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Optical Engineering

Optimization of bandpass optical filters based on TiO2 nanolayers
Author(s): Nathalie Démarest; Damien Deubel; Jean-Claude Keromnès; Claude Vaudry; Fabien Grasset; Ronan Lefort; Maryline Guilloux-Viry
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Paper Abstract

The design and realization of high-quality bandpass optical filters are often very difficult tasks due to the strong correlation of the optical index of dielectric thin films to their final thickness, as observed in many industrial deposition processes. We report on the optimization of complex optical filters in the visible and NIR spectral ranges as realized by ion beam-assisted electron beam deposition of silica and titanium oxide multilayers. We show that this process always leads to amorphous films prior to thermal annealing. On the contrary, the optical dispersion of TiO2 nanolayers is highly dependent on their thickness, while this dependence vanishes for layers thicker than 100 nm. We demonstrate that accounting for this nonlinear dependence of the optical index is both very important and necessary in order to obtain high-quality optical filters.

Paper Details

Date Published: 2 January 2015
PDF: 7 pages
Opt. Eng. 54(1) 015101 doi: 10.1117/1.OE.54.1.015101
Published in: Optical Engineering Volume 54, Issue 1
Show Author Affiliations
Nathalie Démarest, KERDRY Thin Film Technologies (France)
Institut des Sciences Chimiques de Rennes (France)
Damien Deubel, KERDRY Thin Film Technologies (France)
Jean-Claude Keromnès, KERDRY Thin Film Technologies (France)
Claude Vaudry, KERDRY Thin Film Technologies (France)
Fabien Grasset, Institut des Sciences Chimiques de Rennes (France)
National Institute of Material Science (Japan)
Ronan Lefort, Institut de Physique de Rennes (France)
Maryline Guilloux-Viry, Institut des Sciences Chimiques de Rennes (France)

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