Article Dans Une Revue SN Applied Sciences Année : 2020

How to determine the complex refractive index from infrared reflectance spectroscopy?

Résumé

A new theoretical methodology enabling the determination of the complex refractive index has been developed and explored; it only requires to use a classical setup to control the incident angle, without the need for a polarizer. As a proof of concept, this new methodology has been successfully applied to investigate the optical properties of amorphous silica in the mid-infrared spectral range and validated by comparison with a standard routine based on polarization state of the light. This work thus makes it possible to determine the complex refractive index of an isotropic material by a reflectance measurement without needing to control the polarization of light. The refractive index can be measured with a relative uncertainty close to 10 −3 over a wide range of wavelengths, as needed for a growing number of optical applications. Therefore, this new technique is cost effective and permits the accurate assessment of the refractive index in the whole infrared range.

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hal-03517856 , version 1 (25-10-2022)

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Thomas Bonnal, Ali Belarouci, Régis Orobtchouk, Elodie Prud'Homme, Solene Tadier, et al.. How to determine the complex refractive index from infrared reflectance spectroscopy?. SN Applied Sciences, 2020, 2 (12), pp.2070. ⟨10.1007/s42452-020-03869-7⟩. ⟨hal-03517856⟩
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