High Sensitivity Refractive Index Sensor Based on Tapered Four-Core Fiber
A refractive index sensor based on tapered four-core fiber is proposed in this paper.With the aid of a hydrogen-oxygen flame,the four-core fiber was progressively tapered between two segments of a multimode fiber.By simulating the light field of the sensing part,we prove that the tapered four-core fiber will produce stronger interference effect.Experimental results show that the sensor has a maximum refractive index sensitivity of 298.307 nm/RIU and a linearity of 99.806%.The sensor is also insensitive to temperature,which effectively avoids the cross-sensitivity effect between temperature and refractive index.With its small size and high sensitivity,the sensor is expected to have potential applications in biological and chemical sensing.
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