27 April 2009 Photonic crystal fiber modal interferometers for accurate refractometry
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Abstract
We report on compact and simple refractive index sensors suitable for measuring indexes in the 1.320-1.432 range with high resolution. The devices are based on modal interference and consist of a stub of large-mode area photonic crystal fiber spliced to standard single mode fiber. In the splice regions the voids of the holey fiber are fully collapsed which allows the coupling and recombination of core and cladding modes. The devices are robust and highly stable over time. The interference patterns are observed in a broad wavelengths range. The devices operate in both reflection or in transmission mode.
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J. Villatoro, R. Jha, G. Badenes, "Photonic crystal fiber modal interferometers for accurate refractometry", Proc. SPIE 7316, Fiber Optic Sensors and Applications VI, 73161B (27 April 2009); doi: 10.1117/12.818266; https://doi.org/10.1117/12.818266
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