192 results about "Evanescent wave" patented technology

The invention discloses a surface plasmon resonance imaging system for expanding a dynamic range through a multi-mode optical path, and relates to the technical field of microscopic imaging, a laser outputs a monochromatic and linearly polarized continuous wave beam, a first dynamic beam deflection device performs dynamic angle deflection adjustment on the continuous wave beam, a prism is used for providing a total reflection interface, and a second dynamic beam deflection device is used for performing dynamic angle deflection adjustment on the continuous wave beam. Exciting an evanescent wave; a surface plasma resonance effect is generated through interaction of the SPR detection chip and evanescent waves, and sample characteristics are detected; the flow cell provides a sample flow channel, so that a sample is in full contact with the surface of the SPR detection chip; the second dynamic light beam deflection device cooperatively adjusts the propagation direction of reflected light on the surface of the SPR detection chip, and the imaging detection device captures a high-spatial-resolution SPR image formed by the reflected light and transmits the image to the upper computer in real time for processing and analysis. According to the invention, the change of the resonance angle can be tracked in real time, and high-sensitivity and high-resolution monitoring of the dynamic process of biomolecule interaction is realized.

An antenna module includes an antenna unit and a first isolation unit. The antenna unit includes a first antenna and a second antenna arranged at an interval. The first isolation unit is arranged between the first antenna and the second antenna and configured to convert a transmission form of an electromagnetic wave coupled into the first isolation unit from the first antenna and / or the second antenna into an evanescent wave, to isolate a target signal between the first antenna and the second antenna.

The present application relates to a kind of method and kit for detecting methylation cysteine total amount, belong to the field of biotechnology and analytical test.Utilize nucleic acid aptamer with high response to free Hcy, with moderate corresponding state Hcy to construct evanescent wave optical fiber sensor.Complementary strand and tHcy of fluorescently labeled are combined with the nucleic acid aptamer fixed on optical fiber with competition.Fluorescence signal drop value is positively correlated with tHcy concentration in serum.According to the percentage of fluorescence reduction, the tHcy concentration in serum is calculated.The present application detects tHcy only needs 1 microliter serum, after diluting 1000 times, detection is carried out, and the detection result is consistent with commercial enzyme cycle method.Compared with enzyme cycle method, the present application has the advantages of low price, optical fiber can be reused more than 30 times, detection speed is fast, fastest 5 minutes, does not need enzyme, equipment miniaturization, simple operation, etc., has excellent clinical application value.

This application provides a self-injection-locked narrow-linewidth laser with a quasi-continuous locking region, comprising: a semiconductor laser source for generating an initial linewidth laser and outputting it via end-face coupling; a photonic integrated microcavity chip including a bus waveguide and a microring resonator coupled to it via an evanescent wave, for receiving the initial linewidth laser and providing feedback light to the semiconductor laser through Rayleigh backscattering of the microring resonator to excite a self-injection-locking effect; the microring resonator is a compact folded waveguide microcavity with an ultra-low free spectral range, the free spectral range of which is less than a preset threshold, so that when the driving current of the semiconductor laser is changed for wavelength tuning, the self-injection-locking regions of adjacent resonant modes in the cavity physically overlap or are closely spliced ​​in the current tuning parameter space, so that the semiconductor laser can continuously transition between adjacent modes without experiencing permanent unlocking during continuous current tuning, forming a quasi-continuous locking region.

The invention relates to the field of optical fibers, in particular to a D-type optical fiber based on Fe3GaTe2 nanosheets and a preparation method and application of the D-type optical fiber. The invention discloses a D-type optical fiber based on a Fe3GaTe2 nanosheet. The D-type optical fiber comprises a D-type optical fiber and a Fe3GaTe2 layer deposited on a D-type plane of the D-type optical fiber. By utilizing the evanescent field characteristic of the D-type optical fiber, the Fe3GaTe2 nanosheet is deposited on the D-type plane of the D-type optical fiber, and magnetic anisotropy change (such as magnetization direction switching) is generated under the action of an external magnetic field, so that the effective refractive index of the optical fiber is changed; the change is converted into an optical path difference in the Michelson interferometer. Finally, the magnetic field intensity can be inverted by measuring the FSR change of the interference spectrum. The room-temperature MA adjustability of the Fe3GaTe2 nanosheets provides a larger refractive index change range (superior to that of magnetic fluid), and the nanosheets are not easy to degrade, so that the D-type optical fiber has higher sensitivity and temperature performance.

The present application relates to a kind of based on micro-nano fiber and scattering medium substrate coding element and speckle spectrometer.The coding element includes sealed cavity, micro-nano fiber and scattering medium substrate;Including drawstring transition zone and waist zone in the body of micro-nano fiber, drawstring transition zone forms leaky mode, waist zone generates evanescent field, the body of micro-nano fiber penetrates sealed cavity, so that drawstring transition zone and waist zone are located in sealed cavity;Scattering medium substrate is fixed in sealed cavity, and the waist zone of micro-nano fiber is overlapped on scattering medium substrate, scattering medium substrate is used to receive evanescent field and is coupled leaky mode to obtain scattering pattern information;Wherein, in the direction parallel to waist zone, scattering medium substrate includes more than two scattering zones, and the light transmittance of each scattering zone is different, and the difference between maximum light transmittance and minimum light transmittance is 20%~80%.Speckle spectrometer using the coding element of the present application has the advantages of small size, low cost while high spectral resolution.

The application provides a visual micro-nano optical waveguide refractive index sensing system, and a hardware part comprises a nano fiber taper coupled fluorescent doped polymer microwire; the nano fiber taper coupled fluorescent doped polymer microwire is coupled by a nano fiber taper and a fluorescent doped polymer microwaveguide; the nano fiber taper is obtained by adopting a flame tapering method from a standard single-mode optical fiber; the fluorescent doped polymer microwaveguide is directly prepared by wire drawing from a mixed solution doped with a fluorescent dye; the nano fiber taper and the fluorescent doped polymer microwaveguide placed in a channel of an optical substrate jointly form an evanescent wave coupling structure; a signal analysis part enhances, edge extracts, smoothes and peak extracts a fluorescent image of the microwire through an image analysis algorithm, obtains an oscillation period of a fluorescent light path in the microwire under a current environment, establishes a response relationship between the light path period and the environmental refractive index, realizes direct real-time obtaining of environmental change conditions from optical images of a sensing unit shot by a camera, and thus obtains the change of the refractive index.

The application discloses a kind of optical fiber humidity sensor and its preparation scheme, optical fiber humidity sensor includes micro-nano optical fiber and porous film;Wherein: the micro-nano optical fiber, at least one bending part is formed;The porous film is coated on the surface of the bending part;The porous film surface has a plurality of holes, which is configured to be able to swell by water absorption, so that the duty cycle of hole becomes smaller.The present application utilizes the evanescent field of U-shaped micro-nano optical fiber to couple with the porous film to realize humidity sensing.Under different relative humidity environment, the size of the hole of the porous film on the surface of the U-shaped micro-nano optical fiber is different, so that the size of the energy scattered by it is different, and the change of the optical power at the output end of the optical fiber is different, thereby realizing humidity sensing.The present application has the advantages of high sensitivity, fast response speed, high repeatability and stability.

The invention discloses a surface plasma-based reverse Cherenkov medium laser accelerator, which is characterized in that a silicon medium prism, a first silver metal film, a first silicon medium film, a high-vacuum particle channel, a second silicon medium film, a second silver metal film and a silicon medium substrate are sequentially arranged from top to bottom to form a seven-layer metal-medium alternating structure; single-side incident laser excites surface plasma to realize particle acceleration. Incident electromagnetic waves are subjected to total internal reflection at the bevel edge of the prism, evanescent waves are generated, the longitudinal wave vector component of the evanescent waves meets the excitation condition of SPPs at the medium-metal layer interface, then the SPPs are excited on the metal-medium interface, and a remarkably enhanced near field is generated. The enhanced electric field forms longitudinal accelerating fields which are symmetrically distributed in the high-vacuum particle channel, and energy gain is continuously provided for electrons; meanwhile, the transverse electric field component is minimized in the central area of the channel due to mutual offset of upper and lower components, so that particle deflection is effectively inhibited.

This application discloses a fiber optic fluorescence level sensor based on evanescent waves, relating to the field of fiber optic sensing. The sensor includes: a light source module that outputs excitation light, which is sent to a fiber optic sensing unit to generate a fluorescence signal; a transmission fiber responsible for bidirectional signal transmission; a fiber optic sensing unit comprising a fiber optic strip D-groove structure, an encapsulation structure, a sensitive material, and a floating piston. The piston divides the encapsulation structure into two sections: the lower section contains the liquid to be measured, and the upper section integrates the sensitive material and the fiber optic strip D-groove structure. The piston floats synchronously with the liquid surface, changing the effective contact area between the sensitive material and the fiber optic strip D-groove structure, causing a regular change in the fluorescence intensity excited by the evanescent wave; a fiber optic spectrometer to acquire wavelength-intensity spectral information; and a computer module to perform data visualization, achieving real-time liquid level monitoring based on changes in fluorescence intensity. This sensor can improve upon the problems of existing fiber optic level sensors, such as complex fabrication, high cost, limited range, high equipment requirements, and poor adaptability to harsh environments.

A laser lithotripsy system may include a light energy source and a catheter. The catheter may comprise an optical fiber comprising a core and a cladding that encases the core. The optical fiber may be configured to be optically coupled to receive laser light from the light energy source. The optical fiber may include at least one evanescent portion and at least one non-evanescent portion. When light propagates through the core, an evanescent field may be transmitted out of the optical fiber in the evanescent portion and may not transmitted out of the optical fiber in the non-evanescent portion.

Optical states in TIR-based image displays may be modulated by movement of electrophoretically mobile particles into and out of the evanescent wave region at the interface of a high refractive index convex protrusions and a low refractive index medium. The movement of particles into the evanescent wave region may frustrate TIR and form dark states at pixels. Movement of particles out of the evanescent wave region may allow for TIR of incident light to form bright states at pixels. The movement of the particles may be controlled by employing the drive methods of pulse width modulation, voltage modulation or a combination thereof.

The embodiment of the invention relates to an optical assembly of an integrated waveguide and an optical chip. According to some embodiments of the present application, a waveguide-integrated optical assembly includes: a first waveguide having a first end; the second waveguide is provided with a second end and is parallel to the first waveguide, and the second end of the second waveguide is coupled with the first end of the first waveguide; the optical device is located in the second waveguide, and the surface of at least one of the first end of the first waveguide and the second end of the second waveguide is gradually shrunk in the tail end direction so that light can enter the second waveguide from the first waveguide in an evanescent wave coupling mode. Another embodiment of the invention provides an optical chip. The optical chip comprises one or more optical assemblies. The optical assembly of the integrated waveguide and the optical chip provided by the embodiment of the invention can effectively solve the problems encountered in the traditional technology.

Implantable devices and / or sensors can be wirelessly powered by controlling and propagating electromagnetic waves in a patient's tissue. Such implantable devices / sensors can be implanted at target locations in a patient, to stimulate areas such as the heart, brain, spinal cord, or muscle tissue, and / or to sense biological, physiological, chemical attributes of the blood, tissue, and other patient parameters. The propagating electromagnetic waves can be generated with sub-wavelength structures configured to manipulate evanescent fields outside of tissue to generate the propagating waves inside the tissue. Methods of use are also described.

The application provides a photoelectric detector and a manufacturing method thereof, the photoelectric detector comprising: a waveguide arranged on a substrate and composed of a first material; and a light absorption layer arranged on a surface of the waveguide; the light absorption layer comprises a first material part and a second material part, the first material part is provided with a recess part, the second material part is arranged in the recess part, the first material part is composed of the first material, the second material part is composed of a second material, and the refractive index of the first material is smaller than that of the second material for the light of the predetermined wavelength. According to the application, the light absorption layer of the photoelectric detector is arranged in a structure formed by alternately arranging two materials with different refractive indexes, thereby increasing the absorption rate of the evanescent wave in the absorption layer, and high responsivity and high bandwidth are achieved.

The invention provides an optical waveguide and heterojunction two-dimensional material integrated nonvolatile storage structure and an application method, and relates to the technical field of photoelectron integration. A heterojunction two-dimensional material layer is arranged in an evanescent field area of an optical waveguide layer, so that when an electric field pulse is applied to the heterojunction two-dimensional material layer through a positive electrode layer and a negative electrode layer, the heterojunction two-dimensional material layer is not subjected to evanescent field pulse; the heterojunction two-dimensional material layer can generate various non-volatile heterojunction polarization states, so that the optical constant and the optical state of the non-volatile storage structure are changed, the optical state can be stored by utilizing the non-volatility, and the optical memory function is realized. Even under the condition of power failure, the stored optical state cannot be lost, and ultra-low static power consumption can be realized. The overturning of the polarization state of the heterojunction is realized by the overturning of the heterojunction domain, so that the power consumption of the nonvolatile storage structure is far lower than the heat power consumption required by a phase change memory or a thermo-optic device.

The invention provides an on-chip optical sensor for medical detection and a manufacturing method thereof, and relates to the technical field of on-chip optical sensors. According to the scheme, the device mainly comprises a substrate, a double-peak waveguide interference structure, a near-infrared photoelectric detector and a micro-fluidic channel, the double-peak waveguide interference structure is arranged on the upper surface of the substrate, comprises a waveguide layer and is used for amplifying refractive index change and outputting an interference signal; the micro-fluidic channel and the near-infrared photoelectric detector are respectively arranged in a sensing area and an output area on the upper surface of the waveguide layer; recognition molecules are arranged in the micro-fluidic channel and are used for being specifically combined with target molecules of a medical sample and generating refractive index change; and the near-infrared photoelectric detector is used for reading the interference signal and converting the interference signal into an electric signal. According to the scheme, the machinable absorption layer is directly integrated in the evanescent field area of the double-peak waveguide, on-chip direct reading of waveguide interference signals is achieved, coupling loss is reduced, and the signal-to-noise ratio is remarkably increased.

The invention discloses a high-responsivity photoelectric detector using an air cavity, which is characterized in that a dilution waveguide, the air cavity and a photoelectric detector are integrated on a semi-insulating substrate, and the air cavity is obtained in a dilution waveguide layer in an etching and wafer bonding mode; and finally, the transition waveguide and the photoelectric detector table are etched according to a conventional technological process. When the photoelectric detector works, the vast majority of signal light incident from the side surface is gradually coupled to the active region under the guidance of the dilution waveguide in front of the air cavity, and the leakage of the light from the active region to the dilution waveguide and the semi-insulating substrate below is effectively inhibited due to the large refractive index difference between the air cavity and the surrounding material; most of the light is limited in the active area and is converted into an electric signal after being absorbed by the absorption layer. According to the air cavity structure, the penetration depth of evanescent waves at the interface of the dilution waveguide and the air cavity can be reduced, the concentration degree of light in an active area is effectively improved, and the responsivity of the photoelectric detector is improved.

The invention relates to the technical field of gas concentration detection, in particular to a gas concentration sensor based on a resonant cavity, a preparation method of the gas concentration sensor and a detection system. The gas concentration sensor based on the resonant cavity comprises a microcavity which comprises an input end, a first Bragg grating and a second Bragg grating which are arranged in sequence; the input end is configured to receive a laser light source; the first Bragg grating and the second Bragg grating are symmetrically arranged, and the periodicity and the etching depth of the first Bragg grating and the second Bragg grating are the same; the resonant cavity is located between the first Bragg grating and the second Bragg grating; the gas chamber covers the second Bragg grating, and gas to be detected is contained in the gas chamber; the output end is coupled with the microcavity in an evanescent field mode, and the output end is configured to output an optical signal corresponding to the gas to be detected. The resonant cavity-based gas concentration sensor provided by the embodiment of the invention is simple in structure and simple in preparation process, and the detection precision of gas concentration can be improved.

The invention relates to the technical field of optical detection, and discloses a super-resolution optical detection system and method for material surface defects. According to the system and the method, a structured evanescent wave field is formed on the surface of a plasmon evanescent wave chip to serve as a near-field illumination probe, the relative position of the probe and a sample is changed through non-mechanical scanning modes such as angle or wavelength tuning, and a group of far-field polarization resolution diffraction patterns are acquired by a diffraction signal acquisition module. And the central control and data processing unit performs iterative computation by adopting a vector coherence diffraction imaging algorithm based on the diffraction data set, and reconstructs complex amplitude distribution of the probe and a high-resolution Jones matrix image of the sample at the same time. By analyzing the Jones matrix, quantitative detection of the morphology, the size and the anisotropic physical attributes of the surface defects can be completed. According to the invention, vibration caused by mechanical scanning is avoided, and high-stability and high-resolution nondestructive testing is realized.

The invention discloses a nano-cavity sensor for efficiently exciting fluorescence. The nano-cavity sensor comprises a quartz substrate layer, a micro-lens layer and a metal film layer which are sequentially arranged from bottom to top, the micro-lens layer is located above the quartz substrate layer and comprises a plurality of spherical-table-shaped micro-lenses protruding upwards; and the metal film layer is positioned on the quartz substrate layer and the micro lens layer, and is provided with through nano holes which are in one-to-one correspondence with the centers of the top planes of the table-shaped micro lenses. When exciting light enters, the spherical table type micro lens can focus a light beam emitted into the lens cavity from the bottom to the bottom of the nanopore to form a zero-mode waveguide effect, and fluorescent substances in the nanopore are excited through an evanescent field. The spherical table type micro lens modulates the direction of an excitation light beam, the light beam is converted into local enhanced excitation from parallel incidence, modulation of excitation photoelectric magnetic field distribution at the bottom of a nanopore and in a nanocavity in a solution environment is achieved, and distribution of an electromagnetic field is described by using a caustics line. According to the device, the excitation efficiency of a light path system on fluorescence is remarkably improved.

The present application relates to the technical field of optical fiber sensor, more particularly, to a kind of acoustic wave sensor based on micro-nano fiber evanescent field coupling and preparation method thereof, the purpose of the present application is to provide acoustic wave sensor with low cost, demodulation simple, photoelectric system compatibility good many aspects of advantages.The acoustic wave sensor of the present application includes substrate, transducer diaphragm, thin film modulation layer and bipyramidal micro-nano fiber;Substrate is provided with through hole, transducer diaphragm is pasted on the upper surface of substrate;Thin film modulation layer is pasted and fixed on the upper surface of transducer diaphragm, bipyramidal micro-nano fiber is fixed on thin film modulation layer, the waist region of bipyramidal micro-nano fiber is suspended above transducer diaphragm, and the position corresponds with through hole, coupling modulation space is formed between the waist region of bipyramidal micro-nano fiber and transducer diaphragm.The present application also provides a kind of method for preparing the acoustic wave sensor.

The invention provides a waveguide light collecting switch unit and an array thereof, the waveguide light collecting switch unit comprises a first bus waveguide, a second bus waveguide and a light switch structure, bridge waveguides, the first bus waveguide and the second bus waveguide are arranged in a one-to-one correspondence mode and combined to form a waveguide set with L > 1 light transmission paths, and in the waveguide set, L is larger than 1. The bridge waveguides operate synchronously under the action of the driving part, and switching of evanescent field coupling states of optical signals in the L optical transmission paths is achieved. According to the invention, through the waveguide set with L > 1 optical transmission paths, the device can be well adapted to an interface with a plurality of optical transmission paths, and has the advantages of simple control, large port density and high optical signal transmission capability; and the waveguide light-collecting switch array formed by combining the waveguide light-collecting switch units can also realize the function of any routing between the input port and the output port.

The embodiment of the invention relates to an optical assembly of an integrated waveguide and an optical chip. According to some embodiments of the present application, a waveguide-integrated optical assembly includes: a first waveguide having a first end; the second waveguide is provided with a second end and is parallel to the first waveguide, and the second end of the second waveguide is coupled with the first end of the first waveguide; the optical device is located in the second waveguide, and the surface of at least one of the first end of the first waveguide and the second end of the second waveguide is gradually shrunk in the tail end direction so that light can enter the second waveguide from the first waveguide in an evanescent wave coupling mode. Another embodiment of the invention provides an optical chip. The optical chip comprises one or more optical assemblies. The optical assembly of the integrated waveguide and the optical chip provided by the embodiment of the invention can effectively solve the problems encountered in the traditional technology.

The invention relates to the technical field of optics, and discloses a broadband circular polarization terahertz source and application thereof, and the broadband circular polarization terahertz source comprises a free electron beam moving along a predetermined direction and a stacked bianisotropic metasurface located above the free electron beam; wherein the stacked bianisotropic metasurface comprises at least two layers of metal gratings which form a stacked structure; the at least one dielectric plate is used for separating the metal grating; wherein the number of layers of the dielectric plate is one less than that of the metal grating; and the metal grating and the dielectric plate form a periodic structure together, and are used for coupling evanescent wave energy of the free electron beam into multiple resonant modes so as to excite broadband circular polarization terahertz radiation. According to the technical scheme provided by the invention, the tunable and compact terahertz source with high power output can be realized.

The invention provides a cold atom control platform. The platform comprises a waveguide and a gold film, wherein the gold film is located below the waveguide; the gold film is used for enhancing an evanescent field above the waveguide; the waveguide comprises a first dielectric body, a second dielectric body and a third dielectric body; the second medium body and the third medium body are communicated with the same end of the first medium body to form a first transmission channel and a second transmission channel; and the first transmission channel and the second transmission channel are used for bidirectionally transmitting red detuned light and unidirectionally transmitting blue detuned light so as to control cold atom transmission.

The invention provides a novel micro-structure polymer optical fiber tetracycline sensor based on C3N4-MIL-53 sensitive material modification, which can realize low-cost, high-sensitivity and rapid detection of tetracycline concentration in water. The optical fiber probe is characterized in that the optical fiber probe is composed of a side-cast area and a microgroove area, and the surface of the side-cast area is sequentially coated with a layer of Canadian resin and a C3N4-MIL-53 sensitive film. Through the microgroove structure, most of light transmitted by the optical fiber can be concentrated in a specific angle range for transmission, so that the intensity of evanescent waves is effectively enhanced, and the sensitivity of the sensor is improved. The C3N4-MIL-53 sensitive material is adopted for modification, and the specific adsorption effect of the C3N4-MIL-53 sensitive material on tetracycline is utilized, so that the rapid, high-sensitivity and high-selectivity detection function of the sensor on the concentration of tetracycline in water is realized.

The application discloses a D-type double-core PCF-SPR refractive index sensor and a detection system, belongs to the technical field of optical fiber sensing, and is characterized in that a core single hole is arranged in the center of a PCF cladding, a hexagonal outer air hole is arranged outside the core single hole, two symmetrical polishing surfaces are polished on both sides of the PCF cladding area and a micro channel is formed in the center, and an Au layer and a TiO2 layer are sequentially arranged at both ends outside the polishing surfaces. The polishing surfaces are coated with a sensitizing material, the SPR effect of the sensor can be enhanced, the design that the polishing surfaces are polished on both sides and a micro channel is formed in the middle and the existence of the core single hole make the evanescent wave generated by the fiber core and the Au-TiO2 coated on the polishing surface form a double-core coupling effect, and the SPR effect is more remarkable. It is verified that the RI identification range of the sensor is 1.26-1.41, the refractive index sensitivity is as high as 24,600 nm / RIU, and therefore the sensor has a good application prospect in the fields of environmental detection, medical diagnosis and biochemical sensing.

The invention discloses a compact all-metal high-gain filtering yagi antenna based on evanescent wave coupling, and belongs to the technical field of evanescent wave antennae, the compact all-metal high-gain filtering yagi antenna comprises a driving unit, a reflector, a connecting device and a coaxial probe, one end of the coaxial probe is located in the driving unit, and the other end of the coaxial probe penetrates through the bottom side of the driving unit and is located on the outer side of the driving unit; the connecting device is located between the driving unit and the reflector, and the two ends of the connecting device are connected with the driving unit and the reflector respectively. By means of the structure, the all-metal design is adopted, and the miniaturized high-gain design is achieved based on the evanescent wave coupling mechanism and the working principle of the yagi antenna; meanwhile, the antenna also has all-metal characteristics and out-of-band filtering response, and is suitable for miniaturized high-gain antenna design in high-power communication application.