Design of Planar Optic Sensors for Hydrocarbon Detection |
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Authors: | D'Orazio A Desario M Giasi C Mescia L Petruzzelli V Prudenzano F |
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Institution: | (1) Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, Via E. Orabona, 4-70125 Bari, Italy;(2) Dipartimento di Ingegneria Civile e Ambientale, Politecnico di Bari, Via E. Orabona, 4-70125 Bari, Italy;(3) Dipartimento di Ingegneria dell'Ambiente e per lo Sviluppo Sostenibile, Politecnico di Bari, Via E. Orabona, 4-70125 Bari, Italy |
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Abstract: | A realistic design of evanescent field optical sensors, constituted by three different kinds of planar waveguides covered
by a sensing polymeric overlay, is performed. More precisely, the slab, the embedded strip and the ridge waveguides are considered.
The sensor operation is simulated, in both the cases of lossy guided and leaky mode propagation, via a home made computer code. The optimal waveguide transverse section and length are identified, the advantages and drawbacks
are shown. The ridge waveguide sensor exhibits appreciable characteristics: for a concentration C
w = 200 ppm of toluene in water, the absorbance pertaining to a device L = 2.6 cm long and for the guided quasi-TE00 mode is A ≅ 5, while it is A ≅ 0.054 for a device long L ≅ 24.1 μm and the leaky quasi-TE10 mode. The simulation results suggest that a selective excitation of the suitable propagation mode can enhance the sensor
performance. |
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Keywords: | integrated optics leaky wave propagation optical sensors optical waveguides |
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