Manufacturing method of metal film plated double-humped resonance liquid sensor based on SPR (Surface Plasmon Resonance)

Abstract

The invention discloses a manufacturing method of a metal film plated double-humped resonance liquid sensor based on SPR (Surface Plasmon Resonance), which comprises the steps of: (1) engraving a double-humped long-cycle fiber grating; (2) determining the plating thickness of a metal film; (3) plating the metal film on a cladding layer of the fiber grating; (4) manufacturing a sensor; and (5) detecting double-hump signals. The invention provides a manufacturing method of a miniaturized, high integrated and high-sensitive film plated fiber grating liquid sensor capable of remotely measuring, and the SPR effect at the interface of the metal film and a liquid medium and the double-humped resonance effect of the fiber grating are effectively utilized. The sensor manufactured by using the method has high sensitivity on a detected liquid and has a measurement resolution up to 10<-7> on the liquid refractive index. Due to the integration of the advantages of the SPR effect, the double-humpedresonance effect and fiber grating sensing, the manufacturing method can be widely applied to manufacturing optical chemical sensors.

Description

technical field [0001] The invention relates to a manufacturing method of a liquid sensor, in particular to a manufacturing method of a liquid sensor based on an SPR metal-coated double-peak resonant long-period optical fiber grating. Background technique [0002] Since the surface plasmon resonance (SPR) technology was first used in the field of chemical sensor research in 1982, SPR sensors have gradually become a research hotspot in the international sensor field. Prism, grating and waveguide SPR sensors emerged and have been widely used. In particular, optical fiber SPR sensors have the advantages of small size, simple operation, and can realize online real-time long-distance detection and monitoring. [0003] Long-period fiber grating (long-period fiber grating, LPFG) is a photo-induced fiber core refractive index change fiber device. Compared with short-period fiber gratings (i.e. Bragg fiber gratings), LPFGs are particularly sensitive to changes in the refractive ind...

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Problems solved by technology

However, the research on the liquid refractive index (or concentration) sensing of metal-coated double-peak resonant long-period fiber gratings based on the SPR effect has not been reported so far.

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