7 results about "Plasmon coupling" patented technology

The application provides a method for exciting interband plasmons of double-layer graphene and a prepared device, and belongs to the technical field of optical devices, and comprises the following steps: sequentially laminating a third insulating layer, double-layer graphene and a second insulating layer to form a vertical heterojunction, transferring the vertical heterojunction to a substrate on which a first insulating layer is grown, obtaining a clean initial device substrate through heating separation and solvent cleaning, then preparing a nanoscale metal grating layer on the vertical heterojunction surface of the initial device substrate to form a device intermediate body, and preparing electrodes on the left and right sides of the device intermediate body, so that the electrodes are electrically connected with the double-layer graphene, an electrical regulation channel of the Fermi surface of the double-layer graphene is constructed, and a complete device for exciting interband plasmons is obtained. The nanoscale metal grating array can effectively excite interband plasmons of double-layer graphene, significantly improve the light-plasmon coupling efficiency and realize energy regulation of interband plasmons.

A photothermal converter based on a hemispherical Bi₂Se₃ superstructure belongs to the field of solar energy technology and applications. The stacked structure from bottom to top consists of: a metal substrate, a silica microsphere mask layer, and a Bi₂Se₃ thin film layer. The metal substrate is made of materials such as titanium and has a thickness greater than the skin depth (≥100 nm). The silica microsphere mask layer forms a close-packed array through self-assembly, with microspheres having a diameter of 200 nm. The Bi₂Se₃ thin film is prepared through conformal deposition, with a thickness ranging from several nanometers to hundreds of nanometers. This device utilizes the bulk-surface state synergistic effect of the topological insulator Bi₂Se₃, combined with Mie resonance excited by a hemispherical superstructure and plasmon coupling, to achieve an average high absorption rate of 97% in the 0.3–2.5 μm band and an emissivity as low as 0.07 in the 2.5–25 μm band. It exhibits stable absorption characteristics over a wide incident angle (0°–60°) and can be prepared in a low-cost and controllable manner through self-assembled microsphere masks and magnetron sputtering technology, providing a feasible solution for high-performance solar thermal conversion systems.

The invention provides a double-layer graphene inter-band plasmon excitation method and a prepared device, and belongs to the technical field of optical devices.The double-layer graphene inter-band plasmon excitation method comprises the steps that a third insulating layer, double-layer graphene and a second insulating layer are sequentially stacked to form a vertical heterojunction, then the vertical heterojunction is transferred to a substrate on which a first insulating layer grows, and a second insulating layer is formed; a clean initial device substrate is obtained through heating separation and solvent cleaning, then a nanoscale metal grating layer is prepared on the surface of a vertical heterojunction of the initial device substrate, a device intermediate is formed, electrodes are prepared on the left side and the right side of the device intermediate, the electrodes are electrically connected with the double-layer graphene, an electrical regulation and control path of a double-layer graphene Fermi surface is constructed, and the double-layer graphene Fermi surface is formed. And a complete device for exciting the inter-band plasmons is obtained. Through the nanoscale metal grating array, double-layer graphene inter-band plasmon can be effectively excited, the light-plasmon coupling efficiency is remarkably improved, and inter-band plasmon energy regulation and control are achieved.

Methods of forming magnetic / plasmonic hybrid structures are disclosed. The methods include synthesizing colloidal magnetic nanoparticles; modifying the magnetic nanoparticles in a solution of polymeric ligands; binding metal seed nanoparticles to the surface of the magnetic nanoparticles; and performing seed-mediated growth on the metal seed nanoparticles by reducing a metal salt in solution to form the magnetic / plasmonic hybrid structures.

An electro-optical modulator for an integrated photonic circuit, including: a substrate having a thin film of lithium niobate disposed on an electrically insulating material; first and second optical waveguides disposed on the thin film of lithium niobate, the optical waveguides being mutually spaced and composed of silicon nitride; and a pair of plasmonic electrodes disposed on the thin film of lithium niobate and configured to define a plasmonic waveguide in a nanoscale gap there between; wherein the plasmonic waveguide is configured to communicatively interconnect the optical waveguides by photon-plasmon coupling so that a modulation voltage applied across the pair of plasmonic electrodes modulates a phase of an optical signal passing from either of the optical waveguides to the other of the optical waveguides via the plasmonic waveguide.

The invention relates to the field of optical precision measurement and nano photonics, and discloses a single nanoparticle plasmon phase imaging system and a coupling effect measurement method. The system comprises a coherent light source module, a polarization state modulation module, a microscope objective module, a wavefront sensing module, an image acquisition module and a central processing module, two cross-polarization interferograms are obtained through polarization modulation, phases are reconstructed, differential phase diagrams are generated, common-mode noise is suppressed, and dipole phase signals of nanoparticles are highlighted. According to the method, wavelength scanning and nanoscale spacing regulation are further combined, and quantitative measurement of the plasmon coupling effect is achieved. According to the invention, the signal-to-noise ratio and the positioning precision are improved, and optical property characterization and near-field coupling mechanism research under a single particle scale are supported.

The application provides a plasmon coupling surface interface in-situ spectrum and imaging test system, which records reflected light intensity or spectrum while changing laser incidence angle, and when the incidence angle of the laser is just in the range of the optical near field and excites surface plasmon polariton of a silver film in a prism coupling manner, the minimum point of the reflected light intensity is observed, that is, surface plasmon resonance, the incidence light is kept to excite the sample at the resonance angle, and at this time, the target molecule system on the surface of the silver film scatters and absorbs the electromagnetic surface wave bound in the near field range, and re-emits the light signal to the far field. The system realizes in-situ combination of surface plasmon resonance, surface enhanced Raman scattering spectrum, total internal reflection fluorescence spectrum and imaging technology by collecting the light signals.