Informace o publikaci

Wide spectral range optical characterization of niobium pentoxide (Nb2O5) films by universal dispersion model

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FRANTA Daniel HRONCOVÁ Beáta DVOŘÁK Jan VOHÁNKA Jiří FRANTA Pavel OHLÍDAL Ivan PEKAŘ Václav ŠKODA David

Rok publikování 2024
Druh Článek v odborném periodiku
Časopis / Zdroj Optical Materials
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.sciencedirect.com/science/article/pii/S0925346724013168
Doi http://dx.doi.org/10.1016/j.optmat.2024.116133
Klíčová slova Optical constants; Ellipsometry; Spectrophotometry; Optical films
Popis In this work, the optical properties of niobium pentoxide (Nb2O5) films were extensively studied across a wide spectral range using heterogeneous data-processing methods, combining ellipsometric and spectrophotometric measurements for five samples with thicknesses between 20 and 250 nm. This study primarily determined the optical constants of Nb2O5 from the far infrared to the vacuum ultraviolet, presenting these constants as dispersion parameters using the universal dispersion model to describe valence electron excitations in ultraviolet region as well as phonon vibrations in infrared region. These comprehensive and reliable data across such a broad spectral range are unprecedented. Secondly, presented optical characterization proofs that Nb2O5 films can be grown without defects such as surface roughness, porosity, or inhomogeneity. This fact, together with its high refractive index, makes Nb2O5 a promising material for optical applications.
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