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Effects of surface roughness on optical properties and sensitivity of fiber-optic evanescent wave sensors

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Abstract

The effects of surface roughness on the light transmission properties and sensitivity of fiber-optic evanescent wave sensors are investigated. A simple method of increasing the sensitivity based on the surface roughness (pit depth δ and diameter Δ) and incident angle Ui of light rays on the fiber input end is proposed. We discovered that as 2δ/Δ increases, the transmitted light intensity decreases, but the sensitivity initially increases and then decreases. In sensors containing fibers of various roughnesses, the sensitivity to glucose solutions reached 11.7mW/riu at 2δ/Δ=0.32 and increased further to 15.3mW/riu with proper adjustment of Ui.

© 2013 Optical Society of America

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