M3.2.3 - Hybrid Photonic-Plasmonic Waveguides (HPWG) for Hydrogen Sensing
- Event
- EUROSENSORS XXXVII
2025-09-07 - 2025-09-10
Wroclaw - Band
- Lectures
- Chapter
- M3.2 - MOEMS
- Author(s)
- R. Gremaud - ABB Switzerland Ltd, Baden-Dättwil, (Switzerland)
- Pages
- 94 - 95
- DOI
- 10.5162/EUROSENSORS2025/M3.2.3
- ISBN
- 978-3-910600-07-2
- Price
- free
Abstract
This contribution describes an HPWG structure, comprising a dielectric waveguide, a buffer layer anda metallic or semi-metallic sensing layer stack (metallic waveguide). By using the HPWG as a polari-zation selector, this layer stack works as a chemical sensor whose signal is independent of intensityvariations of the incoming light and is therefore optically self-calibrated. Hydrogenation of the sensinglayer stack changes its effective light absorption coefficient and/or refractive index upon changes ofthe hydrogen partial pressure in the environment. We demonstrate by modeling the optical responseof the HPWG that, by tuning the thickness of the buffer layer and the respective layers (materials com-position, thickness) of the sensor stack, it is possible to build optically self-calibrated HPWG structuresto be used as sensors for hydrogen.