Numerical modelling for micropillar-enhanced silicon ATR crystals for mid-infrared spectroscopy of biomarkers

Ahmed M. Othman; Yasser M. Sabry; Diaa Khalil; Tarik Bourouina

doi:10.1117/12.2649104

16 March 2023 Numerical modelling for micropillar-enhanced silicon ATR crystals for mid-infrared spectroscopy of biomarkers

Ahmed M. Othman, Yasser M. Sabry, Diaa Khalil, Tarik Bourouina

Author Affiliations +

Proceedings Volume 12387, Optical Diagnostics and Sensing XXIII: Toward Point-of-Care Diagnostics; 123870J (2023) https://doi.org/10.1117/12.2649104
Event: SPIE BiOS, 2023, San Francisco, California, United States

Conference Poster

Abstract

Attenuated total reflection (ATR) spectroscopy is a powerful tool for the optical analysis of biomarkers in the mid-infrared spectral range. We study the signal-enhanced ATR spectroscopy of silicon ATR crystals using silicon micropillars etched on the active surface of the silicon crystal, where we use an effective-index approximation for the micropillar layer as the micropillars are much smaller than the optical wavelength. The reflectance, as well as the effective length due to using the micropillars are calculated as a function of wavelength using a model based on the Fresnel equations. The path length is shown to possibly increase by up to 10X due to using these pillars.

Citation Download Citation

Ahmed M. Othman, Yasser M. Sabry, Diaa Khalil, and Tarik Bourouina "Numerical modelling for micropillar-enhanced silicon ATR crystals for mid-infrared spectroscopy of biomarkers", Proc. SPIE 12387, Optical Diagnostics and Sensing XXIII: Toward Point-of-Care Diagnostics, 123870J (16 March 2023); https://doi.org/10.1117/12.2649104

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