67results about How to "Easy to miniaturize and integrate" patented technology

The invention discloses a scanning-free linear frequency modulation continuous-wave speed measurement and distance measurement laser three-dimensional imaging method and device. An output light beam generated by a linear frequency modulation continuous laser light source of a radar platform is divided into a local oscillation light beam and a signal light beam; the signal light beam is transmittedto a target and an echo light beam of the target is received; coherent light mixing is carried out on the echo light beam and the local oscillator light beam through a space optical bridge; a balancedetector is used for carrying out parallel balance receiving to obtain an intermediate frequency signal; the intermediate frequency signal is read out by adopting a dual-channel focal plane reading circuit; filtering processing and sampling processing are carried out to obtain sampling data; the sampling data are processed by using a field programmable gate array to realize parallel synchronous measurement of a target distance and a target speed; and then three-dimensional images are constructed respectively by combining an image processor. Therefore, a distance-intensity image containing long-distance target gray information and a spatial three-dimensional geometric position relationship can be obtained and the magnitude and direction of the relative movement radial speed of the radar platform and the target can be obtained at the same time.

In view of the demand of microwave photonics, astronomical spectrometric measurement and parallel optical fiber communication systems for a high-frequency spaced optical frequency comb source, especially the demand for an optical frequency comb source which can be integrated on a chip, the invention provides an optical soliton crystal optical frequency comb generation system and method based on amicro-ring resonator. The system includes a pump laser, an optical amplifier, a polarization controller, an optical frequency comb generator and a temperature controller which are sequentially connected through a single-mode optical fiber. The output wavelength of the pump laser is in accordance with the wavelength of a required optical frequency comb, and the operating wavelength of the optical amplifier is in accordance with the output wavelength of the pump laser. The polarization controller is a polarization controller which can withstand the power of the pump light signal. The optical frequency comb generator includes a package shell, a micro-ring resonator and a temperature regulator. The micro-ring resonator and the temperature regulator are packaged in the package shell. The working temperature of the micro-ring resonator is controlled by the temperature controller which is set outside the package shell and connected with the temperature regulator. The optical soliton crystal optical frequency comb generation system has the advantages of low cost, high reliability and small size.

The invention discloses a polarization diversity double-channel speed and distance measuring coherent laser radar measurement method and device. A laser beam output by a laser source is divided by a first polarization beam splitter into a speed measurement light beam and a distance measurement light beam which are orthogonally polarized; the speed measurement light beam adopts quadrature demodulation coherent homodyne Doppler for laser speed measurement; and the distance measurement light beam uses pseudo-random code high-speed phase modulation for laser distance measurement. The speed and distance of a long-distance target are measured precisely and synchronously by means of polarization diversity, the whole system is small, operation is easy, and the development prospects are good.

The invention discloses a multi-channel high-repetition-frequency large-dynamic-range distance measurement and speed measurement laser radar method and device. A laser light source generates a light beam, the light beam is divided into output light beams of N channels through a beam splitter, broadband linear frequency modulation is carried out on the output light beams of each channel, and then aphase modulator is driven after phase shift of different amplitudes, so that the output light beams of each channel have different time delays; the laser beam is divided into a local oscillation light beam and an emission light beam through a beam splitter; the N transmitting light beams are transmitted to a target in parallel and echo light beams of the target are received, coherent light mixingis carried out on the signals and corresponding local oscillation light beams, intermediate frequency signals containing target distance and speed information are obtained, parallel fast Fourier transform and cross-spectrum processing are carried out on sampling data of the intermediate frequency signals, parallel synchronous measurement of the target distance and speed is achieved, and finally merging output of point cloud images of N channels is achieved through a main control computer. The device can effectively overcome distance measurement ambiguity, and has the advantages of high repetition frequency, large dynamic distance measurement range, high resolution, high precision, high reliability, small size, light weight and the like.

The invention discloses an overvoltage, undervoltage and power-off protection circuit formed by an MOS transistor. The overvoltage, undervoltage and power-off protection circuit comprises an upper limit voltage detection unit, a lower limit voltage detection unit, and a PMOS power switch tube, wherein the upper limit voltage detection unit comprises an NMOS transistor, a PMOS transistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the lower limit voltage detection unit comprises a first resistor and a second resistor connected in series; the third resistor and the fourth resistor are connected in series between the power supply end and the power supply ground; the shared junction point of the third resistor and the fourth resistor is connected with the grid electrode of the NMOS transistor; the fifth resistor and the sixth resistor are connected in series between the drain electrode of the NMOS transistor and the power supply end; the shared connecting end of the fifth resistor and the sixth resistor is connected to the grid electrode of the PMOS transistor; the source electrode of the PMOS transistor is connected with the power supply end; and the drain electrode of the PMOS transistor is connected with the common connecting end of the first resistor and the second resistor. According to the circuit, power supply restart is not caused in undervoltage or overvoltage switch off; and in addition, the circuit is simple in structure, and capable of realizing miniaturization of the power supply, and saving cost.

The present invention provides a method of realizing a bidirectional optical diode and a device of realizing the bidirectional optical diode. The scheme of the present invention is that: two beams of coupling fields which are irradiated oppositely and possess a certain frequency detuning are acted on a thermokalite metal atom steam chest, so that an atomic medium generates the periodic modulation to a refractive index of the probe light, the transmission characteristic of the bidirectional incident probe light is operated and controlled effectively, and a bidirectional optical diode function possessing certain frequency interval and frequency width is realized. A frequency interval depends on the frequency detuning difference between the bidirectional coupling fields, and a frequency width depends on a Doppler effect caused by the random motion of hot atoms. Meanwhile, a pair of coherent pumping fields are introduced, the bidirectional transmission efficiency of an optical diode can be improved effectively, and an isolation ratio is not influenced. The device involved in the present invention is easy to miniaturize and integrate, can form a practical light quantum device, and can be widely used in the research fields, such as the multichannel quantum state storage, the quantum information storage, such as an tunable all-optical control optical switch, an optical reflector, etc., the quantum relay network, etc.

The invention relates to an in-situ detection device for the chlorophyll concentration of water and a detection method of the in-situ detection device. The in-situ detection device and the detection method aim at solving the problems that in an existing device, the excitation light path can be not adjusted, the fluorescence intensity is low, and the fluorescence detection accuracy and sensitivity are low due to scattering generated when water contains lots of impurities. A water sample chamber water inlet device is arranged at the bottom of a quartz water sample chamber, a stainless steel shell is arranged outside the quartz water sample chamber, a detector, a light filter and a focusing lens are arranged over the quartz water sample chamber, a light source, a light source transverse adjustment support, a light source transverse adjustment mechanism and a light source direction adjustment mechanism are arranged on the side face of the quartz water sample chamber, and the detector, the light source, the light source transverse adjustment mechanism and a light source incidence angle adjustment mechanism are connected with a host through wires. The method includes the steps that water background fluorescence signals measured under the off-state of the excitation light source are collected, then water fluorescence signals under the on-state of the excitation light source are collected, and background fluorescence interference is automatically subtracted through operation.

The invention discloses a voice coherent laser radar interception method and device for motion Doppler frequency shift compensation. A laser light source in a radar platform outputs a light beam, andthen a polarization beam splitter divides the light beam into a local oscillation light beam and an emission light beam; the emission light beam is emitted to a target; an echo beam of a target is received; the echo light beam and the local oscillation light beam are coherently received and then transmitted to a data processing unit; the data processing unit calculates Doppler frequency shift generated by relative motion of the radar platform and the target, feeds back a control instruction to a frequency shifter according to Doppler frequency shift information, and adjusts the frequency shiftamount of the local oscillation light beam in the frequency shifter to realize Doppler frequency shift real-time compensation in a motion state; and a phase demodulation and unwrapping algorithm is carried out on the compensated collected new data to obtain voice information in real time. According to the invention, voice can be monitored, the monitoring distance is long, the precision is high, the voice is clear, the whole system is miniaturized, the algorithm is simple, and operation is easy.

The invention discloses a phase modulation distance measurement and speed measurement coherent laser radar method and device. An output light beam is divided into a local oscillation light beam and anemission light beam through a first beam splitter; the emitted light beam is transmitted to a second beam splitter to be divided into a detection light beam and a reference light beam, the detectionlight beam is emitted to a target and an echo light beam is received; the local oscillation light beam is divided into a first local oscillation light beam and a second local oscillation light beam through a third beam splitter; coherent light mixing is carried out on a local oscillator light beam I and an echo light beam to obtain first sampling data; coherent light mixing is carried out on a local oscillator light beam II and a reference light beam to obtain second sampling data, and a field programmable gate array is used for processing the first sampling data and the second sampling data to obtain an echo phase sequence and a reference phase sequence; and the echo phase sequence and the reference phase sequence are processed to respectively obtain the motion vector speed and distance of the target. According to the invention, the hardware requirement of the laser radar can be reduced, high-resolution and high-precision distance measurement and speed measurement are realized, and the whole system is miniaturized and easy to operate.

The invention discloses a method for intensifying a carbon dioxide catalytic hydrogenation reaction. The method for intensifying the carbon dioxide catalytic hydrogenation reaction mainly comprises the following steps that active ingredients having capacity for catalyzing CO2 hydrogenation are loaded on a porous conductive framework to prepare a structural catalyst; the structural catalyst is plugged into a circuit to conduct a current; and the structural catalyst is placed in raw material gas containing CO2 and hydrogen, a power source is turned on to apply the current on the circuit, joule heat generated on the structural catalyst of the current can heat the structural catalyst to a temperature at which CO2 hydrogenation reaction can be carried out, and CO2 and hydrogen react on the structural catalyst. The current is applied on the structural catalyst of the conductive framework to realize electric internal heating, so that the catalyst is heated more uniformly, activity and sulfurpoisoning capacity of the catalyst are improved, and the conversion performance of CO2 is obviously improved.

The invention provides a balance feed sampling receiver. The balance feed sampling receiver comprises a sampling pulse signal generating circuit, a sample integral retaining circuit and a differential amplification circuit, wherein the sampling pulse signal generating circuit is used for shaping a double-end drive pulse signal to generate a pair of balanced picosecond sampling pulse signals, the front end of the sample integral retaining circuit is electrically connected to the sampling pulse signal generating circuit and the input end of a pulse signal to be sampled, the sample integral retaining circuit is used for carrying out downsampling on the pulse signal to be sampled through the balanced picosecond sampling pulse signals and carrying out underclocking and reconstructing on the base band waveform of the pulse signal to be sampled, the front end of the differential amplification circuit is electrically connected to the sampling integral retaining circuit, and the differential amplification circuit is used for carrying out differential amplification processing on the base band waveform of the reconstructed pulse signal to be sampled and obtaining a low-frequency base band signal widened in the time domain. The balance feed sampling receiver can integrally reconstruct the pulse signal to be sampled, the sampling bandwidth is high and adjustable, and the application requirement of an ultra wide band radar system is met.

The invention relates to a wearable vital sign monitoring device. A laser light source of the wearable vital sign monitoring device is used for emitting laser to a sensing optical fiber; two ends of the sensing optical fiber are respectively connected with a laser light source and a photoelectric conversion module; the sensing optical fiber is bent after bearing the pressure of pulse or breathingor heartbeat movement of a human body, and a laser signal transmitted in the sensing optical fiber is lost at a bent part and is modulated based on a bending loss principle; the photoelectric conversion module is used for converting the modulation signal of the laser bending loss output by the sensing optical fiber into an electric signal representing the pulse or breathing or heartbeat movement of the human body; and a vital sign signal extraction module is used for extracting the corresponding human body pulse or breath or heartbeat frequency from the electric signal representing the human body pulse or breath or heartbeat movement. According to the invention, the vital sign information of the human body can be accurately monitored in real time.

The invention discloses a DC / DC power input overvoltage and under-voltage protection device composed of a voltage-stabilizing tube, and the device comprises a low threshold circuit, a high threshold circuit, a first switching circuit, and a second switching circuit. An input voltage is inputted to the low threshold circuit and the high threshold circuit, and is compared with the threshold values of the low and high threshold circuits, thereby achieving the respective control of the on / off of the first and second switching circuits. When the input voltage is within the range between the two threshold values of the low and high threshold circuits, an isolation switch power supply works normally. When the input voltage is outside the range between the two threshold values of the low and high threshold circuits, the power Vdd of a power controller is lowered to be less than a starting voltage of the power controller, and the isolation switch power supply does not work. Through the arrangement of two voltage-stabilizing values, the input overvoltage and under-voltage protection thresholds of the isolation switch power supply are arranged, thereby saving the cost, and facilitating the miniature integration of a DC-DC power supply. The device irons out the defect that the range of the input voltage is limited, and is wider in the range of a design voltage.

The invention provides a full-electronic-control two-dimensional light beam scanning device. The device comprises a laser, a one-dimensional waveguide phased array, a cylindrical lens, an MEMS reflector and a control chip. The one-dimensional waveguide phased array is used for generating a one-dimensional first scanning light beam from an incident laser beam through the phased array. The first scanning light beam is shaped by the cylindrical lens and then reflected to a free space by the MEMS reflector, the MEMS reflector rotates around an axis, and the one-dimensional waveguide phased array and the MEMS reflector are electrically connected to a control chip to control a second scanning light beam emitted from the MEMS reflector to realize full-space two-dimensional scanning. According tothe two-dimensional light beam scanning device provided by the invention, the one-dimensional phased array and the MEMS reflector are integrated in a mixed manner, and full-space two-dimensional scanning of laser beams is realized. Compared with a traditional two-dimensional phased array system, the device has the advantages that the laser cost is saved, the workload of a control chip is reduced,the power consumption of the chip is reduced, the heat dissipation pressure is relieved, and miniaturization and integration of the system are facilitated.

The invention discloses an optical microscopic imaging method and device, and belongs to the field of optical microscopic imaging. The optical microscopic imaging method specifically comprises the steps that a display screen sequentially displays a strip image sequence; sequentially displayed strip images form a moving illumination strip on a sample surface through an objective lens; a sample areailluminated or excited by the moving illumination strip is imaged to a detector through the objective lens; and image sequences obtained by imaging are superimposed to obtain complete image of the sample. The optical microscopic imaging device comprises a small display screen, a lens, a filter, a splitter, an objective lens and a surface array detector. In the imaging process, the width of an illumination area and the width of a detection area are simultaneously limited, the illumination process and the detection process are synchronized, a line scanning and confocal imaging mode is formed, and the restraining ability of small microscope imaging for out-of-focus signals is improved; and the small display screen is utilized, thereby not requiring the application of a mechanical scanning element, being convenient for the miniaturization and integration of a microscope system, and being applicable to performing living body in-situ microscopic imaging on the biological process.

A tunable multi-wavelength multiplexing spectrum modulation and separation system for high-power fiber laser amplification comprises a narrow linewidth seed source, a wavelength division multiplexing module, a spectrum modulation module, a first pre-amplifier, a wavelength separation module, a second pre-amplifier, a main amplifier and an end cap. The spectrum modulation module injects an electrical signal and adopts a tunable filter and a variable attenuator, so that the tunable spectrum line width can be realized, and the system has important application value in many different fields. According to the multi-wavelength common spectrum modulation broadening and separation system, multi-wavelength beam combination and high-precision and high-signal-to-noise-ratio separation can be achieved within the wave band range of 1.0 micrometer or 2.0 micrometers, meanwhile, the same inhibition effect on stimulated Brillouin scattering in multi-wavelength laser high-power optical fiber amplification is achieved, the consistency is shown in laser output power improvement, and the system has the advantages of being high in integration degree, simple in structure, convenient to control and particularly low in manufacturing cost, and miniaturization integration, array expansion and application of large-scale laser array synthesis are greatly facilitated.

The invention provides a three-degree-of-freedom motion motor driven by liquid mass suspension bionic electromagnetic, and relates to the technical field of three-degree-of-freedom motion motors. The motor adopts a built-in or output shaft structure; the rotor is a hollow spherical shell, and the hollow part can place a wireless transmission device and a visual image acquisition device; the inner surface of the rotor shell is provided with a permanent magnet in a vertical direction; the stator has a shape corresponding to the rotor shape. The adapted inner cavity is provided with a number of stator coils on the surface of the inner cavity, and the inner cavity of the stator is provided with stator permanent magnets in a vertical direction that are compatible with the permanent magnets; the rotor is supported in a liquid suspension manner. The invention adjusts the deflection of the motor rotor by controlling the direction and amplitude of different coils, which can realize the suspension operation, and has the advantages of simple structure, small volume, small friction, fast response, strong dynamics, and can approach the real situation to a large extent. The advantages of eye and easy miniaturization and integration; with the help of multi-dimensional motion actuator and control technology, practical visual bionics can be realized.

The invention discloses a power buffer diode chip structure and a manufacturing method thereof. The power buffer diode chip structure structurally comprises a lower metal layer, a substrate and an epitaxial layer, the lower metal layer, the substrate and the epitaxial layer are laminated from bottom to top in sequence, a deep diffusion area is formed on the epitaxial layer, a well area is formed on the deep diffusion area, a shallow-layer diffusion area is formed on the well area, a channel resistance area is formed on the well area and is connected with the deep diffusion area and the shallow-layer diffusion area, the conducting type of the epitaxial layer and the well area is the same as that of the substrate, and the conducting type of the shallow-layer diffusion area and the deep diffusion area is opposite to that of the substrate; another electrode of a power buffer diode is arranged on the shallow-layer diffusion area, a medium layer is arranged on the connection part of the shallow-layer diffusion area and the resistance area, and metal is arranged on the connection part of the deep diffusion area and the well area. Through the semiconductor structure, multiple components and parts in a circuit are integrated in the same chip, so that the manufactured semiconductor device is small in size, the miniature integration is promoted, and the cost is low.

The invention discloses a simple light guide switching circuit which comprises a phototransistor, an amplifier, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, wherein the two ends of the resistor R1 are connected with a base and a collector of the phototransistor respectively; the collector of the phototransistor is connected with a power supply, and an emitter of the phototransistor is grounded through the resistor R2; after the resistor R3 is connected in series with the resistor R4, a common end is grounded; the other common end is connected with the collector of the phototransistor; an input end of the amplifier is connected with the emitter of the phototransistor; and another input end of the amplifier is connected between the resistor R3 and the resistor R4. The circuit has the advantages that the circuit is high in control sensitivity and simple, and facilitates miniature integration.

The invention provides a circuit protection device which comprises a gas discharge tube and a third electrode, wherein the gas discharge tube is at least provided with two electrodes, namely a first electrode and a second electrode; and the third electrode is movably connected with the second electrode through a bimetallic strip. When the working temperature exceeds a normal temperature, the bimetallic strip deforms to make the third electrode perform conductive disconnection with the second electrode. The circuit protection device can have a function of discharging a lightening current or overvoltage when subject to lightning stroke and surge overvoltage, and provide overvoltage protection for a follow-up circuit; besides, when the circuit protection device undergoes a certain continuous power frequency current or excessive power frequency current and undergoes temperature rise to an overturning point of the bimetallic strip due to heating, the circuit protection device is open-circuited due to the overturning of the bimetallic strip and provides overcurrent protection for the follow-up circuit.

The invention discloses a power supply input overvoltage undervoltage shutdown controller protection circuit including an upper limit voltage detection unit, a lower limit voltage detection unit and a controller power supply unit. When the power supply input voltage exceeds the set upper limit voltage, a NMOS transistor in the upper limit voltage detection unit is switched on, the supply voltage of the controller power supply unit is decreased to zero and thus a power controller does not operate and no power is output. When the power supply input voltage is lower than the set lower limit voltage, a PMOS transistor in the lower limit voltage detection unit is switched off and the supply voltage of the controller power supply unit is decreased to zero and thus the power controller does not operate and no power is output. When the power supply input voltage is between the lower limit voltage and the upper limit voltage, the power is output normally. The power supply circuit is controlled to be switched on or off by the two MOS transistors, and the power supply input overvoltage undervoltage shutdown controller protection circuit is simple in structure, beneficial to the miniaturization of a DC-DC power supply, low in cost and high in reliability, and does not restart a power supply when undervoltage or overvoltage shutdown.

The invention discloses a Ka-frequency-range radio frequency sending method. The method comprises the following steps: performing frequency mixing on first processing signals by use of first local oscillator signals; performing second processing on the first processing signals after the frequency mixing to obtain third processing signals; performing the frequency mixing on the second processing signals by use of frequency multiplication signals of the first local oscillator signals; and after performing third processing on the second processing signals after the frequency mixing, outputting the second processing signals in the form of Ka-frequency-range signals. The invention simultaneously discloses a Ka-frequency-range radio frequency receiving method. The method comprises the following steps: performing two-order low-noise amplification processing on receiving signals; performing frequency mixing with the receiving signals after low-noise amplification by use of second harmonics of local oscillator signals to obtain intermediate-frequency signals; and after performing bandpass filtering on the intermediate-frequency signals, outputting the intermediate-frequency signals.

The invention relates to a CO2 and N2O stable isotope simultaneous detection device and method based on a double-beam cavity enhanced spectrum technology. The device comprises a signal generator, a QCL laser I, a QCL laser II, a QCL laser controller I, a QCL laser controller II, a plane mirror assembly I, a plane mirror assembly II, an integral cavity, a focusing lens, an MCT detector and a signalprocessing system. According to the invention, a stable and efficient double-beam cavity enhanced optical path system is realized, the two QCL lasers working at room temperature are combined, the miniaturized atmospheric CO2 and N2O multi-component stable isotope dynamic efficient detection device is constructed; according to the double-beam cavity enhanced spectrum structure, a beam-combining optical coupling element does not need to be added, power fluctuation and loss caused by a traditional coupling optical element are avoided, the hardware cost of the system is reduced, integration of the detection device is facilitated, and in-situ real-time detection of the isotope abundance of the multi-component gas can be achieved.

The invention discloses a distributed multi-channel voice coherent laser radar interception method and device. A light beam of a laser light source in a radar platform is divided into N output light beams through a 1*N beam splitter, and N is greater than or equal to 2; frequency shift is carried out on each output light beam through a frequency shifter, and the output light beam is divided into alocal oscillation light beam and an emission light beam through a 1*2 beam splitter; the emitted light beams are directionally emitted to a target through beam control to form an array topological structure, the echo light beam of the target is received, N echo light beams and the corresponding local oscillation light beams are subjected to coherent receiving to obtain N signal data, the N signaldata are transmitted to a digital signal processing system, and the data processing system obtains high-definition voice information through demodulation and enhancement of the voice information. Multiple pieces of sound source information can be flexibly obtained through an array topological structure formed by multiple output light beams, and the system has good spatial selectivity, and also has the characteristics of strong anti-noise interference capability, long interception distance, high precision and clear voice.

The invention discloses an integrated waveguide-coaxial-microstrip transition structure which comprises a microwave box body, an insulator and a waveguide cover plate. A circuit groove is formed in the top surface of the microwave box body in a depth direction to install a microwave circuit, and the cover plate is arranged above the circuit groove; an end face groove is formed in one end face of the microwave box body, an end face waveguide cavity is formed in the end face groove, an external waveguide port is formed at the corresponding position above the end face waveguide cavity, namely the top face of the microwave box body, and waveguide mounting holes are formed in the two sides of the external waveguide port; the insulator is transversely arranged between the end face waveguide cavity and the circuit groove, one end of the insulator extends into the end face waveguide cavity, and the other end of the insulator is electrically connected with the microwave circuit in the circuit groove, and the waveguide cover plate is tightly matched with the end surface groove. According to the present invention, a main cavity is formed through one-time machining, and the waveguide cavity and the microwave box body are manufactured on one structural part, so that the machining and manufacturing are convenient and fast; the requirement for alignment between the waveguide cover plate and the microwave box body is low, and the performance deterioration caused by the matching precision problem of the waveguide cavity and the microwave box body is avoided.

A sensor for identifying at least one particle by means of Raman-spectroscopy, comprising an optical trapping system for the at least one particle, including a laser-beam source, acting further as a Raman excitation source for the at least one particle, and a Raman-spectrometer for measuring the spectrally modified light scattered by the at least one particle and for identifying same, wherein the optical trapping system comprises a photonic crystal directly linked with the laser-beam source, which photonic crystal has multiple cavities at predetermined positions, and wherein the laser-beam source in use resonantly excites one or more predetermined electromagnetic modes of the cavities at said positions for trapping and Raman-exciting the at least one particle.

The invention provides a manufacturing method of a surface plasma lens. The manufacturing method of the surface plasma lens comprises the steps that a substrate is provided; a metal membrane layer with the certain thickness is formed on the upper surface of the substrate; the upper surface of the metal membrane layer is etched to form a main annular groove; the bottom surface of the main annular groove is etched to form an auxiliary annular groove which is formed in the circumferential direction of the main annular groove, wherein the ring center connecting line of the main annular groove and the auxiliary annular groove is perpendicular to the upper surface of the metal membrane layer, the outer diameter of the main annular groove is larger that that of the auxiliary annular groove, and the bottom end face of the auxiliary annular groove is higher than the lower surface of the metal membrane layer. The manufacturing method solves the problems that in the prior art, for improving efficiency, a surface plasma lens is complex in structure and large in size. The surface plasma lens is simple in structure, small in size and beneficial to small-type integration, and the manufacturing method is simple.

A sensor for identifying at least one particle by means of Raman-spectroscopy, comprising an optical trapping system for the at least one particle, including a laser-beam source, acting further as a Raman excitation source for the at least one particle, and a Raman-spectrometer for measuring the spectrally modified light scattered by the at least one particle and for identifying same, wherein the optical trapping system comprises a photonic crystal directly linked with the laser-beam source, which photonic crystal has multiple cavities at predetermined positions, and wherein the laser-beam source in use resonantly excites one or more predetermined electromagnetic modes of the cavities at said positions for trapping and Raman-exciting the at least one particle.

The invention belongs to the technical field of semiconductor packaging, and relates to a binary array optical fiber coupling structure of a balanced photoelectric detector and a manufacturing method, and the coupling structure adopts a lead-tin welding technology to weld a binary array optical fiber in a metal tube shell; the metal tube shell comprises a metal sleeve and a metal cavity, and the metal sleeve is embedded in the wall of the metal cavity in a penetrating mode. The binary array optical fiber comprises two optical fibers, a metal nickel tube, a sleeve and two optical fiber connectors, the two optical fibers are jointly fixed in the metal nickel tube by adopting a gold-tin welding process, one ends of the two optical fibers are exposed out of the metal nickel tube, the other ends of the two optical fibers are respectively connected with the optical fiber connectors, and the sleeve wraps the two optical fibers and is connected with the metal nickel tube; the binary array optical fiber is fixed in the metal sleeve, and the metalized end of the binary array optical fiber is coaxially aligned with the photosensitive surface of the chip in the metal cavity; according to the invention, double-fiber coupling can be realized at one time, and the coupling process difficulty is reduced; the coupling packaging size can be reduced, and miniaturization packaging of the photoelectric detection module can be balanced.

The invention provides a method and device for realizing a bidirectional optical diode. The invention scheme is as follows: two oppositely incident coupling fields with a certain frequency detuning act on the hot alkali metal atom vapor chamber, so that the atomic medium periodically modulates the refractive index of the probe light, so that the two-way incident probe The transmission characteristics of light are effectively manipulated, realizing the function of a bidirectional optical diode with a certain frequency interval and frequency width. Doppler effect. Simultaneously introducing a pair of coherent pump fields can effectively improve the bidirectional transmission efficiency of the optical diode without affecting its isolation ratio. The device involved in the invention is easy to miniaturize and integrate, and forms a practical optical quantum device, which is widely used in multi-channel quantum state storage, quantum information storage such as tunable all-optical control optical switches, optical mirrors, and quantum relay networks. field.