Optical Spectra of Graded Nanostructured TiO2 Chiral Thin Films

TL;DR

This study uses RCWA to analyze how structural parameters affect optical filtering and polarization in graded chiral TiO2 thin films, aligning well with experimental data.

Contribution

It applies RCWA with Bruggeman formalism to model optical properties of graded chiral TiO2 films, providing insights into their filtering and polarization characteristics.

Findings

Filtering frequency depends on structural parameters

Polarization selectivity varies with film structure

Model results agree with experimental data

Abstract

The rigorous coupled wave analysis method (RCWA) is applied to the graded chiral TiO2 thin films in axial and non-axial excited states using the Bruggeman homogenization formalism. The dependence of the filtering frequency and polarization selectivity as a function of different structural parameters, are investigated. A good agreement with experimental results reported by other researchers is achieved.