38 results about "Local field enhancement" patented technology

The invention provides a precise laser polishing device and a method thereof. According to the method, a glass pane coated with micro-nano particles is attached to the surface of a work-piece to be polished, the micro-nano particles are located between the glass pane and the work-piece to be polished, a pulsed laser device emits pulse lasers, focused pulse light beams radiate the glass pane coated with the micro-nano particles, the micro-nano particles serve as a focusing lens, energy around the micro-nano particles is enhanced after the lasers are focused by the micro-nano particles, the surface of the work-piece to be polished protrudes or the tip part of the work-piece to be polished gets fused, and therefore the polishing effect is realized. According to the precise laser polishing device and the method thereof, the pulse lasers converge and act on the surface of material through the micro-nano particles, and the laser polishing technology within the micro-nano scale range is realized through the local field enhancement effect of the micro-nano particles. The polishing device is convenient to construct, simple and practicable; for work-pieces with complex shapes and appearances to be polished, the polishing effect is still good through the method.

The invention provides a method and a device for coaxial combined machining with tubular electrode discharging and laser irradiation, and belongs to the field of non-traditional machining and combined machining. Micro-etching machining is performed on the surface of an insulating high-hardness brittle material by virtue of a coaxial action of cone-shaped tube electrode discharging and laser irradiation, recessive material defects and stress concentration generated by pulsed laser acting on the surface of a workpiece can attract spark discharge to always act on the current area, and meanwhile, the spark discharge changes the surface shape and physico-chemical property of the current area, then nonlinear absorption of the current area on laser energy is improved, a local field enhancement effect is generated, and pulsed laser focused irradiation can accelerate an electrochemical reaction to promote generation of a stable discharge gas film layer on the surface of a hollow tool electrode; and the interactive cooperation of two types of energy achieves fixed-area micro-etching of the insulating high-hardness brittle material, the machining efficiency is significantly improved, and the machining quality is improved.

The invention discloses Er<3+> / Ce<3+> / Yb<3+> tri-doped tellurate glass containing silver nano particles and a preparation method thereof. The glass consists of the following components in percentage by mole: 65-75mol% of TeO2, 5-10mol% of Bi2O3, 10-20mol% of ZnO, 5-10mol% of Na2O, 0.1-1.0mol% of Er2O3, 0.1-1.0mol% of Ce2O3, 0.4-2.0mol% of Yb2O3 and 0.1-1.0mol% of AgNO3. The tellurate glass has the following advantages that by adopting tellurium oxide as a main component and adding bismuth oxide, zinc oxide and sodium oxide, the forming ability and physical-chemical stability of the glass are improved; due to the tri-doping way of rare earth Er<3+>, Ce<3+> and Yb<3+> ions, the sensitization among the rare earth ions is sufficiently utilized to improve the luminous efficiency of the rare earth Er<3+> ions under a commercial 980nm-wavelength semiconductor laser diode pump; and the fluorescence emission intensity of the doping Er<3+> ions in the 1.55mu m near infrared waveband is enhanced by the local field enhancement effect of the silver nano particles.

The invention provides a nano-silver modified rare earth-doped luminescent material for frequency conversion and a preparation method thereof, which is composed of glass containing rare earth ions and a vitreous film containing nano-silver particles, and the vitreous film containing nano-silver particles is uniformly coated on on glass surfaces containing rare earth ions. First prepare the glass containing rare earth ions, then prepare the vitreous film containing nano-silver particles, and then coat the vitreous film containing nano-silver particles on the surface of the glass containing rare earth ions by rotating speed spin coating or dipping and pulling , to obtain nano-silver modified rare-earth-doped luminescent material for frequency conversion. The obtained composite luminescent material has good optical properties and thermal stability. The present invention realizes high frequency conversion luminous efficiency by utilizing the local field enhancement effect of nano-silver particles through excitation light irradiation, and its luminous efficiency can be enhanced up to 15 times. The problem of low luminous efficiency of the frequency conversion glass material is effectively made up for.

The invention discloses a medium nanometer light wave antenna sensor based on a rod-ring structure; a material mainly containing silicon dioxide is used as a substrate; a silicon layer of the rod-ringstructure arranged in a periodic array mode is arranged on the substrate, and for incident light with the wavelength ranging from 600 nanometers to 2500 nanometers, peaks can be obtained in transmission / reflection spectral lines. By utilizing the polaron resonance characteristics that the medium material can be polarized under irradiation of incident light and generate an internal displacement current, the change of an environment refractive index can be indirectly detected, and then water pollutants can be detected. Due to a low-loss characteristic, damage to sensing marker molecules due toa strong light heat effect can be avoided while large local field enhancement is obtained, and composition and concentration of to-be-detected protein molecules can be reversely deduced according to resonance wavelength obtained through detection through early calibration and later comparison.