Hybrid method to calculate the spectral optical constants (n, k) of smooth and rough bulk samples

Gilles Fortin

doi:10.1117/12.2618305

30 May 2022 Hybrid method to calculate the spectral optical constants (n, k) of smooth and rough bulk samples

Gilles Fortin

Proceedings Volume 12116, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIII; 1211609 (2022) https://doi.org/10.1117/12.2618305
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

Spectra of the optical constants (n, k) of a substance are often obtained by comparing spectroscopic measurements of a bulk sample with a simulation model. The reflectance method requires a sample with a perfectly smooth surface to give unbiased values of n and k. The ellipsometric method generates n and k spectra which are accurate in general but which sometimes generate errors over limited spectral ranges when simulating polarized reflectance. We propose a new hybrid method to calculate reliable spectra of n and k. The proposed method uses both ellipsometric and s-polarized reflectance measurements and takes into account the potential roughness of the sample’s surface with the help of a specularity factor. The proposed method provides n and k that better simulate polarized reflectance measurements and applies to isotropic bulk samples with either smooth or rough flat surfaces. We provide demonstrations in the infrared spectral region with a smooth sample and a rough sample.

Conference Presentation

Citation Download Citation

Gilles Fortin "Hybrid method to calculate the spectral optical constants (n, k) of smooth and rough bulk samples", Proc. SPIE 12116, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXIII, 1211609 (30 May 2022); https://doi.org/10.1117/12.2618305

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