Abstract
A simple D-shaped plastic multimode fiber optic sensor is proposed and demonstrated for refractive index testing. The D-shaped fiber is fabricated using the wheel side-polishing method. Experimental results exhibit a good linear relationship between the receiving optical power and the refractive index of the test medium. Different parameters, such as the depth, the length and the bending of the D-shaped region, are taken into account to analyze and optimize the sensitivity of the sensor. Normalized transmittance intensity decreases 13.4% with the refractive index increasing from 1.333 to 1.455 when the depth and length are 500μm and 2cm with excurvature radius of 5cm and optical source wavelength of 652nm. For different refractive indices of the test medium, we simulate the energy distribution of the D-type structure by using Finite Element Method, which achieves a good agreement between the experimental and theoretical results. Such a low-cost and easily fabricated structure will be competitive for remote and continuous measurement of refractive index in chemical, biological, and biochemical sensing areas.
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