89 results about "Plasmon waveguide" patented technology

A planar integrated circuit includes a semiconductor substrate having a substrate surface and a trench in the substrate, a waveguide medium in the trench having a top surface and a light propagation axis, the trench having a sufficient depth for the waveguide medium to be at or below said substrate surface, and at least one Schottky barrier electrode formed on the top surface of said waveguide medium and defining a Schottky barrier detector consisting of the electrode and the portion of the waveguide medium underlying the Schottky barrier electrode, at least the underlying portion of the waveguide medium being a semiconductor and defining an electrode-semiconductor interface parallel to the light propagation axis so that light of a predetermined wavelength from said waveguide medium propagates along the interface as a plasmon-polariton wave.

An optical device for integrated photonic applications includes a substrate, a dielectric waveguide and a surface plasmon waveguide. The dielectric waveguide includes a dielectric waveguide core disposed relative to a dielectric waveguide cladding and a common cladding. The surface plasmon waveguide includes a surface plasmon waveguide core disposed relative to the common cladding and a surface plasmon waveguide cladding. The common cladding couples the dielectric waveguide and the surface plasmon waveguide.

Methods for measuring a property of a sample material present at an interface of an emerging medium in a spectroscopic device include a sensor (10) featuring at least one dielectric member (14) disposed upon a entrant medium (12), with the dielectric member being of an optical thickness selected to produce an observable interference effect for an incident angle of light below the critical angle of total internal reflection at the interface with the dielectric member (14). The dielectric member (14) of the sensor device (10) may be modified and functionalized for binding of a sample analyte by disposing a sensing surface area (38, 40, 42) upon it. Moreover, an metal layer (18) may be added to an entrant medium (20) to produce a sensor (16) that generates observable optical phenomena both above (resonance) and below (interference) a given critical angle.

The invention discloses a microwave vortex wave generator based on artificial surface plasmon. The microwave vortex wave generator works in a microwave frequency band, double layers of artificial surface plasmon waveguides achieve transmission of electromagnetic waves, and the waveguides on the upper layer are connected to the waveguides on the lower layer through a metal through hole. The radiation part of the microwave vortex wave generator is mainly achieved through a series of circular patches which are placed beside the artificial surface plasmon waveguides, and meanwhile the circular patches also provide phases needed for generating different vortex waves as resonators. The microwave vortex wave generator can have different vortex waves with different orbit angular momentum modes at different frequency positions without making any changes in structure.

The embodiment of the invention provides a plasmon waveguide, a biosensor chip and a system. Specifically, the plasmon waveguide is applied in the biosensor chip, and comprises a substrate and a plasmon structure disposed on the upper surface of the substrate, the plasmon structure includes a plurality of plasmons in periodic arrangement, the plasmons are metal split rings, and the annular openings of the plasmons are used for fixation of antibody probes. According to the embodiment of the invention, the plasmon waveguide is disposed in the biosensor chip, and the antibody probes can be used for capture of target biomolecules in detection liquid flowing into a microfluidic channel, and the plasmon waveguide is employed to enhance the signal strength of THz wave emitted to the biosensor chip, thus enhancing the signal strength of reflection THz wave detected by a terahertz analyzer, and improving the detection sensitivity, signal-to-noise ratio and reliability.

The present invention provides a suspended graphene propagation plasmon waveguide device. The suspended graphene propagation plasmon waveguide device comprises a substrate, a graphene layer and an electrode which are disposed sequentially from bottom to top; the substrate comprises at least one hole structure and is used for supporting a graphene layer and an electrode; the graphene layer covers the hole structure of the substrate, so that a suspended graphene structure can be formed; and the electrode is used for electrical measurement and electrostatic regulation of graphene carrier concentration and is arranged on the graphene layer. According to the structure of the suspended graphene propagation plasmon waveguide device of the invention, propagation plasmons are supported on the suspended graphene structure; with such kind of structure adopted, the dielectric loss of the graphene plasmons can be effectively eliminated, and the decay rate of the plasmons can be reduced; and since the dielectric constant of the air is small, the wavelength of the plasmons on the suspended graphene is very long, and a long-wavelength propagation distance can be achieved with the low attenuation characteristic of the plasmons utilized.

The invention discloses an ultra wide band terahertz class surface plasmon coupler and a coupling method. In the invention, a TEM mode compressor, a mode matcher and a surface mode radiator are adopted. Parameters of the above three portions are reasonably selected. Conversion efficiency from a TEM mode to a class surface plasmon mode is greatly increased and simultaneously an excitation band width of the class surface plasmon mode is widened. The coupler and the coupling method play a powerful role in promoting practical application of a class surface plasmon waveguide which is a novel waveguide in a terahertz wave band. The coupler of the invention is a whole metal structure so that electromagnetic energy losses introduced by the coupler are reduced. Simultaneously, processing of the coupler is convenient and integration is easy to achieve.

The invention discloses a 90-degree optical mixer based on a hybrid plasmon waveguide structure. The 90-degree optical mixer is composed of a single 4*4 multimode interference coupler (MMI). The hybrid plasmon waveguide structure consists of a dielectric waveguide layer, a slit dielectric interlayer on the dielectric waveguide layer, and a metal layer on the slit dielectric interlayer. When lightenters the hybrid plasmon waveguide, the special structure of the hybrid plasmon waveguide can excite a hybrid plasmon mode and confines the mode in the slit dielectric interlayer so that the propagation distance under the same optical path can be greatly reduced and thus the size of the device is greatly reduced. Thus, compared with a conventional dielectric waveguide mixer, the 90-degree opticalmixer is reduced in size from millimeters to micrometers, provides a new structural solution for highly integrated photonic devices and has far-reaching effects on the further integration of photonicdevices.

A structure of a low frequency surface plasmon polariton waveguide includes multiple unit cell blocks arranged at a sub-wavelength period to line up in a one-dimensional line-up direction to form a hollow metallic block periodic structure. Each unit cell blocs includes a body, a penetration section, and an open slot. The penetration section is formed in the unit cell block by extending in a direction perpendicular to the one-dimensional line-up direction so as to define a channel space in the unit cell block. In a low frequency spoof surface plasmon polariton transmission mode, in case of serving as a structure of an antenna, each unit cell block has an electromagnetic field distribution mostly confined in a channel space of the unit cell block; and in case of serving as a waveguide, the electromagnetic field is mostly distributed between two adjacent unit cell blocks with minority distributed in the channel space.

The invention discloses a photo-thermal effect simulation method for a surface plasmon waveguide. The method comprises the following steps: firstly, determining an edge value problem of a light fieldpart based on an electric field vector wave equation and an electromagnetic boundary condition, discretizing a light field analysis area by adopting tetrahedral vector edge elements, establishing a light field finite element matrix equation according to a Galerkin method, and solving to obtain electric field distribution of a three-dimensional surface plasmon waveguide; then, heat generated by anelectric field is used as a heat source; determining an edge value problem of a thermal field part based on a transient heat conduction equation and a thermal boundary condition; a tetrahedral scalarnode element is adopted to discretize a thermal field analysis area, an unconditionally stable backward difference format is adopted to discretize a time domain, a thermal field finite element matrixequation of each time step is established according to a Galerkin method, and transient temperature distribution of the three-dimensional surface plasmon waveguide is obtained through solving. The method has the advantages of being high in simulation precision, wide in application range and high in solving efficiency.

The invention provides a branchy tree-shaped plasmon waveguide composite nano-structure synthesis method and an optical manipulation method thereof. The branchy tree-shaped plasmon waveguide compositenano-structure synthesis method includes a plurality of steps, and each step can be accurately controlled. Thickness of a trunk of a tree-shaped nano-structure and thickness of a branch-shaped nano-structure growing on the trunk can be accurately controlled. quantum dots with / without housings are overlaid on the surface of the tree-shaped nano-structure to form a quantum dot composite tree-shapednano-structure, and the quantum dots without housings can be applied to chemocatalysis, environment monitoring, biosensing and other fields. When incidence of light occurs from one end of a nano wire, through the nano wire and the branch-shaped structure, the quantum dots with housings are excited to emit light, so that the branchy tree-shaped plasmon waveguide composite nano-structure synthesismethod and the optical manipulation method thereof can be applied to remote sensing Raman, novel lasers and other fields. Besides, through optical manipulation, the intensity and the polarization of the incident light can be changed, and then the quantum dots in a specific region can be controlled to emit light, so that the crosstalk effect, between scattering centers, interfering generation of diffraction effect, can be eliminated. Therefore, the branchy tree-shaped plasmon waveguide composite nano-structure synthesis method and the optical manipulation method thereof can be used for high resolution detection of sub-wavelength.

The invention discloses an ultra-wideband artificial surface Plasmon low-pass filter which is mainly formed by a dielectric substrate layer and metallic foil layers printed on the both side surfaces of the dielectric substrate layer. Waveguide structures are engraved on the metallic foil layers. Each waveguide structure is formed by a middle surface Plasmon waveguide portion, symmetric microstrip line portions at both ends, and two transition portions. The ultra-wideband artificial surface Plasmon low-pass filter may achieve effective transmission of artificial surface Plasmon waveguide, and has symmetric structure, easy processing, compact size, a ultra-wide band and high filtering performance, and is especially suitable for being used in cooperation with a conventional microwave or terahertz transmission line.