Novel high-sensitivity photonic-crystal optical fiber sensor

Abstract

The invention relates to a novel high-sensitivity photonic-crystal optical fiber sensor. The novel high-sensitivity photonic-crystal optical fiber sensor comprises a substrate material, wherein a photonic crystal optical fiber cladding and a fiber core are arranged on the substrate material, the substrate material is circular, an open groove is formed in the circular substrate material, a camberedshape of the open groove is one cambered surface of a Reuleaux triangle, the photonic crystal optical fiber cladding consists of two big air holes and small air holes, cross sections of the two big air holes are fan-shaped, curved lines, where sectors of two sides of the two big air holes are located, are one part of the Reuleaux triangle and one part of a circle separately, arc lines, where inner sectors of the two big air holes are located, and an arc, where an cambered surface of the bottom of the groove is located, are three arcs of the Reuleaux triangle separately, bridge arms are arranged between the big air holes and the groove among the big air holes and are connected with the Reuleaux triangle, the small air holes consist of bridge-arm small air holes and cladding small air holes, the bridge-arm small air holes are formed in the bridge arms, the cladding small air holes are formed in the Reuleaux triangle, a low-refractive-index liquid hole is formed in the center position ofthe Reuleaux triangle, and a gold nano-film is arranged on the cambered surface of the bottom of the groove.

Description

technical field [0001] The invention relates to the technical field of photonic crystal fiber sensing, in particular to the technical field of high-sensitivity sensing and detection. Background technique [0002] Surface plasmon resonance (SPR) technology has always attracted the interest of researchers in related fields because of its unique advantages. As one of the applications of SPR technology, SPR-based optical fiber sensing technology has also been explored and improved. Ordinary optical fibers have disadvantages such as becoming brittle and easily damaged after being polished, complex polishing process and difficult phase matching. These shortcomings have been solved after the emergence of photonic crystal fibers. Photonic crystal fiber evanescent wave sensing technology can be divided into photonic crystal fiber evanescent wave absorption sensing technology, photonic crystal fiber evanescent wave excited fluorescent label sensing technology and photonic crystal fibe...

AI Technical Summary

Problems solved by technology

The optical fiber is a newly designed three-bridge photonic crystal fiber with a Leroux triangular structure. After polishing a large air hole, an open groove is formed. The groove is coated with a gold nano-film near the core, and the liquid to be tested is placed in the groove. The inside does not need to be connected to a closed air hole, which solves the problems of difficult coating of small-sized air holes and difficult filling of the liquid to be tested

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