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Article Dans Une Revue Optical Materials Express Année : 2023

Timescale dependent sign of amorphous titanium dioxide thermo-optic coefficient

Résumé

We report on the thermo-optic properties of electron-beam evaporated amorphous titanium dioxide (TiO 2 ) at different timescales. We investigate the thermo-optic response of TiO 2 from static regime down to the micro-second regime by applying Joule heating on hybrid metallo-dielectric integrated Mach-Zehnder interferometers. We show that amorphous TiO 2 exhibits a very large negative thermo-optical coefficient in the range of -6.5×10 −4 K −1 at 1550 nm at typical timescales of a few seconds. Such a slow thermo-optic response is consistent with an organic origin of amorphous TiO 2 negative thermo-optic coefficient. However, when observed at the micro-second timescale, we show that the same amorphous TiO 2 has a positive thermo-optic coefficient, just like many other materials. Based on our results, TiO 2 can be conveniently deployed in energy-effective integrated optic devices by taking into account the specific multi-timescale thermo-optic properties of this material.
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hal-04287458 , version 1 (15-11-2023)

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Jean-Claude Weeber, Aurore Andrieux, Marie-Maxime Gourier, Juan Arocas, Laurent Markey, et al.. Timescale dependent sign of amorphous titanium dioxide thermo-optic coefficient. Optical Materials Express, 2023, 13 (10), pp.2882-2894. ⟨10.1364/ome.496559⟩. ⟨hal-04287458⟩
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