Dispersion analysis with inverse dielectric function modelling

Thomas G Mayerhöfer; Vladimir Ivanovski; Jürgen Popp

doi:10.1016/j.saa.2016.05.055

Dispersion analysis with inverse dielectric function modelling

Spectrochim Acta A Mol Biomol Spectrosc. 2016 Nov 5:168:212-217. doi: 10.1016/j.saa.2016.05.055. Epub 2016 Jun 2.

Authors

Thomas G Mayerhöfer¹, Vladimir Ivanovski², Jürgen Popp³

Affiliations

¹ Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, D-07745 Jena, Germany; Institute of Physical Chemistry, and Abbe Center of Photonics, Friedrich Schiller University, Jena D-07743, Helmholtzweg 4, Germany. Electronic address: Thomas.Mayerhoefer@ipht-jena.de.
² Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Sts. Cyril and Methodius University, Arhimedova 5, 1000, Skopje, Macedonia.
³ Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Str. 9, D-07745 Jena, Germany; Institute of Physical Chemistry, and Abbe Center of Photonics, Friedrich Schiller University, Jena D-07743, Helmholtzweg 4, Germany.

PMID: 27294550
DOI: 10.1016/j.saa.2016.05.055

Abstract

We investigate how dispersion analysis can profit from the use of a Lorentz-type description of the inverse dielectric function. In particular at higher angles of incidence, reflectance spectra using p-polarized light are dominated by bands from modes that have their transition moments perpendicular to the surface. Accordingly, the spectra increasingly resemble inverse dielectric functions. A corresponding description can therefore eliminate the complex dependencies of the dispersion parameters, allow their determination and facilitate a more accurate description of the optical properties of single crystals.

Keywords: Dielectric function modelling; Dispersion analysis; Infrared spectroscopy; Perpendicular modes; Reflectance spectroscopy.