121 results about "Optical integration" patented technology

Nanoribbons and nanowires having diameters less than the wavelength of light are used in the formation and operation of optical circuits and devices. Such nanostructures function as subwavelength optical waveguides which form a fundamental building block for optical integration. The extraordinary length, flexibility and strength of these structures enable their manipulation on surfaces, including the precise positioning and optical linking of nanoribbon / wire waveguides and other nanoribbon / wire elements to form optical networks and devices. In addition, such structures provide for waveguiding in liquids, enabling them to further be used in other applications such as optical probes and sensors.

A method for achieving flickerless operation of imagers using a rolling shutter, including the steps of detecting flicker in an image frame and adjusting an integration time such that the integration time is an integer multiple of a light intensity period, is described. The method reduces the task of detecting flicker to detecting a spatial sine wave in the image frame by subtracting two image frames from each other. The subtraction reduces or eliminates image content from the image frames and makes the detection process independent of image content. This method can be practiced based on a very short sequence of image frames (as few as two image frames) and is virtually insusceptible to motion of the image content. Adjustments to the integration time are made by changing the horizontal blanking time of the imager and, thereby extending the duration time of each row of said image frame.

The invention discloses a laser projection light source for achieving uniform no-speckle illumination, and the light source comprises a laser for generating laser light; a scattering sheet which enables a light beam to be scattered, enlarges a divergence angle of the light beam, enlarges the area of the light source, and reduces the coherence of a light field; an optical integration rod which enables the light beam to be reflected many times in the optical integration rod, improves the distribution uniformity of the light field, and reduces the coherence of the light field; a reflection bowl which is used for collecting the emergent light of the optical integration rod, reduces the divergence angle of the light beam, and enables light to be emitted outwards in parallel as much as possible; a double-row fly-eye lens array which collects the light of the reflection bowl, reduces the divergence angle of the light, and improves the distribution uniformity and parallelism of the light field; and a field lens which gathers light, reduces the divergence angle, and improves the uniformity.

The present invention relates to an optical integration system for disaster emergency broadcasting communication, including: sensor units which detect surrounding temperatures and strains and are separately located from each other; a broadcasting communication integration unit for transmitting an integrated broadcasting communication optical signal by multiplexing a received broadcasting signal and a received communication signal as optical signals having different wavelengths; reception units which receive the optical signal transmitted from the broadcasting communication integration unit, demultiplex the received optical signal according to each wavelength, transmit the separated broadcasting signal and the separated communication signal to a corresponding peripheral terminal, and transmit the information detected through the sensor units to the broadcasting communication integration unit; and a management server for determining a disaster state from the information which is detected through the sensor units and is received through the reception units and the broadcasting communication integration unit, and transmitting a processing signal through the broadcasting communication integration unit to the reception units according to the disaster state when determining the disaster state, wherein the management server transmits a signal to each guiding indication lamp connected to the separately arranged reception units on the basis of a location information database in which the location information of the sensor units is stored according to the recognized disaster state, and transmits an emergency guide broadcasting signal to the peripheral terminal, and each reception unit includes a mobile remote management server which further connects wireless sensor nodes so as to perform communication through the restoration of retrievable wired / wireless networks in the disaster state, and transmits the information through the wireless sensor nodes to the reception units by enabling communication with the management server and enabling remote connection with the wireless sensor nodes. The system of the present invention can induce reconstruction of destroyed power and information communication networks as emergency networks, and active evasion from a disaster area using independent emergency power in the disaster state.

The embodiment of the invention discloses a wavelength selection method, a wavelength selection device and a wavelength selection system, relates to the field of optical integration and solves the technical problem that the conventional equipment is greatly modified in the process of transmitting common public radio interface (CPRI) optical signals through an optical distribution network (ODN) inthe prior art. The method in the embodiment of the invention comprises the following steps of: configuring the receiving wavelength of an optical module as a first uplink wavelength according to a wavelength allocation list; acquiring uplink detection information for indicating whether an uplink optical signal reflected by a partial reflector is detected on the first uplink wavelength; if the acquired uplink detection information indicates that the reflected uplink optical signal is not detected, configuring the receiving wavelength of the optical module as a corresponding first downlink wavelength; acquiring downlink detection information; and if the acquired downlink detection information indicates that a downlink optical signal is detected, configuring the transmitting wavelength of the optical module as the first uplink wavelength. The embodiment of the invention is mainly applied to wavelength division multiplexing (WDM) scenes.

An apparatus for performing surface-enhanced Raman scattering (SERS) is disclosed wherein an inner surface of a container is coated with SERS active materials such as nanoparticles of noble metals. Such a container can provide a partially enclosed, optical diffuse cavity whose inner surfaces serve for dual purposes of enhancing Raman scattering of the contained analyte and optical integration, therefore improving the efficiency of optical excitation and signal collection. The container may be configured to isolate the SERS active material from the external environment. The container, which may be a cylindrical tube, may be referred to as a SERS tube. Methods of coating the inner wall of a container with pulsed laser ablation and with nanoparticle colloids, respectively, are disclosed.

The invention discloses an all-fiber electro-optical modulator based on graphene materials and a method of the all-fiber electro-optical modulator. The all-fiber electro-optical modulator based on the graphene materials comprises a single mode fiber, a silicon dioxide groove-type substrate, an Al2O3 transition thin layer and a graphene membrane, wherein the single mode fiber is arranged on the silicon dioxide groove-type substrate and fixed through sealed epoxy glue, a groove is formed in the single mode fiber, the Al2O3 transition thin layer is arranged in the groove, and the graphene membrane is arranged on the Al2O3 transition thin layer. Conductivity performance of graphene is changed through change of voltage applied on a metal electrode, therefore an imaginary part or a real part of an effective refractive index of a graphene composite layer structure is changed, and an electric absorption strength modulator or a phase modulator is achieved. The all-fiber electro-optical modulator based on the graphene materials and the method of the all-fiber electro-optical modulator can achieve design of the all-fiber electro-optical modulator, and have the advantages of being tiny in size, little in power consumption, low in insertion loss, high in modulating speed, beneficial for optical integration and the like. In addition, due to the fact that additional optoelectronic devices are not introduced, the all-fiber electro-optical modulator based on the graphene materials and the method of the all-fiber electro-optical modulator are suitable for being used in an all-fiber communication system and a dense wavelength division multiplexing (DWDM) system.

The invention relates to a method for realizing integration of a polarizing beam splitter and a slow light device by using a bend waveguide, belonging to the technical field of micro optical integration. In the invention, the polarizing beam splitter and a coupled-cavity waveguide slow light device are integrated on the same flat plate by using the bend waveguide with two turn angles of 60 degrees for the first time. In the invention, a flat-plate structure based on a two-dimensional photonic crystal is designed; and the structure of the device is designed in such a way that each module of an integrated device works at the same frequency, thus high efficient coupling between the polarizing beam splitter and the bend waveguide as well as the slow light device is realized. The basic structure of the flat-plate structure is a photonic crystal GaAlAs (Gallium-Aluminum-Arsenic) flat-plate structure based on an air-vent triangular lattice, which is much closer to a traditional widely-applied photonic crystal manufacturing technology based on SOI (Silicon-On-Insulator) and has the characteristic of very good realizability. In addition, the polarizing beam splitter and the coupled-cavity waveguide slow light device are connected with each other by using the bend waveguide in the design of the scheme so as to provide a new method for realizing the micro PIC (Programmable Interrupt Controller).

The invention discloses a phase modulation signal full-optical wavelength conversion device. The phase modulation signal full-optical wavelength conversion device comprises a tunable dispersion compensator, an erbium-doped optical fiber amplifier, a variable optical attenuator, a tunable laser, a polarization controller, an optical beam splitter, a first optical coupler, a high-nonlinearity optical fiber, an optical filter and a signal demodulating and monitoring device. An output port of the tunable laser with the narrow linewidth is connected with an input port of the polarization controller. An output port of the polarization controller is connected with an optical integration port of the optical beam splitter. One optical splitting port of the optical beam splitter and an output port of the variable optical attenuator are connected with two optical splitting ports of the first optical coupler respectively. The first optical coupler, the high-nonlinearity optical fiber and the optical filter are sequentially connected. An output port of the optical filter and the other optical splitting port of the optical beam splitter are connected with a signal input port of the signal demodulating and monitoring device and a local oscillator input port of the signal demodulating and monitoring device respectively. Through the utilization of the phase modulation signal full-optical wavelength conversion device, harmonic suppression can be achieved, and signal quality is improved.

A line scan CCD optical integration time self-adaptive control method, which contains 1, estimating line scan CCD corresponded optical integration time according to relative parameter of line scan CCD output signal, 2, controlling line scan CCD driving time sequence generator according to estimated optical integration time and generating the driving pulse sequence needed in CCD normal work, said driving pulse sequence containing integration pulse sequence, transferring pulse sequence and reset pulse sequence, 3, line scan CCD output adjusted optical integration time signal by driving of pulse sequence, preprocessing and calculating said signal to extract correlation parameter of line scan CCD output signal, 4, comparing the correlation parameter of extracted CCD line scan output signal with preset threshold value, when the value is exceeds the threshold value, adjusting again by step 1, 2, 3, until the parameter is in preset threshold value range, 5, automatically completing adjustment of optical integration time.

The invention discloses an echo wall mode resonator and a preparation method thereof. The resonator comprises a hollow-core optical fiber, a waveguide, a waveguide resonator, a first single-mode optical fiber and a second single-mode optical fiber. The waveguide and the waveguide resonator are located in the hollow-core optical fiber. One end face of the first single-mode optical fiber is connected with one end face of the hollow-core optical fiber through welding. One end face of the second single-mode optical fiber is connected with the other end face of the hollow-core optical fiber through welding. The waveguide comprises an input optical waveguide, an inner surface waveguide and an output optical waveguide. Two end faces of the input optical waveguide are connected with one end face of the first single-mode optical fiber and one end face of the inner surface waveguide respectively. Two end faces of the output optical waveguide are connected with one end face of the second single-mode optical fiber and the other end face of the inner surface waveguide respectively. The inner surface waveguide is provided with an evanescent field. The echo wall mode resonator prepared by the connection method has a stable and simple structure. The optical coupling between the inner surface waveguide and the waveguide resonator is realized through the evanescent field of the inner surface waveguide, which is conducive to optical integration.

A distributed optical fiber sensing device based on a Brillouin fiber laser comprises a narrow linewidth pump laser, an erbium-doped fiber amplifier, a pulse signal generator, a scrambler, an optical isolator and the like. A dual-output port of the Brillouin fiber laser is used for outputting two beams of light waves with a frequency difference of a Brillouin frequency shift, one beam of frequency tunable Brillouin laser is pulse modulated into pump light, and the other beam is used as continuous probe light. The tunable Brillouin laser output is achieved through a temperature controller of a Brillouin laser chamber. The frequency tunable pulse pump light and the continuous probe light are in Brillouin interaction with each other in a sensing fiber. The signal processing at the rear end of the sensing system is the same as that of a general Brillouin optical-time domain analysis system. By providing the pump light and the probe light through the Brillouin fiber laser, the invention can eliminate a tunable microwave source and a mating modulator that are required in the general Brillouin optical-time domain analysis system, so that the cost and complexity of the whole system are greatly reduced and the optical integration and package of the system are facilitated.

The invention provides a surface plasma wave demultiplexer based on destructive interference, which mainly solves the problem that the transmission efficiency of the existing surface plasma wave demultiplexer is lower. The surface plasma wave demultiplexer based on the destructive interference comprises metal layers arranged at two sides of a medium layer; a plurality of coupled output resonant cavities are formed in the metal layer at one side of the medium layer; each coupled output resonant cavity is correspondingly provided with an outgoing channel; each outgoing channel is arranged at one side of the metal layer away from the medium layer and is symmetrical to the center of the coupled output resonant cavity. The structure of the surface plasma wave demultiplexer provided by the invention has stronger effects of light bondage, can break through the limitation of diffraction limit, and can transmit light in a nanometer scale; the surface plasma wave demultiplexer can be effectively connected with electronic apparatuses and conventional photon devices in a matching way, so that the reflection problem of the optical signal is effectively solved, and the surface plasma wave demultiplexer has wide application prospects in optical communication, optical integration, optical information processing and the like.

The invention discloses a silicon optical integration-based photon analog-to-digital conversion chip, which comprises a time-division multiplexing unit, a wavelength-division multiplexing unit, a mode-division multiplexing unit, a multi-mode modulator, a mode demultiplexing unit, a wavelength demultiplexing unit and a photoelectric detection unit, wherein various components are monolithically integrated on the same silicon chip. The repetition frequency of an input light pulse of a light wave is further improved through different polarization modes and different waveguide modes, thereby more easily achieving optical analog-to-digital conversion with a high sampling rate.

The invention relates to a photo bomb transmission method without time-space widening using photon crystal, which comprises following steps: determining aperture size, the aperture is needed which can superpose self-collimation area of equifrequency graph and zero group velocity dispersion area of group velocity dispersion graph according to photon crystal dispersion relation equifrequency graph and group velocity dispersion graph; perforation, adopting monocrystalline silicon material, perforating the monocrystalline silicon using electron beam exposure and ICP etching technology, to form periodically arranged air round aperture array of square crystal lattice or triangular crystal lattice, the aperture being above-mentioned size. The invention provides a convenient, energy-saving and brand-new means for accomplishing photon bomb transmission, also provides a basic medium material for optical signal transmission and processing, which will be widely used in field of optical integration, optical transmission and optical chip and signal processing.

The invention discloses a device and method for testing the peak value optical power of a continuous narrow pulse width laser. The device comprises a controllable attenuator, a photoelectric conversion sampling circuit and a central processor. The controllable attenuator is connected with an optical fiber input interface of a pulse optical source under test. The controllable attenuator is connected with the photoelectric conversion sampling circuit. The photoelectric conversion sampling circuit is connected with the central processor through a field programmable gate array (FPGA). The central processor is connected with a display module. Through the acquisition circuit designed by high-speed optical pulse conversion technology, high-speed pulse signal frequency and pulse width measuring technology, continuous pulse optical integration maintenance technology and range automatic shifting technology, the design of the device for testing the pulse optical power is achieved, the stand-alone device and method can be used for completing the test of the continuous pulse optical power, the problem of difficulty in instrumentation due to too many related links is overcome, the cost input and the system size are thus reduced, the operating procedure is simplified, and the device and method are highly versatile.

The invention provides a surface plasma filter based on a connection bridge of a rectangular ring resonant cavity and an incident waveguide. The means that the resonant frequency of an existing surface plasma filter is adjusted by changing structure parameters is mainly simplified, and thus the purpose for simplifying the manufacturing technology of the filter can be achieved. The surface plasma filter based on the connection bridge of the rectangular ring resonant cavity and the incident waveguide comprises metal layers arranged on the two sides of a dielectric layer, the single rectangular ring resonant cavity is arranged in the metal layer mounted on one side of the dielectric layer, the waveguide bridge is connected between the resonant cavity and the incident waveguide, and the waveguide bridge is arranged on the symmetry axis of the resonant cavity. The structure has an extremely high light constraint effect, the diffraction limit restriction can be broken through, and light can be transmitted on the nanoscale. The surface plasma filter is effectively connected with an electronic device and a traditional photonic device in a matched mode, the waveguide bridge length only needs to be changed, and thus light waves of different wave lengths can be effectively filtered out. The manufacturing technology of the filter is simple, and high application value can be achieved on the aspects of optical communication, optical integration, optical information processing and the like.

Provided is a slab lens for realizing plane wave focusing by adopting metastructure surface. The slab lens for realizing plane wave perfect focusing by adopting the metastructure surface is characterized by carrying out periodic arrangement in the radial direction of the circle of the plane on eight V-shaped focusing structures, wherein each V-shaped focusing structure is arranged uniformly on the circular ring, the phases of the eight V-shaped focusing structures periodically arranged in the radial direction of the circle from the inside out are 0, pi / 4, pi / 2, 3pi / 4, pi, 5pi / 4, 3pi / 2 and 7pi / 4 respectively, and the linear interval is pi / 4; calculating the arrangement mode of the V-shaped structures in the radial direction according to phase distribution of perfect focusing; then, obtaining the number n=L / a of the structures needing etching on the circular ring through determining the corresponding position r of each focusing structure; and designing different microstructure groups and obtaining different focal-length slab lenses. According to the slab lens, holes need to be etched only in a 50 nm silver film, so that the thickness of the slab lens is very thin, and the slab lens is hopeful to be applied to the optical integration field.

The invention belongs to a device of photoconduction and other optical elements, in particular to a tapered optical fiber ring cavity optical comb wavelength division multiplexer provided with a multiple wavelength selection and division multiplexing functional device, and a manufacturing method thereof. The invention is a tapered optical fiber ring cavity optical comb wavelength division multiplexer which is structurally characterized in that the wavelength division multiplexer comprises optical fibers and a ring cavity, and the external diameter of the horizontal middle section of the ring cavity is greater than the diameter of each optical fiber. Each optical fiber is drawn into a cone type with a thin middle part to form a tapered optical fiber, the optical fibers and the ring cavity are in the spaced arrangement, and tapered waists of every two adjacent optical fibers are tangent to the ex-circle of the horizontal middle section of the ring cavity. The wavelength division multiplexer has the advantages of convenient and simple input and output optical processing, compact structure, higher coupling efficiency, small channel loss, realizable optical integration and industrial production, and good practicality. Tests tell that the coupling efficiency between resonant wavelength tapered optical fibers and beams in the ring cavity can reach 90 percent.

An apparatus for performing surface-enhanced Raman scattering (SERS) is disclosed, wherein an inner surface of a container is coated with SERS active materials such as nanoparticles of noble metals. The container can provide a partially enclosed, optical diffuse cavity. Inner surfaces of the optical diffuse cavity serve for dual purposes of enhancing Raman scattering of the contained analyte and optical integration, thereby improving the efficiency of optical excitation and signal collection. The container may be configured to isolate the SERS active material from the external environment. The container, which may be a cylindrical tube, may be referred to as a SERS tube. Methods of coating the inner wall of a container with pulsed laser ablation and with nanoparticle colloids, respectively, are disclosed.

The invention relates to an optical filter device, and in particular relates to a surface Plasmon optical waveguide filter. The surface Plasmon optical waveguide filter comprises a metal waveguide, wherein a passage through which incident light and reflected light can pass and a resonant cavity for generating resonant wavelength are arranged in the metal waveguide, a dielectric medium is filled in the passage and the resonant cavity, and a metal gap which is used for obstructing the in and out of the optical wave is arranged between the passage and the resonant cavity. A sub-wavelength filter is constructed on the metal waveguide. The filter is simple in structure, small in size (only hundreds of nanometers) and easy for high-density optical integration; the research of an optical switch for optical communication is favored through the narrow-band filter with high performance. Moreover, the wavelength of the filter can be adjusted through the geometric size of the resonant cavity or the dielectric medium with different reflective indexes in the resonant cavity, i.e. the filter of any wavelength can be realized by manufacturing different devices in different sizes or filling different dielectric media with different reflective indexes on the device, and the application range of the device can be greatly enlarged.

The invention provides an optical integration device and a circulator. The optical integration device comprises the circulator, an input and output optical port located at one side of the circulator,and an optical input port and an optical output port which are located at the other side of the circulator. The circulator comprises a first polarization splitting prism, a second polarization splitting prism and a third polarization splitting prism, a first Faraday rotating piece is arranged between the first polarization splitting prism and the second polarization splitting prism, and a second Faraday rotating sheet is arranged between the second polarization splitting prism and the third polarization splitting prism. According to the present invention, the reverse light entering from the input and output light port is outputted to the light input port after being isolated twice by the first Faraday rotation sheet and the second Faraday rotation sheet, so that the influence on a laser signal source can be effectively reduced. The reverse light entering from the light output port only passes through the second Faraday rotation sheet, is isolated once, and is outputted to the input / output light port, so that the isolation requirement can be met, and the cost can be reduced.

The invention discloses a temperature gradient-based method for preparing a three-dimensional colloidal crystal. By utilizing the characteristic that the effective diameters of temperature-sensitive PNIPAM colloidal particles change along with the change of temperature, the PNIPAM-based colloidal crystal growth behavior can be realized by adopting a controlled temperature field. The colloidal crystal growth process can be stably and rapidly controlled by virtue of a precise orientation displacement platform under the condition that a constant temperature field is controlled, so that a single crystal of the colloidal crystal is prepared. According to the method disclosed by the invention, the three-dimensional colloidal crystal can be rapidly obtained, and the possibility is provided for large-scale application of the colloidal crystal. Meanwhile, the single crystal of the prepared colloidal crystal serves as a template, the other types of photonic crystals can be further obtained, the problem that the three-dimensional colloidal crystal cannot be rapidly prepared is solved, and the method has the extremely high application value in the fields of light control and optical integration.

The present invention relates to an optical integration system for disaster emergency broadcasting communication, including: sensor units which detect surrounding temperatures and strains and are separately located from each other; a broadcasting communication integration unit for transmitting an integrated broadcasting communication optical signal by multiplexing a received broadcasting signal and a received communication signal as optical signals having different wavelengths; reception units which receive the optical signal transmitted from the broadcasting communication integration unit, demultiplex the received optical signal according to each wavelength, transmit the separated broadcasting signal and the separated communication signal to a corresponding peripheral terminal, and transmit the information detected through the sensor units to the broadcasting communication integration unit; and a management server for determining a disaster state from the information which is detected through the sensor units and is received through the reception units and the broadcasting communication integration unit, and transmitting a processing signal through the broadcasting communication integration unit to the reception units according to the disaster state when determining the disaster state, wherein the management server transmits a signal to each guiding indication lamp connected to the separately arranged reception units on the basis of a location information database in which the location information of the sensor units is stored according to the recognized disaster state, and transmits an emergency guide broadcasting signal to the peripheral terminal, and each reception unit includes a mobile remote management server which further connects wireless sensor nodes so as to perform communication through the restoration of retrievable wired / wireless networks in the disaster state, and transmits the information through the wireless sensor nodes to the reception units by enabling communication with the management server and enabling remote connection with the wireless sensor nodes. The system of the present invention can induce reconstruction of destroyed power and information communication networks as emergency networks, and active evasion from a disaster area using independent emergency power in the disaster state.

Hybrid optical integration places very strict manufacturing tolerances and performance requirements upon the multiple elements to exploit passive alignment techniques as well as having additional processing requirements. Alternatively, active alignment and soldering / fixing where feasible is also complex and time consuming with 3, 4, or 6-axis control of each element. However, microelectromechanical (MEMS) systems can sense, control, and activate mechanical processes on the micro scale. Beneficially, therefore the inventors combine silicon MEMS based micro-actuators with silicon CMOS control and drive circuits in order to provide alignment of elements within a silicon optical circuit either with respect to each other or with other optical elements hybridly integrated such as compound semiconductor elements. Such inventive MEMS based circuits may be either maintained as active during deployment or powered off once the alignment has been “locked” through an attachment / retention / latching process.

The invention discloses a transverse electric-pass polarizer based on composite waveguides. The polarizer comprises an incident silicon waveguide, an emitted silicon waveguide, and a middle coupling portion between the incident silicon waveguide and the emitted silicon waveguide. The middle coupling portion is of a five-layer waveguide structure arranged on an SOI substrate, the five-layer waveguide structure sequentially including, from bottom to top, a lower silicon layer, a lower silicon dioxide layer, an upper silicon layer, an upper silicon dioxide layer and a metal chromium layer. When a TM mold transmitted from the incident silicon waveguide passes by the middle coupling portion, the TM mold is coupled from the lower silicon dioxide layer to the upper silicon dioxide layer and is absorbed for attenuation by the metal chromium layer. When a TE mold transmitted from the incident silicon waveguide passes by the middle coupling portion, the TE mold is transmitted along the lower silicon dioxide layer and will not be coupled to the upper silicon dioxide layer. The polarizer has the advantages of small size, high extinction ratio and low insert loss, enables coupling loss to be reduced, and facilitates optical integration.

The light amplifier includes InP substrate, n type InP buffer layer, active region in tensile strain structure of quanta trap, O type InP cladding layer, P type InGaAs contact layer, and electrodes in top and bottom layers. Characters are that AlGalnAs is adopted in active region so as to prevent electrons to pass through barrier layer causing leak, and improve high temperature characteristics. The invention is low sensitive to polarization, and provides good temp characteristic, applicable to optical network, optical integration and photoelectron integration.

The invention discloses a surface plasma resonance sensor based on plane dielectric grating coupling, which includes a plane dielectric grating, a nanometer thickness metallic membrane and a glass substrate, wherein the upper surface of the plane dielectric grating is contacted with an environmental medium; the change of the refraction ratio of the to-be-detected object in the environment leads to the change of the incident wave vector and further the change of the diffraction spectrum of the plane sine grating; the lower surface of the plane dielectric grating is connected with the nanometer thickness metallic membrane; the additional wave vector led in by the plane dielectric grating can be used for exciting the surface plasma resonance effect at the interface; the plane dielectric grating consists of photorefractive materials, and the dielectric constants thereof are in sine distribution in space; and the grating vector K of the plane dielectric grating can be inclined. The sensor is simple to prepare, can be developed in the aspects of low cost, integration and array as each layer adopts the plane structure and is easy to perform optical integration, has the advantages of stable work and high sensitivity, and provides an efficient research means in fields such as mine safety and air pollution.

The invention discloses a magneto-optic crystal / magneto-optic film composite Faraday rotator, provided with a rare-earth iron garnet magneto-optic crystal and arranging a liquid-phase epitaxial iron garnet magneto-optic film layer on the rare-earth iron garnet magneto-optic crystal. The rare-earth iron garnet magneto-optic crystal has a composition: Re1xRe2yBi3-x-yFe5O12, where 1.5<x<2.8, 0.2<y<1.0, and Re1 stands for Yb, and Re2 stands for Tb, Ho and Y and they has positive and negative response to the wavelength coefficient of Faraday rotator, respectively. The composition of the said film layer is TbxBi3-xGaFe5-yO12, where 1.5<x<2.5, and 0<y<1.0. The invention has wide operating range and operating temperature internal and can make it possible for an wide-range (>50nm), wide-temperature range (-30 deg.C to +80 deg.C) optical isolator, which has an extremely great application value in the development of optical communication system, optical integration system, optical measurement system, and other systems.

The invention discloses a random laser based on a wave-guiding structure. The random laser based on the wave-guiding structure comprises a pumping light source, and further comprises the wave-guiding structure formed by ZnO random particles and organic polymers. A magnesium oxide (MgO) coating layer is plated on the periphery of the wave-guiding structure. The pumping light source stimulates a ZnO waveguide from one side, and waveguide one-side incidence is adopted as a pumping mode. The random laser based on the wave-guiding structure ensures that the random laser can achieve directionality exit, and is not limited to the fact that an emitter of a random laser in the prior art is limited to a round disc, a nanorod and the like. Meanwhile, the random laser based on the wave-guiding structure can further reduce scattering loss and emission threshold values of light in the waveguide, random laser light of the wave-guiding structure can provide a micro-nano optical integration system with quite ideal light sources, and compared with the prior art, the random laser based on the wave-guiding structure is easy to achieve.