Wave optics based modeling of tapered chalcogenide fibers as sensing elements for the mid-IR spectroscopy

Svetlana V. Korsakova; Elena A. Romanova; Vladimir S. Shiryaev

doi:10.1117/12.2625808

29 April 2022 Wave optics based modeling of tapered chalcogenide fibers as sensing elements for the mid-IR spectroscopy

Svetlana V. Korsakova, Elena A. Romanova, Vladimir S. Shiryaev

Proceedings Volume 12193, Laser Physics, Photonic Technologies, and Molecular Modeling; 1219309 (2022) https://doi.org/10.1117/12.2625808
Event: XXV Annual Conference Saratov Fall Meeting 2021; and IX Symposium on Optics and Biophotonics, 2021, Saratov, Russian Federation

Abstract

The mid-IR spectroscopy provides a universal tool for the real-time remote monitoring of various molecular species. In this study, we apply the wave optics based approach to analyze the functionality of spectroscopic sensors with sensing elements based on tapered multimode chalcogenide fibers. By using the method of local modes, the sensing elements transmittance, sensitivity and detection limit have been calculated. These characteristics are shown to depend on the longitudinal profile of the taper diameter, linear or exponential in our case. The ratio of the taper length to the power attenuation length of a local mode is a key parameter for sensitivity optimization. The detection limit of the spectroscopic measurements can be significantly reduced by delivering radiation in the higher-order local modes of the taper.

Citation Download Citation

Svetlana V. Korsakova, Elena A. Romanova, and Vladimir S. Shiryaev "Wave optics based modeling of tapered chalcogenide fibers as sensing elements for the mid-IR spectroscopy", Proc. SPIE 12193, Laser Physics, Photonic Technologies, and Molecular Modeling, 1219309 (29 April 2022); https://doi.org/10.1117/12.2625808

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