11 November 2014 Tunable mode coupler in the microfluidic channel for the fiber optics refractive index sensor
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Abstract
We propose and demonstrate a highly sensitive optical fiber microfluidic refractometer. A microhole is fabricated in the photonic crystal fiber (PCF) by using femtosecond laser beam, which combines the tunable mode coupler and microfluidic channel. The mode field diameter of the guided light is changed with the refractive index in the microfluidic channel, which results in the tunable coupling ratio between the core and the cladding in the PCF. Therefore, the refractive index of the liquid in the microfluidic channel is detected by interrogating the fringe visibility of the reflection spectrum. These experiments results demonstrate that the sensor is insensitive with the temperature and strain, and a RI sensitivity of up to 150.7 dB∕RIU is achieved, establishing the tunable mode coupler as a sensitive and versatile sensor.
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R. Gao, R. Gao, G. Li, G. Li, Y. Zhou, Y. Zhou, Y. Jiang, Y. Jiang, } "Tunable mode coupler in the microfluidic channel for the fiber optics refractive index sensor", Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 927415 (11 November 2014); doi: 10.1117/12.2070720; https://doi.org/10.1117/12.2070720
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