Optical fiber biosensor based on multiple total internal reflections in heterodyne interferometry

Shinn-Fwu Wang; Jyh-Shyan Chiu; Ming-Jen Wang

doi:10.1117/12.779402

1 November 2007 Optical fiber biosensor based on multiple total internal reflections in heterodyne interferometry

Shinn-Fwu Wang, Jyh-Shyan Chiu, Ming-Jen Wang

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64231H (2007) https://doi.org/10.1117/12.779402
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

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.

Citation Download Citation

Shinn-Fwu Wang, Jyh-Shyan Chiu, and Ming-Jen Wang "Optical fiber biosensor based on multiple total internal reflections in heterodyne interferometry", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64231H (1 November 2007); https://doi.org/10.1117/12.779402

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KEYWORDS

Heterodyning

Optical fibers

Biosensors

Fiber optics sensors

Refractive index

Sensors

Interferometry

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