A Near Field Scanning Probe Based on Plasma Focusing
A near-field scanning and plasma technology, applied in the field of scanning probes, which can solve the problems of insufficient probe energy focusing ability and limited enhancement ability, etc.
Active Publication Date: 2020-10-27
SOUTHEAST UNIV
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[0005] Purpose of the invention: The purpose of the invention is to provide a near-field scanning probe based on plasma focusing, which improves the focusing efficiency of light energy and enhances the focusing strength of the needle tip, and solves the problem of insufficient energy focusing ability of the probe in the prior art and limited enhancement ability The problem
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[0019] The present invention will be further described below in conjunction with accompanying drawing.
[0020] like figure 1 As shown, the present invention includes an optical fiber 1 and a three-dimensional micro-nano waveguide structure. The end face of the optical fiber 1 needs to be polished, and the center of the optical fiber 1 is provided with a light-through hole 2 that runs through its length direction. The optical fiber 1 is a single-mode or multi-mode optical fiber. The outer diameter ranges from 125 μm to 800 μm. The end face of the optical fiber 1 is provided with a three-dimensional micro-nano waveguide structure for plasmon focusing. The waveguide structure includes a support 3 and a focusing structure 4. The support 3 is vertically arranged between the optical fiber 1 and the focusing structure 4. The focusing structure 4 adopts a pyramidal structure. , and cover the optical hole 2 on the end face of the optical fiber 1. The focusing structure 4 is prepared...
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Abstract
The invention discloses a near field scanning probe based on plasma focusing. The probe comprises an optical fiber and a waveguide structure. The center of the optical fiber is provided with a light through hole penetrating a length direction. The end surface of the optical fiber is provided with the waveguide structure. The waveguide structure comprises a support and a focusing structure. The support is located between the optical fiber and the focusing structure. The focusing structure adopts a cone structure and covers the light through hole of the end surface of the optical fiber. The focusing structure is formed by a partial sphere base and a cone. One end of the sphere base is connected to the end surface of the optical fiber and the other end is tangent to the side surface of the cone. The other side surface of the cone is obliquely connected to the end surface of the optical fiber. A tip exceeds the side surface of the optical fiber. In the invention, a lithography mode is adopted to process a tip focusing structure, a processing mode is flexible, has high precision, spends short time and possesses low cost; the mode is convenient for mass production; and through adjustingthe laser power and the scanning rate of optical cement polymerization during a processing process, the elastic coefficient and the modulus of the tip structure are controlled so that the probe is suitable for the multiple types of sample detection.
Description
technical field [0001] The invention relates to a scanning probe, in particular to a near-field scanning probe based on plasma focusing. Background technique [0002] Surface plasmon is a kind of electron density wave propagating along the metal surface excited by light incident on the metal surface. Its wavelength is much smaller than the wavelength of visible light, so the propagating energy is concentrated at the nanoscale beyond the diffraction limit, so Directing propagation and focusing energy by studying surface plasmon waveguides is an important topic in physical optics. The principle of surface plasmon focusing is based on the selective absorption of light energy in a specific band by free electrons on the metal surface, so it has a specific absorption-scattering spectrum. Since this absorption is extremely sensitive to the external environment, the corresponding spectral analysis can be realized. Real-time sensing of the external environment is widely used in bioc...
Claims
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IPC IPC(8): G01Q60/22
CPCG01Q60/22
Inventor 顾忠泽赵祥伟孙良栋陈洪渊
Owner SOUTHEAST UNIV