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Proceedings Paper

Optical fiber biosensor based on multiple total internal reflections in heterodyne interferometry
Author(s): Shinn-Fwu Wang; Jyh-Shyan Chiu; Ming-Jen Wang
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Paper Abstract

In this paper, an optical fiber biosensor based on multiple total internal reflections in heterodyne interferometry is proposed. The sensor is made of a long U-shaped multimode optical fiber which cladding is removed from the sensing portion of the fiber. With the optical fiber biosensor the phase shift difference due to the multiple total internal reflections (MTIR) effect between the P and S-polarizations is measured by using heterodyne interferometry with the optical fiber biosensor. Substituting the phase shift difference into Fresnel's equations, the refractive index for the tested medium can be calculated. The resolution of the sensor can reach 1.58×10-6 refractive index unit (RIU). The optical fiber biosensor could be valuable for chemical, biological and biochemical sensing. It has some merits, such as, high resolution and stability, small size and real-time measurement.

Paper Details

Date Published: 1 November 2007
PDF: 7 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64231H (1 November 2007); doi: 10.1117/12.779402
Show Author Affiliations
Shinn-Fwu Wang, Ching Yun Univ. (Taiwan)
Jyh-Shyan Chiu, Ching Yun Univ. (Taiwan)
Ming-Jen Wang, Ching Yun Univ. (Taiwan)


Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering

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