Comparative Study Between Dispersive and Non-Dispersive Dielectric Permittivity in Spectral Remittances of Chiral Sculptured Zirconia Thin Films

TL;DR

This study compares dispersive and non-dispersive dielectric permittivity effects on spectral remittances in chiral zirconia thin films, revealing significant dispersion impacts especially near the homogenization wavelength.

Contribution

It provides a detailed spectral comparison highlighting the importance of dielectric dispersion in modeling chiral thin film optical properties.

Findings

Dispersion significantly affects spectral results, especially at wavelengths away from the homogenization point.

Differences are notable in cross-polarized reflectances near the Bragg peak.

Dispersion effects are most pronounced near the homogenization wavelength.

Abstract

The transmission and reflection spectra from a right-handed chiral sculptured zirconia thin film are calculated using the piecewise homogeneity approximation method and the Bruggeman homogenization formalism by considering that the propagation of both dispersive and non-dispersive dielectric function occurs for axial and non-axial states. The comparison of spectral results shows that the dispersion of the dielectric function has a considerable effect on the results. In axial excitation of cross-polarized reflectances and co-polarized transmittances the dispersion effect becomes more pronounced at wavelengths further away from the homogenization wavelength. This is also true in case of non-axial excitation of circular transmittances, while there are considerable differences for cross-polarized reflectances where (wavelength) the first Bragg peak occurs. At wavelengths in the vicinity of the homogenization wavelength the dispersion effect of the dielectric function in becomes more significant.