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Proceedings Paper

Tunable mode coupler in the microfluidic channel for the fiber optics refractive index sensor
Author(s): R. Gao; G. Li; Y. Zhou; Y. Jiang
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Paper 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.

Paper Details

Date Published: 11 November 2014
PDF: 7 pages
Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 927415 (11 November 2014); doi: 10.1117/12.2070720
Show Author Affiliations
R. Gao, Beijing Institute of Technology (China)
G. Li, The Aerospace Science Ctr. (China)
Y. Zhou, The Aerospace Science Ctr. (China)
Y. Jiang, Beijing Institute of Technology (China)

Published in SPIE Proceedings Vol. 9274:
Advanced Sensor Systems and Applications VI
Tiegen Liu; Shibin Jiang; Niels Neumann, Editor(s)

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