Evanescent Field Study on a U-Shaped Silica Fiber Absorption Sensor Using Non-Sequential Ray Tracing

Abstract:

The ray tracing of unclad U-shape multimode fiber optic is examined by using Zemax simulation have been proposed. The influence of the geometry of sensing region such as absorbing medium refractive index, n₂, shape of fiber and the bending radius is analyzed. Number of analysis ray is determined and the value of n₂ is varied at 1, 1.3314, 1.359, 1.36, 1.37 and 1.4. The intensity of light propagate inside the fiber is reducing at high n₂ and this graph pattern is supported by experimental result. A U-shaped sensor is used for the analysis because of the sensitivity is higher than straight fiber design due to their higher penetration depth. Zemax simulation shows that the fiber with bending radius 1.5 mm has higher response compared to fiber with radius 2.5 mm.

• Periodical: Solid State Phenomena (Volume 268)
• Pages: 413-417
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.268.413
• Online since: October 2017
• Authors: Affa Rozana Abdul Rashid*, Wan Maisarah Mukhtar, Karsono A. Dasuki, Abang Annuar Ehsan, Sahbudin Shaari
• Keywords: Unclad Silica Fiber Optic, ZEMAX Simulation

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