141 results about "Fano resonance" patented technology

The invention provides a kind of multilayer symmetrical metamaterial capable of generating a Fano resonance enhancing phenomenon and a frequency tunable phenomenon. Through the fact that rectangular crystal lattice arrangement is used in a resonance cell array of the multilayer symmetrical metamaterial (namely, on the surface of the metamaterial, the cycle length of a resonance cell in the horizontal direction is not equal to the cycle length of the resonance cell in the perpendicular direction), electric dipole resonance of the multilayer symmetrical metamaterial is enhanced, the electric dipole resonance interacts with strong magnetic dipole resonance of the metamaterial, the Fano resonance phenomenon in the transmission spectrum of the metamaterial is enhanced, a steep asymmetrical harmonic peak is achieved, and therefore the technical problem that shift and intervals of resonant wave length must be far larger than the resonant cavity bandwidth is solved, and wavelength resolution of the multilayer symmetrical metamaterial and sensitivity of exploration conducted on refractive index change of living beings by the multilayer symmetrical metamaterial are improved. The Fano resonance quality factor of the structure increases along with the increase of the cycle length of the resonance cell in the horizontal direction or along with the increase of the cycle length of the resonance cell in the perpendicular direction. Meanwhile, the Fano resonance wavelength of the structure reduces along with the increase of the cycle length of the resonance cell in the horizontal direction or along with the increasing of the cycle length of the resonance cell in the perpendicular direction (blue shift), and therefore tuning of the Fano resonance can be achieved.

The invention discloses a nano-meta-material full-color-gamut palette and a preparation method thereof. Electron beam photo-etching and reactive ion etching technologies are adopted; a transverse undercutting effect is utilized for obtaining a sub-wavelength periodic-structure array, which suspends above a dielectric layer, on a substrate; a metal film is deposited in the direction perpendicular to the substrate; and forming a metal nanostructured array-metal complementation nanostructured array film coupled structure. The sub-wavelength meta-material shows a mixed surface plasma resonance mode in a visible light spectrum and generates specific optical responses such as multiple resonance peaks, FANO resonance, angle-dependent spectrum adjustability and hundreds of thousands of times field enhancement, so that continuous and adjustable colors can be obtained in a structural unit. The nano-meta-material palette can generate full-color-gamut colors in a CIE chromaticity diagram, and the color pixel can be reduced to one hundred to hundreds of nanometers. The technology provided by the invention has an important application prospect in the fields such as product production, high-definition displaying, artistic creation, orientation sensing, photon codes and information storage.

The invention provides a multilayer symmetric metamaterial based on a phase-change material or a topological insulating material. A resonant unit array of the multilayer symmetric metamateiral is arranged in a rectangular lattice form (namely, on the surface of the metamaterial, the horizontal cycle length Lx and the vertical cycle length Ly of a resonant unit are not equal), so that steep asymmetric Fano harmonic peaks exist in the transmission spectrum of the multilayer symmetric metamaterial; and then, the phase-change material or the topological insulating material is introduced into the multilayer symmetric metamaterial, and the Fano resonant frequency is tunable, so that the technical problem that the Fano resonant frequency cannot be changed after determination of the metamaterial structure is solved. The characteristic that the dielectric coefficient of the phase-change material or the topological insulating material changes along with the change of an extra electric field or the temperature is used in the invention, so that the tunability function of the Fano resonant frequency in the multilayer symmetric metamaterial is realized, and the maximum adjusting amplitude can be up to 40 percent.

The invention provides a multilayer asymmetrical metamaterial capable of realizing Fano resonance enhancement. By moving resonant cells of the multilayer metamaterial away from the center positions of the resonant cells, the resonance of the electric dipoles of the resonant cells is enhanced and interacts with the resonance of the strong magnetic dipole of the metamaterial, a single Fano resonance peak in the transmission spectrum of the metamaterial is split into two asymmetrical resonance peaks and the dispersion characteristic of one resonance peak is steeper, so that the Fano resonance enhancement is realized, the technical problem that the deviation and the interval of resonance wavelength must be far more than that of resonant cavity bandwidth is solved, and the wavelength resolution of the metamaterial and the sensitivity of the metamaterial to the detection of biological sample refractive index change are improved. At the same time, by adopting the structure, the quality factor of the Fano resonance is increased with the distance of deviation of the resonant units from the center positions of the resonant units.

The invention discloses an all-optical switch based on a sulfur phase-change material and a preparation method thereof, and belongs to the field of optical communication. The all-optical switch comprises a coverage layer film, a sulfur phase-change material film, an isolation layer film, a silicon photonic crystal and a substrate which are sequentially stacked. The silicon photonic crystal comprises a nanometer porous structure, and the silicon photonic crystal has the fano resonance effect. When the all-optical switch is in use, the state of the sulfur phase-change material film is controlledthrough laser, the resonance state of the silicon photonic crystal is regulated, the signal light transmissivity is modulated, the modulation range is the communication wave band being 1,500 nanometers to 1,600 nanometers, and the optical switch is obtained. The all-optical switch has the advantages of being high in contrast ratio and speed and low in power consumption. The structure is simple, the production cost can be lowered, and the switch is suitable for CMOS integrated, capable of being easily matched with a modern semiconductor technology production line, and applicable to industrialproduction and productization.

The invention discloses a multiple nano-rod dimer array structure, a manufacture method thereof, a method for exciting the Fano resonance of the multiple nano-rod dimer array structure, and an optical sensor comprising the multiple nano-rod dimer array structure. In the structure, appropriate refractive index, transverse gaps, longitudinal gaps and lengths are selected, such that the structure has good Fano resonance characteristics. Under the vertical effect of incident light with an electric field polarization direction parallel to a nano-rod long axis direction, the Fano resonance of the structure is strongly excited. With the structure, the sensitivity of the optical sensor can be greatly improved. Therefore, the invention has important influence on the improvement of the performance of optical sensors.

The invention discloses a micro-nano optical switch based on surface plasmon fano resonance. The micro-nano optical switch based on the surface plasmon fano resonance comprises a transparent substrate and is characterized in that a metal film layer, a nematic phase liquid crystal orientation conversion layer and a polarizer are superposed on the transparent substrate in sequence. The polarizer gives an initial direction of polarization to transmitting light, and the nematic phase liquid crystal orientation conversion layer is used for receiving the transmitting light having the initial direction of polarization and controlling a direction of polarization of the light transmitted through the nematic phase liquid crystal orientation conversion layer. A separate metal hole tetramer unit configuration or an array topological configuration formed by performing square arrangement or hexagonal arrangement on metal hole tetramer units is etched on the metal film layer, and four holes in the metal hole tetramer unit configuration are symmetrical in a D2h cluster mode and have orthogonal short axes and long axes. When the direction of polarization of the light transmitted through the nematic phase liquid crystal orientation conversion layer is parallel to the short axes, an optical path is opened, otherwise, the surface plasmon fano resonance is excited, and the optical path is closed. The micro-nano optical switch based on the surface plasmon fano resonance has all the advantages of liquid crystal optical switches and a wavelength selection function, while the traditional liquid crystal optical switches do not have the wavelength selection function.

The invention belongs to the technical field of micro-nano photoelectric device electromagnetic wave regulation and sensing detection, and particularly relates to a far-infrared domain polarization-insensitive all-dielectric super-surface structure and a manufacturing method thereof. The super-surface comprises a substrate and a concentric double-closed dielectric resonance loop unit located on the surface of the substrate and distributed in the two-dimensional periodicity; used base materials of the substrate and concentric double-closed dielectric resonance loop unit are all-dielectric materials. The super-surface is insensitive to the polarization of excitation electromagnetic waves due to the high symmetry of the structure; the Fano resonance line font with high modulation depth and high Q values in a far-infrared domain can be obtained through the modulation of geometric parameters; because the preferred base materials for constructing the super-surface are all-dielectric Si and SiO2 materials, the process is mature, simple and easy to operate, and the manufacturing cost is low.

The invention provides a micro-nano optical detection device and a micro-nano optical detection system and relates to the technical field of optical detection. The micro-nano optical detection device comprises a first cover plate, a second cover plate and a conduction assembly, wherein the conduction assembly is arranged between the first cover plate and the second cover plate; the first cover plate and the second cover plate are used for preventing electromagnetic waves conducted through the conduction assembly from being leaked; the conduction assembly comprises a first waveguide, a second waveguide and a resonant cavity; the first waveguide and the second waveguide are arranged at two opposite sides of the resonant cavity; the first waveguide, the resonant cavity and the second waveguide are used for conducting light with specific wavelengths. According to the micro-nano optical detection device provided by the embodiment of the invention, the light is coupled into the resonant cavity to generate Fano resonance or Lorentz resonance; light to be detected at a specific waveband is transmitted in a manner of coupling the light from one end of the first waveguide to one end of the second waveguide through the resonant cavity; whether the light with the specific wavelengths passes through the micro-nano optical detection device or not can be detected, so that a transmission condition of the specific wavelengths is detected.

The invention discloses a temperature sensor based on Fano resonance. The temperature sensor based on Fano resonance comprises a substrate layer and a metal layer which are sequentially overlapped from bottom to top, wherein a first resonant cavity and a second resonant cavity which do not communicate with each other are arranged in the metal layer; the first resonant cavity is a cavity which is formed by integrating a rectangular cavity and a cavity in a semicircular shape; the cavity in the semicircular shape is positioned at the middle portion of the rectangular cavity; the second resonant cavity is a resonant cavity in a T-shaped shape; and the first resonant cavity and the second resonant cavity are filled with temperature sensing media. The surface plasma sensor has the advantages of the small volume, the quick response, the simple preparation process and the low cost, and can improve the sensitivity and the Q value and can reduce the full width at half maximum of a Fano resonance spectral line, thereby achieving the nano-scale sensing in the field of biological and medical detection.