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Updated: May 8, 2026

Fabrication and Testing of Photonic Thermometers
Published on: October 24, 2018
Integrated temperature sensor based on an enhanced pyroelectric photonic crystal
Huihui Lu1, Benattou Sadani, Gwenn Ulliac
1Institut FEMTO-ST, UMR CNRS 6174, Université de Franche-Comté, 25030 Besançon, France.
Abstract:
In this paper, temperature variations are detected thanks to an enhanced nano-optical pyroelectric sensor. Sensing is obtained with the pyroelectric effect of lithium niobate (LN) in which, a suitable air-membrane photonic crystal cavity has been fabricated. The wavelength position of the cavity mode is tuned 11.5 nm for a temperature variation of only 32 °C. These results agree quite well with 3D-FDTD simulations that predict tunability of 12.5 nm for 32 °C. This photonic crystal temperature sensor shows a sensitivity of 0.359 nm/°C for an active length of only ~5.2 μm.
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