Surface plasma resonance detection optical fiber and sensor

Abstract

The invention relates to a detection optical fiber based on a surface plasma resonance principle and a sensor. The surface plasma resonance detection optical fiber comprises a fiber core and air holes arranged on the axial direction of the fiber core and is characterized in that the first air hole of a solution channel for detecting is positioned in the center of the cross section of the optical fiber; the inner wall of the first air hole is plated with a metal film; a sensing material is plated on the inner surface of the metal film; N second air holes are distributed in the fiber core and at the periphery of the first air hole uniformly and respectively; N is an integer of more than 1; and the connecting line of the central points of the N air holes is shaped like a regular N-side polygon. According to the detection, mutual influence among the conventional channels of various samples is avoided, the resonance spectrum is narrow, and the signal to noise ratio is high. The sensor breaks through the limit that the refractive index detection upper limit of the conventional similar sensor is less than 1.42 and can effectively detect the chemical organic solution with high refractive index.

Description

technical field [0001] The invention relates to the technical fields of biochemical detection and optical fiber sensing, in particular to a detection optical fiber and a sensor based on the principle of surface plasmon resonance. Background technique [0002] Surface Plasmon Resonance (SPR) is a physical optical phenomenon that occurs at the interface between metal and dielectric. Since the SPR phenomenon is extremely sensitive to the incident conditions of light and the change of the dielectric constant of the environmental medium, the SPR sensing technology has gained a lot of attention in the field of biochemical sensing due to its advantages of high sensitivity, label-free, non-destructive, and remote real-time online monitoring. The sustained attention of researchers from all over the world. In order to achieve local measurement and remote monitoring, as early as 1990, some scholars proposed the optical fiber SPR sensor using optical fiber as the excitation medium. Us...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a closed, all-fiber surface plasmon resonance detection fiber and sensor with a large dynamic measurement range, aiming to solve the problem of the small dynamic measurement range and linearity of the existing SPR sensor based on photonic crystal fiber. Defects with low precision, low signal-to-noise ratio, metal film plating and sample filling workload

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