Optimization of Fiber-Optic Evanescent Wave Spectroscopy: A Monte Carlo Approach

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Abstract:

The absorbance of the evanescent waves of infrared radiation transmitted through an optical fiber depends on the geometry of the fiber in addition to the wavelength of the electromagnetic radiation. The signal can thus be enhanced by flattening the midsection of the fiber. While the dependence of the absorbance on the thickness of the midsection has already been studied and experimented upon, we demonstrate that similar results are obtained using Monte Carlo methods based simply on geometrical optics, given the dimensions of the fiber and the power distribution of the fired rays. The optimization can be extended to fibers with more complex geometries of the sensor.

Keywords: EVANESCENT FIELD; FIBER OPTICS; MONTE CARLO SIMULATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209789379349

Affiliations: 1: Negev Monte Carlo Research Center, SCE - Sami Shamoon College of Engineering, Beer Sheva 84100 Israel 2: Negev Monte Carlo Research Center, SCE - Sami Shamoon College of Engineering, Beer Sheva 84100 Israel; Department of Software Engineering, SCE - Sami Shamoon College of Engineering, Beer Sheva 84100 Israel 3: Department of Applied Physics, Ariel University Center, Ariel 40700, Israel 4: The School of Physics and Astronomy, The Raymond and Beverly Sackler Faculty of Exact Sciences. Tel Aviv University, Tel Aviv 69978, Israel 5: Department of Physics, Ben-Gurion University, Beer-Sheva 84105, Israel

Publication date: September 1, 2009

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