72 results about "Localized surface plasmon" patented technology

The invention relates to an optical fiber hydrogen sensor based on a silver film-nanowire hole array structure and a preparation method thereof in the field of photochemical sensors. The optical fiber hydrogen sensor comprises a multimode optical fiber, and a sensing area is formed on the multimode optical fiber; the sensing area is formed by stripping a coating layer with a preset length from the multimode optical fiber, thinning the optical fiber in the area, plating a silver film on the surface of the thinned optical fiber, and adsorbing a nanowire hole array structure which is sequentially and vertically arranged on the surface of the silver film in a liquid level self-assembly manner; the nanowire hole array is of a metal-medium-metal (MIM) structure, a gold-palladium nanowire array is arranged at the bottom, an intermediate medium layer is made of aluminum oxide, and a silver film with a hole array in any shape is arranged at the top. When light is transmitted to a sensing area from a fiber core of the multimode optical fiber, the light and a metal silver film can excite a surface plasmon resonance (SPR) effect, meanwhile, an MIM structure formed by a gold-palladium nanowire, an aluminum oxide dielectric layer and a porous silver film serves as an optical coupling antenna through a local surface plasmon resonance (LSPR) effect at the edge of a top hole, and the optical coupling antenna is used for transmitting the light to the sensing area. Light energy is efficiently converged and excited in an extremely bound gap plasmon (Gap Plasmon) in an aluminum oxide dielectric layer, so that far-unconventional electromagnetic field enhancement is generated in a sensing core area, and the sensitivity of the sensor is greatly improved.

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.

The invention discloses a preparation method of an MF (at) NH2 (at) Ag SERS (Surface Enhanced Raman Scattering) sensor for detecting paraquat and diquat, belongs to the field of nano material synthesis and spectral analysis, and solves the problems that a traditional detection method is complicated in process and cannot detect pesticides and free radicals thereof at the same time, and a traditional SERS substrate is poor in enhancement effect and low in stability. The preparation method comprises the following steps: firstly segmenting melamine foam, cleaning and drying, soaking in hydrochloric acid, soaking in a polyethyleneimine aqueous solution to modify amino, drying, soaking in a silver nitrate solution for ultrasonic treatment, adding a sodium borohydride solution under an ice bath, stirring and reducing, and finally cleaning and drying to obtain the sensor. The sensor takes three-dimensional melamine foam as a support, silver nanoparticles are uniformly loaded on the surface of the three-dimensional melamine foam, paraquat, aquacide and free radicals thereof are enriched through electrostatic interaction based on a localized surface plasma resonance principle, and Raman signal enhancement is realized. The detection limit is 10 <-9 > mol / L, the signal stability and repeatability are excellent, the applicability to actual water sample detection is good, the detection of other pesticides can be expanded, and the method is suitable for on-site rapid trace detection.

The invention discloses a reconfigurable singular point sensor based on high-Q-value artificial local surface plasmon and a working method. The sensor comprises an annular artificial local surface plasmon resonator, medium disturbance particles for regulating and controlling reconfigurable singular points, a medium substrate and a microstrip line located on the upper surface of the medium substrate. The annular artificial local surface plasmon resonator is suspended and supported by the metal ring, and the microstrip line is located near the resonator so as to effectively excite multi-mode resonance. By accurately regulating and controlling the positions of the two movable Rayleigh scatterers, three singular points of an octopole resonant mode, a ten-pole resonant mode and a twelve-pole resonant mode are continuously realized respectively, and the sensitivity of deep sub-wavelength target particles is remarkably enhanced. The sensor provided by the invention provides a highly flexible and reconfigurable platform for realizing a singular point sensing system with a single artificial local surface plasmon resonator, and paves a way for high-sensitivity particle detection from a microwave frequency band to a terahertz frequency band.

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 erbium-doped zinc selenide composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving zinc nitrate hexahydrate and erbium nitrate hexahydrate in deionized water, wherein the molar ratio of erbium ions in the zinc nitrate hexahydrate is 0.02-0.08; adding sodium selenite and sodium hydroxide; adding a reducing agent hydrazine hydrate; after hydrothermal reaction for h, washing and drying to obtain the erbium-doped zinc selenide composite material. The material is of a cubic phase ZnSe structure, erbium is uniformly doped in crystal lattices, and the material is in a nearly spherical particle shape. Rich 4f electronic defect states are introduced into a ZnSe band gap through erbium doping, charge transfer (chemical enhancement) is remarkably promoted, the free carrier concentration is improved to excite localized surface plasma resonance (electromagnetic enhancement), and the synergistic effect of two enhancement mechanisms is achieved. The detection limit of the SERS substrate to methylene blue is as low as 3.24 * 10 <-8 > mol / L, the enhancement factor is as high as 1.73 * 10 < 4 >, and a new way is provided for environmental pollutant monitoring.

The invention relates to the technical field of biomedical sensing and wearable health monitoring, and discloses a photoelectrochemical sensing microneedle, a preparation method thereof, a monitoring system and a detection method. The sensing microneedle comprises a swellable dual-network hydrogel microneedle substrate, a three-dimensional conductive network and a semiconductor nanostructure, wherein the three-dimensional conductive network is composed of high-length-diameter-ratio metal nanowires with a local surface plasma resonance effect, and the semiconductor nanostructure is compounded on the surfaces of the metal nanowires and forms a Schottky heterojunction. The mechanical constraint of the rigid polymer skeleton and the high length-diameter ratio of the metal nanowire cooperate to ensure the continuity of the conductive network in a swelling state. Under the irradiation of exciting light, hot electrons are migrated to the surface of a semiconductor through a Schottky junction built-in electric field to generate reactive oxygen free radicals, non-enzymatic catalytic oxidation is carried out on a target analyte in interstitial fluid under zero bias voltage or low bias voltage, a photocurrent signal is generated, and integration of minimally invasive sampling and in-situ high-selectivity detection is realized.

The application discloses a method for preparing high-entropy alloy based on laser-induced local surface plasmon resonance effect. 2+ , Pd 2+ , Ru 3+ , Rh 3+ , Ir 3+ salt solution; then, the colloid and the noble metal ion salt are thoroughly mixed and uniformly distributed by using ultrasonic and magnetic stirring; finally, the uniformly mixed solution is irradiated by using a modulated 532nm waveband nanosecond pulse laser for 20 minutes, and gold-based high-entropy alloy single-crystal nanoparticles with uniform size can be obtained. The gold colloid and the reduced Pt, Pd and other metals rapidly nucleate and crystallize to generate high-entropy alloy under the promotion of configuration entropy.

The invention relates to an X-ray scintillator imaging system based on surface enhanced Raman scattering, X-rays emitted by an X-ray source penetrate through a sample and then enter a scintillator, the scintillator converts the X-rays into visible fluorescence, small-angle fluorescence directly escapes, and large-angle fluorescence is totally reflected to form evanescent waves; the metal nano array on the surface of the scintillator acts with evanescent waves to excite localized surface plasmon resonance, the Raman scattering substance generates surface enhanced Raman scattering under the action of the metal nano array, and the intensity distribution of the localized surface plasmon resonance is converted into the light intensity distribution of Raman scattering light; raman scattering light is focused by a lens and filtered by a filter and then is received by a surface detector, and an image containing high-frequency information of a sample space is output. The invention also relates to an X-ray scintillator imaging method based on surface enhanced Raman scattering. The surface enhanced Raman scattering technology is overcome, effective utilization of high-frequency information is achieved, and new possibility is provided for development of the X-ray imaging technology.

The invention discloses a composite material with high photothermal conversion performance and a direct mixing method and a core-shell structure method for preparing the material. The composite material with high photothermal conversion performance comprises a photothermal matrix material and a down-conversion fluorescent material, the photo-thermal base material comprises nano tungsten bronze and / or nano rare earth hexaboride; the down-conversion fluorescent material comprises Gd < 2.4 > Lu < 0.45 > Ga < 3.87 > AlO12 doped with Cr < 3 + > / Yb < 3 + > / Nd < 3 + > and / or Li2Mg < 0.99 > Zr < 1.985 > O4 doped with Cr < 3 + > / Yb < 3 + > / Nd < 3 + >. The composite material is prepared from the photo-thermal base material and the down-conversion fluorescent material through a direct mixing method and a core-shell structure method, visible light can be converted into near-infrared light, the near-infrared light is absorbed by the photo-thermal base material through local surface plasmon resonance and efficiently converted into heat energy to be output, the spectral response range is expanded, and the conversion efficiency is improved. The limitation that a traditional photo-thermal material only utilizes near infrared rays is broken through, the visible light utilization rate is increased, the photo-thermal conversion efficiency of the material is remarkably improved, meanwhile, the cost is reduced, and good application prospects are achieved.

The invention discloses a wide-spectrum high-uniformity black silicon integrated nanogold quadrant detector and a preparation method thereof, the wide-spectrum high-uniformity black silicon integrated nanogold quadrant detector comprises a substrate base material, a micro-nano conical B-Si structure is etched on the substrate base material, gold nanoparticles are deposited and covered on the surface of the micro-nano conical B-Si structure, the photoelectric detector is a double-four-quadrant photoelectric detector, and the thickness of the double-four-quadrant photoelectric detector is larger than that of the micro-nano conical B-Si structure. And the boundary area of the double four quadrants is electrically isolated by etching deep grooves and filling oxygen-silicon compounds to form isolation grooves. The gold nanoparticles are compounded on the surface of B-Si, hot electrons can be excited through a localized surface plasma resonance mechanism and injected into a black silicon conduction band to participate in the photoelectric conversion process, the band gap limitation of the B-Si material is broken through, wide spectral response is achieved, the response capability in a near-infrared region is improved, and the photoelectric conversion efficiency is improved. And meanwhile, a silicon oxide and silicon nitride passivation film is introduced to the surface of the black silicon and gold nanoparticle composite structure, and a surface carrier recombination process is inhibited by filling dangling bonds and defect states on the surface of the black silicon pointed cone structure, so that the dark current level of the device is reduced.

This invention discloses a high photothermal conversion performance composite material and a direct mixing method and a core-shell structure method for preparing the material. The high photothermal conversion performance composite material includes a photothermal matrix material and a downconversion fluorescent material; the photothermal matrix material includes nano-tungsten bronze and / or nano-rare earth hexaborides; the downconversion fluorescent material includes Cr-doped materials. 3+ / Yb 3+ / Nd 3+ Gd 2.4 Lu 0.45 Ga 3.87 AlO 12 and / or doped with Cr 3+ / Yb 3+ / Nd 3+ Li2Mg 0.99 Zr 1.985 O4. This invention uses a direct mixing method and a core-shell structure method to create a composite material from a photothermal matrix material and a downconversion fluorescent material. This composite material can convert visible light into near-infrared light, which is absorbed by the photothermal matrix material through localized surface plasmon resonance and efficiently converted into heat energy output. This expands the spectral response range, breaks through the limitation of traditional photothermal materials that only utilize near-infrared light, improves the utilization rate of visible light, significantly improves the photothermal conversion efficiency of the material, and also reduces costs, showing good application prospects.

The utility model relates to the field of optical detection, in particular to a pear-shaped optical fiber, a pear-shaped optical fiber LSPR (Localized Surface Plasmon Resonance) and a monitoring device. The pear-shaped optical fiber LSPR is formed by processing a multimode optical fiber and comprises a pear-shaped structure and an optical fiber structure, the optical fiber structure is connected with the pear-shaped structure, and the maximum outer diameter of the pear-shaped structure is 0.4 mm-0. 9mm. The optical fiber LSPR disclosed by the utility model can be used for rapidly acquiring the weak change of the refractive index along with the blood coagulation process of human serum and obtaining a PT result within 1 minute. The monitoring method has the advantages that the device is portable, the operation is simple, the analysis is rapid, the household PT monitoring is expected to be realized, and a potential solution is provided for the household self-management of the anticoagulant medicine of the atrial fibrillation patient.

A photoelectric conversion element including a thin film composed of a transition metal dichalcogenide and formed on a base material. In the present invention, a surface of the thin film composed of the transition metal dichalcogenide is modified with at least any nanorod particles of Au nanorod particles composed of Au and Ag nanorod particles composed of Ag. An average aspect ratio of the Au nanorod particles is 3.0 or more and 12.0 or less, and an average aspect ratio of the Ag nanorod particles is 3.0 or more and 13.0 or less. In the invention, the sensitivity to light having wavelengths in the near-infrared region improves by a sensitizing action attributed to localized surface plasmon resonance that is developed by the Au and Ag nanorod particles.

The invention discloses a method for ratio type colorimetric detection of perchlorate. The method comprises the following steps: performing specific surface modification on gold nanoparticles, constructing a methylene blue functionalized gold nanoparticle (MB (at) AuNPs) colorimetric probe, inducing a particle aggregation effect by utilizing specific interaction between perchlorate and MB (at) AuNPs, triggering red shift of a localized surface plasma resonance absorption peak of the probe, and detecting the concentration of the MB (at) AuNPs. And a 523 nm (dispersed state characteristic peak) and 660 nm (aggregation state characteristic peak) dual-wavelength absorption signal is formed. Ratio-type quantitative analysis is realized by calculating the ratio (A660 / A523) of the absorbance of the two wavelengths, and the defect that single-signal detection is easily influenced by environmental fluctuation and system condition change is effectively avoided. Based on the response characteristics, a dual quantitative relation between the ratio of the concentration of the perchlorate to the absorbance and the ratio of the color intensity of an image collected by the smart phone is further established, and an ultraviolet-visible spectrophotometry-smart phone image analysis dual-mode detection system is constructed. Wherein the detection limit of the spectrum detection mode is 2.77 [mu] M, and the detection limit of the smart phone auxiliary detection mode is 5.63 [mu] M. The method is simple and convenient to operate, does not need a large-scale analytical instrument or complex sample pretreatment, has the advantages of good sensitivity, stability and visual discrimination, can quickly realize on-site screening and accurate quantification of perchlorate in water and food samples, and is high in practicability and wide in popularization prospect.

The application discloses a perfect absorption device based on a dielectric grating and having an ultrahigh quality factor. The perfect absorption device comprises a substrate, a dielectric grating and a metal microstructure, wherein the dielectric grating is located on the substrate, and the metal microstructure is periodically arranged on protrusions of the dielectric grating, so that guided modes (GMs) are excited in a non-resonance region of a localized surface plasmon resonance (LSPR), thereby realizing perfect absorption with an ultrahigh quality factor. The device structure of the application realizes double-band near-perfect absorption in a near-infrared region and a high quality factor (Q >= 8115), and obtains the highest quality factor of near-perfect absorption in a currently known plasmonic system, and is a perfect absorption device with excellent performance.

To provide fluorescence-enhancing nanoparticles that do not reduce the fluorescence intensity of fluorescent dyes, but rather further enhance the fluorescence intensity.SOLUTION: Provided are fluorescence-enhancing nanoparticles comprising core-shell nanoparticles formed of a core particle and a shell, at least one fluorescent dye, and a spacer located between the core-shell nanoparticles and the fluorescent dye, the fluorescent dye having an excitation wavelength and a fluorescence wavelength, the core-shell nanoparticles having a maximum wavelength of localized surface plasmon resonance, the core-shell nanoparticles being metal nanoparticles composed of a combination of a silver core particle and a gold shell or a combination of a gold core particle and a silver shell, and the spacer being single-stranded DNA.SELECTED DRAWING: Figure 1

The invention provides a ZnO / Co3O4 / Ag ternary composite material and a preparation method and application thereof, and belongs to the technical field of composite material preparation. The ZnO / Co3O4 / Ag ternary composite material has a core-shell structure, ZnO is used as an inner core, the surface of the inner core comprises a Co3O4 layer and an Ag layer which are sequentially stacked from inside to outside, the structure can effectively inhibit leaching of transition metal ions, the interface electron transfer efficiency is enhanced through the local surface plasma resonance effect of the Ag layer, and the performance of the composite material is improved. The ZnO / Co3O4 / Ag ternary composite material has the advantages that the ZnO / Co3O4 / Ag ternary composite material has rich Ov and follows the reaction path of PMS-> HSO5-> < 1 > O2, and efficient degradation of refractory EE2 is achieved by means of the fact that < 1 > O2 shows good high-selectivity attack ability on organic pollutants rich in electrons.

The application provides a cheap and simple method for regulating and controlling reduction products of photochemical reactions driven by plasmons at an interface, and belongs to the technical field of catalysis.The application can realize high selectivity and high efficiency of reduction of p-mercaptobenzoic acid (PMBA) molecules adsorbed on silver nanoparticles to generate thiophenol (TP), p-mercaptobenzaldehyde (PMBALD) or p-mercaptobenzyl alcohol (PMBALC) by adjusting excitation of localized surface plasmon resonance (LSPR) and the concentration of silver nitrate.In the method, the generation selectivity of TP, PMBALD or PMBALC is close to 100% by fine tuning the concentration of silver nitrate, and the generation selectivity of PMBALD or PMBALC is realized by regulating excitation power, excitation wavelength and excitation time of plasmon resonance (LSPR).

Disclosed herein includes a nanoplasmonic sensor for molecular characterization of human papillomavirus (HPV), and diseases and disorders associated with HPV infection. In some embodiments. the nanoplasmonic sensor can also be used at the point-of-care. The nanoplasmonic sensor utilizes an optical phenomenon that occurs between a metal nanoparticle and a dielectric—localized surface plasmon resonance (LSPR)—for the detection of viral nucleic acids. In some embodiments. the spectral peak shift is a function of target sequence concentration.

This antigen measurement method comprises: a step for preparing a measurement substrate 10A which includes a substrate 110 that has a first main surface 110a and a second main surface 110b facing each other in the thickness direction, and a plurality of metal bodies 120 that is provided at intervals from each other along the first main surface 110a of the substrate 110; a step for preparing a measurement material 20 which contains metal particles 210; a step for bringing a measurement object containing an antigen 310 into contact with the measurement material 20, thereby preparing a measurement sample 30 which contains antigen-attached metal particles 410 in which the antigen 310 is bonded to the metal particles 210; a step for bringing the measurement sample 30 into contact with the measurement substrate 10A, thereby bonding the antigen-attached metal particles 410 to the measurement substrate 10A at positions that are different from the positions of the metal bodies 120 on the first main surface 110a of the substrate 110; and a step for measuring reflection absorption properties due to localized surface plasmon resonance from the first main surface 110a side of the substrate 110 of the measurement substrate 10A before and after the bonding of the antigen-attached metal particles 410 to the measurement substrate 10A, thereby measuring changes of the reflection absorption properties before and after the bonding of the antigen-attached metal particles 410 to the measurement substrate 10A.

This invention discloses an Ag-Bi 24 Br 10 O 31 This paper discusses the preparation and application of Bi₂O₂S heterojunction composite materials, belonging to the field of SERS detection technology. First, Bi₂O₂S heterojunction composite materials are prepared using a hydrothermal method. 24 Br 10 O 31 Nanosheets, then with Bi 24 Br 10 O 31 Bi2O2S was constructed by secondary hydrothermal in-situ growth of Bi2O2S on nanosheets as a substrate. 24 Br 10 O 31 A Bi₂O₂S heterostructure was formed, followed by chemical reduction to load Ag nanoparticles, and then dried to obtain the target composite SERS substrate. This material utilizes the localized surface plasmon effect of Ag to form a strong SERS "hot spot," exhibiting excellent Raman enhancement performance for crystal violet, enabling highly sensitive detection of crystal violet. This method is simple, uses readily available raw materials, and produces a material that combines excellent SERS enhancement performance with photocatalytic activity, showing broad application prospects in environmental monitoring and pollution control.

A marking substance is provided with a metal-resin composite (100) having a resin particle (10) and a plurality of metal particles (20) immobilized on the resin particle (10). The metal-resin composite 100 has a CV value of the particle diameter D1 of 6% or less, and when the mode of the particle diameter of the metal-resin composite is [nm], the abundance ratio of a substance having a particle diameter smaller than * 0.94 is 10% or less. In an immunoassay, the amount of an analyte contained in a sample is quantified on the basis of the color development intensity of a light energy absorption source due to localized surface plasmon resonance and / or electron migration of the metal-resin composite (100) in the labeling substance.

The application provides a kind of plasmonic enhancement phototransistor structure, detection array and photoelectric detection method, the phototransistor structure includes thin film transistor and the Schottky photodiode with localized surface plasmon effect being arranged on the gate dielectric layer of thin film transistor;Wherein, photodiode includes receiving layer, first insulating layer, transparent gate electrode layer is formed on the first insulating layer and N super surface groove structure is formed in transparent gate electrode layer.The Schottky photodiode with localized surface plasmon effect is arranged on the gate dielectric layer of thin film transistor, can utilize the hot carrier generated by photodiode under localized surface plasmon effect to change the potential distribution in the channel layer of thin film transistor and gate voltage, to realize the exponential amplification of weak hot carrier signal generated by surface plasmon effect, effectively improve the sensitivity and signal-to-noise ratio of plasmonic photodetector.

A composition comprising gold nanoparticles which are linked to polyclonal antibodies. The composition may be used to detect the presence of a target which binds to the polyclonal antibody in solution. The binding of the target to the polyclonal antibody triggers a self-assembly of the polyclonal antibody and the gold nanoparticles. This self-assembly of the polyclonal antibody and the gold nanoparticles triggers a colour change in the surface plasmon of the gold nanoparticles which indicates the presence of the target.

Methods for the dehydrogenation of an alkane to a product are provided, comprising exposing an alkane to heat and light in the presence of a nanostructured photocatalyst comprising a plasmonic metal and a dopant metal, wherein the light generates localized surface plasmon resonances in the nanostructured photocatalyst and the alkane undergoes dehydrogenation to produce a product.

The invention provides a humidity response dynamic regulation type textile as well as a preparation method and application thereof. The humidity response dynamic regulation type textile comprises a fabric layer which comprises hydrophilic fibers with the initial twist degree, and the twist degree of the hydrophilic fibers is increased along with increase of humidity; the composite functional layer is formed on the hydrophilic fibers of the fabric layer and comprises first nano-particles and second nano-particles, the first nano-particles have an infrared emission function, and the second nano-particles are metal nano-particles and have a local surface plasma resonance effect. The humidity response dynamic regulation type textile provided by the invention has an obvious reversible humidity response characteristic, the twist of the hydrophilic fiber and the macroscopic porosity of the fabric layer can be increased along with the increase of humidity, and on the basis of the increase of humidity, the distances between single fiber and nanoparticles on different fibers in the fabric layer can be regulated; further, a synergistic effect of localized surface plasmon resonance and electromagnetic coupling is triggered, and the transmission performance and the radiation performance of the textile in an infrared band are improved.

The invention relates to the field of semiconductor devices and neuromorphic calculation, in particular to a dual-structure memristor based on Ag nanoparticle modified MoS2 / HfO2 and a preparation method of the dual-structure memristor. The preparation process comprises the steps of sequentially depositing the Pt bottom electrode and the HfO2 resistive layer on the substrate, forming the Ag nanoparticle layer through thermal evaporation and annealing, then transferring the MoS2 thin film, and finally preparing the Au / Ag top electrode. The device can realize 19ns quick response and 283-order conductance state regulation and control in a vertical structure, and shows wide-spectrum light response capability in a planar structure by virtue of a local surface plasma resonance effect of Ag nanoparticles. The device has ultra-low power consumption, high switch ratio and multi-wavelength light sensing characteristics, can simulate various nerve synaptic behaviors and a light pulse learning function, is suitable for the fields of brain-like calculation, intelligent robots, multi-mode artificial intelligence systems and the like, and effectively realizes integrated fusion of sensing and calculation.

The present invention provides an optical fiber sensor with extremely high sensitivity and an optical fiber sensor device using the same. [Solution] The optical fiber sensor of the present invention comprises an optical fiber having an optical transmission section for transmitting incident light, and in the middle of the optical transmission section, there is an optical response section which includes a resonance film made of a metal film formed on the surface of the optical fiber and which generates surface plasmon resonance when excited by evanescent light, or a metal particle film containing metal nanoparticles which generate localized surface plasmon resonance when excited by evanescent light, and an auxiliary film containing graphene oxide provided to cover the resonance film, and whose response when it receives the incident light changes in accordance with changes in the surrounding conditions.

The invention provides a nonlinear optical response coupling structure and a preparation method and application thereof, the nonlinear optical response coupling structure comprises a substrate layer, and a reflecting layer, a single-layer MOS2 response layer and a plurality of gold nanorods which are sequentially arranged on the substrate layer, and the plurality of gold nanorods are disorderly distributed on the single-layer MOS2 response layer. In the nonlinear optical response coupling structure provided by the invention, a gold nanorod / MoS2 / reflecting layer / substrate layer composite structure is formed, and local surface plasmon resonance jointly excited by the gold nanorod and the silver film layer has an excellent second harmonic enhancement effect, and is simple in structure and convenient to operate.