34 results about "Near-field optics" patented technology

The invention provides a high precision nanometer clearance detection structure and method on the basis of surface plasma resonance, and belongs to the technical field of nanooptics. The high precision nanometer clearance detection structure and method on the basis of the surface plasma resonance can solve the problems that measuring precision is low and dynamic measurement cannot be carried out in the prior art. Light output by a light source enters a beam splitter through a collimating mirror and a broadband polarizer; the transmission light passing through the beam splitter interacts with the nanometer clearance detection structure and a substrate and then is reflected to the beam splitter; the light enters a spectrum detector after being reflected by the beam splitter and converged by a lens, the detector transmits obtained data through detection to a computer, clearance values are obtained through the processing of the computer, and the detection of the nanometer clearance is achieved. According to the high precision nanometer clearance detection structure and method on the basis of the surface plasma resonance, the method of spectrum detection is adopted to achieve high precision dynamic detection of a nanometer level clearance, a brand new testing technology is provided for the field of nanometer machining and nanometer measuring, and hopefully, the high precision nanometer clearance detection structure and method on the basis of the surface plasma resonance can play an important role in multiple fields including near-field optics and near-field physics.

The invention discloses a one-dimensional metallic photonic crystal plano-concave mirror for cylindrical symmetrical vectorial light beam focusing, and relates to the field of light field regulation in sub-wavelength photonics. The plano-concave mirror is composed of a one-dimensional metallic photonic crystal with metallic layers and dielectric layers arranged periodically and alternatively, and along the periodic photonic direction of the photonic crystal, one side is a plane while the other side is a hemispherical concave surface. By making full use of negative refraction properties and simultaneous orthogonal polarized light regulation capacity of the photonic crystal, the structure can effectively focus radial and spiral polarized light, and sizes of focused light spots reach sub-wavelength magnitude. In other words, by the structure, sub-wavelength focusing of cylindrical symmetrical vectorial light beams of any polarization component can be realized. By changes on constituent materials and structural parameters, focusing effect can be realized within broadband. The plano-concave mirror is simple in constituent material, easy for designing parameters and structurally easy to produce, and has good application prospects in the fields of near-field optics, quantum optics and the like.

The invention provides a surface plasma longitudinal field scanning near-field optic microscope device and a detection method. The device is provided with a surface plasma excitation unit (1). After being focused through a high numerical aperture objective lens (6), incident light excites an SPP field on an interface of a metal membrane and air, raman signals and the SPP field interfere each other to form a stationary field of the SPP field around a focus, a scanning control unit (2) can achieve three-dimensional scanning and positioning for an atomic force microscope (AFM) metal probe (5) by means of an AFM controller (4), and a detection unit (3) achieves three-dimensional measurement and analysis for a longitudinal field component of a surface plasma field.

The invention provides a long-wavelength scanning near-field microscopic analysis system. The long-wavelength scanning near-field microscopic analysis system integrates broadband long-wavelength and single-frequency THz waves, utilizes a scanning probe to integrate a variable electric field, a variable magnetic field and a variable temperature field, fills the technical blank of long-wavelength wave bands in the near-field microscopy field, enables a near-field optic microscopic technology to be linked with a near-field microwave microscopic technology and provides an all-around sample physical property testing tool for scientific research persons.

Disclosed are an apparatus and a method for controlling a tracking servo in a near field optics. Gap error signals are detected in a divided state, and a push pull signal is compensated based on the detected gap error signals. A photo detector detecting the gap error signals is divided into two areas such that movement of an image formed on the photo detector can be detected. The push pull signal is compensated by subtracting a value proportional to a difference value between the two gap error signals detected in the photo detector. The difference value between the two gap error signals is proportional to a dc offset component included in the push pull signal. Accordingly, it is possible to simply remove a dc offset included in a push pull signal without largely modifying the near field optics, so that it is possible to exactly perform a tracking servo operation.

The invention belongs to the technical field of nanometer materials and thin film materials, and in particular relates to a transplantable ultrathin nanoporous gold membrane and a preparation method thereof. The Au-Cu alloy film was prepared by vacuum thermal evaporation, and after thermal annealing and dealloying with acid solution, a transplantable and self-supporting ultra-thin nanoporous gold film was prepared. The nanoporous gold membrane prepared by the invention has wide applications in the fields of catalysis, biosensing, porous electrodes, energy storage, microfluidic control and transmission media. The nanoporous gold film proposed by the invention also has special optical properties and high light transmission properties, and has important applications in the fields of nano gratings, nonlinear optics and near-field optics.

This invention relates to a heat-writing recorder medium and its system, which reads the materials through near-field optical laser writing-in data through magnetic resistance head. The recording media comprises the following: one baseboard; one recording layer formed on side of the baseboard; multiple micro round column lens formed between the baseboard and the recording layer to generate the near-field optics effect and reduce the light point size when writing in the recording layer.

The invention provides a double-frequency adjustable magnetic resonance artificial composite material based on a non-symmetric metal grating structure, which is characterized in that the material is produced through the following steps: selecting a quartz substrate and polishing the surface of the quartz substrate; evaporating a SiO2 film on the surface of the quartz substrate; evaporating a chromium film on the surface of the SiO2 film; coating a photoresist layer on the chromium film; preparing a medium grating structure on the photoresist by electron beam lithography method; eroding and exposing the chromium film by using the photoresist as a mask by wet etching technology; etching the medium grating structure on the SiO2 film by using the chromium film as a mask by dry etching technology, and removing the chromium film; laterally depositing a metal layer with the thickness of h on one side of the SiO2 grating structure by lateral vacuum deposition technology, similarly, depositinga metal layer with the same thickness on the other side of the SiO2 grating structure, thereby forming an n-shaped metal structure with the top thickness of 2h and the side wall width of h to completethe production of the double-frequency adjustable magnetic resonance artificial composite material based on the non-symmetric metal grating structure. The method has the characteristics of simple andconvenient production, small monolayer consumption, monolayer normal incidence and double frequency, and has revelatory significance and great application prospect in magnetic resonance, near-field optics, camouflage materials and other fields.

The present invention is selective micro machining method and system for different materials with near field optical virtual light probe. The present invention proposes selective micro machining with near field optical virtual light probe in nanometer size and provides one designed micro machining system. After the laser beam the laser emits after passing through the light filter and the polarizer is incidenced to the triangular prism, the refracted laser beam may be total internally reflected and the reflected laser beam out of the other side of the triangular prism is made to pass through the optical delayer and reflected by the reflector to the bottom of the triangular prism along the original path to form the virtual light probe. The material to be machined is set in certain distance below the bottom of the triangular prism for micro machining with the virtual light probe while being micro shifted with some miniature stage. The present invention has raised micro machining precision.