54 results about "Sub wavelength" patented technology

This invention discloses a visible transparent, ultra-wideband microwave absorption structure, comprising, from top to bottom, a visible transparent spatial shielding layer, an impedance-gradient absorption layer, and a total reflection bottom layer. The spatial shielding layer is highly transparent to the microwave band. The impedance-gradient absorption layer is composed of multiple layers of low-dielectric-constant transparent dielectric substrates and an array of transparent conductive patterns disposed thereon, stacked alternately. The total reflection bottom layer is totally reflective to the microwave band. By precisely designing the gradient period and equivalent resistance of the multilayer transparent conductive pattern array, and utilizing the electromagnetic coupling and multi-point resonance mechanism of the upper and lower layers, this invention achieves ultra-wideband microwave strong absorption of more than 90% in the 1-40 GHz frequency band at the subwavelength scale, breaking through the bandwidth limitation bottleneck of traditional microwave absorbing structures; and it also possesses excellent visible light transparency characteristics.

The application relates to a two-stage refractive index gradient mode spot converter based on a metamaterial and a preparation method thereof, and belongs to the technical field of silicon light, wherein the converter comprises a silicon substrate, a buried oxygen layer located on the silicon substrate, a subwavelength grating waveguide structure and a solid waveguide structure located on the buried oxygen layer, and a gradient refractive index upper cladding layer located on the subwavelength grating waveguide structure and the solid waveguide structure; the subwavelength grating waveguide structure and the upper cladding layer can transversely and longitudinally amplify a mode field, can effectively reduce substrate absorption loss, and can increase alignment tolerance; by designing a subwavelength grating duty cycle and an upper cladding layer two-material duty cycle, the refractive index is gradually changed along the light propagation direction, the distribution of light field energy is better controlled, the light field is gradually expanded and adapted in space, the mode mismatch problem can be effectively avoided, and the design freedom is enhanced.

Tunable optical metasurfaces can include an optically reflective surface to reflect optical radiation, such as infrared laser light. An array of optical resonant antennas can extend from or otherwise be positioned on the reflective surface, for example, at sub-wavelength spacing, e.g., less than half a wavelength. Voltage-controlled liquid crystals can be positioned in the optical field region of each optical resonant antenna. A controller can apply a voltage differential bias pattern to the liquid crystals of the optical resonant antennas, which can be arranged in a tiled, staggered, or randomly arranged subset of optical resonant antennas to obtain one-dimensional beam control, two-dimensional beam control, and / or spatial beam shaping.

The application relates to a subwavelength vortex beam array generation method based on a metasurface and belongs to the technical field of polarization optics application. Specifically, the application relates to a two-way vortex beam metasurface design method based on phase control, which solves the problems of complex metasurface unit structure and symmetrical transmission limitation. Then, linearly polarized light is vertically irradiated on the metasurface structure in the positive and negative directions, the spatial symmetry in the electromagnetic wave propagation direction is broken, the full-range phase modulation is realized while the asymmetric transmission characteristic is obtained, the electromagnetic waves incident in the two directions can be independently controlled by changing the size parameters of the unit structure, and vortex beams carrying different topological charge numbers are respectively realized. Compared with other vortex beam generation methods, the method has the advantages of simple structure and easy integration.

The application discloses a high-polarization-extinction-ratio integrated Y waveguide structure based on a thin film lithium niobate, relates to the fields of microwave photonics, integrated optoelectronics and high-precision inertial sensing technology, and comprises a substrate, a lower cladding layer, a thin film lithium niobate layer and an upper cladding layer from bottom to top; and the polarization extinction ratio of the device is significantly improved according to the application; in view of the problem of poor polarization extinction ratio performance of the current monolithic integrated thin film lithium niobate Y waveguide due to the lack of an on-chip efficient polarization structure, the application creatively utilizes mode parity symmetry for filtering; the energy zero point position of the TE1 mode is determined by the waveguide electromagnetic field eigen equation and does not drift with the external environment temperature or stress; unlike the directional coupler relying on nanoscale gaps or the subwavelength grating with a minimum line width; the end-to-end transmission loss of the polarization and filtering of the application can be controlled at a very low level, so that the optical power margin and the overall signal-to-noise ratio of the fiber-optic gyroscope system detection end are significantly improved.

The application provides a Sub-THz focal control superlens antenna based on an Alvarez lens and a design method, and belongs to the technical field of superlens antennas. The antenna is suitable for a Sub-THz frequency band of 100-300 GHz, the antenna adopts a two-layer pure-phase superlens cascade structure, and the pure-phase superlens is composed of superlens unit cells in a subwavelength scale and arranged in an equal-interval mode in the horizontal direction and the vertical direction. By making the upper and lower pure-phase superlenses horizontally and synchronously reversely translate and changing the translation distance, the focal point can be adjusted at a working frequency of 200 GHz, and the focal point control range is 10.02 mm-66.88 mm. The application can break through the bottleneck of the volume, integration, focusing efficiency and cost of a traditional antenna in a sub-terahertz frequency band, realize the miniaturization, light weight and high performance of an antenna system, and provide a reliable antenna solution for related fields such as sub-terahertz communication and radar imaging.

This invention discloses a zero-refractive-index metamaterial structure that operates with arbitrarily polarized incident waves at all angles. The structure mainly consists of multiple identical subwavelength structural units arranged periodically. Each subwavelength structural unit is a metallic regular triangular prism, with electromagnetic waves propagating along its axial direction. Each subwavelength structural unit has an air aperture penetrating it along its axial direction; the air aperture is a single connecting channel. In cross-section, the connecting channel mainly consists of a "Y"-shaped channel and three "V"-shaped channels. The zero-refractive-index metamaterial achieved by this invention exhibits zero phase accumulation characteristics, full-angle impedance matching in free space, and insensitivity to incident wave polarization, showing broad application prospects in electromagnetic stealth, metalenses, and other fields.

A high-quality beam-shaping metasurface device for high-power laser processing belongs to the fields of optics and electromagnetic wave absorption. This invention includes a substrate and an asymmetric Fabry-Perot cavity; artificial micro / nano units include H-shaped, I-shaped, double-rod, double-elliptical, or V-shaped structures. The asymmetric Fabry-Perot cavity is a three-layer composite structure of "metasurface structure layer - dielectric spacer layer - metal," achieving the device's preset low light absorption function through resonant modulation; the metasurface structure layer consists of multiple subwavelength artificial micro / nano units arranged periodically or aperiodically for controlling the transmitted wavefront. This invention achieves customized beam shaping based on topology-optimized artificial micro / nano structure units, and enhances the low absorption capability of the metasurface device based on asymmetric Fabry-Perot cavity structure optimization. This invention maintains high optical efficiency and robustness under high power density conditions, achieving high-precision control of beam energy distribution, phase, and wavefront, enabling customized laser processing.

The application provides a preparation method of an AWG chip, which comprises the following steps: pretreating a wafer; depositing a lower cladding layer and a core layer on the wafer; the lower cladding layer is a silicon dioxide layer, and the core layer is a germanium-doped silicon dioxide layer; preparing a first-order subwavelength structure, a second-order subwavelength structure and a third-order subwavelength structure on the wafer; the first-order subwavelength structure is located in an input slab region of the AWG chip, the second-order subwavelength structure is located in an array waveguide region of the AWG chip, and the third-order subwavelength structure is located in an output waveguide region of the AWG chip; depositing an upper cladding layer on the wafer; the upper cladding layer is a silicon dioxide layer; performing end face cleavage and coupling pre-calibration on the wafer to obtain the AWG chip; and performing performance testing on the AWG chip. In the application, the first-order subwavelength structure, the second-order subwavelength structure and the third-order subwavelength structure are prepared on the wafer, so that the crosstalk of the input slab region, the array waveguide region and the output waveguide region is synchronously suppressed, and the crosstalk is suppressed.

This invention discloses a microring resonant-enhanced on-chip integrated Raman spectrometer, monolithically integrated on a thin-film lithium niobate or thin-film lithium tantalate electro-optic integrated photonic platform. It includes a microring resonant Raman enhancement structure based on a subwavelength grating waveguide, an on-chip spectral resolution unit, and a photodetector. The microring resonant Raman enhancement structure performs the interaction between the Raman excitation light and the sample under test and collects the Raman scattering signal. The on-chip spectral resolution unit is connected to the microring resonant Raman enhancement structure via an on-chip optical waveguide to perform spectral analysis on the enhanced Raman scattering signal. The photodetector is located at the output of the on-chip spectral resolution unit to detect the spectrally analyzed light signal. The advantages of this invention compared to existing technologies are: it provides a microring resonant-enhanced on-chip integrated Raman spectrometer that achieves efficient Raman signal enhancement, on-chip coupled transmission, and spectral analysis, solving the miniaturization and integration challenges of traditional Raman spectral sensing systems.

A high-conversion-efficiency integrated frequency comb device (100; 200; 310a – 310c) comprises at least one micro-resonator (120; 220) configured to receive pump laser light from at least one pump laser source, convert at least partially the received pump laser light for generating a laser frequency comb, and output frequency comb light based on the produced laser frequency comb. The micro-resonator (120; 220) comprises at least one closed-circuit waveguide (122; 222) integrated in a semi-conductor topography of the micro-resonator (120; 220). The closed-circuit waveguide (122; 222) comprises at least one structure for producing periodic perturbation (124; 224) configured to produce mode hybridization via coupling of forwards and backwards travelling modes in the closed-circuit waveguide (122; 222) by means of rapid, in particular sub-wavelength, modulation of a propagation constant of light propagating in the closed-circuit waveguide (122; 222). The structure for producing periodic perturbation (124; 224) has been designed with respect to at least one of an intended width, in terms of comb lines, of the frequency comb and / or an intended intensity distribution within a target width, in terms of comb lines, of the frequency comb, based at least partially on the stipulation that a dispersion-loss operator to achieve an ideally flat microcomb according to an exact solution of a generalized Lugiato-Lefever Equation exists in the form [iD+K], and, as a function of resonator mode index μ, the dispersion-loss operator takes the following generic form: wherein a, b, c, d 3 ... d ∞ , h, p, q, r, s, u 3 , u ∞ are constants, and μ ≤ N / 2 for N being the number of intended comb lines apart from a potential comb line corresponding to the pump laser light.

A method and system for determining the presence of a selected analyte in a sample include an all-dielectric, metasurface sensor having one or more arrays of subwavelength-scale, dielectric nanopillars having anisotropic cross-sections. Nanopillars in selected regions of the metasurface sensor may be functionalized with binders for selectively binding the selected analyte. Methods for detecting the selected analyte in a sample rely on exposing the sensor to a test sample, probing the sensor with probe light having a selected polarization state, and comparing the polarization state of output light reflected or transmitted by functionalized regions of the sensor with a baseline polarization state of output light determined with a sample lacking the selected analyte.

This invention relates to the field of antenna technology and discloses a method for correcting assembly errors in planar reflective array antennas. It aims to address the problems of existing assembly processes failing to maintain subwavelength-level accuracy, traditional compensation methods being unable to dynamically detect non-uniform deformation and local misalignment, and lacking the ability to jointly model multi-dimensional coupling errors. The method includes: constructing a digital twin model containing the theoretical positions and phase configurations of the reflective elements; acquiring spatial coordinates and radiation field data under the actual assembly state through 3D scanning and near-field measurement; establishing the mapping relationship between element position deviation, angle deflection, beam pointing error, and gain loss; identifying key error patterns and distribution regions using principal component analysis and spatial clustering; calculating the required phase correction for each element and generating a compensation distribution map. This application enables accurate perception, adaptive compensation, and online correction of assembly errors, significantly improving antenna gain, sidelobe suppression capability, and beam pointing accuracy.

This application provides an optical imaging lens, including a lens barrel, a lens group assembled within the lens barrel, and a plurality of spacer elements. The lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequence along the optical axis from the object side to the image side. At least one surface from the object side of the third lens to the imaging plane is a metasurface with a subwavelength microstructure. The plurality of spacer elements includes a second spacer element, a third spacer element, and a fourth spacer element. The optical imaging lens satisfies: 15.40≤f / ImgH×fno≤16.00; 1.95≤Tr1r6 / Tr7r10≤4.86; 2.60<EP34 / EP23≤4.41.

This invention discloses an optical waveguide module, relating to the field of optical device technology. It includes a substrate, an optical waveguide layer on top of the substrate, and a buffer layer with a continuously curved, wave-shaped design between the substrate and the waveguide layer. This invention forms a stress-relieving structure based on the wave-shaped buffer layer, substrate, and waveguide layer, achieving thermal expansion coefficient matching and bending stress dispersion between the substrate and the waveguide layer. Simultaneously, combined with various adhesion enhancement layers, it ensures the long-term stability of the multi-layer interface. Furthermore, the input coupling layer employs a composite design of a blazed grating and a subwavelength grating, significantly improving the coupling efficiency from visible light to near-infrared. The output coupling layer achieves wide field-of-view output through a gradient periodic grating, adapting to large viewing angle requirements. Additionally, it integrates a modulator and a graphene thermal conductive layer, simultaneously solving the problems of high-speed modulation and heat dissipation, significantly improving the optical performance, thermal stability, and mechanical reliability of the optical waveguide module.

The invention relates generally to optically high transparency and high haze structures and, more particularly, to plastic, e.g., polymer, and glass structures having a sub-wavelength texture formed on a surface thereof, which is effective to impart the optical properties of high transparency and high haze to the structures. The texture is in a grass-like or needle-like form. Additionally, the optically high transparency and high haze structures may include a transparent conductor. Furthermore, the glass structures may exhibit a self-cleaning function.

The application discloses a kind of subwavelength structure embedding disorder super-uniform solid waveguide and design method thereof, it is related to optoelectronic device technical field, including waveguide, waveguide includes core layer and cladding, cladding is arranged in waveguide both sides, disorder super-uniform solid is composed of grid wall and hole structure, simultaneously provided with waveguide defect line, waveguide defect line is provided with subwavelength structure, subwavelength structure is arranged along waveguide defect line direction.The application uses the above-mentioned one subwavelength structure embedding disorder super-uniform solid waveguide and design method thereof, by embedding the subwavelength structure of multiple layers of medium in the core area of waveguide defect line, the interaction of optical field and surrounding environment gas molecule to be measured is enhanced, the sensitivity of gas sensor is improved.By optimizing the distribution mode and geometric parameters of subwavelength structure, the additional transmission loss introduced can still be kept at a low level while enhancing the evanescent field of waveguide.

This application provides a three-terminal tandem solar cell based on a silicon nanowire structure, relating to the field of solar cell technology. In the perovskite top cell of this application, a first electrode layer is provided facing the incident light, while in the crystalline silicon bottom cell, a second and third electrode layer are provided facing away from the incident light. Furthermore, multiple nanowire structures are spaced apart on the side of the N-type silicon absorber layer facing the incident light. The nanowire structure can enhance the coupling and propagation of long-wavelength photons to the N-type silicon absorber layer through waveguide effects and light field modulation, and it exhibits subwavelength optical characteristics, achieving anti-reflection effects over a wide spectral range and improving the absorption efficiency of the crystalline silicon bottom cell for long-wavelength photons. In addition, by setting a three-electrode structure, the overall energy output performance of the cell is improved.

The application relates to the technical field of optoelectronic materials and devices, and discloses a wide-spectrum-response photodetector and a preparation method thereof. The core composite photoactive layer of the photodetector comprises a germanium-tin alloy layer, a tin sulfide interface layer and a perovskite metasurface layer from bottom to top. The germanium-tin alloy layer with gradient tin content is prepared through magnetron sputtering, the tin sulfide interface layer is formed in situ through sulfuration during annealing, the narrow-band-gap perovskite metasurface layer with a subwavelength periodic structure is prepared through a solution method combined with a nanoimprint technology, and finally, the complete wide-spectrum photodetector is assembled. The tin sulfide interface layer realizes gradient band matching and interface defect passivation, the perovskite metasurface layer enhances the light field localization effect, and the two are coordinated to make the photodetector realize ultraviolet-visible-mid-infrared full-band response, and the photodetector is compatible with a silicon CMOS process, has excellent stability, is suitable for optical communication, multispectral imaging and the like scenes, and has important industrial application value.

This invention relates to a dual-broadband high-symmetry polarization conversion metasurface, comprising a plurality of subwavelength units arranged periodically along a two-dimensional plane. Each subwavelength unit includes a dielectric substrate, a metal pattern layer, and a reflective layer. The surface profile of the dielectric substrate is square. The metal pattern layer is disposed on the front side of the dielectric substrate and includes a resonant ring portion and a central resonant portion. The resonant ring portion is a square ring structure, with openings formed at the midpoints of its upper and left straight edges, while the other two straight edges do not form openings. The extension direction of the openings is perpendicular to the corresponding straight edges. The central resonant portion includes two metal straight segments connected to form a cross-shaped structure, with the length directions of the two metal straight segments correspondingly pointing to the two openings. The reflective layer is a metal layer covering the back side of the dielectric substrate. The center-to-center distance between adjacent subwavelength units is equal to the side length of the front side of the dielectric substrate.

This invention relates to the fields of electromagnetic shielding and micro / nano photonics, and discloses a near-field shield based on layered hyperbolic metamaterials and its fabrication method. The shield is constructed by stacking a substrate, a layered hyperbolic metamaterial, and a capping layer sequentially from bottom to top. The layered hyperbolic metamaterial is composed of alternating metal and dielectric layers, with each functional layer having a subwavelength thickness. The capping layer is located on the outermost side to provide impedance matching and physical protection. In this subwavelength layered structure, utilizing its unique hyperbolic dispersion characteristics in the operating wavelength band, external near-field evanescent waves can be efficiently coupled into volume modes within the structure, and absorbed and dissipated through the ohmic loss of the metal layers, thereby blocking electromagnetic energy penetration towards the substrate. This invention features a compact structure and process compatibility, effectively solving the problem of near-field signal crosstalk between adjacent components in high-density optoelectronic integrated circuits, and has significant application value in the electromagnetic compatibility design of on-chip optical interconnects and nanophotonic devices.

The application discloses a waveguide bending structure based on a subwavelength Micallan lens and belongs to the technical field of integrated optics, which comprises an input port, an output port, a subwavelength Micallan lens, a first subwavelength taper coupler, a second subwavelength taper coupler, an insulator cladding, an insulating layer and a substrate layer; the input port and the output port are symmetric about the center of the subwavelength Micallan lens; the first subwavelength taper coupler, the subwavelength Micallan lens and the second subwavelength taper coupler are all composed of a periodic subwavelength grating structure; the subwavelength Micallan lens is composed of basic lens units arranged periodically with a large duty cycle on both sides and a small duty cycle in the middle, and the effective refractive index distribution thereof satisfies the reciprocal function of the hyperbolic cosine; the structure can realize low-loss and high-isolation optical path bending in a short propagation distance, break through the physical restriction between the bending radius and the bending loss, and is suitable for photonic integrated circuits and optical information processing chips.

The present application relates to a kind of composite optical film with anti-reflection and heat dissipation function and its preparation method, comprising: from top to bottom sequentially stacked nano anti-reflection layer, heat-conducting-light-transmitting composite layer and heat radiation layer;Wherein, heat-conducting-light-transmitting composite layer includes the first TPI film layer doped with BNNT, and ITO heat-conducting grid is provided on the surface of the first TPI film layer doped with BNNT;Nano anti-reflection layer is arranged on the opposite surface of the heat-conducting-light-transmitting composite layer with ITO heat-conducting grid, and the opposite surface is provided with subwavelength conical grating structure ≤380nm;Heat radiation layer includes the second TPI film layer and CQDs screen printed thereon, and the thickness of heat radiation layer is 10 μm ~ 12 μm;The total thickness of composite optical film is 50 ~ 200 μm.The present application realizes excellent anti-reflection performance and efficient heat-conducting+radiation heat dissipation capacity simultaneously under the premise of not sacrificing light transmittance and thickness control through the three-layer integration structure of " nano anti-reflection layer + BNNT / ITO heat-conducting-light-transmitting composite layer + CQDs heat radiation layer".

The application discloses a filter based on a multi-mode subwavelength grating. The filter comprises a mode demultiplexer for multiplexing and demultiplexing of a base mode and a high-order mode, a subwavelength grating for weakly binding regulation of a mode field of the base mode and the high-order mode, and a straight-through waveguide for output of the base mode. The application introduces a structure of the subwavelength grating and weakly binding regulation of the mode field, and by virtue of excellent flat dispersion regulation characteristics, the application realizes apodization of the grating while keeping consistent local refractive index of the grating, thereby obtaining the filter with high side mode suppression ratio and no free spectral range limitation, and the filter can realize flat and low-loss spectral response, meets the next-generation large-capacity and high-speed wavelength division multiplexing transmission demand, and has the advantages of simple structure, simple process, excellent performance and the like.

The application provides a super-structured optical fiber for generating a spindle beam and an optical acoustic endoscopy imaging system, the super-structured optical fiber comprising a fiber body and a super-structured optical structure arranged at an exit section of the fiber body, the super-structured optical structure comprising an optical expander and a super-structured structure array arranged at the end of the optical expander; the super-structured structure array is periodically arranged by super-structured units in a sub-wavelength scale, and the super-structured unit is in the form of a regular quadrangular prism; by clear phase modulation and parameter optimization, the super-structured optical structure is integrated at the end face of the fiber body, the emission light wave front is accurately regulated, a long focal depth spindle beam is obtained under the condition of a limited aperture and a compact structure, and the problem that the focal depth is limited in optical acoustic endoscopy imaging is effectively relieved; based on the combination of Bessel beams and the lateral spot size, the application maintains a high lateral resolution ability while extending the focal depth, avoids the defect that the resolution is significantly reduced in the traditional zooming scheme, and improves the imaging consistency and the signal-to-noise ratio.

This invention discloses an ultra-narrowband optical filter and its design method, belonging to the field of micro-nano optical device technology. It is a reflective all-dielectric guided-mode resonant filter, comprising, from bottom to top, a substrate, a planar waveguide layer, a single-layer one-dimensional subwavelength grating layer, and a single-layer anti-reflection film. The design method includes initial tuning of the resonant wavelength, optimization of the ultra-narrowband bandwidth, fine-tuning of the resonant wavelength, and synergistic optimization of sideband suppression. It clarifies the priority of adjusting each structural parameter, achieving narrowband reflection filtering through the guided-mode resonance effect of the grating and waveguide layer. Through the synergistic design of the single-layer anti-reflection film and the resonant structure, non-resonant broadband background reflection is suppressed without disrupting the ultra-narrowband resonant peak. At the target filtering wavelength of 1064nm, an ultra-narrowband filter with a peak reflectivity of 100% and a full width at half maximum (FWHM) as low as 0.03nm can be achieved, with a sideband suppression ratio exceeding 30dB. This solves the core defect of existing technologies that cannot simultaneously achieve ultra-narrowband filtering and high sideband suppression ratio.

This invention relates to the field of infrared optoelectronics, specifically to a method for applying coating-based electric field modulation technology to infrared waveguides. The method includes: providing a pair of opposing waveguide electrodes to form a waveguide structure; depositing a multilayer gradient dielectric constant insulating coating on a localized region of the waveguide electrodes' surface; setting a subwavelength dual-grating structure at the edge of the multilayer gradient dielectric constant insulating coating; integrating a programmable metasurface dynamic electric field modulation layer above the multilayer gradient dielectric constant insulating coating for dynamically adjusting the local electric field distribution; and setting a closed-loop adaptive impedance matching network on both sides of the waveguide electrodes and the coating. This invention alters the conductivity and effective dielectric environment of the waveguide electrode surface through the multilayer gradient dielectric constant insulating coating, weakening the local electric field intensity and forming a weakened electric field region along the propagation direction. This suppresses higher-order modes and preferentially propagates lower-order modes, achieving efficient and programmable mode selection and electric field modulation in infrared waveguides.

The application discloses a glass surface enhanced Raman substrate and a femtosecond laser preparation method thereof, and belongs to the fields of optics, materials and biology and the like.The femtosecond laser preparation method of the glass surface enhanced Raman substrate disclosed by the application constructs a composite micro-nano structure with a micron skeleton structure, a subwavelength stripe and a nano protrusion through two-stage femtosecond laser processing, realizes high-density and uniform distribution of hot spots, and significantly improves an enhancement factor and a signal-to-noise ratio of the glass surface enhanced Raman substrate.A precious metal plating layer with a thickness difference / gradient is prepared, electromagnetic enhancement effects and local structure optimization of different regions are realized, and sensitivity and stability of the SERS substrate are improved.The consistency and repeatability of batch preparation are ensured by standard Raman probe molecule calibration, selection of optimal laser parameters, film thickness and reconstruction conditions.The Raman signal of the glass substrate itself is very weak, background noise interference is effectively avoided, and reliability and stability of a detection result are improved.

This invention relates to an FBG grating demodulator based on a silicon nitride photonic filter chip, belonging to the field of fiber optic sensing technology. The demodulator includes a broadband light source, an optical circulator, an FBG sensor array, a silicon nitride photonic filter chip, a photodetector, an electrical amplifier, an ADC data acquisition card, a digital filter (FPGA), and a computer processing unit. The silicon nitride photonic filter chip integrates a micro-ring resonant cavity, a subwavelength grating dispersion modulation structure, and a thermo-optical tuning electrode, achieving continuous, high-speed, and linear wide-range wavelength coordination through the thermo-optical effect. Furthermore, it employs peak deconvolution and lookup table algorithms for wavelength demodulation. This invention enables multi-channel distributed measurement on a single fiber channel. With no moving mechanical parts, this invention is small in size, has a long lifespan, is resistant to static electricity, offers high detection accuracy, good stability, good vibration resistance, a high tolerance threshold, and low manufacturing cost. It is suitable for various fields such as infrastructure safety monitoring, the energy industry, aerospace, and optical communication, and has broad application prospects.