A side-polished open-loop pcf-spr sensor

Abstract

The invention discloses a side surface polished open-loop PCF-SPR sensor. The side surface polished open-loop PCF-SPR sensor comprises a fiber core and a cladding covered outside the fiber core, wherein the fiber core is eccentric with the cladding, and the cladding is provided with air holes which are arranged in the axial direction of the fiber core; the air holes comprises a first air hole, a plurality of second air holes and a plurality of third air holes, the first air hole is arranged at the center of the cross section of the optical fiber, the second air holes surround the first air hole to form an annular N-angle structure with a layer number of K, and the third air holes are symmetrically arranged on two sides of the fiber core to substitute the positions of second air holes; theside surface of an optical fiber is provided with a polishing plane, and the polishing plane is provided with an open loop; and the open loop is covered with a sensing membrane, and the open ring is used as a sensing channel. By adopting a way of combining the side surface polished optical-fiber end surface and the open loop, the SPR sensing layer is most closest to the fiber core, so that substances with a refractive index less than 1.3 such as liquid oxygen, liquid CO2, fluorine-containing organic matters can be detected sensitively at a high amplitude or high wavelength and can be sensed byvirtue of multiple channels, so that the application range of the existing PCF-SPR sensor can be enlarged.

Description

technical field [0001] The invention relates to the technical fields of biochemical detection and optical fiber sensing, and more particularly relates to a side-polished open-loop PCF-SPR sensor. Background technique [0002] Surface Plasmon Resonance (SPR) sensing technology is an advanced optical sensing technology. Surface plasmons (Surface Plasmon, SP for short) propagating at the interface between metal and dielectric are extremely sensitive to incident light and changes in the refractive index of the medium to be measured. A large number of SPR sensors have been manufactured based on this principle. Conventional SPR sensors such as the prism type are not suitable for applications based on moving optical and mechanical parts due to their bulky size. This limitation led to the emergence of fiber-optic-based SPR sensors in the 1990s. Usually, the cladding of the ordinary optical fiber is stripped first, and then a gold or silver film is plated on the fiber core. The evan...

AI Technical Summary

Problems solved by technology

[0003] In view of the above defects, the present invention provides a side polished open-loop PCF-SPR sensor, which aims to solve the technical problem of low sensitivity of the existing PCF-SPR sensor

Images