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Mohammed, Guendouz
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Development of an integrated optical sensor on chalcogenide glasses and on porous silicon for the mid-infrared spectroscopy
Abstract
This work presents the development of photonic integrated circuits based on chalcogenide glasses and porous silicon materials dedicated to mid-infrared (mid-IR) sensing. Optical losses of the different platforms are measured for a wavelength range spanning from 4.0 to 4.44 μm and 6.9 to 8.8 μm. At 4.28 μm, corresponding to carbon dioxide maximum absorption, propagation losses of 6.00 ± 0.46 dB/cm and 11.76 ± 0.2 dB/cm are demonstrated using, respectively, chalcogenide and porous silicon platforms. Based on these losses and interaction schemes between optical field and target molecules, either evanescent or volume detection, the expected sensitivity and limit of detection of both platforms are discussed. Experimental demonstration of C02 sensing in the mid-IR using both chalcogenide and porous silicon platforms is also provided.