12 results about "Surface plasmon wave" patented technology

This invention provides an adjustable notch filter based on a ridge waveguide SSPP structure, relating to the field of wireless communication technology. By introducing independent planar adjustable notch units into the ridge waveguide SSPP structure, the notch frequency can be continuously adjusted without compromising the surface wave propagation characteristics and frequency-selective transmission response of the SSPP. The SSPP structure is formed by periodically etching multiple grooves along the propagation direction on a metal ridge, with continuous portions of the metal ridge maintained between adjacent grooves. These periodic grooves modulate the dispersion characteristics of the electromagnetic field within the ridge waveguide, enabling the ridge waveguide to support equivalent surface plasmon wave propagation, thereby forming a stable frequency-selective transmission response within a predetermined frequency range. The planar adjustable notch unit constructs a main transmission path and a secondary transmission path, utilizing the destructive interference of the two paths at a specific frequency to create a notch effect. Simultaneously, by changing the equivalent capacitance value of the varactor diode, the notch frequency can be continuously adjusted within the predetermined frequency range.

The present invention discloses a broadband and efficient coupling device for terahertz spoof surface plasmons, a preparation method thereof and an application thereof, belonging to the technical field of terahertz on-chip passive devices. It is successively connected from left to right by a standard rectangular waveguide I, a converter II, a spoof surface plasmon waveguide III, a converter II and a standard rectangular waveguide I. The present invention realizes wave vector matching, polarization matching and impedance matching before and after mode conversion with a parameterized three-dimensional metal surface. Through structural parameter design and optimization, broadband and efficient conversion from the TE mode of the standard rectangular waveguide to the spoof surface plasmon mode is achieved. The present invention uses the geometric characteristics of the structure to disassemble the overall device for processing compatibility, separately prints the disassembled device structures through a high-precision 3D printing process, combines with a magnetron sputtering method to metallize the device surface, and finally completes the overall assembly of the device using the reserved holes. This device has the advantages of high confinement, low loss, and tunability, etc.

The utility model discloses a biosensor with a large detection range, which comprises an optical fiber body, a sensing area is formed on the optical fiber body, and a gold film layer and an indium gallium arsenic and gold nanoparticle film layer are respectively attached to the surface of the sensing area from inside to outside. According to the technical scheme, the surface electric field intensity of the gold film is improved by utilizing high carrier mobility and high light absorptivity of indium gallium arsenic, the sensitivity of the sensor is further improved, and an enhanced local electric field is generated between the indium gallium arsenic film and the gold nanoparticles by utilizing mutual coupling of surface plasmon polaritons of indium gallium arsenic and local plasmon polaritons generated by the gold nanoparticles, so that the sensitivity of the sensor is improved. The sensor structure provided by the technical scheme has relatively high sensing sensitivity and chemical stability, real-time monitoring can be realized, and the detection range of the biosensor is further expanded.

The invention discloses a terahertz three-dimensional link interconnection-oriented bistable adjustable pseudo surface plasmon waveguide and a preparation method thereof, and belongs to the technical field of terahertz on-chip communication, the waveguide comprises a feed structure, an actuator, a patterned metal patch, a flexible dielectric substrate and a fiber-reinforced active layer, wherein the fiber-reinforced active layer is provided with a positive thermal response area and a negative thermal response area, S-shaped bending can be generated under photo-thermal excitation, and dynamic switchable interconnection between chips with different heights in a three-dimensional space is achieved. The working frequency band of the waveguide is 31.56-127.71 GHz, the relative bandwidth reaches 120%, the insertion loss is lower than 1.5 dB, and the waveguide has the characteristics of low loss, ultra wide band and bistable holding. The preparation method comprises the steps of waveguide main body structure processing, fiber reinforced active layer compounding, actuator integration and overall assembly. The method solves the problems that the existing terahertz interconnection dimension is limited and the resource allocation is fixed, and is suitable for a high-density three-dimensional integrated and dynamic reconfigurable system on chip.

The utility model discloses a biosensor and a sensing system with a high-density loading function, which comprise an optical fiber body, a sensing area is formed on the optical fiber body, and a gold film layer, a titanium boride and gold nanoparticle film layer are respectively attached to the surface of the sensing area from inside to outside. According to the utility model, through the design of the gold film-titanium boride film-gold nanoparticle composite structure, the surface electric field intensity of the gold film is improved by utilizing the high carrier mobility and high light absorptivity of titanium boride, so that the sensitivity of the sensor is improved; by utilizing mutual coupling of titanium boride surface plasmon polaritons and local plasmon polaritons generated by the gold nanoparticles, an enhanced local electric field is generated between a titanium boride film and the gold nanoparticles, so that the interaction between surface plasmon waves and a to-be-detected substance is enhanced, the detection sensitivity is improved, the gold nanoparticles provide high-density probe load, and the detection sensitivity is improved. According to the utility model, the composite structure improves the detection range and the application scene through dielectric-plasma cooperative response.

A kind of micro-ring electro-optic modulator based on surface plasmon and preparation method thereof, comprising: silicon oxide layer and lithium niobate layer, wherein: the upper surface of lithium niobate layer is provided with under-coupled silicon race track micro-ring and straight waveguide constituting resonance ring, the two ends of straight waveguide are input end and output end respectively, lithium niobate layer is provided with lithium niobate sharp cone mode conversion structure for converting optical wave into surface plasmon wave, lithium niobate ridge waveguide and a pair of gold electrode, vertical coupling structure for light to propagate upwards or downwards is arranged between lithium niobate layer and silicon layer.The present application utilizes silicon micro-ring with surface plasmon waveguide, enhances the local action on optical field, significantly improves the modulation efficiency of modulator, realizes large bandwidth.At the same time, over-coupled micro-ring is designed, only specific wavelength light is coupled into micro-ring, high-speed modulation is carried out, and the great transmission loss caused by only surface plasmon transmission is reduced.

The invention relates to a terahertz dynamic surface plasmon wavefront regulation and control device, and provides a new device for realizing terahertz surface plasmon wavefront dynamic regulation and control on a GST metasurface. According to the terahertz surface plasmon dynamic wavefront regulation and control device based on the GST, a silicon substrate is arranged at the bottom, and a lossy metal aluminum film with a sub-wavelength rectangular slit resonator array is arranged on the silicon substrate; two columns of slit resonator arrays which are perpendicular to each other and distributed along the y axis form an active group or a passive group, the difference between the active group and the passive group is that a germanium antimony tellurium GST thin film strip is deposited on the surface of a metal aluminum film of the active group, the surface of the passive group is not deposited, and the active group and the passive group are arranged adjacently; switching of different functions of the surface plasmon is realized by using the rotation angle of the sub-wavelength slit resonators, the relative distance between the sub-wavelength slit resonators and the GST phase change characteristic. The surface plasmon wavefront regulation and control device is mainly applied to design and manufacturing occasions of the surface plasmon wavefront regulation and control device.

The present invention provides a surface plasmon optical fiber with high thermal radiation performance, comprising an optical fiber core and a cladding. A metal layer arranged in a porous array is provided outside the optical fiber cladding. A thermal emissivity layer is provided on the side of the metal layer away from the optical fiber core, and a cooling layer is provided on the side of the thermal emissivity layer away from the optical fiber core. The optical fiber of the present invention utilizes the metal layer arranged in a porous array so that the cladding light excites surface plasmons at the interface between the metal layer and the cladding; the heat carried by the surface plasmon wave is transmitted through the thermal emissivity layer mainly by thermal radiation, in combination with heat conduction and heat convection. The optical fiber of the present invention can dissipate the heat generated by the cladding light while filtering out the cladding light, effectively improving the beam quality of the output laser and solving the problem of excessively high local temperature of the optical fiber.

This application proposes a kanamycin U-shaped fiber optic sensor, its fabrication method, and a fiber optic sensing system, belonging to the field of sensor detection technology. The sensor includes: a fiber core, a cladding, a silver film, a polydopamine layer, silver nanoparticles, a kanamycin aptamer, and mercaptohexanol. The silver film serves as a metal-sensitive layer, used to achieve wave vector matching between free electrons on the surface of the silver film and evanescent waves to excite plasmon resonance on the surface of the silver film. The polydopamine layer is used to immobilize the silver nanoparticles. The silver nanoparticles are used to excite the LSPR effect and to modify the surface of the kanamycin aptamer. Mercaptohexanol is used to fill non-specific binding sites. The kanamycin aptamer binds to kanamycin to change the refractive index of the fiber surface, thereby altering the resonance conditions between the evanescent wave and the surface plasmon wave, causing a redshift of the resonance wavelength. The sensor of this application shortens the response time of the kanamycin U-shaped fiber optic sensor, is simple to fabricate, and is small in size and lightweight.

The invention discloses a high-power terahertz photoconductive emission device and a preparation method thereof, and relates to the technical field of terahertz devices. Comprising a sapphire substrate, a Si-GaN layer, a coplanar strip line waveguide structure layer and a SiO2 passivation layer, the Si-GaN layer is integrated on the sapphire substrate, and the coplanar strip line waveguide structure layer is prepared on the Si-GaN layer; the coplanar strip line waveguide structure layer comprises an electrode structure layer composed of a signal electrode and a grounding electrode, and a photoconductive gap between the signal electrode and the grounding electrode adopts a surface plasmon waveguide matching design; the SiO2 passivation layer is located at the photoconductive gap; and the Si-GaN layer is made of a Fe doped Si-GaN material. The problems that a traditional LT-GaAs-based device is low in power and insufficient in efficiency are solved.

The present application relates to a terahertz dynamic surface plasmon wavefront modulation device, and provides a new device for realizing terahertz surface plasmon wavefront dynamic modulation by using a GST metasurface.The present application is a terahertz surface plasmon dynamic wavefront modulation device based on GST, which comprises a silicon substrate and a lossy metal aluminum film with a subwavelength rectangular slit resonator array on the silicon substrate; the device comprises two columns of slit resonator arrays which are perpendicular to each other along the y-axis and form an active group or a passive group; the active group and the passive group differ in that the surface of the metal aluminum film of the active group is deposited with a germanium antimony tellurium (GST) film strip, while the surface of the passive group is not deposited; the active group and the passive group are arranged adjacently; by using the rotation angle of the subwavelength slit resonator, the relative distance between the subwavelength slit resonators and the GST phase transition characteristics, the switching of different functions of the surface plasmon can be realized.The present application is mainly applied to the design and manufacture of surface plasmon wavefront modulation devices.

An integrated infrared spectroscopy chip for enhanced detection based on tunable surface plasmons consists, from top to bottom, of a source and drain, a graphene / boron nitride heterojunction, a nanogap layer, a dielectric metasurface, a dielectric layer, an infrared detector, and a substrate. A nanogap layer exists between the dielectric metasurface and the graphene / boron nitride heterojunction. The dielectric metasurface serves as the gate. The source and drain are evaporated on the surface of the graphene / boron nitride heterojunction, forming a tunable surface plasmon waveguide resonator. The infrared detector is vertically integrated with the tunable surface plasmon waveguide resonator via the dielectric layer for infrared spectral signal detection. Under infrared light irradiation, low-loss surface plasmon modes are excited. The resonant peak is manipulated by an external electric field to achieve wide-band wavelength scanning. Infrared spectral signals are sequentially acquired in a time series. Through processing, the infrared spectral absorption signals of molecules are obtained, ultimately realizing an integrated infrared spectroscopy chip for both spectral enhancement and spectral detection. The present invention offers advantages such as high sensitivity, wide range of detectable substances, compact size, and high integration.