79 results about "Resonance wavelength" patented technology

The invention provides a transcendental extreme ultraviolet light source device which comprises a free electron laser main body which comprises an undulator system and an optical resonant cavity. The undulator system comprises a modulation section undulator and a radiation section undulator; the optical resonant cavity comprises resonant cavity reflectors and a dispersion section, and the modulation section undulator, the dispersion section undulator and the radiation section undulator are sequentially arranged in the direction of an electron beam and are all located between the resonant cavity reflectors; the resonant wavelength output by the radiation section undulator is 1 / h of the resonant wavelength of the modulation section undulator, h is the harmonic number, and when the resonant wavelength output by the radiation section undulator is 6-7nm, the radiation wavelength reflected by the resonant cavity is h times of the resonant wavelength output by the radiation section undulator, so that the resonant cavity is prevented from adopting a reflector with the reflection wavelength of 6-7nm. According to the device, the radiation of the target wavelength is output by using harmonic waves, and a reflector with relatively long wavelength and mature technology can be directly used; various accelerators are compatible, the energy efficiency of the accelerators is greatly improved, and power consumption is reduced.

A display device comprises a plurality of pixels, each with a filter element. The display device also includes a laser light source for emitting source light with an adjustable wavelength. The source light can be sequentially directed into the filter elements of the pixels. Each filter element has an emission spectrum that exhibits an intensity maximum at a resonance wavelength that depends on a specific emission angle.

A method of wavelength tuning in a silicon photonics circuit includes receiving a bus waveguide, a ring resonator optically coupled to the bus waveguide, and a dielectric layer over the bus waveguide and over the ring resonator. The method further includes performing a first heat process at a first temperature to heat up the dielectric layer, where the first heat process shifts an initial resonance wavelength of the ring resonator to a first resonance wavelength shorter than the initial resonance wavelength. The first heat process permanently shifts the initial resonance wavelength to the first resonance wavelength, the first resonance wavelength being a wavelength when no heat is being applied to the ring resonator.

The invention provides a spectrum enhancement filtering metasurface method based on multi-physics field coupling, and the method comprises the steps: building a heat-force multi-physics field model of a metasurface under the incidence of high-power laser, obtaining a temperature field through calculation, and recognizing a hot spot region based on the temperature field; calculating a thermal stress field based on the temperature field, calculating refractive index variation and distribution of the metasurface material based on the temperature field and the thermal stress field, further quantifying resonant wavelength drift caused by the refractive index variation, and positioning an optical mode mismatch area; reversely designing geometric parameters of a compensation structure based on the resonant wavelength drift distance and the optical mode mismatching region; preparing a compensation type metasurface sample according to the geometric parameters, and testing the spectral response of the compensation type metasurface sample under high-power laser; based on the spectral response, the spectral enhancement filtering stability of the compensation type metasurface sample is evaluated, the problem of thermal-optical mismatch caused by high-power laser is solved, and long-term stable operation of the spectral filtering function in a severe environment is achieved.

The invention discloses a spectrum polarization detection method based on a quasi-continuous domain bound state metasurface, and belongs to the application field of micro-nano optics and spectrum polarization detection. The implementation method comprises the following steps: adopting a symmetrical broken elliptical amorphous silicon nano-column arrangement mode to obtain a metasurface structure unit with a narrow-band formant, a high-quality factor and linear polarization dependence; the method comprises the following steps: analyzing a change rule of resonance wavelength along with geometric parameters of a structural unit and a change rule of resonance intensity along with a polarization state of incident light through numerical simulation to obtain a series of metasurface structures with different resonance wavelengths and different polarization responses, reasonably arranging the metasurface structures, processing a metasurface sample, and testing a reflection spectrum of the metasurface sample, and the spectrum and polarization response characteristics are calibrated. A spectrum polarization detection system composed of a detection target, a metasurface and a CMOS detector is built, and the spectrum and polarization information of the target is detected based on the spatial position arrangement of the metasurface structure and the Stokes relation by using gray information shot by the CMOS detector.

A chemiluminescent nanoconstruct is described herein. The chemiluminescent nanoconstruct structure may comprise a plasmon nanostructure having at least one localized surface plasmon resonance wavelength ([lambda] LSPR), at least one spacer coating, at least one chemiluminescent agent having a maximum emission wavelength ([lambda] EM), and at least one biorecognition element. The signal of the chemiluminescent nanoconstruct structure is greater than the signal of only the at least one chemiluminescent agent.

This invention discloses a bimetallic hybrid metasurface that achieves polarization-selective absorption and tunable liquid immersion. The metasurface consists of a three-layer structure: a bimetallic hybrid layer, a silicon dioxide layer, and a silver reflective layer. The bimetallic hybrid layer is composed of aluminum and titanium nanoribbons. The bimetallic hybrid metasurface achieves perfect absorption of incident light under x-polarized light at the resonant wavelength and specular reflection of incident light under y-polarized light, thus exhibiting a high extinction ratio. Furthermore, the absorption peak wavelength of the metasurface can be continuously and dynamically tuned by adjusting the unit period of the metasurface or by utilizing active tuning through liquid immersion. The bimetallic hybrid metasurface proposed in this invention achieves high-contrast polarization-selective absorption and possesses advantages such as simple structure, ease of integration, and dynamic tunability, thus it can be widely applied in practical applications such as novel optical polarizers and photodetectors.

The invention discloses a visible light metasurface based on surface lattice resonance and a design method thereof. The design method comprises the following steps: constructing a dimensionless parameter space of a metasurface structure; performing simulation scanning in the dimensionless parameter space to determine main parameters strongly related to the resonant wavelength and secondary parameters weakly related to the resonant wavelength; setting the secondary parameter as a fixed value, taking the main parameter as a single design variable, determining the value of the main parameter according to the target resonant wavelength, and designing the serialized metasurface with the resonant wavelength continuously adjustable in the visible light range. According to the method, the design process can be obviously simplified, the process robustness can be greatly improved, the harsh dependence on the processing precision of the nano unit is reduced, the compatibility with the mainstream micro-nano processing process is ensured, and the stability and reliability of the device performance are ensured.

The invention discloses a method for measuring a residual birefringence difference value of a transparent ferroelectric electro-optical material based on a Fabry-Perot resonant cavity. The method comprises the following steps: constructing a Fabry-Perot resonant cavity measuring light path consisting of a broadband light source, a polarization control assembly and a sample to be measured; the polarization state of incident light is accurately controlled through a magnetic control Faraday rotating mirror, and transmission spectrums in the o-light direction and the e-light direction are obtained respectively; a high-precision spectrum acquisition module is adopted to record transmission spectrum characteristics; based on an original spectrum processing algorithm, the residual birefringence difference value of the to-be-detected material is calculated by analyzing the resonant wavelength offset and the free spectrum range change of the o-light and e-light transmission spectrums. The method solves the problem that the weak birefringence detection capability of the existing measurement technology is insufficient, has the advantages of high measurement precision, strong anti-interference capability and the like, and is suitable for performance evaluation, process optimization and device performance improvement of the transparent ferroelectric electro-optical material.

The invention belongs to the technical field of optical thin films, display imaging and holographic storage, and particularly discloses a chalcogenide phase-change material-based dynamic programmable narrow-band optical filter, a first Bragg reflector, a middle spacing layer and a second Bragg reflector form a Fabry-Perot resonant cavity, the resonant wavelength of the Fabry-Perot resonant cavity is determined by the optical thickness of each thin film, and the thickness of the Fabry-Perot resonant cavity is smaller than that of each thin film. The optical filter is used for outputting different transmission spectrums by changing the central wavelength of filtered light; the chalcogenide phase change material layer is used for realizing on-off and gray scale adjustment of a transmitted spectrum through a phase change process from an amorphous state to a crystalline state; and the top anti-reflection layer is a third transparent dielectric layer, and is used for anti-reflection of the transmitted spectrum and preventing oxidation of the chalcogenide phase change material. According to the invention, excellent narrowband filtering characteristics and high color saturation are realized, and high switch contrast is realized by using significant difference of extinction coefficients before and after phase change of the phase change material.

The application relates to a surface enhanced Raman scattering (SERS) substrate, a preparation method and application thereof, and belongs to the technical field of Raman spectrum detection. The substrate comprises, from bottom to top, a substrate layer, a distributed Bragg reflector, a chalcogen phase change material functional layer and a nanoscale metal structure layer. The distributed Bragg reflector is composed of a periodic structure stack of medium materials with different refractive indexes. The distributed Bragg reflector is coupled with the nanoscale metal structure layer to excite a Tamm state. The chalcogen phase change material functional layer can realize reversible regulation of amorphous state and crystalline state under external light excitation, changes the Tamm state resonance wavelength to regulate the SERS enhancement effect. The application realizes high-sensitivity detection through double enhancement of the Tamm state and localized surface plasmon resonance, has the characteristics of non-volatility, reconfigurability, high reproducibility and design flexibility, is convenient to operate, stable in performance, and is suitable for fields of chemical biological sensing, laboratory chip systems and optical encryption.

The invention discloses an MIM waveguide sensor based on Fano resonance and an application method of the MIM waveguide sensor, and relates to the technical field of optical devices. A metal coating is plated on the substrate; a U-shaped resonant cavity is etched on the metal coating, and a metal-medium-metal MIM straight waveguide is etched below the U-shaped resonant cavity; wide-spectrum light enters from the left side of a straight waveguide and exits from the right side of the straight waveguide, and when resonance is excited, light beam energy corresponding to the resonance wavelength is coupled into a U-shaped resonant cavity, so that the transmissivity of the wavelength is reduced, and a transmission peak is formed; the sensor has a wide and stable low refractive index detection range.

A Vertical Cavity Surface-Emitting Laser (VCSEL) has a body comprising a vertical stack of semiconductor layers one on top of the other, including: a current confinement region including an area of low resistance to current flow defined by an area of high resistance to current flow, and a first epitaxial sublayer disposed proximate to the current confinement region, the first epitaxial sublayer including a protrusion or a recess defines a main cavity, and the balance of the first epitaxial sublayer defines an outer cavity; wherein the protrusion or recess is defined by a physical step h that is predetermined according to the equation: qλ0−mλ1=n0h where λ0 is resonant wavelength of light in the main cavity, λ1 is resonant wavelength of light in the outer cavity, q is a half-integer positive number, n0 is effective refractive index in the main cavity, and m is a constant.

The invention discloses a strong dispersion dielectric grating guided mode resonance optical filter insensitive to angles. The filter is based on a strong-dispersion sub-wavelength dielectric grating structure, and the resonant wavelength shows the characteristic of being insensitive to the change of an incident angle. By reducing the thickness of the grating layer and the grating line width, the angle sensitivity of the device can be further reduced. The insensitivity of the wavelength of the device to the angle mainly depends on the intrinsic dispersion characteristic of an excited optical mode in the device, that is, the frequency of the optical mode with strong dispersion changes slowly along with in-plane wave vectors, so that the change of the far-field frequency response along with the angle is obviously slowed down. Based on the principle, an angle-insensitive metasurface device can be designed by using a strong dispersion optical mode. The design method provided by the invention is not only suitable for an optical filter, but also can be popularized to other metasurface devices with strict requirements on angle sensitivity, and has wide application prospects in the fields of optical communication, hyperspectral and multispectral imaging, sensing and the like.

The application provides a visible light band optical fiber SPR liquid refractive index linear measurement device and method, the device comprises a broadband light source, a first lens and a second lens, a polarizer, a third lens and a fourth lens, a pinhole, a fifth lens, an optical fiber SPR, a sixth lens, a diffraction grating, a concave mirror, a linear array CCD and a data processing unit; the data processing unit is used for extracting the resonance wavelength corresponding to the normalized light intensity minimum value from the wavelength-intensity spectrum curve, and calculating the refractive index of the liquid medium to be measured according to the linear relationship between the refractive index and the resonance wavelength which is calibrated in advance. The device is not only intuitive in optical path debugging and easy to operate, but also has a rigorous theoretical model and high measurement precision, and is very suitable for rapid and accurate refractive index screening and analysis of a large number of low-concentration liquid samples, and has wide application prospect and industrial value.

A microdrone is adapted to, selectively under illumination, trap and transport a particle. The microdrone comprises a plurality of motion-promoting antenna structures and a trapping-field-promoting antenna structure. The plurality of motion-promoting antenna structures comprises a first motion-promoting antenna structure and a second motion-promoting antenna structure. Each of the first and the second motion-promoting antenna structures exhibits a respective optically addressable resonance at a respective first resonance wavelength. Each of the first and the second motion-promoting antenna structures is adapted to scatter incoming, circularly polarized light at the respective first resonance wavelength such that at least a fraction of a momentum of the incoming, circularly polarized light is transferred to the microdrone. The trapping-field-promoting antenna structure exhibits an optically addressable resonance at a second resonance wavelength. The trapping-field-promoting antenna structure is adapted to provide, under illumination with incoming light at the second wavelength, a gradient force directed at the trapping-field promoting antenna structure both for left-handed circularly polarized incoming light at the second wavelength and for right-handed circularly polarized incoming light at the second wavelength.

The application discloses a kind of optical fiber LMR sensing probe systems based on double film layer structure, by supercontinuum spectrum light source, Y type optical fiber bundle, double film layer optical fiber LMR sensing probe, optical fiber spectrometer and host computer software composition;The double film layer optical fiber LMR sensing probe is sequentially removed by inside to outside cladding large core diameter multimode optical fiber, low refractive index matching layer, loss mode excitation layer, solve the LMR spectrum signal cross talk problem by TE / TM polarized light excitation, on spectrum, as TE / TM polarized light excitation LMR resonance wavelength does not affect each other, thus produce double resonance effect.The double film layer optical fiber LMR sensing probe system proposed in the application not only realizes the substantial improvement of detection precision, and double resonance sensing result can be verified each other, further guarantee the reliability of experimental result.

The invention is a device and a method for detecting an acoustic wave propagating towards a membrane, the membrane carrying a waveguide comprising an optical cavity, the optical cavity defining a resonance frequency. The resonance frequency of the optical cavity is changed under the effect of the membrane vibration. The device comprises a light source for directing a light wave into the optical cavity, and a servo circuit for servo-controlling the wavelength of the light wave to the resonance wavelength of the optical cavity. Monitoring the change in wavelength of the light wave allows to estimate the amplitude of the acoustic wave.

The utility model relates to a vortex light phase singular point decomposition device, which comprises a laser module, the laser module emits laser with resonance wavelength with an alkali metal atom D1 line, and the laser sequentially passes through an isolator, a lens A, a lens B, a reflecting mirror and a polaroid A and enters an alkali metal atom medium after being reflected by a polarization splitting prism A; the laser is emitted from the alkali metal atom medium and then is reflected by a polarization splitting prism B to enter a light collector B; incident vortex light is processed by the window sheet A, the diaphragm A, the diaphragm B, the ground glass sheet, the polaroid B and the lens C, then transmitted and enters the alkali metal atom medium through the polarization splitting prism A. The incident vortex light is emitted from the alkali metal atom medium, then transmitted and passes through the polarization splitting prism B, and is processed by the lens D and the window sheet B, and then emergent vortex light subjected to phase singular point decomposition is output. According to the method, the decomposition of the phase singular point with the larger topological charge to the phase singular point with the topological charge of + / -1 is realized, and the method has potential application value in the quantum communication technology based on the atomic medium.

The experimental Q value was increased by approximately 100 times from the typical value, resulting in 1.0 × 10⁻⁶ 5 To provide a nanostructure array that achieves a Q value exceeding [a certain threshold]. [Solution] The system comprises an inorganic solid insulating layer 12 and a metasurface layer 14 made of a high refractive index dielectric material that confines light, which is laminated on the inorganic solid insulating layer 12. The metasurface layer 14 is configured as an array having pair rods or nanopillars as single units, which have a shallow-cut structure in which the etching depth h of the light confinement regions (16a, 16b) is in the range of 25 nm to 200 nm. The system has a thin film high refractive index dielectric layer located in the region opposite to the inorganic solid insulating layer and the bottom of the shallow-cut structure that forms the side wall of the waveguide. The light confinement region has a resonance wavelength of 1.0 × 10 in the quasi-bound state in a continuum. 3 Exceeding 1.0 × 10 6 It has the following Q-values.

The invention discloses a weak-coupling few-mode photonic crystal fiber transformer substation temperature monitoring method, system, device and medium, and the method comprises the steps: constructing a fiber theoretical model, and evaluating the performance indexes of the fiber theoretical model to obtain a production fiber model; generating a laser beam; decomposing the laser beam into a signal beam and a reference beam through an optical coupler, carrying out polarization processing on the signal beam to obtain linear polarized light, and collecting the intensity of the reference beam; coupling the linear polarized light to a production optical fiber model, and collecting the spectrum of the linear polarized light output by the production optical fiber model; and calibrating the spectrum of the linear polarized light based on the intensity of the reference light beam, extracting a resonant wavelength offset from the calibrated spectrum, and determining the real temperature of the to-be-measured equipment according to the resonant wavelength offset. According to the method, the performance of the sensing module is improved by constructing an optical fiber theoretical model and optimizing iteration, and meanwhile, the problem of signal attenuation is solved through double-beam design and a calibration mechanism.

A method for measuring thickness distribution and refractive index dispersion curve of a liquid film, comprising: covering the liquid film on a SPR sensing module; irradiating a wide-spectrum linearly polarized parallel light beam on the SPR sensing module to obtain reflected light through total reflection, the wide-spectrum linearly polarized parallel light beam exciting SPR mode and / or PWR mode on the SPR sensing module through total reflection; receiving the reflected light carrying information of the liquid film by a hyperspectral imager to obtain a hyperspectral image, pixels in the hyperspectral image corresponding to positions on the liquid film one by one; determining at least three measured resonance wavelengths at a target position corresponding to a target pixel according to the hyperspectral image; obtaining the liquid film thickness at the target position and the refractive index dispersion curve of the liquid film according to the at least three measured resonance wavelengths at the target position; obtaining the liquid film thickness at other positions according to the refractive index dispersion curve of the liquid film at the target position and the measured resonance wavelengths at the other positions; and obtaining the thickness distribution of the liquid film according to the thickness of the liquid film at all positions.

The application discloses a kind of lithium niobate microcavity modulator electro-optic tuning efficiency calibration method and system, to solve the problem of serious direct current drift interference, poor reliability of measurement results, low repeatability in prior art.It includes:1) scanning the wavelength of the microcavity to be measured, collecting static transmission spectrum and fitting, extracting resonance wavelength, optical full width at half maximum and quality factor;2) adjust the narrow linewidth laser to the resonance wavelength, build the optical power feedback closed loop, suppress the resonance point drift caused by environmental disturbance;3) generate high-frequency periodic linear scan voltage and load to the modulation electrode, make the transmission power change periodically with the transmission peak of tuning;4) collect time-domain transmission voltage signal and store synchronously with scan voltage signal;5) combine transmission voltage waveform, optical full width at half maximum and scan voltage electrical characteristics, obtain electro-optic tuning efficiency.The application can effectively suppress interference, improve calibration accuracy and repeatability, suitable for lithium niobate microcavity modulator performance test.

The application discloses a method for suppressing stimulated Brillouin scattering effect by using a cascaded long-period fiber grating. The transmission spectrum of the cascaded long-period fiber grating has a series of comb-shaped resonance peaks, two adjacent resonance peaks are regarded as a passband and two stopbands, the passband bandwidth and resonance wavelength are changed by adjusting the parameters of the cascaded long-period fiber grating, the passband and stopband formed by the adjacent resonance peaks of the transmission spectrum correspond to signal light and Stokes light generated by the stimulated Brillouin scattering effect respectively, so that the non-working side lobe laser is coupled from the core mode to the cladding mode while the signal light passes through. The performance stability of the cascaded long-period fiber grating is improved by using a water ring flow-based desensitization packaging technology, so that the output power level and beam quality of the fiber laser are improved, and the possibility of laser damage is reduced. The application has the characteristics of low cost, high flexibility and strong applicability.

The invention discloses a chiral metasurface construction method based on rotation transformation, a metasurface device comprises a substrate and a chiral metasurface located on the substrate, and the chiral metasurface is a rectangular nanorod array arranged periodically. The metasurface unit is composed of rotating rectangular silicon nanorods, and selective regulation and control of spin angular momentum of incident light are achieved by introducing in-plane mirror symmetry of a geometric rotation destroying structure. Simulation results show that the metasurface shows remarkable circular dichroism at the resonant wavelength of 633 nm, the transmissivity of the metasurface to left-hand circularly polarized light reaches up to 73%, and meanwhile the transmissivity of right-hand circularly polarized light is restrained to 2%. The device has the advantages of compact structure, easiness in integration and the like, and is expected to provide an effective solution for chiral biosensing application.

The invention discloses a preparation method of a material with a plasmon array and the material. The method comprises the steps that based on a preset nickel female template, imprinting is carried out on a pretreated first original metal sheet; performing anodic oxidation on the first surface of the first original metal sheet to prepare an initial mask plate with an anodic oxidation layer; performing reprocessing on the initial mask plate so as to remove redundant materials on the first original metal sheet under the condition of protecting the anodic oxide layer, thereby obtaining the mask plate; and on the basis of a mask plate, imprinting is performed on the preprocessed second original metal sheet, and the material with the plasmon array is prepared. The material with the array period distance equivalent to the resonance wavelength and coupled with the Bloch wave can be prepared in a secondary imprinting mode, it can be guaranteed that the uniformity and stability of the photon local area are improved under resonance, in addition, the material can inhibit radiation damping through surface plasmon resonance, photons are strongly localized at the nanoscale, and the performance of the material is improved. Therefore, the interaction between the light and the substance is enhanced.

A method for determining a geometry of an optical waveguide, the method comprising: with a ring resonator comprising a predetermined cavity length, analyzing multiple consecutive resonance wavelengths at an operating temperature; performing a constrained numerical optimization process with a regression objective function of the optical waveguide's spectral features to extract dimensions of the optical waveguide, wherein the process minimizes a total mean squared error (MSE) between predicted and measured resonance wavelengths over a selected wavelength range.

The invention discloses an optical fiber sensor based on a viscous metal film as well as a preparation method and an application method. The optical fiber sensor comprises a single-mode optical fiber, a hollow optical fiber and the viscous metal film, the single-mode optical fiber and the hollow optical fiber are welded to form a first reflection interface; the viscous metal film is attached to the tail end of the hollow optical fiber to form a second reflection interface; a hollow cavity filled with air is formed between the first reflection interface and the second reflection interface to form an optical cavity. An optical signal is injected into the optical cavity through the single-mode optical fiber and is reflected for multiple times between the first reflection interface and the second reflection interface to generate an interference signal; the interference signal comprises resonance wavelength or envelope drift information and is used for representing the change of the external environment. According to the technical scheme, core connection can be completed only through one-time welding, the problems of interface deformation and loss caused by multiple-time welding are remarkably reduced, and therefore the structural stability and measurement consistency of a system are improved; and the method has good universality and expandability.

The invention discloses a surface enhanced Raman scattering substrate, a preparation method and application thereof, and belongs to the technical field of Raman spectrum detection, and the surface enhanced Raman scattering substrate sequentially comprises a substrate layer, a distributed Bragg reflector, a chalcogenide phase change material functional layer and a nanoscale metal structure layer from bottom to top. The distributed Bragg reflector is formed by stacking periodic structures composed of dielectric materials with different refractive indexes. The distributed Bragg reflector and the nanoscale metal structure layer are coupled to excite the Tamm state, the chalcogenide phase change material functional layer can achieve reversible regulation and control of the amorphous state and the crystalline state under external light excitation, and the Tamm state resonance wavelength is changed to regulate and control the SERS enhancement effect. High-sensitivity detection is realized through dual enhancement of Tamm state and local surface plasmon resonance, and the sensor has the characteristics of non-volatility, reconfigurability, high reproducibility and flexible design, is convenient to operate and stable in performance, and is suitable for the fields of chemical biosensing, laboratory chip systems, optical encryption and the like.

Highly uniform Fabry-Pérot-based optical ultrasound transducer arrays can be formed on a substrate by surface-micro-machining, using a sacrificial material layer to define the length of a Fabry-Pérot cavity formed between two partially optically reflective layers, and thereby set the optical resonance wavelength of the cavity. The transducer elements of the array can be interrogated in parallel with a laser operating near that resonance wavelength. Various techniques are available to tune the optical and acoustic properties of the transducer elements.