular polarizer is mounted at the front end of the lens of the camera; the second circular polarizer is used to eliminate the non-circularly-polarized light portion in the light entering the camera; and the first circular polarizer and the second circular polarizer are left-handed circular polarizers or right-handed circular polarizers.

A multilayered cholesteric liquid crystal which comprises at least one light reflection layer (Xa) that is a light reflection layer obtained by fixing a cholesteric liquid-crystal phase and that contains a dextrorotatory chiral agent having an HTP of 30 μm-1 or more and at least one light reflection layer (Xb) that is a light reflection layer obtained by fixing a cholesteric liquid-crystal phase and that contains a levorotatory chiral agent having an HTP of 30 μm-1 or more, all of the light reflection layers (Xa) and all of the light reflection layers (Xb) having a selective-reflection wavelength in the range of 400-750 nm and the selective-reflection wavelength of at least one of the light reflection layers (Xa) being equal to the selective-reflection wavelength of at least one of the light reflection layers (Xb), and in which all the adjoining light reflection layers obtained by fixing a cholesteric liquid-crystal phase have been superposed so as to be in contact with each other. In the multilayered cholesteric liquid crystal, dextrorotatory and levorotatory, inversely twisted, cholesteric liquid-crystal layers have been superposed so as to be in contact with each other without using a pressure-sensitive adhesive therebetween. This multilayered cholesteric liquid crystal has good surface properties and high transparency, selectively reflects light in the visible-light region, and has high reflection performance.

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.

According to the invention, there is provided a circular polarizing filter for selectively transmitting circularly polarized light of any one sense of either right-handed circularly polarized light or left-handed circularly polarized light at a specific wavelength in which scattering transmittance/vertical transmittance when circularly polarized light of the sense of the specific wavelength enters from any one surface is less than scattering reflectance/regular reflectance when circularly polarized light of the other sense enters from the surface. The circular polarizing filter includes a circularly-polarized light separating layer, the circularly-polarized light separating layer includes a reflected light-scattering circularly-polarized light separating layer, and may further include a reflected light-non-scattering circularly-polarized light separating layer, the reflected light-scattering circularly-polarized light separating layer is composed of a layer having a cholesteric liquid crystalline phase fixed therein, and the reflected light-non-scattering circularly-polarized light separating layer is composed of a layer having a cholesteric liquid crystalline phase fixed therein, or a laminate including a linearly-polarized light separating layer and a λ/4 phase difference layer. The circular polarizing filter of the invention has a high circular polarizance, and a high-sensitivity sensor system can be provided using the circular polarizing filter of the invention.

The invention discloses a method and system for generating a polarization state of a high-order Poincare sphere with robustness. The method comprises the following steps of: loading a vortex phase on a completely coherent vector light beam, and then regulating and controlling the completely coherent vector light beam into left-handed circularly polarized light and right-handed circularly polarized light of the high-order Poincare sphere; synthesizing the left-handed circularly polarized light and the right-handed circularly polarized light into vector polarized light on the high-order Poincare sphere, and generating a polarization matrix of the high-order Poincare sphere through adjustment; reducing the spatial coherence of the polarized light, obtaining a random electromagnetic beam through shaping, and extracting polarization information in a polarization matrix to a spatial correlation tensor of the random electromagnetic beam; transmitting a random electromagnetic beam to a far field, in the far field, transferring polarization information from a space correlation tensor to a polarization matrix of the random electromagnetic beam, and obtaining a high-order Poincare sphere polarization state with robust characteristics. The problems that an existing high-order Poincare spherical polarized beam is difficult to generate, does not have the robust characteristic and is easily damaged by the external environment are solved.

The invention provides a full Stokes infrared polarization imager based on a metasurface. The full Stokes infrared polarization imager based on the metasurface can achieve real-time detection and imaging of all polarized light of an infrared band by regulating and controlling the geometrical characteristics and the arrangement mode of a sub-wavelength unit structure. The polarization imager is mainly composed of an ultra-thin single-layer sub-wavelength unit structure array arranged on a substrate layer, sub-wavelength unit structures with different geometric dimensions have different electromagnetic response characteristics on x, y, 45 degrees, 135 degrees, levorotatory circularly polarized light and dextrorotatory circularly polarized light, and independent regulation and control on thesix kinds of polarized light can be achieved. The polarization imager mainly depends on a focal plane polarization imaging mode, six kinds of polarized light can be focused at different positions of the same focal plane at the same time, and when any polarized light irradiates a device, the polarization state of incident light can be calculated through a Stokes vector function. The polarization imager has important application in the field of infrared polarization imaging detection.

The invention relates to a chiral resolution method of tetrabenazine and provides a salt formed by tetrabenazine and dextrorotatory or levorotatory chiral acid and a preparation method thereof. Tetrabenazine racemate is served as a raw material, and the dextrorotatory or levorotatory camphorsulfonic acid and the other chiral acids are served as a resolving agent to simply and efficiently prepare high-purity (+)-(3R, 11bR)-tetrabenazine and (-)-(3R, 11bS)-tetrabenazine.

The invention discloses an ultrathin transmission type terahertz circular polarization asymmetric focusing lens. According to the terahertz focusing lens with the double-layer rectangular metal arraystructure and the thin film substrate, asymmetric focusing of ultrathin transmission type terahertz circular polarization light is realized in a terahertz waveband for the first time; a focus can be generated when right-handed rotation circular polarization is incident from the front face, focusing cannot be achieved when right-handed rotation circular polarization is incident from the back face,the symmetry of the structure is broken through superposition of the two layers of rectangular metal structures, and the function which cannot be achieved by a common lens is achieved. The two layersof metal rectangular array structures are attached to the thin film substrate layer, the thickness is only 25.3 mum, and conversion frequency point adjustment and focal length adjustment can be achieved by adjusting structural parameters and structural rotation angles according to actual application occasions and requirements. The lens has the advantages of low loss, ultra-thinness, small size, easiness in integration and the like; and the focusing lens is simple in structure, wide in material source and convenient to process and prepare.

The invention discloses a method for chiral synthesis of levorotatory menthol. In the process, dextrorotatory pulegone is used as a starting material; catalytic hydrogenation is carried out on the dextrorotatory pulegone by a chiral rhodium catalyst to generate levorotatory menthone; and the catalytic hydrogenation is carried out on the levorotatory menthone by a chiral ruthenium catalyst to synthesize the levorotatory menthol. In the process for synthesizing the levorotatory menthol through an asymmetric synthesis technology, the yield of the levorotatory menthone is more than 90%, the ee value of the levorotatory menthone is more than 99%, the total yield of the levorotatory menthol is greater than 83%, the ee value of the levorotatory menthol is greater than 98%, and the specific rotation is from-49 degrees to -50 degrees. The synthetic process is simple and is suitable for industrial production of the levorotatory menthol in a large scale, and the prepared levorotatory menthol hasthe advantages of high yield, good selectivity, high catalyst activity and other characteristics, is simple to recover.

The present invention provides a composition kit which is suitably used for more convenient production of a bandpass filter with reduced angle dependence, a laminate and a method for producing the same, and a bandpass filter. The composition kit of the present invention includes a first composition containing a liquid crystal compound having a polymerizable group and a dextrorotatory chiral agent, a second composition containing a liquid crystal compound having a polymerizable group and a levorotatory chiral agent, and a third composition containing a color material.

The invention discloses a measurement method for a photon spin-orbital angular momentum joint mode and a measurement system. The measurement method comprises the steps of vertically inputting a to-be-measured optical field with spin-orbital angular momentum into a plane (x, y), and enabling the center of the optical field to be aligned with the center of the plane; introducing phase modulation QL(x, y) into left-handed circular polarization state incident light with a spiral wavefront, and introducing phase modulation QR(x, y) into right-handed circular polarization state incident light with aspiral wavefront; enabling light fields with different spin angular momentum to be expanded along a spiral line and be separated to different positions on a plane (u, v); introducing a compensation phase PL(x, y) into the left-handed circular polarization incident light with the spiral wavefront, introducing a compensation phase PR(x, y) into the right-handed circular polarization incident lightwith the spiral wavefront, and converging the light fields passing through the plane (u, v) at different positions of the plane (m, n); and detecting light intensity distribution of the plane (m, n) to measure a spin-orbital angular momentum joint mode input into the light field or to demodulate the spin-orbital angular momentum joint mode input into the light field.

The invention discloses a preparation process of optically pure Sibutramine. In the process, chiral O,O'-diaryl formacyl tartaric acid is taken as a resolving agent to resolve Sibutramine raceme to obtain diastereomer salt thereof; and the diastereomer salt is separated, alkalized and extracted to obtain optically pure levorotatory Sibutramine or optically pure dextrorotatory Sibutramine. The invention further discloses a preparation process of a salt derivative of the optically pure Sibutramine, and the optically pure Sibutramine obtained by the process is combined with an acid compound to form the salt derivative of the optically pure Sibutramine. The preparation process of the optically pure Sibutramine is characterized by high resolving efficiency, simple and practical process, short resolving cycle and the like; and the used resolving agent can be recovered and recycled. Furthermore, the salt derivative of the optically pure Sibutramine prepared by the invention can expand Sibutramine application scope.

The present invention relates to the use of modafinil in cocaine addiction. The modafinil used is the dextrorotatory enantiomer thereof (modafinil S), having a very rapid release time of less than 1 hour, preferably 15-30 minutes, and very reduced wakefulness-promoting effects of less than 4 hours, preferably less than 2 hours. Said modafinil is to be taken in the form of a pharmaceutical composition via oral administration, each unit dose comprising 25-200 mg, preferably 50-100 mg, of modafinil S. The invention further relates to the use of said pharmaceutical composition as a substitution treatment for cocaine addicts.

The invention discloses a free space type Mueller OCT imaging system for full-automatic time division detection and an imaging method. Four optical channels with different polarization types, namely horizontal type, vertical type, 45-degree linear polarization type and right-handed circular polarization type, are arranged in a reference wall, and meanwhile, a sample wall realizes polarized light of the four states by using a software program to control a rotating wave plate of a precision rotating worktable; a software program is also used in the reference wall to control an optical switch toselect different channels in the reference wall, and polarized light of the channels returns to interfere with the polarized light scattered by the sample wall correspondingly, so that time division detection of polarization information is realized; and meanwhile, 16 element images of a Mueller matrix of a sample are reconstructed, so that the collection of complete polarization information is realized. According to the free space type Mueller OCT imaging system for full-automatic time division detection and the imaging method, full-automatic control is realized, image acquisition can be rapidly carried out, and the sampling rate is improved.

In the prior art, a scanning element used for Lidar in the self-driving car technology employed a mirror or the like continuously rotated by MEMS, and due to the inertia of the mirror or the like, the scanning element was suited for a raster scan that scans a scene in one stroke, but was incapable of discontinuous movement from one arbitrary point to another, and programmable scanning with an arbitrary frequency in an arbitrary pattern, as fast as the raster scan. In the present invention, there was fabricated Lidar, which is composed of a polarization diversity scheme and a scanning element, wherein the polarization diversity scheme uses two polarization gratings, each polarization grating having a thickness such that it becomes a half-wave plate, wherein birefringent directors of each polarization grating rotate with a period Λ, wherein these polarization gratings are disposed with a desired interval from each other, wherein a half-wave plate is inserted in either one of two paths of separated, exiting right-handed or left-handed circularly polarized light beam, depending on a rotation direction of the circularly polarized light, to thereby enable conversion of light beams into parallel proximate circularly polarized light beams with the same rotational direction, and wherein the scanning element has a multistage structure of polarization switch-polarization grating sets connected in combination, with a polarization switch and a polarization grating being defined as one set.

The invention discloses a binocular waveguide display method based on a reflective polarization multiplexing liquid crystal lens. The method is based on a waveguide display device, the waveguide display device comprises an optical waveguide plate, an in-coupling liquid crystal lens, a right-handed out-coupling grating and a left-handed out-coupling grating are arranged at the same side of the optical waveguide plate, and the in-coupling liquid crystal lens is positioned between the right-handed out-coupling grating and the left-handed out-coupling grating. The method comprises the steps that an image source is placed on a focal plane of an in-coupling liquid crystal lens, and the in-coupling liquid crystal lens collimates and couples two kinds of circularly polarized light from the image source into an optical waveguide plate; the left-handed circularly polarized light and the right-handed circularly polarized light are propagated in the waveguide plate in the opposite directions by means of total reflection; and after touching the left-handed-out coupling grating and the right-handed-out coupling grating, the light is diffracted and coupled out of the waveguide. The method solves the problems that in a traditional near-eye waveguide display system, a collimating lens needs to be used, and a gap exists between the collimating lens and the waveguide plate.

The invention relates to a cholesterol liquid crystal display device, comprising a substrate, a light absorption layer and a cholesterol liquid crystal layer. The light absorption layer is arranged on the substrate. The cholesterol liquid crystal layer is arranged above the light absorption layer and comprises a plurality of lines of levorotatory cholesterol liquid crystals and a plurality of lines of dextrorotatory cholesterol liquid crystals which are alternately arranged. The cholesterol liquid crystal display device in the invention respectively reflects a levorotatory light and a dextrorotatory light by virtue of the levorotatory cholesterol liquid crystals and the dextrorotatory cholesterol liquid crystals, thus an observer can see different images with the eyes so as to form 3D development effect.

The invention relates to a synthesis process for fenticonazole nitrate. In the synthesis process, thiophenol and para aminobenzoic acid are taken as raw materials, and are subjected to seven-step reaction to form the fenticonazole nitrate, and the yield is higher. The invention relates to a preparation method for a levorotatory form and a dextrorotatory form of the fenticonazole nitrate, which solves the problem that the levorotatory form and the dextrorotatory form cannot be well obtained due to complicated and fussy operation according to documents. The levorotatory form and the dextrorotatory form have high purity and high industrial application value. Experiments prove that the antibacterial activity of the levorotatory form of the fenticonazole nitrate is greater than that of racemate and the dextrorotatory form. The invention relates to application of the levorotatory form of the fenticonazole nitrate in preparing antifungal medicaments.

The invention discloses a method for synthesizing fosfomycin phenylethylamine calt. The invention relates to the fine chemical field. The method of the invention comprises the following steps: under the condition of stirring, after the hydrogenation reaction is finished, adding 95% mass-content ethanol into the hydrogenation solution in which palladium-carbon catalyst is filtrated; adding sodium bicarbonate saturated solution while stirring; controlling temperature within the range of 30-40 DEG C, then adding DL-alpha-phenylethylamine or D-alpha-phenylethylamine; stirring continuously and adding the aqueous solution of sodium tungstate and EDTA disodium salt; heating the reaction system to 40-50 DEG C and adding hydrogen peroxide, and then heating again till the temperature reaches 50-55 DEG C and maintaining the temperature; cooling to 5 below-10 below DEG C and maintaining the temperature; and washing filter cake with ethanol after filtration and separation, thus obtaining the levorotary-dextrorotatory mixed salts or the crude levorotary salts. The obtained levorotary-dextrorotatory mixed salts are separated to yield crude levorotary salts, and further the crude levorotary salts are refined to form fine levorotary salts. The method has the advantages of simple process, convenient operation, high safety, low material consumption, less pollution discharge, low cost, and short production cycle.